A Novel Compact Microstrip Antenna with an Embedded λ/4 Resonator

Table 3

Comparison of various compact MAs.

Ref.	Methods	Freq. (GHz)	Size	Gain (dB)	Substrate	FBW (%)
[22]	Defected ground structure	2.45	0.2λg × 0.32λg	2.35	4.4	6.12
[23]	Magneto-dielectric metasubstrate	2.35	0.13λg × 0.17λg	1.34	3.5	0.89
[24]	Sierpinski carpet slot	2.45	0.19λg × 0.28λg	2.69	4.7	2.85
[25]	Loaded split-ring resonators	2.406	0.27λg × 0.27λg	−2.02	4.02	1.04
The proposed antenna	Embedded λ/4 resonator	2.59	0.22λg × 0.30λg	4.0	2.65	1.16

FBW: fractional bandwidth; λ_g: guide wavelength.