Abstract: A multiband antenna system for use in a motor vehicle comprising an antenna unit responsible for first and second frequency bands. The antenna unit is electrically coupled to a first conduit tube which is in turn coupled coaxially to a second conduit tube with a capacitor being interposed therebetween. The capacitor is arranged so as to act as a short with respect to the first frequency signal and act as an open for the second frequency signal. The first conduit tube is connected to a first feeding terminal for deriving the second frequency signal and the second conduit tube is coupled to a second feeding terminal to derive the first frequency signal. This antenna system is constructed by using only one antenna unit having a predetermined length, thereby allowing simplification of the arrangement of the antenna system for easy manufacturing.

Abstract: 12 and 17 meter adapter assemblies for a vertical antenna which includes an air wound inductance coil and winged capacitor straps. The adapter assemblies include a coil and wing capacitor straps at one end of the coil where the one end of each coil connects to the antenna and the other end of each coil, including the wing capacitor straps, mechanically connects to the antenna and is electrically insulated from the antenna.

Abstract: A low-profile, broad band monopole antenna (10) includes two linear radiators (11,13), a resistor network (18), and a transmission line network (20), all connected in series in that order. Linear radiator (11) includes a capacitor (12) which reduces the apparent electrical length of the antenna and provides high voltage isolation. Resistor network (18) reduces VSWR at lower frequencies in the band of interest such that in combination with the other elements, the VSWR for antenna (10) is sufficiently low that no further matching or tuning is necessary over the entire broad frequency band of interest without significant loss of gain relative to that of a monopole antenna one-quarter wave resonant at each frequency throughout the frequency band of interest.

Abstract: A low-profile, broad band monople antenna (10) includes two linear radiators (11,13), a resistor network (18), and a transmission line network (20), all connected in series in that order. Linear radiator (11) includes a capacitor (12) which reduces the apparent electrical length of the antenna and provides high voltage isolation. Resistor network (18) reduces VSWR at lower frequencies in the band of interest such that in combination with the other elements, the VSWR for antenna (10) is sufficiently low that no further matching or tuning is necessary over the entire broad frequency band of interest without significant loss of gain relative to that of a monopole antenna one-quarter wave resonant at each frequency throughout the frequency band of interest.

Abstract: A ten-band vertical antenna includes completely automatic band switching for the amateur radio frequencies of eighty, seventy-five meters, forty meters, thirty meters, twenty meters, seventeen meters, fifteen meters, twelve meters, ten meters and six meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which provides for direct coaxial cable transmission line feed. The seventy-five-meter, a switchable eighty-meter, and forty-meter inductor-capacitors are in parallel, while the thirty-meter inductor-capacitor is in series with a portion of the forty-meter circuit thereby providing inductive reactance for operation on eighty meters, seventy-five meters, forty meters, and thirty meters with a series inductor-capacitor connected between an upper vertical radiating element and the forty-meter inductor while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen and ten meters.

Abstract: An antenna construction having a whip supporting sleeve with a depending support pin that is received in a socket in an antenna support sleeve, and with an insulator in the socket electrically separating the support pin from the support sleeve but providing a predetermined capacitance therebetween. The insulator rigidly connects the support pin to the support sleeve to resist lateral loads on the whip in a manner preventing cracking of the insulator. The antenna includes a structural inductance in parallel with the built in pin-socket capacitance to allow a shorter whip at resonance than the prior art base loaded antenna.

Abstract: An AM-FM-cellular telephone multiband antenna adapted for mounting on a motor vehicle fender includes, connected collinearly in order from the bottom, a first mast section having a length of one quarter wavelength at a first frequency near 835 MHz in the cellular telephone band, a phasing coil having an electrical length of one half wavelength at the first frequency, a second mast section having a length of one half wavelength at the first frequency, a trap coil resonant at the first frequency and a third mast section. The trap coil isolates the second and third mast sections at the first frequency so that the phasing coil and second mast section adding gain to the first mass section in cellular telephone reception at frequencies near the first frequency. However, the trap coil connects the second and third mast sections to provide a tuned quarter wavelength antenna at a second frequency in the FM radio band while providing reception at frequencies in the AM radio band.

Abstract: An electric resonator includes first and second pluralities of conductors which are disposed in side-by-side relationship to form a first layer of alternating first and second conductors. Additional layers of alternating first and second conductors are disposed atop the first layer such that each conductor of one of the pluralities is horizontally and/or vertically adjacent to conductors of the other plurality. The resulting resonator reduces undesirable capacitance between various conductors thereby increasing the quality factor, or Q, of the resonator.

Abstract: An eight-band vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of eighty/seventy-five meters, forty meters, thirty meters, twenty meters, seventeen meters, fifteen meters, twelve and ten meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which provides for direct coaxial cable transmission line feed. The eighty-meter and forty-meter inductor-capacitors are in parallel while the thirty-meter inductor-capacitor is in series with a portion of the forty-meter circuit providing inductive reactance for operation on eighty/seventy-five meters, forty meters, and thirty meters with a series inductor-capacitor connected between an upper vertical radiating element and the forty-meter inductor while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen and ten meters.

Abstract: To provide broad bandwidth in a multiple-band directional antenna, the antenna includes an array of parallel horizontal elements, which are: (1) an open-sleeve dipole as the driven element; (2) a trap director element; and (3) trap reflector elements. The driven element includes: (1) a trap central dipole which is center-fed and has sections self-resonant within the bands of 21.0 to 21.45 megahertz and 14.0 to 14.35 megahertz; and (2) two unequal-length sleeves self-resonant at 28.0 to 29.7 megahertz. The director and reflector elements are resonant in the same bands and are spaced and tuned for directivity of the array.

Abstract: Plurality of inductor-capacitor parallel L-C circuits for vertical antennas and beam array antennas where each antenna includes a plurality of circuits, each circuit including an inductor-capacitor tube-coil positioned adjacent a trap of said antenna, the tube-coil assembly including an outer metallic tube, a dielectric insulator telescoped therein, an inner metallic tube, a coil connected between an outer and inner tube about the insulator tube, and a clamp assembly including bolts and wing nuts for clamping the inductor-capacitor coil arrangement substantially parallel and upward to the trap of the antenna. The pluralities of inductor-capacitor tube coils are particularly useful with vertical antennas utilizing traps and directional array antennas utilizing traps.

Abstract: An antenna is provided which exhibits an overall shortened length with respect to the length of the conventional sleeve dipole type antenna. The antenna includes an upper radiating element coupled to a tank circuit to induce resonance at a first resonant frequency and further includes a helical element electrically coupled to a sleeve member which cooperate to resonate at a second resonant frequency.

Abstract: A six-band vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of eighty/seventy-five meters, forty meters, thirty meters, twenty meters, fifteen meters, and ten meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which provides for direct coaxial cable transmission line feed. The eighty-meter and forty-meter inductor-capacitors are in parallel while the thirty-meter inductor-capacitor is in series with a portion of the forty-meter circuit providing inductive reactance for operation on eighty-seventy-five meters, forty meters, and thirty meters with a series inductor capacitor connected between an upper vertical radiating element and the forty-meter inductor while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen, and ten meters.

Abstract: A circuit having several resonant frequencies is disclosed. The capacitance between coils is used instead of discrete capacitor components. One frequency is the self-resonant frequency of a large single layer coil and another frequency is the resonance of the double layered end of the circuit. The use of such multiple frequency circuits as antenna traps and loading coils is shown.

Abstract: A circuit having several resonant frequencies is disclosed, using the interwinding capacitance between layers of coils for the tuned circuit capacitors. The use of such multiple frequency circuits as antenna traps is shown.

Abstract: Antenna traps without a separate capacitor component are disclosed. The traps are tuned by the capacitance between bifilar coils employed as the trap inductor. Simplicity, low cost, and ease of fabrication are the advantages of this trap. A method of winding a trap antenna from a continuous wire that becomes both antenna segments and resonant traps is also disclosed.

Abstract: Antenna traps without a separate capacitor component are disclosed. The traps are tuned by the capacitance between bifilar coils employed as the trap inductor. Simplicity, low cost, and ease of fabrication are the advantages of this trap. Two methods for winding a trap antenna from a continuous wire that becomes both antenna segments and resonant traps are also disclosed.

Abstract: Variable impedance devices (e.g., series resonant circuits and/or transmission line tuning stubs) are connected to predetermined locations on a microstrip radiator patch for effectively changing the effective resonant dimensions of the antenna as a function of frequency and thereby permitting effective operation over a broad range of frequencies.

Abstract: T.V. reception from transmitting stations located beyond the range commonly covered by T.V. receivers using conventional antennas is achieved by means of a highly directional bi-conical antenna structure that accommodates both VHF and UHF signals. Two truncated conductive cone antenna elements are mechanically connected at their apexes to the ends of an r.f. coil to provide the bi-conical antenna structure. The structure is horizontally positioned and rotatable for alignment with a desired station for optimum reception. A monopole antenna element is center tapped to the r.f. coil and the television UHF antenna lead is connected to the r.f. coil. The VHF antenna lead is connected to the bi-conical antenna structure.

Abstract: Serially connected UHF and VHF tuners and control of the lead lengths of the conductors to the tuners from the antenna permit utilization of a single antenna for both the UHF and VHF tuners without need for a crossover network. If the lead lengths are selected to present minimal impedance at the highest UHF frequencies to be received, the intrinsic input impedance for each tuner can be utilized as the crossover network, allowing UHF signals to be applied to the UHF tuner and VHF signals to be applied to the VHF tuner. By use of both external and internal leads in conjunction with a terminal block, each of the tuners is made available for dual antenna operation.

Abstract: A vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of, eighty/seventy-five meters, forty meters, twenty meters, fifteen meters, and ten meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which provides for direct coaxial cable transmission line feed. The eighty-meter and forty-meter resonator capacitor sections provide inductive reactance for operation on eighty/seventy five meters and forty meters while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen, and ten meters. The entire radiator length of the vertical antenna is active on all frequencies except for fifteen meters where the upper portion of the antenna is decoupled above an end of a fifteen-meter quarter-wave decoupling stub in a first embodiment. The entire radiator length of the vertical antenna is active on all frequencies in a second embodiment.

Abstract: A vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of one hundred and sixty meters, eighty-seventyfive meters, forty meters, twenty meters, fifteen meters, and ten meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which permits direct coaxial cable transmission line feed. The eighty meter and forty meter resonator capacitor sections provide inductive reactance for operation on eighty-seventyfive meters and forty meters while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen, and ten meters. The entire radiator length of the vertical antenna is active on all frequencies except for fifteen meters where the upper portion of the antenna is trapped out by a fifteen meter decoupling trap.

Abstract: A feed device is tuned to resonance at a selected frequency, to provide essentially infinite impedance between, for example, a system being fed and the power source. The feed device allows passage of feedline currents, which are equal in magnitude and opposite in phase, but prevents passage of any other, unbalanced currents, e.g., common mode currents, antenna radiation currents, etc. This is due to the fact that the infinite impedance of the feed device defines extremely high attenuation to currents other than feedline currents, at the selected frequency. Thus the resonant feed device acts as an isolating circuit for transmitting and receiving antenna systems and the like, since any unbalance in the antenna elements is isolated from the feedlines, and vice versa, whereby the antenna is truly ground and/or feedline independent.

Abstract: An impedance matching transformer and isolation inductance construction for a vertical-end fed radio antenna which enables simple manufacturing tecniques to obtain uniformity of impedance matching from one antenna to the next and which enables the use of a sintered magnetically permeable core of a length longer than three inches. The impedance matching transformer includes a two turn primary and insulating means accurately spacing these two turns. The core is made up of a plurality of relatively cylindrical formed short core elements from sintered magnetically permeable material in end to end relationship. Very thin plastic spacers are interposed between the adjacent ends of the core elements and between the sides of the elements and the housing to prevent chipping.

Abstract: A three band monopole antenna with such length as to be of greater electrical length than a quarter wavelength of the two highest frequency bands and shorter than a quarter wavelength of the lowest frequency band. The antenna system includes a matching network at its base matching the antenna on three frequency bands related by, substantially, the progression 1, 2, 4, and with the matching network including a shunt inductor and an inductor and capacitor in series with the signal feedpoint.

Abstract: This invention relates generally to a 5/8 wave mobile whip antenna using a re-entrant resonant cavity as an electrically and physically integral component to obtain a narrow bandwith necessary to attenuate off channel interference. One embodiment is a coaxial type of re-entrant cavity resonator as an electrically and physically integral part of a 5/8 wave whip antenna. A second embodiment is a hybrid type of re-entrant cavity resonator referred to as a helical cavity resonator as an electrically and physically integral part of a 5/8 wave whip antenna.

Abstract: A dipole antenna consisting of a number of sub-elements, each sub-element comprising a plurality of thin electric conductors or strips of wires arranged on the surface of an insulating cylinder. The conductors in each sub-element have the same length and are distributed around the circumference of the cylinder, so that each such sub-element forms a so-called "thick" dipole element. The lengths of the conductors in different sub-elements are different, so that the sub-elements together will cover a broad frequency band. At least each conductor in the group having the longest conductors are provided with inductive reactances, to prevent excitation of said longer conductors in higher modes at resonance frequencies of the shorter conductors.

Abstract: An insulating core including a helical groove for use in a coil form, U-shaped grooves for use in an insulator in compression and diametrical holes for use in an insulator in tension. The wire used in the system is part of an antenna system.

Abstract: A dual mode high-frequency printed circuit radar antenna for aircraft use having good aerodynamics is provided in the form of a printed circuit antenna molded into a smooth, blade-like protective shield. The antenna, printed on an epoxy glass substrate carried on a mounting plate including, integrated in series, a stub monopole element and a larger area capacitive loading member for I-band reception, an inductive member whose impedance is very high at I band and a monopole element which adds sufficient length that the entire conductor track acts as a quarter wave length monopole at C and D bands. At I band the stub monopole element and capacitive loading is isolated from the added monopole element by the high impedance inductive member, making for good I-band performance.

Abstract: An antenna configuration in which multiple frequency band coverage is obtained in simple structures. This invention is most useful in the high-frequency spectrum where other techniques of providing multiple frequency operation become physically difficult to implement. The antenna configuration includes a multiplicity of conductor elements, a coaxial cable network for interconnection of the elements and connection to a feedline, and a high permeability core to aid decoupling to the feedline exterior from the antenna proper.

Abstract: A driven quad antenna unit includes four perpendicularly arranged antenna elements, each element containing therein a high Q load coil in order to reduce the overall size of the antenna structure. A similarly configured parasitic loop unit functioning as a director or reflector (or both may be employed) is located in front or behind, as the case may be, the driven antenna unit. As with the driven unit, each side of the parasitic unit has a coil connected therein, the number of turns in each coil of the director being somewhat less than in the number in the coils of the driven unit and somewhat greater in the coils of the reflector.