Multi-Functional Ultra-Wideband Monopole Antenna with High Frequency Selectivity

摘要

A multi-functional microstrip-fed ultra-wideband (UWB) monopole antenna has been presented. By loading two dual-mode resonators and shunt metallic strips on the reference UWB antenna, two additional operational states are created, including band-notched UWB response (i.e., 3.1 similar to 11.5 GHz passband response except the notched band of 5.15 similar to 5.8 GHz) and narrow bandpass response (5.5-5.95 GHz) with high frequency selectivity. Moreover, the frequency characteristics of bandpass filtering antenna is also studied when we solder two lumped-chip 0 Omega resistors instead of the shunt metallic strips. Four antenna prototypes are designed, fabricated and measured to validate the design concept. Full-wave electromagnetic simulator HFSS is used for the antenna design optimization and performance prediction. The measured results are presented including return losses, gains and radiation patterns, declaring that the proposed antennas have good impedance matching performance and radiation patterns.