Broadband directional coupler

Abstract

The invention relates to a broadband directional coupler comprising a cavity in which a conductor mainline and a conductor subline are arranged; two ends of both the conductor mainline and the conductor subline are respectively connected with a connector; the section shape of both the conductor mainline and the conductor subline is round; the conductor mainline and the conductor subline are divided into a conductor main body and conductor connecting bodies; two ends of the conductor main body are respectively connected with the conductor connecting bodies; and the other ends of four conductor connecting bodies, which are not connected with the conductor main body are respectively connected with the connector. The multi-section, concentric-round, conductor directional cavity coupler has advantages of smaller coupling plainness, high directivity, low intermodulation, low insertion loss, high power and easy processing.

Description

technical field [0001] The invention relates to a coupler used in the technical fields of communication and radar, in particular to a directional cavity coupler. Background technique [0002] Directional couplers are used to distribute or synthesize power in a specific proportion of microwave signals, and are one of the most commonly used components in the field of microwave technology. The main indicators of directional couplers are coupling degree, coupling flatness, directivity, standing wave ratio, third-order intermodulation, etc. In order to achieve high-power applications, the existing directional couplers mostly appear with air cavity rectangular stripline structures and air cavity circular single-section striplines; in order to achieve broadband or ultra-wideband applications, directional couplers mostly use multi-level parallel coupling lines Generally speaking, once the bandwidth and the number of cascade series are determined, the coupling degree and coupling fl...

AI Technical Summary

Problems solved by technology

Regardless of the structure, the following problems will be faced in the process of producing broadband couplers: ①The distance between the parallel coupled line conductors in the tightly coupled part of the broadband coupler is too small, such as for 3DB couplers, the depth of the cavity and the size of the conductor cross section The influence on the spacing is not prominent, the conductor spacing is about 0.3mm, and the processing is not easy to control accurately, resulting in obvious changes in the coupling degree and coupling flatness during production, and a large amount of index debugging; ②Parallel coupling of the loosely coupled part of the broadband coupler The distance between the line conductors is too large, the wider the bandwidth, the larger the spacing, and the larger the discontinuity; the wider the bandwidth, the more stages, and the looser the coupling in production, the coupler has poor directivity and standing wave ratio.

The first two problems above directly affect production efficiency and yield, and the third problem limits high-power applications

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