Abstract: Antenna system for double polarization in two high frequency bands of different frequency positions includes a orthomode transducer, in the following text called polarization filter having an antenna end terminal and two directional terminals, one being for right circular polarized waves, and the other being for left circular polarized waves. These directional terminals connect, respectively, with two frequency filters which separate the signals into the lower of the two high frequency bands, and the higher of the two high frequency bands. There are two 3-dB 90.degree. directional couplers, one of which handles right and left circular polarized signals of the lower frequency band, and the other of which handles right and left circular polarized signals of the higher frequency band. The polarization filter is constructed to be phase-symmetrical with respect to its transit paths.

Abstract: This specification discloses a microwave circular polarizer for converting a linearly polarized microwave signal to a circularly polarized microwave signal and vice versa. A transducer, such as an Orthomode junction is used to obtain a power split or a power recombination of two orthogonal linear polarizations. To obtain the phase delay required to generate a circularly polarized signal from two linearly polarized signals, the polarizer includes a phase compensator with a pair of waveguides which have appropriate width and length so that signals passing therethrough develop a phase difference therebetween and a composite circularly polarized signal results. The amount of phase shift occurring in each of the waveguides varies with the frequency of the signal in such a way as to produce a high purity circular polarization over a broad frequency band. A phase shift of 90.degree.

Abstract: An improved antenna system is disclosed in which a single antenna array is simultaneously used in conjunction with several independent radio devices. Isolated and independent radio transmitters are coupled, without any signal cancellation, to each and every one of a plurality of isolated independent antenna elements by a combining network which maintains the isolation between each of the radio transmitters and each of the antenna elements. The combining network comprises an array of hybrid networks and creates a predetermined electrical phase difference between each signal received by an individual antenna element. The antenna elements form a single antenna array consisting of circularly disposed corner reflector antennas. Each reflector independently creates an individual radiation pattern and these patterns combine to form a single desired composite radiation pattern.

Abstract: An electrical circuit and method for providing electrical coupling from a CB antenna to both a CB (Citizen's Band--Class D) transceiver and to an AM-FM receiver (amplitude modulation--frequency modulation) whereby only a single antenna need be used for both CB transceiver and AM-FM receiver.

Abstract: A non-directional transmitting system non-directionally and simultaneously transmits four signals of different but closely spaced frequency. The system comprises four directional antennas, each oriented to face in a different respective direction, each direction being spaced 90.degree. from the next one. Each directional antenna simultaneously transmits one fourth of the power of each one of the four signals, making for an overall non-directional effect. The four signal sources are coupled to the four directional antennas by way of four 3-dB couplers in such a way that substantially all the power of each signal is transmitted equally to the four directional antennas, avoiding the power loss customary when plural signal sources are coupled to a common non-directional antenna using 3-dB couplers.

Abstract: A vehicle-mounted antenna simultaneously coupled via a passive electrical network to a 40-channel Citizens band transceiver and to an AM-FM receiver is disclosed. A non-loaded whip antenna, sized to be electrically short at Citizens band frequencies, is cowl-mounted in a conventional manner to present the dimensions and generaly appearance of a standard broadcast band car radio antenna. The passive electrical coupling network includes a broadband compensated, quarter-wave transmission line transformer for impedance matching the electrically short antenna to the Citizens band transceiver, and associated L-C circuits for selectively blocking, bypassing and separating AM and FM band signals relative to each other and to Citizens band signals. The disclosed antenna with its associated network provides excellent AM-FM radio receiver reception while presenting to the Citizens band transceiver a voltage standing wave ratio of 1.5:1 or better.

Abstract: A coupling converter for use of a broadcast-receiving antenna both with its broadcast receiver and with a citizens band transceiver, including impedance matching means and a priority switch to protect the transceiver from overload by transmission without sufficient antenna loading.

Abstract: An antenna for simultaneous connection to a citizen's band transceiver, an AM receiver and a FM receiver, particularly suitable for use on a vehicle such as an automobile. The antenna proper is a center-loaded upstanding rod which, in the preferred form, telescopes downwardly to a retracted position where it does not protrude above the ground plane. The antenna proper is connected to a T-connected open stub transmission line and to a FM resonant relatively high impedance signal-carrying transmission line. The former has inductive reactance in the FM band which offsets the capacitive reactance of the relatively short effective length of the antenna proper in the FM frequencies. The signal-carrying transmission line is substantially half wave in length in the FM band so as to reflect impedance at its far end substantially equal to the impedance present at the T-connection.

Abstract: An antenna matching network for matching a citizens band radio transceiver to a standard automotive whip or windshield antenna utilizes a matching section for matching the nominal 50 ohm output of the citizens band transceiver to the generally lower impedance of the automotive antenna. A trap tuned to the citizens band prevents the output of the citizens band transmitter from damaging the automotive broadcast receiver when transmitting. The matching section is tunable over a sufficient range to match the citizens band transceiver to most automotive antennas, and a dual sensitivity indicator is utilized to aid the operator in tuning the matching network to provide optimum matching without the use of specialized equipment.

Abstract: A branching filter for branching two microwaves from waves having two microwaves and a plurality of milliwaves includes two groups of coupling holes fluidically connected to one or more band-pass filters and a branching waveguide, one group of coupling holes being arranged on the wall of the conical horn so as to be equiangularly disposed thereabout with a 90.degree. interval defined between adjacent coupling holes when, for example, four coupling holes, filters, and waveguides are employed in such group, while the second group of coupling holes, disposed axially downstream of the first group of holes by means of a predetermined distance, is similarly disposed about the horn although angularly offset with respect to the holes of the first group through means of an angle of 45.degree..

Abstract: A radio-frequency coupler comprising a first terminal for interconnection with a conventional automobile receiving antenna used for receiving rf transmissions within a first radio-frequency band, a second terminal for interconnection with a receiver operating within the first radio-frequency band and a third terminal for interconnection with a transceiver operating within a second frequency band different from the first band. A first rf transmission path extends between the first terminal and the second terminal and a second rf transmission path extends between the first terminal and the third terminal. A first resonant circuit is connected in the first rf transmission path and tuned to pass rf transmissions in the first band but substantially block those in the second band.

Abstract: A multimode coupling system includes a funnel-shaped coupling member having one coupling aperture at the narrow end thereof, one larger coupling aperture at the larger end thereof, and a plurality of coupling apertures in the side wall thereof. A first and second of these side wall apertures lie in a first common plane on diametrically opposite surfaces of the member. A third and fourth of these apertures lie in a second common plane orthogonal to the first and on diametrically opposite surfaces of the member. A coupling circuit is provided between the plurality of side wall coupling apertures and an asymmetrical mode terminal for advancing the phase of signals at the first and third side wall apertures approximately 90.degree. relative to the phase of signals at the second and fourth side wall apertures to thereby achieve coupling of asymmetrical mode signals between the larger end and the asymmetrical mode terminal.