Low-temperature cavity filter

Abstract

The utility model discloses a low temperature cavity filter, the filter comprises an input end, an output end, a filter cavity and an alloy inner core, the alloy inner core is located in the filter cavity, and the two ends of the alloy inner core are fixed on the inner wall of the filter cavity through insulating spacers; the input end and the output end are arranged on two sides of the filter cavity and are connected with the alloy inner core; the alloy inner core is of a string type alloy structure formed by sequentially connecting a plurality of conductor units in series; the structure is simple and assembling and debugging are easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to microwave radio communication technical field, concretely relates to a low temperature cavity filter. BACKGROUND

[0002] Quantum computer is a kind of computer that follows quantum mechanics law and carries out high-speed mathematical and logic operation and processes quantum information, however, efficient and fragile coexist, superconducting quantum bit chip works in mK temperature zone, and any irrelevant signal can bring disturbance to the operation process that quantum chip is processing, therefore, a large number of cryogenic filters must be introduced to suppress noise.Cryogenic cavity filter can work in the environment close to absolute zero together with quantum chip, and has small power consumption, good heat dissipation performance and small volume and high integrability, which makes cryogenic cavity filter can effectively improve the signal quality delivered to quantum chip.But the filter structure used in the related art is generally complex, such as the patent application document with publication number CN112305652A discloses an infrared filter, which combines infrared absorbing material, filter assembly and attenuator together through certain design, and the structure is relatively complex. SUMMARY

[0003] The technical problem to be solved by the utility model lies in how to provide a low temperature cavity filter with simple structure.

[0004] The utility model solves the above technical problem by the following technical means:

[0005] A kind of low temperature cavity filter is presented, the filter includes input end, output end, filter cavity and alloy inner core, the alloy inner core is located inside the filter cavity, the both ends of the alloy inner core are fixed to the inner wall of the filter cavity by insulating gasket;The input end and the output end are arranged at the two sides of the filter cavity and are connected with the alloy inner core;The alloy inner core is the series alloy structure formed by the conductor unit of several in turn.

[0006] Further, the alloy inner core is prepared from red copper.

[0007] Further, the conductor is cylindrical.

[0008] Further, the alloy inner core and the input end, the output end are all detachably connected.

[0009] Further, the conductors at the head and tail of the alloy inner core are fixed to the inner wall of the filter cavity by the insulating gasket respectively.

[0010] Further, the filter cavity includes first cavity and second cavity, and the first cavity and the second cavity are threadedly connected.

[0011] Further, the input end connector and the output end connector adopt one of SMA, N and DIN.

[0012] Further, the insulating gasket is made of polytetrafluoroethylene.

[0013] Further, the filter wall cavity is made of copper.

[0014] The low-temperature cavity filter has the advantages that: the two ends of the alloy inner core are fixed in the filter cavity through the insulating gaskets, thereby forming the main functional components of the filter; the input end and the output end are arranged on the two sides of the filter cavity and connected with the alloy inner core inside the filter cavity; the alloy inner core adopts a single series alloy structure, which is simple in structure, easy to manufacture and convenient to assemble, so that the filter is easy to produce, assemble and debug.

[0015] Additional aspects and advantages of the present application will be described in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure schematic view of a low-temperature cavity filter according to an embodiment of the present application.

[0017] In the drawings:

[0018] 1 - first cavity; 2 - second cavity; 3 - alloy inner core; 4 - insulating gasket; 5 - input end; 6 - output end. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] As shown in Figure 1 the present embodiment proposes a low-temperature cavity filter, which comprises an input end 5, an output end 6, a filter cavity and an alloy inner core 3. The alloy inner core 3 is located inside the filter cavity, and the two ends of the alloy inner core 3 are fixed to the inner wall of the filter cavity through insulating gaskets 4. The input end 5 and the output end 6 are arranged on the two sides of the filter cavity and connected with the alloy inner core 3. The alloy inner core 3 is a series alloy structure formed by a plurality of conductor units connected in series.

[0021] Specifically, the main functional components of the filter are formed by fixing and supporting the two ends of the alloy inner core 3 through the insulating pads 4 respectively, the input end 5 and the output end 6 are arranged on the two sides of the filter cavity and connected with the alloy inner core 3 inside the filter cavity, and the alloy inner core 3 adopts a single series alloy structure, which is simple in structure, easy to process and manufacture, and convenient to assemble, so that the filter is easy to produce, assemble and debug.

[0022] In an embodiment, the alloy inner core 3 is made of red copper (T2Y), which has a high copper content, high conductivity and good processing performance.

[0023] In an embodiment, the conductor is cylindrical.

[0024] It should be noted that the size, spacing and number of the cylindrical conductors are related to the filter insertion loss and out-of-band suppression, which can be obtained by simulation design in advance.

[0025] In an embodiment, the alloy inner core 3 and the input end 5 and the output end 6 are detachably connected.

[0026] Specifically, in the embodiment, the alloy inner core 3 and the input end 5 and the alloy inner core 3 and the output end 6 are connected through a spiral thread and a pin, and the inner conductor pin is embedded into the insertion hole at the end of the alloy inner core by tightening the SMA joint.

[0027] It should be noted that the simple device formed by the simulation design of the series cylindrical conductors in the embodiment can control the filter insertion loss and out-of-band suppression by replacing the alloy inner core 3 of different designs, so that the filter is easy to produce, assemble and debug.

[0028] In an embodiment, the conductors at the head and tail of the alloy inner core 3 are fixed to the inner wall of the filter cavity through the insulating pads 4 respectively, and the insulating pads 4 are made of polytetrafluoroethylene.

[0029] In an embodiment, the filter cavity includes a first cavity 1 and a second cavity 2, and the first cavity 1 and the second cavity 2 are connected through threads, which is convenient for assembly and disassembly.

[0030] In an embodiment, the joint of the input end 5 and the joint of the output end 6 adopt one of SMA, N and DIN.

[0031] Specifically, the joint in the embodiment is preferably a double SMA joint to reduce the volume of the filter.

[0032] In an embodiment, the filter wall cavity is made of copper.

[0033] In the embodiment, the entire filter structure is processed by copper material, which is very stable and reliable.

[0034] The low-temperature cavity filter provided by the embodiment can work below the liquid helium temperature zone, adopts a replaceable alloy inner core 3 with a suitable dielectric constant and high matching as the main body of the filter, and the cavity internal filter assembly can effectively filter out the noise in the transmission path.

[0035] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0037] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above-mentioned embodiments within the scope of the present application.

Claims

1. A cryogenic cavity filter, characterized by, The filter comprises an input end, an output end, a filter cavity and an alloy inner core, two ends of the alloy inner core are fixed to the inner wall of the filter cavity through insulating gaskets, the input end and the output end are arranged on two sides of the filter cavity and connected with the alloy inner core, and the alloy inner core is a series alloy structure formed by a plurality of conductor units connected in series.

2. The cryogenic cavity filter of claim 1, wherein, The alloy inner core is prepared from red copper.

3. The cryogenic cavity filter of claim 1, wherein, The conductor is in a cylindrical shape.

4. The cryogenic cavity filter of claim 1, wherein, The alloy inner core and the input end and the output end are detachably connected.

5. The cryogenic cavity filter of claim 1, wherein, The conductor at the head and tail of the alloy inner core is fixed to the inner wall of the filter cavity through the insulating gaskets.

6. The cryogenic cavity filter of claim 1, wherein, The filter cavity comprises a first cavity and a second cavity, and the first cavity and the second cavity are connected through threads.

7. The cryogenic cavity filter of claim 1, wherein, The joint of the input end and the joint of the output end adopt one of SMA, N and DIN.

8. The cryogenic cavity filter of claim 1, wherein, The insulating gaskets are prepared from polytetrafluoroethylene.

9. The cryogenic cavity filter of claim 1, wherein, The filter wall cavity is prepared from copper processing.

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