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High order mode oscillation in a terahertz photonic-band-gap multibeam reflex klystron
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Image of FIG. 1.
FIG. 1.

Schematic of (a) the reflex klystron, showing the reflexing electrons and the accelerating and the repeller voltages and , respectively, and (b) the hybrid PBG cavity resonator, formed when the top metal plate is moved, in the direction of the arrows, to touch the combination of the PC structure and the adjacent metal cavity, and an array of nine electron beams passing through the cavity.

Image of FIG. 2.
FIG. 2.

Electric field (V/m) contours for the mode at the location of the electron beams of the device in (a) conventional metal and (b) hybrid PBG cavities.

Image of FIG. 3.
FIG. 3.

Simulated output power and frequency vs repeller voltage characteristics with its FFT display of the multibeam reflex klystron, excited in the mode, in (a) conventional metal and (b) hybrid PBG cavities, taking the beam cycle number as .

Image of FIG. 4.
FIG. 4.

Field contours at beam locations and the corresponding FFT display for the device (a) in a conventional metal cavity compared with that (b) in a hybrid PBG cavity, taking the beam cycle number as at the optimum .


Generic image for table
Table I.

Normalized maximum cavity potential at the center of -beam of array of nine electron beams, with respect to that of -beam at the middle of the array, -beam standing for the intersection of the row with the column of the array; . The peak electric fields of each cavity are for hybrid PBG cavity and for conventional cavity.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High order mode oscillation in a terahertz photonic-band-gap multibeam reflex klystron