Design of Electronically Steerable Passive Array Radiator (ESPAR) antennas

Koichi Gyoda, Takashi Ohira

Research output: Chapter in Book/Report/Conference proceedingConference contribution

105 Citations (Scopus)


Electronically Steerable Passive Array Radiator (ESPAR) antennas are proposed for low-cost analog adaptive beamforming. The configuration and design of these antennas and some simulation results, especially on their beam/null steering capability, are presented. From the results of a numerical analysis, it was found that 5-element ESPAR antennas can offer a beam gain of 9dBi ± 1dB and a null deeper than -50dBi in an arbitrary direction. In this case, the beam gain and null were obtained separately. It was also found that 7-element ESPAR antennas can achieve continuous steering in almost all directions, with a simultaneous 8dBi beam gain and -30dBi null, excluding the region where the direction of the beam and the direction of the null are within about 45-degrees however 5-element ESPAR antennas are unable to achieve steering in a number of directions, even with a simultaneous 5dBi beam gain and -15dBi null.

Original languageEnglish
Title of host publicationIEEE Antennas and Propagation Society International Symposium
Subtitle of host publicationTransmitting Waves of Progress to the Next Millennium, Held in Conjunction with: USNC/URSI National Radio Science Meeting, AP-S/URSI 2000
Number of pages4
Publication statusPublished - 2000 Dec 1
Externally publishedYes

Publication series

NameIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
ISSN (Print)0272-4693

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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