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A Stripline-Based Planar Wideband Feed for High-Gain Antennas with Partially Reflecting Superstructure

1
School of Engineering, Macquarie University, Sydney, New South Wales 2109, Australia
2
Department of Electronics and Telecommunication, Politecnico di Torino, 10129 Turin, Italy
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(5), 308; https://doi.org/10.3390/mi10050308
Received: 12 April 2019 / Revised: 30 April 2019 / Accepted: 5 May 2019 / Published: 7 May 2019
(This article belongs to the Special Issue Nanodevices for Microwave and Millimeter Wave Applications)
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Abstract

This paper presents a new planar feeding structure for wideband resonant-cavity antennas (RCAs). The feeding structure consists of two stacked dielectric slabs with an air-gap in between. A U-shaped slot, etched in the top metal-cladding over the upper dielectric slab, is fed by a planar stripline printed on the back side of the dielectric slab. The lower dielectric slab backed by a ground plane, is used to reduce back radiation. To validate the wideband performance of the new structure, in an RCA configuration, it was integrated with a wideband all-dielectric single-layer partially reflecting superstructure (PRS) with a transverse permittivity gradient (TPG). The single-layer RCA fed by the U-slot feeding structure demonstrated a peak directivity of 18.5 dBi with a 3 dB directivity bandwidth of 32%. An RCA prototype was fabricated and experimental results are presented. View Full-Text
Keywords: high-gain; compact; wideband; resonant cavity; Fabry–Perot cavity; cavity resonator; EBG resonator high-gain; compact; wideband; resonant cavity; Fabry–Perot cavity; cavity resonator; EBG resonator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Baba, A.A.; Hashmi, R.M.; Asadnia, M.; Matekovits, L.; Esselle, K.P. A Stripline-Based Planar Wideband Feed for High-Gain Antennas with Partially Reflecting Superstructure. Micromachines 2019, 10, 308.

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