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    • 86. 发明专利
    • Receiver
    • 接收器
    • JP2005328192A
    • 2005-11-24
    • JP2004142753
    • 2004-05-12
    • Denso Corp株式会社デンソー
    • WATABE NOBUYA
    • H01Q1/24H01Q11/12H04B1/04H04B1/18H04B1/44H04N5/44
    • H04B1/18H01Q1/243H04B1/0458
    • PROBLEM TO BE SOLVED: To execute simply and exactly the impedance matching of an antenna individually for every device without sacrificing an antenna gain in a receiver with a built-in antenna.
      SOLUTION: An impedance matching circuit 3 uses a variable capacity diode D. The amplitude of the reverse bias voltage applied to the variable capacity diode D can be set arbitrarily by a D/A converter 9. When the mode of operation is a regulation mode, while changing the reverse bias voltage generated from the D/A converter 9, the signal level of an RSSI signal is measured, and the input data of the D/A converter 9 are measured, and the input data of the D/A converter 9 when the measured result becomes the maximum are stored as regulating data in an EEPROM 13. The reverse bias voltage in response to the regulating data is applied to the variable capacity diode D by reading the regulating data stored in the EEPROM 13, and setting as the input data of the D/A converter 9.
      COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:为了每个设备单独执行天线的阻抗匹配,而不会牺牲具有内置天线的接收机中的天线增益。 阻抗匹配电路3使用可变容量二极管D.施加到可变容量二极管D的反向偏置电压的幅度可以由D / A转换器9任意设定。当操作模式为 调节模式,在改变从D / A转换器9产生的反向偏置电压的同时,测量RSSI信号的信号电平,并且测量D / A转换器9的输入数据,并且D / 当测量结果变为最大值时,A转换器9作为调节数据存储在EEPROM 13中。响应于调节数据的反向偏置电压通过读取存储在EEPROM 13中的调节数据而被施加到可变容量二极管D,以及 设置为D / A转换器9的输入数据。版权所有(C)2006,JPO&NCIPI
    • 88. 发明专利
    • JP2002529948A
    • 2002-09-10
    • JP2000580268
    • 1999-10-14
    • H01Q3/30H01Q7/00H01Q11/12H01Q21/24
    • A rotating field antenna is provided which includes a figure eight shape loop, a center loop magnetically coupled to the figure eight shape loop, and a drive element for driving the figure eight loop. The figure eight shape loop has an upper loop, a lower loop and a crossover region therebetween. The center loop overlaps at least a portion of the crossover region and at least a portion of one or both of the upper and lower loops. The center loop has no direct or physical electrical connection to the offset figure eight shape loop. Magnetic induction produces a 90-degree phase difference between the phase of the figure eight loop and the phase of the center loop. The antenna thereby produces a rotating composite field when driven by the drive element. The figure eight loop and the center loop are coplanar. The drive element may be an amplified voltage source which has a fundamental frequency of about 13.56 MHz, thereby providing a multiple loop antenna which is useful for electronic article surveillance systems that use RFID tags which resonate at 13.56 MHz.