Exciting Circular TM<sub>11</sub> Mode Using Symmetric Probes Based on Ridge Gap Waveguide

Wang, Minxing; Wu, Zewei; Liao, Xiaoyi; Yuan, Haojun; Pu, Youlei; Wang, Jianxun; Luo, Yong

doi:10.1109/tmtt.2021.3121324

Cited by 1 publication

(2 citation statements)

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“…The electric dipole moment ( P ) and magnetic dipole moment ( M ) are proportional to the normal electric field ( E 1 n ) and tangential magnetic field ( H 1 u,v ) of the incident wave, respectively. The mode of the incident wave in the main waveguide is represented by subscript 1, and the mode excited in the secondary waveguide is represented by subscript 2 [ 28 , 30 , 32 , 33 , 34 ].

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Section: Overmoded Te 01 Excitationmentioning

confidence: 99%

“…The circular TE 01 mode is achieved via the rectangular TE 20, and, with a similar topology, the circular TE 13 mode is achieved via the rectangular TE 50 mode [ 29 ]. Some other mode conversion methodologies for the gyro-TWT have also been reported, such as circular TM 01 mode excitation based on a ridge gap waveguide [ 30 ], and HE 11 hybrid mode excitation based on scattering matrix formalism for high-power radar applications [ 31 ]. The performance comparison of some proposed mode converters for gyro-TWT is listed in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

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Design and Measurement of a Novel Overmoded TE01 Mode Converter for a Rectangular Gyro-TWT

Jiang

et al. 2022

Micromachines

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The rectangular gyrotron traveling wave tube (gyro-TWT) with a large aspect ratio (α) has the potential to achieve megawatt-class output power. As an essential component of gyro-TWT, a novel overmoded Ka-band mode converter with an α of 6.19 is designed, analyzed, and cold tested in this paper. Based on the magnetic dipole moment theory, the rectangular overmoded TE01 mode is excited via the rectangular fundamental TE10 mode. The cutoff waveguide is applied to prevent electromagnetic wave transport to the magnetron injection gun (MIG) region and also guarantee higher power electron beam transportation. Simulations predict an operation bandwidth higher than 4 GHz and greater than 99.8% mode purity between 33–37 GHz. To verify this design, the mode converter is manufactured and cold tested. The back-to-back measurement results exhibit a good agreement with the simulation. With similar topologies, the rectangular overmoded TE01 mode can be excited in a different α.

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