具有阻抗转换的平衡低损耗纵向耦合双模谐振器锯滤波器

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI:10.1109/FREQ.2008.4622989

S. Doberstein

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引用次数: 5

摘要

本文提出了一种新的宽带平衡低损耗声波滤波器，其阻抗转换范围从50-100 ω到200-300 ω，宽分数带宽为2-6%。42度YX LiTaO3、64度YX和41度YX LiNbO3两种类型的纵向耦合双模谐振器滤波器用于此目的。第一种滤波器采用双传感器方案实现。第二类滤波器采用三换能器方案。双换能器滤波器中的阻抗转换由一个分段输出换能器提供。三换能器滤波器中的阻抗转换是通过侧换能器的串联来实现的。利用等效电路模型对声波滤波器的优化进行了计算机仿真。平衡SAW滤波器的240-361 MHz采样显示插入损耗为2-3 dB，阻带衰减为20-50 dB。过滤器安装在5x5x1.35 mm的SMD封装中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Balanced low-loss longitudinally-coupled double-mode resonator saw filters with impedance conversion

This paper presents the new wideband balanced low-loss SAW filter with impedance conversion from 50-100 Omega to 200-300 Omega in a wide fractional bandwidth of 2-6%. The two types of the longitudinally-coupled double-mode resonator filters on 42deg YX LiTaO3, 64deg YX and 41deg YX LiNbO3 are used for this purpose. The first type of the filters is realized as a two-transducer scheme. The second type of the filters is built as the three-transducer scheme. The impedance conversion in the two-transducer filters is provided by a sectional output transducer. The impedance conversion in the three-transducer filters is attained by a series connection of the side transducers. The optimization of a SAW filter is provided with a computer simulation using an equivalent circuit model. The 240-361 MHz samples of the balanced SAW filters have shown an insertion loss of 2-3 dB, stopband attenuation of 20-50 dB. The filters were housed in the 5x5x1.35 mm SMD packages.

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2008 IEEE International Frequency Control Symposium

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