CPC H01P 5/227 (2013.01) [H01P 5/18 (2013.01)] | 9 Claims |
1. A branch-line coupler, adapted to radio frequency circuits, comprising:
an input port;
a first output port;
a second output port;
an isolated port;
a first transmission line having two first open branches, electrically connected between the input port and the first output port;
a second transmission line having two second open branches, electrically connected between the isolated port and the second output port;
a first bent branch line, electrically connected between the input port and the isolated port; and
a second bent branch line, electrically connected between the first output port and the second output port, wherein the two first open branches and the two second open branches are fishbone-like structures.
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