Integrated large-frequency-ratio dual-band tapered slot with monopole antenna for 4G/5G/B5G

With the advanced communications systems, the integration of 5G bands, including sub-6-GHz and millimeter-wave (mm-wave) bands with the existing lower bands of 3G/4G has become an essential need for the future mobile handsets. This article proposes an integration between a large-frequency-ratio dual-band tapered slot antenna with a multisection meander monopole antenna on a handset board. The tapered slot Vivaldi antenna (TSVA) functions as a resonant open-ended slot at low frequencies (sub-6 GHz) while also acting as a high-gain Vivaldi antenna at higher frequencies (mm-wave 28 GHz). The modification of the slot geometry, that is, generating multisections within the slot, is shown to improve the impedance bandwidth. Furthermore, the meander-line monopole antenna covers the bands of the existing mobile generation (3G/4G) at 0.8, 1.8, 2.1, and 2.3 GHz. Most importantly, the compact size of the proposed antenna is realized by utilizing the side wall of a mobile board.