Polarization-Insensitive Holographic Surfaces With Broadside Radiation

Scalar holographic surfaces (HSs) with a unique polarization-insensitive property are presented. The proposed HSs are constructed by sinusoidally modulated loop-wire unit cells, which can support both TE mode and TM mode propagation with the same phase velocity. The modulation principle in terms of...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2016-12, Vol.64 (12), p.5272-5280
Main Authors: Mei Li, Shao-Qiu Xiao, Sievenpiper, Daniel F.
Format: Article
Language:English
Subjects:
Antennas
Dipoles
Hexagonal lattice
Holographic surfaces (HSs)
Holography
Impedance
Lattice vibration
leaky-wave antennas
metasurfaces
modulated surfaces
Modulation
Phase velocity
Polarization
Propagation modes
Refractive index
Refractivity
Surface impedance
Surface treatment
Surface waves
Wire
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Summary:Scalar holographic surfaces (HSs) with a unique polarization-insensitive property are presented. The proposed HSs are constructed by sinusoidally modulated loop-wire unit cells, which can support both TE mode and TM mode propagation with the same phase velocity. The modulation principle in terms of refractive index is presented, which is convenient for HS designs concerning both TE and TM modes. A scalar polarization-sensitive HS using square patches exhibits a mismatch in the E- and H-plane beamwidths due to the sin (φ) circumferential illumination of the x-directed dipole, resulting in a low aperture efficiency. Two novel scalar HS designs using loop-wire configuration in square lattice and hexagonal lattice are proposed which exhibit the polarization-insensitive property with nearly circularly symmetric E- and H-plane beamwidths when illuminated by an x-directed dipole. Both simulations and measurements are carried out in this paper, which agree well with each other.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2016.2618853