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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >SAW integrated modules for 800-MHz cellular radio portable telephones with new frequency allocations
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SAW integrated modules for 800-MHz cellular radio portable telephones with new frequency allocations

机译：具有新频率分配的用于800 MHz蜂窝无线便携式电话的SAW集成模块

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摘要

Several technologies are developed to achieve broader band surface-acoustic-wave (SAW) filters for portable telephones used in an 800-MHz wideband (25-MHz) cellular radio system. The design and realization of a transmitter final stage filter (high-power filter) and a prefilter (high-performance filter) are examined from initial specification to final device operation. An insertion loss of less than 2 dB and a rejection level of more than 20 dB are achieved for the final stage filter, and less than 5 dB and more than 50 dB, respectively, are achieved for the prefilter. Two integrated SAW modules, an antenna duplexer and a high-power amplifier, that include the above SAW filters and satisfy almost all requirements for wideband cellular radio have been developed. Their physical dimensions are the same as those of previously developed 20-MHz models. New SAW electrode materials (Al+Ni, Al+Cu+Ni) have also been investigated to improve the power-handling characteristics of the transmitter final stage filter.
机译：已开发出多种技术来实现用于800 MHz宽带（25 MHz）蜂窝无线系统中的便携式电话的宽带表面声波（SAW）滤波器。从最初的规格到最终的设备操作，都对发射机末级滤波器（大功率滤波器）和前置滤波器（高性能滤波器）的设计和实现进行了研究。对于最终级滤波器，插入损耗小于2 dB，抑制水平大于20 dB，对于预滤波器，分别小于5 dB和大于50 dB。已经开发出两个集成的SAW模块，一个天线双工器和一个高功率放大器，其中包括上述SAW滤波器，几乎可以满足宽带蜂窝无线电的所有要求。它们的物理尺寸与以前开发的20 MHz型号相同。还研究了新的SAW电极材料（Al + Ni，Al + Cu + Ni）以改善发射器末级滤波器的功率处理特性。

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