Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 17, Issue 9, Pages 1697-1701Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2018.2864172
Keywords
Circularly polarized antenna; high-polarization purity; Ka-band antenna array; wide axial-ratio (AR) angular beamwidth antenna
Funding
- Iraqi Ministry of Higher Educations and Scientific Researches
- C-COM Satellite Systems Inc.
- National Science and Engineering Research Council (NSERC) of Canada
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This letter presents the design of a wideband circularly polarized antenna, operating at Ka band. The proposed antenna comprises a circular microstrip patch antenna that is coupled to a microstrip feedline through a modified L-shaped aperture slot. The antenna radiates a wideband right-hand circularly polarized wave with high polarization purity and a wide axial ratio (AR) angular beamwidth. A 4 x 4 antenna subarray has been designed, fabricated, and measured to validate the proposed concept. The array exhibits a reflection coefficient S-11 < - 10 dB over the frequency band 27-31 GHz. Moreover, the 4 x 4 antenna subarray yields a high level of polarization purity, as well as a flat measured AR <= 1.15 dB over the frequency range 27.55-30.45 GHz (10% bandwidth).
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