Communications: radio wave antennas – Antennas – Microstrip
Patent
1982-09-03
1985-08-27
Lieberman, Eli
Communications: radio wave antennas
Antennas
Microstrip
455277, H01Q 138
Patent
active
045381534
ABSTRACT:
An improved diversity communication system which has a single micro-strip antenna has been found. The micro-strip antenna according to the invention comprises a thin dielectric layer sandwiched by a ground conductor plane and a radiation conductor plane, a pair of feed points on the radiation conductor plane through the holes on the ground conductor plane, and said feed points being positioned so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane. Each of the feed points is coupled with each branch input of a diversity receiver, and those feed points operate like separated two antennas, which have a pair of perpendicular directivities. Preferably, a radiation conductor plane is circular with a plurality of slots along the periphery of the same. The feed points of the present micro-strip antenna have little correlation between the same. The present invention is advantageous in particular for mobile communication as the size and/or the height of the antenna is small, and the antenna may be mounted in a housing of a receiver itself.
REFERENCES:
patent: 3478362 (1969-11-01), Ricardi et al.
patent: 4125838 (1978-11-01), Kaloi
patent: 4125839 (1978-11-01), Kaloi
patent: 4318107 (1982-03-01), Pierrot et al.
IEEE Transactions on Antennas and Propagation, vol. AP-29, No. 1, Jan. 1981.
Lieberman Eli
Nippon Telegraph & Telephone Public Corp.
Ohralik K.
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