Miniaturization of Dielectric Resonator Antenna by Using Artificial Magnetic Conductor Surface

Shahid Khan,Mohsen Khalily,Camel Tanougast,Jalil Ur Rehman Kazim,Haider Ali,Syed Usman Ali Shah,Hazrat Ali

doi:10.1109/access.2020.2986048

Abstract

In this work, a dielectric resonator antenna (DRA) is miniaturized by using Artificial Magnetic conductor (AMC) surface without disturbing other important parameters. The design has three main features: (i) simple micro-strip line feeding, (ii) use of parasitic metallic strip to achieve impedance matching, and (iii) use of AMC surface for design miniaturization. The miniaturization is performed for dielectric resonator antenna at 3.5 GHz. Without changing the basic characteristic of the antenna such as gain, resonance frequency and efficiency, the size of the antenna was reduced by 85%. The AMC surface and DRA both are positioned on the FR4 substrate. The AMC surface consists of small patches of copper. DRA is mounted on the AMC surface, which significantly reduces the overall DRA volume. Nine AMC patches were introduced with a small gap between them. AMC patches were shorted with the ground metal with the help of small metallic vias. For an overall performance analysis, the design was fabricated, and measured results were taken. The fabricated design covers a bandwidth of 180 MHz for −10 dB reference value of the reflection coefficient, which is mainly used for 5G wireless application. The design has 14.2% impedance bandwidth. Based on the analysis made for the proposed design, it is found that this simple technique highly reduces the DR volume (85%) and ground surface (15.5%) while maintaining the overall performance of the square DRA.

Highlights

For different wireless communication systems, the dielectric resonator antenna (DRA) volume is the major challenge
It is observed that when the number of unit cells on Artificial Magnetic conductor (AMC) surface is 2 × 2, the antenna resonates at 3.2 GHz with bandwidth of 120 MHz, which is not the desired frequency
In this work, miniaturization of Dielectric Resonator Antenna with the help of AMC unit cell is presented. This technique was only applied to microstrip Patch Antennas

Summary

INTRODUCTION

For different wireless communication systems, the DRA volume is the major challenge. Provision of multiple and flexible features by communication systems must be accompanied by an adjustable DR front end. In [6], the size of the DR is not reduced but only bandwidth is enhanced, and the overall complexity of the design is increased Another technique is sticking perfect electric conductor to the walls of the DR [7], [8]. The size of the DR and ground surface was miniaturized by 85% and 15.5% respectively while preserving the overall performances such as gain, efficiencies, bandwidth and resonance frequency. The proposed design is significant in many ways It has simple feeding technique with a better value of impedance matching, stable radiation pattern and more than 85% miniaturization is attained with a high value of gain. Rest of the paper is organized as follows: Section II presents the proposed design analysis, Section III presents parametric analysis, Section IV gives details of simulated and measured results and Section V concludes the paper

PROPOSED DESIGN ANALYSIS

PARAMETRIC STUDY

SIMULATED AND MEASURED RESULTS DISCUSSION

Findings

CONCLUSION