WO2023082125A1

WO2023082125A1 - Resonant cavity, rubidium clock and communication apparatus

Info

Publication number: WO2023082125A1
Application number: PCT/CN2021/129983
Authority: WO
Inventors: 李�真; 梁丹
Original assignee: 上海华为技术有限公司
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2023-05-19

Abstract

Provided is a resonant cavity (400), comprising a cavity body (410), at least one rubidium bubble (420) and at least two media (431, 432). The rubidium bubble (420) and the at least two media (431, 432) are all provided in the cavity body (410), and two sides of the rubidium bubble (420) are respectively provided with at least one medium (431, 432) among the at least two media (431, 432). The distribution of a magnetic field is changed by means of media (431, 432), such that the intensity of the magnetic field is strong at a center and strong on an edge; and when the resonant cavity (400) is applied to the rubidium clock, atomic transition in the rubidium clock is improved, thereby improving the clock precision of the rubidium clock.

Description

A resonant cavity, rubidium clock and communication device

technical field

The present application relates to the field of communication, in particular to a resonant cavity, a rubidium clock and a communication device.

Background technique

In the future wireless communication 5.5 generation communication technology (the 5.5 ^th generation, 5.5G) user-centric wireless access (user centric no cell radio access, UCNC) technology, it is necessary to achieve high-precision coordination between base stations , puts forward ultra-high-precision requirements for the technical indicators of the clock, that is, the precision of the clock is expected to reach 1E-12 (scientific notation, that is, on the order of 1×10 ^-12 ).

Among them, the rubidium atomic clock (hereinafter referred to as the rubidium clock) is the direction of realizing high-precision clocks between the base stations of the future wireless communication 5.5G. The miniaturization and performance of rubidium clocks are critical to achieving high-accuracy clocks between base stations. However, the accuracy of the current rubidium clock has reached the level of 5E-11 (that is, 5×10 ^-11 , equivalent to 50*10 ^-12 ), which is still 50 times away from the target accuracy (1E-12). To achieve the technical index of the target accuracy, the performance of the rubidium clock needs to be further improved.

Contents of the invention

The application provides a resonant cavity, a rubidium clock and a communication device for improving the performance of the rubidium clock.

The first aspect of the present application provides a resonant cavity, including a cavity, at least one rubidium bubble, and at least two media. Among them, the rubidium bubble and at least 2 media are arranged in the cavity, and at least 1 medium of at least 2 media is arranged on both sides of the rubidium bubble, and the distribution of the magnetic field is changed through the medium, so that the strength of the magnetic field is strong in the center and weak at the edge , when the resonant cavity is applied to the rubidium clock, the atomic transition in the rubidium clock is improved, and the clock accuracy of the rubidium clock is improved.

In some feasible implementation manners, the cavity is in the shape of a cuboid, and compared with a cavity in the shape of a cylinder, its height is reduced, which improves commercial feasibility.

In some feasible implementation manners, the at least one rubidium bubble is two rubidium bubbles, namely a first rubidium bubble and a second rubidium bubble, wherein the first rubidium bubble is an absorbing bubble, and the second rubidium bubble is an absorption bubble. The bubble is a filter bubble, and the first rubidium bubble and the second rubidium bubble are not in contact and placed on the same horizontal plane. By dividing one rubidium bubble into two rubidium bubbles, the two rubidium bubbles can be manufactured by different manufacturers. Make it more adaptable to manufacture. Moreover, the second rubidium bubble is used as a filter bubble, and the first rubidium bubble is used as an absorbing bubble. Compared with only one rubidium bubble, its performance is better.

In some feasible implementation manners, the at least one rubidium bubble is in the shape of a cuboid, so that it can be conveniently arranged on the cavity in the shape of a cuboid.

In some feasible implementation manners, the at least 2 media include 4 media; the at least 1 medium with the at least 2 media respectively arranged on both sides of the rubidium bubble includes: at least 4 media are respectively arranged on both sides of the rubidium bubble 2 of the 4 media mentioned above. By arranging multiple media, the uniformity of the magnetic field is further improved.

In some feasible implementation manners, at least one of the at least two mediums is grounded, or at least one medium is not grounded. If the medium is grounded, the magnetic field distribution is more uniform.

In some feasible implementation manners, the materials of the at least two media are ceramics, which have better performance.

In some feasible implementation manners, at least one of the at least two media is configured with a cylinder, the cylinder is placed vertically, and the cylinder is used to adjust the resonant frequency on the corresponding medium. Through the adjustment of the cylinder, multiple media can make the magnetic field more uniform, ensuring that the strength of the magnetic field is strong at the center and strong at the edge.

In some feasible implementation manners, the resonant cavity further includes a photocell, and the photocell is arranged in the cavity and placed on the same horizontal plane as the rubidium bubble. The photovoltaic cell 440 is a semiconductor element that generates electromotive force under the irradiation of light, and has the functions of photoelectric conversion, photodetection, and light energy utilization.

In some feasible implementation manners, the resonant cavity further includes a feed point, and the feed point is arranged on the side or bottom of the cavity. The feed point is used to introduce the external power supply, so that the resonant cavity 400 is formed here. In some possible implementations, the feed point is short-circuited or open-circuited.

In some feasible implementation manners, the feed point is a short-circuit type or an open-circuit type.

The second aspect of the present application provides a rubidium clock, including a plurality of resonant cavities as described in various implementation manners in the first aspect.

The third aspect of the present application is a communication device, including a processor and a transceiver, and the rubidium clock as described in the second aspect is built in the transceiver.

The technical solution provided by the embodiments of the present application provides a resonant cavity, including a cavity, at least one rubidium bubble, and at least two media. Among them, the rubidium bubble and at least 2 media are arranged in the cavity, and at least 1 medium of at least 2 media is arranged on both sides of the rubidium bubble, and the distribution of the magnetic field is changed through the medium, so that the intensity of the magnetic field is strong in the center and strong at the edge , when the resonant cavity is applied in the rubidium clock, the atomic transition in the rubidium clock is improved, and the clock accuracy of the rubidium clock is improved.

Description of drawings

Fig. 1 is the product illustration figure of a kind of rubidium clock of the present application;

Fig. 2 is the sectional view of the resonant cavity of rubidium clock;

Fig. 3 is the three-dimensional view of the resonant cavity of rubidium clock;

Figure 4-1 is a top view of the resonant cavity of the present application;

Figure 4-2 is a cross-section comparison diagram of a cuboid and a cylinder in the cavity of the present application;

Figure 4-3 is a top view of a resonant cavity of the present application;

Fig. 4-4 is the top view of the resonant cavity of the present application;

Fig. 4-5 is the top view of the resonant cavity of the present application;

Fig. 4-6 is the top view of the resonant cavity of the present application;

4-7 are perspective views of the resonant cavity of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

The technical solutions of the embodiments of the present application can be applied to rubidium clocks in various data processing communication systems, such as code division multiple access (code division multiple access, CDMA), time division multiple access (time division multiple access, TDMA), frequency division Multiple access (frequency division multiple access, FDMA), orthogonal frequency division multiple access (orthogonal frequency-division multiple access, OFDMA), single carrier frequency division multiple access (single carrier FDMA, SC-FDMA) and long term evolution (long termevolution, New radio (NR) system in the fifth generation (5th generation, 5G) mobile communication system of LTE) system and massive multiple-input multiple-output (massive multiple-input multiple-output, Massive MIMO) system and other systems rubidium clock in.

The term "system" can be used interchangeably with "network". The CDMA system can implement wireless technologies such as universal terrestrial radio access (UTRA), CDMA2000, and the like. UTRA may include wideband CDMA (wideband CDMA, WCDMA) technology and other CDMA variant technologies. CDMA2000 can cover interim standard (interim standard, IS) 2000 (IS-2000), IS-95 and IS-856 standards. A TDMA system may implement a wireless technology such as global system for mobile communication (GSM). OFDMA system can implement such as evolved universal wireless terrestrial access (evolved UTRA, E-UTRA), ultra mobile broadband (umb), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA and other wireless technologies. UTRA and E-UTRA are UMTS and UMTS evolutions. 3GPP in long term evolution (long term evolution, LTE) and various versions based on LTE evolution are new versions of UMTS using E-UTRA.

In addition, the communication system may also be applicable to future-oriented communication technologies, all of which are applicable to the technical solutions provided in the embodiments of the present application. The system architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. For the evolution of architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

In the future wireless communication 5.5 generation communication technology (the 5.5 ^th generation, 5.5G) user-centric wireless access (user centric no cell radio access, UCNC) technology, it is necessary to achieve high-precision coordination between base stations , the ultra-high-precision requirements are put forward for the technical indicators of the clock, that is, the precision of the clock is expected to reach the order of 1E-12 (scientific notation, that is, 1*10^(-12)).

Among them, the rubidium atomic clock (hereinafter referred to as the rubidium clock) is the direction of realizing high-precision clocks between the base stations of the future wireless communication 5.5G. Please refer to Figure 1, which is an example diagram of a rubidium clock product. The miniaturization and performance of rubidium clocks are critical to achieving high-accuracy clocks between base stations. However, the accuracy of the current rubidium clock has reached the level of 5E-11 (that is, 5*10^(-11), equivalent to 50*10^(-12)), which is still 50 times away from the target accuracy (1E-12). To achieve the technical index of the target accuracy, the performance of the rubidium clock needs to be further improved. In addition, due to the slot limitation in the baseband unit (BBU) of the base station, the current rubidium clock needs to occupy 3 slots in the BBU, so the rubidium clock cannot be directly used in the base station at present. The key component for improving performance and reducing size is the resonant cavity in the rubidium clock. The optimization of the resonant cavity can improve the output clock performance of the rubidium clock while reducing the overall height of the rubidium clock.

At present, the built-in resonator of rubidium clock usually uses the resonator of TE11 mode, and there is no medium inside. As shown in Figure 2, it is a section view of the resonant cavity of the rubidium clock. The built-in resonant cavity of the current rubidium clock includes a cavity and a rubidium bubble, wherein the cavity is a cylinder with a diameter of 22 millimeters (mm). As shown in Figure 3, it is a perspective view of the resonant cavity of the rubidium clock. Since the resonant cavity is placed horizontally, its height is also 22mm. Among them, the photocell of the rubidium clock is placed in the resonant cavity as the bottom of the cylinder. Among them, the direction of the internal magnetic field of the resonant cavity is a helical structure, the magnetic field strength is strong at the edge, weak in the middle, and poor in uniformity.

There are many defects in the above-mentioned resonant cavity. First of all, limited by the wavelength corresponding to the 6.8GHz frequency band of the resonant magnetic field, the diameter of the resonant cavity in TE11 mode needs to be 22mm, resulting in too high a cavity height, which needs to occupy 3 slots of the BBU, making it difficult to commercialize. In addition, because the magnetic field strength of the resonant cavity is strong at the edge and weak at the center, that is, the uniformity of the magnetic field is poor, which is not conducive to the atomic transition in the rubidium clock. Moreover, the magnetic field strength of the resonant cavity is relatively poor, ranging from 1.7 to 4.2A/m. Furthermore, the magnetic field direction of the resonant cavity is not parallel to the axial direction, as shown in FIG. 1 or FIG. 2 , part of the magnetic field traces is perpendicular to the axial direction. These defects not only affect the commercial use of rubidium clocks, but also affect the stability of the output clock by affecting the signal-to-noise ratio of atomic transitions.

For this reason, a kind of resonant cavity is proposed in this application, comprises cavity body, at least 1 rubidium bubble and at least 2 mediums, wherein, rubidium bubble and at least 2 mediums are all arranged in the cavity, and the two sides of rubidium bubble are respectively at least Set at least 1 medium of at least 2 mediums. Since the rubidium bubble and at least 2 media are arranged in the cavity, and at least 1 medium of at least 2 media is arranged on both sides of the rubidium bubble, the distribution of the magnetic field is changed through the medium, so that the strength of the magnetic field is strong at the center and strong at the edge. When the resonant cavity is applied to the rubidium clock, the atomic transition in the rubidium clock is improved, and the clock accuracy of the rubidium clock is improved.

Exemplarily, please refer to FIG. 4-1, which is a top view of a resonant cavity 400 proposed in this application, including a cavity 410, a rubidium bubble 420 and two media, namely a first dielectric 431 and a second dielectric 432 . Wherein, the rubidium bubble 420 and the two media are both arranged in the cavity 410 , and the first medium 431 and the second medium 432 are respectively arranged on both sides of the rubidium bubble 420 .

The cavity 410 , at least one rubidium bubble 420 and at least two media in the embodiments of the present application will be described in detail below in conjunction with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

1. Cavity 410 .

1. Shape.

In some feasible implementation manners, the cavity 410 may be cylindrical, semi-cylindrical, prismatic (such as trapezoidal, cuboid), etc., which is not limited here. Exemplarily, as shown in Figure 4-2, the cavity 410 is in the shape of a cuboid. When at least one rubidium bubble 420 is placed in the cavity 410, compared with the cylindrical or semi-cylindrical cavity 410, the cavity in the shape of a cuboid The body 410 can effectively reduce the height and improve its commercial feasibility.

2. Material.

In the embodiment of the present application, the cavity 410 is used to accommodate at least one rubidium bubble 420 and at least two media. In some feasible implementation manners, the material of the cavity 410 may be metal (such as ink-repellent alloy or aluminum alloy), or metal plated on the outside of ceramics for shielding the magnetic field, which is not limited here.

2. At least one rubidium bubble 420.

1. Shape.

In some feasible implementation manners, at least one rubidium cell 420 may be a cylinder placed horizontally, or may be a cuboid or other shapes, which are not limited here. It should be noted that, as shown in Figure 4-2, when the cavity is a cuboid, at least one rubidium bubble 420 can be in the shape of a cuboid, making the volume smaller, and the rubidium bubble 420 can be placed on the cavity 410 more conveniently.

2. Location.

In some feasible implementation manners, when at least one rubidium bubble 420 is placed in the cavity 410, a certain space can be reserved on both sides for placing at least one of the at least two media respectively.

3. Material.

In some feasible implementation manners, at least one rubidium bubble is made of a glass body and has a built-in rubidium metal.

4. Quantity.

In some feasible implementation manners, at least one rubidium bubble can be 1, 2 or more rubidium bubbles. As shown in Fig. 4-1, at least one rubidium bubble 420 is one rubidium bubble. As shown in Figure 4-3, at least one rubidium bubble 420 is two rubidium bubbles, respectively a first rubidium bubble 421 and a second rubidium bubble 422, wherein the first rubidium bubble and the second rubidium bubble have no contact and placed relative to the same horizontal plane.

In some feasible implementations, the first rubidium cell is an absorbing cell, and the second rubidium cell is a filter cell. Among them, the first rubidium bubble is used to filter the a-line of light, and the second rubidium bubble is used to absorb the b-line of light to make atomic transitions occur.

Three, at least 2 media.

1. Shape.

In some feasible implementation manners, at least two media may be cylinders placed horizontally, or rectangular parallelepipeds or other shapes, which are not limited here. It should be noted that, as shown in FIG. 4-1 , when the cavity is a cuboid, at least two media can be in the shape of a cuboid, which is more conveniently placed on the cavity 410 .

2. Material.

In some feasible implementation manners, the materials of the at least two media can be ceramics, or metals, polymer materials, or other materials, and the materials are determined according to the dielectric constant, which is not limited here. When at least two media are made of ceramics, the performance is better.

3. Quantity

In some feasible implementation manners, as shown in FIG. 4-1 or FIG. 4-3 , the at least two media can be two media, respectively arranged on both sides of at least one rubidium bubble, with one media on each side. The medium can change the distribution of the magnetic field to make the magnetic field more uniform, so that the strength of the magnetic field is stronger at the center and stronger at the edge. When the resonant cavity is applied to the rubidium clock, the atomic transition in the rubidium clock is improved, and the clock based on the rubidium clock is improved. precision. It should be noted that the distance between the two media and the at least one rubidium bubble is equal or the distance is not obvious, and the quality of the two media is the same or the distance is not obvious, so that the medium can make the magnetic field more uniform and ensure that the strength of the magnetic field is strong in the center. Edge strong.

In some feasible implementations, as shown in FIG. 4-4, which is a top view of the resonant cavity 400, the at least 2 mediums can be 4 mediums, which are respectively arranged on both sides of at least one rubidium bubble, with 2 mediums on one side, One side of one rubidium bubble is a medium. Through the four media, the distribution of the magnetic field is further changed to make the magnetic field more uniform, and the strength of the magnetic field is further strengthened at the center and stronger at the edge. When the resonant cavity is applied to the rubidium clock, the atomic transition in the rubidium clock is improved, and the Clock accuracy in rubidium clocks. It should be noted that the distances between the four media and the at least one rubidium bubble are equal or the distance is not obvious, and the quality of the two media on one side is the same or the distance is not obvious, so that the media can make the magnetic field more uniform and ensure The strength of the magnetic field is stronger at the center and stronger at the edges. Alternatively, the sum of the mass of the two media on one side is the same as or not significantly different from the sum of the mass of the two media on the other side, so that the media can make the magnetic field more uniform and ensure that the magnetic field is strong at the center and strong at the edge.

In some feasible implementations, other settings can be used to make the medium on both sides of at least one rubidium bubble 420 have the same influence on the magnetic field, so that the medium changes the distribution of the magnetic field. The strength of the magnetic field is strong at the center and strong at the edge. When changed to When the resonant cavity is applied to the rubidium clock, the atomic transition in the rubidium clock is improved, and the clock accuracy of the rubidium clock is improved.

For example, as shown in Figure 4-5, the at least 2 mediums can be 3 mediums, which are respectively arranged on both sides of the rubidium bubble, wherein one side has 1 medium, and the other side has 2 mediums, wherein the mass of 1 medium on one side The sum of the mass of the two media on the other side is equal or the difference is not obvious, and the distance between the three media and the at least one rubidium bubble is equal or the difference is not obvious, so that the medium can make the magnetic field more uniform and ensure that the strength of the magnetic field is in the center Strong, with strong edges.

In some feasible implementations, the at least 2 media can be 5, 6, 8... media, which are not limited here, when the at least 2 media are respectively arranged on both sides of the rubidium bubble, so that multiple media can be Make the magnetic field more uniform, and ensure that the strength of the magnetic field is strong in the center and strong at the edge.

In some feasible implementation manners, take the at least 2 media as 4 media, and the at least 1 rubidium bubble 420 as 2 rubidium bubbles as an example. As shown in Fig. 4-6, it is a top view of the resonant cavity 400. Through four media, the magnetic field is more uniform, and the strength of the magnetic field is guaranteed to be strong at the center and strong at the edge.

4. Grounding.

In some feasible implementation manners, at least one of the at least two mediums is grounded, or at least one medium is not grounded. It should be noted that the grounding means that when the cavity 410 is placed on the ground, the medium is connected to the cavity 410 by metal. If the medium is grounded, the magnetic field distribution is more uniform. If the medium is not grounded, the manufacture is more convenient, the feasibility is higher, and the possibility of commercial use is higher.

5. Configure the cylinder.

In some feasible implementation manners, at least one of the at least two media is configured with a cylinder, the cylinder is placed vertically, and the cylinder is used to adjust the resonant frequency on the corresponding medium. As shown in Figure 4-6, it is a perspective view of the resonant cavity 400, the at least 2 mediums are 4 mediums, and each medium is equipped with vertically placed cylinders, and these cylinders are used to adjust the resonant frequency on the corresponding medium . Through the adjustment of the cylinder, multiple media can make the magnetic field more uniform, ensuring that the strength of the magnetic field is strong at the center and strong at the edge.

Fourth, photocells and feed points.

In some feasible implementations, as shown in FIGS. 4-7 , the resonant cavity 400 further includes a photocell 440 , and the photocell 440 can be placed in the cavity 410 and placed on the same level as at least one rubidium bubble 420 . It should be noted that the photovoltaic cell 440 is a semiconductor element that generates electromotive force under the irradiation of light, and has the functions of photoelectric conversion, photodetection, and light energy utilization.

In some feasible implementation manners, the resonant cavity 400 further includes a feed point, and the feed point is arranged on the side or bottom of the cavity. It should be noted that the feed point is used to introduce the external power supply, so that the resonant cavity 400 is formed here. In some possible implementations, the feed point is short-circuited or open-circuited.

In the embodiment of the present application, a rubidium clock is also proposed, which has multiple resonant cavities 400 as described above built in.

The following example illustrates. If the cavity 410 of the resonant cavity 400 is a cuboid, there are two rubidium bubbles, one of which is an absorbing bubble and the other is a filter bubble. There is a ceramic medium on both sides of each rubidium bubble, and there are 4 mediums in total. Through the simulation experiment, the technical effect comparison between the current technical solution shown in Table 1 and the technical solution of the present application can be achieved:

Table 1

In summary, when the resonant cavity 400 is applied to a rubidium clock, the technical solution of the present application achieves the following technical effects compared with the current technical solution:

1. Reduce the height of the resonant cavity 400, for example, the height of the resonant cavity 400 is reduced from 22 mm to 12 mm, thereby reducing the height of the rubidium clock, that is, the whole machine of the rubidium clock can be reduced from 32 mm to 22 mm.

2. The signal-to-noise ratio of the rubidium clock is increased by 3-5dB, and its stability is increased by 2-3 times.

3. Solve the clock coordination of UCNC and improve the clock accuracy of rubidium clock.

An embodiment of the present application further provides a communication device, wherein the communication device includes the rubidium clock as described in the foregoing embodiments. It should be understood that the communication device provided in the embodiment of the present application can achieve the same technical effect as the above-mentioned dielectric rubidium clock. For details, reference may be made to the relevant description of the above-mentioned embodiment, and details are not repeated here. Optionally, the communication device may be a terminal device or a network device, etc., which is not limited here.

The terminal equipment in the embodiment of the present application may be called a terminal (terminal), user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT) and so on. Terminal equipment can be mobile phone, tablet computer (Pad), computer with wireless transceiver function, virtual reality (virtual reality, VR) terminal equipment, augmented reality (augmented reality, AR) terminal equipment, industrial control (industrial control) ), wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal device.

The network device in the embodiment of the present application is an access device for a terminal device to access the mobile communication system through wireless means, and may be a base station NodeB, an evolved base station (evolved NodeB, eNB), a transmission reception point (transmission reception point, TRP), the next generation NodeB (gNB) in the 5G mobile communication system, the base station in the future mobile communication system or the access node in the WiFi system, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.

In this embodiment of the present application, a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application. For example, the execution body of the method provided by the embodiment of this application may be a wireless access network device or a terminal device, or a functional module in a terminal device or an access network device that can call a program and execute the program .

In addition, it should be noted that the device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be A physical unit can be located in one place, or it can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided in the present application, the connection relationship between the modules indicates that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines.

Claims

A resonant cavity is characterized in that, comprising:

Cavity, at least 1 rubidium bubble and at least 2 media;

Both the rubidium bubble and the at least 2 media are arranged in the cavity;

At least one medium of the at least two mediums is respectively arranged on both sides of the rubidium bubble.
The resonant cavity according to claim 1, wherein the cavity is in the shape of a cuboid.
The resonant cavity according to claim 1 or 2, wherein said at least one rubidium bubble comprises 2 rubidium bubbles, which are respectively a first rubidium bubble and a second rubidium bubble, wherein said first rubidium bubble is an absorbing The second rubidium bubble is a light filter bubble, and the first rubidium bubble and the second rubidium bubble are not in contact and placed on the same horizontal plane.
The resonant cavity according to any one of claims 1-3, characterized in that, the at least one rubidium bubble is in the shape of a cuboid.
The resonant cavity according to any one of claims 1-4, wherein the at least 2 mediums include 4 mediums;

The two sides of the rubidium bubble are respectively provided with at least one medium of the at least two mediums including:

At least two of the four media are arranged on both sides of the rubidium bubble.
The resonant cavity according to any one of claims 1-5, wherein at least one of the at least two mediums is grounded, or at least one medium is not grounded.
The resonant cavity according to any one of claims 1-6, characterized in that the material of the at least two mediums is ceramics.
According to any one of claims 1-7, the resonance cavity is characterized in that at least one of the at least two media is provided with a cylinder, the cylinder is placed vertically, and the cylinder is used to adjust the corresponding The resonant frequency of the medium.
The resonant cavity according to any one of claims 1-8, further comprising a photocell, the photocell is arranged in the cavity and placed on the same horizontal plane as the rubidium bubble.
The resonant cavity according to any one of claims 1-9, further comprising a feed point, the feed point is arranged on the side or bottom of the cavity.
The resonant cavity according to claim 10, characterized in that, the feeding point is a short-circuit type or an open-circuit type.
A rubidium clock, characterized in that it comprises a plurality of resonant cavities according to any one of claims 1-11.
A communication device, characterized by comprising a processor and a transceiver, wherein the rubidium clock according to claim 12 is built in the transceiver.