Wideband Circularly Polarized Microstrip-Slot Antenna with Parasitic Ground Planes

Table 2

Comparison of the designed antenna with previously reported antenna.

Reference Antenna	Type	Antenna size (λ0^3)	−10-dB IBW (%)	3-dB ARBW (%)	CP bandwidth	Peak gain (dBi)
[13]	Four notched circular-patches + a single-stage transition	1.16 × 1.16 × 0.013 at 2.5 GHz	8	4.8	4.8	7.5
[15]	Four strips + four rectangular patches + four square-patches	1.47 × 1.47 × 0.028 at 5.5 GHz	15.8	11.8	11.8	12.5
[37]	Four cut-truncated square-patches + four strip lines	1.38 × 1.38 × 0.028 at 5.5 GHz	18	12.7	12.7	12
[15]	Four square patches + four parasitic rectangular elements	1.45 × 1.45 × 0.028 at 5.5 GHz	15.9	11.8	11.8	12.5
[39]	Four cut-truncated square-patches + four square-patches	0.92 × 0.92 × 0.028 at 5.5 GHz	19.5	12.9	12.9	9.8
[43]	An annular ring + a parasitic circular patch	0.67 × 0.67 × 0.043 at 0.915 GHz	10.6%	6%	6%	8.9
[44]	A parasitic L-shaped patch + four parasitic square-patches	0.80 × 0.80 × 0.076 at 5.6 GHz	38	28.1	28.1	8.4
[45]	Four L-shaped patches with L-shaped slots + four square patches + a corner-truncated square patch	0.95 × 0.95 × 0.12 at 5.6 GHz	25.5	16.7	16.7	10.8
[46]	Eight corner-truncated parasitic square-patches	0.92 × 0.92 × 0.073 at 5.6 GHz	33.6	19.4	19.4	10.2
Proposed	Four square patches + four square slots + four grounded metal-columns	1.03 × 1.03 × 0.028 at 5.6 GHz	36.4%	25.1	25.1	10.1

λ₀ is the free space wavelength at the center frequency of the overlapped band.