Millimeter-wave TE01–TE11–HE11 mode converter using overmoded circular waveguide

Amit Patel, Riddhi Goswami, Alpesh Vala, Keyur Mahant, Hiren Mewada, Pujita Bhatt, K. Sathyanarayan and S. V. Kulkarni

Journal of Electromagnetic Waves and Applications, 2018, vol. 32, issue 14, 1768-1778

Abstract: The paper presents overmoded circular waveguide mode converters (TE01 into HE11 with TE11 as an intermediate mode) used in a 42 ± 0.2 GHz, 200 kW gyrotron transmission line system for plasma heating in electron cyclotron resonance heating application. To convert mode from TE01 to TE11, we have used wriggle converter method with a deformation in the converter axis and for TE11 to HE11 mode converter the depth of corrugation decreases gradually from λ2 $ \frac{\lambda }{2} $ to λ4 $ \frac{\lambda }{4} $ . Both the converters are optimized in terms of design parameters using mode field matching technique. The TE01 to TE11 mode converter showed a conversion efficiency of 95% (predicted 99%) for a length of 1205 mm, while TE11 to HE11 mode converter gave conversion efficiency of 99% (predicted 99.98%) for a diameter of 32 mm. Cross-polarization isolation of 31.7 dB is obtained in TE11 to HE11 mode converter. Convergence of the theoretical values and the simulated results indicates that the converters meet the system requirements.

Date: 2018
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DOI: 10.1080/09205071.2018.1468286

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