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Title: MAcro-Electro-Mechanical Systems (MÆMS) based concept for microwave beam steering in reflectarray antennas

Abstract

We present a new approach to perform beam steering in reflecting type apertures such as reflectarray antennas. The proposed technique exploits macro-scale mechanical movements of parts of the structure to achieve two-dimensional microwave beam steering without using any solid-state devices or phase shifters integrated within the aperture of the antenna. The principles of operation of this microwave beam steering technique are demonstrated in an aperture occupied by ground-plane-backed, sub-wavelength capacitive patches with identical dimensions. We demonstrate that by tilting the ground plane underneath the entire patch array layer, a phase shift gradient can be created over the aperture of the reflectarray that determines the direction of the radiated beam. Changing the direction and slope of this phase shift gradient on the aperture allows for performing beam steering in two dimensions using only one control parameter (i.e., tilt vector of the ground plane). A proof-of-concept prototype of the structure operating at X-band is designed, fabricated, and experimentally characterized. Experiments demonstrate that small mechanical movements of the ground plane (in the order of 0.05λ{sub 0}) can be used to steer the beam direction in the ±10° in two dimensions. It is also demonstrated that this beam scanning range can be greatly enhancedmore » to ±30° by applying this concept to the same structure when its ground plane is segmented.« less

Authors:
; ;  [1]
  1. Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
22597692
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 120; Journal Issue: 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTENNAS; APERTURES; BEAMS; CONTROL; DESIGN; LAYERS; MICROWAVE RADIATION; PHASE SHIFT; SOLIDS; TWO-DIMENSIONAL CALCULATIONS; WAVELENGTHS

Citation Formats

Momeni Hasan Abadi, Seyed Mohamad Amin, E-mail: momenihasana@wisc.edu, Booske, John H., E-mail: jhbooske@wisc.edu, and Behdad, Nader, E-mail: behdad@wisc.edu. MAcro-Electro-Mechanical Systems (MÆMS) based concept for microwave beam steering in reflectarray antennas. United States: N. p., 2016. Web. doi:10.1063/1.4960352.
Momeni Hasan Abadi, Seyed Mohamad Amin, E-mail: momenihasana@wisc.edu, Booske, John H., E-mail: jhbooske@wisc.edu, & Behdad, Nader, E-mail: behdad@wisc.edu. MAcro-Electro-Mechanical Systems (MÆMS) based concept for microwave beam steering in reflectarray antennas. United States. doi:10.1063/1.4960352.
Momeni Hasan Abadi, Seyed Mohamad Amin, E-mail: momenihasana@wisc.edu, Booske, John H., E-mail: jhbooske@wisc.edu, and Behdad, Nader, E-mail: behdad@wisc.edu. Sun . "MAcro-Electro-Mechanical Systems (MÆMS) based concept for microwave beam steering in reflectarray antennas". United States. doi:10.1063/1.4960352.
@article{osti_22597692,
title = {MAcro-Electro-Mechanical Systems (MÆMS) based concept for microwave beam steering in reflectarray antennas},
author = {Momeni Hasan Abadi, Seyed Mohamad Amin, E-mail: momenihasana@wisc.edu and Booske, John H., E-mail: jhbooske@wisc.edu and Behdad, Nader, E-mail: behdad@wisc.edu},
abstractNote = {We present a new approach to perform beam steering in reflecting type apertures such as reflectarray antennas. The proposed technique exploits macro-scale mechanical movements of parts of the structure to achieve two-dimensional microwave beam steering without using any solid-state devices or phase shifters integrated within the aperture of the antenna. The principles of operation of this microwave beam steering technique are demonstrated in an aperture occupied by ground-plane-backed, sub-wavelength capacitive patches with identical dimensions. We demonstrate that by tilting the ground plane underneath the entire patch array layer, a phase shift gradient can be created over the aperture of the reflectarray that determines the direction of the radiated beam. Changing the direction and slope of this phase shift gradient on the aperture allows for performing beam steering in two dimensions using only one control parameter (i.e., tilt vector of the ground plane). A proof-of-concept prototype of the structure operating at X-band is designed, fabricated, and experimentally characterized. Experiments demonstrate that small mechanical movements of the ground plane (in the order of 0.05λ{sub 0}) can be used to steer the beam direction in the ±10° in two dimensions. It is also demonstrated that this beam scanning range can be greatly enhanced to ±30° by applying this concept to the same structure when its ground plane is segmented.},
doi = {10.1063/1.4960352},
journal = {Journal of Applied Physics},
number = 5,
volume = 120,
place = {United States},
year = {Sun Aug 07 00:00:00 EDT 2016},
month = {Sun Aug 07 00:00:00 EDT 2016}
}
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