Equilateral Triangular Slot Antenna for Communication System and GNSS RO Sensor of GAIA-I Microsatellite

Asif AWALUDIN  Josaphat TETUKO SRI SUMANTYO  Koichi ITO  Steven GAO  Achmad MUNIR  Mohd ZAFRI BAHARUDDIN  Cahya EDI SANTOSA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E101-B   No.3   pp.835-846
Publication Date: 2018/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3183
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
slot antenna,  circular polarization,  wideband antenna,  reflector,  GNSS,  microsatellite,  

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Summary: 
Two wideband circularly polarized (CP) equilateral triangular slot (ETS) antennas are proposed for communication system and the Global Navigation Satellite System (GNSS) Radio Occultation (RO) sensor of the GAIA-I microsatellite. These wide slot antennas use the ring slot antenna CP generation method due to their shape. The compact antennas employ truncated corners, grounded equilateral triangular perturbation patch and branched feed line to create CP radiation. A 3-dB axial ratio bandwidth (ARBW) enhancement is achieved by inserting a pair of slits into the ETS. A parametric study on the influence of those shape modifications in reflection coefficient and axial ratio is presented. An ETS antenna for communication system of the GAIA-I is fabricated and measured, which is shown to agree well with its simulated performance by providing CP fractional bandwidth of 52%. An ETS antenna designed for the GNSS RO sensor of GAIA-I delivers 3-dB ARBW of 41.6%. The ETS antenna offers uni-directional radiation by mounting a 3D printed truncated cone reflector underneath which also enhances antenna gain.