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Generation of Millimeter-wave Orbital Angular Momentum States using Microstrip Line Fed Cylindrical Dielectric Resonator Antenna

A novel cylindrical dielectric resonator antenna (DRA) fed by microstrip line rather than probe coupling or aperture coupling is proposed in this paper. The two ports of microstrip directional coupler can excite two degenerate HEM21δ modes of cylindrical DRA. And two orbital angular momentum (OAM) states, l = +1 and l = -1, can be obtained when the angle of two output terminals of coupler is 135°. The simulation of proposed design operating in millimeter wave (35 GHz) was on the basis of full-wave simulation software to test the correctness of proposed novel excitation. The S-parameters and phase distribution of proposed DRA using microstrip line fed are simulated and studied. In addition, its radiation patterns and realized antenna gain of two ports are given and discussed.