Super wideband with band rejection characteristics circular patch monopole antenna for 5G and beyond

Abstract

A super wideband monopole antenna design for microwave and advanced wireless applications in
the frequency range of 2.2 GHz to 27.06 GHz. At first, a circular resonator with a ring dimension
is used to achieve a wideband range of frequency with a band rejection characteristic in the lower
band. Where the antenna provides broadband from 2.2 GHz to 27.06 GHz with four notch bands
covering 12.26- 14.44 GHz, 17.39–19.60 GHz, 2.69–4.36 GHz, and 5.5–7.14 GHz. These notch band
frequencies are productively used to evacuate undesired interference of different wireless frequencies.
Additionally, six symmetrical tiny circle stubs are introduced in the ground plane to improve the overall
characteristic without notch bands. The combination of the ring patch with the line feed broadens
the stable radiation, super bandwidth, and stable gain characteristics. The overall electric size of the
antenna is 0.41 × 0.35 × 1.52
3
0
where the maximum gain is 6.4 dBi in between the higher frequency
band and 4 dBi from 2.6-5.7 GHz. The proposed antenna exhibits a novel structure and achieves a wide
bandwidth without using any external electronics components. The overall fractional bandwidth is
more than 166% and excellent performance enters the wireless frequency band. The proposed structure
was designed and fabricated to be experimentally validated and could be applied in various wireless
components and applications.