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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Investigation of new low-loss and high-power SAW filters for reverse-frequency-allocated cellular radios
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Investigation of new low-loss and high-power SAW filters for reverse-frequency-allocated cellular radios

机译：用于反向分配蜂窝无线电的新型低损耗，高功率SAW滤波器的研究

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摘要

Japanese cellular radios employ reverse frequency-allocations of the transmitter and receiver frequency bands. A rather narrowband surface acoustic wave (SAW) transmitter prefilter and a new type of SAW low-loss and high-power transmitter final stage filter-dual configurations to previously developed US cellular radio system filter-have been developed. The dual configurations provide the stopbands for the filter at the lower side of the pass bands, which is a requirement for reverse frequency-allocation systems. Design procedures, including those for the piezoelectric substrates and the experimental results obtained for the filters of 1.5 dB low insertion-loss and over 30 dB stop band rejection at 920 MHz, are also presented. In addition, the frequency characteristics of the SAW antenna duplexer module used in Japanese new common carrier (NCC) systems are discussed.
机译：日本的蜂窝无线电采用发射机和接收机频带的反向频率分配。已经开发了相当窄带的表面声波（SAW）发射器预滤波器和新型的SAW低损耗和高功率发射器末级滤波器-与先前开发的美国蜂窝无线电系统滤波器双重配置。双重配置在通带的较低侧为滤波器提供了阻带，这是反向频率分配系统的要求。还介绍了设计程序，包括压电基板的设计程序，以及在920 MHz时具有1.5 dB的低插入损耗和超过30 dB的阻带​​抑制比的滤波器所获得的实验结果。此外，还讨论了在日本新公共载波（NCC）系统中使用的SAW天线双工器模块的频率特性。

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