微带滤波器在射频微波应用中的设计

5星 · 超过95%的资源需积分: 9 190 浏览量更新于2024-07-23 收藏 5.51MB PDF 举报

"Microstrip Filters for RF and Microwave Applications"是一本由Jia-Sheng Hong和M.J. Lancaster合著的专业书籍，专注于微带滤波器在射频和微波应用中的设计与实现。这本书通过计算机辅助设计工具，详细介绍了一系列新颖且复杂的微带滤波器，从基础概念到实际应用，为学生、研究人员和微波工程领域的工程师提供了全面的指导和参考。此外，该书也适合用于射频/微波教育。微带滤波器是射频和微波通信系统中至关重要的组件，它们主要用于信号的选择和净化，去除不必要的频率成分，确保信号传输的质量和效率。本书深入探讨了微带滤波器的设计原理，包括滤波器的基本结构、特性、理论分析以及如何利用计算机辅助设计（CAD）工具进行优化。微带结构因其尺寸小、重量轻、制造成本低等优点，在射频和微波领域得到了广泛应用。书中涵盖了各种类型的微带滤波器，如低通、高通、带通和带阻滤波器，以及更复杂的设计如多模滤波器和慢波滤波器。作者详细阐述了滤波器的频率响应、通带选择性、阻带抑制等关键性能指标的计算方法，并讨论了如何通过改变滤波器的物理参数（如长度、宽度、介电常数等）来调整这些性能。此外，还提到了使用先进材料和技术对滤波器性能的影响，如高频和低损耗的介质材料、微带线与同轴线的转换结构等。为了帮助读者更好地理解和应用这些理论，书中包含了许多实例分析和设计案例，展示从理论设计到实物制作的全过程。这些实践性的内容有助于工程师在实际项目中快速找到解决问题的方法。同时，书中也提到了知识产权的问题，强调了尊重和了解公司商标的重要性。《Microstrip Filters for RF and Microwave Applications》是微波工程领域的一本重要参考资料，它不仅提供了丰富的理论知识，还结合了现代设计工具和最新技术，对于从事射频和微波滤波器设计的人员来说，是一本不可或缺的书籍。

CHAPTER 1

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 GHz

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 in-

frared, which comprises electromagnetic waves with wavelengths between 1 ␮m

(10

–6

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

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

the radio frequency (RF) spectrum. The frequency boundary between RF and mi-

crowaves 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 us-

age of frequency spectrums in the range of, say, 300 kHz up to 300 GHz (Figure

1.1). For convenience, some of these frequency spectrums are further divided into

many frequency bands as indicated in Figure 1.1.

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

separate or combine different frequencies. The electromagnetic spectrum is limited

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 communica-

tions continue to challenge RF/microwave filters with ever more stringent require-

ments—higher performance, smaller size, lighter weight, and lower cost. Depending

on the requirements and specifications, RF/microwave filters may be designed as

lumped element or distributed element circuits; they may be realized in various trans-

mission line structures, such as waveguide, coaxial line, and microstrip.

The recent advance of novel materials and fabrication technologies, including

monolithic microwave integrated circuit (MMIC), microelectromechanic system

(MEMS), micromachining, high-temperature superconductor (HTS), and low-tem-

perature cofired ceramics (LTCC), has stimulated the rapid development of new mi-

Chapter 8 presents a comprehensive treatment of subjects regarding coupled res-

onator circuits. These are of importance for design of RF/microwave filters, in par-

ticular the narrow-band bandpass filters, which play a significant role in many ap-

plications. There is a general technique for designing coupled resonator filters,

which can be applied to any type of resonator despite its physical structure. For ex-

ample, it can be applied to the design of waveguide filters, dielectric resonator fil-

ters, ceramic combline filters, microstrip filters, superconducting filters, and micro-

machined filters. This design method is based on coupling coefficients of

intercoupled resonators and the external quality factors of the input and output res-

onators. Since this design technique is so useful and flexible, it would be desirable

to have a deep understanding not only of its approach, but also its theory. For this

purpose, the subjects cover the formulation of the general coupling matrix, which is

of importance for representing a wide range of coupled-resonator filter topologies,

the general theory of couplings for establishing the relationship between the cou-

pling coefficient and the physical structure of coupled resonators. This leads to a

very useful formulation for extracting coupling coefficients from EM simulations

or measurements. Formulations for extracting the external quality factors from fre-

quency responses of the externally loaded input/output resonators are derived next.

Numerical examples are followed to demonstrate how to use these formulations to

extract coupling coefficients and external quality factors of microwave coupling

structures for filter designs.

Chapter 9 is concerned with computer-aided design (CAD). Generally speaking,

any design that involves using computers may be called CAD. There have been ex-

traordinary recent advances in CAD of RF/microwave circuits, particularly in full-

wave electromagnetic (EM) simulations. They have been implemented both in com-

mercial and specific in-house software and are being applied to microwave filter

simulation, modeling, design, and validation. The developments in this area are cer-

tainly being stimulated by increasing computer power. Another driving force for the

developments is the requirement of CAD for low-cost and high-volume production.

In general, besides the investment for tooling, materials and labor mainly affect the

cost of filter production. Labor costs include those for design, fabrication, testing,

and tuning. Here the costs for the design and tuning can be reduced greatly by using

CAD, which can provide more accurate design with less design iterations, leading to

first-pass or tuneless filters. This chapter discusses computer simulation and/or

computer optimization. It summarizes some basic concepts and methods regarding

filter design by CAD. Typical examples of the applications, including filter synthe-

sis by optimization, are described. Many more CAD examples, particularly those

based on full-wave EM simulation, can be found through this book.

In Chapter 10, we discuss the designs of some advanced filters, including selec-

tive filters with a single pair of transmission zeros, cascaded quadruplet (CQ) fil-

ters, trisection and cascaded trisection (CT) filters, cross-coupled filters using

transmission line inserted inverters, linear phase filters for group delay equaliza-

tion, and extracted-pole filters. These types of filters, which are different from con-

ventional Chebyshev filters, must meet the stringent requirements of RF/microwave

systems, particularly wireless communications systems.

INTRODUCTION

剩余485页未读，继续阅读

dengkundk

粉丝: 0
资源: 6

微带滤波器在射频微波应用中的设计

微带滤波器在RF/微波应用中的关键技术

微带滤波器在射频微波应用中的设计原理

印刷电路板与EMC设计技术：Microstrip与Stripline

Microstrip Filters for RF/Microwave Applications

microstrip filters for rf / microwave applications 2nd

Microstrip Filters for RF Microwave Applications

Microstrip Filters for RF Microwave Applications 2nd

Microstrip Filters for RF Microwave Applications 2001

Microstrip Filters for RF Microwave Applications second edition

Microstrip Filters for RF Microwave Applications .pdf

最新资源