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Surface-acoustic-wave filters with poles of attenuation created by impedance circuits
Surface-acoustic-wave filters with poles of attenuation created by impedance circuits
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机译:由阻抗电路产生衰减极点的表面声波滤波器
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摘要
A surface-acoustic-wave filter couples a two-port surface-acoustic-wave resonator filter circuit coupled in parallel or in series with a two-port impedance circuit. The two-port impedance circuit has an impedance that creates a pole of attenuation, by making the open-circuit impedance of the surface-acoustic-wave filter equal to the short-circuit impedance. High attenuation over a wide range of stopband frequencies is obtained in this way, combined with steep roll-off between the passband and stopband.
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