Improved sub-harmonic mixer based on coplanar waveguide transmission line

Abstract

The invention discloses an improved sub-harmonic mixer based on a coplanar waveguide transmission line. The improved sub-harmonic mixer is characterized in that a dielectric substrate is arranged on the inner bottom surface of a main air chamber; a coupling probe, the coplanar waveguide transmission line, a local oscillator matching line and a micro-strip line structure are arranged on the dielectric substrate; the coplanar waveguide transmission line comprises a matching line, a first horizontal transmission line and a local oscillator low-pass filter matching line which are connected in sequence from left to right; the micro-strip line structure comprises a second horizontal transmission line, a third horizontal transmission line, a fourth horizontal transmission line and an intermediate-frequency low-pass filter matching line which are connected in sequence from left to right; the coplanar waveguide transmission line further comprises two grounding lines respectively positioned on the two sides of the matching line; the two grounding lines are connected with the inner wall of the main chamber. The improved sub-harmonic mixer further comprises planar Schottky anti-parallel mixer diodes, wherein an ohmic contact layer of one of the mixer diodes is connected with the front surface, far away from the dielectric substrate, of the matching line, and an ohmic contact layer of the other mixer diode is connected with the front surface, far away from the dielectric substrate, of the grounding line.

Description

technical field [0001] The invention relates to the technical field of terahertz, and specifically refers to an improved 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 th...

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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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