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A unique hook-shaped conformal metal strip has been used to excite a cylindrical multilayer dielectric resonator antenna (DRA). By using the proposed unique feed and multi dielectric layers, a broadband circular polarization have been achieved over a bandwidth of ∼9.8% in conjunction with an impedance-matching bandwidth of ∼12.8% at same frequency range. The DRA has been successfully designed and...
This study presents design and analysis of a wideband circularly polarized (CP) cylindrical hollow shaped dielectric resonator antenna (DRA) which has been excited with a roman three (m) shaped feed. The proposed feed has been made-up of five metallic strips, which have been optimized to generate a wideband circular polarization. The proposed antenna offers circular polarization over a bandwidth of...
The Microstrip reflectarray has been identified as one of the enabling technologies to achieve low mass, conformal mounting, wide-angle beam scanning, etc. [1] for NASA's future spaceborne high-gain antennas. It combines some of the best features of microstrip array antenna technology and the traditional parabolic reflector. Recently, the reflectarray antenna has found another horizon. It has the...
This paper presents the design of gap-coupled series fed antenna array with improved bandwidth. The series-fed array is designed using ‘U’ shaped microstrip feed lines and parasitic elements gap-coupled to non-radiating edges of the central elements. The fabricated 3 element gap-coupled series-fed array has VSWR <2 bandwidth of 5.5%, achieving 3 times improvement in bandwidth as compared to conventional...
As an alternative of parabolic reflectors, microstrip reflectarrays inherit their many merits as well as those of conventional antenna arrays. This work is focused on solving the problem of terahertz (THz) beam scanning by reflectarrays. The proposed reflectarray is demonstrated based on novel single-layered elements with a linear phase delay and multi-frequency phase-matching method. An operating...
Multioctave Planar Phased Arrays (MPPA) have advanced rapidly since 2000. Today, MPPA technology and its market needs appear to be nearing a point of convergence. This paper reviews the history of thin MPPAs, which exclude the Vivaldi antenna type, and presents modern planar Traveling-Wave Antenna (TWA) array as a thin MPPA. The differentiating features of modern planar TWA array from other thin MPPAs,...
In this paper, a novel planar printed monopole antenna for ultrawideband (UWB) applications is presented. The proposed antenna is based on a compact-size 25×20×1.6-mm3 FR4-epoxy substrate and has a diamond-like patch. Slots with the shape of a 45°-rotated 2nd-iterated Sierpinski-carpet are incorporated in the patch. The antenna is mictrostrip-line fed and has a partial ground plane flushed with the...
This paper presents a compact low-cost microstrip antenna for ultra-wideband (UWB) operation. The antenna is printed on a 30 mm times 20 mm times 1.6 mm FR4-epoxy substrate and has a dual-modified-Sierpinski-carpet-shaped patch above a partial ground plane. A matching section connects the patch to an I-shaped feed line. The antenna is designed and simulated using both the Finite-Element Method and...
In this paper rectangular dielectric resonator antennas (RDRAs) which providing circular polarization (CP) using single probe feeds are studied. A new technique for CP achievement is presented. This technique proposed that by modifying the RDRAs in suitable way, the fundamental mode of conventional rectangular DRA splits into two near-degenerate orthogonal resonant modes and CP is obtained. The proposed...
The Microstrip reflectarray has been identified as one of the enabling technologies to achieve low mass, conformal mounting, wide-angle beam scanning, etc. [1] for NASA's future spaceborne high-gain antennas. It combines some of the best features of microstrip array antenna technology and the traditional parabolic reflector. Recently, the reflectarray antenna has found another horizon. It has the...
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