Abstract
The paper presents the results of electromagnetic modelling in the computer-aided design system and electrical parameters measurements of microwave band waveguide-to-coaxial adapters. Adapters are developed, manufactured and tested at Micran.
Highlights
In microwave transmission lines it is often necessary to switch from one type of transmission line (TL) to another, e.g. from coaxial line to a rectright-angle or a circular waveguide, or from coaxial line to microstrip, etc
Special devices called adapters are designed for these purposes.Adapters break the regularity of the transmission line, and should be well matched on each of the inputs and should not reduce the electrical strength of the line[1]
In order to match the waveguide and coaxial parts, it is necessary to match the active parts of the wave line impedance while minimizing their reactive components using a step transformer
Summary
In microwave transmission lines it is often necessary to switch from one type of transmission line (TL) to another, e.g. from coaxial line to a rectright-angle or a circular waveguide, or from coaxial line to microstrip, etc. Coaxial and waveguide TL are most often used. Waveguide to coaxial adapter (WCA) are used to join them. There are 2 basic types of WCA design: straight and right angle with different types of electrical coupling. Right-angle WCA has a simpler design than straight one. Due to the tuning elements, the right-angle WCA has better VSWR compared to the straight one. In complex microwave systems there are often situations when the usage of right-angle WCA is impossible because of their design. In the given paper the technique of modeling of straight WCA in the system of computer-aided design (CAD) is considered, as well as the results of measurement of straight WCA prototypes
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