High‐gain compact rectangular dielectric resonator antenna using metamaterial as superstrate

Abstract

A compact high‐gain rectangular dielectric resonator antenna (RDRA) using metamaterial (MTM) as superstrate for C‐band applications is proposed in this article. The proposed antenna consists of coaxial‐fed RDRA with 50 unit cells of MTM arranged in 5 × 10 layout as superstrate. Each unit cell is constructed of two parallel eight‐shaped copper strips printed over both faces of a dielectric substrate to provide negative refractive index from 7.3 to 8.1 GHz covering the maximum bandwidth of RDRA. The extracted lumped equivalent circuit model of unit cell of MTM shows concurrence with electromagnetic simulations. The use of MTM superstrate increases the peak gain of the antenna by 89% through simulation and 86% experimentally. The measured results show that the proposed antenna achieves an impedance bandwidth of 16.1% over a band of 7.18‐8.44 GHz, with a peak gain of 14 dBi at 7.8 GHz.

High gain cylindrical dielectric resonator integrated with horn for multiband wireless applications

“…In mushroom‐shaped DRA, mounting of spherical cap lens and metal reflector contributed to gain enhancement. Some other techniques to improve the gain of DRA includes loading with metamaterial (MTM) …”

“…Some other techniques to improve the gain of DRA includes loading with metamaterial (MTM). 19,20 In this article, high gain multiband cylindrical dielectric resonator (CDR) integrated with conical horn antenna is presented. Aluminum-based conical-shaped horn is exploited as the surrounding of the inverted cylindrical DRA to achieve gain enhancement with multiband frequency response.…”

A hybrid dual‐mode dielectric resonator antenna with wide beamwidth

“…One usage of them is selecting the appropriate size of DRAs to excite TE 111 mode and TE 113 to increase the gain of the antennas. [9][10][11][12] Since the two modes have two different resonant frequencies and similar radiation characteristics [13][14][15] , it can also broaden the bandwidth. Another usage of dual modes is in circularly polarized DRAs, which are designed by exciting two orthogonal modes with a 90 phase shift to form a circular-polarized characteristic.…”

Multi-Mode High-Gain Antenna Array Loaded With High Impedance Surface

“…The methods are effective and greatly improve the bandwidth of the microstrip antennas. What"s more, some researchers have improved the gain of the antenna by dielectric resonator antenna [7][8][9]. However, some other challenges such as gain improvement and planar structure are brought.…”