Broadband Double-Layered Coplanar Patch Antennas for Microwave / Millimeter-Wave Wireless Communications

Abstract

In this paper, we have presented the double-layered coplanar patch antennas of enhanced impedance bandwidth and adjustable conductor-backed coplanar waveguide feed lines. The proposed structure retains the advantage of laying the coplanar patch and CPW feed line on the same surface, which makes direct integration with other devices easier. Besides the substrate thickness of the radiating patch can be adjusted for wider impedance bandwidth while the dimensions of the CPW feed line was kept unchanged. Simulation has been done by using commercial EM simulation software. A parametric study of the gap distance between the coplanar patch and the top ground, and the width at the feeding point was carried out. Four testing antennas, which operate at 10GHz, were designed and the characteristics of the antennas were compared. The four testing antennas had same total thickness, but different thickness combinations. The measured return loss, gain, and radiation patterns of the antennas demonstrated that different thickness combinations do not affect the characteristics of the antennas seriously. Therefore, the dimensions of the CPW feed lines of the antennas can be adjusted for different applications.