Abstract
A low-profile dual-band circular polarized (CP) patch antenna with wide half-power beamwidths (HPBWs) is presented for CNSS applications. Simple stacked circular patches are used to achieve dual-band radiation. To enhance the HPBW for the two operation bands, a dual annular parasitic metal strip (D-APMS) combined with reduced ground plane (R-GP) is presented. A single-input feed network based on the coupled line transdirectional (CL-TRD) coupler is also proposed to provide two orthogonal modes at the two frequency bands simultaneously. Experimental results show that the 10 dB impedance bandwidth is 32.7%. The 3 dB axial ratio (AR) bandwidths for the lower and upper bands are 4.1% and 6.5%, respectively. At 1.207 GHz, the antenna has the HPBW of 123° and 103° in the xoz and yoz planes, separately. And the values are 127° and 113° at 1.561 GHz.
Highlights
Satellite navigation systems are intensively used in various fields, such as navigation, public safety, and surveillance. e compass navigation satellite system (CNSS), officially named as the BeiDou Navigation Satellite System, has achieved more and more attention due to the navigation and positioning services compatible with other systems [1]
To investigate the effects of APMS and reduced ground plane (R-GP) on the halfpower beamwidths (HPBWs) of the CP microstrip antennas (CPMAs), a single-band circular patch antenna working at 1.561 GHz is simulated
It starts from antenna 1, which is composed of a circular patch and a GP. e antenna 2 is a circular patch antenna with an APMS etched on the same layer, while the size of the GP is the same as that of the substrate. e antenna 3 is a circular patch antenna with an R-GP, and no APMS is used
Summary
Satellite navigation systems are intensively used in various fields, such as navigation, public safety, and surveillance. e compass navigation satellite system (CNSS), officially named as the BeiDou Navigation Satellite System, has achieved more and more attention due to the navigation and positioning services compatible with other systems [1]. To receive signals with stable capacity, most satellite navigation systems use circularly polarized (CP) antennas. Metal back cavity [3,4,5] or the similar structure of back cavities [6] is applied to enhance the HPBW of CP antennas They suffer from high profile, and their complex in geometry may lead to fabrication difficulties. Parasitic strips [8] are proposed to achieve wide HPBW. These technologies [3,4,5,6,7] are presented for single-band applications
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