Wave transmission lines and networks – Coupling networks – With impedance matching
Patent
1976-03-03
1977-07-19
Smith, Alfred E.
Wave transmission lines and networks
Coupling networks
With impedance matching
333 8, 333 70R, 333 76, 343858, H03H 710, H03H 738, H03H 746, H03H 714
Patent
active
040371778
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. A second resonant circuit is connected in the second rf transmission path and tuned to resonate at a frequency within the second band so that rf transmissions within the second band are passed but those within the first band are substantially blocked. A third resonant circuit is connected between the third terminal and electrical ground and tuned to resonate at a frequency outside the second band. The second and third resonant circuits form a series-connected path between the first terminal and electrical ground and the impedance of the third resonant circuit at the second frequency band allows maximum rf energy within the second band to be transferred between the antenna and the transceiver thereby permitting the conventional automobile receiving antenna normally used only for receiving rf transmissions within the first frequency band to also be used for sending and receiving rf transmissions within the second frequency band.
REFERENCES:
patent: 2855508 (1958-10-01), Barlow et al.
patent: 3725942 (1973-04-01), Ukmar
Friedman - "Antenna Duplexer" in Electronics Illustrated, Fawcett, Greenwich, Conn., Mar. 1962, vol. 5, No. 2; pp. 66, 67, 108, 110.
Nussbaum Marvin
Smith Alfred E.
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