Mobile radio communication apparatus

Details Mobile radio communication apparatus Mobile radio communication apparatus

1990-12-10

1992-09-15

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With radio cabinet

343700MS, H01Q 124

Patent

active

051481812

ABSTRACT:
A mobile radio communication apparatus with an improved antenna for promoting easy manual operations, insuring desirable acoustic characteristics, and preventing the antenna gain from being lowered by user's head or hand during communication. An antenna is mounted on the upper surface of a casing and made up of a rectangular first conductive plate parallel to and spaced apart from the upper surface by a predetermined distance and having a length L.sub.1, a rectangular second conductive plate extending perpendicularly from the first conductive plate and having a height H.sub.2, and a rectangular third conductive plate extending perpendicularly from the second conductive plate and in parallel to the first conductive plate. A short-circuiting plate extending perpendicularly from one side of the first conductive plate by a height H.sub.1 and has a length M as measured in a direction parallel to the length L.sub.1. The short-circuiting plate has the end thereof connected and affixed to the upper end of a particular surface of the casing where the earpiece, mouthpiece and operation secton are arranged. The height H.sub.1 of the short-circuiting plate is greater than said height H.sub.2 of the second conductive plate, while the length M of the short-circuiting plate is equal to or smaller than the length L.sub.1 of the first conductive plate.

REFERENCES:
patent: 4641366 (1987-02-01), Yokoyama et al.
patent: 4700194 (1987-10-01), Ogawa et al.
patent: 4791423 (1988-12-01), Yokoyama et al.
patent: 4803491 (1989-02-01), Hikuma
patent: 4829591 (1989-05-01), Hashimoto et al.

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