Zhongmao Li

By Zhongmao Li, Mengjie Qin, Pengzhan Liu and Xin Qiu

With the development of microwave wireless communication technology, microwave passive frequency selectivity circuits are developing toward multi-function and miniaturization. Substrate-integrated waveguide (SIW) devices have good development prospects in miniaturization and integration. The research on devices based on SIW is lack unified theoretical combing. This chapter describes the novel circuits based on substrate-integrated waveguide, including filter, power divider, switch, phase shifter, diplexer, and crossover. This chapter describes the design methods and special properties of these circuits. The display of these circuits is expected to give some inspiration to your research.

Part of the book: Hybrid Planar

By Zhongmao Li, Mengjie Qin, Lanlan Liao, Xiaozhuang Hu, Pengzhan Liu, Xin Qiu and Zhiqiang Li

There have been many types of filters for various communication implications such as surface acoustic wave (SAW) filters, bulk wave (BAW) filters, transmission line filters, cavity filters, substrate integrated waveguide (SIW) filters, etc. As the radio frequency (RF) front end continues to develop, bandpass filters (BPFs) with excellent frequency response and tunability are becoming more and more competitive. In this chapter, three different types are reported, including On-chip-based TBPF, microstrip-based TBPF, and SIW-based TBPF, and some of them are theoretically analyzed carefully. Filters with frequency tuning, bandwidth tuning, and transmission zeros tuning are shown comprehensively. In addition, the limitations and future trends of tunable microwave filters are objectively expounded.

Part of the book: Microwave Technologies