Communications: radio wave antennas – Antennas – Microstrip
Patent
1994-07-22
1996-08-20
Le, Hoanganh
Communications: radio wave antennas
Antennas
Microstrip
343769, 343846, H01Q 138
Patent
active
055482970
ABSTRACT:
The present invention relates to a compact, lightweight microstrip antenna that operates at two frequencies that are widely different. On a dielectric substrate are formed an element consisting of an annular conductive pattern, wherein a central edge side thereof is short-circuited to a ground electrode, and an element consisting of a circular conductive pattern within the annular conductive pattern. The circular conductive pattern is accommodated within the annular conductive pattern. The two antennas operate at different frequencies, with the element formed by the annular conductive pattern resonating in TM.sub.11 mode and the element formed of the circular pattern resonating in the TM.sub.01 mode. An antenna capable of being used in common by systems with widely different frequency bands, such as the GPS and VICS, is thus obtained.
REFERENCES:
patent: 4821040 (1989-04-01), Johnson et al.
patent: 5006859 (1991-04-01), Wong et al.
Arai Hiroyuki
Le Hoang-anh
Toko Kabushiki Kaisha
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