Improvements in directional couplers of the branchline type.

摘要

In a directional coupler of the branchline type, each branch of the coupler consists of two coupled lines (A1, B1; A2, B2) of which only two out of their four ports, geometrically opposite, are connected in the circuit whereas the two remaining ports remain open. In this way the transverse section of the coupler branches is decreased and a good operation up to 20 GHz and the insulation in direct current of the four ports are obtained, so that the necessity of using condensers for bloching the direct current is eliminated when using active circuits.