发明授权
- 专利标题： Antenna tuning circuit
- 专利标题（中）： 天线调谐电路
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申请号： US895963申请日： 1978-04-13
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公开(公告)号： US4186350A公开(公告)日： 1980-01-29
- 发明人: Kazuo Takayama
- 申请人： Kazuo Takayama
- 申请人地址： JPX Kobe
- 专利权人： Fujitsu Ten Limited
- 当前专利权人： Fujitsu Ten Limited
- 当前专利权人地址： JPX Kobe
- 优先权： JPX52-44695 19770419; JPX52-100032 19770819; JPX52-100033 19770819
- 主分类号： H03J3/18
- IPC分类号： H03J3/18 ; H04B1/18 ; H04B1/10
摘要：
An antenna tuning circuit of the type having a first variable capacitance diode connected in parallel with a coil to form a resonance circuit and a second variable capacitance diode through which the resonance circuit is connected to an antenna, in which the connection position of the first variable capacitance diode to the coil is adapted to be changed for the reduction in the image interference ratio. Reductions in the maximum capacitance and the ratio between the maximum capacitance and the minimum capacitance required for the variable capacitance diodes are also intended by the connection of a third variable capacitance diode to the antenna side of the second variable capacitance diode.
公开/授权文献
- US5759136A Exerciser having movable foot supports 公开/授权日：1998-06-02
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