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1. 发明授权

US5883575A RF-tags utilizing thin film bulk wave acoustic resonators 失效
标题翻译：使用薄膜体声波谐振器的RF标签
公开(公告)号：US5883575A
公开(公告)日：1999-03-16
申请号：US909677
申请日：1997-08-12
申请人： Richard C. Ruby , Philip Canfield
发明人： Richard C. Ruby , Philip Canfield
IPC分类号： G08B13/24 , H03H9/17 , H03H9/58 , G08B13/14
CPC分类号： H03H9/585 , G08B13/2414 , G08B13/2417 , G08B13/2422 , G08B13/2431 , G08B13/2437 , G08B13/2442 , H03H9/171 , H03H9/586
摘要： An RF tag having an antenna for receiving a RF signal having a frequency band between first and second frequencies and an acoustical resonator having a resonant frequency related to the first and second frequencies. The acoustical resonator has first and second electrodes that sandwich a layer of piezoelectric material. The antenna is connected to one of these electrodes. The resonator filters the signal received on the antenna. The filter can function either as a notch filter or as a bandpass filter. A resonator that acts as a bandpass filter includes a third electrode and a second layer piezoelectric material sandwiched between the second electrode and the third electrode. A frequency multiplier circuit may be incorporated in the RF tag to provide a response signal that occupies a frequency band at a frequency above the second frequency. In one embodiment of the present invention, multiple resonators having different resonant frequencies are utilized to generate a response code. In one embodiment of the present invention, the resonators are suspended on a support member over a substrate at locations on the support member which differ in thickness.
摘要翻译：一种具有用于接收具有第一和第二频率之间的频带的RF信号的天线的RF标签和具有与第一和第二频率相关的共振频率的声学谐振器。声谐振器具有夹着压电材料层的第一和第二电极。天线连接到这些电极之一。谐振器对天线上接收到的信号进行滤波。滤波器可以用作陷波滤波器或带通滤波器。用作带通滤波器的谐振器包括夹在第二电极和第三电极之间的第三电极和第二层压电材料。频率乘法器电路可并入RF标签中以提供以高于第二频率的频率占据频带的响应信号。在本发明的一个实施例中，利用具有不同谐振频率的多个谐振器来产生响应码。在本发明的一个实施例中，谐振器在不同厚度的支撑构件上的位置处悬挂在基板上的支撑构件上。

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