A Penta-band Shared Aperture Antenna with A Very Ratio Frequency for 5G and B5G Smartphone Applications

A penta-band (3.2/5.7/28/38/130 GHz) substrate-integrated waveguide (SIW)shared-aperture based-antenna is proposed. A 2 × 2 compact hook-shaped (0.6×5 mm^2) is proposed for 5.7 GHz band (Port 1 and Port 3). For structure reuse at millimeter wave frequencies, each hook-shaped antenna composed of two orthogonal quarter wavelength-mode SIW slotted cavities (QMSIW). A triple-band 4 × 4 MIMO millimeter-wave (mm-W) antenna is resulted from QMSIW cavities (Port 4, Port 5, Port 6, and Port 7). Their radiations are at 28/38/130 GHz bands. Furthermore, a single T-shaped strip monopole antenna at mid-wad between hook-shaped structures to operate as a 3.2 GHz antenna (Port 2) and to maintain isolation between 5.7 hook-shaped antennas. The simulated results show that the presented antenna achieves excellent penta-band performance with a very high frequency ratio (about 37%), high isolation levels (above 15 dB) at mm-W frequency bands, and above 12 dB isolation level at low bands. Thus, this work represents a promising solution for current and future smartphone trends, especially those seeking to increase their millimeter bands within a compact size.