2.6 GHz Planar Dipole Antenna over High Impedance Surface

Abstract

High impedance surface has found promising application as antenna ground plane. This paper presents the analysis of a 2.6 GHz low profile folded dipole over High Impedance Surface. The antenna can operate over the frequency range(2.5GHz-2.7GHz) in the MMDS band. The unit cell of HIS, Folded dipole and its feed network has been modeled and optimized using FDTD tool. Feed network comprises of BALUN providing interconnection between coplanar and twin line. 8% impedance bandwidth is obtained. AMC characteristics of HIS made possible low profile configuration of antenna effectively replacing the role of PEC as ground plane. Reduction in antenna size together with improvement in gain, directivity has been achieved using new ground plane. The structure has been fabricated and measured results show good agreement with the simulated results.