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> Archives > Current Issues |
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 JEET, Vol. 13, No. 5, September 2018 |
Design of a Compact Antenna Array for Satellite Navigation System Using Hybrid Matching Network
Kyung-Young Jung |
| Area |
C - Electrophysics and Applications |
| Abstract |
An antenna arrays for a satellite navigation systems require more antenna elements to
mitigate multiple jamming signals. In order to maintain the small array size while increasing the
number of antenna elements, miniaturization technique is essential for antenna design. In this work, an
electrically small circular microstrip patch antenna with a 3 dB hybrid coupler is designed as an
element antenna, where the 3 dB hybrid coupler can yield the circularly polarized radiation characteristic.
The miniaturized element antenna typically has too large capacitance in GPS L1 and GLONASS G1
bands, making it difficult to match with a single stand-alone non-Foster matching circuit (NFMC) in a
stable state. Therefore, we propose a new matching technique, referred to as the hybrid matching
method, which consists of a NFMC and a passive circuit. This passive tuning circuit manages
reactance of antenna elements at an appropriate capacitance without a pole in the operating frequency
range. The antenna array is fabricated, and the measured results show a reflection coefficient of less
than -10 dB and an isolation of greater than 50 dB. In addition, peak gain of the proposed antenna is
increased by 22.3 dB compared to the antenna without the hybrid matching network. |
| Keyword |
Non-Foster matching,GPS,Antenna,Controlled reception pattern antenna (CRPA).
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