Radiation Characteristic Improvement of X-Band Slot Antenna Using New Multiband Frequency-Selective Surface

Elham Moharamzadeh

doi:10.1155/2014/321287

Abstract

A new configuration of frequency-selective surfaces (FSSs) is designed and presented with multiresonance characteristics which covers all of the frequency domain of X-band from 8 to 12 GHz. The proposed FSS comprises three conductor-based split ring resonators, connected together. In this design, two unit cells of the FSS with different lengths are employed side by side to design the FSS. The FSS is used to enhance the gain of the new designed triangle slot antenna at X-band. The proposed FSS is analyzed by using reflected-wave unit-cell box method. The single, double, and array of the FSS cells are studied. Next, the designed FSS along with the antenna is analyzed. The measurement and simulated results of the impedance and radiation characteristics, especially the increment of the gain, are presented.

Highlights

For wireless communications, developments of periodic structures especially frequency-selective surface (FSS) demonstrate their ability in solving some of the key aspects in antenna technology
We showed that by designing two FSS cells with the different resonances side by side a final FSS screen with multiresonances is achieved
We showed that this combination of the FSS screen and the slot antenna can enhance the directive gain of the antenna about 3 dBi

Summary

Introduction

Developments of periodic structures especially frequency-selective surface (FSS) demonstrate their ability in solving some of the key aspects in antenna technology. There have been several techniques to obtain multiple resonance properties, such as a unit cell with geometrically the same shape but different sized elements [11] or with fractal geometry [12]. For this purpose, dual-band FSS in [13] and multiband artificial magnetic conductor (AMC) in [14] have been presented and studied. Afterwards, the gain enhancement of the antenna is studied For this purpose, three split ring resonators are connected together as a unit cell of FSS. All results along with the related discussions are presented in the following

Geometry and Design of Slot Antenna and FSS

GHz 11 GHz

Manufacturing and Measurement

Conclusion