1 December 1990 Design of a single-period 8.6 Ghz TM01-TE11 serpentine mode converter and TM01 and TE11 bends in a moderately overmoded circular waveguide
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Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15143Q (1990) https://doi.org/10.1117/12.2301544
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States
Abstract
Certain high-power microwave tubes currently under development have their output in the TM01 mode in a circular waveguide. This mode has a transverse electric field in the waveguide which is completely radial and produces an open-end radiation pattern which is entirely in the θ (the polar angle) direction with a null on the waveguide axis. This radiation pattern is not optimum for most applications and it is often desirable to convert the TM01 mode into the TE11 mode which has its maximum on the waveguide axis, is approximately linearly polarized, and has a higher maximum directivity than the TM01 mode. In this paper, we discuss a TM01 - TE11 serpentine mode converter for a high-power backward wave oscillator operating at 8.6 GHz. Morgan’s method was used to derive the coupling coefficients and numerical computation to optimize the conversion efficiency. Test results are presented. Waveguide bends for TM01 and TE11 modes in an overmoded waveguide are also discussed.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. H. Luo, "Design of a single-period 8.6 Ghz TM01-TE11 serpentine mode converter and TM01 and TE11 bends in a moderately overmoded circular waveguide", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15143Q (1 December 1990); doi: 10.1117/12.2301544; https://doi.org/10.1117/12.2301544
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