Ultra‐wideband square planar monopole antenna for IEEE 802.16a operation in the 2–11‐GHz band

Abstract

A new square planar monopole antenna capable of providing a very wide impedance bandwidth of larger than 10 GHz is presented. The ultra‐wideband property for the proposed antenna is achieved by using a new impedance‐matching technique of cutting a pair of notches at the two lower corners of the square planar monopole. With suitable dimensions of the notches chosen, the impedance bandwidth of the proposed antenna can be greatly enhanced to be larger than four times that of a corresponding simple square planar monopole antenna (about 10.7 versus 2.5 GHz in this study). A constructed prototype with an ultra‐wideband property covering the 2–11‐GHz band for IEEE 802.16a operation is presented and discussed. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 463–466, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20337

Ultra-Wideband Antenna and Design

“…From the antenna geometry, the feed gap, the feed point location and the shape of the monopole's bottom, all may affect the impedance matching. Thus, several techniques such as notching, bevelling, double feed, trident-shaped feed, and etc., were proposed to expand the bandwidth of the square monopole antenna, as shown in Fig.10 i.e., Su et al [15] proposed a method of cutting a pair of notches at the two lower corners of the square planar monopole. With suitable dimensions of the notches chosen, the impedance bandwidth can be greatly enhanced to be about 3 times that of a corresponding simple square planar monopole antenna (2~12.7 GHz compared to 2~4.5 GHz).…”

From L-shaped planar monopoles to a novel folded antenna with wide bandwidth

“…The first geometric parameter analysed is the feed gap, fg. This parameter has been demonstrated to be very critical for the matching of an L-shaped monopole [3,10,11]. Indeed it does affect strongly the capacitive coupling of the radiating element with the ground plane at the hottest region of the antenna.…”

“…Thanks to an intrinsic broad impedance bandwidth, planar monopoles show powerful features for those applications and different feeding techniques can easily be applied to this technology to obtain further benefits [1][2][3]. Low-profile antennas are particularly interesting for mobile or indoor applications, so that a compromise between size and performance becomes a crucial part of the design [4][5][6][7][8].…”

“…Compared to typical planar monopole antennas [2,3], this novel radiating element allows a reduction of the total height by 33%. At the same time, a 10 dB return loss bandwidth and acceptable radiation patterns are achieved from 1.6 GHz to 7.5 GHz.…”

Systematic design of antennas using the theory of characteristic modes

“…Before finishing this section it should be highlighted that the double fed square monopole presented in [128] has inspired other authors that later have proposed other monopoles based on the same design concept [135]- [136]. Multiple Input Multiple Output (MIMO) systems are a very up-to-date solution to face the growing capacity demand for new wireless communication systems.…”