A Compact Single-Feed Circularly Polarized Microstrip Antenna with Symmetric and Wide-Beamwidth Radiation Pattern

Table 2

The effects of parameters ℎ₂, 𝑊₁, 𝑊₂, and 𝐷₁ on the center operating frequency, HPBW, and 3 dB beamwidth of the antenna.

Performance	ℎ2 (mm)			𝑊1 (mm)			𝑊2 (mm)			𝐷1 (mm)
	2.16	3.16	4.16	40	45	50	10	15	20	5.5	6.5	7.5
𝑓𝑐 (GHz)	1.47	1.56	1.63	1.735	1.56	1.44	1.46	1.56	1.71	1.58	1.56	1.55
RHCP gain (dBic)	4.72	4.74	4.74	5.01	4.74	4.36	4.46	4.74	4.95	4.76	4.74	4.63
HPBW (°)	−55–55	−55–55	−55–55	−53–53	−55–55	−56–56	−56~56	−55~55	−54~53	−55~55	−55~55	−54~53
3 dB AR coverage (°)	−86–86	−96–97	−99–99	−105–105	−96–97	−82–82	−87~87	−96~97	−103~103	−94~94	−96~97	−94~95