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公开(公告)号：EP0255195A2
公开(公告)日：1988-02-03
申请号：EP87302122.4
申请日：1987-03-12
发明人： Wright, Peter V
CPC分类号： H03H9/6409
摘要： A notch filter includes a quadrature coupler (26) having first, second, third, and fourth terminals (28,30,32,34), the first terminal being a signal input terminal and the fourth terminal being a signal output terminal. A first tuned surface acoustic wave (SAW) device (10), coupled to the second terminal, receives the input signal with 0° phase shift, and a second tuned SAW device (10), coupled to the third terminal, receives the input signal with a 90° phase shift. Each SAW device has primarily reactive characteristics at signal frequencies higher or lower than the notch region and primarily resistive characteristics across the notch region. Each tuned surface acoustic wave device comprises a SAW impedance element (12) having an input admittance which is substantially constant in both magnitude and phase over a predetermined band width across the notch region and an inductor (14) tuning the SAW element. The quadrature coupler preferably comprises four inductors (36,38,40,42) which are serially connected to form a continuous circuit. A respective one of first to fourth terminals is coupled to a junction between a respective pair of the serially-connected inductors, and a respective capacitance (52) is coupled between each of the terminals and a ground potential.
摘要翻译： 陷波滤波器包括具有第一，第二，第三和第四端子（28,30,32,34）的正交耦合器（26），第一端子是信号输入端子，第四端子是信号输出端子。 耦合到第二端子的第一调谐表面声波（SAW）器件（10）接收具有0°相移的输入信号，并且耦合到第三端子的第二调谐SAW器件（10）接收输入信号 90°相移。 每个SAW器件在高于或低于陷波区域的信号频率处具有主要的无功特性，并且主要是跨越陷波区域的电阻特性。 每个调谐的声表面波器件包括SAW阻抗元件（12），该SAW阻抗元件（12）具有输入导纳，该输入导纳在跨越该缺口区域的预定带宽上的幅度和相位两者基本恒定，以及调谐SAW元件的电感器（14）。 正交耦合器优选地包括四个电感器（36,38,40,42），其串联连接以形成连续电路。 第一至第四端子中的相应一个耦合到相应的一对串联电感器之间的结，并且相应的电容（52）耦合在每个端子和接地电位之间。
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公开(公告)号：EP0255195A3
公开(公告)日：1989-03-15
申请号：EP87302122.4
申请日：1987-03-12
发明人： Wright, Peter V
CPC分类号： H03H9/6409
摘要： A notch filter includes a quadrature coupler (26) having first, second, third, and fourth terminals (28,30,32,34), the first terminal being a signal input terminal and the fourth terminal being a signal output terminal. A first tuned surface acoustic wave (SAW) device (10), coupled to the second terminal, receives the input signal with 0° phase shift, and a second tuned SAW device (10), coupled to the third terminal, receives the input signal with a 90° phase shift. Each SAW device has primarily reactive characteristics at signal frequencies higher or lower than the notch region and primarily resistive characteristics across the notch region. Each tuned surface acoustic wave device comprises a SAW impedance element (12) having an input admittance which is substantially constant in both magnitude and phase over a predetermined band width across the notch region and an inductor (14) tuning the SAW element. The quadrature coupler preferably comprises four inductors (36,38,40,42) which are serially connected to form a continuous circuit. A respective one of first to fourth terminals is coupled to a junction between a respective pair of the serially-connected inductors, and a respective capacitance (52) is coupled between each of the terminals and a ground potential.
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公开(公告)号：EP0255195B1
公开(公告)日：1992-09-02
申请号：EP87302122.4
申请日：1987-03-12
发明人： Wright, Peter V
CPC分类号： H03H9/6409
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