A low temperature directional coupler
A directional coupler and low-temperature technology, which is applied in the direction of waveguide devices, electrical components, connecting devices, etc., can solve problems such as unsuitable circuits, excessive size specifications, etc., achieve small size, ensure usability, and reduce length.
Active Publication Date: 2016-01-06
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
Ordinary directional couplers are not suitable for circuits working in extremely low temperature environments due to their coupling parameters changing with temperature and excessive size specifications.
Method used
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[0014] Such as figure 1 As shown, the present invention includes: a microstrip line 1, a dielectric board 2, a bottom metal 3 and a via hole 4; the microstrip line 1 is printed on the upper surface of the dielectric board 2, and the bottom metal 3 is covered and plated on the lower surface of the dielectric board , the via hole 4 is opened through the dielectric plate, so that the corresponding part of the microstrip line 1 on the upper surface is connected to the underlying metal 3 on the lower surface. Among them, the medium plate 2 is selected from Rogers RT6010 plate with a thickness of 0.5-1 mm, and 0.635 mm is selected in the embodiment of the present invention. The underlying metal 3 is covered and plated with metal copper, with a thickness of 15-40 mils, and 18 mils is selected in the embodiment of the present invention. The via hole 4 is an upper and lower via hole through the dielectric board, and its function is to make the microstrip line punched on the upper surf...
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The invention discloses a low-temperature directional coupler, which comprises a microstrip line, a medium plate, an underlying metal and a through hole, wherein the microstrip line is printed on the upper surface of the medium plate; the underlying metal is covered and plated on the lower surface of the medium plate; the through hole is punched in the medium plate, so that a corresponding part of the microstrip line on the upper surface is connected with the underlying metal on the lower surface; the microstrip line comprises a through hole, a coupling line and joint bonding pads; the joint bonding pads are positioned on both sides of four ports; and through holes are punched in positions below the joint bonding pads, so that the joint bonding pads are fully contacted with the underlying metal. The low-temperature directional coupler has a parameter property which is approximate to that in a room temperature environment in the extremely low-temperature environment of a liquid nitrogen temperature, is small in size, and can be used for diluting refrigerating equipment such as refrigerators; and meanwhile, the low-temperature directional coupler has a large working bandwidth, and has a wider application range in radiofrequency wavebands.
Description
technical field [0001] The invention relates to a low-temperature directional coupler suitable for extremely low-temperature conditions, and belongs to the technical field of radio frequency circuits. Background technique [0002] A directional coupler is a common microwave device, generally a directional four-port passive device. An ideal directional coupler is a lossless and reciprocal four-port network, generally composed of two sets of mutually coupled transmission lines, the main line and the secondary line. During the signal transmission process, due to the mutual coupling between the main line (straight-through line) and the secondary line (coupled line), the power transmitted in the main line can be coupled to the secondary line, and the power propagation in the secondary line is directional, that is, the secondary line Power in the wire travels in only one direction. There is no output in the other direction. The effect of the directional coupler is to distribute...
Claims
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IPC IPC(8): H01P5/18
Inventor 刘哲雨郭国平李海鸥曹刚肖明郭光灿
Owner UNIV OF SCI & TECH OF CHINA