Dual band‐notched annular monopole antenna with tunable structure for UWB application

Abstract

A novel annular monopole antenna with a dual‐band rejection characteristic for ultra‐wideband (UWB) applications is proposed.This antenna comprises an annular‐shape radiating element with a tuning stub and a backside elliptical radiating element that is connected to it by a shorting pin, to create dual‐notched bands at 3.2–4.4 GHz and 4.8–5.9 GHz across the UWB frequency band from 2.5 to 14.5 GHz, to filter the WIMAX and WLAN signals. Measurements demonstrate that the proposed antenna provides a very large bandwidth from 2.5 to 14.5 GHz (141%, voltage standing wave ratio 2). A good monopole‐like radiation pattern except the notched bands is obtained. Details of the proposed antenna design and the simulated results are presented and discussed. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1546–1549, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27609

Modified theta‐shaped monopole antenna with defected ground structure for UWB applications

“…The printed monopole antennas have drawn great attention in UWB applications due to their unique characteristics of low cost, low profile, light weight, wide impedance bandwidth, easy fabrication, omnidirectional radiation pattern, and easy integration with other microstrip circuits. The printed monopole antenna structures available in the literature include coplanar waveguide-fed structures with different shapes of radiators, modified feedline, and ground plane structures [2][3][4][5][6][7][8][9][10][11][12]. The disadvantage with these already reported structures is their large size.…”