| 摘要 |
PURPOSE:To reduce the loss of frequency conversion by arranging filters, which are distributed and coupled to an input line end of a mixer, at the interval of a prescribed angle. CONSTITUTION:Local oscillators 33 and 34 output local oscillation signals fL1 annnd fL2 by the power supplied from a power source 31 through a switch 32. These output signals are supplied to a mixer 37 through local oscillation frequency-pass filters 35 and 36. Coupling with an input line 382 of the mixer 37 is performed by distributed coupling between resonance lines 350 and 360 of filters 35 and 36 and the input line 382. Since resonance line parts 352 and 362 are arranged apart from each other, unnecessary coupling in the passage frequency band is prevented to reduce the loss of frequency conversion. |
