Communications: radio wave antennas – Antennas – Slot type
Patent
1996-09-05
1999-06-22
Tokar, Michael
Communications: radio wave antennas
Antennas
Slot type
343700MS, 343771, H01Q 1310
Patent
active
059146931
ABSTRACT:
A coaxial resonant slot antenna having a novel structure is provided to further reduce the dimensions of radio terminals incorporating such an antenna. Also provided are a novel method of fabricating such a coaxial resonant slot antenna and a radio terminal having a novel structure using such a coaxial resonant slot antenna. An entire strip conductor is arranged inside a flat conductive cubic such that the strip conductor is insulated from the conductive cubic. A connection point between the strip conductor and a radio frequency transmission line is provided at a position about 1/4 of wavelength away from one end of the strip conductor. A slot is shaped into a narrow rectangle, a generally upside-down "U", or a generally upside-down "U" having another slot on each end. It is desired that the center slot crosses the strip conductor along the length thereof and in the height direction thereof, the distance between the ends being equivalent to about 1/2 of wavelength used. The radio terminal has a plurality of antennas associated with the present invention arranged on a plurality of surfaces and provides a connection mechanism for varying the number of antennas to be used in the talk mode and the standby mode.
REFERENCES:
patent: 3599187 (1971-08-01), Bobeck
patent: 4063246 (1977-12-01), Greiser
patent: 4197545 (1980-04-01), Favaloro
patent: 4494083 (1985-01-01), Josefsson et al.
patent: 4724443 (1988-02-01), Nysen
patent: 5231407 (1993-07-01), McGirr et al.
patent: 5337065 (1994-08-01), Bonnet et al.
Hori Kazuyuki
Imakado Yoshitaka
Kishida Hiroshi
Kuwahara Mikio
Nomura Tomonori
Duong Qui Van
Hitachi , Ltd.
Tokar Michael
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