Linear electronic phase shifter design

The rf systems for linear accelerators or storage rings use electronically variable phase shifters as control elements in feedback loops or to set reference phases. A variety of electronic phase shifters has been described in literature. One desirable feature of these devices is a linear response of the phase shift as a function of their control voltage. This report describes the design of 180/degrees/ phase shifters at 1300 MHz and 353 MHz using voltage variable capacitance diodes as terminations in transmission lines. The optimization of paramenters is discussed with emphasis on linearity, power handling capability and temperature stability. 9 refs., 9 figs