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In this work, The mechanical movements of a piezoelectric actuator is used to change the capacitance values of an air-gap capacitor. With a bias voltage up to 200 V the effective air gap size, Seff, increases continuously from 5 mum to 10.5 mum. Due to that the coupling capacitance is tuned from 0.22 pF to 0.1 pF, i.e. tuning ratio of 2.2. When employing in hybrid packaged tunable voltage-controlled...
In this work; a simple and efficient tuning method of a microstrip shunt-resonator is presented. A gap coupling capacitance can be tuned by utilizing PZT cantilever which is used to raise one of the gap-electrodes metallization patterns. When employing in shunt microstrip resonator, its resonant frequency tuned from 40.08 GHz to 41.25 GHz with high loaded quality factor. The whole size of the device...
Tunable voltage controlled oscillators (VCO's) are expected to be useful in enhancing the multi-band pro- grammability of wired/wireless communication terminals. A voltage tunable oscillator employing barium strontium titanate (BST) tunable capacitor is presented. The utilized BST tunable capacitor shows a tuning of 20% at 35 GHz. The oscillation frequency of the voltage controlled oscillator (VCO)...
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