Efficiency calculation of feed structures and optimum number of antenna elements in a subarray for highest G/T

Demir Ş.

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol.52, no.4, pp.1024-1029, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52 Issue: 4
  • Publication Date: 2004
  • Doi Number: 10.1109/tap.2004.825685
  • Journal Name: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1024-1029
  • Keywords: antenna arrays, antenna array feeds, noise, phased arrays
  • Middle East Technical University Affiliated: Yes

Abstract

For an antenna array, different feed structure topologies may yield the same radiation characteristics. However, different topologies may result in different efficiency and noise performance. In this paper, parallel arm antenna arrays are analyzed for efficiency and noise temperature using the noise equivalent line length method (NELL) with the number of antenna elements in a subarray as a parameter. It is shown that efficiency of an antenna array feed structure as well as its noise temperature can be calculated using the NELL method. The comparison of the two parameters, efficiency and noise temperature, yield the optimum number of antenna elements in a subarray of a parallel arm antenna array for the highest G/T ratio.