Microwave receiving device

DETAILED DESCRIPTION The present invention has been made to solve the conventional problems described above, and has as its object to provide a compact microwave receiving device having functions of a primary radiator and a low-noise converter.
According to the present invention, there is provided a microwave receiving device for receiving a microwave transmitted as a circularly polarized wave, comprising: chassis means having an opening at one end thereof, the opening having a shape for providing predetermined directivity characteristics; waveguide means having a circular cross section and formed inside the chassis means from the opening of the chassis means along substantially the entire length of the chassis means; circularly polarized wave-to-linearly polarized wave converting means, arranged inside the waveguide means, for converting a circularly polarized wave propagating through the waveguide means into a predetermined linearly polarized wave; probe means, extending into the waveguide means through the chassis means, for receiving the predetermined linearly polarized wave, converting the wave into an electrical signal, and outputting the electrical signal outside the chassis means; microwave circuit board means mounted on the chassis means so as to surround at least part of the waveguide means and connected to the probe means, the microwave circuit board means being provided with a microwave circuit for performing predetermined signal processing of the electrical signal output from the probe means; and connector means, connected to the microwave circuit board means, for externally outputting the electrical signal processed by the microwave circuit.