Base of waveguide sideband-separating superconducting tunnel junction mixer

Abstract

The invention discloses a waveguide sideband-separation superconducting tunnel junction mixer, which is characterized in that the central position of an input end face of a base of the mixer is provided with a first waveguide input inlet and a second waveguide input inlet; a first signal waveguide and a second signal waveguide extend forwards from the waveguide input inlets along the direction perpendicular to the input end face of the base; then, the first and second signal waveguides are subject to the first vertical bending along opposite directions and then respectively extend leftwards and rightwards to the left and right ends of the base; finally, after the first and second signal waveguides are subject to two vertical bending again, the widths of the signal waveguides gradually decrease, and the extensions of the signal waveguides are ended until the first and second signal waveguides extend to the position near a longitudinal axis of the base; a first reference signal waveguide extends backwards along the direction perpendicular to the front end face of the base, and then is divided into a second reference signal waveguide and a third reference signal waveguide by a local oscillator divider; the second reference signal waveguide and the third reference signal waveguide are subject to vertical bending after extending to the position near the first signal waveguide and the second signal waveguide subjected to the first bending; and then the extensions of the second and third reference signal waveguides are ended after extending to the positions of the first and second signal waveguides subjected to the second vertical bending along the directions parallel to the first and second signal waveguides respectively extending leftwards and rightwards.

Description

technical field [0001] The invention belongs to a microwave waveguide element, in particular to a microwave mixer base which utilizes a superconducting tunnel junction mixer to realize separated output of upper and lower sidebands. Background technique [0002] Weak signal detection technology in the millimeter wave and submillimeter wave bands is a key technology in radio astronomy observation, and it also has potential application value in the fields of atmospheric environment and resource remote sensing. The superconducting tunnel junction mixer is one of the most sensitive detectors in this frequency band, so it is widely used in the radio telescope receiving system in the millimeter wave band and submillimeter wave band as the first-level signal sensor. There are mainly three types of superconducting mixing circuits currently used: double-sideband mixing, single-sideband mixing, and sideband-separated mixing. The double-sideband mixer mixes the input signals of the upp...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: increase the magnetic field bias on the basis of the existing waveguide type sideband separation type mixer, solve the increase of mixer noise caused by Josephson current and the gain compression caused by excessive gain and stability degradation, while enabling the IF output to be drawn from the rear of the mixer body, making the new structure suitable for mixer array applications

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