Parametric Study and Analysis of Modified Electromagnetic Band Gap in Frequency Notching of Ultra-Wide Band Antenna

Abstract

This paper presents parametric study of dual band notch ultra wideband (UWB) antenna using modified electromagnetic band gap. The Electromagnetic Band Gap (EBG) comprises of two strip patched and an edge-located via with respect to ground for dual notch band. The study was presented in order to have an improved knowledge of EBG characteristics and its effect on the notching band of a small squared ultra wideband antenna of size 24 by 31 mm2 dual band notch using HFSS software. The antenna operates within the return loss (s11< -10dB) 3.2 to 12.3 GHz. The simulation results show that the notched band between 4.57 – 4.99 GHz and 7.96 – 8.32 GHz corresponding to WLAN and ITU respectively was achieved. The effect of gap distance between the field line and EBG was demonstrated as well and the position of via with respect to the ground as a means for notched band centre frequency tuning. The antenna could be considered a good candidate for any UWB applications that must avoid narrow band interference. The research gives ideas on the best placement position of EBG structure along field line in UWB antenna frequency notching technique.

Development of a Triple Band Notched UWB Antenna

“…It can be observed that most of these studies [28][29][30][32][33][34] could only notch two frequencies away from the UWB band. Only the study presented by the authors in [26] was able to notch three frequencies in line with the results presented in this paper. However, the bandwidth covered is relatively lower compared to the current study presented in this paper.…”

“…The novelty of the design lies in the combination of a modified EBG and a slot for frequency notching. This method successfully notched three frequencies with only two notching devices, unlike the conversionary method, which could notch only one frequency per notching device [24][25][26]. The analysis shown in this study revealed that a triple-band frequency notch could be achieved without degrading the performance of the antenna.…”

“…In Equation 5, frf is the resonant frequency due to the fringing effect, while the factor 𝑓𝑓 𝑟𝑟𝑒𝑒 /𝑓𝑓 𝑟𝑟 denotes the fringe factor (length reduction factor). Both W and L are determined using Equations 6 and 7 [26].…”