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- Title
Design of a Dual-Mode Input Structure for K/Ka-Band Gyrotron TWT.
- Authors
Ma, Mengshi; Zhao, Qixiang; Mo, Kunshan; Zheng, Shuquan; Peng, Lin; Lv, You; Feng, Jinjun
- Abstract
A dual-band gyrotron traveling wave amplifier (Gyro-TWT) can reduce the size, cost, and weight of a transmitter in dual-band radar and communication systems. In this paper, a dual-mode input coupler for K/Ka dual-band gyrotron traveling wave amplifier (Gyro-TWT) is designed. This structure is composed of two different types of input couplers, one is the coaxial input coupler for the Ka-band TE 2 , 1 Gyro-TWT and the other is a Y-type input coupler for the K-band TE 1 , 1 Gyro-TWT. For reducing the backward wave of the TE 2 , 1 mode reflecting into the Y-type input coupler to influence the operating bandwidth, a Bragg reflector with a strong mode selective characteristic is inserted between these two couplers, which can make the reflection coefficient of the TE 2 , 1 mode better than −1 dB and the phase matched in the whole bandwidth, and the transmission coefficient of the TE 1 , 1 mode can reach better than −1 dB. Based on the simulation results, the −1 dB bandwidth of the Ka-band TE 1 , 0 ⬜ - TE 2 , 1 ◯ mode input coupler reaches 3.32 GHz and the −1 dB bandwidth of K-band TE 1 , 0 ⬜ - TE 1 , 1 ◯ mode input coupler reaches 3.15 GHz. The designed dual-mode input coupler has the advantages of broad bandwidth and low loss and can be well used in dual-band Gyro-TWTs.
- Subjects
GYROTRONS; RADAR transmitters; TELECOMMUNICATION systems; REFLECTANCE; BANDWIDTHS
- Publication
Electronics (2079-9292), 2022, Vol 11, Issue 3, p432
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics11030432