Abstract
Tunable Ka band filters based on graded barium strontium titanate (BST) have been investigated in terms of their associated parasitics, tunability, and temperature dependence of capacitance. The simulation results show that increase in parasitic resistance from 0.05 ohm to 1 ohm increases the insertion loss from 0 db to 25 db. The simulation results also show that, with 60% tunability for graded BST capacitors, the center frequency of the filter can be tuned from 29.489 GHz to 45.144 GHz. In addition, the bandwidth shift becomes temperature independent when the graded BST capacitor is biased at an electric field of 3e7V/cm.
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