| 摘要 |
PROBLEM TO BE SOLVED: To provide an endless phase shifter where the number of kinds of hybrid circuits is reduced. SOLUTION: A 90 deg. hybrid circuit 2 branches a signal S1 branched in phase with an input signal Si by a 90 deg. hybrid circuit 1 further into signals S1a, S1b that are in phase and lagged by 90 deg.. A 90 deg. hybrid circuit 3 branches a signal S2 branched with a phase lag of 90 deg. from the input signal Si further into signals S2a, that are in phase and lagged by 90 deg.. Variable attenuators 7a, 7b and 8a, 8b respectively apply prescribed attenuation to the signals S1a, S1b and the signals S2a, S2b. A pair of 90 deg. hybrid circuits 4, 5 receive the outputs of the variable attenuators 7a, 7b and 8a, 8b and cause an additional 90 deg. phase delay to the signals delayed by 90 deg. and synthesize them to output signals S3, S4. An in-phase hybrid circuit 6 synthesizes the signals S3, S4 in phase to provide an output signal So to which a prescribed phase shift is applied.
|
