Compact helical antenna with small ground fed by spiral‐shaped microstrip line. Issue 5 (1st February 2014)

• Record Type: Journal Article
• Authors: Liu, Longsheng; Li, Yue; Zhang, Zhijun; Feng, Zhenghe
• Is Part Of: Electronics letters. Volume 50:Issue 5(2014)
• Page Start: 336
• Page End: 338
• Publication Date: 2014-02-01
• Subjects: helical antennas -- microstrip lines -- wireless LAN -- microwave antennas -- impedance matching -- antenna feeds; spiral‐shaped microstrip line -- compact helical antenna -- WLAN application -- space‐limited system -- impedance matching -- spiral‐shaped microstrip line feed structure -- travelling‐wave current -- impedance bandwidth -- frequency 5.2 GHz to 5.8 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2013.4021
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A compact helical antenna with a small ground is proposed for 5.2/5.8 GHz WLAN applications. The proposed antenna can be easily mounted in the space‐limited systems. Good impedance matching is achieved by a spiral‐shaped microstrip line feed structure. Relatively uniform current along the helix is observed owing to the travelling‐wave current on the feed structure, which contributes to high‐gain performance even with a small ground. The measured 3 dB axial ratio bandwidth and impedance bandwidth for S 11 ≤ −10 dB overlap over 5–6 GHz, whereas the realised gain of about 13–14 dBic is achieved over the 5.2/5.8 GHz WLAN band.