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Mode converters are critical for frequency-tunable terahertz gyrotrons. This study reports the development of a broadband TE 02 mode converter centered at 0.2 THz. An octafeed sidewall coupling structure was employed and the mode purity was analyzed. The converter was built using the technique of x-ray microfabrication. The x rays irradiated on the SU-8 resist and generated a template of very high thickness of 1.295 mm. Pulse electroplating technique was used to deposit copper on the structuredoi:10.1063/1.3385685 pmid:20515160 fatcat:76gvz7b2avd65d6th3eax3z3nq