The invention provides a terahertz
frequency mixing antenna and a quasi-optical
frequency mixing module. The terahertz
frequency mixing antenna comprises a first
schottky diode, a second
schottky diode, a planar antenna and a blocking condenser, wherein a negative pole of the first
schottky diode is connected with a positive pole of the second schottky
diode through the blocking condenser, and a positive pole of the first schottky
diode is connected with a negative pole of the second schottky
diode directly or through a resistance. The schottky diodes are arranged on
radio frequency feed ports of the planar antenna, a
radio frequency signal and a local oscillating
signal are fed in a space
coupling mode through the planar antenna, and an
intermediate frequency signal is output after the frequency mixing of the schottky diodes and is output in a guided
current mode from the outermost side of the planar antenna. The quasi-optical frequency mixing module comprises the terahertz frequency mixing antenna, a bias and
intermediate frequency circuit and a planar
transmission line. The terahertz frequency mixing antenna and the quasi-optical frequency mixing module are capable of being operated in a sub-
harmonic frequency mixing mode or a fundamental
wave frequency mixing mode, and being connected with a standard circuit port easily. Due to the fact that
direct current bias is loaded on the frequency mixing antenna, requirements of local oscillating power is reduced.