Design and Performance of a 600–720-GHz Sideband-Separating Receiver.pdf

We present the design, modeling, construction, and characterization of a sideband separating heterodyne receiver
that covers the frequency range from 600 to 720 GHz. The receiver has been constructed using waveguide technology in
the split-block technique. The core of the mixer consists of a quadrature hybrid, two directional couplers to inject the local
oscillator signal, two superconductor–insulator–superconductor（SIS) junctions, three signal-termination loads, and two planar
IF/bandpass-filter/dc-bias circuits.

这么厉害600-720G！{:7_1270:}

这么高的频率？

频率真高！

觉得国内的技术真的很落后

这个没写错吧    我咋觉得写得不太靠谱啊