A Filtering Antenna Based on Hairpin Ring Resonator

In view of the complex radio interference close to the observation frequency (2.8 GHz) of the solar radio F107 index, this paper proposes a filter antenna, which can effectively improve the selectivity of the antenna and reduce the impact caused by noise entering the observation system. The filter antenna comprises of a hairpin ring resonator (HRR) and a rectangular patch antenna, with two poles in the passband and one broadside radiation null (zero) at the right side of the band edge for improving selectivity. The simulation results indicate that the proposed antenna achieves an impedance bandwidth of 3.2% (2.75-2.84 GHz) at a reflection coefficient |S
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|<-10 dB and has a gain of 3.62 dBi.