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Open AccessFeature PaperArticle

High-Isolation Leaky-Wave Array Antenna Based on CRLH-Metamaterial Implemented on SIW with ±30o Frequency Beam-Scanning Capability at Millimetre-Waves

1
Electronic Engineering Department, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy
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Center for Communications Technology, School of Computing & Digital Media, London Metropolitan University, London N7 8DB, UK
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School of Engineering & the Built Environment, Edinburgh Napier University, 10 Colinton Rd.; Edinburgh, EH10 5DT, UK
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School of Engineering, University of Bolton, Deane Road, Bolton BL3 5AB, UK
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Faculty of Engineering & Informatics, University of Bradford, Bradford, West Yorkshire BD7 1DP, UK
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Electrical and Electronic Engineering Department, Public University of Navarre, 31006 Pamplona, Spain
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(6), 642; https://doi.org/10.3390/electronics8060642
Received: 22 April 2019 / Revised: 30 May 2019 / Accepted: 5 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Massive MIMO Systems)
The paper presents a feasibility study on the design of a new metamaterial leaky-wave antenna (MTM-LWA) used in the construction of a 1 × 2 array which is implemented using substrate-integrated waveguide (SIW) technology for millimetre-wave beamforming applications. The proposed 1 × 2 array antenna consists of two LWAs with metamaterial unit-cells etched on the top surface of the SIW. The metamaterial unit-cell, which is an E-shaped transverse slot, causes leakage loss and interrupts current flow over SIW to enhance the array’s performance. The dimensions of the LWA are 40 × 10 × 0.75 mm3. Mutual-coupling between the array elements is suppressed by incorporating a metamaterial shield (MTM-shield) between the two antennas in the array. The LWA operates over a frequency range of 55–65 GHz, which is corresponding to 16.66% fractional bandwidth. The array is shown to exhibit beam-scanning of ±30° over its operating frequency range. Radiation gain in the backward (−30°), broadside (0°), and forward (+30°) directions are 8.5 dBi, 10.1 dBi, and 9.5 dBi, respectively. The decoupling slab is shown to have minimal effect on the array’s performance in terms of impedance bandwidth and radiation specifications. The MTM-shield is shown to suppress the mutual coupling by ~25 dB and to improve the radiation gain and efficiency by ~1 dBi and ~13% on average, respectively. View Full-Text
Keywords: Metamaterials (MTM); leaky-wave antenna (LWA); antenna arrays; substrate integrated waveguide (SIW); transverse slots; beam-scanning; mutual coupling isolation; millimetre-wave; composite right/left-handed transmission line (CRLH-TL) Metamaterials (MTM); leaky-wave antenna (LWA); antenna arrays; substrate integrated waveguide (SIW); transverse slots; beam-scanning; mutual coupling isolation; millimetre-wave; composite right/left-handed transmission line (CRLH-TL)
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MDPI and ACS Style

Alibakhshikenari, M.; Virdee, B.S.; See, C.H.; Abd-Alhameed, R.A.; Falcone, F.; Limiti, E. High-Isolation Leaky-Wave Array Antenna Based on CRLH-Metamaterial Implemented on SIW with ±30o Frequency Beam-Scanning Capability at Millimetre-Waves. Electronics 2019, 8, 642.

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