H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/40, 351/57,
H03H 7/01 (2006.01) H03H 7/46 (2006.01)
Patent
CA 1066372
Abstract of the Disclosure A radio frequency coupler comprising a first ter- minal for interconnection with a conventional automobile receiving antenna used for receiving rf transmissions within a first radio-frequency band, a second terminal for inter- connection 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 dif- ferent 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 con- nected in the second rf transmission path and tuned to reso- nate at a frequency within the second band so that rf trans- missions 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 electri- cal 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 elec- trical ground and the impedance of the third resonant cir- cuit 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 receiv- ing rf transmissions within the first frequency band to also be used for sending and receiving rf transmissions within the second frequency hand.
273110
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