A compact rectangular te 10 -Circular waveguide tm 01 Mode conversion device

Abstract

The invention discloses a compact rectangular TE10-circular waveguide TM01 mode conversion device, which belongs to the technical field of microwave and millimeter waves. The device includes a rectangular waveguide, a coaxial waveguide, a stepped coaxial waveguide and a stepped circular waveguide. The TE10 mode input from the standard rectangular waveguide is converted into the TE10 mode of the flat waveguide through the steps, and then the coaxial TEM mode is fed into the coaxial waveguide through the sidewall to generate the coaxial TEM mode and input into the stepped coaxial waveguide; The TEM mode passes through the step-by-step transition of the stepped coaxial waveguide, and the circular waveguide TM01 mode is excited at its end; the output end adopts the stepped circular waveguide structure, and on the premise of ensuring the output purity of TM01, the outer diameter of the coaxial waveguide is made to transition step by step. to the output port and match. The device can generate TM01 mode output with mode purity greater than 99.5% within the BJ100 full waveguide bandwidth; the length of the rectangular waveguide segment is less than 95mm, and the length of the circular waveguide segment is less than 90mm. Small.

Description

technical field [0001] The invention belongs to the field of microwave and millimeter wave technology, in particular to an X-band rectangular waveguide TE 10 Mode-Circular Waveguide TM01 high-purity mode conversion device, especially suitable for TM 01 Pattern exciter applications. Background technique [0002] In the application of high-power microwave devices, connection problems between different devices and different interfaces are very common. When the mode of the required waveform is different from that of the existing waveform, a mode converter is required for transition connection. Mode conversion is a broad concept, theoretically it includes all devices capable of mode conversion. For most high-power microwave sources, such as relativistic Cherenkov devices, gyrotron devices, virtual cathode oscillators, etc., the working mode is generally a circular waveguide symmetric phantom (TE 0n 、TM 0n ) or advanced side corridor mode (TE mn , m>>1, n~1, 2). Some o...

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Problems solved by technology

conventionally designed TM 01 The working frequency band of the mode converter is narrow, the relative bandwidth is about 10%, and the overall structure is complex, which requires a dielectric support design, and the device size is large; there are improved structures such as those designed by Abdelwahed Tribak et al. in "ULTRA-BROADBAND HIGH EFFICIENCY MODE CONVERTER" The mode converter adopts the stepped coaxial inner conductor and the stepped rectangular-coaxial mode matching structure, which greatly improves the relative bandwidth and return loss of the device; but on the other hand, in order to reduce the discontinuity of the device to the Due to the influence of reflection and conversion efficiency during the period, the size of the coaxial inner conductor of the device is only 1mm, which is actually unable to bear the "dumbbell" structure of the device. Although the simulation results are excellent, the practical application is very limited

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