Skip navigation
Logo
User training | Reference and search service

Library catalog

Retrievo
EDS
b-on
More
resources
Content aggregators
Please use this identifier to cite or link to this item:

acessibilidade

http://hdl.handle.net/10071/16648
acessibilidade
Title: Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays
Authors: Cruz, C. C.
Fernandes, C. A.
Matos, S. A.
Costa, J. R.
Keywords: Geometrical optics (GO)
Millimeter-wave antennas
Planar lens antennas
Radiation pattern shaping
Secant squared power pattern
Transmit arrays
Issue Date: 2018
Publisher: IEEE - Institute of electrical electronics and engineers
Abstract: Transmit arrays have been mostly used for beam collimation applications, either with fixed or scanning beam capability. But transmit arrays can also be used to synthesize power radiation patterns complying with power pattern templates. A new analytical formulation is presented here to obtain a phase-only correction function corresponding to a given power template. The transmit-array transforms the known power radiation pattern of the primary source into a desired output power pattern. The proposed formulation, specialized for axial-symmetric structures, is based on geometrical optics and provides the solution directly from the evaluation of two closed-form first-order differential equations. As a proof of concept, a sec 2 with a roll-off at 45° is defined as the target power pattern, at the 30 GHz Ka-band. A 10.8 dBi radiation pattern with the circular polarization is used to illuminate a 180 mm ×180 mm transmit array with 60 mm focal distance. Previously designed 3.35 mm thick phase-delay unit cells are used as an example to implement the calculated phase distribution over the transmit-array aperture. The measured antenna radiation pattern matches quite well the template, with a steep fall of the radiation at the roll-off angle and low cross-polarization. This validates the concept, the formulation, and the fabricated prototype.
Peer reviewed: yes
URI: http://hdl.handle.net/10071/16648
DOI: 10.1109/TAP.2018.2836383
ISSN: 0018-926X
Ciência-IUL: https://ciencia.iscte-iul.pt/id/ci-pub-49164
Accession number: WOS:000440848900021
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

Files in This Item:
acessibilidade
File Description SizeFormat 
FINAL_VERSION.pdfPós-print942.68 kBAdobe PDFView/Open


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Currículo DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.