A planar annular microstrip slow-wave structure

Abstract

The invention discloses a planar ring microstrip slow wave structure, belongs to the field of microwave electric vacuum technology, and relates to a traveling wave tube amplifier. It includes a dielectric substrate (2) and a metal wire (1) located on the surface of the dielectric substrate (2), characterized in that the metal wire (1) is a periodic structure formed by sequentially connecting a plurality of annular units with the same shape and size, Each annular unit is formed by butting two split rings with upper and lower mirror planes symmetrical, and two adjacent annular units are connected by a microstrip line at the junction of the two split rings. Compared with the existing microstrip slow wave structure, the present invention has wider cold bandwidth, so the vacuum device adopting the structure of the present invention can be used in a higher operating frequency band under the same size; the planar ring microstrip slow wave provided by the present invention The structure has a wide lateral dimension, which can effectively reduce the requirements on the electron gun and focusing magnetic field; and has a high coupling impedance, which can better interact with the electron beam, so it is a kind of small The slow wave structure of planar traveling wave tube.

Description

technical field [0001] The design of the invention belongs to the field of microwave electric vacuum technology, and relates to a traveling wave tube amplifier. Background technique [0002] Traveling wave tube amplifier is a microwave vacuum device that amplifies high-frequency signals through the energy exchange between electromagnetic field and electron beam. As an important microwave power source, traveling wave tube plays a pivotal role in the field of vacuum electronics due to its advantages of high power, high gain, high efficiency, broadband and long life, and is widely used in electronic countermeasures, communications, field of guidance. [0003] At present, helical traveling wave tubes and coupled cavity traveling wave tubes are the most widely used in various fields. The helical slow wave structure is a slow wave system widely used in traveling wave tubes. The helical slow-wave structure has the advantage of wide operating bandwidth, but it is bulky and very bu...

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Problems solved by technology

[0007] On the basis of the three-dimensional ring-rod structure, the present invention proposes a two-dimensional planar ring microstrip slow-wave structure, which has a wider working bandwidth and higher coupling impedance, effectively solving the three-dimensional ring-rod structure. The problem of the narrow frequency band of the rod slow wave structure; compared with the existing microstrip slow wave structure, under the same size, the planar ring-rod microstrip slow wave structure can work in a higher frequency band, which requires electron guns and focusing magnetic fields is also relatively low, so it is a slow wave structure suitable for miniaturized planar traveling wave tubes with great potential

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