Slotted Tree-Shaped Microstrip Patch Antenna Using SSRR for Wide-band Applications

This paper presents a new design of a multiband antenna for multiband applications. To enhance the bandwidth and return loss characteristics, three Square split ring resonators (SSRRs) and two inverted U-slots on a partial ground were applied in this design. The antenna has a size of $40 \times 41 \times 1.6$ mm3, printed on FR-4 dielectric material with height (h) of 1.6 mm, loss tangent () of 0.02 and dielectric constant () of 4.4. Antenna parameters such as return loss (), gain, voltage standing wave ratio (VSWR), radiation pattern were simulated and analyzed. The antenna has two frequency bands. The first band (2.74GHz - 7.48GHz) in which the antenna resonates at frequencies, 3.37 GHz, 5.15 GHz, 6.64 GHz, 7.4 GHz and the second band (8.23 GHz - 9.8 GHz) with a center frequency at 9 GHz. Fractional bandwidths (< -10 dB) of 140%, 91.8%, 71.7% and 63.9% in the first band and 15.9% in the second band were achieved respectively. Furthermore, 3.3 dBi, 3.5 dBi, 3.244 dBi, 3.437 dBi and 3.937 dBi were provided at the resonant frequencies respectively. The simulation and numerical analysis were carried out using HFSS software.