CN112151926B

CN112151926B - Novel direct current isolation precision load

Info

Publication number: CN112151926B
Application number: CN202011021906.3A
Authority: CN
Inventors: 王怀念; 汪贤兵; 李兴坤; 孙景奇
Original assignee: Guangdong Guochang Technology Co ltd
Current assignee: Guangdong Guochang Technology Co ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2022-03-11
Anticipated expiration: 2040-09-25
Also published as: CN112151926A

Abstract

The invention discloses a novel direct current isolation precision load, which comprises a shell, a central conductor, a capacitor and a resistor, wherein the central conductor is arranged in the shell; the central conductor is connected with the capacitor, the capacitor and the shell form an inductor, the capacitor and the resistor are connected in series and grounded, capacitors with different specifications are selected according to requirements, direct current signals are effectively isolated, a radio frequency terminal load and the coaxial direct current DC isolator are integrated, functions of the coaxial direct current DC isolator are integrated, installation space is reduced, and manufacturing cost is reduced.

Description

Novel direct current isolation precision load

Technical Field

The invention relates to the technical field of microwave communication, in particular to a novel direct-current isolation precision load.

Background

The main function of the coaxial load is to fully absorb microwave energy from the transmission line, thereby improving the matching performance of the circuit. The radio frequency coaxial load is widely applied to wireless equipment, electronic instruments and various microwave equipment, impedance matching is carried out on the vacant standby channel and the test port, signal impedance matching is guaranteed, and meanwhile signal leakage of the vacant port and mutual interference among systems are greatly reduced.

The coaxial DC isolator has the main functions of intervening in a transmission line to isolate the influence of a DC power supply signal on equipment or a test instrument, realizing the transmission of microwave signals and the isolation of DC signals and avoiding the equipment or the instrument from being damaged by DC current.

With the progress of science and technology, more and more signals need to be processed by microwave devices, radio frequency coaxial terminal loads and coaxial DC isolators are applied to various military and civil equipment more and more widely, and meanwhile, the requirements of the equipment on the electrical properties of the radio frequency coaxial loads and the DC isolators are higher and higher (within a frequency band as wide as possible, the equipment has the best electrical properties, and has excellent reliability and anti-interference performance in a severe use environment). The design adopted conventionally is to use independent load and DC isolator in the equipment, and the design has certain limitation in the times of miniaturization, high precision and low cost of the equipment.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a novel DC isolation precision load is provided.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a novel accurate load is kept apart to direct current, includes the shell, locates central conductor in the shell, with the electric capacity that central conductor connects and with electric capacity series connection ground connection's resistance, the electric capacity with the shell forms the inductance.

The invention has the beneficial effects that: the central conductor is connected with the capacitor, the capacitor and the shell form an inductor, the capacitor and the resistor are connected in series and grounded, capacitors with different specifications are selected according to requirements, direct current signals are effectively isolated, a radio frequency terminal load and the coaxial direct current DC isolator are integrated, functions of the coaxial direct current DC isolator are integrated, installation space is reduced, and manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic circuit diagram of a novel dc isolation precision load according to a first embodiment of the present invention;

fig. 2 is a partial cross-sectional view of a novel dc isolated precision load according to a first embodiment of the present invention;

fig. 3 is an exploded view of a novel dc isolated precision load according to a first embodiment of the present invention;

fig. 4 is a comparison diagram of design simulation data and actual test data of the novel dc isolated precision load according to the first embodiment of the present invention.

Description of reference numerals:

1. a housing; 2. a center conductor; 3. a waterproof ring; 4. a clamp spring; 5. a first insulating medium; 6. an outer conductor; 7. a label; 8. a resistance; 9. a capacitor; 10. a circuit board; 11. a second insulating medium.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

The most key concept of the invention is as follows: the radio frequency terminal load and the coaxial direct current DC blocking device are integrated.

Referring to fig. 1 to 4, a novel dc isolation precision load includes a housing 1, a central conductor 2 disposed in the housing 1, a capacitor 9 connected to the central conductor 2, and a resistor 8 connected in series with the capacitor 9 and grounded, where the capacitor 9 and the housing 1 form an inductor.

From the above description, the beneficial effects of the present invention are: the central conductor 2 is connected with the capacitor 9, the capacitor 9 and the shell 1 form an inductor, the capacitor 9 and the resistor 8 are connected in series and grounded, capacitors 9 with different specifications are selected according to requirements, effective isolation of direct current signals is achieved, a radio frequency terminal load and a coaxial direct current DC isolator are integrated, functions of the coaxial direct current DC isolator are integrated, installation space is reduced, and manufacturing cost is reduced.

Further, the cable further comprises an outer conductor 6, the shell 1 is sleeved on the outer conductor 6, and the central conductor 2, the capacitor 9 and the resistor 8 are respectively arranged in the outer conductor 6.

As can be seen from the above description, the outer conductor 6 is used to conduct the housing 1 and the capacitor 9, so as to ensure that an inductance is formed between the capacitor 9 and the housing 1.

Further, the coaxial cable further comprises a first insulating medium 5 sleeved on the central conductor 2, one end of the central conductor 2 is exposed out of the first insulating medium 5, and a second insulating medium 11 is arranged at one end, far away from the first insulating medium 5, in the outer conductor 6.

As can be seen from the above description, the first insulating medium 5 and the second insulating medium 11 facilitate forming a protection and isolation function on the central conductor 2, the capacitor 9, and the resistor 8, and enhance the stability of the present novel dc isolation precision load functional performance.

Further, a step surface for installing the capacitor 9 and the resistor 8 is further formed in the outer conductor 6.

As is apparent from the above description, the step surface ensures that the capacitor 9 and the resistor 8 are more firmly mounted in the outer conductor 6.

Furthermore, a clamp spring 4 connected with the shell 1 is further arranged on the outer conductor 6.

It can be known from the above description that the jump ring 4 can be effectively to the shell 1 carries out spacingly, has reduced the shell 1 with the risk that outer conductor 6 breaks away from does benefit to structural stability's reinforcing.

Further, a sealing member is further disposed on the outer conductor 6.

Further, the circuit board 10 is sleeved on the central conductor 2, and the capacitor 9 and the resistor 8 are respectively arranged on the circuit board 10.

As can be seen from the above description, the circuit board 10 can be used as a carrier of the capacitor 9 and the resistor 8 to conduct a circuit.

Further, the capacitor 9 and the resistor 8 are integrated in the circuit board 10.

As can be seen from the above description, the mounting form of the capacitor 9 and the resistor 8 on the circuit board 10 can be set according to the actual application requirements.

Example one

Referring to fig. 1 to 4, a first embodiment of the present invention is: a novel direct current isolation precision load is used for being connected with a communication cable, has all functions of a common radio frequency connector, can be used for connecting the communication cable, can isolate direct current and inhibit electromagnetic interference, and specifically comprises a shell 1, a central conductor 2 arranged in the shell 1, a capacitor 9 connected with the central conductor 2, and a resistor 8 connected with the capacitor 9 in series and grounded, wherein the capacitor 9 and the shell 1 form an inductor, one end in the shell 1 is provided with a threaded hole used for being connected with the communication cable, one end of the central conductor 2 is positioned in a stroke area of the threaded hole, more specifically, the direct current isolation precision load also comprises an outer conductor 6, the shell 1 is sleeved on the outer conductor 6, and the central conductor 2, the capacitor 9 and the resistor 8 are respectively arranged in the outer conductor 6; this novel accurate load's of direct current isolation schematic circuit diagram is shown in fig. 1, through connecting central conductor 2 and electric capacity 9 for electric capacity 9 forms the inductance with shell 1, recycles electric capacity 9 and resistance 8 series ground connection, so, alright select different specification electric capacity 9 according to the demand, with the effective isolation of realization to direct current signal, this novel accurate load of direct current isolation has integrated radio frequency terminal load and coaxial direct current DC blocking device, makes its function integration, has reduced installation space, has reduced manufacturing cost.

Referring to fig. 3, the dc isolation precision load further includes a first insulating medium 5 sleeved on the central conductor 2, one end of the central conductor 2 is exposed out of the first insulating medium 5, and one end of the outer conductor 6 away from the first insulating medium 5 is provided with a second insulating medium 11, so that it is easy to understand that the first insulating medium 5 and the second insulating medium 11 are convenient to form a protection and isolation function on the central conductor 2, the capacitor 9 and the resistor 8, and the stability of the dc isolation precision load performance is enhanced; in more detail, a label 7 is arranged on the outer side of the second insulating medium 11, and the label 7 is used for marking a circuit parameter.

Referring to fig. 2 and fig. 3, the dc isolation precision load further includes a circuit board 10 sleeved on the central conductor 2, the capacitor 9 and the resistor 8 are respectively disposed on the circuit board 10, and it is easy to understand that the circuit board 10 can be used as a carrier of the capacitor 9 and the resistor 8 to realize circuit conduction. Optionally, the capacitor 9 and the resistor 8 are integrated in the circuit board 10, and the mounting form of the capacitor 9 and the resistor 8 on the circuit board 10 may be specifically set according to the actual application requirement.

Preferably, a step surface for installing the capacitor 9 and the resistor 8 is further opened in the outer conductor 6, and it is easy to understand that the step surface can ensure that the capacitor 9 and the resistor 8 are more stably installed in the outer conductor 6.

In order to enhance the stability of the connection between the housing 1 and the outer conductor 6, a clamp spring 4 connected with the housing 1 is further arranged on the outer conductor 6, specifically, because the housing 1 is sleeved on the outer conductor 6, the housing 1 can rotate relative to the outer conductor 6 and can slide along the axial direction of the outer conductor 6, when the housing 1 generates axial sliding displacement relative to the outer conductor 6, the housing 1 is easily separated from the outer conductor 6, and connection failure is caused, so that the clamp spring 4 is arranged to limit the sliding of the housing 1 along the axial direction of the outer conductor 6; more specifically, the shell 1 is provided with a limiting groove corresponding to the position of the clamp spring 4, so that the clamp spring 4 can effectively limit the shell 1, and the risk of separation of the shell 1 from the outer conductor 6 is reduced.

In order to reduce the risk of rain erosion of the central conductor 2, a sealing element is further arranged on the outer conductor 6, and specifically, the sealing element is arranged between the outer shell 1 and the outer conductor 6; optionally, the sealing member is a waterproof ring 3.

Please refer to fig. 4, fig. 4 is a comparison diagram of the design simulation data and the actual test data of the dc isolated precision load, wherein the smooth curve in fig. 4 represents the simulation design value, the wave curve is the actual test value, the design requirement has an echo loss less than or equal to-30 dB in the frequency range of 300MHZ-6GHZ, it is easy to see that the coincidence degree of the simulation value and the actual value of the dc isolated precision load is very high, which satisfies the design requirement and reaches the expected standard.

In conclusion, the novel direct current isolation precision load provided by the invention integrates the radio frequency terminal load and the coaxial direct current DC isolator, so that the functions of the novel direct current isolation precision load are integrated, the installation space is reduced, and the manufacturing cost is reduced.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims

1. A novel direct current isolation precision load is characterized by comprising a shell, a central conductor arranged in the shell, a capacitor connected with the central conductor, a resistor connected with the capacitor in series and grounded, wherein the capacitor and the shell form an inductor; the capacitor and the resistor are integrated in the circuit board, the circuit board is sleeved on the central conductor, one end of the central conductor is exposed out of the first insulating medium, and one end of the outer conductor, far away from the first insulating medium, is provided with a second insulating medium.

2. The novel direct-current isolation precision load as claimed in claim 1, wherein a step surface for mounting the capacitor and the resistor is further formed in the outer conductor.

3. The novel direct current isolation precision load as claimed in claim 1, wherein a clamp spring connected with the housing is further arranged on the outer conductor.

4. The novel direct current isolation precision load according to claim 1, wherein a sealing element is further arranged on the outer conductor.