Research of the l /4 periodically loaded transmission line cavity

In this paper, the transmission character of the periodically capacitor loaded coaxial transmission line is analyzed. We applied this kind of transmission line into the 1/4 wavelength transmission line cavity design. With both the transmission line theory and numerical simulation methods, we obtained the resonating frequency and Q factor as functions of the disk radius and the disk numbers. The possibility of this kind of met hod in decreasing the cavity's volume is discussed and its application in the design of the RF cavity of a proton cyclotron is presented as well in the paper. 