A PLANAR CPW-FED PATCH ANTENNA ON THIN SUBSTRATE FOR BROADBAND OPERATION OF ISM-BAND APPLICATIONS

摘要

This article presents the design and fabrication of three ISM-bands coplanar waveguide (CPW)-fed patch antenna on a thin substrate for applications within 2.400-2.484, 5.150-5.350, and 5.725- 5.825 GHz bandwidths. The prototype consists of a thin substrate and a CPW-fed patch. To obtain sufficient bandwidth with -10 dB return loss, a thin substrate layer is inserted under the ground plate and the radiator. A thin substrate CPW-fed patch that has three ISM-bands is used. Important design parameters are the radiator's construction, width, length, the substrate height, and the CPW-fed gaps. From these optimized parameters, a CPW-fed patch antenna is fabricated and measured. The measured results of the fabricated antenna are obtained from operating bands at 4.23-GHz bandwidths with a -10 dB return loss referenced to the center frequency, and the peak gain at 3.82 dBi. The experimental radiation efficiency in both the E-plane and H-plane is shown to be a pass band total of 50-82%. It is capable of covering three ISM bands at 2.400-2.484 and 5.150-5.350/5.725-5.825 GHz, which is ideally suitable for short-range wireless applications.