Compact Single Wide Band-Notched Slot antenna using T-Stub with Large Bandwidth

A compact rectangular slot antenna with single wide band-notched characteristics is proposed. This co-planar waveguide (CPW) fed antenna is suitable for ultra wide band (UWB), X-, Kuand K-band applications. The patch of the antenna is a modified rectangular slot with T-stub structure in an elliptical slot etched in the radiating patch. This T-stub structure creates wide band notched at WLAN and ITU communication channels to avoid interference problem. A pair of a semi-circular structure is created in the ground for improvement in impedance matching at higher frequencies. The simulation is carried out using high frequency structure simulator (HFSS) which is finite element method (FEM) based tool. The proposed antenna has a broad bandwidth of 161% and a compact size of 14 x 14 mm2. The size and bandwidth for the proposed antenna have been compared to that of earlier work and it is found that the performance of the proposed antenna is far better. This antenna operates over a wide band in the frequency range from 3 to 28 GHz with VSWR < 2 except frequency range from 4.5 to 8 GHz. The frequency range from 4.5 to 8 GHz filters-out entire WLAN and lower ITU communication channels to avoid the interference problem with UWB. The omnidirectional radiation patterns of fabricated antenna are presented. A negative measured peak gain is seen in the notched band. The measured results of the fabricated proposed antenna have been compared with the simulated results for the return loss and a close agreement between both the results is observed. Index Terms – Elliptical slot, wide band-notched, semi-circle, T-stub, CPW.