A compact microstrip-fed slot antenna with a dual-band notched function for WiMAX Operation

The WiMAX is an emerging wireless communication technology which can provide high speed connectivity for the internet. In terms of transmission distance, data transmission speed, and the construction cost of network are good broadband wireless access solution. This network technology is without having the traditional PSTN (Public Switched Telephone Network) and cable. But it can provide consumers used wireless technology to connecting the internet and to transmit or receive the required information in the city or suburb. In addition, WiMAX is a backhaul of WLAN, when the products have WiMAX technology, users can use the WLAN connectivity within the hotspot. In recent years, many studies of the CPW- fed printed slot antennas [1–2, 6], and microstrip-line fed printed slot antennas [3–5] have been proposed. In particular printed wide-slot antennas are adopted because its characteristic is conductive to enhance the bandwidth. The antenna proposed in [1] is a CPW-fed square slot antenna, which uses a widened tuning stub to enhance the bandwidth, but its size is large and the bandwidth is not wide enough to support most wireless applications. In [3], the designed antenna uses a rectangular slot with a triangular slot on the bottom to achieve broadband. In [4–6], these proposed antennas used different shapes strips and inserting the slot, the strips can reject the frequency bands of unwanted.