Abstract
A novel method of electrical frequency tuning for a dielectric resonator oscillator is presented. The idea is to place an opened λ/4 line, with a varactor diode at one end, onto the screw for frequency tuning which is above the dielectric resonator. The central frequency offset achieved with the DRO realised at 14 GHz was 4 MHz, while the change of RF power was less than 0.5 dBm.
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