A CPS leaky-wave antenna with reduced beam squinting using NRI-TL metamaterials

Antoniades, M. A. and Eleftheriades, G. V. (2008) A CPS leaky-wave antenna with reduced beam squinting using NRI-TL metamaterials. IEEE Transactions on Antennas and Propogation, 56 3: 708-721.


Author Antoniades, M. A.
Eleftheriades, G. V.
Title A CPS leaky-wave antenna with reduced beam squinting using NRI-TL metamaterials
Journal name IEEE Transactions on Antennas and Propogation  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2008-03
Sub-type Article
DOI 10.1109/TAP.2008.916965
Volume number 56
Issue number 3
ISSN 0018-926X
Start page 708
End page 721
Total pages 14
Place of publication Piscataway, NJ, United States
Publisher I E E E
Language eng
Formatted abstract A reduced beam-squinting printed leaky-wave antenna (LWA) is proposed, comprising cascaded negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. Each NRI-TL unit cell is implemented in co-planar strip (CPS) technology and consists of a host TL loaded with series interdigitated capacitors and shunt meandered inductors. Periodic analysis is applied to the NRI-TL unit cell in order to extract the dispersion and Bloch impedance characteristics. Subsequently, the angular variation of the main radiated beam with frequency or "beam squinting"is derived, based on the expression for the Bloch propagation constant of the NRI-TL line. It is shown that by operating the LWA in the upper right-handed band where the phase and group velocities are closest to the speed of light, the beam squinting that the antenna experiences can be minimized. The theoretical performance of the LWA is verified through full-wave simulations and measurements of a fabricated prototype designed to produce a radiated beam at an angle of θsc = +45° at fo = 5 GHz. This 20-element NRI-TL LWA exhibits a measured return-loss bandwidth below -10 dB of 0.91 GHz (18.2%), and an average beam squint of 0.031°/ MHz. The proposed NRI-TL LWA is uniplanar, differential and broadband, and therefore suitable for integration with other microwave components and devices.
Keyword Beam Squinting
Co-planar strip
Leaky-wave antennas (LWAs)
Metamaterials
Negative refractive index (NRI)
Periodic structures
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article
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