MILLIMETER-WAVE BAND SPECTRUM ANALYSIS DEVICE AND ANALYSIS METHOD

摘要

An input signal Sx in a first millimeter-wave frequency band higher than 100 GHz is input to a millimeter-wave band filter 20 in which a pair of radio wave half mirrors 30A and 30B so as to opposite to each other and which performs a resonance operation. A signal component Sa corresponding to the resonance frequency of the filter is extracted, is mixed with a first local signal L1 with a fixed frequency, and is converted into a signal in a second frequency band. The converted signal component Sb is mixed with a second local signal L2 whose frequency is swept and is converted into a signal in a predetermined intermediate frequency band. Then, the level of the signal is detected. The millimeter-wave filter 20 has high selectivity characteristics in a frequency domain higher than 100 GHz and can change its passband center frequency.

主权项

1. A millimeter-wave band spectrum analysis device comprising:
a millimeter-wave band filter that includes a transmission line which is formed by a waveguide that propagates electromagnetic waves in a first millimeter-wave frequency band from one end to the other end in a TE10 mode, a pair of planar radio wave half mirrors which are arranged so as to be opposite to each other with a distance therebetween while blocking the inside of the transmission line, transmit some of the electromagnetic waves in the first frequency band, and reflect some of the electromagnetic waves, and resonance frequency change means for changing an electrical length between the pair of radio wave half mirrors to change a resonance frequency of a resonator formed between the pair of radio wave half mirrors in the first frequency band, extracts a signal component in a band having the resonance frequency as a passband center frequency from a signal which is input from one end of the transmission line, and outputs the signal component from the other end; a frequency conversion unit that mixes the output signal from the millimeter-wave band filter with a first local signal with a fixed frequency to convert the output signal into a signal in a second frequency band lower than the first frequency band; a spectrum detection unit that converts each frequency component of the signal in the second frequency band which is converted by the frequency conversion unit into each frequency component in a predetermined intermediate frequency band using a second local signal whose frequency can be swept and detects the level of each frequency component; and a control unit that stores data which associates the resonance frequency with the electrical length between the pair of radio wave half mirrors of the millimeter-wave band filter in advance, changes the passband center frequency of the millimeter-wave band filter so as to cover an observation frequency range on the basis of the data when frequency resolution and a desired observation frequency range of the first frequency band are designated, controls the sweep of the frequency of the second local signal of the spectrum detection unit, and detects a spectrum waveform of a signal in the observation frequency range with the frequency resolution.