| 摘要 |
PURPOSE:To suppress the reduction in an output at a fault to a value of nearly 3dB by constituting the titled circuit that a variable phase circuit inserted to one of two lines connecting two hybrids is controlled in response to the state of the final output. CONSTITUTION:Terminals of two 90 deg. hybrids 3, 4 are connected by the lines and the reflecting type variable phase circuit comprising a circulator 5 and lines 13, 14, 15 is inserted to one of the lines. A coupler 8 is to detect the final output state and when either of inputs 1a, 1b is interrupted for example, the coupling output is changed. The change is detected by a detector 9 and either of switches 11, 12 is driven by a controller 10 and the phase amount is controlled. As a result, the output is extracted only at an output terminal 2a. That is, even if one input is interrupted, the output reduction is suppressed to 3dB. |
