Design of leaky‐wave antenna with wide beam‐scanning angle and low cross‐polarisation using novel miniaturised composite right/left‐handed transmission line. Issue 7 (1st May 2016)

• Record Type: Journal Article
• Authors: Wu, Guo‐Cheng; Wang, Guang‐Ming; Peng, Hua‐Xia; Gao, Xiang‐Jun; Liang, Jian‐Gang
• Is Part Of: IET microwaves, antennas & propagation. Volume 10:Issue 7(2016)
• Page Start: 777
• Page End: 783
• Publication Date: 2016-05-01
• Subjects: leaky wave antennas -- electromagnetic wave polarisation -- metamaterial antennas -- antenna radiation patterns -- microwave antennas; leaky‐wave antenna design -- wide‐beam‐scanning angle -- cross‐polarisation -- miniaturised composite right‐left‐handed transmission line -- metallic holes -- interdigital lines -- miniaturised CRLH TL -- parasitic resonant mode -- continuous phase constant -- balanced CRLH TL -- continuous beam‐scanning property -- periodic LWA -- co‐polarisation -- radiation region -- wireless communication systems -- high‐resolution radar system -- electromagnetic performance -- frequency 3.90 GHz to 4.90 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2015.0462
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : In this study, a novel periodic leaky‐wave antenna (LWA) with wide beam‐scanning angle and low cross‐polarisation is proposed by using miniaturised composite right/left‐handed transmission line (CRLH TL). By introducing the metallic holes loaded in the interdigital lines of the miniaturised CRLH TL, not only the parasitic resonant modes can be eliminated, but also the miniaturisation is realised. Considering the continuous phase constants from negative to positive values of the balanced CRLH TL, a continuous beam‐scanning property from backward to forward of the resultant LWA can be obtained. For verification, a periodic LWA, which consists of 20 unit cells of the balanced CRLH TL, is fabricated and measured; the measured and simulated results are in good agreements with each other, indicating that the fabricated LWA operates from 3.90 to 4.90 GHz (a bandwidth of 22.7%), and has a wide continuous beam‐scanning capability from backward −61° to forward 67° (including the broadside) within the operating band. Moreover, it also has very low cross‐polarisation, which remains at a level of at least 25 dB below the co‐polarisation across the entire radiation region. As a result, the presented LWA should find promising applications in modern wireless communication systems and the high‐resolution radar system due to these wonderful electromagnetic performances.