The New C-Shaped Parasitic Strip for the Single-Feed Circularly Polarized (CP) Microstrip Antenna Design

Table 1

Comparison of this work and previous published CP antennas.

Ref.	Method to achieve the CP operation	Dielectric constant	Operating frequency	10 dB BW	3 dB AR BW	Antenna size	Network required	Independent resonant modes
[3]	Feeding network	2.33	1.575 GHz	N.A.	N.A.	0.61λ0 × 0.008λ0	Yes	No
[5]	Fractal structure	2.2	2.54 GHz	6.4%	2%	0.35λ0 × 0.35λ0 × 0.027λ0	No	No
[7]	Metallic pins	2.2	2.53 GHz	4.3%	1.15%	1.26λ0 × 1.26λ0 × 0.027λ0	No	No
[9]	Rectangular stubs	4.4	1.615 GHz	9.1%	1%	0.38λ0 × 0.38λ0 × 0.024λ0	No	No
[10]	Octagon-star shaped patch	2.164	1.575 GHz	2.5%	0.5%	φ0.42λ0 × 0.016λ0	No	No
[12]	Feeding network	6	1.35 GHz	32%	32%	0.2λ0 × 0.2λ0 × 0.005λ0	Yes	No
[18]	DGS	10	1.575 GHz	1.9%	0.4%	0.24λ0 × 0.24λ0 × 0.017λ0	No	Yes
[19]	Two parasitic strips	4.4	925 MHz	5.4%	0.65%	0.22λ0 × 0.22λ0 × 0.005λ0	No	No
This work	Single C-shaped parasitic strip	10	1.65 GHz	1.9%	0.61%	0.36λ0 × 0.36λ0 × 0.017λ0	No	Yes