Abstract
A new single-feed circularly polarized (CP) microstrip antenna with the C-shaped parasitic strip is proposed in this paper. The proposed CP antenna is designed for the transmitting terminal in the Global Navigation Satellite System (GNSS). The square patch is surrounded by a C-shaped parasitic strip. By adjusting the parasitic strip dimension, the antenna CP operation is achieved. The main advantage of this method is that those two resonant modes for achieving the CP operation are independent from each other, which is liable to design and debug the proposed CP microstrip antenna. The designed CP microstrip antenna has the good impedance matching, the good CP radiation pattern, and the stable CP gain across the 3 dB AR (axial ratio) bandwidth.
Highlights
Introduction eCP antenna is extensively used in the Global Navigation Satellite System (GNSS) because of its advantages for improving the system sensitivity and reducing the polarization mismatch. ere are many kinds of CP antennas, like microstrip antenna, horn antenna, and helix antenna
By adjusting the parasitic strip dimension, two orthogonal modes will have the equal amplitudes and 90 deg phase difference for achieving the CP operation. e designed CP microstrip antenna has the good impedance matching, the good CP radiation patterns, and the stable CP gain across the 3 dB axial ratio (AR) bandwidth. e resonant modes for achieving the proposed CP antenna are independent from each other, which is convenient for the CP antenna design and debug
A reasonable good agreement between the simulation and the measurement is achieved. e CP gain is relatively stable across the 3 dB AR band, and its value ranges from 4.0 dBic to 4.2 dBic. e 3 dB AR bandwidth is 10 MHz. e designed antenna has the peak gain at the frequency where the AR value is the lowest. e deteriorative antenna circular polarization performance will worsen the antenna gain
Summary
1.575 GHz N.A. 2.54 GHz 6.4% 2.53 GHz 4.3% 1.615 GHz 9.1% 1.575 GHz 2.5% 1.35 GHz 32% 1.575 GHz 1.9% 925 MHz 5.4%. Φ0.42λ0 × 0.016λ0 0.2λ0 × 0.2λ0 × 0.005λ0 0.24λ0 × 0.24λ0 × 0.017λ0 0.22λ0 × 0.22λ0 × 0.005λ0
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