Design of Self-Duplexed Hybrid Substrate Integrated Waveguide Antenna for Sub-6 and Mm-Wave Application

The following paper will study the quarter mode and full mode SIW antennas operating at 3.5 GHz for the sub-6 GHz frequency band and 30.5 GHz for the 30 GHz millimeter-wave band. To satisfy the full-size form factor, a new Quarter Mode (QM) is employed for the sub-6 GHz frequency, and a Full Mode (FM) with a millimetre-wave frequency that uses a rectangular slot cavity-backed design is used. The suggested antenna is built on an RT Duroid 5880 substrate, with dimensions of 18.8 × 18.8 × 1.54 mm at 3.5 GHz frequency and 5.16 × 5.16 mm × 1.54 mm at 30.5 GHz frequency, to offer spatial diversity and improve isolation between the two modes. The antenna radiates in a unidirectional manner and has gains between 4.3 and 7.15 dB.