MICROWAVE FILTERS FOR COMMUNICATION SYSTEMS: FUNDAMENTALS ...
Transcript of MICROWAVE FILTERS FOR COMMUNICATION SYSTEMS: FUNDAMENTALS ...
MICROWAVE FILTERS FOR COMMUNICATION SYSTEMS: FUNDAMENTALS, DESIGN, AND APPLICATIONS
RICHARD J. CAMERON CHANDRA M. KUDSIA RAAFAT R. MANSOUR
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WILEY-INTERSCIENCE A JOHN WILEY & SONS, INC., PUBLICATION
CONTENTS
FOREWORD xxi
PREFACE xxiii
ACKNOWLEDGMENTS xxxi
1 RADIO FREQUENCY (RF) FILTER NETWORKS FOR WIRELESS COMMUNICATIONS—THE SYSTEM PERSPECTIVE 1
Part I Introduction to a Communication System, Radio Spectrum, and Information / 2
1.1 Model of a Communication System / 2 1.1.1 Building Blocks of a Communication System / 3
1.2 Radio Spectrum and its Utilization / 7
1.2.1 Radio Propagation at Microwave Frequencies / 7 1.2.2 Radio Spectrum as a Natural Resource / 9
1.3 Concept of Information / 10 1.4 Communication Channel and Link Budgets / 12
1.4.1 Signal Power in a Communication Link / 12
1.4.2 Transmit and Receive Antennas / 13
Part II Noise in a Communication Channel / 18
1.5 Noise in Communication Systems / 18 1.5.1 Adjacent Copolarized Channel Interference / 18
vii
VIII CONTENTS
1.5.2 Adjacent Cross-Polarized Channel Interference / 19 1.5.3 Multipath Interference / 19 1.5.4 Thermal Noise / 20
1.5.5 Noise in Cascaded Networks / 26 1.5.6 Intermodulation (IM) Noise / 29 1.5.7 Distortion Due to Channel Imperfections / 31 1.5.8 RF Link Design / 34
1.6 Modulation-Demodulation Schemes in a Communication System / 37 1.6.1 Amplitude Modulation / 37 1.6.2 Formation of a Baseband Signal / 39
1.6.3 Angle-Modulated Signals / 40 1.6.4 Comparison of FM and AM Systems / 43
1.7 Digital Transmission / 46 1.7.1 Sampling / 46 1.7.2 Quantization / 47
1.7.3 PCM Systems / 47 1.7.4 Quantization Noise in PCM Systems / 48 1.7.5 Error Rates in Binary Transmission / 49
1.7.6 Digital Modulation and Demodulation Schemes / 50
1.7.7 Advanced Modulation Schemes / 53 1.7.8 Quality of Service and S/N Ratio / 58
Part III Impact of System Design on the Requirements of Filter Networks / 58
1.8 Communication Channels in a Satellite System / 58 1.8.1 Receive Section / 61
1.8.2 The Channelizer Section / 62 1.8.3 High-Power Amplifiers (HPAs) / 64
1.8.4 Transmitter Section Architecture / 67 1.9 RF Filters in Cellular Systems / 71
1.10 Impact of System Requirements on RF Filter Specifications / 74
1.11 Impact ofSatellite and Cellular Communications on Filter Technology / 77 Summary / 78 References / 78 Appendix 1A Intermodulation Distortion Summary / 80
2 FUNDAMENTALS OF CIRCUIT THEORY APPROXIMATION 83
2.1 Linear Systems / 83 2.1.1 Concept of Linearity / 84
2.2 Classification of Systems / 84
CONTENTS JX
2.2.1 Time-Invariant and Time-Variant Systems / 85
2.2.2 Lumped and Distributed Systems / 85 2.2.3 Instantaneous and Dynamic Systems / 85 2.2.4 Analog and Digital Systems / 85
2.3 Evolution of Electrical Circuits—A Historical Perspective / 86 2.3.1 Circuit Elements / 86
2.4 Network Equation of Linear Systems in the Time Domain / 87 2.5 Network Equation of Linear Systems in the Frequency-Domain
Exponential Driving Function / 89 2.5.1 Complex Frequency Variable / 90 2.5.2 Transfer Function / 91
2.5.3 Signal Representation by Continuous Exponentials / 92 2.5.4 Transfer Functions of Electrical Networks / 92
2.6 Steady-State Response of Linear Systems to Sinusoidal Excitations / 93
2.7 Circuit Theory Approximation / 94 Summary / 96
References / 96
3 CHARACTERIZATION OF LOSSLESS LOWPASS PROTOTYPE FILTER FUNCTIONS 97
3.1 The Ideal Filter / 97 3.1.1 Distortionless Transmission / 97 3.1.2 Maximum Power Transfer in Two-Port Networks / 98
3.2 Characterization of Polynomial Functions for Doubly Terminated Lossless Lowpass Prototype Filter Networks / 99 3.2.1 Reflection and Transmission Coefficients / 101 3.2.2 Normalization of the Characteristic Polynomials / 104
3.3 Characteristic Polynomials for Idealized Lowpass Prototype Networks / 105
3.4 Lowpass Prototype Characteristics / 107 3.4.1 Amplitude Response / 107
3.4.2 Phase Response / 107 3.4.3 Phase Linearity / 108
3.5 Characteristic Polynomials Versus Response Shapes / 109
3.5.1 All-Pole Prototype Filter Functions / 109 3.5.2 Prototype Filter Functions with Finite Transmission Zeros / 109
3.6 Classical Prototype Filters / 111 3.6.1 Maximally Fiat Filters / 111
3.6.2 Chebyshev Approximation / 112 3.6.3 Elliptic Function Filters / 115
CONTENTS
3.6.4 Odd-Order Elliptic Function Filters / 118 3.6.5 Even-Order Elliptic Function Filters / 119
3.6.6 Filters with Transmission Zeros and a Maximally Fiat Passband / 121
3.6.7 Linear Phase Filters / 121 3.6.8 Comparison of Maximally Fiat, Chebyshev, and
Elliptic Function Filters / 122
3.7 Uniried Design Chart (UDC) Relationships / 123 3.7.1 Ripple Factor / 124
3.8 Lowpass Prototype Circuit Configurations / 125
3.8.1 Scaling of Prototype Networks / 126 3.8.2 Frequency Response of Scaled Networks / 127
3.9 Effect of Dissipation / 130
3.9.1 Relationship of Dissipation Factor 8 and Quality Factor ß 0 / 132
3.9.2 Equivalent 8 for Lowpass and Highpass Filters / 134
3.9.3 Equivalent 8 for Bandpass and Bandstop Filters / 3.10 Asymmetrie Response Filters / 136
3.10.1 Positive Functions / 137 Summary / 140 References / 141 Appendix 3A Unified Design Charts / 143
COMPUTER-AIDED SYNTHESIS OF CHARACTERISTIC POLYNOMIALS
4.1 Objective Function and Constraints for Symmetrie Lowpass Prototype Filter Networks / 152
4.2 Analytic Gradients of the Objective Function / 154
4.2.1 Gradient of the Unconstrained Objective Function / 155
4.2.2 Gradient of the Inequality Constraint / 156
4.2.3 Gradient of the Equality Constraint / 157 4.3 Optimization Criteria for Classical Filters / 158
4.3.1 Chebyshev Function Filters / 158 4.3.2 Inverse Chebyshev Filters / 159 4.3.3 Elliptic Function Filters / 159
4.4 Generation of Novel Classes of Filter Functions / 161 4.4.1 Equiripple Passbands and Stopbands / 161
CONTENTS Xi
4.4.2 Nonequiripple Stopband with an Equiripple Passband / 163
4.5 Asymmetrie Class of Filters / 163 4.5.1 Asymmetrie Filters with Chebyshev
Passband / 164 4.5.2 Asymmetrical Filters with Arbitrary
Response / 166 4.6 Linear Phase Filters / 168 4.7 Critical Frequencies for Selected Filter Functions / 169 Summary / 169
References / 170 Appendix 4A Critical Frequencies for an Unconventional 8-Pole Filter / 171
5 ANALYSIS OF MULTIPORT MICROWAVE NETWORKS 173
5.1 Matrix Representation of Two-Port Networks / 174 5.1.1 Impedance [Z] and Admittance [T] Matrices / 174 5.1.2 The [ABCD] Matrix / 175
5.1.3 The Scattering [S] Matrix / 178 5.1.4 The Transmission Matrix [T] / 183
5.1.5 Analysis of Two-Port Networks / 185 5.2 Cascade of Two Networks / 189 5.3 Multiport Networks / 198
5.4 Analysis of Multiport Networks / 200 Summary / 205
References / 206
6 SYNTHESIS OF A GENERAL CLASS OF THE CHEBYSHEV FILTER FUNCTION 207
6.1 Polynomial forms of the Transfer and Reflection Parameters S2i(s) and Sj ,0) for a Two-Port Network / 207 6.1.1 Relationship Between e and eR / 215
6.2 Alternating Pole Method for Determination of the Denominator Polynomial E(s) / 216
6.3 General Polynomial Synthesis Methods for Chebyshev Filter Functions / 219 6.3.1 Polynomial Synthesis / 220 6.3.2 Recursive Technique / 225
6.3.3 Polynomial Forms for Symmetrie and Asymmetrie Filtering Functions / 229
XII CONTENTS
6.4 Predistorted Filter Characteristics / 230 6.4.1 Synthesis of the Predistorted Filter Network / 236
6.5 Transformation for Dual-Band Bandpass Filters / 238 Summary / 241
References / 242
7 SYNTHESIS OF NETWORK-CIRCUIT APPROACH 243
7.1 Circuit Synthesis Approach / 245
7.1.1 Buildup of [ABCD] Matrix for the Third-Degree Network / 246
7.1.2 Network Synthesis / 247 7.2 Lowpass Prototype Circuits for Coupled-Resonator
Microwave Bandpass Filters / 250 7.2.1 Synthesis of the [ABCD ] Polynomials for
Circuits with Inverters / 251 7.2.2 Synthesis of the [ABCD] Polynomials for the Singly
Terminated Filter Prototype / 258 7.3 Ladder Network Synthesis / 260 7.4 Synthesis Example of an Asymmetrie (4-2)
Filter Network / 269
Summary / 276 References / 277
8 COUPLING MATRIX SYNTHESIS OF FILTER NETWORKS 279
8.1 Coupling Matrix / 279
8.1.1 Bandpass and Lowpass Prototypes / 281 8.1.2 Formation of the General N x N Coupling Matrix and
its Analysis / 282 8.1.3 Formation of the Coupling Matrix from the Lowpass
Prototype Circuit Elements / 286
8.1.4 Analysis of the Network Represented by the Coupling Matrix / 288
8.1.5 Direct Analysis / 291 8.2 Direct Synthesis of the Coupling Matrix / 292
8.2.1 Direct Synthesis of the N x N Coupling Matrix / 293 8.3 Coupling Matrix Reduction / 295
8.3.1 Similarity Transformation and Annihilation of Matrix Elements / 296
8.4 Synthesis of the N + 2 Coupling Matrix / 303
CONTENTS XIII
8.4.1 Synthesis of the Transversal Coupling Matrix / 304 8.4.2 Reduction of the N + 2 Transversal Matrix to
the Folded Canonical Form / 311 8.4.3 Illustrative Example / 312
Summary / 315
References / 316
9 RECONFIGURATION OF THE FOLDED COUPLING MATRIX 319
9.1 Symmetrie Realizations for Dual-Mode Filters / 320 9.1.1 Sixth-Degree Filter / 322 9.1.2 Eighth-Degree Filter / 322
9.1.3 lOth-Degree Filter / 323
9.1.4 12th-Degree Filter / 323 9.2 Asymmetrie Realizations for Symmetrie Charaeteristies / 325 9.3 "Pfitzenmaier" Configurations / 326 9.4 Cascaded Quartets (CQs)—Two Quartets
in Cascade for Degrees 8 and Above / 328 9.5 Parallel-Connected Two-Port Networks / 331
9.5.1 Even-Mode and Odd-Mode Coupling Submatrices / 335 9.6 Cul-de-Sac Configuration / 337
9.6.1 Further Cul-de-Sac Forms / 340 9.6.2 Sensitivity Considerations / 345
Summary / 345 References / 347
10 SYNTHESIS AND APPLICATION OF EXTRACTED POLE AND TRISECTION ELEMENTS 349
10.1 Extracted Pole Filter Synthesis / 349
10.1.1 Synthesis of the Extracted Pole Element / 350 10.1.2 Example of Synthesis of Extracted
Pole Network / 354
10.1.3 Analysis of the Extracted Pole Filter Network / 357
10.1.4 Direct-Coupled Extracted Pole Filters / 360 10.2 Synthesis of Bandstop Filters Using
the Extracted Pole Technique / 364
10.2.1 Direct-Coupled Bandstop Filters / 366 10.3 Trisections / 371
10.3.1 Synthesis of the Trisection—Circuit Approach / 373
XIV CONTENTS
10.3.2 Cascade Trisections—Coupling Matrix Approach / 379
10.3.3 Techniques Based on the Trisection for Synthesis of Advanced Circuits / 387
10.4 Box Section and Extended Box Configurations / 392 10.4.1 Box Sections / 393 10.4.2 Extended Box Sections / 397
Summary / 401
References / 402
11 MICROWAVE RESONATORS 405
11.1 Microwave Resonator Configurations / 405 11.2 Calculation of Resonant Frequency / 409
11.2.1 Resonance Frequency of Conventional Transmission-Line Resonators / 409
11.2.2 Resonance Frequency Calculation Using the Transverse Resonance Technique / 412
11.2.3 Resonance Frequency of Arbitrarily Shaped Resonators / 413
11.3 Resonator Unloaded Q Factor / 416
11.3.1 Unloaded Q Factor of Conventional Resonators / 418 11.3.2 Unloaded Q of Arbitrarily Shaped Resonators / 421
11.4 Measurement of Loaded and Unloaded Q Factor / 421
Summary / 428
References / 429
12 WAVEGUIDE AND COAXIAL LOWPASS FILTERS 431
12.1 Commensurate-Line Building Elements / 432 12.2 Lowpass Prototype Transfer Polynomials / 433
12.2.1 Chebyshev Polynomials of the Second Kind / 433
12.2.2 Achieser-Zolotarev Functions / 436 12.3 Synthesis and Realization of the Distributed Stepped
Impedance Lowpass Filter / 438
12:3.1 Mapping the Transfer Function S2] from the w Plane to the 0 Plane / 439
12.3.2 Synthesis of the Stepped Impedance Lowpass Prototype Circuit / 441
12.3.3 Realization / 443
CONTENTS XV
12.4 Short-Step Transformers / 448 12.5 Synthesis and Realization of Mixed Lumped/Distributed
Lowpass Filter / 451 12.5.1 Formation of the Transfer and
Reflection Polynomials / 452
12.5.2 Synthesis of the Tapered-Corrugated Lowpass Prototype Circuit / 454
12.5.3 Realization / 458 Summary / 466
References / 466
13 WAVEGUIDE REALIZATION OF SINGLE- AND DUAL-MODE RESONATOR FILTERS 469
13.1 Synthesis Process / 470 13.2 Design of the Filter Function / 471
13.2.1 Amplitude Optimization / 471 13.2.2 Rejection Lobe Optimization / 472
13.2.3 Group Delay Optimization / 474 13.3 Realization and Analysis of the Microwave
Filter Network / 479
13.4 Dual-Mode Filters / 485 13.4.1 Virtual Negative Couplings / 486
13.5 Coupling Sign Correction / 488
13.6 Dual-Mode Realizations for Some Typical Coupling Matrix Configurations / 489 13.6.1 Folded Array / 490
13.6.2 Pfitzenmaier Configuration / 491 13.6.3 Propagating Forms / 492 13.6.4 Cascade Quartet / 492 13.6.5 Extended Box / 492
13.7 Phase- and Direct-Coupled Extracted Pole Filters / 494 13.8 The "Füll Inductive" Dual-Mode Filter / 496
13.8.1 Synthesis of the Equivalent Circuit / 498
Summary / 499 References / 500
14 DESIGN AND PHYSICAL REALIZATION OF COUPLED RESONATOR FILTERS 501
14.1 Circuit Models for Chebyshev Bandpass Filters / 502
XVI CONTENTS
14.2 Calculation of Interresonator Coupling / 507 14.2.1 The Use of Electric Wall and Magnetic
Wall Symmetry / 507
14.2.2 Interresonator Coupling Calculation Using S Parameters / 509
14.3 Calculation of Input/Output Coupling / 511 14.3.1 Frequency Domain Method / 511
14.3.2 Group Delay Method / 512 14.4 Design Example of Dielectric Resonator Filters Using the Coupling
Matrix Model / 513 14.4.1 Calculation of Dielectric Resonator Cavity
Configuration / 515 14.4.2 Calculation of Iris Dimensions for
Interresonator Coupling / 516 14.4.3 Calculation of Input/Output Coupling / 518
14.5 Design Example of a Waveguide Iris Filter Using the Impedance Inverter Model / 521
14.6 Design Example of a Microstrip Filter Using the /-Admittance Inverter Model / 524
Summary / 529 References / 530
15 ADVANCED EM-BASED DESIGN TECHNIQUES FOR MICROWAVE FILTERS 531
15.1 EM-Based Synthesis Techniques / 532 15.2 EM-Based Optimization Techniques / 532
15.2.1 Optimization Using an EM Simulator / 534 15.2.2 Optimization Using Semi-EM-Based Simulator / 535
15.2.3 Optimization Using an EM Simulator with Adaptive Frequency Sampling / 537
15.2.4 Optimization Using EM-Based Neural Network Models / 538
15.2.5 Optimization Using EM-Based Multidimensional Cauchy Technique / 543
15.2.6 Optimization Using EM-Based Fuzzy Logic / 544 15.3 EM-Based Advanced Design Techniques / 544
15.3.1 Space Mapping Techniques / 545
15.3.2 Calibrated Coarse Model (CCM) Techniques / 553 15.3.3 Generalized Calibrated Coarse Model Technique
for Filter Design / 559 Summary / 563
CONTENTS XVÜ
References / 564
DIELECTRIC RESONATOR FILTERS 567
16.1 Resonant Frequency Calculation in Dielectric Resonators / 568
16.2 Rigorous Analyses of Dielectric Resonators / 572
16.2.1 Mode Charts for Dielectric Resonators / 574
16.3 Dielectric Resonator Filter Configurations / 576 16.4 Design Considerations for Dielectric
Resonator Filters / 580 16.4.1 Achievable Filter Q Value / 580 16.4.2 Spurious Performance of Dielectric Resonator
Filters / 581
16.4.3 Temperature Drift / 582 16.4.4 Power Handling Capability / 583
16.5 Other Dielectric Resonator Configurations / 583 16.6 Cryogenic Dielectric Resonator Filters / 587 16.7 Hybrid Dielectric/Superconductor Filters / 589 Summary / 592
References / 593
ALLPASS PHASE AND GROUP DELAY EQUALIZER NETWORKS 595
17.1 Characteristics of Allpass Networks / 596
17.2 Lumped-Element Allpass Networks / 597
17.2.1 Resistively Terminated Symmetrie Lattice Networks / 599 17.2.2 Network Realizations / 601
17.3 Microwave Allpass Networks / 603
17.4 Physical Realization of Allpass Networks / 608 17.4.1 Transmission-Type Equalizers / 609 1 7.4.2 Reftection-Type Allpass Networks / 609
17.5 Synthesis of Reflection-Type Allpass Networks / 610
11.6 Practical Narrowband Reflection-Type Allpass Networks / 612
17.6.1 C-Section Allpass Equalizer in Waveguide Structure / 613 17.6.2 D-Section Allpass Equalizer in Waveguide Structure / 615
17.6.3 Narrowband TEM Reactance Networks / 615
17.7 Optimization Criteria for Allpass Networks / 616 17.8 Effect of Dissipation / 620
17.8.1 Dissipation Loss of a Lumped-Element First-Order Allpass Equalizer / 620
XVIII CONTENTS
17.8.2 Dissipation Loss of a Second-Order Lumped Equalizer / 621
17.8.3 Effect of Dissipation in Distributed Allpass Networks / 621
17.9 Equalization Tradeoffs / 622 Summary / 623 References / 623
18 MULTIPLEXER THEORY AND DESIGN 625
18.1 Background / 625 18.2 Multiplexer Configurations / 627
18.2.1 Hybrid Coupled Approach / 627 18.2.2 Circulator-Coupled Approach / 629 18.2.3 Directional Filter Approach / 630
18.2.4 Manifold-Coupled Approach / 630
18.3 RF Channelizers (Demultiplexers) / 632 18.3.1 Hybrid Branching Network / 633 18.3.2 Circulator-Coupled MUX / 634 18.3.3 En Passant Distortion / 636
18.4 RFCombiners / 638 18.4.1 Circulator-Coupled MUX / 640 18.4.2 Hybrid-Coupled Filter Combiner Module (HCFM)
Multiplexer / 640
18.4.3 Directional Filter Combiner / 643 18.4.4 Manifold Multiplexer / 645
18.5 Transmit-Receive Diplexers / 661
18.5.1 Internal Voltage Levels in Tx/Rx Diplexer Filters / 665
Summary / 668 References / 669
19 COMPUTER-AIDED DIAGNOSIS AND TUNING OF MICROWAVE FILTERS 671
19.1 Sequential Tuning of Coupled Resonator Filters / 672 19.2 Computer-Aided Tuning Based on Circuit Model Parameter
Extraction / 678 19.3 Computer-Aided Tuning Based on Poles and Zeros of the
Input Reflection Coefficient / 683
19.4 Time-Domain Tuning / 687
CONTENTS XIX
19.4.1 Time-Domain Tuning of Resonator Frequencies / 688
19.4.2 Time-Domain Tuning of Interresonator Coupling / 689
19.4.3 Time-Domain Response of a Golden Filter / 691
19.5 Filter Tuning Based on Fuzzy Logic Techniques / 692 19.5.1 Description of Fuzzy Logic Systems / 693
19.5.2 Steps in Building the FL System / 694 19.5.3 Comparison Between Boolean Logic and
Fuzzy Logic / 697 19.5.4 Applying Fuzzy Logic to Filter
Tuning / 700 19.6 Automated Setups for Filter Tuning / 703 Summary / 706
References / 707
20 HIGH-POWER CONSIDERATIONS IN MICROWAVE FILTER NETWORKS 711
20.1 Background / 711 20.2 High-Power Requirements in Wireless Systems / 712
20.3 High-Power Amplifiers (HPAs) / 713 20.4 High-Power Breakdown Phenomena / 714
20.4.1 Gaseous Breakdown / 715
20.4.2 Mean Free Path / 715 20.4.3 Diffusion / 716
20.4.4 Attachment / 716 20.4.5 Breakdown in Air / 716 20.4.6 Critical Pressure / 717 20.4.7 Power Rating of Waveguides and Coaxial
Transmission Lines / 719
20.4.8 Derating Factors / 720 20.4.9 Impact of Thermal Dissipation on
Power Rating / 721
20.5 High-Power Bandpass Filters / 722 20.5.1 Bandpass Filters Limited by Thermal
Dissipation / 723
20.5.2 Bandpass Filters Limited by Voltage Breakdown / 724
20.5.3 Filter Prototype Network / 724
XX CONTENTS
20.5.4 Lumped To Distributed Scaling / 725 20.5.5 Resonator Voltages from Prototype
Network / 726
20.5.6 Example and Verification Via FEM Simulation / 727
20.5.7 Example of High Voltages in a Multiplexer / 729
20.6 Multipaction Breakdown / 730 20.6.1 Dependence on Vacuum Environment / 730
20.6.2 Dependence on Applied RF Voltage / 730 20.6.3 Dependence on / x d Product / 731 20.6.4 Dependence on Surface Conditions
of Materials / 732 20.6.5 Detection and Prevention of Multipaction / 732
20.6.6 Design Margins in Multipaction / 733 20.6.7 Multipactor Breakdown Levels / 737
20.7 Passive Intermodulation (PIM) Consideration for High-Power Equipment / 739 20.7.1 PIM Measurement / 740 20.7.2 PIM Control Guidelines / 741
Summary / 742
References / 743
APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
INDEX
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