An Integrated Filtering Antenna with Bandpass Filters For 5G Applications

This paper objective is to propose a novel filtering monopole antenna design aimed towards wide-band applications. The antenna features three distinct ports. By integrating two nested resonator and hairpin filter designs directly with the antenna, a compact form factor is achieved. The antenna is resonating at 4.03 GHz frequency, the rectangular nested resonator structure is resonating at 4.35 GHz frequency and the hairpin resonator structure is resonating at 4.85 GHz frequency. Overall, the filtering antenna is resonating at 4.36 GHz frequency with a working frequency band of 3.32-4.54 GHz, providing a constant gain of 2.3 dB in the working band. Proposed structure gives 31.0% 10 dB fractional bandwidth along with two radiation nulls of -11.95 dB and -6.73 dB at 2.84 GHz and 6.16 GHz respectively. It can be used for applications in sub-6 GHz 5G frequency band or other systems implementing wideband applications.