A Single-Feed Wideband Circularly Polarized Dielectric Resonator Antenna Using Hybrid Technique With a Thin Metasurface

A compact metasurface-based circularly polarized (CP) dielectric resonator antenna (DRA) is proposed with wideband characteristics. The antenna forms a very simple structure, composed of a rectangular DR, a single coaxial probe, and plus-shaped unit cells-based metasurface. The metasurface is realized on a grounded FR-4 substrate. Next, a rectangular DR is loaded centrally over the metasurface. The DR is fed with a perturbed probe feed at an appropriate angle of ( θ =29°), along the diagonal line. Thus, a novel hybrid technique involving the angle of feed location from the center of DR, and the N × N unit cells-based metasurface is utilized for generating a wideband CP radiation. The resonance from the rectangular DR and surface waves along the 7× 7 plus-shaped unit cells-based metasurface is exploited to achieve a wide 3-dB axial ratio (AR) and impedance matching bandwidth. The fabricated antenna prototype used for the validation of predicted results confirms the successful implementation of the proposed technique. Measured results demonstrate a wide impedance bandwidth of 32% (3.6 GHz - 7.0 GHz) and an overlapping 3-dB AR bandwidth of 20.4% (4.2 GHz - 5.2 GHz). Moreover, the antenna adopts a left-hand circular polarization (LHCP) with 6-7 dBic measured gain within the operational frequency range. Overall, the proposed antenna offers low-profile, simplicity, ease of design, and high performance

Analysis and Design of a Compact Leaky-Wave Antenna for Wide-Band Broadside Radiation

A low-cost compact planar leaky-wave antenna (LWA) is proposed offering directive broadside radiation over a significantly wide bandwidth. The design is based on an annular metallic strip grating (MSG) configuration, placed on top of a dual-layer grounded dielectric substrate. This defines a new two-layer parallel-plate open waveguide, whose operational principles are accurately investigated. To assist in our antenna design, a method-of-moments dispersion analysis has been developed to characterize the relevant TM and TE modes of the perturbed guiding structure. By proper selection of the MSG for a fabricated prototype and its supporting dielectric layers as well as the practical TM antenna feed embedded in the bottom ground plane, far-field pencil-beam patterns are observed at broadside and over a wide frequency range, i.e., from 21.9 GHz to 23.9 GHz, defining a radiating percentage bandwidth of more than 8.5%. This can be explained by a dominantly excited TM mode, with low dispersion, employed to generate a two-sided far-field beam pattern which combines to produce a single beam at broadside over frequency. Some applications of this planar antenna include radar and satellite communications at microwave and millimeter-wave frequencies as well as future 5G communication devices and wireless power transmission systems

High-Gain Aperture-Coupled Dielectric-Resonator with Surface Mounted-Horn

1 page(s

Gain enhancement of a dielectric resonator antenna with use of surface mounted short horn

We demonstrate the gain of a standard rectangular dielectric resonator antenna (DRA) enhanced by integrating it with a surface mounted short horn (SMSH). An enhancement of gain by 3.8 dB to 8,3 dBi at 5.95 GHz, and a 10 dB return bandwidth of 3.2% has been achieved from this configuration. Total height of the fabricated structure is only 0.172 λ0, or 8.61 mm at 6.0 GHz, and the aperture size is 0.96 λ0 x 0.86 λ0, or 48.1 mm x 43.1 mm. The cross-polarization level of the antenna is <33 dB in both E- and H-planes.5 page(s

Substrate integrated metamaterial-based leaky-wave antenna with improved boresight radiation bandwidth

10.1109/TAP.2013.2256094IEEE Transactions on Antennas and Propagation6173451-3457IETP

Resonance Frequency of an Equilateral Triangular Microstrip Antenna with or without Air Gap

5 page(s

A wideband circularly polarized stacked slotted microstrip patch antenna

10.1109/MAP.2013.6781708IEEE Antennas and Propagation Magazine55684-99IAPM

Analysis and circuit model of a multilayer semiconductor slow-wave microstrip line

9 page(s

Investigation on High Gain Compact Circularly Polarized Microstrip Antenna

5 page(s