Frequency and Time Domain Analysis of Hybrid Triple-band-notched UWB Antenna

Abstract

This paper presents the analysis of a hybrid triple frequency notched ultra-wideband (UWB) antenna in the time and frequency domain. The triple-notched band was achieved by combining a modified electromagnetic band gap (MEBG) structure placed in nearness to the radiator feed and a slot element etched on the radiator. For analysis, the antenna was arranged in transmit and receive mode with a 120 mm far-field separation distance. The antenna was characterized in the frequency domain using the return loss, gain, and directivity, while the time domain focuses on the reflection coefficients at the two input ports, group delay, and fidelity factor. Less than -10 dB was achieved for the return loss. It could be observed that the received and transmitting signals are identical with fidelity of 0.992 for face-to-face and 0.928 face-to-side respectively. Also, in the frequency domain, the antenna directive gain at face-to-face and at face-to-side is given as 2.24dBi and 2.078dBi, respectively. The antenna group delay has stable characteristics in the UWB frequency band, with values less than 1 ns variation in the entire frequency band. Thus, this confirmed that the transmission performance of the antenna is linear, which is good for any applications that use UWB.