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 arrays. Since timed arrays are designed for realistic time–varying signals and scenarios, the book also reviews wideband signals, baseband and passband RF signals, polarization and signal bandwidth. Other topics covered include time domain, mutual coupling, wideband elements, and dispersion. The author also presents a number of analog and digital beamforming networks for creating and manipulating beams. The book concludes with an overview of the methods to integrate time delay into the array design and of several other adaptive arrays that prove useful in many different systems.  

Examines RF signal concepts such as polarization and signal bandwidth and their applications to timed antenna arrays Covers arrays of point source, elements in timed antenna arrays, active electronically scanned array technology, and time delay in corporate fed arrays Includes complete design examples for placing time delay in arrays

Timed Arrays: Wideband and Time Varying Antenna Arrays is written for practicing engineers and scientists in wireless communication, radar, and remote sensing as well as graduate students and professors interested in advanced antenna topics.

Randy Haupt, PhD., is Professor and Department Head of EECS at the Colorado School of Mines. He received his PhD from the University of Michigan and retired from the USAF as a LtCol. Dr. Haupt was an RF staff consultant at Ball Aerospace & Technologies, Corp., senior scientist and department head at the Applied Research Laboratory of Penn State, professor and department head of ECE at Utah State, professor and chair of EE at the University of Nevada Reno, and professor of EE at the USAF Academy. Dr. Haupt is a Fellow of the IEEE and Applied Computational Electromagnetics Society (ACES).

LIST OF FIGURES PREFACE 1 Timed and Phased Array Antennas 1.1 Large Antennas 1.2 Collection of Elements 1.3 Overview of an Array Architecture 1.4 Transient Vs. Steady State 1.5 Time Vs. Phase 1.6 Book Overview 2 RF Signals 2.1 The Carrier and Modulation 2.2 Noise and Interference 2.3 Polarization 2.4 Signal Bandwidth 3 Arrays of Point Sources 3.1 Point Sources 3.2 Far Field 3.3 Array Sampling in the Time Domain 3.4 Array Sampling in the Frequency Domain 3.5 Grating Lobes: Spatial Aliasing 3.6 Subarrays and Panels 3.7 Electronic Beam Steering 3.8 Amplitude Weighting 3.8.1 Dolph–Chebyshev Taper 3.8.2 Taylor Tapers 3.8.3 Bayliss 3.9 Thinned Arrays 4 Elements in Timed Arrays 4.1 Element Characteristics 4.1.1 Polarization. 4.1.2 Impedance. 4.1.3 Phase center. 4.1.4 Conformal. 4.1.5 Size. 4.1.6 Directivity 4.1.7 Bandwidth. 4.1.8 Balun. 4.2 Elements 4.2.1 Dipole Array 4.2.2 Patch Array 4.2.3 Spiral Array 4.2.4 Helical Array 4.2.5 Tapered Slot Antenna (TSA) Array 4.2.6 Tightly Coupled Arrays 4.2.7 Fragmented Arrays 4.3 Mutual Coupling 4.4 Element Dispersion 4.5 Scaled Arrays 4.6 Interleaved Arrays 5 Array Beamforming 5.1. PCB Transmission Lines 5.2. S–parameters 5.3. Matching Circuits 5.4. Corporate Feeds 5.5. Distributed Vs. Centralized Amplification 5.6. Blass Matrix 5.7. Butler Matrix 5.8. Lenses 5.9. Reflectarrays 5.10. Digital Beamforming 6 ActiveElectronically Scanned Array Technology 6.1 Semiconductor Technology for T/R Modules 6.2 T/R Module Layout 6.3 Amplifiers 6.4 Switches 6.5 Phase Shifter 6.6 Attenuators 6.7 Limiter 6.8 Circulator 6.9 Correcting Errors Through Calibration and Compensation 7 Time Delay in a Corporate Fed Array 7.1 Pulse Dispersion 7.2 Phased Array Bandwidth 7.3 Time Delay Steering Calculations 7.4 Time Delay Units 7.5 Unit Cell Constraints 7.6 Time Delay Bit Distribution at the Subarray Level 8 Equation Chapter 1 Section 1Adaptive Arrays 8.1 Signal Correlation Matrix 8.2 Optimum Array Weights 8.3 Adaptive Weighs without Inverting the Correlation Matrix 8.4 Algorithms for Non–Digital Beamformers 8.4.1 Partial Adaptive Nulling 8.4.2 Adaptive Nulling with Weight Constraints 8.5 Reconfigurable Arrays 8.6 Reconfigurable Elements 8.7 Time Modulated Arrays 8.8 Adaptive Thinning 8.9 Other Adaptive Array Alternatives 8.9.1 Beam Switching 8.9.2 Direction Finding 8.9.3 Retrodirective Array 8.9.4 MIMO