http://iet.metastore.ingenta.com
1887

Electronically Steered Arrays

Electronically Steered Arrays

For access to this article, please select a purchase option:

Buy chapter PDF
£10.00
(plus tax if applicable)
Buy Knowledge Pack
10 chapters for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Antennas: Fundamentals, design, measurement — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This chapter discusses electronically steered arrays (ESAs), also commonly called phased arrays. These antennas have beams that can be electronically steered in pointing direction or beam shape, without mechanical motion, and accomplished in microseconds. Although the operation of all arrays depends on the proper phasing of the individual array elements, the terms ESA and phased array have by usage come to mean an array in which the beam is steered in direction and shape by varying the phasing of the elements. Present day ESA (or phased array) technology includes adaptive beam forming (ABF), which merges rapid beam pointing and shaping with digital signal processing separately. With ABF arrays, the phasing and time delaying of the signals from individual elements are jointly adaptively adjusted and then summed to rapidly beam point, beam shape, and Doppler filter desired received signals. In this way, the received signal output, from the summed individual array signals, may be optimized, simultaneously, for both the strength of the desired signal relative to thermal noise and relative to interference from undesired signals.

Chapter Contents:

  • 8.1 Phased Array Principles
  • 8.1.1 Time Delay and Phase Shift Requirements
  • 8.1.2 Effective Aperture Versus Scan Angle
  • 8.1.3 Frequency-Scan Antennas
  • 8.1.4 Array Bandwidth
  • 8.1.5 Phased Array Patterns
  • 8.1.6 Grating Lobes
  • 8.2 Beam-Steering Technology
  • 8.2.1 Phase Shifters
  • 8.2.2 Effects of Phase Quantization
  • 8.2.3 Effects of Element Mutual Coupling
  • 8.2.4 Time Delayers
  • 8.3 Phased Array Feed System Technology
  • 8.3.1 Feed Systems
  • 8.3.2 Active Arrays and T/R Modules
  • 8.3.3 Alternative Confi gurations, Including Subarrays
  • 8.3.4 Butler Matrix
  • 8.3.5 Array Sum and Difference Patterns
  • 8.3.6 Microstrip and Printed-Circuited Technology
  • 8.3.7 Conformal Arrays
  • 8.4 Adaptive Array Antennas
  • 8.4.1 Background System Developments
  • 8.4.2 Adaptive Beam-Forming Arrays
  • 8.4.3 Space-Time Adaptive Processing
  • 8.5 Examples of Electronically Steered Arrays
  • References
  • Problems and Exercises

Inspec keywords: thermal noise; adaptive signal processing; adaptive antenna arrays; antenna phased arrays; array signal processing

Other keywords: signal phasing; pointing direction; array signals; array element; rapid beam pointing; signal time delaying; rapid beam shaping; ESA; Doppler filter; digital signal processing; interference; electronically-steered arrays; thermal noise; adaptive beam forming; ABF arrays; phased arrays

Subjects: Signal processing and detection; Antenna arrays

Preview this chapter:
Zoom in
Zoomout

Electronically Steered Arrays, Page 1 of 2

| /docserver/preview/fulltext/books/ew/sbew040e/SBEW040E_ch8-1.gif /docserver/preview/fulltext/books/ew/sbew040e/SBEW040E_ch8-2.gif

Related content

content/books/10.1049/sbew040e_ch8
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address