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    • 1. 发明授权
    • Back fire helical antenna
    • 背火螺旋天线
    • US5346300A
    • 1994-09-13
    • US907137
    • 1992-07-01
    • Hirohiko YamamotoKeijirou HigashiHiroyuki TakebeHiroshi NakanoTomozo Ohta
    • Hirohiko YamamotoKeijirou HigashiHiroyuki TakebeHiroshi NakanoTomozo Ohta
    • H01Q11/08H01Q1/36
    • H01Q11/08
    • A first radiation member 165 includes radiation conductors 166 and 167, an arm 168 and a lower connection piece 169 all integrally formed by blanking. A stub 170 is likewise integrally formed on radiation conductor 166. A second radiation member 171 includes radiation conductors 172 and 173, an arm 174 and a lower connection piece 175 all integrally formed by blanking. A stub 176 is likewise integrally formed on radiation conductor 173. A first loop comprised of radiation conductors 167 and 172, arms 168 and 174 and lower connection pieces 169 and 175 exhibits capacitive impedance at a wavelength for use. The overall length of a second loop comprised of radiation conductors 166 and 173, arms 168 and 174 and lower connection pieces 169 and 175 is set equal to that of the first loop. The second loop, however, exhibits inductive impedance at the wavelength for use by adjustment of the length of stubs 170 and 176. Adjusting stubs 170 and 176 enable control of a phase of a current flowing through the second loop.
    • 第一辐射构件165包括通过消隐一体形成的辐射导体166和167,臂168和下连接件169。 短截线170同样整体地形成在辐射导体166上。第二辐射构件171包括辐射导体172和173,臂174和下连接件175,所述臂174和下连接片175通过消隐整体形成。 短截线176同样整体地形成在辐射导体173上。由辐射导体167和172,臂168和174以及下连接片169和175组成的第一回路在使用的波长处表现出电容性阻抗。 包括辐射导体166和173,臂168和174以及下连接件169和175的第二回路的总长度被设定为等于第一回路的总长度。 然而,第二回路在波长处显示出通过调整短截线170和176的长度来使用的电感阻抗。调节短线170和176使得能够控制流经第二回路的电流的相位。
    • 4. 发明申请
    • Radio communication system
    • 无线通信系统
    • US20050156806A1
    • 2005-07-21
    • US10505129
    • 2003-02-20
    • Tomozo OhtaHiroshi NakanoTohru Izaki
    • Tomozo OhtaHiroshi NakanoTohru Izaki
    • G06K7/08G06K7/10H01Q19/10
    • G06K7/10346G06K7/10178G06K7/10336
    • An RFID system (10) has an interrogator (11), an interrogator antenna (12) connected to the interrogator (11), for transmitting a signal, a radio wave reflecting plate (21) reflecting the signal transmitted from the interrogator antenna (12) and including a part of a parabolic curve or a curve similar thereto, and a radio frequency tag (13) responding an receiving the signal from the interrogator antenna (12) via at least the radio wave reflecting plate (21) and communicating with the interrogator (11). A signal having passed without being applied to the radio frequency tag (13) is reflected toward the inside of the radio wave reflecting plate (21) by the radio wave reflecting plate (21). Therefore, the signal is prevented from scattering, so that the signal from the interrogator antenna (12) is effectively utilized.
    • RFID系统(10)具有询问器(11),连接到询问器(11)的询问器天线(12),用于发送信号;电波反射板(21)反映从询问器天线(12 ),并且包括抛物线曲线或类似曲线的一部分,以及响应于至少通过无线电波反射板(21)从询问器天线(12)接收信号并与其通信的射频标签(13) 询问器(11)。 没有施加到射频标签(13)的信号已被无线电波反射板(21)反射到无线电波反射板(21)的内部。 因此,防止信号散射,从而有效地利用来自询问器天线(12)的信号。