CN112186322B

CN112186322B - Quasi-air dielectric stripline low-loss power divider

Info

Publication number: CN112186322B
Application number: CN202010899142.1A
Authority: CN
Inventors: 刘辰; 叶正浩; 许露; 张祖存
Original assignee: Yangzhou Institute Of Marine Electronic Instruments No723 Institute Of China Shipbuilding Industry Corp
Current assignee: Yangzhou Institute Of Marine Electronic Instruments No723 Institute Of China Shipbuilding Industry Corp
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-06-29
Anticipated expiration: 2040-08-31
Also published as: CN112186322A

Abstract

The invention discloses a quasi-air dielectric stripline low-loss power divider, wherein a power divider circuit is printed on a polyimide substrate; the upper side and the lower side of the polyimide substrate are respectively provided with expanded polystyrene for supporting the printed circuit, and quasi-air media are formed on the upper side and the lower side of the printed circuit. The power divider has the advantages of simple structure, low loss and light weight.

Description

Quasi-air dielectric stripline low-loss power divider

Technical Field

The invention relates to a microwave power distribution technology of a radio frequency circuit, in particular to a quasi-air dielectric strip line low-loss power divider.

Background

The power divider is an important part for completing power distribution and synthesis in a microwave system, and is widely applied to the fields of microwave communication, radar, remote sensing, microwave measurement and the like. The power divider is divided into microstrip line type, strip line type and coaxial cavity power dividers according to the circuit form, wherein the coaxial cavity power divider can bear the largest power tolerance and has small insertion loss, but the output standing wave is larger, the output port has no isolation measure, and the integration and the miniaturization of the system are difficult to realize due to larger volume. The microstrip line type power divider can bear the minimum power, and has larger insertion loss due to a semi-open structure, but has small circuit volume and solves the problems of integration, miniaturization and the like of a microwave system. The strip line type power divider has low cost and stable performance, but mostly adopts a high-frequency microwave substrate form, and has larger insertion loss.

Disclosure of Invention

The invention aims to provide a quasi-air dielectric stripline low-loss power divider, which solves the problem of large loss of a stripline power divider in the form of a common high-frequency microwave substrate.

The technical solution for realizing the purpose of the invention is as follows: a quasi-air dielectric strip line low-loss power divider is characterized in that a power divider circuit is printed on a polyimide substrate; the upper side and the lower side of the polyimide substrate are respectively provided with expanded polystyrene for supporting the printed circuit, and quasi-air media are formed on the upper side and the lower side of the printed circuit.

Furthermore, the power divider also comprises a box body and a cover plate, wherein after the lower-layer expanded polystyrene, the polyimide substrate printed with the power divider circuit, the pressing block and the upper-layer expanded polystyrene are sequentially placed into the box body, the cover plate is used for fixing the above structures to realize the packaging assembly of the power divider.

Furthermore, the power divider is also provided with a pressing block on the polyimide substrate, and the pressing block is used for stretching the polyimide substrate to realize the flatness.

Furthermore, a groove is formed in the box body, a protrusion is arranged in the middle of the pressing block, and the protrusion of the pressing block is embedded into the groove of the box body after the pressing block presses the polyimide substrate.

Furthermore, a groove is formed in the box body, a protruding pressing block is arranged on the cover plate, and after the cover plate is assembled, the protruding pressing block is embedded into the groove of the box body.

Furthermore, pin holes are formed in the box body, the cover plate and the pressing block, and the pin is matched with the pin to achieve packaging and assembling of the power divider.

Furthermore, the power divider circuit adopts a Wilkinson power divider as a basic power divider, and three-level cascade connection is carried out in a binary mode to form a 1-to-8-level power divider; the thickness of the polyimide substrate is 0.05 mm; the thickness of the expanded polystyrene is 1.5 mm.

A packaging and assembling method of a quasi-air dielectric strip line low-loss power divider realizes the assembly of any one of the power dividers.

Compared with the prior art, the invention has the following remarkable advantages: the power divider has the advantages of simple structure, low loss and light weight.

Drawings

Fig. 1 is an exemplary diagram of a power divider circuit.

Fig. 2 is an assembly view of a quasi-air dielectric stripline low loss power splitter.

Fig. 3 is a detailed view of a quasi-air dielectric stripline low-loss power divider box.

Fig. 4 is a detail view of a quasi-air dielectric stripline low loss power divider metal compact.

Fig. 5 is a detail view of a quasi-air dielectric stripline low loss power splitter cover plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Fig. 1 is an exemplary diagram of a power divider circuit, in which a Wilkinson power divider is used as a basic power divider, and a binary system manner is used to form a 1-division-8-level power divider through three-level cascading. The main principle of the Wilkinson power divider is that an isolation resistor is introduced into the power divider, so that the power divider is changed into a three-port network with power consumption, and the three-port network with power consumption can be completely matched and has higher isolation between output ports according to the property of the three-port network, thereby improving the performance of the power divider. The power divider is composed of a strip transmission line 1 and an isolation resistor 2.

Fig. 2 is an assembly diagram of a quasi-air dielectric strip line low-loss power divider, in which a lower layer of expanded polystyrene 4 is first placed in a box body 3 of the power divider; then, a polyimide substrate 5 is flatly laid on the lower layer of expanded polystyrene 4, and a power divider circuit is printed on the polyimide substrate; fixing the stretched polyimide substrate by metal pressing blocks 7 at the left side and the right side of the polyimide substrate 5, and placing upper-layer expanded polystyrene 6; and finally, the internal structure is fixed through the power divider cover plate 8 to achieve electromagnetic shielding. The invention utilizes the expanded polystyrene to support the printed circuit and form quasi-air media on the upper side and the lower side of the printed circuit. Because the polyimide substrate is made of flexible materials and is very thin, the flatness of the printed circuit is difficult to keep only through the support of the expanded polystyrene, and the flatness of the printed circuit can be better ensured by carrying out the structural design of the pressing block.

Fig. 3 is a low-loss merit of quasi-air dielectric stripline and divides ware box body detail picture, the 3 left and right sides of box body set up the recess that corresponds with the 7 archs of briquetting, the upper and lower both sides set up the recess that corresponds with 8 protruding briquettings of apron, place lower floor's expanded polystyrene 4, the polyimide substrate 5 that the ware circuit was divided to the printing merit of tiling, place briquetting 7 back, polyimide substrate 5 flushes with 7 positions of briquetting of the box body left and right sides, place upper strata expanded polystyrene 6 and apron 8 back, the ware circuit was divided to the merit of printing about both sides put into the box body.

Fig. 4 is a detailed view of a quasi-air dielectric stripline low-loss power divider metal pressing block, the middle of the pressing block 7 is convex and rounded, and when the pressing block is installed on the box body 3, the upper side and the lower side of the polyimide substrate 5 can be fixed, and the polyimide substrate can be stretched.

As shown in fig. 5, a detailed view of a cover plate of a quasi-air dielectric stripline low-loss power divider is provided, wherein protruding press blocks are arranged on the upper side and the lower side of the cover plate 8, so that the upper side and the lower side of the polyimide substrate 5 can be fixed and electromagnetic shielding can be realized when the cover plate is mounted on the box body 3.

As a specific example, the thickness of the polyimide substrate 5 is only 0.05mm, and the thickness of the lower expanded polystyrene layer 4 and the upper expanded polystyrene layer 6 is 1.5 mm.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A quasi-air dielectric strip line low-loss power divider is characterized in that a power divider circuit is printed on a polyimide substrate; respectively arranging expanded polystyrene on the upper side and the lower side of the polyimide substrate for supporting the printed circuit and forming quasi-air media on the upper side and the lower side of the printed circuit; a pressing block is also arranged on the polyimide substrate and used for stretching the polyimide substrate to realize the flatness;

still include box body and apron, set up the pinhole on box body, apron and the briquetting, the box body is put into in proper order to lower floor's expanded polystyrene, the polyimide substrate, the briquetting, the upper strata expanded polystyrene that print the merit and divide the ware circuit after, and the encapsulation assembly that the ware was divided to cooperation pin realization merit.

2. The quasi-air dielectric stripline low loss power divider as recited in claim 1, wherein the box body is provided with a groove, a protrusion is provided in the middle of the pressing block, and the protrusion is embedded in the groove of the box body after the pressing block presses the polyimide substrate.

3. The quasi-air dielectric stripline low loss power divider of claim 1, wherein the box body is provided with a recess and the cover plate is provided with a protrusion, and after the cover plate is assembled, the protrusion is inserted into the recess of the box body.

4. The quasi-air dielectric stripline low-loss power divider as recited in claim 1, wherein the power divider circuit adopts a Wilkinson power divider as a basic power divider, and forms a 1-to-8 equal power divider through three-level cascade in a binary manner; the thickness of the polyimide substrate is 0.05 mm; the thickness of the expanded polystyrene is 1.5 mm.

5. A packaging and assembling method of a quasi-air dielectric strip line low-loss power divider realizes the assembly of the power divider of any one of claims 1 to 4.