Portable radio antenna

Details Portable radio antenna Portable radio antenna

1977-08-29

1979-02-06

Smith, Alfred E.

Communications: radio wave antennas

Antennas

With radio cabinet

343825, 343829, 343844, H01Q 124, H01Q 904, H01Q 938, H01Q 2100

Patent

active

041386817

ABSTRACT:
An antenna for a hand-held radio transceiver includes first and second elements extending from the radio's case. The first element is comprised of a pair of series coupled members having electrical lengths of one-half and one-quarter wavelength, respectively, with the free end of the second member being coupled to the transmitter output. The second element couples to the radio's electrical ground and is configured to form a transmission line with the second member. The effective electrical length of the second element, including the influence of the elements parasitic coupling to the radio, is adjusted to be one-quarter wavelength.
The resulting antenna structure minimizes surface currents across the radio's body, thereby substantially eliminating power loss caused by absorption in the user's body.

REFERENCES:
patent: 2153392 (1939-04-01), Berndt
patent: 2205358 (1940-06-01), Hansell
patent: 2505751 (1950-05-01), Bolljahn
patent: 3579241 (1971-05-01), Antista et al.

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