Patent ID: 8300734
Filing Date: 2012-10-30
Classification: G01R,H03D

Abstract:
1. A frequency converting system comprising: an input part to which an input signal x(t) including a predetermined frequency domain {f a local signal generation part including M local signal generators which are provided to correspond to the signals of the respective bands output from the signal branching section, wherein the M local signal generators output M local signals each having a frequency (fc a frequency converting part which respectively mixes the signals of the respective bands output from the signal branching section, and the local signals corresponding to the signals of the respective bands output from the local signal generators with each other to convert the signals of the bands into signals of intermediate frequency bands each including the intermediate frequency as the center frequency, wherein the frequency converting part converts the signals of the intermediate frequency bands into digital signals, and outputs the converted digital signals; and a signal regeneration part for subjecting the digital signals output from the frequency converting part to frequency conversion processing, combining the digital signals subjected to the frequency conversion processing with each other, and regenerating the signal included in the predetermined frequency domain as a digital signal of a frequency domain (f wherein the signal branching section includes plural branching units, each of which comprises a circulator and a band-pass filter connected to a first input/output port of the circulator closer to an input port of the circulator when viewed from the input port in a signal transmission direction, wherein the plural branching units are for extracting, in a pass band narrower than the predetermined frequency domain, a signal component of at least one of the divided bands, and for separating a signal input to the input port of the circulator into signal components extracted by the band-pass filter, and signal components output from a second input/output port of the circulator farther from the input port of the circulator when viewed from the input port in the signal transmission direction, and wherein the plural branching units are connected in a tree-like form in a plurality of stages in a state where the pass band widths of the branching units are narrowed from a former stage toward a latter stage, and the signal components of the respective bands are output in parallel from the respective branching units in a final stage.