A Filtering Antenna And Its Sub-Array Based On The Self-Shielded Coupling Feeding Structure

This paper proposes a three-dimensional stacked integrated filtering antenna, which is composed of four SIW cavities stacked vertically, and a rectangular slot is etched on the top of the last cavity to form a slot antenna. The antenna uses a self-shielded coupling feeding structure which can control the coupling more flexibly and make the antenna has a strong antijam ability. The filtering antenna was designed and simulated to be operated at 26 GHz with a bandwidth from 25.5 GHz to 26.5 GHz. It obtains an average gain of 4.5 dB, whereas a cross-polarization level maintains lower than 20 dB across the entire operating band. It also has a compact size 5.9 mm×4.6 mm×3.8 mm. Through a ball grid array, the antenna can be formed into a sub-array as a surface mounted component, so it can be applied to a 5G mm-Wave system.