MODELING, SIMULATION, OPTIMIZATION AND EXPERIMENTAL VERIFICATION OF THE PERFORMANCE OF KA-BAND RESONANT CAP IMPATT OSCILLATOR

Three dimensional modeling, simulation and optimization of a Ka-band resonant cap IMPATT oscillator has been carried out by using High Frequency Structure Simulator (HFSS) software. This model has been optimized to obtain a high quality factor at an eigen frequency of 36 GHz by varying cap radius, cap height and sliding short position. It is observed that a cap radius of 2.1 mm, a cap height of 1.46 mm and sliding short position at 0 mm and 4.5 mm leads to the desired optimization. Experiment has been carried out to study the high frequency performance of Ka-band resonant cap IMPATT oscillator with various cap diameter, cap height and sliding short position. It is observed that maximum output power at around the eigen frequency of 36 GHz is obtained when the cap diameter ranges from 3.8 – 4.2 mm and corresponding cap height ranges from 1.4 – 1.8 mm with sliding short position at 0 mm and 5.0 mm. The experimental results are in good agreement with simulation results.