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Open AccessArticle

A Low-Profile High-Gain and Wideband Log-Periodic Meandered Dipole Array Antenna with a Cascaded Multi-Section Artificial Magnetic Conductor Structure

1
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 440-746, Korea
2
Tactical Communication Team, Hanwha Systems, Seongnam 13524, Korea
3
2nd R&D Institute − 1st Directorate, Agency for Defense Development, Daejeon 34186, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4404; https://doi.org/10.3390/s19204404
Received: 31 July 2019 / Revised: 2 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Antenna Technologies for Microwave Sensors)
This paper presents a low-profile log-periodic meandered dipole array (LPMDA) antenna with wideband and high gain characteristics. The antenna consists of 14 dipole elements. For compactness, a meander line structure is applied to each dipole element to reduce its physical length. As a result, a compact and wideband LPMDA antenna is realized, exhibiting a wide impedance bandwidth of 1.04–5.22 GHz (ratio bandwidth of 5.02:1) for | S 11| < −10 dB. To enhance the antenna gain performance while maintaining the wideband behavior, the LPMDA antenna is integrated with a new design of an artificial magnetic conductor (AMC) structure. The designed AMC is realized by combining three AMC structures of different sizes to form a cascaded multi-section AMC structure, of which its overall operating bandwidth can continuously cover the entire impedance bandwidth of the LPMDA antenna. The proposed AMC-backed LPMDA antenna is experimentally verified and its measured −10 dB reflection bandwidth is found to be in the range of 0.84–5.15 GHz (6.13:1). At the main beam direction within the operating frequency bandwidth, the gain of the proposed AMC-backed LPMDA antenna ranges from 7.15–11.43 dBi, which is approximately 4 dBi higher than that of an LPMDA antenna without an AMC. Moreover, the proposed antenna has a low profile of only 0.138 λ L. ( λ L is the free-space wavelength at the lowest operating frequency). View Full-Text
Keywords: artificial magnetic conductor; log-periodic dipole array (LPDA); low-profile; meandered dipole antenna; wideband artificial magnetic conductor; log-periodic dipole array (LPDA); low-profile; meandered dipole antenna; wideband
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Trinh-Van, S.; Kwon, O.H.; Jung, E.; Park, J.; Yu, B.; Kim, K.; Seo, J.; Hwang, K.C. A Low-Profile High-Gain and Wideband Log-Periodic Meandered Dipole Array Antenna with a Cascaded Multi-Section Artificial Magnetic Conductor Structure. Sensors 2019, 19, 4404.

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