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.
Highlights
Common approaches to achieve high antenna directivity include the use of antenna arrays, which require a complex feeding network, or reflector antennas, which are bulky in nature
With the increase in bandwidth, the input matching becomes increasingly challenging. This effect is more pronounced when the peak gain of the Resonant-Cavity Antennas (RCAs) ranges between 15–20 dBi, which is required in most medium-range applications
A planar, wideband feed antenna is proposed, which can be used for feeding wideband RCAs
Summary
Common approaches to achieve high antenna directivity include the use of antenna arrays, which require a complex feeding network, or reflector antennas, which are bulky in nature. An RCA is formed by placing a partially reflecting superstructure (PRS) in front of a primary source antenna (such as a slot, or dipole), above a metallic ground plane or Artificial Magnetic Conductor (AMC) [5]. With the increase in bandwidth, the input matching becomes increasingly challenging This effect is more pronounced when the peak gain of the RCAs ranges between 15–20 dBi, which is required in most medium-range applications. Standard waveguide adaptors are quite expensive, and mechanically bulky They present a reasonable feeding method for antenna testing and characterization, their use adds significant cost, weight, and volume in most practical RCAs. In this paper, a planar, wideband feed antenna is proposed, which can be used for feeding wideband RCAs. In this paper, a planar, wideband feed antenna is proposed, which can be used for feeding wideband RCAs It can be fabricated through the standard-printed-circuit board (PCB) manufacturing process, and can be interfaced with any type of wideband PRS, to form a stand-alone RCA. A prototype was fabricated and measured to validate the performance
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