Stub-loaded Dual-Band Planar Antenna for 28/38 GHz 5G Applications

A stub-loaded dual-band patch antenna design is presented for millimeter-wave 5G applications. Two techniques are integrated to design the antenna: first, an inset-fed rectangular patch is designed and then open-circuit stubs of quarter-wavelength are integrated with the feed line. The inset-fed patch has a frequency band of 38 GHz, whereas the stubs are designed to have a frequency band of 28 GHz. For reduced back radiations, a modified ground plane is utilized. This modification tends to enhanced antenna gain and efficiency, which are noted to be 5.5 dBi and 88%, respectively. For the validation of the proposed design, a prototype is fabricated and tested, and a reasonable agreement is observed between both the simulated and measured results.