A 0.35 THz Extended Interaction Oscillator based on Overmoded and Bi-Periodic Structure

Xu, Che and Meng, Lin and Paoloni, Claudio and Qin, Yu and Bin, Lianjie and Wang, Bin and Li, Hailong and Yin, Yong (2021) A 0.35 THz Extended Interaction Oscillator based on Overmoded and Bi-Periodic Structure. IEEE Transactions on Electron Devices, 68 (11). pp. 5814-5819. ISSN 0018-9383

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Abstract

An improved topology of Extended interaction oscillators (EIO) is presented with enhanced efficiency at 0.35 THz. A bi-periodic ladder-type structure is used for optimizing the performance of the TM 31−2π mode operation, based on bi-periodic interaction gaps composed of staggered short and long slots. The bi-periodic interaction mechanism permits to operate the circuit with a standing-wave field between the π and 2π modes, thus providing the potential to combine the advantages of both π and 2π modes in terms of both coupling and output performance. The resulting transverse TM 31 operating mechanism exhibits a good agreement with the bi-periodic structure in terms of coupling performance, with the short slot length positively correlated with the value of effective characteristic impedance M2R/Q . The circuit demonstrates attractive coupling and output characteristics by optimization of M2R/Q and Qe . A state-of-the-art value M2R/Q of 59.69 Ω and a moderate Qe of 2523.52 are achieved for a proposed eight-period ladder-type EIO. An RF power of 540 W is obtained with a 42.5 kV, 0.6 A sheet beam, with 2.1% electronic efficiency at 0.35 THz.