Radio frequency attenuator

Abstract

The utility model discloses a radio frequency attenuator, which comprises a shell, a first coil, a second coil, a third coil and a fourth coil, the resistance rod is fixed in the cavity; the radio frequency connector is arranged at the upper end of the shell, and a conductive contact part of the radio frequency connector is arranged at the upper end hole of the upper end; the signal output connector is arranged on the side wall of the shell and is in conductive contact with the side part of the resistance rod; the resistor further comprises an elastic conductive upper connecting piece, the upper end of the upper connecting piece penetrates through the upper end hole to abut against the conductive contact part, and the lower end of the upper connecting piece is connected to the upper end of the resistor rod in a sleeved mode. The resistor rod has the advantages of firm, reliable and excellent conductive contact between the resistor rod and the radio frequency connector.

Description

Technical Field

[0001] This utility model belongs to the field of attenuator technology, and particularly relates to an radio frequency attenuator. Background Technology

[0002] In the field of microwave radio frequency, a radio frequency attenuator is an energy-consuming component that reduces the power of the input radio frequency signal before transmitting it.

[0003] An RF attenuator typically consists of a housing, a resistor rod housed within a cavity of the housing, an RF connector connected to one end of the housing, and a signal output connector located on the side of the housing. The end of the resistor rod needs to make a conductive connection with the conductive contact portion of the RF connector. The resistor rod is usually made of ceramic. Since both the ceramic resistor and the conductive contact portion of the RF connector are made of rigid materials, existing RF attenuators suffer from weak or poor conductive contact. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an RF attenuator with a firm and reliable contact between the resistor rod and the conductive contact part of the RF connector and excellent conductive contact, so as to overcome the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An RF attenuator, comprising:

[0007] A housing having a cavity inside;

[0008] The resistance rod is fixed inside the cavity;

[0009] An RF connector is mounted on the upper end of the housing, and the conductive contact portion of the RF connector is located at the upper end hole at the upper end.

[0010] A signal output connector is mounted on the side wall of the housing and makes conductive contact with the side of the resistor rod;

[0011] The feature is that it further includes an elastically conductive upper connector, the upper end of which passes through the upper end hole and abuts against the conductive contact portion, and the lower end of the upper connector is sleeved on the upper end of the resistance rod.

[0012] By incorporating an elastic conductive upper connector between the conductive contact portion and the resistor rod of the RF connector, the upper connector achieves an elastic connection between the conductive contact portion and the resistor rod, ensuring a firm and reliable conductive contact with excellent conductivity.

[0013] In this invention, a support member is fixed inside the cavity at the position corresponding to the upper connector to support the upper connector. Adding the support member strengthens and securely fixes the upper connector and the upper end of the conductive rod.

[0014] In this invention, an elastically insulated lower connector is provided within the cavity between the lower end of the resistance rod and the shell. This structure ensures that both the upper and lower ends of the conductive rod are in elastic contact, further guaranteeing a firm, reliable, and excellent conductive contact.

[0015] In this invention, the resistance rod is a ceramic resistance rod, the shell is made of aluminum, the upper connector is made of beryllium copper or tin phosphor bronze, and the support and the lower connector are made of insulating engineering plastic.

[0016] In this invention, the resistance rod has a hollow liquid channel inside, the upper connector has a hollow cavity communicating with the hollow liquid channel, the side of the upper connector has a through hole communicating with the hollow cavity, the lower connector has a hollow flow channel communicating with the hollow liquid channel, the lower end of the housing is connected to a liquid inlet connector communicating with the hollow flow channel, and the side of the housing near the lower end has a liquid outlet connector communicating with the hollow cavity. Thus, by introducing coolant into the liquid inlet connector, the coolant flows through the hollow liquid channel of the resistance rod to cool the resistance rod internally, and then through the cavity to cool the resistance rod externally, thereby removing the heat generated during the operation of the resistance rod, and finally exiting from the liquid outlet connector. After being cooled externally, the discharged coolant flows back into the resistance rod from the liquid inlet connector, thus circulating continuously to remove the heat generated by the resistance rod. It ensures that the operating temperature of the resistance rod is controlled within a low variation range (less than 60℃), reducing the power capacity and performance changes caused by the temperature rise of the resistance film on the resistance rod. It effectively avoids the attenuation accuracy fluctuation caused by resistance changes during long-term high-power operation. It features small footprint, low noise, long service life, and high reliability.

[0017] In this invention, the cavity is a conical cavity that is larger at the top and smaller at the bottom. This cavity structure has the advantage of impedance matching. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0020] Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Detailed Implementation

[0021] like Figure 1 As shown, the liquid-cooled attenuation module of this utility model includes a housing 100, a resistor rod 200, an upper connector 300, a lower connector 400, an RF connector 500, and a support 600.

[0022] The housing 100 is made of aluminum and consists of an upper cover 110, a main body 120, and a lower cover 130 connected together, with a sealing ring between them, forming an internal cavity 140. Specifically, the upper cover 110 is fixed to the top opening of the main body 110 by screws. A sealing ring seals the top opening of the upper cover 110 and the main body 110. The upper cover 110 has an upper hole 111 at its center. The lower cover 130 is fixed to the bottom opening of the main body 110 by screws. A sealing ring seals the bottom opening of the lower cover 130 and the main body 110. The lower cover 130 has a lower hole 131 at its center. The RF connector 500 is fixed to the outer end face of the upper cover 110 by screws, and the conductive contact portion 501 is located precisely at the upper hole 111. A sealing ring also seals the RF connector 500 and the outer end face of the upper cover 110.

[0023] The resistance rod 200 is a ceramic resistor and is disposed within the cavity 140. The resistance rod 200 has a tubular structure with hollow liquid channels 201 open at both ends inside. The surface of the resistance rod 200 has a resistive film 202.

[0024] The upper connector 300 is an elastic conductive connector, specifically made of an elastic conductive metal, such as beryllium copper or tin-phosphor bronze. One end of the upper connector 300 is a closed end 301, and the other end is an open end 302. The interior is a hollow cavity 303, and through holes 304 are distributed circumferentially on the side. The closed end 301 of the upper connector 300 abuts against the conductive contact portion 501 of the RF connector 500, and the open end 302 is fitted onto the upper end of the resistor rod 200.

[0025] The lower connector 400 is an elastically insulated connector, specifically made of insulating engineering plastic, such as modified polyphenylene sulfide. The lower connector 400 has a hollow flow channel 401 with openings at both ends. The lower end of the lower connector 400 is positioned at the edge of the lower end hole 131 of the lower end cover 130, and its upper end face abuts against the lower end of the resistance rod 200. A sealing gasket 402 is also provided between the two.

[0026] Because the upper connector 300 and the lower connector 400 have a certain degree of elasticity, the upper and lower ends of the resistor rod 200 can be reliably connected to the RF connector 500 and the lower end cover 130 respectively within the housing 100. This overcomes the problems of unreliable connection and poor contact caused by direct rigid contact between the two ends of the resistor rod 300 and the RF connector 500 and the lower end cover 130 respectively. Furthermore, the upper connector 300 is made of conductive metal, allowing the signal input to the RF connector 500 to be conducted to the resistor rod via the upper connector 300. The lower connector 400 is made of insulating engineering plastic, preventing the resistor rod from leaking signals out through the lower end cover 130.

[0027] To ensure the stability of the upper connector 300, a support member 600 is provided inside the cavity 140. This insulated support member 600 is also made of insulating engineering plastic, such as modified polyphenylene sulfide. The support member 600 has a central hole 601 that is fixedly supported around the upper connector 300, and its outer edge is positioned at the top opening edge of the main body 110 and pressed and fixed by the upper end cap 110. The support member 600 divides the cavity 140 into an upper cavity 141 and a lower cavity 142. Holes 602 connecting the upper cavity 141 and the lower cavity 142 are also distributed around the upper connector 300 on the support member 600. The through hole 304 of the upper connector 300 is located corresponding to the upper cavity 141.

[0028] A signal output connector 800 is sealed and installed on the signal lead-out hole on the side of the main body 110. The signal output connector 800 is electrically connected to the side of the resistor rod 200.

[0029] A liquid inlet connector 701 is threaded onto the lower center hole 131 of the lower end cover 130. A side hole is also connected to the side of the main body 110 near the lower end cover 130, and a liquid outlet connector 702 is threaded onto this side hole. Thus, the liquid inlet connector 701, the hollow flow channel 401 of the lower connector 400, the hollow liquid channel 201 of the resistance rod 200, the hollow cavity 303 of the upper connector 300, the through hole 304, the upper cavity 141, the perforation 602, the lower cavity 142, and the liquid outlet connector 702 sequentially form a coolant channel. The coolant entering through the liquid inlet connector 701 cools the resistance rod internally through the hollow liquid channel 201, then cools it externally through the cavity 140, thus removing the heat generated during the operation of the resistance rod, and finally exits through the liquid outlet connector 702. After being drained and cooled externally, the coolant flows back into the resistance rod 200 through the inlet connector 701, thus circulating continuously and carrying away the heat generated by the resistance rod 200. This ensures that the operating temperature of the resistance rod is controlled within a low variation range (less than 60°C), reducing power capacity and performance changes caused by the temperature rise of the resistive film on the resistance rod 200. It effectively avoids the attenuation and accuracy fluctuations caused by resistance changes during long-term high-power operation, and features small footprint, low noise, long service life, and high reliability.

[0030] In this invention, the resistance distribution of the resistance rod 200 is a T-type attenuation network or a π-type attenuation network.

[0031] In this invention, the coolant should be insulating; therefore, the coolant is pure water, or a mixture of pure water and ethylene glycol. Adding ethylene glycol to pure water allows for operation in low-temperature environments, and the coolant will not freeze even at -20°C.

[0032] Furthermore, the cavity of this invention is a conical cavity, with a larger upper end near the RF connector 500 and a smaller lower end near the liquid inlet connector 701. That is, the cavity gradually decreases in size from the end near the RF connector 500 to the end near the liquid inlet connector 701. This cavity structure has the advantage of impedance matching.

Claims

1. A radio frequency attenuator, comprising: A housing having a cavity inside; The resistance rod is fixed inside the cavity; An RF connector is mounted on the upper end of the housing, and the conductive contact portion of the RF connector is located at the upper end hole at the upper end. A signal output connector is mounted on the side wall of the housing and makes conductive contact with the side of the resistor rod; The feature is that it further includes an elastically conductive upper connector, the upper end of which passes through the upper end hole and abuts against the conductive contact portion, and the lower end of the upper connector is sleeved on the upper end of the resistance rod.

2. The radio frequency attenuator according to claim 1, characterized in that, Inside the cavity, at the position corresponding to the upper connector, there is also a support member that supports the upper connector.

3. The radio frequency attenuator according to claim 2, characterized in that, An elastically insulated lower connector is also provided inside the cavity between the lower end of the resistance rod and the shell.

4. The radio frequency attenuator according to claim 3, characterized in that: The resistance rod is a ceramic resistance rod.

5. The radio frequency attenuator according to claim 3, characterized in that: The housing is made of aluminum, the upper connector is made of beryllium copper or tin phosphor bronze, and the support and the lower connector are made of insulating engineering plastic.

6. The radio frequency attenuator according to claim 3, characterized in that: The resistance rod has a hollow liquid channel inside, the upper connector has a hollow cavity communicating with the hollow liquid channel, the side of the upper connector has a through hole communicating with the hollow cavity, the lower connector has a hollow flow channel communicating with the hollow liquid channel, the lower end of the housing is connected to a liquid inlet connector communicating with the hollow flow channel, and the side of the housing near the lower end has a liquid outlet connector communicating with the hollow cavity.

7. The radio frequency attenuator according to claim 6, characterized in that: The support member divides the cavity into an upper cavity and a lower cavity, and the support member has a hollow section that connects the upper cavity and the lower cavity.

8. The radio frequency attenuator according to claim 2, characterized in that: The housing is composed of an upper end cover, a main body, and a lower end cover connected in sequence. The support member has a central hole in the middle that is fixedly supported on the periphery of the upper connector. Its outer edge is positioned at the top opening edge of the main body and is pressed and fixed by the upper end cover.

9. The radio frequency attenuator according to claim 1, characterized in that: The resistance distribution of the resistance rod is a T-type attenuation network or a π-type attenuation network.

10. The radio frequency attenuator according to claim 1, characterized in that: The cavity is a cone-shaped cavity that is larger at the top and smaller at the bottom.

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