Electronically Scanned Arrays (Synthesis Lectures on Antennas)

Description

Scanning arrays present the radar or communications engineer with the ultimate in antenna flexibility. They also present a multitude of new opportunities and new challenges that need to be addressed. In order to describe the needs for scanned array development, this book begins with a brief discussion of the history that led to present array antennas. This text is a compact but comprehensive treatment of the scanned array, from the underlying basis for array pattern behavior to the engineering choices leading to successful design. The book describes the scanned array in terms of radiation from apertures and wire antennas and introduces the effects resulting directly from scanning, including beam broadening, impedance mismatch and gain reduction and pattern squint and those effects of array periodicity including grating and quantization lobes and array blindness. The text also presents the engineering tools for improving pattern control and array efficiency including lattice selection, subarrray technology and pattern synthesis. Equations and figurers quantify the phenomena being described and provide the reader with the tools to tradeoff various performance features. The discussions proceed beyond the introductory material and to the state of the art in modern array design. web-book.pdf......Page 0 INTRODUCTION......Page 11 A HISTORICAL PERSPECTIVE......Page 13 ANTENNA AND ARRAY CHARACTERISTICS......Page 18 Array Scanning: Linear Array......Page 20 Array Pattern Shape and Beamwidth......Page 21 Array Pattern `Squint' and Bandwidth......Page 23 Grating Lobes of Linear Arrays......Page 25 Grating Lobes of Planar Arrays......Page 28 Array Directivity Equations......Page 31 MULTIPLE BEAM NETWORKS......Page 32 Array Element Patterns......Page 37 Array Element Patterns for Single and Multi-mode Elements......Page 39 The Radiation of a Single Wire or Aperture......Page 40 Radiation from a Dipole......Page 42 Radiation from a Dipole in an Array of Terminated Dipoles......Page 45 ARRAY ELEMENT PATTERNS IN AN INFINITE ARRAY......Page 47 Finite Arrays and Wide-Band Arrays......Page 52 SYNTHESIS TECHNIQUES FOR SECTOR PATTERNS......Page 55 The Woodward Method......Page 56 SYNTHESIS OF PENCIL BEAM PATTERNS......Page 58 Taylor Line Source Synthesis......Page 59 Bayliss Line Source Synthesis......Page 61 NUMERICAL TECHNIQUES FOR SYNTHESIS......Page 63 The Alternating Projection Method......Page 64 INTRODUCTION......Page 69 Aperiodic Arrays of Subarrays......Page 74 Pulse Shaped Subarray Pattern for Quantization Lobe Suppression (Overlapped subarrays)......Page 76 Overlapped Subarray Synthesis of Flat-Topped Patterns......Page 80