High-temperature superconducting image rejection modeling method based on polarization regulation and correction network

A high-temperature superconducting, image suppression technology, applied in the direction of improving frequency converters, can solve the problems of high-temperature superconducting terahertz receiver modeling that has never been proposed, the difficulty of increasing the circuit due to radio frequency propagation loss, and low impedance characteristics. Low Power Requirement, Ease of Implementation, Effect of High Frequency Cap

Active Publication Date: 2021-06-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, considering the low-impedance nature of the HTS Josephson junction, and issues related to impedance matching and RF propagation loss significantly increase the difficulty of circuit design and further lead to gaps in modeling
So far, a high-temperature superconducting terahertz receiver with image rejection capability and its modeling have never been proposed

Method used

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  • High-temperature superconducting image rejection modeling method based on polarization regulation and correction network
  • High-temperature superconducting image rejection modeling method based on polarization regulation and correction network
  • High-temperature superconducting image rejection modeling method based on polarization regulation and correction network

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Embodiment 1

[0068] In this embodiment, a polarization-regulated terahertz hybrid circuit is designed, and the design method corresponds to step 1 of the content of the invention, such as figure 1 As shown, it includes a polarization converter, a beam splitter and a dual-polarized integrated lens antenna fed by two high-temperature superconducting Josephson junctions. The specific structure of the antenna is as follows figure 2 As shown, during specific implementation, a high-resistivity silicon lens 6 is installed on one end of the MgO substrate 7, and the surface of the other end is a gold film 8. There is an annular slit antenna 1 on the gold film 8, and the annular slit antenna 1 is connected to the radio frequency signal It has good pattern gain and radiation efficiency with the local oscillator signal. There are two ports 2 and 4 at the clockwise 90° and 180° positions of the circular slot antenna 1 and the corresponding coplanar waveguide is the circular slot antenna 1 Feed, the tw...

Embodiment 2

[0073] In this embodiment, a single-chip high-temperature superconducting image suppression receiver circuit is designed, and the design method corresponds to step 2 of the content of the invention, including a bias tee network and an intermediate frequency orthogonal coupling network, such as Figure 6 As shown, two bias tee networks 10 are designed on the gold film 8, each network has three ports, one end is connected to the fifth-order choke filter 3 of the polarization-regulated terahertz hybrid circuit, and the other end is used for high-temperature ultra- Conductor Josephson junctions 2 and 4 provide DC bias (the port has an intermediate frequency choke filter), and one end is connected to the intermediate frequency quadrature coupling network; the intermediate frequency quadrature coupling network is a two-node branch line connected to a 50Ω lumped resistance at the end A coupler, a 100nF lumped capacitor 9 is designed between the network and the bias tee network to sepa...

Embodiment 3

[0077] The method of the present invention provides a powerful tool for the mixing analysis and performance prediction of the high-temperature superconducting image-suppressing receiver for the modeling principle of the high-temperature superconducting image-suppressing receiver, and the specific derivation process is as follows:

[0078] Step 3.2 According to the equivalent circuit of the model and the principle of electromagnetic field, the noise temperature T of the high-temperature superconducting image suppression receiver is derived rec and conversion gain G rec The analytical expression of , specifically includes the following sub-steps:

[0079] Step 3.2.1 Establish a virtual radio frequency signal voltage source V rfs1 and V rfs2 The proportional relationship, the virtual local oscillator signal voltage source V los1 and V los2 proportional relationship;

[0080] Step 3.2.2 Based on the nonlinear relationship of the high-temperature superconducting Josephson junc...

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Abstract

The invention relates to a high-temperature superconducting image rejection modeling method based on a polarization regulation and correction network, and belongs to the technical field of microwave and terahertz communication and high-temperature superconducting. The method comprises the steps that (1) designing a polarization regulation and control terahertz hybrid circuit, wherein the hybrid circuit comprises a polarization converter, a beam splitter and a dual-polarization integrated lens antenna, and the design of the lens antenna comprises the design of an MgO substrate, a gold film, a circular ring slot antenna, two Josephson junctions and a five-order choke filter; 2) designing a monolithic high-temperature superconducting image rejection receiver circuit, including designing a bias three-way network and an intermediate-frequency orthogonal coupling network; 3) modeling the high-temperature superconducting image rejection receiver, namely establishing a model equivalent circuit and deducing an analytical expression. According to the method, a low-temperature facility is smaller and cheaper, is not easily interfered by a mirror image and is easy to implement; in this way, the connection loss, the module size and the thermal load can be reduced, and the problems that the network relation between the two sides of the three-port network model is difficult to establish and the formula derivation is complex are solved.

Description

technical field [0001] The invention relates to a high-temperature superconducting image suppression modeling method based on a polarization regulation and correction network, and belongs to the technical fields of microwave and terahertz communication and high-temperature superconducting. Background technique [0002] Compared with conventional semiconductor terahertz receivers, superconducting receivers have the advantages of low noise, extremely wide IF bandwidth, high frequency upper limit, and low power requirements; compared with low-temperature superconducting receivers, high-temperature superconducting receivers need to use Cryogenic facilities are more miniaturized and cheaper, and have good application prospects as front-end devices for terahertz communication systems. However, the existing high-temperature superconducting receivers are single-Josephson junction double-band mixers, which are susceptible to image interference if applied in a terahertz communication ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/18
CPCH03D7/18
Inventor 高翔代贤乐李焕新卜祥元安建平刘珩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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