Directional coupler with high directional damping - places two wave guides in parallel but offset so that distance between them steadily increases from one end to other, length being smaller than quarter of working wavelength at band mean frequency

摘要

The directional coupler consists of two wave guides (L1, L2) coupled with one another over a length (1), the distance between them in the coupling region increasing continuously from one end to the other. The coupling region has a length selected so that it is smaller than a quarter of the working wave length in the middle of the frequency band and the distance between the wave guides increases so that the difference between the electrical length of the region for the synchronised wave and that for the push-pull wave is as small as possible. USE/ADVANTAGE - Improved directional damping, with low cost units. Microwave range systems.