A novel triple band-notched UWB printed monopole antenna

Abstract

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 3.0~11 GHz and relative bandwidth of 114%. The overall antenna size is 35 × 30mm2. 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 3.22~3.97 GHz, 4.94~5.84 GHz, and 7.25~7.86 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.