Abstract: The present invention relates to an internal antenna for a handset and a design method thereof. The present invention provides an internal antenna for a handset and a design method thereof characterized in that a L/C element is attached to a slot line of an internal antenna, the attached L/C element is moved along the slot line, or the L/C element having a predetermined inductance/capacitance is attached and detached, thereby easily matching a resonant frequency.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Multiple feed points may be provided between the wireless communication device and the slot.

Abstract: There is disclosed an antenna having a tapered radiating element possessing a slow-wave structure along a tapered radiating edge thereof. The radiating element is combined with a ground plane conductor to form a monopole antenna. The slow-wave structure supports an increased antenna operating bandwidth and reduced aperture clutter by being shaped to increase the radiative rate of loss of energy from signals propagating along the slow-wave structure. A log-periodic distribution in the shaping of serrations within the slow-wave structure provides substantially frequency-independent performance across the bandwidth.

Abstract: An antenna device (60) is provided that is used in a recorder and/or writer destined for writing and reading data to and from a contactless IC card (1). The antenna device (60) includes a loop coil (61) that radiates a magnetic field, magnetically couples with a loop coil (4) provided in the IC card (1), and sends and receives data to and from the IC card (1). The loop coil (61) is formed asymmetric for the winding sections thereof opposite to each other across the center of the loop coil (61) to be different in interval from each other.

Abstract: Disclosed is a wireless internal antenna for a home network and digital electric home appliance which comprises: a wireless antenna for a client having a tuning slot at an upper surface of a client device to realize an impedance matching at a band of IEEE802.11b (a band of 2.4 GHz) and having a certain type patch pole at a lower surface of the client device to have return characteristics at a band of IEEE802.11a (a band of 5 GHz); and a wireless antenna for a server, enabling transmission/reception to/from the client device, having an air slot at an upper surface of a server device and a feeding line at a lower surface thereof, and the server device is supported at a ground plate by a supporting portion installed at a lower part thereof.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area. Slotted cables serve as antennas. According to the invention, a first slotted cable is arranged as a transmitting an antenna (4) for transmitting a pulsed high-frequency signal and a second slotted cable is arranged as a receiving antenna (9) for receiving the reflected signal. The slotted cables are arranged in association with each other and essentially parallel to each other, and the transmitter unit (2) is connected to the first slotted cable at one end of the antenna arrangement and the receiver unit (3) is connected to the second slotted cable at the other end of the antenna arrangement.

Abstract: An antenna device has a circular radiation plate with a diameter of substantially ½ wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The power supply ports are disposed at positions where straight lines connecting respective power supply ports to a midpoint of the radiation plate intersect at right angles. Four slits axisymmetric with respect the straight lines are disposed in radiation plate, and two sides of the periphery of each slit contact with each other.

Abstract: In the event of the shipment of electronic tags from a manufacturer to a customer, a number of the electronic tags required by the customer are adhered to a double-faced adhesive tape and then the double-faced adhesive tape is wound on a reel. Then, this reel is contained in a case and shipped to the customer. The electronic tag is adhered to an article in the following manner. That is, the double-faced adhesive tape is cut to obtain pieces of the electronic tags, and the cover tape on the rear surface of the double-faced adhesive tape is peeled, and then, the electronic tag is adhered to the article by the use of the double-faced adhesive tape.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Multiple feed points may be provided between the wireless communication device and the slot.

Abstract: An antenna arrangement comprises a patch conductor (102) supported substantially parallel to a ground plane (104). The patch conductor includes first (106) and second (108) connection points, for connection to radio circuitry, and further incorporates a slot (202) between the first and second points. The antenna can be operated in a plurality of modes by variations in the impedances connected to the first and second points. For example, if signals are fed to the first point (106) then a high frequency antenna is obtained by connecting the second point (108) to ground and a low frequency antenna by leaving the second point (108) open circuit. A wide range of embodiments having alternative connection arrangements are possible.

Abstract: A wireless communication device and method for identifying a container or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container, using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming a rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Variable impedance matching is provided between the wireless communication device and the slot.

Abstract: The disclosure relates to an antenna. To improve transmission and reception in a mobile telephone, it has what is termed a diversity antenna. The invention relates to an antenna suitable as a diversity antenna. The antenna has a plate of insulating material with a foil coating on both sides. In the foil there are provided two slots, one on each side. The slots have meander formations or windings in order that their electric length exceed their physical length. The one slot is 1-3 % longer than the other. At one closed end of the one slot, there are connections for a supply line. The foil coatings are in contact with one another through a plate which is soldered fast on the side of the carrier at right angles thereto. Laterally in relation to the longitudinal direction of the slots, there is an earth plane. The foil coatings extend out on this, and both sides are in galvanic communication with one another. In order to increase the electric length of the earth plane, slots are provided in the foil coatings.

Abstract: A stacked patch antenna comprising two metallic patches (210, 240) stacked on top of each other. The middle patch (210) comprises at least two conductors (224, 234) at or close to its edge (212), which conductors are intended to be connected to a ground plane (200) to thereby ground the patch in two places. The top patch (240) comprises at least two conductors (254, 264) at or close to its edge (242) which electrically interconnect the two patches. The middle patch is fed at a feed area (219) which is at least proximate its geometric center. The middle patch further comprises at least two apertures (220, 230) completely within its circumference (212), i.e. each aperture having a respective unbroken circumference (232, 242). Thereby enabling radiation from slots (214, 216, 244, 246) defined by the edge of the top patch and the edge of the middle patch and defined by the edge of the middle patch and the ground plane.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Multiple feed points may be provided between the wireless communication device and the slot.

Abstract: An internal multi-band antenna (10) for a mobile communication devices having a planar radiating element (12) and a ground plane conductor (14) disposed substantially parallel thereto with a dielectric (16) such as air or a substrate therebetween. The radiating element (12) includes at a feed point, for example, a feeding strap (18), which may have an L-shape. One or more shorting straps (20, 22) are selectively connected between the radiating element (12) and the ground conductor (14), positioned relative to the feed point for tuning the input impedance at the feed point, and for tuning the resonant frequency of the planar radiating element (12). The radiating element includes an angled slot (26) having at least three slot sections, for example, N, M, W shapes and the like, mutually coupled at a second resonant frequency to increase resonant frequency bandwidth. The feeding strap (18) and one or more shorting straps may be provided as inverted L straps (30) for a series LC impedance.

Abstract: A multiband PIFA (planar inverted-F) antenna. A preferred embodiment makes use of a spiral slot. The spiral slot is formed to cause multiple frequency dependent nulls in the antenna's electric field modal distribution. The preferred embodiment antenna has a single element patch radiator formed on a dielectric support in an inverted-F relationship with a first ground plane. The dielectric support may be part of a device housing or internal board, e.g., a PCB board. The patch radiator includes a spiral slot. A feed is made to the single element patch radiator in a location relative to the spiral slot to ensure that portions of the single element patch radiator enclosed by the spiral slot are fed as a series extension of another portion of said patch radiator. According to a preferred embodiment, the patch radiator may be formed from a single conductive sheet, plating or deposit along with the shorting post and feed.

Abstract: A dielectric plate, serving as a 90-degree phase device, is disposed inside a waveguide. A phase-converting portion of uniform thickness is formed at the central portion of the dielectric plate, and stepped portions, serving as impedance converting portions, are formed at both longitudinal end portions of the phase converting portion by causing protrusions to be protrude from both of the longitudinal end portions. The protrusions are disposed on orthogonal axes extending in widthwise and thickness directions of the dielectric plate. With respect to a width W1 and a thickness T1 of the central portion of the dielectric plate, a width W2 and a thickness T2 of each of the protrusions are such that W2<W1 and T2<T1, respectively. When the protruding amount (height) of each of the protrusions from end surfaces of the phase converting portion is represented by H, H is approximately ¼ of a wavelength &lgr;g inside the waveguide.

Abstract: An antenna for a radio communications apparatus operates in the frequency range of 800 MHz-3 GHz. The antenna has two radiating elements. The first radiating element is a slot in a substantially planar foil or disc-shaped metallic conductor. The second radiating element has a resonance frequency which is different from that of the first radiating element. The metallic conductor is placed close to a second conductor in the form of a metallic surface. The second radiating element is formed from an edge portion of the first conductor or a gap between the first and the second conductors. Capacitance devices may be disposed between the edge portion and the second conductor.

Abstract: A method and system for transmitting, and a signal comprising multiple frequency bands from a single slot antenna are disclosed. The system comprises a slot antenna and a micro-electro-mechanical (MEM) switch, coupled to the slot antenna. The MEM switch is opened and closed, thereby changing the resonant frequency of the slot antenna. The slot antenna transmits a first frequency when the MEM switch is open and a second frequency when the MEM switch is closed. The method for transmitting a first frequency and a second frequency from a slot antenna comprises the steps of transmitting the first frequency from the slot antenna, closing a micro-electro-mechanical (MEM) switch coupled across the slot antenna, therein changing the resonant frequency of the slot antenna, and transmitting the second frequency from the slot antenna after the MEM switch is closed.

Abstract: A personal communications terminal includes a telephone unit and an application processing unit that are operatively connected. The telephone unit includes a first RF transceiver for communicating with a cellular communications network via an external dipole antenna. The application processing unit includes a short range transceiver and antenna for connecting the computing device with an external computer or local area network. The short range antenna is a slot antenna formed by a slot in the housing of the personal communications terminal.

Abstract: In a coaxial resonant slot antenna including a flat rectangular conductive box having its top plate with a slot being defined therein, and a strip conductor disposed inside the box and electrically insulated from the box while high frequency or RF power is fed to the strip, an island conductor is provided in the slot for defining a capacitance between itself and the frame, which capacitance is rendered variable in value by use of a variable capacitance circuit.

Abstract: A coaxial resonant slot antenna includes a flat rectangular conductive box having its top plate with a slot being defined therein, and a strip conductor disposed inside the box and electrically insulated from the box while high frequency or RF power is fed to the strip. An island conductor is provided in the slot for defining a capacitance between itself and the frame. This capacitance is rendered variable in value by use of a variable circuit.

Abstract: In order to offer a tunable slot antenna capable of varying an impedance matching center frequency thereof, there is provided a coaxial resonant slot antenna for supplying RF power to a strip conductor placed in a flat conductive cubic with a slot formed in its upper surface and electrically insulated from the flat conductive cubic, wherein a variable capacitor is electrically connected between one point lying in the neighborhood thereof including an end far from a RF power connection point on the strip conductor and a side wall of the flat conductive cubic, and a d.c. voltage to be applied across the variable capacitor is supplied to the connection point.

Abstract: The invention provides a small portable radio apparatus including a slot antenna member. The slot antenna member has an improved form disposed in a casing. The casing has a curvedly bulging side edge surface. Thus, there is no useless space in the casing reducing the size of the portable radio apparatus. The slot antenna member has first and second conductive plates which form a slot groove at an outer peripheral edge of the first and second conductive plates. A short-circuiting element short-circuits the conductive plates with each other over the slot groove. A tuning capacitor element is connected to the first and second conductive plates at a position opposite to a position where the short-circuiting element is provided. The radio apparatus casing has a side portion which curvedly bulges toward an outer periphery thereof. The first and second conductive plates have central portions with openings and side portions which bulge slantingly toward outer peripheral edges thereof.

Abstract: An electrically-short meandered-slot antenna having a plurality of switch-selected resonant frequencies is described. Meander slot sections are substantially parallel, closely coupled, electrically significant, and substantially equal in length to the overall monopole length of the antenna. Switching among resonant frequencies is accomplished with shunt switches across the antenna slot, the switches preferably being powered inductively and selectively at individual frequencies outside the operating band of the antenna.

Abstract: A dual frequency cavity backed slot antenna and method of tuning the antenna, wherein the antenna comprises a plurality of stacked layers including a layer having a substrate with an accessible surface, the surface including thereon a continuous slot, first electrically conductive metallization disposed within the slot and extending to the slot, second electrically conductive metallization disposed external to the slot and at least one pair of frequency adjusting tabs, one tab coupled to the first metallization and the other tab coupled to the second metallization. The tabs are electrically conductive metallization, the tab coupled to said first metallization extending outwardly toward the second metallization and the tab coupled to the second metallization extending inwardly toward the first metallization. A slot is provided between the tab coupled to the second metallization and the second metallization. Each tab of a pair is coaxial with the other tab of the pair and symmetrical about the axis.

Abstract: An RF identification system having an interrogator operable to send RF interrogations to a transponder and to receive RF responses from the transponder. The interrogator is in electrical communication with a closed slot antenna. The closed slot antenna is formed by an an outer virtual magnetic loop and an inner virtual magnetic loop such that the antenna has a superior magnetic field when compared to a balanced double loop antenna with an equal area and a superior far-field noise suppression when compared to the single loop antenna. The antenna receives said RF responses from the transponder and provides said RF responses to said interrogator. Other devices, systems and methods are also disclosed.

Abstract: An inexpensive, efficient, broadband, slot-type antenna with unidirectional sensitivity includes a slot-forming means defining a plurality of substantially concentric and generally coplanar annular slots and a non-resonant antenna connection means for transmitting electromagnetic energy to and from the plurality of annular slots. The antenna connection means forms a plurality of non-resonant, radially-extending cavities that are adapted to combine electromagnetic energy received at a plurality of concentric annular slots for transmission from the slots generally in phase and along the central slot axis that lies perpendicular to the two concentric annular coplanar slots. The antenna may also include a plurality of impedance-forming portions distributed around the periphery of at least one or two of the substantially concentric annular slots to enhance both left-handed and right-handed circular polarization, to provide dual linear polarization, and enhance the unidirectional sensitivity of the antenna.

Abstract: An electromagnetic field is produced by an oscillating magnetic frill that is generated at a slot gap in a resonating toroidal cavity. The magnetic frill's generating structure is physically small in relationship to its operating wavelength. Due to its small size relationship, the structure would be classified as a small antenna. The internal placement of inductance or capacitance allows the ability to raise or lower the resonant frequency of the structure. The structure's function can be changed by moving the placement of the frill generating gap. The structure can be made to radiate, partially radiate or completely nonradiate. The invention can function for example as a small antenna, a nonradiating probe or coil, or a resonant transformer.

Abstract: An inexpensive, efficient, broadband, slot-type antenna with unidirectional sensitivity includes a slot-forming means defining a plurality of substantially concentric and generally coplanar annular slots and a non-resonant antenna connection means for transmitting electromagnetic energy to and from the plurality of annular slots. The antenna connection means forms a plurality of non-resonant, radially-extending cavities that are adapted to combine electromagnetic energy received at the plurality of concentric, annular slots substantially in phase and to divide electromagnetic energy between the plurality of concentric, annular slots for transmission from the slots generally in phase and along the central slot axis that lies perpendicular to the two concentric, annular, coplanar slots.

Abstract: A planar integrated opto-electronic transceiver apparatus having a pair of broadband tapered slot line antennas which are monolithically integrated on an ion implanted silicon on sapphire substrate. An optical pulse which is applied to the narrow slot of the transmitting antenna, generates an electromagnetic transient to the antenna aperture from which it is radiated to receiver slot line antenna. The received electromagnetic transient is detected at the narrow slot and is time resolved by an optical sampling signal.

Abstract: A cavity backed crossed slot antenna wherein the cavity depth d is less than one eighth of the operating wavelength .lambda. at the lowest frequency of operation, the major dimension a of the cavity in the plane of the slots is less than one half of the wavelength .lambda. at the lowest operating frequency, and the slots are excited by four symmetrically located capacitive coupled feed probes.

Abstract: Slow wave antenna including slow wave structure of a helical coiled conductor having linear capacitance and inductance distribution. Driving point impedance is changed by varying the ratio of the distributive capacitance to the distributed inductance. Tuning is changed by changing the capacitance between the distributive capacitance common and RF ground. Slow wave antenna structure includes a first embodiment having a slotted pipe with a helically wound conductor and a second embodiment includes a helically coiled element with a plane capacitance structure. In the slotted type of helically wound center conductor antenna, the antenna is tuned by changing the distance between the helix and the outside diameter of the pipe. The antenna is also tuned by changing the capacitance between the pipe and the ground of the RF system. In the helical element with a plane capacitance sheet antenna, tuning is accomplished by varying the spacing of the sheet and hence the capacitance between a conductive sheet and the helix.

Abstract: Disclosed herein is an antenna system for use with small projectile nose es (metal). The antenna comprises a wedge shaped metallized dielectric material having an electrical length equal to one-quarter wavelength as measured inside the center line of the wedge. The metallic coating covering both the top and bottom of the wedge is provided to form a parallel plate radiator. The metallic coating is also extended across the base of the wedge to define an RF short circuit at the base and an open circuit at the apex. An RF coupling probe extending into the wedge is located at a convenient impedance matching point near the base of the wedge. The operating frequency of the antenna may be capacitively tuned (either electrically or mechanically) by means of a variable capacitor connected across the open circuit end (the apex) of the antenna. Typically the dielectric comprises teflon-fiberglass or ceramic material although an air dielectric is also usable.