A Wide-Angle Scanning Leaky-Wave Antenna Based on a Composite Right/Left-Handed Transmission Line

This paper presents a frequency-independent, wide-angle scanning leaky-wave antenna (LWA), based on the composite right/left-handed transmission line (CRLH TL). The proposed LWA consists of a coplanar waveguide-grounded (CPWG) structure loaded by varactors. Loaded varactors are used to control the p...

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Bibliographic Details
Published in:Applied sciences 2020-03, Vol.10 (6), p.1927
Main Authors: Xie, Shaoyi, Li, Jiawei, Deng, Guangjian, Feng, Jiaxin, Xiao, Shaoqiu
Format: Article
Language:English
Subjects:
Antennas
composite right/left-handed transmission line (crlh tl)
coplanar waveguide ground (cpwg)
Coplanar waveguides
Design
frequency-independent
Handedness
Leaky waves
leaky-wave antenna (lwa)
Radar systems
Radiation
Scanning
Simulation
Transmission lines
Varactor diodes
wide-angle scanning
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Summary:This paper presents a frequency-independent, wide-angle scanning leaky-wave antenna (LWA), based on the composite right/left-handed transmission line (CRLH TL). The proposed LWA consists of a coplanar waveguide-grounded (CPWG) structure loaded by varactors. Loaded varactors are used to control the phase constant of the fundamental mode of the LWA by adjusting the applied DC voltage. The LWA has an excellent wide-angle scanning capability, a simple structure, and low cost. Results show that the main beam of an LWA with 20unit cells can scan from −66° to 62° at the operation frequency of3.0 GHz, with a peak gain of 9.9 dBi, and a gain fluctuation of less than 4.9 dB. The operation bandwidth and radiation efficiency are about 13% and over 50%, respectively. A 10-unit cascaded LWA prototype was designed, fabricated, and measured to verify the design concept.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10061927