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A Stripline-Based Planar Wideband Feed for High-Gain Antennas with Partially Reflecting Superstructure
Affan A Baba1, Raheel M Hashimi2, Mohsen Asadnia3
1School of Engineering, Macquarie University, Sydney, New South Wales 2109, Australia. affan.baba@mq.edu.au.
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.
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