Abstract: A wideband slot-loop antenna is described which comprises a generally planar loop element having a generally rectangular outer perimeter and a slot defining an inner perimeter, the mid portion of the slot-loop structure providing a major radiation portion of the antenna; a loading structure extending from one end of the slot, the loading structure for top loading the radiation portion; and an impedance matching portion for coupling a feed to the major radiation portion. The antenna also includes distributed matching patches. The distributed matching patches realize extra wideband performance. The antennas in the present invention are suitable for various wireless communications, such as PCS, Cellular Telephone, wireless data and computer network.

Abstract: An antenna system is installed on a wireless device which is designed to be placed near the ear of a human user. The antenna system has a first antenna configured to transmit and receive signals. The first antenna is located at the end of a boom. The boom rotates so as to displace the first antenna away from the user's head when wireless device is in use in close proximity to the user's head. In one embodiment, the system includes a monopole whip antenna and a switching mechanism to alternatively activate the monopole whip antenna and the first antenna.

Abstract: A PIFA structure has a first operating frequency and a second operating frequency. It comprises a planar radiating element (801, 1002, 1101, 1203) which is a conductive area confined by a substantially continuous border line divided by a non-conductive slot (802). The slot has a first end on said substantially continuous border line and a second end within the conductive area. The planar radiating element comprises a feedpoint (803, 1206) and ground contact (804, 1208) near the first end of the slot so that the electrical length of the conductive area divided by the slot, measured at the feedpoint, equals a quarter of the wavelength at the first operating frequency and the electrical length of the slot equals a quarter of the wavelength at the second operating frequency.

Abstract: An antenna unit transmit and receives radio signals having two different polarizations. The antenna unit includes a slot integrated in a microstrip element and an aperture integrated in a conductive surface on the microstrip element. The aperture is arranged in the conductive surface parallel to its polarization direction. The slot is arranged in an underlying layer directly below the aperture. The conductive surface of the microstrip element is arranged to transmit or receive with a vertical polarization and a first horizontal beam width. The slot is arranged to transmit or receive with a horizontal polarization and a second horizontal beam width. The second beam width is substantially equal to the first beam width. The antenna unit is very compact and light and only causes low power losses. A number of antenna units can be used to design sector antennas or antenna arrays.

Abstract: An antenna for providing a first antenna pattern at a first frequency of operation and a second antenna pattern at a second frequency of operation from first and second RF signals, respectively. The antenna included a horn which is dimensioned to generate the first antenna pattern from the first RF signal. A conduit is located within the horn and is configured to propagate the second RF signal in a waveguide mode. A corrugated rod having a first and a second portion is associated with the conduit. The first portion of the rod is located inside the conduit and the second portion of the rod protrudes from the conduit into the horn. The rod is configured to be responsive to the second RF signal and is operative to transition the second RF signal from a waveguide mode to a surface wave mode and propagate the second RF signal in a surface wave mode along the rod. The rod is configured to generate a second antenna from the second RF signal propagating in a surface wave mode.

Abstract: The present invention is for providing an antenna device in a portable radio, capable of transmitting and receiving in frequency bands used in two different communication systems without the performance irregularity even in the case of the mass production. By having the inductance per unit length along the elongating direction of the upper antenna element larger than that of the lower antenna element, the entire antenna element is resonated at a first frequency f1 as a quarter wave ground antenna element and is also resonated at a second frequency f2 lower than the frequency three times as much as the first frequency f1 as a three quarter wave ground antenna. Since the antenna element is formed with an antenna pattern printed on a printed wiring board, antenna elements with the same shape can be obtained, and thus the antenna performance irregularity cannot be generated even in the case of the mass production.

Abstract: An antenna for receiving signals from GPS and GSM comprises a cylindrical body formed of dielectric material, an axial central through hole, a first conductor layer coated on the bore of the through hole, a ground conductor layer coated on the bottom of the body being in contact with the first conductor layer, an insulator fitted into the through hole, a feeding pin provided in the center of the insulator with both ends extended above the top and the bottom of the body wherein the end atop the body being attached to a helical antenna, and a patch antenna formed on the circumferential surface of the body such that the antenna can receive signals from GPS and GSM respectively. This greatly reduces the size of antenna as well as reduces the manufacturing and transporting costs.

Abstract: A multi-mode, common-aperture antenna system capable of simultaneously transmitting and/or receiving electromagnetic radiation in at least two frequency bands. The antenna system includes a first beam antenna comprised of a parabolic reflector and four open-ended waveguides that act as an antenna feed. The parabolic reflector focuses radiation along a first beam axis that may be scanned electronically or mechanically. The four waveguides extend from the focus of the parabolic reflector to transceivers that transmit and/or receive radiation in a first mode. The transceivers mount at the rear of the reflector. The antenna system also includes a second beam antenna which operates in a second mode, e.g. optical or infrared (IR) mode. The second beam antenna includes a small opening in the parabolic reflector that acts as an optical aperture for a focusing lens mounted at the rear of the reflector and positioned coaxially with the small opening. An optical apparatus occupies the focal plane of the focusing lens.

Abstract: Antenna systems for use within wireless communication devices such as radiotelephones are provided and include an internal multi-frequency band antenna and an elongated antenna member that is retractable. The elongated antenna member is extendible from the housing of a communications device so as to have an extended position and a retracted position. The elongated antenna member includes an elongated conductive element that is capacitively coupled with the multi-frequency band antenna when the elongated antenna member is in the extended position. The multi-frequency band antenna is electrically isolated from the elongated conductive element when the elongated antenna member is in the retracted position. When the elongated antenna member is in an extended position, the elongated conductive element is configured to resonate as a half-wave monopole antenna when the internal antenna resonates within a first frequency band.

Abstract: The invention relates to a mobile antenna for a plurality of radio services in the form of a dipole or monopole, with an antenna conductor and with at least one flatly designed roof capacity disposed substantially vertical relative to the antenna conductor for a first radio service with polarization disposed vertically relative to the roof capacity. The roof capacity is designed in the form of a conductive board or a thin conductive layer. In order to create an antenna function for at least one additional radio service with polarization oriented parallel with the roof capacitance, at least one slot is incorporated in the conductive board or layer with the slot length selected to form a suitable impedance bandwidth. In order to decouple signals of an additional radio service, first and second connection points are formed on the edges of the slot, wherein the connecting points oppose each other.

Abstract: A transmitter is provided in a base station which communicates with a mobile station of a high-speed communication user and a mobile station of a low-speed communication user according to a spread spectrum system. The transmitter includes a first antenna having a wide directivity, a second antenna having a directivity narrower than that of the first antenna, a first transmission unit for transmitting a first transmission signal from the first and second antennas to the mobile station of the low-speed communication user, and a second transmission unit for transmitting a second transmission signal from the second antenna to the mobile station of the high-speed communication user.

Abstract: A radio antenna is disclosed with improvement in a radiation efficiency obtained by changing a directivity pattern of an antenna toward a direction not interfered by an obstacle and thus reducing radio wave interference by the obstacle. A whip antenna is connected to a transceiver unit in a radio set housing through a feeder line. A passive element is grounded to the radio set housing through a load impedance element. The whip antenna changes the horizontal directivity pattern in dependence upon the electromagnetic coupling with the passive element. The passive element operates as a wave director or a reflector for the whip antenna in accordance with the value of the load impedance element. When the passive element operates as a wave director, the radiation becomes much stronger in the direction toward the passive element. On the other hand, when the passive element operates as a reflector, the radiation in the direction away from the passive element becomes much stronger.

Abstract: A dual band antenna for a radio terminal consists of a retractable whip antenna and a helical antenna with irregular pitches, wherein the whip antenna is independent of the helical antenna. The helical antenna includes first and second helical portions having first and second pitches, respectively and the first and second helical portions are operable at different frequency bands independently. The whip antenna includes a conductive core line, a conductive substance covering a first portion of the conductive core line to serve as a choke and an isolation element extending from an upper end of the conductive core line, for filling a gap between the conductive core line and the conductive substance. Here, only the first portion of the conductive core line is operable at a first frequency band and the entire conductive core line is operable at a second frequency. A fixing element fixes the helical antenna and the whip antenna to the radio terminal.

Abstract: A multiple frequency band antenna for a communications device, such as a radiotelephone, includes a dielectric substrate having high and low frequency band radiating elements disposed on a surface thereof. The high and low frequency band radiating elements have meandering patterns and are electrically connected to a feed point. Lumped electrical elements are electrically connected in series between the high and low frequency band radiating elements at the feed point to reduce coupling effects between the high and low frequency band radiating elements.

Abstract: In an antenna assembly (10) including a whip antenna (1, 9) provided with a stopper (5) of a conductive material at a lower end of the whip antenna, a helical antenna (2) provided with a conductive sleeve (6) mounted on a top end of the whip antenna, and a holder (4) of a conductive material for slidably holding the whip antenna, each of the stopper, the conductive sleeve, and the holder is of a light metal having a specific gravity not greater than 3 g/cm3. The holder is electrically connected to the stopper when the whip antenna is in an extended position. The holder is electrically connected to the conductive sleeve when the whip antenna is in a retracted position. The light metal may includes at least one of aluminum and magnesium. Alternatively, the light metal essentially consists of 0.4% or less Si, 0.7% or less Fe, 5.0-6.0% Cu, 0.30% or less Zn, 0.2-0.6% Bi, 0.2-0.6% Pb, and the balance Al in weight.

Abstract: An automatic antenna for a multiband mobile communication terminal. The automatic antenna comprises a microstrip antenna mounted on an upper part of a housing of the mobile communication terminal, the microstrip antenna having at least two microstrip line parts for different frequency signals; a motor with a toothed wheel mounted on a shaft thereof; a whip antenna having sawteeth formed on a side thereof, wherein the sawteeth are engaged with the toothed wheel to extend and retract the whip antenna by a rotation force of the motor; a feeder electrically connected to a main board of the mobile communication terminal and the microstrip antenna, the feeder being electrically connected to the whip antenna by coupling effect; an insulating tube along which the whip antenna is movable, for preventing antenna radiation of the whip antenna; and an antenna support for supporting the whip antenna.

Abstract: An integrated dual-mode antenna including a quadrifilar antenna and a collocated monopole antenna. The integrated antenna is compact and unencumbered by signal blockage or isolation problems.

Abstract: A linear antenna, such as a monopole antenna, is placed in the axis of a circular polarized antenna, such as a printed patch antenna or a helical antenna. The linear antenna can be optimized for a terrestrial communication system while the circular polarized antenna can be optimized for a satellite system.

Abstract: The invention provides An antenna device, comprising: a substrate made of an insulation material and including a first major surface and a second major surface face; a ground electrode provided substantially on the whole of the first major surface of said substrate; and an inverted F-shape antenna and a microstrip antenna respectively provided on the surface of the substrate. An open end of a radiation electrode of the microstrip antenna and a feeding electrode of the inverted F-shape antenna are capacitively coupled to each other. A first direction through the open end and ground end of the radiation electrode of the inverted F-shape antenna is substantially perpendicular to a second direction through the open end and ground end of the radiation electrode of the microstrip antenna. By the above arrangement, a mutual interference hardly occurs between the two antennas.

Abstract: A dielectric resonator antenna having a resonator formed from a dielectric material mounted on a ground plane. The ground plane is formed from a conductive material. First and second probes are electrically coupled to the resonator for providing first and second signals, respectively, to or receiving from the resonator. The first and second probes are spaced apart from each other. The first and second probes are formed of conductive strips that are electrically connected to the perimeter of the resonator and are substantially orthogonal with respect to the ground plane. The first and second signals have equal amplitude, but 90 degrees phase difference with respect to each other, to produce a circularly polarized radiation pattern. A dual band antenna can be constructed by positioning and connecting two dielectric resonator antennas together. Each resonator in the dual band configuration resonates at a particular frequency, thereby providing dual band operation.

Abstract: An antenna construction comprises a feed conductor (11, 21) and an antenna element (12, 22, 24, 25, 26, 27) which has a first end and a second end. The feed conductor is substantially electrically unshielded and coupled to the antenna element at a tapping point (13, 23) located between the first end and second end of the antenna element the tapping point dividing the antenna element into two portions having unequal electrical lengths. The antenna element may be a helix (12), a whip (22) or another known two-ended antenna element or a combination of those.

Abstract: A multiport beamforming antenna provides multidirectional beam patterns with minimum interference comprising multiple, as for example twelve, radiating elements mounted on a conducting ground plane. Multiple, for example six, reflecting surfaces, each having a shape of one quarter of a circle or an ellipse, are radially disposed about the center of a round ground plane conductor to give a hemispherical shape with multiple, for example six, equal sectors. Each sector of the multiport antenna contains two types of radiating elements mounted adjacent to the corner of the reflector. The first elemental antenna is responsive to energy having a first polarization, while the second elemental antenna is responsive to energy having a polarization orthogonal to the first polarization. With such an arrangement, all the radiating elements are located in close proximity without coupling signals to each other, and each element is capable of producing a directional radiation pattern in an independent manner.

Abstract: An antenna assembly is disclosed that comprises a terrestrial antenna and a support that mounts the antenna assembly on a satellite dish antenna. The satellite dish antenna has a convex/concave configuration, a periphery, a front signal receiving surface. The terrestrial antenna comprises a pair of dipoles. A power amplifier has an input connected to the terrestrial antenna to receive and amplify its terrestrial video signal. A diplexer is further provided and has first and second input terminals and an output terminal. The second input terminal is connected to the power amplifier to receive the amplified terrestrial video signal. The first input terminal is adapted to be connected to the satellite dish to receive the satellite video signal. The diplexer operates to sum the amplified terrestrial signal and the satellite video signal to provide an aggregate signal to the output terminal.

Abstract: The present disclosure is related to an antenna (129) adapted to receive signals in multiple frequency bands, and comprises a fixed whip antenna (406) and a helical coil antenna (408) coupled to a single feedpoint. The antenna may also include a monopole common to the fixed whip antenna and the helical coil antenna. A single matching circuit (130) is adapted to provide matching for both the whip antenna and the helical coil antenna. According to one embodiment, the antenna can also be reduced in size by attaching a disc (704) to the end of the whip portion of the antenna, while decreasing the pitch of the helical coil. Finally, a clip (210) can be used below a threaded nut of a housing to provide a feed point for the antenna to further reduce the electrical lengths of the fixed whip antenna and a helical coil antenna.

Abstract: A conformable, integrated antenna assembly providing three or more radiating apertures in a single antenna structure is provided. The antenna assembly is adapted to mount flush with the fuselage or other surface of an aircraft or other structure. A range of antenna services, including communications, navigation and IFF (CNI) services, may thus be provided while simultaneously minimizing aerodynamic drag and reducing size, weight and cost.

Abstract: Improved antennas and antenna systems for use in cellular and other wireless communications systems. A folded mono-bow antenna element is provided which has a substantially omnidirectional radiation pattern in a horizontal plane and shows variation in gain in an elevation plane depending upon the size of an associated ground plane. The folded mono-bow antenna element comprises a main bowtie radiating element and parasitic element wherein the main bowtie radiating element and parasitic element are separated by a dielectric material having a dielectric constant preferably less than 4.5 and, in some cases, less than or equal to 3.3. Various antenna arrays and methods of making the same are also provided.

Abstract: An antenna device for a radio communication apparatus. The antenna device includes a rod antenna and a helical antenna, both of which are connectable to a transceiver. The helical antenna has an active state for receiving an emitting electromagnetic energy, and a passive state. The helical antenna is transferable from the active state to the passive state by axial compression. Preferably, the helical antenna is axially compressed into the passive state when the rod antenna is moved to an active position.

Abstract: A local television antenna system for use with a satellite television system includes an omnidirectional antenna, a support structure for mounting the omnidirectional antenna to a satellite television dish support, and receiving circuitry mounted to the omnidirectional antenna. The omnidirectional antenna includes an antenna plate, having electrical circuit paths formed thereon, and first and second antennas having curled ends. The support structure includes a integrally-molded double clamp for providing a mechanically strong coupling to the satellite television dish support and first and second brackets for mounting to the omnidirectional antenna to provide a mechanically strong coupling. The receiving circuitry is shielded to limit interference and includes filter and amplification circuitry and one or more diplexers for combining a received local television signal with a received satellite television signal.

Abstract: The diversity antenna circuit comprises a first antenna for receiving a vertical plane of polarization of an electric wave, a second antenna for receiving a horizontal plane of polarization thereof, a receiving means for detecting the electric field strength of a received signal, a first matching means for matching the first antenna to the receiving means, a second matching means for matching the second antenna to the receiving means, a first transfer means, a second transfer means, a first switching means, a second switching means, and a switching control means for connecting one of the first and second antennas to the receiving means and separating another one from the receiving means according to ON/OFF control of the first and second switching means based on received electric field strength.

Abstract: An antenna module suitable for use with a radio telephone is disclosed. The antenna module 200 comprises an antenna 132, suitably multifilar configuration, and a support 118 which supports the antenna. The support also supports a filter 128, 124 which is electrically coupled to the antenna, and an amplifier 124 electrically coupled to the filter. The amplifier is non-fixedly coupled to radio circuitry housed within a radio housing 102. Typically, the antenna module can be non-fixedly coupled to the radio housing.

Abstract: An antenna dish for reflecting signals for a first antenna operating in a first frequency band is mounted in proximity to a second antenna operating in a second frequency band separated from the first band. With the two antennas in certain relative orientations, the dish is partially or totally in the receiving and transmitting path of the second antenna. The dish is modified so that signals in the first frequency band can effectively pass through the dish. This end result is achieved by placing conductive antenna elements over the entire reflecting surface, these elements being dimensioned to efficiently radiate and receive signals in the first frequency band, thereby permitting such signals to effectively pass through the reflector dish.

Abstract: An electromagnetic probe for the detection of both E-field and H-field radiation includes a quasi-isotropic E-field antenna and a quasi-isotropic H-field antenna. The quasi-isotropic E-field antenna includes three mutually orthogonal surface area antenna elements which define three mutually perpendicular planes and an apex. Each surface area element is responsive to E-field radiation normal to the surface of that element and produces an output voltage signal proportional thereto. The quasi-isotropic H-field antenna includes three mutually orthogonal electrically small loop antenna elements. Each loop antenna element is responsive to H-field radiation which is incident normal to the plane of the element. Each loop antenna element produces an output voltage signal proportional to the field strength of the H-field radiation. The H-field antenna is affixed substantially proximate to the apex which is defined by the E-field antenna.

Abstract: A device for connecting an external antenna to at least one transmitting and/or receiving unit provided in a motor vehicle, the external antenna being connected via an antenna connection that has been passed through a first orifice in the vehicle body to an antenna cable linked to the at least one transmitting and/or receiving unit and being secured with anti-rotation locking to the vehicle body by a plug passed through a second orifice in the vehicle body, to render possible the connection of an additional transmitting and/or receiving device to the antenna. The plug is configured to accommodate a plug-in connection connected to the antenna. The plug-in connection is connectible to the mating connector of an antenna cable linked to at least one further transmitting and/or receiving unit.

Abstract: A broadband antenna, including a centrally-positioned radiating element, a dielectric support element generally surrounding the centrally-positioned element, and a linear radiating element, which extends along at least part of the length of the centrally-positioned element and a portion of which is wound over the support element around the centrally-positioned element. The centrally-positioned element preferably includes a linear metallic radiator, and the linear radiating element preferably includes a wire, such that the portion of the wire that is wound over the support element defines a helical radiator.

Abstract: An antenna assembly is disclosed that comprises a terrestrial antenna and a support that mounts the antenna assembly on a satellite dish antenna. The satellite dish antenna has a convex/concave configuration, a periphery, a front signal receiving surface. The terrestrial antenna comprises a pair of dipoles. The support comprising a pair of sleeves for readily receiving and supporting the pair of dipoles respectively in a substantially parallel relationship to each other, and a support variably mounting the terrestrial antenna on the satellite dish antennas of varying size and configuration.

Abstract: The present invention is directed to an unfocused optical sensor including a dual mode optical and radio frequency (RF) sensor system for use with a guidance system of a munition. The inventive system comprises an optical sensor comprising a plurality of optical detector units. The optical detector units each produce an optical detector output signal upon illumination with optical energy. In a dual mode embodiment, the sensor may further comprise an optional rf sensor which produces an rf sensor output signal. In the case of the dual mode sensor, the optical detector units are arranged in an annulus mounted coaxially with the transreflector and twist reflector about the longitudinal axis of the munition. The sensor system further comprises a signal processor operably associated with the optional rf sensor and the optical sensor to receive the rf sensor and optical detector output signals and provide a guidance signal to the guidance system.

Abstract: A receiver for a spectrum spread communication system capable of eliminating a deterioration in receive quality due to fading by multipass. A signal of which a spectrum is spread by a direct spread modulation system is transmitted from a transmit side unit. A receive side unit is provided with a plurality of receive antennas, through which receive signals are fed to receiver circuits, followed by conversion of each of the signals into an intermediate frequency signal. Then, the signal is fed to a signal intensity measurement circuit and sampled by a clock n (n: an integer) times as high as a chip frequency, resulting in an intensity thereof being measured. Depending on results of the measurement, a selection signal is fed to a path switching circuit, resulting in one of outputs of the receiver circuits being selected, which is then fed to a direct spread demodulation circuit.

Abstract: A wireless subscriber terminal having an improved performance is disclosed. The terminal 12 comprises: a quarter wavelength monopole first antenna 14; a folded monopole second antenna; and a ground plane having a surface 18 angled with respect to the horizontal, wherein the ground plane has an axis a quarter of a wavelength long extending from a feed point for the first antenna and is electrically symmetrical about the axis. Mutual coupling effects between the first antenna and the second antenna are reduced. A method of operation is also disclosed.

Abstract: A combination antenna has two antenna parts (8; 9, 9a, 17) and a connector part (10) to connect them to a radio apparatus. The first antenna part is a whip antenna and the second antenna part comprises a planar surface and a conductive pattern (16) formed on it to transmit and receive radio-frequency radiation. When the antenna parts are mechanically coupled to the connector part the plane surface, which includes a radiating conductive pattern, is separated from said first antenna part. In addition, the second antenna part or another part of the construction may include a plane surface with a plating on it, which in the normal operating position protects the user's head from radiation.

Abstract: An RF antenna system is disclosed having at least one meandering antenna line with an aggregate structure formed to substantially extend in two dimensions, to effectively form a top-loaded monopole antenna. The meandering antenna line includes at least one localized bend for providing a compressed effective antenna length in a compact package. The present antenna can be made as an antenna system having discrete transmit and receive antenna lines, so as to form a dual antenna system. The localized bends on each line electromagnetically couple with the respective bends on the other line, thus increasing electromagnetic coupling efficiency, thereby increasing antenna bandwidth and gain.

Abstract: An antenna for a motor vehicle provides both global positioning system and radio functionality. The antenna, which may be connected to a typical radio antenna body opening, may include a tubular portion which receives AM/FM radio signals and a planar member secured on top of the AM/FM radio antenna. The planar member may be for example, an active element for a global positioning system antenna and may be connected to a global positioning system receiver by wires that extend from the global positioning system antenna through the radio antenna to the global positioning system receive.

Abstract: A replaceable battery cover can be detachably mounted on a battery storage portion formed in the housing of mobile terminal equipment. A linear or plate-like antenna conductor having an antenna element pattern is joined to the inner surface of the battery cover by using one of joining means including embedding, boding, welding, and fitting means. The battery cover is mounted on the storage portion to electrically connect the antenna conductor to a radio circuit in the housing. In this case, by changing the arrangement of the antenna conductor, the antenna can be replaced with a loop antenna, a zigzag antenna, a helical antenna, or a microstrip antenna in accordance with a specific battery cover. In addition, the device may have an external antenna connection terminal to which an external antenna can be connected or an external interface section.

Abstract: A multiple use, multi-band antenna for mobile wireless communication and global positioning has includes a elongated cellular radiating element and a GPS radiating element supported atop the cellular radiating element. The cellular radiating element has a continuous body portion of varying diameter that forms a flared upper portion which supports a global positioning system amplifier mounted thereon. The GPS amplifier unit takes the form of a GPS patch radiator disposed atop a low noise amplifier. The cellular and GPS radiating elements are fed by respective first and second feedlines. The stacking of the GPS amplifier unit on the cellular radiating element provides a top loading effect for the cellular radiating element that enables it to resonate across all pertinent cellular frequencies.

Abstract: An antenna structure for two frequency ranges including two antenna elements. The first antenna element is a cylindrical coil conductor (2) forming a helical antenna and includes in the direction of its longitudinal axis, a first portion (2a) and a second portion (2b). The second antenna element (3; 6) is connected to the cylindrical coil conductor by a fixed connection at a junction (2c) lying between the first and second portions of the first antenna element. The second antenna element may be for example, a filamentous conductor (5a), a conductive pattern (5) formed on the surface of an insulating plate (3), or a small-diameter helical antenna (6). The first operating frequency is dependent on the combined electrical length of the portions of the first antenna element while the second operating frequency is dependent on the combined electrical length of the lower part of the first antenna element and the second antenna element.

Abstract: A microstrip plane antenna and a helical antenna are arranged substantially in line therewith. A base conductor of the microstrip plane antenna is electrically coupled with the helical antenna, thereby allowing stable communications with a orbiting communications satellite in the sky.

Abstract: A disk antenna (10) has a base (12). The disk antenna (10) further has a hollow post (14) which is securely fastened at a bottom distal end to the base extending upwardly therefrom. The post (14) has a post base (14A). The post base (14A) is securely connected at a bottom distal end to the base (12) and rotatably connected at a top distal end to a bottom distal end of a post head swivel (14BA) which is rotatably connected at a top distal end to a bottom distal end of a post head (14B) which is securely connected at a top distal end to the dish (16). The disk antenna (10) further has a dish (16). The dish (16) has a dish plate (16A) having a dish cone (16B) centrally located therein. The dish (16) is securely attached to a top distal end of the post (14). The disk antenna (10) further has a primary antenna (18A) which is securely fastened to the dish (16).

Abstract: An integrated antenna system for satellite and VHF/UHF reception is provided. The elements of a VHF/UHF antenna are embedded in a satellite antenna. The satellite and VHF/UHF signals are combined and transmitted on a single cable to the receiver. The receiver splits the signals. A switch within the receiver unit for displaying either the VHF/UHF or satellite transmissions is provided. The receiver also powers amplifiers at the antenna using the single cable.

Abstract: The invention relates to a particular structure of high-frequency antenna, which comprises a support element (1) provided with a cylindrical coil conductor which forms a helix (2). On the support element (1) there is formed, for example by means of a conductive coating, the electrical parts of the antenna, such as the attachment points (3b) for the helix and for other parts, such as feeder lines (4), radiators (5) or impedance matching devices. By varying the number and size of the helices (2), the number and form of the feeder lines (4) and radiators (5) and the quality of any impedance matching devices, it is possible without difficulty to obtain a very wide choice of different antenna structures. The feeder lines and radiators extend, at least in part, within the helix.

Abstract: A difference drive diversity antenna structure (200) and method for a portable wireless communication device (230) aligns a first linear antenna (240) parallel to a major axis (245) of the communication device and drives dual radiators (252, 254) of a second antenna (250) at equal magnitudes but with a 180 degree phase difference. A difference drive diversity antenna structure implemented in a portable wireless communication device maintains significant decorrelation between the first antenna (240) and the second antenna (250) over the common frequency ranges of the dual radiators (252, 254). Also, antenna currents on the body of the communication device are minimized and the effects of a hand or body near the communication device are reduced.

Abstract: A combination satellite television signal receiving antenna and a UHF/VHF antenna, particularly suitable for use with recreational vehicles. The satellite antenna is mounted for both horizontal and vertical adjustment having a circular periphery and the UHF/VHF dipole antenna is attached thereto and is of an arcuate configuration defining a portion of a circle concentric to the satellite receiving antenna dish configuration. The television and UHF/VHF antenna are mounted for simultaneous adjustment.