Single-fed 4G/5G multiband 2.4/5.5/28 GHz antenna

In this study, a single-fed printed multiband antenna for 4G/5G wireless communication systems is presented. The proposed multiband antenna consists of Franklin strip monopole antenna to cover 4G, and wireless applications (WLAN and WiMAX), and a rectangular patch antenna that is designed to cover 5G band. Furthermore, a modified compact microstrip resonant cell low-pass filter is printed between the antenna parts to allow feeding the Franklin antenna at low-frequency bands while isolating the Franklin antenna from the rectangular patch at the 5G band. The proposed antenna is designed on Rogers 5880 with compact size 45 × 40 × 0.508 mm3. The proposed antenna is utilised to operate at triple band: 2.4, 5.5 and 28 GHz with wide impedance bandwidth (15.8, 23.5 and 11.3%) and the gain reaches (1.95, 3.76 and 7.35 dBi).