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Microwave pulse compression has applications in radar technology and plasma diagnostics. The pulse compressor requires a dispersion curve with a monotonic group velocity and low losses in a reasonable wide frequency band. It can be achieved by the helically corrugated waveguide (HCW) [1–3] with both axial and azimuthal periodicity that couples modes in the circular waveguide to generate new operating...
A quasi-optical corrugated horn has been constructed for a W band gyro-TWA1,2 based on a cusp electron beam source3–5 with a helically corrugated interaction region6–8. The design is intended to provide an effective method to decouple the radiation and the beam so that a depressed collector energy recovery system may be used9–11. The horn converts a cylindrical TE11 mode into a free-space TEM00 mode...
Gyro-BWOs are efficient sources with wide frequency tuneability and high power capability from the microwave to terahertz frequency range. The helically corrugated waveguide couples two modes in the circular waveguide to generate a new operating eigen-mode which has large group velocity in low axial wavenumber range [1]. Gyro-BWOs based on helically corrugated waveguides [2,3] can achieve even wider...
Gyro-devices based on helically corrugated interaction region (HCIR) demonstrated capabilities of high power, high efficiency, high gain and wide frequency band [1–8]. A HCIR couples two partial modes resonantly and hence generates a operating eigenwave [9] with a near constant group velocity in small axial wavenumber region over a wide frequency band. In this paper the possibility and scalability...
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