An antenna adjustment system based on cryogenic spiral resonator

Abstract

The invention discloses an antenna adjustment system based on a low-temperature spiral resonator, comprising: a vacuum box, a spiral resonator, a radio frequency load, a heat conductor, and a mechanical spiral feedthrough. The vacuum box has an inner cavity. The spiral resonator is arranged in the inner cavity of the vacuum box, and the spiral resonator comprises a resonator body, a transmitting antenna arranged in the resonator body, and a receiving antenna arranged in the resonator body. The transmitting antenna is movably connected to the resonator body; the transmitting antenna is connected to an alternating power line. The heat conductor extends from the outside of the vacuum box into the inner cavity of the vacuum box, and the heat conductor connects the spiral resonator and the radio frequency load. The inner rotating shaft is connected to a conversion mechanism, and the transmitting antenna is installed on the conversion mechanism; the conversion mechanism can drive the transmitting antenna to be relatively close to or away from the receiving antenna when it is linked by the inner rotating shaft. It can match the power supply impedance with the load impedance in a vacuum environment without destroying the low temperature, the adjustment process will not damage the vacuum device, and the adjustment accuracy is high.

Description

Technical Field

[0001] The present invention relates to the field of resonator technology, and in particular to an antenna adjustment system based on a low-temperature spiral resonator. Background Art

[0002] For a normally working RF load, in order to prevent the RF signal reflection from causing damage to the device, it is necessary to add an impedance matching device to make the load impedance match the power supply impedance. In a room temperature environment, this is very easy to achieve. You only need to calculate the matching impedance requirements, and then make the corresponding matching device and connect it in front of the load to make the load impedance match the power supply impedance.

[0003] Traditional spiral resonators or PCB integrated resonators can be adjusted at room temperature so that the load impedance matches the power supply impedance. However, some types of RF loads perform better when working in a low-temperature vacuum environment. However, when the RF load is placed in a low-temperature vacuum environment, the load impedance will change due to the change in conductivity and material shrinkage caused by the low temperature, which is not easy to quantitatively predict; this results in the impedance matching done well at room temperature, and when working in a low-temperature vacuum environment, it needs to be readjusted according to the actual situation.

[0004] If impedance needs to be re-matched, it is often necessary to restore the low-temperature vacuum environment to the room temperature environment of natural atmospheric pressure, and then re-establish the low-temperature vacuum environment after adjustment. This is very time-consuming in actual operation, thus reducing work efficiency, and there is a high probability that the sealing of the vacuum device will be compromised. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an antenna adjustment system based on a low-temperature spiral resonator, which can match the power supply impedance with the load impedance in a vacuum environment without destroying the low temperature. The adjustment process will not damage the vacuum device and the adjustment accuracy is high.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] An antenna adjustment system based on a cryogenic spiral resonator, comprising:

[0008] A vacuum box having an inner cavity;

[0009] A spiral resonator is arranged in the inner cavity of the vacuum box, and the spiral resonator includes a resonator body, a transmitting antenna arranged on the resonator body, and a receiving antenna arranged on the resonator body; the transmitting antenna is movably connected to the resonator body so that the relative distance between the transmitting antenna and the receiving antenna can be adjusted; the transmitting antenna is connected to an alternating power line, and the power supply end of the alternating power line passes through the outside of the vacuum box;

[0010] A radio frequency load is connected to the receiving antenna; the radio frequency load is arranged in the inner cavity of the vacuum box; the radio frequency load is connected to a DC power line; the power supply end of the DC power line extends out of the vacuum box;

[0011] A heat conducting member extending from outside the vacuum box into the inner cavity of the vacuum box, wherein a portion of the heat conducting member located outside the vacuum box is used to connect to an external cold source, and a portion of the heat conducting member located inside the vacuum box is used to connect the spiral resonator and the RF load through heat conduction;

[0012] A mechanical spiral feedthrough is installed in the vacuum box, an inner rotating shaft of the mechanical spiral feedthrough is located in the vacuum box, the inner rotating shaft is transmission-connected with a conversion mechanism, and the transmitting antenna is installed on the conversion mechanism; when the conversion mechanism is linked by the inner rotating shaft, it can drive the transmitting antenna to be relatively close to or away from the receiving antenna.

[0013] Furthermore, the vacuum box also has an outer cavity, which surrounds the periphery of the inner cavity and is separated from the inner cavity by a heat insulation layer.

[0014] Furthermore, the heat insulation layer is made of copper material.

[0015] Furthermore, the portion of the vacuum box enclosing the outer cavity is made of stainless steel or aluminum.

[0016] Furthermore, the heat insulation layer has a vent hole to enable the inner cavity to communicate with the outer cavity.

[0017] Furthermore, the mechanical spiral feedthrough is sealedly connected to the vacuum box via a first flange.

[0018] Furthermore, the alternating power line is sealedly connected to the vacuum box via a second flange.

[0019] Furthermore, the DC power line is sealed and connected to the vacuum box via a third flange.

[0020] Furthermore, the conversion mechanism includes a sleeve having an internal thread; the resonator body is provided with a non-circular guide hole, and the sleeve is movably inserted into the non-circular guide hole; the inner shaft has an external thread and is inserted into the non-circular guide hole so that the external thread cooperates with the internal thread; the transmitting antenna or the receiving antenna is installed on the sleeve.

[0021] Furthermore, the heat conducting member comprises a plurality of tubes arranged at intervals, the spiral resonator is thermally connected to the plurality of tubes, and the radio frequency load is thermally connected to the plurality of tubes.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] By utilizing the combination of a mechanical spiral feedthrough and a conversion mechanism, the impedance value of the mechanical spiral feedthrough can be adjusted in a low-temperature vacuum environment without destroying the low temperature and without introducing thermal radiation interference, thereby matching the impedance of the RF load with the impedance of the alternating power supply of the alternating power line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an antenna adjustment system based on a cryogenic spiral resonator of the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of point A.

[0026] In the figure: 1, vacuum box; 11, inner cavity; 12, outer cavity; 2, spiral resonator; 21, resonator body; 211, non-circular guide hole; 22, transmitting antenna; 23, receiving antenna; 24, alternating power line; 3, RF load; 31, DC power line; 4, heat conductor; 41, tube body; 42, heat conductor; 5, cold source; 6, mechanical spiral feedthrough; 61, inner shaft; 611, external thread; 7, conversion mechanism; 71, sleeve; 711, internal thread; 8, thermal insulation layer; 91, first flange; 92, second flange; 93, third flange. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element, or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element, or there may be an element centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Figure 1-Figure 2An antenna adjustment system based on a low-temperature spiral resonator 2 according to a preferred embodiment of the present invention is shown, including a vacuum box 1, a spiral resonator 2, a radio frequency load 3, a heat conductor 4, a cold source 5, and a mechanical spiral feedthrough 6.

[0031] The vacuum box 1 has an inner cavity 11 and an outer cavity 12. The outer cavity 12 surrounds the periphery of the inner cavity 11 and is separated from the inner cavity 11 by a heat insulating layer 8. The purpose of providing the outer cavity 12 is to prevent the heat radiation outside the vacuum box 1 from being transferred to the inner cavity 11, so that the inner cavity 11 can maintain a low temperature or ultra-low temperature as much as possible under the action of the cold source 5. In other words, adding the outer cavity 12 is a preferred setting, but not the only way. In this way, in the case where the outer cavity 12 is not added, the inner cavity 11 will serve as the only cavity of the vacuum box 1 that can easily accommodate other components; of course, in this embodiment, when some circuits or components pass through the outer cavity 12 from the vacuum box 1 directly to the inner cavity 11, part of their structure is accommodated in the outer cavity 12.

[0032] The spiral resonator 2 is arranged in the inner cavity 11 of the vacuum box 1. The spiral resonator 2 includes a resonator body 21, a transmitting antenna 22 arranged on the resonator body 21, and a receiving antenna 23 arranged on the resonator body 21. It can be understood that the spiral resonator 2 is installed in the inner cavity 11 (based on the fact that the RF load 3 is preferably in a vacuum and ultra-low temperature condition, that is, the spiral resonator 2 must be arranged in the inner cavity 11 or the outer cavity 12 to act on the RF load 3). The transmitting antenna 22 is movably connected to the resonator body 21 so that the relative distance between the transmitting antenna 22 and the receiving antenna 23 can be adjusted, that is, the basic condition for the adjustable spacing between the transmitting antenna 22 and the receiving antenna 23 is provided. The transmitting antenna 22 is connected to an alternating power line 24, and the power supply end of the alternating power line 24 passes through the outside of the vacuum box 1 to connect to the alternating power supply; if necessary, the RF load 3 is connected to the receiving antenna 23. In this way, under the action of the current of the alternating power line 24, according to the working principle of the existing spiral resonator 2, when the transmitting antenna 22 is supplied with an alternating current, the receiving antenna 23 can induce a current to provide an alternating current to the RF load 3, so that the components on the RF load 3 that need to be connected to the alternating current can work. Simultaneously, a technical problem of mismatch between the load impedance and the power supply impedance also arises. Therefore, it is necessary to adjust the distance between the transmitting antenna 22 and the receiving antenna 23 without interference in the inner cavity 11 at a low temperature and in a near-vacuum state, so as to change the coupling degree between the transmitting antenna 22 and the receiving antenna 23, and then improve the impedance value of the spiral resonator 2, that is, to make the impedance value of the alternating power supply of the alternating power line 24 in a low temperature and vacuum environment match the impedance value of the RF load 3.

[0033] According to the above description, in order to improve the performance of the RF load 3, the RF load 3 is arranged in the inner cavity 11 of the vacuum box 1 to make it perform better during operation. The RF load 3 is connected to a DC power line 31, and the power supply end of the DC power line 31 is extended to the outside of the vacuum box 1 to connect to a DC power source; thus, the DC power line 31 can not only enable the components on the RF load 3 that need to be connected to a linear current to work, but also provide DC bias for protection.

[0034] The heat conductor 4 extends from the outside of the vacuum box 1 into the inner cavity 11 of the vacuum box 1. The portion of the heat conductor 4 located outside the vacuum box 1 is used to connect to the cold source 5, and the portion of the heat conductor 4 located inside the vacuum box 1 is heat-conductingly connected to the spiral resonator 2 and the RF load 3. In this way, the heat conductor 4 transfers the heat of the spiral resonator 2 and the RF load 3 to the cold source 5 by physical contact, so that the spiral resonator 2 and the RF load 3 are in a low temperature state to meet the requirements of working performance.

[0035] Importantly, the mechanical spiral feedthrough 6 is installed in the vacuum box 1, and the inner shaft 61 of the mechanical spiral feedthrough 6 is located in the vacuum box 1, so that the environment of the inner shaft 61, the environment of the spiral resonator 2 and the environment of the RF load 3 are all the same, so that the adjustment process will not be affected by the external temperature. The inner shaft 61 is connected to the conversion mechanism 7 in a transmission manner, and the transmitting antenna 22 is installed on the conversion mechanism 7; when the conversion mechanism 7 is linked by the inner shaft 61, it can drive the transmitting antenna 22 to approach or move away from the receiving antenna 23. According to the working principle of the mechanical spiral feedthrough 6, its outer shaft acts on the inner shaft 61 through a magnetic fluid. Since the magnetic fluid is not affected by temperature, when the magnetic fluid drives the inner shaft 61 to rotate, it will not cause the temperature of the inner cavity 11 to rise. Then, the rotational motion of the inner shaft 61 is converted into linear motion by the conversion mechanism 7, so that the transmitting antenna 22 is driven relatively close to or away from the receiving antenna 23. In this way, by utilizing the combination of the mechanical spiral feedthrough 6 and the conversion mechanism 7, the impedance value of the mechanical spiral feedthrough 6 can be adjusted without destroying the low-temperature vacuum environment and without introducing thermal radiation interference, so that the impedance of the RF load 3 matches the impedance of the alternating power supply of the alternating power line 24.

[0036] The working principle is: the alternating power supply supplies power to the alternating power supply line 24, and the current flows from the alternating power supply → the alternating power supply line 24 → the transmitting antenna 22 → the induced current → the receiving antenna 23 → the RF load 3. The direct current power supply supplies power to the direct current power supply line 31, and the current flows from the direct current power supply → the direct current power supply line 31 → the RF load 3. Based on this, when it is necessary to adjust so that the impedance of the alternating power supply matches the impedance of the RF load 3, the rotational motion of the inner rotating shaft 61 of the mechanical spiral feedthrough 6 is linked to the conversion mechanism 7 to output a linear motion, so that the transmitting antenna 22 installed on the conversion mechanism 7 is close to or away from the receiving antenna 23 (similarly, the receiving antenna 23 can also be installed on the conversion mechanism 7, and the transmitting antenna 22 is in a stationary state relative to the vacuum box 1, as long as the two are relatively close or relatively far away), thereby changing the impedance of the spiral resonator 2, and finally making the impedance of the alternating power supply match the impedance of the RF load 3.

[0037] In order to better block the heat radiation from the external environment, the heat insulation layer 8 is made of copper material. Also, the part of the vacuum box 1 surrounding the outer cavity 12 is made of stainless steel or aluminum material.

[0038] In order to simultaneously complete the vacuuming of the inner cavity 11 and the outer cavity 12 in one operation, preferably, the heat insulating layer 8 has a vent hole to connect the inner cavity 11 and the outer cavity 12. In other words, the inner cavity 11 and the outer cavity 12 can also be isolated from each other, but they need to be vacuumed separately.

[0039] The mechanical spiral feedthrough 6 is sealedly connected to the vacuum box 1 via the first flange 91 .

[0040] The alternating power line 24 is sealedly connected to the vacuum box 1 via the second flange 92 .

[0041] The DC power line 31 is sealed and connected to the vacuum box 1 via the third flange 93 .

[0042] Preferably, the conversion mechanism 7 includes a sleeve 71, and the sleeve 71 has an internal thread 711; the resonator body 21 is provided with a non-circular guide hole 211, and the sleeve 71 is movably inserted into the non-circular guide hole 211. The inner shaft 61 has an external thread 611 and is inserted into the non-circular guide hole 211 so that the external thread 611 cooperates with the internal thread 711. The transmitting antenna 22 or the receiving antenna 23 is installed on the sleeve 71. In this way, when the inner shaft 61 rotates, the sleeve 71 cannot rotate in the non-circular guide hole 211, and is forced to move along the axial direction of the non-circular guide hole 211, thereby linking the transmitting antenna 22 or the receiving antenna 23, so that the transmitting antenna 22 and the receiving antenna 23 are close to each other or away from each other. In this embodiment, it is obvious that the transmitting antenna 22 is installed on the sleeve 71, and the receiving antenna 23 is installed on the resonator body 21. It should be noted that, as an alternative, there are many alternative ways to set the conversion structure, for example, by installing a first gear on the inner shaft 61, and then the first gear is moved by a gear group linked to a rack, and then the rack is linked to the transmitting antenna 22. There are too many alternative ways to list, so they will not be expanded here.

[0043] Preferably, the inner cavity 11 and the outer cavity 12 are close to vacuum, that is, the heat transfer fluid medium in the vacuum box 1 is relatively thin. However, it is still possible to conduct heat radiation. Therefore, in order to make the cooling effect of the heat conductor 4 higher, the heat conductor 4 includes a plurality of tubes 41 arranged at intervals, the spiral resonator 2 is thermally connected to the plurality of tubes 41, and the RF load 3 is thermally connected to the plurality of tubes 41. In this way, the heated area is expanded, thereby improving the cooling efficiency. In addition, in order to facilitate the connection of the tube 41 with the external cold source 5, the cold source 5 is connected to the tube 41 through the heat conductor 42.

[0044] It should be noted that the cold source 5, the alternating current power source and the direct current power source can be provided by the system itself or by the external environment. In addition, the radio frequency load of the present invention can be a blade-shaped ion trap and a very high frequency receiver, etc.

[0045] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An antenna adjustment system based on a cryogenic spiral resonator, It is characterized in that include: A vacuum box (1) having an inner cavity (11); A helical resonator (2) is arranged in an inner cavity (11) of a vacuum box (1), the helical resonator (2) comprising a resonator body (21), a transmitting antenna (22) arranged on the resonator body (21), and a receiving antenna (23) arranged on the resonator body (21); the transmitting antenna (22) is movably connected to the resonator body (21) so as to be able to adjust the relative distance between the transmitting antenna (22) and the receiving antenna (23); the transmitting antenna (22) is connected to an alternating power line (24), and the power supply end of the alternating power line (24) is extended out of the vacuum box (1); A radio frequency load (3) connected to the receiving antenna (23); the radio frequency load (3) is arranged in the inner cavity (11) of the vacuum box (1); A heat conducting member (4) extends from outside the vacuum box (1) into an inner cavity (11) of the vacuum box (1); a portion of the heat conducting member (4) located outside the vacuum box (1) is used to connect to an external cold source (5); and a portion of the heat conducting member (4) located inside the vacuum box (1) is heat-conductingly connected to the helical resonator (2) and the radio frequency load (3); A mechanical spiral feedthrough (6) is installed in the vacuum box (1); an inner rotating shaft (61) of the mechanical spiral feedthrough (6) is located in the vacuum box (1); the inner rotating shaft (61) is drivingly connected to a conversion mechanism (7); the transmitting antenna (22) is installed on the conversion mechanism (7); when the conversion mechanism (7) is linked by the inner rotating shaft (61), it can drive the transmitting antenna (22) to be relatively close to or away from the receiving antenna (23).

2. An antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 1, It is characterized in that The vacuum box (1) further comprises an outer cavity (12), which surrounds the periphery of the inner cavity (11) and is separated from the inner cavity (11) by a heat insulation layer (8).

3. An antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 2, It is characterized in that The heat insulation layer (8) is made of copper material.

4. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 2, It is characterized in that The portion of the vacuum box (1) enclosing the outer cavity (12) is made of stainless steel or aluminum.

5. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 2, It is characterized in that The heat insulating layer (8) has ventilation holes to allow the inner cavity (11) to communicate with the outer cavity (12).

6. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 1, It is characterized in that The mechanical spiral feedthrough (6) is sealedly connected to the vacuum box (1) via a first flange (91).

7. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 1, It is characterized in that The alternating power line (24) is sealedly connected to the vacuum box (1) via a second flange (92).

8. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 1, It is characterized in that The radio frequency load (3) is connected to a DC power line (31); the power supply end of the DC power line (31) extends out of the vacuum box (1); and the DC power line (31) is sealed and connected to the vacuum box (1) via a third flange (93).

9. The antenna adjustment system based on a cryogenic spiral resonator as claimed in claim 1, It is characterized in that The conversion mechanism (7) comprises a sleeve (71), and the sleeve (71) has an internal thread (711); the resonator body (21) is provided with a non-circular guide hole (211), and the sleeve (71) is movably inserted into the non-circular guide hole (211); the inner shaft (61) has an external thread (611) and is inserted into the non-circular guide hole (211) so that the external thread (611) cooperates with the internal thread (711); the transmitting antenna (22) or the receiving antenna (23) is installed on the sleeve (71).

10. The antenna adjustment system based on the cryogenic spiral resonator as claimed in claim 1, It is characterized in that The heat conducting member (4) comprises a plurality of tubes (41) arranged at intervals, the spiral resonator (2) is heat-conductingly connected to the plurality of tubes (41), and the radio frequency load (3) is heat-conductingly connected to the plurality of tubes (41).

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