一种多叉指换能器输入可调表面声波滤波器。
A multi-IDT input tunable surface acoustic wave filter.
作者信息
Zhu J, Emanetoglu N W, Lu Y, Kosinski J A, Pastore R A
机构信息
Motorola Inc, Piscataway, NJ 08854, USA.
出版信息
IEEE Trans Ultrason Ferroelectr Freq Control. 2001 Sep;48(5):1383-8. doi: 10.1109/58.949747.
Tunable surface acoustic wave (SAW) filters (TSF) have been widely used in the wireless telecommunication systems. A prototype of a multi-IDT (interdigital transducer) input TSF has been developed. The device consists of 11 IDT paralleled in the SAW propagation path. Different SAW filter configurations are realized by selecting or combining various IDTs, resulting in the tunability of both center frequency and 3 dB bandwidth. The center frequencies of the SAW filter range from 126.8 to 199.1 MHz; the 3 dB bandwidths range from 15.2 to 58.9 MHz. Impedance weighting methods have been applied. The passband ripple has been reduced from 6.44 to 1.37 dB after resistance weighting.
可调谐表面声波（SAW）滤波器（TSF）已广泛应用于无线通信系统中。已开发出一种多叉指换能器（IDT）输入TSF的原型。该器件由11个在SAW传播路径中并联的IDT组成。通过选择或组合各种IDT可实现不同的SAW滤波器配置，从而实现中心频率和3 dB带宽的可调谐性。SAW滤波器的中心频率范围为126.8至199.1 MHz；3 dB带宽范围为15.2至58.9 MHz。已应用阻抗加权方法。电阻加权后，通带纹波已从6.44 dB降低至1.37 dB。
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