| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device provided with a transmission antenna and a reception antenna formed on a dielectric substrate, which is capable of greatly improving isolation between the transmission antenna and the reception antenna with a simple structure in comparison with conventional techniques, and to provide a structure thereof. SOLUTION: In the antenna device with the transmission antenna and the reception antenna formed on the dielectric substrate, at least a pair of via conductors which are spaced from each other by a prescribed distance and face each other are formed between the transmission antenna and the reception antenna on the dielectric substrate, and one end of one of the pair of via conductors is grounded, and the pair of via conductors constitute an LC series resonance circuit, and the size of each via conductor and the distance are set so that the LC series resonance circuit may series-resonate to a radio frequency of a transmission signal transmitted from the transmission antenna. COPYRIGHT: (C)2009,JPO&INPIT
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