Microwave Engineering Third Edition
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1 Microwave Engineering Third Edition David M. Pozar University of Massachusetts at Amherst WILEY John Wiley & Sons, Inc.
2 ELECTROMAGNETIC THEORY Introduction to Microwave Engineering 1 Applications of Microwave Engineering 2 A Short History of Microwave Engineering Maxwell's Equations Fields in Media and Boundary Conditions 9 Fields at a General Material Interface 11 Fields at a Dielectric Interface Fields at the Interface with a Perfect Conductor (Electric Wall) 13 The Magnetic Wall Boundary Condition 14 The Radiation Condition 1.4 The Wave Equation and Basic Plane Wave Solutions 14 The Helmholtz Equation 14 Plane Waves in a Lossless Medium 15 Plane Waves in a General Lossy Medium 16 Plane Waves in a Good Conductor General Plane Wave Solutions 19 Circularly Polarized Plane Waves Energy and Power 24 Power Absorbed by a Good Conductor Plane Wave Reflection from a Media Interface 27 General Medium 28 Lossless Medium 29 Good Conductor 30 Perfect Conductor 32 The Surface Impedance Concept Oblique Incidence at a Dielectric Interface 34 Parallel Polarization 35 Perpendicular Polarization 36 Total Reflection and Surface Waves Some Useful Theorems 40 The Reciprocity Theorem 40 Image Theory 42
3 x 2 Т. TRANSMISSION LINE THEORY The Lumped-Element Circuit Model for a Transmission Line 49 Wave Propagation on a Transmission Line 51 The Lossless Line Field Analysis of Transmission Lines 52 Transmission Line Parameters 52 The Telegrapher Equations Derived from Field Analysis of a Coaxial Line 55 Propagation Constant, Impedance, and Power Flow for the Lossless Coaxial Line The Terminated Lossless Transmission Line 57 Special Cases of Lossless Terminated Lines The Smith Chart 64 The Combined Impedance-Admittance Smith Chart 68 The Slotted Line The Quarter-Wave Transformer 73 The Impedance Viewpoint 73 The Multiple Reflection Viewpoint Generator and Load Mismatches 77 Load Matched to Line 78 Generator Matched to Loaded Line 78 Conjugate Matching Lossy Transmission Lines 79 The Low-Loss Line 79 The Distortionless Line 81 The Terminated Lossy Line 82 The Perturbation Method for Calculating Attenuation 83 The Wheeler Incremental Inductance Rule 84 3 TRANSMISSION LINES AND WAVEGUIDES General Solutions for ТЕМ, ТЕ, and TM Waves 92 ТЕМ Waves 94 ТЕ Waves 96 TM Waves 96 Attenuation Due to Dielectric Loss Parallel Plate Waveguide 98 ТЕМ Modes 99 TM Modes 100 ТЕ Modes Rectangular Waveguide 106 ТЕ Modes 106 TM Modes 111 TE m0 Modes of a Partially Loaded Waveguide Circular Waveguide 117 ТЕ Modes 118 TM Modes Coaxial Line 126 ТЕМ Modes 126 Higher Order Modes Surface Waves on a Grounded Dielectric Slab 131 TM Modes 131 ТЕ Modes 134
4 xi 3.7 Stripline 137 Formulas for Propagation Constant, Characteristic Impedance, and Attenuation 138 An Approximate Electrostatic Solution Microstrip 143 Formulas for Effective Dielectric Constant, Characteristic Impedance, and Attenuation 144 An Approximate Electrostatic Solution The Transverse Resonance Technique 149 TEo Modes of a Partially Loaded Rectangular Waveguide Wave Velocities and Dispersion 151, Group Velocity Summary of Transmission Lines and Waveguides 154 Other Types of Lines and Guides 154 MICROWAVE NETWORK ANALYSIS Impedance and Equivalent Voltages and Currents 162 Equivalent Voltages and Currents 162 The Concept of Impedance 166 Even and Odd Properties of Z(co) and Г (со) Impedance and Admittance Matrices 170 Reciprocal Networks 171 Lossless Networks The Scattering Matrix 174 Reciprocal Networks and Lossless Networks 177 A Shift in Reference Planes 180 Generalized Scattering Parameters The Transmission (ABCD) Matrix 183 Relation to Impedance Matrix 185 Equivalent Circuits for Two-Port Networks Signal Flow Graphs 189 Decomposition of Signal Flow Graphs 190 Application to TRL Network Analyzer Calibration Discontinuities and Modal Analysis 197 Modal Analysis of an Я-Plane Step in Rectangular Waveguide Excitation of Waveguides Electric and Magnetic Currents 204 Current Sheets That Excite Only One Waveguide Mode 204 Mode Excitation from an Arbitrary Electric or Magnetic Current Source Excitation of Waveguides Aperture Coupling 209 Coupling Through an Aperture in a Transverse Waveguide Wall 212 Coupling Through an Aperture in the Broad Wall of a Waveguide 214
5 xii 5 Z. IMPEDANCE MATCHING AND TUNING Matching with Lumped Elements (L Networks) 223 Analytic Solutions 224 Smith Chart Solutions Single-Stub Tuning 228 Shunt Stubs 228 Series Stubs Double-Stub Tuning 235 Smith Chart Solution 235 Analytic Solution The Quarter-Wave Transformer The Theory of Small Reflections 244 Single-Section Transformer 244 Multisection Transformer Binomial Multisection Matching Transformers Chebyshev Multisection Matching Transformers 250 Chebyshev Polynomials 251 Design of Chebyshev Transformers Tapered Lines 255 Exponential Taper 257 Triangular Taper 258 Klopfenstein Taper The Bode-Fano Criterion 261 MICROWAVE RESONATORS Series and Parallel Resonant Circuits 266 Series Resonant Circuit 266 Parallel Resonant Circuit 269 Loaded and Unloaded Q Transmission Line Resonators 272 Short-Circuited A/2 Line 272 Short-Circuited A./4 Line 275 Open-Circuited Л/2 Line Rectangular Waveguide Cavities 278 Resonant Frequencies 278 ßof the ТЕ юг Mode Circular Waveguide Cavities 282 Resonant Frequencies 282 Q of the TE mf Mode Dielectric Resonators 287 Resonant Frequencies of TEois Mode Excitation of Resonators 291 Critical Coupling 291 A Gap-Coupled Microstrip Resonator 292 An Aperture-Coupled Cavity Cavity Perturbations 298 Material Perturbations 298 Shape Perturbations 300
6 POWER DIVIDERS AND DIRECTIONAL COUPLERS Basic Properties of Dividers and Couplers 308 Three-Port Networks (T-Junctions) 309 Four-Port Networks (Directional Couplers) The T-Junction Power Divider 315 Lossless Divider 316 Resistive Divider The Wilkinson Power Divider 318 Even-Odd Mode Analysis 319 Unequal Power Division and N-Way Wilkinson Dividers Waveguide Directional Couplers 323 Bethe Hole Coupler 324 Design of Multihole Couplers The Quadrature (90 ) Hybrid 333 Even-Odd Mode Analysis Coupled Line Directional Couplers 337 Coupled Line Theory 337 Design of Coupled Line Couplers 341 Design of Multisection Coupled Line Couplers The Lange Coupler The 180 Hybrid 352 Even-Odd Mode Analysis of the Ring Hybrid 354 Even-Odd Mode Analysis of the Tapered Coupled Line Hybrid 357 Waveguide Magic-T Other Couplers 361 MICROWAVE FILTERS Periodic Structures 371 Analysis of Infinite Periodic Structures 372 Terminated Periodic Structures 374 k-ß Diagrams and Wave Velocities Filter Design by the Image Parameter Method 378 Image Impedances and Transfer Functions for Two-Port Networks 378 Constant-^ Filter Sections 380 m-derived Filter Sections 383 Composite Filters Filter Design by the Insertion Loss Method 389 Characterization by Power Loss Ratio 389 Maximally Flat Low-Pass Filter Prototype 392 Equal-Ripple Low-Pass Filter Prototype 394 Linear Phase Low-Pass Filter Prototypes Filter Transformations 398 Impedance and Frequency Scaling 398 Bandpass and Bandstop Transformations 401
7 xiv 8.5 Filter Implementation 405 Richard's Transformation 406 Kuroda's Identities 406 Impedance and Admittance Inverters Stepped-Impedance Low-Pass Filters 412 Approximate Equivalent Circuits for Short Transmission Line Sections Coupled Line Filters 416 Filter Properties of a Coupled Line Section 416 Design of Coupled Line Bandpass Filters Filters Using Coupled Resonators 427 Bandstop and Bandpass Filters Using Quarter-Wave Resonators 427 Bandpass Filters Using Capacitively Coupled Series Resonators 431 Bandpass Filters Using Capacitively Coupled Shunt Resonators THEORY AND DESIGN OF FERRIMAGNETIC COMPONENTS Basic Properties of Ferrimagnetic Materials 442 The Permeability Tensor 442 Circularly Polarized Fields 447 Effect of Loss 449 Demagnetization Factors Plane Wave Propagation in a Ferrite Medium 454 Propagation in Direction of Bias (Faraday Rotation) 455 Propagation Transverse to Bias (Birefringence) Propagation in a Ferrite-Loaded Rectangular Waveguide 460 TE m0 Modes of Waveguide with a Single Ferrite Slab 460 TE m o Modes of Waveguide with Two Symmetrical Ferrite Slabs Ferrite Isolators 465 Resonance Isolators 465 The Field Displacement Isolator Ferrite Phase Shifters 471 Nonreciprocal Latching Phase Shifter 471 Other Types of Ferrite Phase Shifters 474 TheGyrator Ferrite Circulators 476 Properties of a Mismatched Circulator 476 Junction Circulator NOISE AND ACTIVE RF COMPONENTS Noise in Microwave Circuits 487 Dynamic Range and Sources of Noise 487 Noise Power and Equivalent Noise Temperature 489 Measurement of Noise Temperature 492 Noise Figure 493 Noise Figure of a Cascaded System 495 Noise Figure of a Passive Two-Port Network 497 Noise Figure of a Mismatched Lossy Line 498
8 xv 10.2 Dynamic Range and Intermodulation Distortion 500 Gain Compression 501 Intermodulation Distortion 502 Third-Order Intercept Point 504 Dynamic Range 505 Intercept Point of a Cascaded System 507 Passive Intermodulation RF Diode Characteristics 509 Schottky Diodes and Detectors 509 PIN Diodes and Control Circuits 514 Varactor Diodes 520 Other Diodes RF Transistor Characteristics 522 Field Effect Transistors (FETs) 523 Bipolar Junction Transistors (BJTs) Microwave Integrated Circuits 526 Hybrid Microwave Integrated Circuits 527 Monolithic Microwave Integrated Circuits 528 MICROWAVE AMPLIFIER DESIGN Two-Port Power Gains 536 Definitions of Two-Port Power Gains 537 Further Discussion of Two-Port Power Gains Stability 542 Stability Circles 543 Tests for Unconditional Stability Single-Stage Transistor Amplifier Design 548 Design for Maximum Gain (Conjugate Matching) 548 Constant Gain Circles and Design for Specified Gain 553 Low-Noise Amplifier Design Broadband Transistor Amplifier Design 561 Balanced Amplifiers 562 Distributed Amplifiers Power Amplifiers 570 Characteristics of Power Amplifiers and Amplifier Classes 570 Large-Signal Characterization of Transistors 571 Design of Class A Power Amplifiers 572 OSCILLATORS AND MIXERS RF Oscillators 578 General Analysis 578 Oscillators Using a Common Emitter BJT 579 Oscillators Using a Common Gate FET 581 Practical Considerations 582 Crystal Oscillators Microwave Oscillators 585 Transistor Oscillators 587 Dielectric Resonator Oscillators Oscillator Phase Noise 594 Representation of Phase Noise 594 Leeson's Model for Oscillator Phase Noise 595
9 xvi 12.4 Frequency Multipliers 599 Reactive Diode Multipliers (Manley-Rowe Relations) 600 Resistive Diode Multipliers 602 Transistor Multipliers Overview of Microwave Sources 608 Solid-State Sources 609 Microwave Tubes Mixers 615 Mixer Characteristics 616 Single-Ended Diode Mixer 620 Single-Ended FET Mixer 622 Balanced Mixer 625 Image Reject Mixer 627 Other Mixers INTRODUCTION TO MICROWAVE SYSTEMS System Aspects of Antennas 633 Fields and Power Radiated by an Antenna 635 Antenna Pattern Characteristics 637 Antenna Gain and Efficiency 639 Aperture Efficiency and Effective Area 640 Background and Brightness Temperature 641 Antenna Noise Temperature and GIT Wireless Communication Systems 646 The Friis Formula 647 Radio Receiver Architectures 650 Noise Characterization of a Microwave Receiver 652 Wireless Systems Radar Systems 659 The Radar Equation 660 Pulse Radar 662 Doppler Radar 663 Radar Cross Section Radiometer Systems 665 Theory and Applications of Radiometry 665 Total Power Radiometer 667 The Dicke Radiometer Microwave Propagation 670 Atmospheric Effects 670 Ground Effects 672 Plasma Effects Other Applications and Topics 674 Microwave Heating 674 Power Transfer 675 Biological Effects and Safety 675 APPENDICES 680 A Prefixes 681 В Vector Analysis 681 С Bessel Functions 683 D Other Mathematical Results 686 E Physical Constants 686 F Conductivities for Some Materials 687 G Dielectric Constants and Loss Tangents for Some Materials 687
10 xvii H Properties of Some Microwave Ferrite Materials 688 I Standard Rectangular Waveguide Data 688 J Standard Coaxial Cable Data 689 ANSWERS TO SELECTED PROBLEMS 690 INDEX 693
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