Step air cavity structure of wilkinson power divider

Abstract

The utility model relates to the technical field of power dividers, in particular to a Wilkinson power divider step air cavity structure, which comprises a cavity, a cover plate is arranged at the upper end of the cavity, and a strip line is arranged in the cavity; an isolation resistor is welded in the middle of the strip line, a polytetrafluoroethylene strip is mounted on the strip line, and a connector is arranged on the strip line; and the transmission line in the cavity is provided with steps with different depths up and down. According to the utility model, each section of wire is bent to reduce the volume of a product, and the width of the strip line is greater than or equal to 2mm and the thickness is greater than or equal to 1mm, so that the deformation problem of the strip line is reduced and the scrap amount of the strip line is reduced during wire cutting, thereby saving the product cost; the inner cavity is an air cavity, the middle is an air medium of the product, the stability is high, the cost is avoided, the intermodulation index of the product is stable, and the third-order intermodulation reaches below-150dB.

Description

Technical Field

[0001] The utility model relates to the technical field of power dividers, in particular to a stepped air cavity structure of a wilkinson power divider. Background Art

[0002] With the development of microwave communication technology, the demand for high-power and broadband passive devices is increasing day by day. Among them, high-performance microwave power dividers are in more urgent demand due to their wide application range. A power divider (hereinafter referred to as a power splitter) is used in a microwave system, and its function is to divide a path of microwave power into multiple paths of output according to a certain ratio. Generally, from the perspective of transmission lines, wilkinson power dividers and coaxial cavity power dividers are mainly used.

[0003] In view of the requirement for the isolation degree of the output end, a wilkinson power divider must be used in some scenarios. The product indexes of the existing wilkinson power divider are realized by the copper-clad circuit on the dielectric plate for the indexes of standing wave and insertion loss, and the isolation index is realized by the isolation resistor in the circuit.

[0004] During the transmission process of the circuit on the dielectric plate, the power cannot be too large, and the instability of the dielectric causes the intermodulation of the product indexes to be unstable. It is very difficult for the third-order intermodulation to reach -150 dB. For a wilkinson cavity power divider, if the cavity depth remains the same, the impedance is changed by the width of the strip line to realize the indexes of standing wave and insertion loss. The width of the strip line at the input end is too narrow, which is prone to deformation and difficult to process. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a stepped air cavity structure of a wilkinson power divider is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] Design a stepped air cavity structure of a wilkinson power divider, including a cavity:

[0008] A cover plate is arranged at the upper end of the cavity, and a strip line is arranged inside the cavity;

[0009] An isolation resistor is welded at the middle position of the strip line, a tetrafluoro strip is installed on the strip line, and a connector is arranged on the strip line;

[0010] The transmission lines inside the cavity have different depths in a stepped shape up and down.

[0011] Preferably, the cover plate is provided with steps with different depths.

[0012] Preferably, the width of the strip line ≥ 2 mm and the thickness ≥ 1 mm.

[0013] Preferably, a plurality of the isolation resistors are welded in a notch formed by two strip lines and are axially distributed along the axial direction of the central axis of the strip line.

[0014] Preferably, the input end of the strip line is connected to a connector at the input end of the cavity, and the two output ends of the strip line are respectively correspondingly connected to connectors at the two output ends of the cavity.

[0015] Preferably, a plurality of internal threaded holes are provided on the cover plate, a plurality of threaded blind holes overlapping with the internal threaded holes are provided on the inner wall of the cavity, bolts are provided in the internal threaded holes, and the bolts respectively pass through the corresponding internal threaded holes and extend into the corresponding threaded blind holes to be locked, thereby forming an internal cavity in the cavity, and the internal cavity is an air cavity.

[0016] A Wilkinson power divider stepped air cavity structure proposed by the present utility model has the beneficial effects that: in this Wilkinson power divider stepped air cavity structure, the length of each section of the line is bent to reduce the product volume. The width of the strip line is ≥2 mm and the thickness is ≥1 mm. During wire cutting, the deformation problem of the strip line is reduced, and the scrap rate of the strip line is reduced, thereby saving the product cost;

[0017] The internal cavity is an air cavity, the air medium in the middle of the product is highly stable and cost-free, the intermodulation index of the product is stable, and the third-order intermodulation reaches below -150 dB. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural cross-sectional view of the A-A section of a Wilkinson power divider stepped air cavity structure proposed by the present utility model.

[0019] Figure 2 It is a structural top view of a Wilkinson power divider stepped air cavity structure proposed by the present utility model.

[0020] In the figure: cavity 1, cover plate 2, connector 3, strip line 4, tetrafluoro strip 5, bolt 6, isolation resistor 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0022] Referring to Figure 1-2 , a Wilkinson power divider stepped air cavity structure includes a cavity 1, a cover plate 2, a strip line 4, an isolation resistor 7 welded in the middle of the strip line 4, a tetrafluoro strip 5 for fixing the strip line 4 in the cavity 1, and a connector 3 fixed on the cavity 1 and connected to the strip line 4.

[0023] The transmission line inside the cavity 1 has stepped shapes with different depths above and below, and the impedance is adjusted by the different depths of the cavity 1.

[0024] The cover plate 2 is provided with steps with different depths. The width of the strip line 4 is ≥2 mm and the thickness is ≥1 mm. The width of the entire line segment is equal or the width of some segments is equal, and the line width and length are symmetrically the same left and right.

[0025] A plurality of isolation resistors 7 are welded in the notch formed by the two strip lines 4 and are axially distributed along the central axis of the strip line.

[0026] The strip line 4, that is, its input end is connected to the connector 3 at the input end of the cavity 1, and the two top ends of the strip line 4, that is, its two output ends, are respectively connected to the connectors 3 at the two output ends of the cavity 1 correspondingly, so that the strip line 4 forms a wilkinson two-way power divider.

[0027] The tetrafluoro strips 5 are fixed inside the cavity. The upper and lower tetrafluoro strips 5 fix the middle strip line 4. A plurality of internal threaded holes are provided on the cover plate 2, and a plurality of threaded blind holes overlapping with the internal threaded holes are provided on the inner wall of the cavity 1. A plurality of bolts 6 respectively pass through the corresponding internal threaded holes and then extend into the corresponding threaded blind holes to be locked, so as to form an internal cavity of the cavity 1. The internal cavity is an air cavity. The width of the strip line remains unchanged, and the various electrical performance indicators of the product are realized through the depth of the cavity, mainly the stability of the intermodulation. The stability of the air is good, the intermodulation index is stable, and the reasons for the stability are as follows:

[0028] 1. It will not change due to reasons such as thermal expansion and contraction under high and low temperature conditions;

[0029] 2. The common tetrafluoro medium we know, that is, polytetrafluoroethylene PTFE, may directly lead to the uncertainty of the product indicators due to the slight error in thickness;

[0030] 3. The intermodulation of the air cavity has no loss in the transmission of the metal strip line, and is more stable than the transmission of the dielectric plate. The strip line on the dielectric plate has a thickness of only 0.035 mm.

[0031] The third-order intermodulation reaches below -150 dB. The width of the strip line 4 is ≥2 mm and the thickness is ≥1 mm. During wire cutting production, the strip line 4 is not easily deformed, reducing the scrap rate during production, thereby saving costs.

[0032] The reason why the strip line 4 is not easily deformed is that the width of the strip line is increased by maintaining the impedance transformation of the stepped cavity, and the width of the strip line is maintained ≥1 MM, so it is not easily deformed. The traditional cavity is a flat cavity, which may cause the width of the strip line to be too narrow in the front and is easily deformed.

[0033] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A Wilkinson power divider stepped air cavity structure, comprising a cavity (1), characterized in that: A cover plate (2) is arranged at the upper end of the cavity (1), and a strip line (4) is arranged inside the cavity (1); An isolation resistor (7) is welded in the middle of the strip line (4), a polytetrafluoroethylene strip (5) is installed on the strip line (4), and a connector (3) is provided on the strip line (4); The transmission line inside the cavity (1) has steps of different depths at the top and bottom.

2. The Wilkinson power divider stepped air cavity structure according to claim 1, characterized in that: The cover plate (2) is provided with steps of different depths.

3. The Wilkinson power divider stepped air cavity structure according to claim 1, characterized in that: The strip line (4) has a width of ≥2 mm and a thickness of ≥1 mm.

4. The Wilkinson power divider stepped air cavity structure according to claim 1, characterized in that: A plurality of isolation resistors (7) are welded in the notches formed by the two strip lines (4) and are distributed axially along the central axis of the strip lines.

5. The Wilkinson power divider stepped air cavity structure according to claim 1, characterized in that: The input end of the strip line (4) is connected to the connector (3) at the input end of the cavity (1), and the two output ends of the strip line (4) are respectively connected to the connectors (3) at the two output ends of the cavity (1).

6. The Wilkinson power divider stepped air cavity structure according to claim 1, characterized in that: The cover plate (2) is provided with a plurality of internal threaded holes, the inner wall of the cavity (1) is provided with a plurality of threaded blind holes overlapping with the internal threaded holes, bolts (6) are provided in the internal threaded holes, and the bolts (6) respectively pass through the corresponding internal threaded holes and extend into the corresponding threaded blind holes to be locked, thereby forming an internal cavity of the cavity (1), and the internal cavity is an air cavity.

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