Timed arrays : wideband and time varying antenna arrays /

Timed arrays : wideband and time varying antenna arrays /

Introduces timed arrays and design approaches to meet the new high performance standards The author concentrates on any aspect of an antenna array that must be viewed from a time perspective. The first chapters briefly introduce antenna arrays and explain the difference between phased and timed arra...

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Bibliographic Details
Main Author: Haupt, Randy L.
Format: Electronic eBook
Language:English
Published: Hoboken, New Jersey : John Wiley & Sons Inc., [2015]
Subjects:
Antenna arrays.
Adaptive antennas.
Time-domain analysis.
Online Access:CONNECT
Table of Contents:
  • List of Figures x
  • Preface xix
  • 1 Timed and Phased Array Antennas 1
  • 1.1 Large Antennas 1
  • 1.2 Collection of Elements 3
  • 1.3 Overview of an Array Architecture 6
  • 1.4 Transient Versus Steady State 7
  • 1.5 Time Versus Phase 7
  • 1.6 Book Overview 8
  • References 9
  • 2 RF Signals 10
  • 2.1 The Carrier and Modulation 10
  • 2.2 Noise and Interference 12
  • 2.3 Polarization 15
  • 2.4 Signal Bandwidth 17
  • Reference 18
  • 3 Arrays of Point Sources 19
  • 3.1 Point Sources 19
  • 3.2 Far Field 20
  • 3.3 Array Sampling in the Time Domain 21
  • 3.4 Array Sampling in the Frequency Domain 22
  • 3.5 Grating Lobes: Spatial Aliasing 23
  • 3.6 Subarrays and Panels 26
  • 3.7 Electronic Beam Steering 29
  • 3.8 Amplitude Weighting 31
  • 3.8.1 Dolph-Chebyshev Taper 32
  • 3.8.2 Taylor Tapers 33
  • 3.8.3 Bayliss 34
  • 3.9 Thinned Arrays 36
  • References 39
  • 4 Elements in Timed Arrays 41
  • 4.1 Element Characteristics 41
  • 4.1.1 Polarization 42
  • 4.1.2 Impedance 43
  • 4.1.3 Phase center 44
  • 4.1.4 Conformal 44
  • 4.1.5 Size 44
  • 4.1.6 Directivity 45
  • 4.1.7 Bandwidth 45
  • 4.1.8 Balun 45
  • 4.2 Elements 46
  • 4.2.1 Dipole Array 46
  • 4.2.2 Patch Array 47
  • 4.2.3 Spiral Array 50
  • 4.2.4 Helical Array 52
  • 4.2.5 Tapered Slot Antenna (TSA) Array 53
  • 4.2.6 Tightly Coupled Arrays 55
  • 4.2.7 Fragmented Arrays 62
  • 4.3 Mutual Coupling 63
  • 4.4 Element Dispersion 66
  • 4.5 Scaled Arrays 68
  • 4.6 Interleaved Arrays 70
  • References 75
  • 5 Array Beamforming 78
  • 5.1 PCB Transmission Lines 78
  • 5.2 S-parameters 81
  • 5.3 Matching Circuits 82
  • 5.4 Corporate Feeds 82
  • 5.5 Distributed Versus Centralized Amplification 83
  • 5.6 Blass Matrix 84
  • 5.7 Butler Matrix 85
  • 5.8 Lenses 86
  • 5.9 Reflectarrays 89
  • 5.10 Digital Beamforming 91
  • References 93
  • 6 Active Electronically Scanned Array Technology 95
  • 6.1 Semiconductor Technology for T/R Modules 96
  • 6.2 T/R Module Layout 98
  • 6.3 Amplifiers 100
  • 6.4 Switches 109
  • 6.5 Phase Shifter 114
  • 6.6 Attenuators 120.
  • 6.7 Limiter 121
  • 6.8 Circulator 121
  • 6.9 Correcting Errors through Calibration and Compensation 121
  • References 123
  • 7 Time Delay in a Corporate-Fed Array 126
  • 7.1 Pulse Dispersion 128
  • 7.2 Phased Array Bandwidth 130
  • 7.3 Time Delay Steering Calculations 133
  • 7.4 Time Delay Units 135
  • 7.5 Unit Cell Constraints 138
  • 7.6 Time Delay Bit Distribution at the Subarray Level 141
  • References 147
  • 8 Adaptive Arrays 149
  • 8.1 Signal Correlation Matrix 150
  • 8.2 Optimum Array Weights 152
  • 8.3 Adaptive Weights Without Inverting the Correlation Matrix 154
  • 8.4 Algorithms for Nondigital Beamformers 155
  • 8.4.1 Partial Adaptive Nulling 156
  • 8.4.2 Adaptive Nulling with Weight Constraints 158
  • 8.4.3 Adaptive Nulling with Cancellation Beams 159
  • 8.5 Reconfigurable Arrays 160
  • 8.6 Reconfigurable Elements 165
  • 8.7 Time-Modulated Arrays 167
  • 8.8 Adaptive Thinning 172
  • 8.9 Other Adaptive Array Alternatives 177
  • 8.9.1 Beam Switching 178
  • 8.9.2 Direction Finding 178
  • 8.9.3 Retrodirective Array 181
  • 8.9.4 MIMO 181
  • References 184
  • List of Symbols and Abbreviations 188
  • Index 194.

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