Multi-State UWB Circular Patch Antenna Based on WiMAX and WLAN Notch Filters Operation
In this paper, the authors present a multi-state reconfigurable UWB (Ultra Wide Band) circular patch antenna with two notch filters. The two notch filters can be implemented using U-shaped and J-shaped slots embedded on the patch for WiMAX (Worldwide interoperability for Microwave Access) and WLAN (Wireless Local Area Network) frequency bands rejection. In order to add reconfigurable characteristics to the patch antenna, two copper strips are placed on the slots to represent the ON or OFF switching state of an ideal pin diode. By using this simple switching technique, the current distribution of the patch changes and enables the antenna to have four modes of operation. The achieved results demonstrate that the antenna can function over the entire UWB working frequency range (3.1GHz to 10.6GHz) in one of the switching configurations.