A Sequentially Rotated, Circularly Polarized Microstrip Antenna Array with Reduced Mutual Coupling

Mohammad Fairouz, Mohammad A. Saed

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A circularly polarized microstrip patch antenna array with sequential rotation and reduced mutual coupling between its elements is proposed. A microstrip patch modified to suppress surface waves is used as the array element. The modifications include the addition of shorting pins and inclusion of a slot and edge truncations to produce a circularly polarized array element that does not excite surface waves. The designed element has higher gain and a more directional radiation pattern than a similar conventional microstrip patch antenna. In order to improve circular polarization bandwidth, sequential rotation techniques using the proposed microstrip antenna were investigated. Surface wave supersession of a 2 x 2 sequentially rotated array using the proposed design was achieved throughout the entire axial ratio bandwidth. One-layer directly fed array and two-layer aperture coupled array were investigated. The two-layer design achieved better impedance and axial ratio bandwidths than the single layer design. The design procedure, simulation results, and experimental measurements are presented.

Original languageEnglish
Pages (from-to)422-433
Number of pages12
JournalElectromagnetics
Volume36
Issue number7
DOIs
StatePublished - Oct 2 2016

Keywords

  • Microstrip antennas
  • circular polarization
  • sequential rotation
  • surface wave reduction

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