Four-port printed MIMO Dipole Antennas at Wi-Fi 6E/7 Bands for Wireless Modem Applications

A design of four-port MIMO (multiple-input multiple-output) dipole antennas at Wi-Fi 6E/7 bands (2.4-2.484 GHz, 5.15 – 7.125 GHz) for wireless modem applications is proposed. The printed dipole is printed on an FR4 substrate with a dielectric constant of 4.4, a thickness of 1.6 mm and a loss tangent of 0.0245. Positioned around the base plate, four printed dipole antennas are employed. The dipole antenna consists of a two-arm dipole and a parasitic C-shaped strip. The dipole is excited by a mini-cable. The two-arm dipole antenna is responsible for exciting Wi-Fi 6E/7 bands and enhancing low-frequency matching by using a parasitic C-shaped strip around the two-arm dipole. The dipole antenna with a reflector improves antenna gain and directivity. The distance between the dipole antenna and the reflector is 15.625mm. The overall dimensions of the design are 123.2 mm x 81.6 mm x 71.6 mm. From the measured results, The S parameters within the frequency bands are all lower than -10dB, and the measured isolation parameters are all lower than -15dB. The simulated gain falls within the range of 3.6 – 4dBi for low frequencies and 4.1 – 6.4dBi for high frequencies. The design exhibits good performances is good for wireless modem applications at the Wi-Fi 6E/7 bands.