发明授权
US07373169B2 Earphone antenna and portable radio equipment provided with earphone antenna
有权
提供耳机天线的耳机天线和便携式无线电设备
- 专利标题: Earphone antenna and portable radio equipment provided with earphone antenna
- 专利标题(中): 提供耳机天线的耳机天线和便携式无线电设备
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申请号: US11144572申请日: 2005-06-03
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公开(公告)号: US07373169B2公开(公告)日: 2008-05-13
- 发明人: Yoshitaka Yoshino
- 申请人: Yoshitaka Yoshino
- 申请人地址: JP
- 专利权人: Sony Corporation
- 当前专利权人: Sony Corporation
- 当前专利权人地址: JP
- 代理机构: Lerner, David, Littenberg, Krumholz & Mentlik, LLP
- 优先权: JPP2004-167551 20040604
- 主分类号: H04M1/00
- IPC分类号: H04M1/00
摘要:
An earphone antenna includes an audio signal transmission path formed by connecting a first shield wire of a coaxial cable to a ground, connecting a central conductor of the coaxial cable to a pair of first signal lines of an earphone cable via a capacitor which exhibits high impedance in a frequency range of audio signals and low impedance in a frequency range of high frequency signals, and connecting a second signal line and a grounding wire, respectively, to the pair of first signal lines via a high frequency choke which exhibits low impedance in the frequency range of audio signals and high impedance in the frequency range of high frequency signals. Connecting the second shield wire to the ground causes formation of a sleeve antenna by the earphone cable and the second shield wire.