Ensuring the required electrical parameters in coaxial switches

Abstract

A coaxial switch is a device designed to select between multiple coaxial data or signal transmission lines. It finds application in a variety of fields, including telecommunications, electronics, and satellite communications. This switch allows switching between different devices and directing signals in the desired direction. One of the main advantages of a coaxial switch is its ability to operate over wide frequency ranges. However, the electrical requirements are very high. Electromechanical coaxial switches must have high response speed (short switching time), low VSWR and insertion loss, and high isolation (microwave blocking between inactive channels).
The presented microwave switch design achieves parameters no worse than 1.3 VSWR, 0.4 dB loss, and 70 dB isolation in the range up to 30 GHz. The switch's operating principle is explained in detail, and the key technical solutions used to achieve such complex parameters are presented. Below is a description of the main geometric deviations in microwave channels that adversely affect electrical performance. These deviations were analyzed using numerical simulation. The results of these deviations are in complete agreement with those observed experimentally.
This paper analyzes the main geometric deviations in the dimensions and shape of components that affect the isolation between inactive channels of a coaxial switch, as well as the VSWR and losses in the active channels. These deviations can also reduce the performance of other coaxial microwave devices. Analyzing these devices based on these deviations will help specialists resolve electrical parameter issues and improve product yield during mass production.

Speaker

Sergey Molchanov
Stock Company «Research-and-Production Enterprise «Almaz»
Russia

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