Theoretical Design and Simulation of a Dual-Band Sheet Beam Extended Interaction Oscillator

Millimeter-wave devices have great application value and development prospects in military radar, satellite communication, and other fields. Extended interaction devices (EIDs) are widely used in various fields because of their small size, light weight, large bandwidth, and high output power, which are of great significance to the research of millimeter-wave sources. This article presents the design of a sheet beam, dual-beam, dual-cavity coupled extended interaction oscillator (EIO) that can operate separately at 94 GHz and 140 GHz. The coupling coefficient, characteristic impedance, and other parameters were analyzed to optimize the cavity structure and improve transmission performance. The results of the 3D particle-in-cell (PIC) simulation demonstrated that the designed EIO reached a peak output power of 6.3 kW and 41 kW, respectively, when driven by sheet electron beams of 3 A, 34 kV and 3 A, 56 kV.