Beamwidth-Enhanced Low-Profile Dual-Band Circular Polarized Patch Antenna for CNSS Applications

Abstract EN

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.