Tetra-Plexing Dual-Broadband/Dual-Polarized Antenna for 5G/6G Millimeter-Wave Systems

This study introduces a tetra-plexing antenna concept supporting dual-broadband and dual-polarization at 28 and 39 GHz, designed to address prevalent challenges in advanced 5G and 6G communications. Employing a novel tapered multislot load (TMSL) and shorting vias, this antenna design not only enhances bandwidth and cross-polarization discrimination (XPD) but also supports the entire mmWave frequency range from n257 to n261. Each radiator accesses a single element, enabling four independent channel paths within one antenna structure. The innovative use of the segmented loop isolator significantly reduces mutual coupling, allowing for effective tetraplexing. Subsequently, a scalable 1×4 array configuration is introduced, which extends beam steering capabilities up to ±55° at 28 GHz and up to ±38° at 39 GHz, facilitating wide application adaptability. Performance evaluations reveal that simulations show bandwidths of 39.42 % and 19.5 % for 28 GHz and 39 GHz, respectively, while measurements indicate 42.2 % and 28.9 %. XPD improvements are noted above 7 dB and 15 dB at peak levels for 28 GHz and 39 GHz, respectively, with maximum XPD values reaching 23 dB in the LB and 18 dB in the HB. Peak gains are measured at 10.9 dBi and 11.52 dBi in simulations, and 11.27 dBi and 11.8 dBi in measurements for 28 GHz and 39 GHz. By implementing passive branching of signals at the antenna level, the design reduces the load on active circuitry, enhancing overall system performance and positioning the technology as a viable solution for diverse wireless communication applications.