This book focuses on common microwave concepts and microwave circuit topics, introduces common microwave knowledge, focuses on engineering practice, and gives necessary theoretical derivations. The book has 13 chapters, covering microwave passive devices, active circuits, antennas, RF/microwave systems, common microwave units, etc. Each circuit has design examples and common structures, indicators, etc. Each part is relatively independent and the concepts are clear, so that readers can understand the basic content as soon as possible, understand the basic principles, master the design methods, and master the key indicators and debugging methods with experimental tests. Chapter 1 Introduction to RF/Microwave Engineering 1 1.1 Commonly used radio frequency bands 1 1.2 Important characteristics of RF/microwaves 4 1.2.1 Basic characteristics of RF/microwaves 4 1.2.2 Main advantages of RF/microwaves 5 1.2.3 Disadvantages of RF/microwaves 5 1.3 Core issues in RF/microwave engineering 5 1.3.1 RF iron triangle 5 1.3.2 Connotation of RF iron triangle 6 1.4 Application of RF/microwave circuits 7 1.5 Examples of RF/microwave systems 8 1.5.1 RF/microwave communication system 8 1.5.2 Radar system 9 1.6 Basic knowledge of RF/microwave engineering 12 1.6.1 Several concepts about decibel 12 1.6.2 Commonly used RF/microwave connectors 12 Chapter 2 Transmission Line Theory 13 2.1 RF characteristics of lumped parameter elements 13 2.1.1 Metal conductor 13 2.1.2 Resistance 15 2.1.3 Capacitance 16 2.1.4 Inductance 17 2.2 The concept of Q value in RF/microwave circuit design 18 2.3 Basic theory of transmission lines 19 2.4 Working state of lossless transmission line 20 2.4.1 Load end (z=0) situation 20 2.4.2 Input end (z=-L) situation 21 2.5 Working state of lossy transmission line 21 2.6 Smith chart 22 2.7 Theory and design of microstrip line 23 2.7.1 Introduction to various transmission lines 23 2.7.2 Microstrip line 23 2.8 Introduction to waveguide and coaxial transmission lines 30 2.8.1 Waveguide 30 2.8.2 Coaxial line 32 Chapter 3 Matching theory 33 3.1 Basic impedance matching theory 33 3.2 RF/microwave matching principle 34 3.3 Lumped parameter matching circuit 35 3.3.1 L-type matching circuit 35 3.3.2 3.3.3 Π-type matching circuit 40 3.4 Microstrip line matching circuit 42 3.4.1 Parallel microstrip matching circuit 42 3.4.2 Series microstrip matching circuit 45 3.5 Waveguide and coaxial line matching circuit 46 3.6 Microwave network parameters 47 3.6.1 Definition of four parameters 47 3.6.2 Conversion between four parameters 49 Chapter 4 Power attenuator 52 4.1 Principle of power attenuator 52 4.1.1 Technical indicators of attenuator 52 4.1.2 Basic structure of attenuator 53 4.1.3 Main uses of attenuator 53 4.2 Lumped parameter attenuator 53 4.2.1 Lumped parameter attenuator with same impedance 54 4.2.2 Lumped parameter attenuator with different impedance 56 4.2.3 Lumped parameter attenuator design example 58
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