微带滤波器在射频微波应用中的设计原理

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"《Microstrip Filters for RF Microwave Applications 2nd》是一本深入探讨微带滤波器设计的专业书籍，适合初学者和专业人士参考。该书由JIA-SHENG HONG编写，是WILEY SERIES IN MICROWAVE AND OPTICAL ENGINEERING系列的一部分。书中详细阐述了微带滤波器在射频/微波应用中的设计原理和技术，包括理论、实践和实例分析。" 微带滤波器是无线通信和射频系统中不可或缺的组件，用于抑制不需要的频率成分，提高信号质量。本书第二版针对这一主题提供了全面的覆盖，包括以下关键知识点： 1. **微带滤波器基础**：介绍微带滤波器的基本概念，如传输线理论、谐振器结构和滤波器类型（如低通、高通、带通和带阻滤波器）。 2. **微带线设计**：详细解释微带线的特性，如传播常数、衰减、带宽和阻抗匹配，以及如何根据设计需求选择合适的微带线参数。 3. **滤波器设计方法**：涵盖了设计滤波器的常用方法，如矩形谐振器、圆角谐振器、开槽线和耦合线结构，以及如何通过这些元素实现不同类型的滤波响应。 4. **电磁仿真工具**：介绍了使用电磁仿真软件，如JIA-SH、HFSS（High Frequency Structure Simulator），进行滤波器设计和性能预测的重要性。这些工具可以帮助设计师快速优化设计，减少实验次数。 5. **滤波器制造与测试**：讨论了制造工艺，包括印刷电路板（PCB）制作、组装和测试流程，以及如何确保滤波器的实际性能符合设计要求。 6. **实例分析**：书中包含多个实际滤波器设计案例，详细展示了从概念到实现的全过程，有助于读者理解和应用所学知识。 7. **版权与许可信息**：强调了对知识产权的尊重，指出对出版物的复制和使用需要遵循版权法相关规定，并提供了获取使用许可的途径。《Microstrip Filters for RF Microwave Applications 2nd》是一本宝贵的教育资源，对于想要深入了解微带滤波器设计的工程师或学生来说，它提供了丰富的理论知识和实践经验，有助于提升专业技能。

Preface to the First Edition

Filters play important roles in many RF/microwave applications. Emerging appli-

cations such as wireless communications continue to challenge RF/microwave ﬁl-

ters with ever more stringent requirements — higher performance, smaller size,

lighter weight, and lower cost. The recent advance of novel materials and fabrication

technologies, including high-temperature superconductors (HTS), low-temperature

coﬁred ceramics (LTCC), monolithic microwave-integrated circuit (MMIC), micro-

electromechanic system (MEMS), and micro-machining technology, have stimulated

the rapid development of new microstrip and other ﬁlters for RF/microwave ap-

plications. In the meantime, advances in computer-aided design (CAD) tools, such

as full-wave electromagnetic (EM) simulators, have revolutionized the ﬁlter de-

sign. Many novel microstrip ﬁlters with advanced ﬁltering characteristics have been

demonstrated. However, up until now there has not been a single book dedicated to

this subject.

Microstrip Filters for RF/Microwave Applications offers a unique and comprehen-

sive treatment of RF/microwave ﬁlters based on the microstrip structure, providing

a link to applications of computer-aided design tools and advanced materials and

technologies. Many novel and sophisticated ﬁlters using computer-aided design are

discussed, from basic concepts to practical realizations. The book is self-contained —

it is not only a valuable design resource, but also a handy reference for students, re-

searchers, and engineers in microwave engineering. It can also be used for RF/

microwave education.

The outstanding features of this book include discussion of many novel microstrip

ﬁlter conﬁgurations with advanced ﬁltering characteristics, new design techniques,

and methods for ﬁlter miniaturization. The book emphasizes computer analysis and

synthesis and full-wave electromagnetic (EM) simulation through a large number of

design examples. Applications of commercially available software are demonstrated.

Commercial applications are included as are design theories and methodologies,

which are not only for microstrip ﬁlters, but also directly applicable to other types of

ﬁlters, such as waveguide and other transmission-line ﬁlters. Therefore, this book is

more than just a text on microstrip ﬁlters.

CHAPTER ONE

Introduction

The term microwaves may be used to describe electromagnetic (EM) waves with

frequencies ranging from 300 MHz to 300 GHz, which correspond to wavelengths

(in free space) from 1 m to 1 mm. The EM waves with frequencies above 30 and up

to 300 GHz are also called millimeter waves, because their wavelengths are in the

millimeter range (1−10 mm). Above the millimeter wave spectrum is the infrared,

which comprises electromagnetic waves with wavelengths between 1 µm(10

−6

and 1 mm. Beyond the infrared spectrum is the visible optical spectrum, the ultraviolet

spectrum, and x rays. Below the microwave frequencyspectrum is the radio-frequency

(RF) spectrum. The frequency boundary between RF and microwaves is somewhat

arbitrary, depending on the particular technologies developed for the exploitation of

that speciﬁc frequency range. Therefore, by extension, the RF/microwave applications

can be referred to as communications, radar, navigation, radio astronomy, sensing,

medical instrumentation, and others that explore the usage of frequency spectrums

in the range, for example, 300 kHz up to 300 GHz (Fig. 1.1). For convenience,

some of these frequency spectrums are further divided into many frequency bands,

as indicated in Fig. 1.1.

Filters play important roles in many RF/microwave applications. They are used

to separate or combine different frequencies. The electromagnetic spectrum is lim-

ited and has to be shared; ﬁlters are used to select or conﬁne the RF/microwave

signals within assigned spectral limits. Emerging applications, such as wireless com-

munications, continue to challenge RF/microwave ﬁlters with ever more stringent

requirements — higher performance, more functionalities such as tunable or recon-

ﬁgurable, smaller size, lighter weight, and lower cost. Depending on the requirements

and speciﬁcations, RF/microwave ﬁlters may be designed as lumped element or dis-

tributed element circuits, they may be realized in various transmission-line structures,

such as waveguide, coaxial line, coplanar waveguide (CPW), slotline, and microstrip.

Microstrip Filters for RF/Microwave Applications by Jia-Sheng Hong



2011 John Wiley & Sons, Inc.

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