ABSTRACT:
A compact single-feed circularly-polarized (CP) wide
beam micro strip antenna is proposed for CNSS application.
The antenna is designed with a double-layer structure,
comprising a circular patch with two rectangular stubs along the diameter
direction and a parasitic ring right above it. The resonance frequency and the
CP characteristics are mainly controlled by the circular patch and the
rectangular stubs, respectively. The vertical HPBW (half power beam width)
could be widened by the parasitic ring. Experimental results show that the
measured vertical HPBW is approximately 140° and the measured out-of-roundness
for the horizontal radiation pattern is only 1.1 dB. Besides, it could maintain
good low-profile characteristics
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