Abstract
A wideband circularly polarized (CP) antenna is presented to achieve enhanced impedance, axial ratio (AR), and gain bandwidths. The antenna consists of two circular patches, a split-ring microstrip line with six probes, and a circular ground plane. By using these six probes which are placed in sequence on the split-ring microstrip line, the operating bandwidth of the proposed antenna is increased. The characteristic mode method is used to analyze different modes of the antenna and reveal the mechanism of extending the 3-dB AR bandwidth. Measured results show that the proposed antenna obtains an impedance bandwidth of 1.486–2.236 GHz (40.3%) for S11 ≤ −18 dB, a 3-dB AR bandwidth of 1.6–2.2 GHz (31.6%), and a boresight gain of 8.89 ± 0.87 dBic.
Highlights
With the development of many wireless systems, such as radar, satellite communication, remote control, and telemetry systems, there are more and more applications of circularly polarized (CP) antennas because CP antennas allow for reduction of multipath fading, avoiding polarization mismatching, and better weather adaptability
A CP antenna fed by an L-probe is presented with a 3-dB axial ratio (AR) bandwidth of 9%, which uses two stacked folded patches [2]
E simulated and measured S11 of the proposed antenna are shown in Figure 17(a). e measured impedance bandwidth for S11 ≤ −18 dB is 40.3% from 1.486 to 2.236 GHz
Summary
With the development of many wireless systems, such as radar, satellite communication, remote control, and telemetry systems, there are more and more applications of circularly polarized (CP) antennas because CP antennas allow for reduction of multipath fading, avoiding polarization mismatching, and better weather adaptability. A coplanar parasitic ring slot patch is introduced to achieve good circular polarization performance with a 3-dB AR bandwidth of 16% [5]. In [10], a driven patch with a square ring, a 270° loop of microstrip line, and an L-shaped parasitic patch is used to excite four square parasitic patches to achieve a 3dB AR bandwidth of 28.1%. In [13], a quasi-magnetic-electric CP patch antenna with a single feed is studied, which can achieve a 3-dB AR bandwidth of 15.3%. In [15], four cross slots via a microstrip feed line with multiple matching segments are used to excite a square patch, and a 3-dB AR bandwidth of 16% is achieved.
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