A Novel Triple Band-Notched UWB Printed Monopole Antenna

A novel ultra-wideband (UWB) printed monopole antenna with triple band-notched characteristics is proposed in this paper. The antenna bandwidth is extended by grooving on the connecting floor and increasing the impedance transformation line, with antenna bandwidth of 3.0 similar to 11 GHz and relative bandwidth of 114%. The overall antenna size is 35 x 30 mm(2). The complementary split-ring resonators (CSRRs) are loaded on the UWB antenna patch with microstrip wire feed. A symmetric J gap is loaded on the bottom plate, and the spiral gap is loaded on the feeder. The triple band-notched characteristics at 3.22 similar to 3.97 GHz, 4.94 similar to 5.84 GHz, and 7.25 similar to 7.86 GHz bands are realized. The gain of the designed antenna in the notch frequency segment can be reduced rapidly to -4 dbi, while the gain of other frequency bands is above 2 dBi. Simulated and measured results show that the antenna has stable gain and good radiation characteristics in the UWB frequency range.