Ka frequency range high-power waveguide rotary joint

Abstract

The invention discloses a Ka frequency range high-power waveguide rotary joint consisting of an upper half and a lower half which are mutually connected and respectively connected by a T-shaped branch with an H surface and a TM01 mode conversion part; the TM01 mode conversion part comprises a rectangular straight waveguide and a round waveguide; the round waveguide is arranged at the center of the rectangular straight waveguide and is butted with the wide side of the rectangular straight waveguide which is in a symmetric form relative to the centre of the circle of the round waveguide; and two branches of the T-shaped branch with an H surface are connected with two ports of the rectangular straight waveguide. With a bilateral symmetric exciting TM01 mode method, a path of signals is decomposed into two paths of signals with equal width and same phase by the T-shaped branch with an H surface so that the correlation to a frequency is greatly lowered when a TE11 mode is inhibited, the high inhibition on the TE11 mode is realized within larger bandwidth, and the stability of the electrical property of the rotary joint in rotating is realized.

Description

Technical field [0001] The invention belongs to the field of microwave communication, and relates to a high-power rotary joint, in particular to a Ka-band high-power waveguide rotary joint with bilateral symmetric excitation. Background technique [0002] In microwave communication, the rotary joint is used to realize the transmission of microwave signals between the dynamic antenna system and the static transmitting system and receiving system. Therefore, its structural design should meet the electrical performance requirements as much as possible while meeting the dynamic movement of the antenna. The structural requirements. [0003] At present, the commonly used rotary joints include a coaxial rotary joint loaded with media and a full-waveguide TM01 mode rotary joint with unilateral excitation. The use of media-loaded coaxial rotary joints, due to the large loss of media, will cause large heat loss, which is not conducive to high-power use on the satellite. The full-waveguide ...

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Problems solved by technology

However, the TM01-mode converter adopts double-slit symmetrical excitation. Since the double-slit is narrow, the micro-discharge margin is small, which is not conducive to high-power use, and due to the influence of the short-circuit surface during double-slit excitation, the electric field near the double-slit appears localized. Inhomogeneity, resulting in its suppression of the TE11 mode increases in the Y direction and frequency correlation, narrowing the suppression bandwidth

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