| Compact high-power millimeter-wave devices are able to employ in airborne,space borne and the high power level is irreplaceable by other devices.As a result,the demand for compact high power and high efficiency millimeter wave devices is increasing.Sheet beam extended interaction oscillator(SBEIO)has excellent performance in millimeter-wave applications and becomes an important high-power radiation in the millimeter band.A nine interaction gap with enhanced efficiency ladder structure is designed in Ka band.The content includes resonate simulation,particle in cell simulation and cold test of the cavity.By the uniform Ez modulating,the 34 k V,3.5 A electron beam with 8 mm×0.6 mm cross section can produce 21.6 kW with efficiency 18.1%.Enhanced longitudinal electric field distribution is proposed,which can improve power to 28.1 kW with enhanced efficiency 23.6%.The phase re-matching technique is further used to improve interaction efficiency.The mode competition occurred in the optimization process is suppressed by optimization.Finally,the resonate can produce high power 36 kW with efficiency increasing to 30%.The model of Ka-band SBEIO ladder structure is manufactured and cold test of the structure is done,the simulation and cold test get good accordance.A ladder structure with 15 gaps is designed in W-band.The chapter contains eigenmode simulation,particle in cell simulation and cold test experiment.A sheet beam with 15:1 aspect ratio is employed.By input 44.4 kV,2A direct current the 6 mm×0.4mm sheet beam can produce 6.7 kW power with efficiency 7.5%.The W-band design of the ladder structure is manufactured and the cold test experiment is down.Hot test is done which electron transmission rate is 99%.When the voltage is 48 kV and current is 1.8A,output power 2.1 kW in 95.09 GHz can be obtained.In this paper,the method of improving the interaction efficiency in ladder structure is studied.This design serves a reliable and compact high power RF radiation for aerospace. |
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