Design of an ultratkin microstrip antenna for WLAN and Bluetooth applications

Abstract

In this paper, an ultrathin, lightweight, high-efficiency antenna on a flexible substrate is presented. A polyimide substrate with a thickness of only 0.0762 mm is used. A reduced ground plane is preferred to achieve higher efficiency and omnidirectional radiation pattern. The −10dB bandwidth of the proposed antenna covers complete ISM band of 2.4–2.5 GHz. The designed antenna has a return loss of −50dB, an efficiency of 98.5% and a gain of 1.95 dBi at the center frequency. The designed antenna deliberates excellent performance and is a suitable candidate for WLAN and Bluetooth applications.