Apparatus for connecting a radiotelephone to an external antenna

Details Apparatus for connecting a radiotelephone to an external antenna Apparatus for connecting a radiotelephone to an external antenna

1996-07-17

1998-10-13

Faile, Andrew I.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455 90, 455129, 343702, H04B 138

Patent

active

058227059

ABSTRACT:
The present invention concerns an apparatus for connecting a radio frequency signal between the integral antenna of the radio communication device and the external antenna, preferably a car antenna. The apparatus in accordance with the invention comprises a resonant element, preferably a helical coil conductor having an electromagnetic coupling with the antenna of the radio communication device and its first connection point being coupled capacitatively with the ground plane of the radio communication device and its second connection point being connected with a coaxial conductor to said external antenna. The apparatus in accordance with the invention further comprises a matching element, preferably a helical coil conductor coupled electromagnetically to said antenna and said resonant element.

REFERENCES:
patent: 4521784 (1985-06-01), Nemet
patent: 4660047 (1987-04-01), Wolfson et al.
patent: 4661992 (1987-04-01), Garay et al.
patent: 5155494 (1992-10-01), Bryant et al.

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