A compact two-element diversity planar antenna for ultra-wideband (UWB) application with band-notch function is proposed. By adapting two symmetrical rectangular patches with three bevels cutting in the edge of the radiators, the antenna provides wideband impedance matching characteristics over the desired frequency range. The wideband isolation can be achieved through uniform branch length ratio used in the ground plane. Measured S-parameters show that the antenna is able to cover the entire UWB band from 3.1–10.6 GHz and good isolation of less than -25 dB. Also it has a band-notch function to avoid overlap with the 3.5 GHz WiMAX band. The radiation pattern, realized gain, envelope correlation, and pulse handling capacity are measured. From the results, it is observed that the proposed diversity antenna can be suitable for UWB application.
Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “A Compact planar diversity antennas for ultra wideband application with band notched function”, Microwave and optical technology letters ( Willey Publication), vol. 55, 2013.