发明授权
US07277063B2 Variable directivity antenna and variable directivity antenna system using the antennas
失效
可变方向性天线和可变方向性天线系统使用天线
- 专利标题： Variable directivity antenna and variable directivity antenna system using the antennas
- 专利标题（中）： 可变方向性天线和可变方向性天线系统使用天线
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申请号： US10550885申请日： 2004-04-01
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公开(公告)号： US07277063B2公开(公告)日： 2007-10-02
- 发明人: Toshiaki Shirosaka , Shingo Fujisawa , Toshio Fujita , Kiyotaka Tatekawa , Eiji Shibuya
- 申请人： Toshiaki Shirosaka , Shingo Fujisawa , Toshio Fujita , Kiyotaka Tatekawa , Eiji Shibuya
- 申请人地址： JP Kobe-Shi
- 专利权人： DX Antenna Company, Limited
- 当前专利权人： DX Antenna Company, Limited
- 当前专利权人地址： JP Kobe-Shi
- 代理机构： Duane Morris LLP
- 优先权： JP2003-099639 20030402
- 国际申请： PCT/JP2004/004793 WO 20040401
- 国际公布： WO2004/091043 WO 20041021
- 主分类号： H01Q1/50
- IPC分类号： H01Q1/50
摘要：
Folded dipole antenna elements (2, 4) are disposed generally in parallel, being spaced by a distance smaller than a half of the wavelength employed. The antenna elements (2, 4) are connected to a combiner (16) via feeders (12, 14) having different lengths. The difference in length between the feeders (12, 14) is such that received signals resulting from a radio wave coming to the antenna elements (2, 4) from the front and received by the antenna elements (12, 14) are in phase with each other at the inputs (16a, 16b) of the combiner (16), whereas received signals resulting from a radio wave coming to the antenna elements (2, 4) from the back and received by the antenna elements (12, 14) are 180° out of phase with each other at the inputs (16a, 16b) of the combiner (16).