Ferrite-Loaded Magnetically Reconfigurable SIW Magnetic Dipole Antenna With Tunable Frequencies

A novel ferrite-loaded magnetically reconfigurable substrate-integrated waveguide (SIW) magnetic dipole antenna with frequency tunability is proposed. The antenna has an SIW construction with a three-sided short circuit and a one-sided open circuit, with the ferrite material inserted into the substrate. The frequency reconfiguration is accomplished by altering the bias magnetic field. The simulation results reveal that the tunable frequency range is more than 5.2% (from 5.26 GHz to 5.54 GHz) for the lower bias magnetic field and 7.1% (from 4.64 GHz to 4.98 GHz) for the higher bias magnetic field. In the frequency tuning range, the antenna boasts a radiation efficiency of over 70%, a gain of over 1.6 dBi, and a stable radiation pattern. The proposed antenna is fabricated and measured. It represents an excellent reconfigurable scheme for 5G applications.