A triple-band planar monopole antenna for GPS/LTE/WLAN/Wi-Fi/WiMAX systems

A novel triple-band planar monopole antenna is presented in this report. By combing a C-shaped monopole, a U-shaped loop and a modified ground with a slot, three operating bands can be achieved. The measured results show that the 10-dB impedance bandwidths of the proposed antenna can cover multiple frequency bands, including 1.55-1.67 GHz, 2.2-3 GHz and 5.13-6 GHz, which can be applied to the GPS, LTE, WLAN, Wi-Fi and WiMAX systems. A prototype of the proposed antenna is fabricated and measured, the experimental results agree well with the simulated results.

I. Introduction

With the rapid proliferation of various wireless communication standards, the demand for a single wireless platform with multi-band applications is increasing. The monopole antennas have enjoyed proliferated use in many multi-band applications due to their compact size, easy integration and low cost. Consequently, various multi-band monopole antennas receive increasing interest from both industries and academia. For example, a planar dual-band monopole antenna for WiMAX applications is presented in [1]. A compact tri-band antenna with rectangular ring is proposed in [2], which covers the frequency bands 2.34-2.74GHz, 3.04-3.82 GHz, and 5.03-6.05 GHz. A tri-band microstrip-fed slot antenna for WLAN/WiMAX applications is proposed in [3]. A compact coplanar waveguide (CPW) fed ultra-wideband (UWB) printed monopole antenna (PMA) with triple band-notched characteristics is presented in [4]. However, some of them only have dual-band characteristics, and some cannot operate at GPS and LTE/WLAN/WiMAX bands at same time or their big sizes are not suitable for some certain applications.