Reconfigurable Band-Notched Slot Antenna Using Short Circuited Quarter Wavelength Microstrip Resonators

Abstract

Abstract-In this paper, a CPW feed ultrawideband (UWB) slot antenna with a single reconfigurable notched band is proposed for overlay cognitive radio (CR) systems. The proposed antenna utilizes two symmetrical short circuited quarter wavelength resonators at the top layer and close to the ground to create a single notch. The switching reconfiguration is achieved by changing the length of resonators to prevent the interference to the primary users that are operating in the wireless local area network (WLAN) band at 5.725-5.825 GHz and the international telecommunication union (ITU) band at 8.05-8.4 GHz. The center frequency of the notched band can be tuned by selecting the length of the resonators, which is achieved by employing two ideal switches. Moreover, the proposed antenna has been fabricated and tested. The experimental data confirmed that the proposed design can selectively have a band notch over the two existent desired bands.

A state-of-art review on band-notch characteristics in UWB antennas

“…Although the authors have tried at their level best in including the important and novel contribution of the researchers in this review article, still the authors apologize to the researcher community if any significant contribution is skipped unknowingly and unintentionally. [186][187][188][189]192,195,196,204,207 Reconfigurable 184-209 192,193,[195][196][197][198][199][200][201][202][203]207,193,195,203,204 Others 185,187,190,191,208,209…”

“…However, such antennas when encounter an interfering signal, they generate band notch function by changing their configuration which then eliminate interference with the coexistent system. The reconfiguration of the antenna structures can be achieved by employing different kind of RF switches such as PIN diodes, RF MEMS and metal semiconductor field effect transistor (MESFET) …”

“…A filtenna with reconfigurable band rejection ability is presented in using RF switches. Length of the short‐circuited stub lengths are varied by adding RF switches to obtain reconfiguration functioning . Li et al, have integrated three numbers of ideal switches into the T‐shaped stepped impedance resonator (SIR) and parallel stub loaded resonator for obtaining notch band reconfigurable characteristics.…”

“…Length of the short-circuited stub lengths are varied by adding RF switches to obtain reconfiguration functioning. 203 Li et al, 204 have integrated three numbers of ideal switches into the T-shaped stepped impedance resonator (SIR) and parallel stub loaded resonator for obtaining notch band reconfigurable characteristics. Likewise they have developed a circular slot UWB antenna with multimode reconfigurable dual band-notched characteristics in.…”

“…Further, in Section 6 quad−/multiple‐notch based antenna configurations are investigated. The discussion also includes description of different reconfigurable configurations with notched bands in Section 7 . A summary of this review process is highlighted in Section VIII.…”