Frequency control method for microwave oscillators using straightedge MSW resonators

In this paper we discuss the effects of additional electrodes, fabricated near the center electrode of a magnetostatic wave (MSW) straightedge resonator, on the frequency shifts of the magnetostatic wave oscillator. Upon switching the p-i-n diodes on and off in the additional electrode circuits, the resonant frequency can be shifted without changing the external magnetic field and the circuit parameters of a feedback load circuit. We constructed oscillators using this technique and could observe shifts of oscillatory peaks as predicted by our equivalent circuit model. Some interesting features of the frequency shifts are also discussed.