Subharmonic harmonic mixer based on coplanar waveguide transmission lines

Abstract

The invention discloses a subharmonic harmonic mixer based on coplanar waveguide transmission lines. A dielectric substrate is arranged on the inner bottom face of a main air cavity and provided with a coupling probe, the coplanar waveguide transmission lines, a local oscillator matching line and microstrip transmission lines. The coplanar waveguide transmission lines comprise a matching line, a first transverse transmission line and a local oscillator lowpass filtering matching line, wherein the matching line, the first transverse transmission line and the local oscillator lowpass filtering matching line are connected sequentially from left to right, and the coupling probe is connected with the left end of the matching line. The microstrip transmission lines comprise a second transverse transmission line and a medium-frequency lowpass filtering matching line which are sequentially connected from left to right. The coplanar waveguide transmission lines further comprise two grounding lines located on the two sides of the matching line respectively and planar Schottky anti-parallel mixing diodes, the two grounding lines are connected with the inner wall of the main air cavity, an ohmic contact layer of one mixing diode is connected with the front face, away from the dielectric substrate, of the matching line, and an ohmic contact layer of the other mixing diode is connected with the front faces, away from the dielectric substrate, of the grounding lines.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a subharmonic mixer based on a coplanar waveguide transmission line. Background technique [0002] In almost all terahertz technology application systems, the terahertz receiving front-end is the core technology in the system, which completes the frequency conversion of terahertz signals. The terahertz subharmonic mixer is a key component of the terahertz receiving front end. At present, among the few types of mixers that can work in the terahertz frequency band, only terahertz subharmonic mixers based on planar Schottky diodes can work at room temperature, so subharmonic mixers are used as frequency Conversion devices play an important role in the field of terahertz applications. In the prior art, the subharmonic mixer realizes the grounding of RF and DC through the microstrip line and the upper cavity at the RF transition end, which not only increases the difficulty of asse...

AI Technical Summary

Problems solved by technology

[0007] In the existing technology, the subharmonic mixer realizes the grounding of RF and DC through the microstrip line and the upper cavity at the RF transition end, which not only increases the difficulty of assembly and reduces the accuracy of the circuit, but also the intermediate frequency and local oscillator signals only virtual ground

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