Abstract
The HE11 hybrid mode, propagating in an overmoded corrugated circular waveguide, is widely used for low loss transmission of high-power microwaves. Due to the inherent broadband frequency behaviour, this will be also essential for future broadband high-power radar applications, like space debris observation in low earth orbit (LEO). A promising amplifier concept for such radar sensors is a helical gyro-TWT. However, since the HE11 hybrid mode is not suitable for electron-beam-wave interaction in this kind of vacuum electron device, an additional mode converter is required. The present paper addresses the design procedure of a broadband high-power mode converter, designed for a helical gyro-TWT intended for future broadband high-power radar applications in the W-band. The interaction mode of the helical gyro-TWT under consideration can be easily transferred to the circular waveguide TE11 mode. Therefore, a TE11 ↦ HE11 mode converter is addressed here. The design procedure is based on a scattering matrix formalism and leads to a high HE11 mode content of ≥98.6% within the considered frequency range from 92 GHz to 100 GHz. Inside this frequency band, the mode content is even better and reaches ≈ 99.7% at ≈95 GHz. This allows broadband frequency operation of a helical gyro-TWT and is suitable for broadband high-power radar applications.
Highlights
Helical gyro-TWTs are considered as promising broadband high-power amplifiers for future microwave applications, like advanced radar sensors for space debris observation in low earth orbit (LEO)
Note that the present paper focused on the elaborated design procedure for broadband highpower TE11 ↦ HE11 mode converters
The present paper addresses the design procedure for a broadband high-power TE11 ↦ HE11 mode converter
Summary
Helical gyro-TWTs are considered as promising broadband high-power amplifiers for future microwave applications, like advanced radar sensors for space debris observation in low earth orbit (LEO). To realize a W-band radar sensor with such a high transmission power, a suitable high-power amplifier as well as an appropriate transmission line is required. A suitable transmission mode is the HE11 hybrid mode, propagating in a corrugated circular waveguide. The amplified microwave signal has to be converted into the HE11 hybrid mode, after leaving them interaction circuit. Since the broadband frequency behaviour of the transmission line components may be sensitive in respect to the mode content [14, 15], a mode purity as best as possible is required, within the considered frequency range. The frequency range from 92 GHz to 100 GHz is considered
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