A radio frequency coaxial connector socket with improved discharge threshold

Abstract

The present invention discloses a radio frequency coaxial connector socket for improving the discharge threshold, comprising an outer conductor, an insulating medium, an inner conductor, and an air vent. A jack matching the radio frequency coaxial connection plug is provided at one end of the inner conductor of the connector; an external thread is provided at the other end of the inner conductor of the connector, and the external thread is used to connect the inner conductor of an external device, and the air vent connects the jack and the blind cavity of the inner conductor of the external device; the jack and the radio frequency coaxial connector plug are non-sealed plugs. When the present invention is used as an interconnection interface, the inner conductor is threadedly connected to the inner conductor of the external device through an external thread, and after the connection, the gas in the blind cavity is transmitted to the connector jack through the air vent, thereby achieving exhaust. For high-power satellite-borne microwave equipment, the air vent avoids the low pressure and gas molecule environment in the blind cavity, greatly improves the discharge threshold at the blind cavity, and effectively ensures the stable and reliable operation of the equipment on orbit.

Description

Technical Field

[0001] The invention relates to a radio frequency coaxial connector socket, which is a radio frequency coaxial connector socket with improved discharge threshold, and can be applied to large power aerospace-grade radio frequency coaxial connector socket models such as N, TNC, and SC. Background Art

[0002] With the rapid development of electronic equipment, many electronic devices need to use RF coaxial connector sockets, which include outer conductors, inner conductors, and insulating media. The inner conductor is fixed on the insulating medium, and the insulating medium is fixed inside the outer conductor. RF coaxial connector sockets have the advantages of small size, wide bandwidth, superior mechanical and electrical performance, and high reliability. They are widely used as interconnection interfaces between circuit boards, RF modules, circuit boards, and RF modules, and between devices.

[0003] When used as an interconnection interface, a certain length of external thread is generally set on the inner conductor of the RF coaxial connector socket, marked with M, such as M2, M3 and other screws; correspondingly, an internal thread of a corresponding length is set on the inner conductor of the circuit board, RF module or device, such as M2, M3 and other screw holes. Due to mechanical processing, the internal thread has a blind cavity, see Figure 2 After the two are threadedly connected, there is residual gas in the blind cavity, which is not easy to discharge. For high-power satellite-borne microwave equipment working in orbit, the residual gas in the blind cavity is discharged through the threads in the equipment to form a local low pressure and an environment containing gas molecules. At this time, the discharge threshold of the equipment is low, and low-pressure discharge is prone to occur, which can cause partial or complete reflection of the channel power. In severe cases, it may even cause permanent damage to the components and loss of the channel's working ability. Summary of the invention

[0004] The technical problem solved by the present invention is: for high-power satellite-borne microwave equipment working in orbit, the external thread of the inner conductor of the RF coaxial connector socket is connected to the internal thread of the inner conductor with a blind cavity. After the connection, the residual gas in the blind cavity is not easy to discharge, the discharge threshold is low, and low-pressure discharge is prone to occur. The present application discloses an RF coaxial connector socket with an improved discharge threshold.

[0005] The technical solution for this application is:

[0006] A radio frequency coaxial connector socket with improved discharge threshold, comprising

[0007] Outer conductor;

[0008] Insulating medium, connected to the outer conductor;

[0009] The inner conductor is connected to the insulating medium. One end of the inner conductor is provided with a socket matching the RF coaxial connector plug. The other end of the inner conductor is provided with an external thread for connecting to the inner conductor of an external device. The inner conductor is provided with at least one air hole, which connects the socket and the blind cavity of the inner conductor of the external device.

[0010] The length of the external thread is based on ensuring reliable thread connection.

[0011] The jack and the radio frequency coaxial connector plug are connected in a non-sealed manner.

[0012] According to the principle of skin effect, high-frequency electromagnetic waves only exist on the surface of the inner conductor. In engineering, skin depth δ (or penetration depth) is often used to characterize the skin degree of electromagnetic waves, which is defined as the distance the electromagnetic wave propagates when the amplitude of the electromagnetic wave decays to the surface value (i.e. 36.8%).

[0013]

[0014] Among them, f is the frequency of the electromagnetic wave, μ is the magnetic permeability, and σ is the electrical conductivity.

[0015] The design parameters such as the depth and diameter of the ventilation holes are based on not affecting the rigidity strength of the conductor in the RF coaxial connector socket and the transmission of electromagnetic signals.

[0016] The vent hole design meets the following conditions:

[0017] (1) The vent hole is a cylindrical hole. The axis of the vent hole is parallel to the axis of the inner conductor. The cylindrical hole is convenient for engineering implementation.

[0018] (2) The vent holes are arranged in a cylinder with a diameter of D-2δ, centered on the central axis of the inner conductor, where D is the diameter of the inner conductor and δ is the skin depth (or penetration depth) of the electromagnetic wave, to ensure that the vent holes do not affect the electromagnetic field distribution in the RF coaxial connector socket, that is, do not affect the transmission of electromagnetic signals.

[0019] (3) The total area of ​​the vent holes A, the diameter of the vent holes d, the depth of the vent holes s and the volume of the blind cavity V must satisfy the following relationship:

[0020] A / V>1.7×10 -6 / mm

[0021] s / d>6.25.

[0022] To ensure that the air pressure inside the blind cavity can quickly balance with the external air pressure during the process of entering the vacuum environment. The total area of ​​the air hole A is the cross-sectional area of ​​the air hole perpendicular to its own axis; the depth of the air hole s is the dimension along the axis of the air hole.

[0023] (4) The roughness of the inner wall of the vent hole is Ra≤1.6 μm. If the inner wall of the vent hole is rough or even has burrs, discharge may occur when it falls off near the connector jack, which will offset the benefit of increasing the discharge threshold brought by adding vent holes.

[0024] (5) The air holes cannot affect the rigidity and strength of the inner conductor.

[0025] Preferably, at least two vent holes are provided. With this number of vent holes, the connector socket has higher reliability when used in satellite-borne equipment and the like.

[0026] When the RF coaxial connector socket is used as an interconnection interface of a circuit board, RF module or device, the outer thread of the inner conductor is connected to the inner thread of the inner conductor with a blind cavity. After the connection, the gas in the blind cavity is transmitted to the jack through the air vent, and the jack and the RF coaxial connector plug are non-sealed, thereby achieving exhaust.

[0027] In summary, this application at least includes the following beneficial technical effects:

[0028] (1) The present invention provides a vent hole in a designated area that does not affect the rigidity and strength of the conductor in the RF coaxial connector socket and the transmission of electromagnetic signals, thereby discharging the residual gas in the blind cavity after the threaded connection, thereby avoiding the occurrence of local low pressure and an environment containing gas molecules in high-power satellite-borne microwave equipment, greatly improving the discharge threshold at the blind cavity, and effectively ensuring the stable and reliable operation of the equipment on orbit.

[0029] (2) Compared with the traditional RF coaxial connector socket, the present invention only sets more ventilation holes in the designated area, with few modifications, simple and reasonable settings, low cost, good stability, strong applicability, good practicality, and suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a cross-sectional view of a connector socket in an embodiment of the present invention;

[0031] Figure 2 It is a cross-sectional view of the inner conductor with a blind cavity;

[0032] Figure 3 is a cross-sectional view of the structure after the connector socket and the inner conductor with a blind cavity are threadedly connected in an embodiment of the present invention;

[0033] Figure 4 It is a simulation curve of low-pressure discharge threshold in a blind cavity without air holes;

[0034] Figure 5 It is a simulation curve of micro-discharge threshold in a blind cavity with air holes.

[0035] Description of reference numerals: 1. outer conductor; 2. insulating medium; 3. inner conductor; 4. vent hole; 5. jack; 6. external thread;

[0036] 7. Inner conductor of external device; 71. Internal thread; 72. Blind cavity. DETAILED DESCRIPTION

[0037] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and it should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention.

[0038] The present application embodiment discloses a radio frequency coaxial connector socket with improved discharge threshold, which is an interconnection interface of L-band 2000W satellite-borne microwave equipment. Figure 1 As shown, the connector socket includes an outer conductor 1, an insulating medium 2, and an inner conductor 3. The insulating medium 2 is fixed in the outer conductor 1, and the inner conductor 3 is fixed in the insulating medium 2. A jack 5 is provided at one end of the inner conductor 3, and the jack 5 is matched with the RF coaxial connector plug; an external thread 6 is provided at the other end of the inner conductor 3, and the external thread 6 is matched with the external thread of the inner conductor of the external device. The inner conductor 3 is provided with at least one air vent, and the air vent communicates with the blind cavity of the jack and the inner conductor of the external device.

[0039] In this embodiment, the outer conductor 1 is made of beryllium copper; the insulating medium 2 is made of polytetrafluoroethylene; the inner conductor 3 is made of beryllium copper plated with gold, and the thickness of the gold plating is 2.5 um; the external thread 6 is an M4 screw, and the thread length L is 7 mm.

[0040] The skin tendency of L-band electromagnetic waves on gold is

[0041]

[0042] Where f is the frequency of the electromagnetic wave.

[0043] In this embodiment, the vent hole 4 meets the following conditions:

[0044] (1) The air vent 4 is a cylindrical hole.

[0045] (2) The air hole 4 is arranged along the central axis of the inner conductor, with a diameter of d = 0.8 mm. The air hole is arranged in a cylinder with a diameter of D-2δ = 4 mm-5 um = 3.995 mm, centered on the central axis of the inner conductor (D is the diameter of the inner conductor, δ is the skin depth (or penetration depth) of the electromagnetic wave), thereby ensuring that the air hole 4 does not affect the electromagnetic field distribution in the RF coaxial connector socket, that is, does not affect the transmission of electromagnetic signals.

[0046] (3) Total vent area A = 0.5 mm 2, vent diameter d = 0.8mm, vent depth s = 11mm and blind cavity volume V ≈ 19mm 3 The following relations are satisfied:

[0047] A / V>1.7×10 -6 / mm

[0048] s / d>6.25

[0049] This ensures that when entering the vacuum environment, the air pressure inside the blind cavity can quickly balance with the external air pressure.

[0050] (4) The inner wall roughness of the air hole 4 is Ra = 1.6 μm.

[0051] (5) The air holes 4 do not affect the rigidity and strength of the inner conductor.

[0052] The RF coaxial connector socket is used as the interconnection interface of the L-band 2000W satellite-borne microwave equipment. The external thread 6 of the inner conductor is connected to the internal thread of the inner conductor of the external device with a blind cavity. After the connection, the gas in the blind cavity is transmitted to the jack 5 through the air vent 4. The jack 5 and the RF coaxial connector pin are non-sealed, so the gas can be discharged from the jack 5, thereby achieving exhaust.

[0053] The discharge threshold at the blind cavity before and after the present invention is adopted is simulated, and the simulation results are as follows: Figure 4 , Figure 5 shown. Figure 4 In the case where the air hole 4 is not provided, for high-power satellite-borne microwave equipment, due to the local low pressure and the environment containing gas molecules in the blind cavity when working on orbit, low-pressure discharge will occur in the blind cavity during operation. Figure 4 It can be seen that the low-pressure discharge threshold is less than 500W. Figure 5 This is the case where the vent hole 4 is set in this embodiment. At this time, for high-power satellite-borne microwave equipment, when entering the vacuum environment, the residual gas in the blind cavity can be discharged through the vent hole 4, and the air pressure inside the blind cavity can quickly balance with the external air pressure, that is, a vacuum environment is quickly formed in the blind cavity to avoid low-pressure discharge during on-orbit operation. The micro-discharge threshold simulation of the blind cavity of this embodiment is performed, and the simulation results are as follows: Figure 5 As shown, Figure 5 The power corresponding to the different numbered curves is different, and it can be seen that the micro-discharge threshold at the blind cavity is 10375W. Figure 4 and Figure 5 By comparing the devices with and without the air vent 4, the present invention avoids low-pressure discharge by setting air vents in the connector socket, increases the discharge threshold from 500W to 10375W, and effectively ensures stable and reliable operation of the equipment on track.

[0054] The implementation principle of this application is: by setting a vent hole 4 in the inner conductor 3, the vent hole 4 connects the jack 5 and the blind cavity 72 of the inner conductor of the external device. When the connector socket of this application is connected to the inner conductor 7 of the external device, the inner conductor 3 is connected to the inner conductor thread of the external device through the external thread. After the connection, the gas in the blind cavity 72 is transmitted to the jack 5 of the connector through the vent hole 4, thereby achieving exhaust. For high-power satellite-borne microwave equipment, the vent hole avoids the low pressure and gas molecule environment in the blind cavity, greatly improves the discharge threshold at the blind cavity, and effectively ensures the stable and reliable operation of the equipment on orbit.

[0055] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A radio frequency coaxial connector socket with improved discharge threshold, characterized in that: include An outer conductor (1); An insulating medium (2) connected to the outer conductor (1); An inner conductor (3) is connected to an insulating medium (2); a socket (5) matching a radio frequency coaxial connector plug is provided at one end of the inner conductor (3); an outer thread (6) for connecting to an inner conductor (7) of an external device is provided at the other end of the inner conductor (3); and at least one air hole (4) is provided on the inner conductor (3); the air hole (4) communicates with the socket (5) and a blind cavity (72) of the inner conductor (7) of the external device; The vent holes (4) are arranged in a cylinder with a central axis of the inner conductor (3) as the center and a diameter of D-2δ, where D is the diameter of the inner conductor (3) and δ is the skin depth of the electromagnetic wave; The total area A of the vent holes (4), the diameter d of the vent holes (4), the depth s of the vent holes (4) and the volume V of the blind cavity (72) satisfy the following relationship: A / V>1.7×10 -6 / mm, s / d>6.25; The inner wall roughness of the vent hole (4) is Ra≦1.6 μm; At least two vent holes (4) are provided.

2. The radio frequency coaxial connector socket for improving the discharge threshold according to claim 1, characterized in that: The jack (5) and the radio frequency coaxial connector plug are connected in a non-sealed manner.

3. The radio frequency coaxial connector socket with improved discharge threshold according to claim 1, characterized in that: The air vent (4) is a cylindrical hole.

4. The radio frequency coaxial connector socket for improving the discharge threshold according to claim 1, characterized in that: Said , Among them, f is the frequency of the electromagnetic wave, μ is the magnetic permeability, and σ is the electrical conductivity.

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