| 摘要 |
PCT No. PCT/JP84/00004 Sec. 371 Date Aug. 29, 1984 Sec. 102(e) Date Aug. 29, 1984 PCT Filed Jan. 13, 1984 PCT Pub. No. WO84/03008 PCT Pub. Date Aug. 2, 1984.A frequency converter is constituted by an unobstructed circular waveguide unit through one end of which received signals are fed thereto and conveying signals in the TE11 mode, a rectangular waveguide unit having a rectangular waveguide microstrip line converter unit in its output end and conveying signals in the TE10 mode, a circular-rectangular waveguide converter unit connecting the output end of the circular waveguide unit and the rectangular waveguide unit to convert the mode of transmission of signals from the TE11 mode in the circular waveguide unit to a principal transmission mode TE10 in the rectangular waveguide unit, and a microwave integrated circuit extending in the direction of and being on the H-wall side of the circular-rectangular waveguide converter unit and the rectangular waveguide unit and connected to the rectangular waveguide-microstrip line converter unit for processing the received signals and delivering the received signals as signals of an intermediate frequency. The diameter of the circular waveguide unit is such as to cause the cutoff frequency of the circular waveguide unit to be lower than the frequency of the received signal and higher than the local oscillation frequency for causing the circular waveguide unit to function as a high pass filter, and the axis of the rectangular waveguide unit is offset relative to that of the circular waveguide unit in the direction parallel to the shorter side of the rectangular waveguide unit and toward the wall along which the microwave integrated circuit is positioned. |
