Abstract: A antenna (1) includes a radiating portion (3), a ground portion (2) and a feed cable (6). The radiating portion includes a printed circuit board (PCB) (31), a radiating element (32) and a mounting portion (33). The radiating element and the mounting portion are separately mounted on a same surface (311) of the PCB. The ground portion has a metal plate (22) and a coupling portion (21) on bottom surface (221) of the metal plate. The coupling portion connects with the mounting portion. The feed cable includes an inner conductor (61) connected with the radiating element and an outer conductor (62) connected with the metal plate.

Abstract: An antenna assembly has a pair of disk-shaped antennae each tuned to a different frequency band thereby enabling the same antenna to be used to different types of communication equipment, such as cellular and PCS telephones. The first antenna has a first substrate with first and second conductive layers applied to its major surfaces, and the second antenna has a second substrate with third and fourth conductive layers applied to its major surfaces. A primary shunt extends between the first and second conductive layers to tune the first antenna, and a secondary shunt extends between the third and fourth conductive layers to tune the second antenna. The first and second antennae abut with the first conductive layer contacting the fourth conductive layer. A pair of electrical conductors are connected to different ones of the second and third conductive layers to carry communication signals to the antenna assembly.

Abstract: A slot 2 is defined by notching a conductor plate 1, a first radiation conductor 3 and a second radiation conductor 4 are disposed by sandwiching the slot 2 as a boundary, a third radiation conductor 5 connected to either of the first radiation conductor 3 or the second radiation conductor 4 is provided in the slot 2, if necessary, on and after third radiation conductors, for example, a fourth and fifth radiation conductors connected to either of the first radiation conductor 3 or the second radiation conductor 4 are provided, a power is supplied in the slot by the use of conductor edges of at least two radiation conductors, if required, whereby two monopole antennas and slot antennas, which use respective electric currents on the first radiation conductor 3 and the second radiation conductor 4, are electrically formed, besides, antennas other than that described above are electrically formed by utilizing electric currents over on and after the third radiation conductors.

Abstract: There is disclosed a meanderline loaded antenna formed by applying a conductive ink or other conductive material to a flexible substrate. The substrate is then shaped by removing regions and folding other regions along perforated or scored lines to fit the antenna within the available space of a wireless device. In lieu of folding regions of a planar substrate to form a three-dimensional structure, the substrate can be vacuum formed over a mandrel after the antenna elements have been formed thereon. The antenna can also be formed by printing on existing enclosure surfaces of a wireless device or on the surfaces of components within the device. Thus the advantages offered by a meanderline antenna where the effective electrical length is greater than the actual physical length are achieved in conjunction with a space-saving physical structure for the antenna.

Abstract: An apparatus and method to reduce the size of a microstrip antenna without sacrificing antenna efficiency too much are described. The antenna structure includes discontinuity of strip width in the middle of the antenna patch to reduce the size of the antenna at a given resonant frequency. The antenna structure further includes a plurality of patches of differing widths connected to each other at junctions. The junctions are placed symmetrically to ensure maximum radiation at the boresight and also to further reduce cross-polarization levels. A coaxial feed is connected at a predetermined location near the center of a patch, having a narrower width, in order to match the input impedance of the antenna to the coaxial feed.

Abstract: An antenna which includes a monoconical antenna feed assembly, where the feed assembly has a base and an apex, a ground plane adjacent to the monoconical antenna feed assembly near the apex, and an antenna reflector coupled to the ground plane, where the antenna reflector at least partially surrounds the monoconical antenna feed assembly. The monoconical feed point is used to drive a reflector antenna. The broadband characteristics of the monoconical image vertical antenna (typical ground plane geometry) are used as the feed point for the reflector to give modest amount of gain while maintaining larger than previously developed bandwidths.

Abstract: Internal planar antenna especially applicable to mobile communication devices. A PIFA-type planar antenna is fed coaxially-like. This means that the feed conductor (321) of a radiating plane (310) is surrounded by a shield conductor (322) galvanically connected to the ground plane (GND) for the length between these planes. The shield conductor at the same time serves as a short circuit conductor for the antenna. The antenna is matched by means of a matching slot (317) going between the connection points of the feed and short circuit conductors, and/or of the shape of the short circuit conductor. A feed arrangement at issue increases antenna gain without increasing the SAR value of the antenna.

Abstract: A multi-band printed monopole antenna (1) includes a substrate (2), a ground portion (4) disposed on the substrate, a radiating portion disposed beside the ground portion and feeder cable (5). The radiating portion comprises a first and second radiating patches, (31, 34) and a first and second connecting patches (32, 33). The second radiating patch resonances at a lower frequency band. A resonance slot formed between the first radiating patch and the ground portion for occurring a secondary resonance in a higher frequency band.

Abstract: A device for promoting the remote communication of a portable computer is described having a base that is attachable to the computer, an antenna that projects outward from the base, and a cable that connects the base to the computer. The device is made adjustable to fit a variety of different types of portable computers and be secured tightly on to them.

Abstract: To provide a wireless tag having a wide band, a microstrip-line of a half wavelength type is used and an IC is built in between an antenna and a ground conductor, and a middle point of the antenna and the ground conductor are connected.

Abstract: Disclosed is a high performance, low cost antenna for wireless communication applications which benefit from a dual feed diversity antenna. The antenna device can be fabricated from a single layer of conductive material, thus allowing easy, low cost manufacture of a high gain antenna. Antenna embodiments may provide both spatial and polarization diversity. The antenna need not be planar, but rather may be bent or formed, such as to provide an antenna which is conformal with the shape of a wireless communication device. Furthermore, other embodiments of the present invention may be made of thin film, conductive foil, vapor deposition, or could be made of a flexible conductive material, such as metallized MYLAR. Each of the slot elements may be linear or may be formed in a meander shape or other shape to reduce size. The slot elements may be provided within an antenna array useful for beam scanning applications.

Abstract: A wireless communication system for closed environments including a plurality of antennas parallel line coupled to the coaxial cable of a coaxial cable radio frequency transmission system. Each antenna includes a quarter wavelength long conductor positioned between the center and outer conductors of the coaxial cable. The conductor is axially aligned to the cable and insulated from the center and outer conductors by the cable's dielectric core. The conductor is connected to a quarter wavelength radiator supported by a conductive bar clamped to the exterior of the coaxial cable.

Abstract: Ultra-broadband thin planar antenna has a flat elliptical element and a spaced rectangular element co-planar with the elliptical element. The inner conductor of a coaxial cable connects to the elliptical element near a gap between the elements and the outer conductor of the coaxial cable connects to the rectangular element. A housing encases the elliptical and rectangular elements and the transmission line. The antenna functions electrically as an asymmetrical planar dipole having a special configuration or as an elliptical planar monopole with a co-planar finite rectangular ground plane.

Abstract: A monopole wire-plate antenna comprising a ground plane (10), a first radiating element in the form of a capacity top (11, 12) adapted to be connected to a generator, and a second radiating element in the form of a conductor wire (14, 14′, 15, 15′) connecting the capacity top to the ground plane is disclosed. It comprises a plurality of at least one of said radiating elements.

Abstract: The present invention relates to a communications antenna structure. The communications antenna structure comprises first and second antennas each having an axis about which a mode of electrical field vector polarisation can be generated. In a first orientation, with an axis associated with the structure vertical, the first antenna operates in a horizontal mode of electrical field vector polarisation and the second antenna operates in a vertical mode of electrical field vector polarisation; and, in a second orientation, with said structure axis horizontal, the first antenna operates in a vertical mode of electrical field vector polarisation and the second antenna operates in a horizontal mode of electrical field vector polarisation.

Abstract: A low loss, compact radio antenna and antenna loading method. For a monople antenna a tubular, conductive radiating element provided whose length is less than one-quarter the wavelength of the nominal frequency of the antenna. A tubular conductive series loading element disposed within the radiating element, the series loading element having a first end for connection to a radio and being electrically connected to the radiating element at a position spaced outwardly from the first end so as to provide inductance in series with the radiating element. An elongate conductive shunt matching element is disposed within the series loading element for electrically connecting the series loading element from a point therein to a mirror image thereof so as to provide shunt inductance that matches the impedance of the antenna to the impedance of a device connected thereto at the nominal frequency.

Abstract: A V type aperture coupled circular polarization patch antenna constructed with a microstrip line formed on a rear face of a dielectric substance, a ground surface formed on an entire face of the dielectric substance, a V type aperture formed at a desired angle on the basis of a portion of the ground surface, which overlaps with the microstrip line, and a patch formed into a rectangular shape and mounted at an upper portion of the aperture so as to cover the aperture. At 1.9375 GHz, which is one of center frequencies of IMT-2000, the reflection loss is −11.34 dB, the band width at minus 10 dB is 15.2% (295 MHz), the beam width is 60°, and a proper circular polarization may be obtained.

Abstract: To provide a wireless tag having a wide band, a microstrip-line of a half wavelength type is used and an IC is built in between an antenna and a ground conductor, and a middle point of the antenna and the ground conductor are connected.

Abstract: Provided are a low-cost and high-performance antenna that can be placed in a small space inside a portable terminal or an electric appliance or housed in a wall or the like, and an electric apparatus having the antenna. A slit having a specified width and a specified length is formed in a conductive flat plate having a specified width and a specified length. A radiating element portion shaped like a monopole antenna and a ground portion (having a specified width) are formed with the slit between them. The width of the conductive flat plate (the length of the radiating element portion) is substantially a multiple of a quarter of a wavelength attained at the operating frequency of the antenna by an odd-numbered value.

Abstract: An electrically small, planar ultra wide bandwidth (UWB) antenna is disclosed. The antenna has a conductive outer ground area that encompasses a tapered non-conducting clearance area, which surrounds a conductive inner driven area. The feed is unbalanced with the terminals are across the narrowest part of the non-conducting clearance area which is tapered to provide a low VSWR across ultra wide bandwidths exceeding 100%. The antenna can be arrayed in 1D and 2D on a single common substrate. Amplifiers can be readily mounted at the feed.

Abstract: To provide a wireless tag having a wide band, a microstrip-line of a half wavelength type is used and an IC is built in between an antenna and a ground conductor, and a middle point of the antenna and the ground conductor are connected.

Abstract: The present invention provides a matched mode antenna feedline desiged to achieve simultaneous modal impedance matching with a multiple mode N-fold symmetric or N-fold polygonal antenna such as, for example, spiral antennas, sinuous antennas, modulated arm width (MAW) spiral antennas, log periodic dipole (LPDA), monopole (LPMA) arrays, and an N-fold polygonal antenna. In one embodiment, the matched mode antenna feedline (10) includes a plurality of transmission lines (20) arranged in a circular cluster around a central axis (12). Each transmission line (20) extends from an input end (22) thereof connectable with a device such as a beamformer to an output end (24) thereof connectable with an antenna feedpoint. A transition section (30) is provided between the input and output ends (22, 24) of each transmission line (20) wherein the transmission lines (20) are smoothly transitioned from a decoupled state proximal to the input ends (22) thereof to a coupled state proximal to the output ends (24) thereof.

Abstract: Dispersive surface antenna structures (300, 700) provide improved selectivity and increased control over bandwidth. Antenna structures (300, 700) include a wraparound piece of conductive material located perpendicular to a ground plane (304, 704). Ground posts (302, 702) extend up from the ground base (304) and capacitively couple to a front conductive surface (301, 701) of the antennas (300, 700). First and second conductive back surfaces (305, 306), (705, 706) are capacitively coupled across a gap (307, 707) along the back of the antennas (300, 700). The size, width, and location of the gap (307, 707) along with the ground posts (302, 702) provide increased control over antenna performance.

Abstract: A two-element driven array with improved tuning and matching. First and second elongate conductive elements are provided having respective feed point gaps disposed substantially at their centers, the second elongate element being substantially coplanar and parallel with the first elongate element and spaced a predetermined distance therefrom. A phasing transmission line is connected between the feed point gap of the first elongate element and the feed point gap of the second elongate element so as to reverse the polarity there between. A variable transmission line having a movable shorting member is connected at one end thereof to the second end of the phasing transmission line. The first end of the phasing transmission line is the feed point for the antenna. A combined balun and impedance matching network is providing for coupling the antenna to an unbalanced, coaxial feed line. The combined network includes a shorting stub to adjust the impedance match between the antenna and the feed line.

Abstract: A dual band antenna for a mobile communication system which includes: a metal tube having an open end; a coaxial feed line having inner and outer conductors, with one portion of the coaxial line inserted into the metal tube, a ground plane connected to a portion of the metal tube opposite the open end and to the outer conductor of the coaxial feed line, and, a signal line electrically coupled to the inner conductor and protruding from the metal tube at the open end thereof. Preferably, the dimensions of the metal tube, the coaxial feed line and the signal line are selected such that the antenna is impedance matched to the coaxial feed line over the dual operating band, thereby obviating the need for a separate matching network.

Abstract: The dual polarization antenna includes a substrate having a ground plane and a dielectric layer adjacent thereto, and at least one antenna unit carried by the substrate. The antenna unit includes four adjacent antenna elements arranged in spaced apart relation from one another about a central feed position on the dielectric layer opposite the ground plane. Preferably, diagonal pairs of antenna elements define respective antenna dipoles thereby providing dual polarization. The antenna unit also includes an antenna feed structure having four coaxial feed lines, each coaxial feed line including an inner conductor and a tubular outer conductor in surrounding relation thereto. The outer conductors have parallel adjacent ends joined together about an axis and are connected to the ground plane. The ends of the outer conductors are tapered and arranged so that portions thereof adjacent the axis extend further beyond the ground plane in the dielectric layer and toward the antenna elements.

Abstract: A printed Yagi antenna of the present invention has a circuit board, a driven element having an impedance &OHgr;d and being printed on the circuit board, a director element printed on the circuit board, a reflector element printed on the circuit board, a microstrip transmission line, and a coaxial cable having and impedance &OHgr;c. The coaxial cable feeds the driven element via the miscrostrip transmission line and &OHgr;c is approximately equal to &OHgr;d. Further, the spacing between the reflector element, the driven element, and director elements are chosen so that an optimum balance is achieved between directional gain and performance sensitivity. The printed Yagi antenna has a partial folded driven element having a J shape which is grounded at the mid-point of the longest portion of the element. The configuration allows for a coaxial cable to be attached directly to the microstrip transmission line without the use of a matching network or balun.

Abstract: A compact wideband leaky-wave excitation microstrip antenna is provided by a group of microstrip patches disposed on a top region of a dielectric substrate stacked on a conductive ground plane. The top region of the dielectric substrate and the dielectric substrate can be composed of either the same or different dielectric materials. A means for feeding an RF signal, which can be a center feed pin, that normally touches the top conducting patch is electrically isolated from the radiating patches. This arrangement confines the feed current within the probe pin to give an increased input resistance. The compact wideband leaky-wave excitation microstrip antenna permits significant reductions in antenna size, resulting in microstrip antennas with a smaller surface area.

Abstract: A dual-notch loaded microstrip antenna has a single-medium substrate, a metal layer and a microstrip antenna layer, wherein the microstrip antenna layer of the microstrip antenna is etched into a double dual-notch or a single dual-notch structure. The microstrip antenna layer and the metal layer adhere respectively to opposite sides of the single-layer substrate, wherein the metal layer works as the electrical ground. The single-layer substrate contains a penetrating opening whose diameter and location are predetermined. The task of transmitting and receiving dual-band or multi-band signals is carried out by feeding the microstrip layer with signals from a connector, such as a coaxial connector, through the penetrating opening.

Abstract: The multifunction printed-circuit antenna is designed for the reception of radioelectric waves sent by the GPS, GLONASS and MLS radio navigation systems. It comprises first, second and third circular patches that are parallel to one another and superimposed in this order above one and the same ground plane that is parallel to them, the centers of the patches being aligned on one and the same axis z′z perpendicular to the plane of the three patches, the patches being separated from one another by thicknesses of a substrate-forming dielectric material for each of the patches. The first and second patches form, with the ground plane, the antenna structure for the reception of the GPS, GLONASS waves. The MLS antenna reception structure is formed by the third and second patches. The second patch also serves as a ground plane for the MLS antenna structure.

Abstract: Dispersive surface antenna structures (300, 700) provide improved selectivity and increased control over bandwidth. Antenna structures (300, 700) include a wraparound piece of conductive material located perpendicular to around plane (304, 704). Ground posts (302, 702) extend up from the ground base (304) and capacitively couple to a front conductive surface (301, 701) of the antennas (300, 700). First and second conductive back surfaces (305, 306), (705, 706) are capacitively coupled across a gap (307, 707) along the back of the antennas (300, 700). The size, width, and location of the gap (307, 707) along with the ground posts (302, 702) provide increased control over antenna performance.

Abstract: A low-profile antenna has increased broad-banding capacities as well as a lower radiation angle for enhanced cellular or mobile telephone wireless transmissions. Enhancing a basic PIFA antenna, a top metal radiator is notched so as to provide additional corners and greater perimeter length thereby enhancing the bandwidth capabilities of the antenna. Both ground and tuning tabs serve to enhance operational characteristics and a dielectric cover incorporating prismatic qualities serves to lower the radiation angle of transmission from approximately forty degrees (40.degree.) to twenty degrees (20.degree.). The prisms provide an operating radiation angle in the range of approximately seventy degrees (70.degree.) to twenty degrees (20.degree.).

Abstract: A curved inverted-L and F antenna is disclosed. In a preferred embodiment a curved inverted-F antenna 300 comprising a capacitative line 206 and inductive stub 204 is disposed above a correspondingly curved ground plane 308. Preferably, the separation between the capacitative line 206 and ground plane 308 is substantially constant and of the order of one tenth of the wavelength of the operating frequency of the antenna. Suitably the short circuit element of the antenna and the feed track 402 are non-parallel which has the effect of improving the radiated field in a short circuit direction.

Abstract: A broadband phased antenna is comprised of multiple patches which are dirly feed. The multiple patches provide the broadband patch antenna having overlapping narrow frequency bands and comprise a ground-plane element, multiple antenna elements, multiple dielectric layers, an RF feed line, and a feed arrangement. The ground-plane element has predetermined length and width dimensions and an aperture therein at a predetermined location near its center. The multiple antenna elements have an uppermost antenna element. The multiple dielectric layers are respectively interposed between and separate the multiple antenna elements into a stacked arrangement having odd and even numbered antenna elements.

Abstract: An antenna assembly has a first antenna with a planar dielectric first substrate and electrically conductive layers on opposing major surfaces of the first substrate. One or more hollow electrical shunts extend between the conductive layers and separate conductors are connected to the geometric centers of each conductive layer to carry communication signals to and from the first antenna. A second antenna abuts the first antenna and has a second planar substrate of dielectric material with a conductive radiating pattern on one surface. In an active version of the second antenna, a low noise amplifier is mounted on the second substrate. Another conductor extends through the hollow electrical shunt and is connected to the conductive pattern.

Abstract: An aperture-coupled antenna, comprising at least one antenna element including a number of substantially planar, mutually parallel radiating patches (1-3) being fed with microwave power from a feed network (6) via an aperture (5a, 5b) in a ground plane layer (4). The feed network (6) feeds microwave power in at least two separate frequency bands, including a first, relatively low frequency band and a second, relatively high frequency band. A first patch (2) radiates microwave power in the first frequency band and is provided with an aperture (9a, 9b) so as to couple microwave power in the second frequency band to a second patch (1), the microwave power in the second frequency band being fed from the feed network (6) via the apertures (5a, 5b; 9a, 9b) in the ground plane layer (4) and the first patch (2) to the second patch (1).

Abstract: An antenna adapted for surface deployment is provided. A coaxial feedline, erminated at one end thereof at a feedpoint, has a center conductor and a shield at ground potential. A continuous length of antenna wire having first and second ends is electrically connected at its first end to the center conductor at the feedpoint. A first portion of the continuous length is spooled adjacent the first end. A second portion of the continuous length is deployed from the first portion by means of tension at the second end. The second portion extends to the second end along a substantially straight line away from the first portion. The second portion is typically at least as long as the first portion. The first portion serves as a variable tuning inductor for the antenna as the second portion is deployed therefrom.

Abstract: A broadband partial fan cone direction finding antenna and array disclosed. The antenna includes a radiator having a partial cone shape. The radiator substantially occupies a spatial area defined by a portion of a cone and the cone is defined by a cone axis, a cone height, and a cone angle. The cone has a base and an apex, and the portion of the cone is defined by a cone sweep angle. The cone sweep angle is determined as the angle subtended by a projection of the portion of the cone projected onto a plane that is perpendicular to the cone axis. The cone sweep angle is less than 360.degree. so that the portion of the cone is bounded on its sides by edges which extend radially from the apex of the cone outward to the base of the cone.

Abstract: An antenna (1) has a radome (2) and a conducting ground plane (6) bridging between conducting end caps (4), a circuit board (5) supported on the ground plane (6), rf antenna elements (7) on the circuit board (5), opposite ends of the ground plane (6) being slidable relative to respective end caps (4) in response to thermal expansion of the ground plane (6), and the circuit board (5) being slidable relative to the ground plane (6) in response to thermal expansion of the ground plane (6).

Abstract: A phased array antenna having stacked-disc radiators embedded in dielectric media. The phased array antenna has a rectangular arrangement of unit cells that are disposed on a ground plane. A lower dielectric puck with a high dielectric constant is disposed on the ground plane. An excitable disc is disposed within the perimeter of and on top of the lower dielectric puck. An upper low dielectric constant dielectric puck that has a dielectric constant lower than that of the lower dielectric puck is disposed on the excitable disc. A parasitic disc is disposed within the perimeter of and on top of the upper dielectric puck. Dielectric filler material having a dielectric constant that is lower than that of the lower dielectric puck surrounds the dielectric pucks. A radome 18 is disposed on top of the parasitic disc and the unit cell. Two orthogonal pairs of excitation probes are coupled to the lower excitable disc.

Abstract: In a broadband antenna using a semicircular conductor disc, a semicircular cutout is formed in the semicircular radiator concentrically therewith. Alternatively, a semicircular arcwise radiating conductor with a semicircular cutout defined concentrically therewith is bent into a cylindrical shape to form a radiator.

Abstract: The invention is based on a planar concept and involves the configuration of a planar radiating element with the property of generating wide-band electromagnetic radiation fields with circular field polarisation. A wide-band radiating element is developed in which the radiating and excitation network planes are separated and excitation of the radiating element is achieved using a coupling waveguide comprising a group of highly conductive planar elements stacked along the normal to their (large) surfaces above a conductive ground plane; to ensure a large radiation band-width, the highly conductive planar elements are placed well above the conductive ground plane and their highly inductive coupling components (which are connected to the ground plane) are compensated by special coaxial waveguide diaphragms whose ellipticity of the circular polarisation is adjusted solely by circular or square diaphragms within the planar contour, without affecting the radiating edges.

Abstract: A composite antenna comprising a first and second antenna suitable for transceiving independent signals in the cellular communication and GPS bands. The first antenna has upper and lower electrically conductive discs of substantially the same size aligned substantially in parallel, a first means for application of a first electrical signal between and at substantially geometric centers of the discs, and a plurality of electrically conductive shunts. The second (GPS) antenna is attached atop the upper electrically conductive disc and has a second means for application of a second electrical signal to the GPS antenna which traverses the electrically conductive discs whereby there is no significant degradation in performance of either the first cellular antenna or the second GPS antenna.

Abstract: An antenna is constructed as an "on-board antenna" in the form of conductor tracks on a circuit board. A conductor track on the upper surface of the circuit board is electrically connected to a conductor track on the lower surface thereof through plated-through holes. This increases both the effective antenna surface area and thus the radiation power.

Abstract: A physically short broad-bandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. Low ohmic resistance due to the small physical size combined with system impedance transformation and capacitive input coupling provide radiation resistance corresponding to an efficiency of about 85 percent. The 2:1 SWR bandwidth is 50 kHz on 160 meters and 87 kHz on 80 meters. A 30 foot mast, top hat capacitive load, and a plurality of parallel vertical skirt wires depending from the top hat around the mast are electrically connected together at the top of the mast. An impedance transforming multi-tap coil is connected between mast and ground. Skirt wires are in two sets separately fed at their lower ends by separate coaxial cable coupling capacitors for operation on different bands. A 50 ohm feed line, skirt wires, coupling capacitors and impedance transforming coil all have terminal connections on a mast-base insulator.

Abstract: A wideband antenna has a planar conductive tab, a planar ground plane and transmission line. The conductive tab is sub-wavelength in all dimensions and has a top edge that is wider than its bottom end. The width of the conductive tab tapers from the top edge to the bottom end. The ground plane is parallel with and located below the conductive tab. The wideband antenna of the present invention, called a tab monopole, is planar in form enabling it to be readily manufactured using standard printed circuit board methods and facilitating its integration with packages and radio frequency circuitry used to feed the antenna. Operational bandwidths in excess of 40% were realized by this wideband, sub-wavelength antenna.

Abstract: An antenna (20) including a continuous planar conductor (22) in a coaxial connector. The planar conductor (22) is made by stamping an array of slots (30) in a continuous sheet of metal with ends of adjacent slots (30) being offset from each other in an alternating pattern of long and short slot portions (32, 36) on each side of a centerline of the array; at least filling each slot (30) with a dielectric material (50), thereby defining a slot filled strip; and cutting along each side of the slot-filled strip intersecting each filled long slot portion (32) at a sufficient distance from the ends of adjacent ones of the filled short slot portions (36) to define a strap (42) of metal connecting the metal strips on each side of each slot (30).

Abstract: An antenna which is adapted to have multiple fundamental resonances includes an outer conductor electrically connected to a feed network and having a generally tubular portion opening through one end to define an internal cavity therein. The antenna also includes an interior conductor electrically connected at a first end to a portion of the outer conductor within the internal cavity. The interior conductor extends through the opening defined in the outer conductor to a second end to thereby define an extended conductor portion which extends beyond the outer conductor. The antenna also includes decoupling means for electrically decoupling the extended conductor portion of the interior conductor from the antenna for signals having frequencies within the upper frequency band. In one embodiment, the internal conductor portion has a predetermined electrical length equal to an odd multiple of a quarter wavelength of a signal having a frequency in the upper frequency band of the antenna.

Abstract: A High Efficiency Compact Antenna Assembly for use as a vertical antenna, used for the radiation and reception of various band length signals. The antenna assembly includes an assembly such that operation of the antenna is as efficient as antennae of much greater height. The structure of the assembly preferably includes a large surface area housing atop a conductive mast and in spaced apart electrical communication with a substantially circular collector. Spanning from the outside wall of the vertical cylinder to the mast is a minimal turn inductor so that the inductor does not create a field that would interfere with the field from the mast of the antenna. A transmitter.backslash.receiver is in connection with the antenna assembly at the mast and the collector. The mast, minimal turn inductor, and vertical cylinder are in connection with each other, while the collector interacts electrically with each.

Abstract: The antenna is a hybrid microstrip and reflector antenna having a planar patch antenna mounted to an upper surface of an insulated planar substrate. The substrate is coupled to a ground plane by one or more insulated couplers so as to form an airgap therebetween. A coaxial cable connectable to a transceiver is coupled to the bottom surface of the ground plane at the outer conductor thereof and the inner conductor is coupled to a feed pin which passes through the ground plane and protrudes through the surface of the patch. The feed pin is secured to the patch by soldering.