Two-cavity klystron uses single-cavity tuning

Two techniques have been generally used to construct a tunable, two-cavity klystron. The first involves the use of a movable plunger in each cacity, while the second employs a single diaphram to tune both cavities. Problems concerning the use of these techniques are related to variations in the output power with tuning. The present investigation is concerned with a klystron which is designed to be tuned only at the output cavity. This approach eliminates the problems inherent in the two earlier designs. The discussed klystron was designed for a CW output of about 200 W at X band. The resonant frequency of the structure without perturbation is 10 GHz, and the tuning range is 100 MHz.