Patent ID: 6871056

Claim:
A NRD waveguide mixer comprising: a housing including a pair of opposed parallel conductive plates; a ring hybrid coupler installed in the housing, the ring hybrid coupler having an annular ring and first to fourth ports radially extending about the annular ring; an oscillating means connected to the first port so as to generate a local oscillating signal; a rod antenna connected to the second port so as to receive/transmit a radio frequency signal; a first balanced mixer mount connected to the third port and provided with a first Schottky diode; and a second balanced mixer mount connected to the fourth port and provided with a second Schottky diode, wherein the radio frequency signal inputted from the first port and the oscillating signal inputted from the second port are mixed in the ring hybrid coupler to be transformed into an addition signal and a subtraction signal, and the addition and subtraction signals are transmitted to the third and fourth ports to switch the first and second Schottky diodes, respectively, so that an intermediate signal is generated.