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Reconfigurable Folded Reflectarray Antenna Based Upon Liquid Crystal Technology

Bildik, S. and Dieter, S. and Fritzsch, C. and Menzel, W. and Jakoby, R. :
Reconfigurable Folded Reflectarray Antenna Based Upon Liquid Crystal Technology.
In: Antennas and Propagation, IEEE Transactions on, 63 (1) pp. 122-132. ISSN 0018-926X
[Article] , (2015)

Abstract

A reconfigurable antenna based on the liquid crystal technology is presented in this paper. The antenna comprises a planar lower reflector with an incorporated feed at its center and a polarizing grid on top as an upper reflector. The lower reflector is utilized to collimate the beam and to twist the polarization. The polarizing grid selects the polarization for the transmission and reflects the orthogonally polarized waves toward the lower reflector. Combining reflector elements with a polarizing grid allows performing additional phase adjustment on the upper reflector for beam steering. Reconfigurability is maintained by the upper reflector, in which a liquid crystal mixture is used as a tunable substrate. The liquid crystal layer is tuned with a bias voltage configuration to obtain an appropriate phase adjustment for the beam steering. As a proof of concept, the beam steering capability of the antenna is demonstrated by steering the main beam to -6°, 0 °, and 6 ° at 78 GHz. The measured gain at 78 GHz is 25.1 dB. The proposed antenna configuration is a promising candidate for reconfigurable, high-gain, low-profile, and low-cost antennas.

Item Type: Article
Erschienen: 2015
Creators: Bildik, S. and Dieter, S. and Fritzsch, C. and Menzel, W. and Jakoby, R.
Title: Reconfigurable Folded Reflectarray Antenna Based Upon Liquid Crystal Technology
Language: English
Abstract:

A reconfigurable antenna based on the liquid crystal technology is presented in this paper. The antenna comprises a planar lower reflector with an incorporated feed at its center and a polarizing grid on top as an upper reflector. The lower reflector is utilized to collimate the beam and to twist the polarization. The polarizing grid selects the polarization for the transmission and reflects the orthogonally polarized waves toward the lower reflector. Combining reflector elements with a polarizing grid allows performing additional phase adjustment on the upper reflector for beam steering. Reconfigurability is maintained by the upper reflector, in which a liquid crystal mixture is used as a tunable substrate. The liquid crystal layer is tuned with a bias voltage configuration to obtain an appropriate phase adjustment for the beam steering. As a proof of concept, the beam steering capability of the antenna is demonstrated by steering the main beam to -6°, 0 °, and 6 ° at 78 GHz. The measured gain at 78 GHz is 25.1 dB. The proposed antenna configuration is a promising candidate for reconfigurable, high-gain, low-profile, and low-cost antennas.

Journal or Publication Title: Antennas and Propagation, IEEE Transactions on
Volume: 63
Number: 1
Uncontrolled Keywords: liquid crystals;millimetre wave antenna arrays;reflectarray antennas;beam steering capability;bias voltage configuration;frequency 78 GHz;gain 25.1 dB;liquid crystal technology;phase adjustment;planar lower reflector;polarizing grid;reconfigurable folded reflectarray antenna;tunable substrate;Antenna feeds;Beam steering;Liquid crystals;Microstrip antenna arrays;Substrates;Beam steering;liquid crystals;microstrip antenna arrays;microwave antennas;millimeter wave technology;reflectarrays
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Microwave Engineering
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics
Date Deposited: 16 Apr 2015 13:41
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