Bandwidth improvement of a circularly polarised printed monopole antenna using a lumped capacitor. Issue 13 (2nd June 2016)

• Record Type: Journal Article
• Authors: Hoang, T.V.; Le, T.T.; Park, H.C.
• Is Part Of: Electronics letters. Volume 52:Issue 13(2016)
• Page Start: 1091
• Page End: 1092
• Publication Date: 2016-06-02
• Subjects: monopole antennas -- microstrip antennas -- antenna radiation patterns -- capacitors; circularly polarised printed monopole antenna -- lumped capacitor -- axial‐ratio bandwidth improvement -- ARBW improvement -- inverted‐U‐shaped patch antenna -- reflection bandwidth; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.1277
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Axial‐ratio bandwidth (ARBW) improvement of a circularly polarised printed monopole antenna using a lumped capacitor is presented. To demonstrate the effectiveness of this approach, a lumped capacitor is attached in the gap of an inverted‐U‐shaped patch antenna having a narrow 3 dB ARBW. Simulation shows that the ARBW improves from 4.1% (5.68–5.92 GHz) to 30.7% (4.33–5.9 GHz) with the use of a 0.5 pF capacitor. The measured results show a −10 dB reflection bandwidth of 60.5% (3.75–7 GHz), and a 3 dB ARBW of 33.3% (4.25–5.95 GHz). The advantage of the proposed design is that the 3 dB ARBW of an antenna can be easily tuned and extended with the use of only one lumped capacitor.