Band Notched Triband Patch Antenna Incorporating a Modified Complementary Split Ring Resonator

This article discusses a simple rectangular patch antenna's design, analysis, and performance with truncated corners, loaded with a modified complementary split ring resonator (MCSRR) in the ground plane to produce band notching in the frequency range 2.40-2.48 GHz. The article does a detailed analysis for achieving the band notch characteristics using the MCSRR. The fabricated antenna operates in three bands, 2.31-2.39 GHz, 2.48-2.71 GHz, and 4.96-5.09 GHz. S-band frequencies are in licensed WLAN and WiMAX applications and the upper band in WLAN applications. The electrical dimension of the proposed antenna is
$0.37\ \lambda_{0}\times 0.31\lambda_{0}$
, and of the patch is
$0.18\ \lambda_{0} \times 0.2\ \lambda_{0} (\mathrm{f}_{0}=2.40 \text{GHz})$
. We achieve a 23.6% & 26.7% size reduction due to the proposed design (frequency & patch length). Inset feed technique is preferred to provide better impedance matching for multiband support. The fabricated prototype results show a good match in the response with the simulated values. The maximum gain measured is 4.4 dBi at 2.5 GHz.