Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2005-09-20
2005-09-20
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S702000, C343S895000
Reexamination Certificate
active
06946994
ABSTRACT:
The present invention relates mainly to a small dielectric antenna capable of obtaining a good VSWR characteristic even if it is placed in the vicinity of a grounding pattern when mounted on a circuit board. A dielectric antenna is formed in which a feed point of an antenna element13having a resonance frequency set to a first frequency in a first frequency band and a feed point of an antenna element14having a resonance frequency set to a second frequency are connected to an external feed terminal12b, and an open stub15connected to the antenna element14in the vicinity of the feed point. The open stub15is provided to enable resonance at each of frequencies to be used while the lengths of the antenna elements13and14are shorter than ordinary lengths determined according to the wavelengths of the frequency to be used. Further, even in the case of placement in the vicinity of a grounding conductor pattern3at the time of mounting on a circuit board1, the frequency bandwidth through which a good VSWR characteristic can be obtained in a used frequency band can be extended.
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Amano Takashi
Imaizumi Tatsuya
Kobayashi Naoto
Maekawa Kazuya
Okado Hironori
Le Hoang-anh
Lowe Hauptman & Berner LLP
Taiyo Yuden Co. Ltd.
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