Radio antennas

Details Radio antennas Radio antennas

1992-03-12

1994-05-31

Hajec, Donald

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343901, H01Q 124

Patent

active

053173252

ABSTRACT:
A radio antenna has an antenna element 12 which is slidable with respect to a casing of the radio between an extended position (FIG. 5) and a retracted position. In the extended position, a metal plate 15 on the lower end of the antenna element 12 cooperates with a fixed dielectric 17 and a fixed metal plate 17 to form a capacitor providing a signal link to a coaxial cable 18 leading to a matching network. This avoids the need for a sliding metal connection, as in the prior art. In the retracted position of the antenna element 12, the capacitive link is effectively disconnected.

REFERENCES:
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4725845 (1988-02-01), Phillips
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4916456 (1990-04-01), Shyu

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