Direct Antenna Binary Phase-Shift Keying through Ferrimagnetic Loading

Shantu Ghose, Department of Electrical and Computer Engineering, Engineering, North Carolina Agricultural and Technical State University

Description

This study proposes the use of Yttrium Iron Garnet (YIG), a ferrimagnetic material, in the form of a small ferrite rod, to load an X band open-ended waveguide antenna. It was observed that the phase of the radiated signal from the YIG-loaded antenna can be tuned by adjusting the magnetic bias field strength. By selectively switching between two magnetic bias fields that give 180-degree phase difference in the radiated signal, a direct antenna binary phase shift keying (DA-BPSK) is realized. Simulation results from HFSS and ADS are used to demonstrate the feasibility of the idea. Such direct antenna modulation (DAM) system can be instrumental for on-chip electrically small antennas.