CPW-Fed Monopole Antenna for Multiple System Integration

In this work, a coplanar-waveguide (CPW)-fed monopole antenna for multiple wireless communication system integration is developed. A rectangular monopole antenna and a feeding structure are fabricated on the same plane of the substrate to simplify circuit processing and position alignment. Simply tuning one of the CPW ground-plane widths, which results in an asymmetrical ground plane structure, enhances the impedance bandwidth and excites the circular polarization at 1.57 GHz. To cover the operation bandwidth of the wireless local area network (WLAN) system, a parasitic inverted-L radiating strip is shorted to the ground plane. The measured impedance bandwidth of a S₁₁ <; -10 dB ranges from 1.37 to 2.82 GHz, and thus covers most commercial wireless communication systems, such as GPS, DCS, PCS, IMT-2000, WLAN, and LTE. The measured 3-dB axial-ratio bandwidth is about 3.8% with respect to 1.56 GHz.