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In this paper, we report the design methods and numerical results for a novel and compact circular waveguide TM02-TE11 mode converter, which has a high pure TE11 mode output. The converter has been designed to transform the high order TM02 circular waveguide output mode from relativistic backward-wave oscillators into the fundamental TE11 circular waveguide mode. The results show that the purity of...
To overcome the limitation in bandwidth and power capacity of Traveling-Wave in Ceramic (TWC) coaxial window, a wide-band high-power coaxial window is proposed. Using CST Microwave Studio, a L-band wide-band high-power coaxial window is optimized and the performance is compared with half-wavelength coaxial window and TWC coaxial window, which shows wider bandwidth and higher power capacity of the...
A novel type of strong-coupling five-gap extended output cavity is investigated for the W-band SBEIK to verify its resonant advantages of mode separation, gap fields coupling and RF energy exporting etc. And the degeneracy mode competition for the strong-coupling five-gap cavity is studied due to its axial period structures. The result shows that the frequency interval between the work mode and vicinal...
Uni-traveling-carrier photodiodes with novel dual-drifting-layer structure is proposed to realize wide bandwidth and high saturation power performance. High-speed operation at high bias voltage is demonstrated by optimizing the electric field profile within the dual-drifting-layer structure.
Depletion region of uni-traveling-carrier photodiodes (UTC-PDs) is optimized. Wide bandwidth of 28.5 GHz and high saturation photocurrent of 38 mA at 20 GHz are achieved for a 14-µm diameter device.
This talk will describe modified uni-traveling carrier photodiodes (MUTCs) that have achieved high RF output power and high saturation current. Discrete photodiodes, 4×1 phase matched arrays, and balanced detectors will be discussed.
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