Abstract
In this paper, a guitar shape ultra-wideband (UWB) antenna having wide stop band along with altered ground layer is analyzed, manufactured and tested experimentally for wireless applications. The proposed UWB structure has overall size of 30 × 30 × 1.6 mm3 and has an impedance bandwidth of 7.5 GHz (3.1–10.6 GHz). A pair of inverted L shape and parallel I shape metallic stubs are added to UWB antenna to achieve a wide stop band from 3.1 to 5.8 GHz, therefore eliminating both undesired WiMAX and WLAN bands. Experimental results show that in the stop band region the measured values of maximum attenuation, VSWR, radiation efficiency and gain are − 1.07 dB, 18.7, 0.05 and − 7 dB respectively. Additionally, in passband region, the antenna exhibits omnidirectional radiation characteristics, good reflection coefficient, highest radiation efficiency and gain value of 0.82 and 5.8 dB. Effect of variation of metallic stubs (L and I) parameters on wide stop band along with equivalent circuit analysis is also investigated. The bandwidth of rejected band can be tuned easily by varying coupling gap between the patch antenna and metallic stubs. The proposed antenna structure is designed, optimized and simulated by utilizing computer simulation technology microwave studio software and further measured outcomes are in good agreement with simulated one.
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