Название: RF & Microwave Multi-mode and Tunable Filters
Автор: Fushun Nian, Dinghong Jia, Xiaoguo Huang, Shengjun Wei
Издательство: Springer
Год: 2026
Страниц: 148
Язык: английский
Формат: pdf (true), epub
Размер: 53.8 MB

This book focuses primarily on RF and microwave tunable filters. It addresses the design methods and validated examples of various types of tunable filters. It provides an in-depth study of several major topics, such as multi-mode filters, bandwidth control, passband control, tunable multiband filters, and bandstop tunable filters. The book's comprehensive and systematic treatment of tunable filter issues is one of its major features and makes it particularly suited for readers interested in designing configurable RF and microwave front-end modules and systems. This book will benefit researchers, engineers, and graduate students in wireless communication, radar, and related fields.

Filters are key components in radio frequency (RF) and microwave systems that can selectively process signals of specific frequencies. By designing specific circuits or structures, they allow signals within the target frequency range to pass through smoothly while significantly attenuating or suppressing other unwanted frequency components. Their core function is to precisely separate useful signals from interference signals. For example, in communication systems, they filter out spurious interference from adjacent channels; in radar systems, they suppress noise to improve target detection sensitivity; and in test and measurement, they ensure signal purity to guarantee data accuracy. The importance of filters lies in their role to maintain the performance of RF and microwave systems. Without high-performance filters, systems may suffer from a decrease in signal-to-noise ratio, an increase in communication bit error rate, functional failure, or even complete paralysis due to various interferences. Filters directly determine the signal quality, operational stability, and application reliability of the entire system, and are an indispensable core component in everything from basic electronic devices to complex aerospace systems.

The book focuses on the design and verification of multimode and tunable filters in the RF and microwave frequency bands and is divided into seven chapters. Chapter 1 mainly sorts out and introduces the research background and various types of multimode and tunable filters. Chapter 2 focuses on the classification, theoretical derivation, and design verification of filters based on multimode resonators. Chapter 3 classifies and introduces tunable filters with controllable bandwidth. Chapter 4 presents the classification of tunable multi-bandpass filters. Chapter 5 focuses on the classification of tunable bandstop filters. Chapter 6 introduces the tunable frequency selective surface, a device with spatial filtering characteristics. Chapter 7 provides a systematic summary of the entire book and prospects for the future.