宽带多频射频理论与技术

Broadband multi-frequency radio frequency theory and techniques

摘要

无线移动通信系统的多业务并行趋势导致频率碎片化和射频电路通道数指数级上升，射频电路多频技术已经成为关键难点。该文报告了课题组在宽带多频带理论与方法方面的研究进展，以及相应射频器件的发展路线。首先回顾了多频阻抗匹配理论方法，总结了双频实阻抗、恒定复阻抗以及频变复阻抗这3种情形的匹配方法；在此基础上，进一步介绍了多频无源器件，包括滤波器、功分器、耦合器、天线的设计与电路实现，以及多频有源放大电路设计及其精简线性化方法。目前，双频电路设计和电路构建覆盖了全部有源无源电路，频率间隔在2～3个倍频程以上，双频累计带宽已达1.1 GHz，三频电路设计和电路构建进展明显，实现了多种典型三频有源无源电路。最后，对未来多频带射频技术的发展趋势进行展望。

Abstract

The trend toward parallel multi-service operation in wireless mobile communication systems has led to increasingly fragmented spectrum resources and an exponential rise in the number of RF channels, making multi-band RF circuit techniques a critical challenge. This paper presents the research progress of our group in broadband multi-band theories and methodologies, alongside the developmental roadmap for corresponding RF devices. First, the theoretical framework for multi-band impedance matching is reviewed, summarizing matching techniques for three distinct scenarios: dual-band real impedance, constant complex impedance, and frequency-dependent complex impedance. Building upon this foundation, the design and implementation of multi-band passive components, including filters, power dividers, couplers, and antennas are introduced. Furthermore, the design of multi-band active amplifier circuits and their simplified linearization methods are discussed. Currently, dual-band circuit design and fabrication encompass a comprehensive range of active and passive circuits, featuring frequency separations exceeding two to three octaves and a cumulative dual-band bandwidth of up to 1.1 GHz. Significant progress has also been made in tri-band circuit design and realization, and a variety of representative tri-band active and passive circuits have been implemented. Finally, the paper discusses future development trends in multi-band RF technologies.

关键词

宽带多频 / 射频电路 / 阻抗匹配 / 无源器件 / 有源器件

Key words

broadband multi-frequency / radio frequency circuit / impedance matching / passive device / active device

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基金资助

国家自然科学基金重大项目(62090015)