Design of Monopole UWB Antenna Using Complementary Split-Ring Resonator Loading with Triple Band-Notched Function *

th , 2012; revised: Sep. 27 th , 2012; accepted Oct. 10 th , 2012 Abstract: This paper puts forward a new kind of monopole UWB (Ultra wideband) antenna based on the CSRR (Complementary Split-Ring Resonator) with triple band-notched characteristics. Antenna is fed by a 50 Ω microstrip line. With a CSRR structure on the monopole patch unit, dual-band filtering properties in the WiMAX (3.3 - 3.6 GHz) and C-band (3.7 - 4.2 GHz) for satellite communication systems are achieved. Using a symmetrical CSRR structure loading on the ground, WLAN (5.15 - 5.825 GHz) band-notched characteristics is obtained. Changing the parameters of the CSRR structure, the effects of S11 parameters, voltage standing wave ratio (VSWR) and radiation characteristics are analyzed. The designed antenna has an impedance bandwidth of 2.7-8.5 GHz for VSWR less than 2.