Design and Simulation of Multiband Circular Microstrip Patch Antenna with CSRR for WLAN and WiMAX Applications

In this work, a single-feed circular microstrip patch antenna was proposed, designed and optimized for WLAN and WiMAX applications. The proposed antenna was printed on FR-4 dielectric substrate material with a relative permittivity (er) of 4.4, a loss tangent (tan ẟ) of 0.02 and a height (h) of 1.6 mm. The characteristics of the proposed antenna were improved by etching two square-shaped Complementary Split Ring Resonators (CSRR) on a partial ground plane and one square-shaped CSRR on the main circular patch radiator. Radius of the circular patch is 12 mm and the overall size of the structure is being 50 × 40 × 1.6 mm3. The proposed design is a multiband antenna resonating at four resonant frequencies and operating at two frequency bands. The antenna covers the frequency band extending from 2.2995 GHz to 2.84 GHz with a bandwidth of 540 MHz and the frequency band extending from 3.36 GHz to 5.9273 GHz with a bandwidth of 2.5673 GHz. The antenna resonates at 2.52 GHz, 3.48 GHz, 5 GHz and 5.52 GHz achieving peak gains of 2.52 dB, 2.5416 dB, 3.014 dB and 4 dB respectively. The proposed antenna may be applied for WLAN/WiMAX applications. The design and simulation were performed using the High Frequency Simulator Software (HFSS).