A compact CPW‐FED circular patch antenna with pattern and polarization diversities

A compact coplanar waveguide (CPW)‐fed microstrip antenna with pattern and polarization diversities is proposed in this article.By making use of even and odd modes of a CPW feed network, a circular patch antenna operating at TM11 and TM01 modes can be excited, which results in broadside and conical monopole‐like radiation patterns being achieved at an overlapping frequency range for 2.4GHz WLAN applications. The impedance bandwidth (VSWR ≤ 2) are 520 MHz (2.18–2.70 GHz, 21%) and 480 MHz (2.26–2.74 GHz, 20%) for broadside TM11 mode and conical TM01 mode, respectively. The measured isolation is better than 22 dB across the working bandwidth. The measured radiation pattern and gain of the proposed antenna are compared with simulation results.