Bandwidth enhancement of compact patch antennas by loading inverted “L” and “T” strips

Abstract

We propose simple designs of compact patch antennas with bandwidth enhancement. Firstly, an inverted “L” strip is loaded onto the corner of one radiating patch edge to create an additional resonant mode which can be combined with that one of the conventional patch to enhance the operating bandwidth. Secondly, the “L” strip is replaced by inverted “T” strip to improve further the bandwidth by creating two adjustable resonant modes. The two proposed patch antennas have the particularity of enhancing the bandwidth significantly without increasing their profile and their overall sizes. Two antenna prototypes are fabricated and tested. Measurements reveal that the patch antenna loaded with “L” strip has stable radiation characteristics with 5.2 times enhancement in the relative bandwidth compared with a conventional patch antenna. The antenna loaded with inverted “T” strip has wider bandwidth (6.25 times wider than the conventional patch) and covers the operating band 5.07–5.89 GHz (15%) with measured peak gain and peak efficiency of 6.25 dBi and 78%, respectively. The proposed antennas are easy to fabricate, have a low-profile, and exhibit good performances which make them good candidates to use in real wireless applications.

A compact microstrip feedline printed antenna with perturbed partial ground plane for UWB applications

“…The performance of the proposed antenna is analyzed in terms of compactness, BW, percentage BW and gain. A summary of the comparison presented in Table 3 reveals that percentage bandwidth of 134% is achieved which is better than 26,27,[29][30][31][32]34,37,38,40,41,43,44,46 and approximately equal to. 24,28,33,39 Although 24,25,28,33 has slightly higher percentage bandwidth but their dimension is larger than the proposed antenna.…”

A Novel Low-Cost Compact High-Performance Flower-Shaped Radiator Design for Modern Smartphone Applications

“…Recently, two compact broadband patch antennas were designed with inverted L- and T-shaped strips [ 21 ]. The reported work achieved (12.46; 15) % FIBW, (6.6; 6.25) dBi gain, and (84; 78) % radiation efficiency in the operational band.…”