paper 150120094234

Abstract

A movement of a microwave magnetic field near a dipole, which is excited by a plane electromagnetic wave, is investigated theoretically. The total microwave magnetic field H ~ being a superposition of fields of incident and scattered waves is under consideration. A varactor- loaded dipole is simulated by equivalent oscillator. It has been shown that projections of the field H~ of electromagnetic wave near the dipole satisfy the canonical ellipse equation (in the general case). This ellipse’ orientation and magnitudes of half-axles depend on electric parameters of the equivalent oscillator as well on the dipole length and distance from it The total magnetic ~ rotates in one direction at frequencies above the frequency ω0 of the dipole resonance field H ~ (DR) and in the counter direction below ω0 . Viz, left-handed H-field takes place at frequencies ~ ω > ω0 while right-handed H-field corresponds to ω < ω0 . When the dipole break is loaded with a varactor one can change the capacity C of the equivalent oscillator by application of bias voltage to the varactor. It results in tuning the DR. Electrically tunable DR can switch sense of rotating of the magnetic field. This effect in aggregate with the phenomenon of ferromagnetic resonance (FMR) in ferrite can provide electrically controlled nonreciprocity of transmission of microwaves. It can be useful in information technologies (IT) for development of fast-switched nonreciprocal devices.

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Yuri N. Kazantsev

Valery S. Butylkin

Galina A. Kraftmakher