Abstract
The design of H -band (220–325 GHz) high-order overmoded power couplers for sheet electron beam (SEB) devices is presented in this article. The proposed power coupler was mainly based on the coupling apertures and possessed the functions of both the mode conversion and the beam wave convergence/separation. To compensate for the junction discontinuity and, thus, reduce the port reflection, triangular septa and matching steps were introduced. A rectangular Bragg reflector was used in the SEB tunnel to further improve the performance of the coupler. Two identical rectangular TE20-mode couplers joined back-to-back were fabricated by the nano-computer numerical control (CNC) machining, and the S-parameters were measured by using a vector network analyzer. The measured S-parameters agreed well with the simulated ones that are achieved from the coupler model with measured dimensions when considering the ohmic loss. A 3-dB transmission bandwidth of $\sim 56.3$ GHz (222.2–278.5 GHz) was measured with a maximum transmission coefficient of −4.4 dB and a port reflection of $\sim \!\!-15.0$ dB.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Microwave Theory and Techniques
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
