Journal ArticleDOI
Improved Cross-Polarization Performance of a Multi-Phase-Center Parabolic Reflector Antenna
Z. A. Pour,Lotfollah Shafai +1 more
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TLDR
In this article, the cross-polarization properties of multi-phase-center parabolic reflector antennas, illuminated by over-moded primary feeds, have been investigated and a simple array technique with a simple signal processing is used for the symmetric case, whereas a trimode primary feed is employed for the offset case.Abstract:
This letter addresses the cross-polarization properties of electronically controlled multi-phase-center parabolic reflector antennas, illuminated by over-moded primary feeds. Due to the presence of the higher-order modes in the primary feed, the secondary cross-polarization levels deteriorate in the case of symmetric reflector antennas. As for the offset reflectors, the primary multimode feed required to displace the phase-center location may produce a significant crosstalk in the orthogonal polarization. It is shown how one can improve the cross-polarization performances of aforementioned adaptive antennas, which are capable of providing axial beams while their phase-center locations are displaced. The conventional array technique with a simple signal processing is used for the symmetric case, whereas a trimode primary feed is employed for the offset case.read more
Citations
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Journal ArticleDOI
Reconfigurable meta-mirror for wavefronts control: applications to microwave antennas.
TL;DR: Frequency agility, beam deflection and beam focusing are the main functionalities demonstrated from the proposed reconfigurable meta-mirror for wavefronts control in microwave antenna applications.
Journal ArticleDOI
In-Plane Feed Antennas Based on Phase Gradient Metasurface
TL;DR: In this article, the authors proposed an in-plane feed antenna (IPFA) based on phase gradient metasurface (PGM), which can couple normally incident waves efficiently into surface waves along the surface.
Journal ArticleDOI
Sidelobe Reductions in Linear Array Antennas Using Electronically Displaced Phase Center Antenna Technique
Tanzeela Mitha,Maria Pour +1 more
TL;DR: In this paper , a novel approach to sidelobe reduction in uniformly excited, equally-spaced linear arrays using the electronically displaced phase center antenna (E-DPCA) technique is presented for the first time.
Journal ArticleDOI
H-Plane Cross-Polarization Reduction of a Rectangular Patch Antenna Using SISL Technology
TL;DR: In this paper, a simple rectangular patch antenna with reduced H-plane cross polarization using substrate integrated suspended line (SISL) technology is proposed, where the nonradiating edges of the traditional patch are extended to the electric walls of the SISL to reduce the orthogonal E-fields of the non-radiating edge.
Proceedings ArticleDOI
In-plane focus reflector antennas based on phase gradient metasurface
TL;DR: In this article, the authors proposed an in-plane focus reflector antennas (IFRA) based on phase gradient metasurface (PGM), which can couple normally incident waves efficiently into surface waves along the surface.
References
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Book
Introduction to Radar Systems
TL;DR: This chapter discusses Radar Equation, MTI and Pulse Doppler Radar, and Information from Radar Signals, as well as Radar Antenna, Radar Transmitters and Radar Receiver.
Book
Microwave antenna theory and design
TL;DR: This book discusses microwave antenna design problems, circuit relations, reciprocity theorems, and antenna measurements - techniques.
Journal ArticleDOI
New class of primary-feed antennas for use with offset parabolic-reflector antennas
A.W. Rudge,N.A. Adatia +1 more
TL;DR: In this paper, the authors describe a new class of primary-feed antennas which overcome the offset reflectors' depolarising and beam-squinting properties, which offer a significant improvement in the cross-polar and beamsquinted properties of the primary reflector antenna, without adding significantly to the complexity or mass.
Displaced-Phase-Center Antenna Technique
TL;DR: The acronym MTI is used in a generic sense, in reference to any technique that Displaced-Phase-Center Antenna Technique, or DPCA, improves the performance of moving-target-indicator (MTI) radars mounted on moving platforms.
Journal ArticleDOI
A Simplified Feed Model for Investigating the Cross Polarization Reduction in Circular- and Elliptical-Rim Offset Reflector Antennas
Z. A. Pour,Lotfollah Shafai +1 more
TL;DR: In this article, an analytic model for the primary feed of offset reflector antennas is presented that facilitates a more general investigation of the cross polarization reduction in both asymmetric and inter-cardinal planes.
Related Papers (5)
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