James P Durante

US Patent:

41386817, Feb 6, 1979

Filed:

Aug 29, 1977

Appl. No.:

5/828565

Inventors:

Allen L. Davidson - Crystal Lake IL
James M. Durante - Elgin IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 124
H01Q 904
H01Q 938
H01Q 2100

US Classification:

343702

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.