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

Table 1

Resonant frequency varied with S.

The gap S (mm)	Resonant frequency (GHz)	S11 (dB)
0.2	2.53	−17.68
0.4	2.62	−19.22
0.6	2.68	−19.89
Traditional MA	3.45	−18.15