A planar CPW‐fed patch antenna on thin substrate for broadband operation of ISM‐band applications

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. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2199–2202, 2012; View this article online at wileyonlinelibrary.com.). DOI 10.1002/mop.26994