Four-way duplexer with cavity

Abstract

The utility model discloses a four-way cavity duplexer, which relates to the technical field of mobile communication indoor distribution and comprises a cavity, a connector body is arranged on the cavity, a cross coupling rod, a cross coupling medium and a resonant column are arranged in the cavity, and a conductor in the connector is connected with a tapped line; the debugging cover plate is mounted at a cavity opening of the cavity, a plurality of tuning screw rods are mounted on the debugging cover plate in a penetrating manner, and the bottom ends of the tuning screw rods extend into the cavity; the waterproof cover plate is located above the debugging cover plate, and the waterproof cover plate is connected with the cavity; and a resonant medium is arranged in the cavity and is clamped between the resonant column and the debugging cover plate. According to the notch cavity cutting broadband topological structure design generated by the utility model, more transmission passbands are realized by using the least resonant cavities, and compared with a traditional duplexer, the cavity is smaller, and the used parts are fewer, so that the cost is reduced by at least 40%.

Description

Technical Field

[0001] The utility model relates to the technical field of indoor distribution of mobile communications, in particular to a four-passband cavity duplexer. Background Art

[0002] A multiplexer is a general term for a class of devices such as duplexers, triplexers, and quadplexers. It has a single input port and multiple output ports. A multiplexer is a set of non-overlapping filters that are combined in a way that they do not load each other and the outputs are highly isolated. A duplexer consists of two filters combined to share a common node, allowing the device to transmit and receive at the same time.

[0003] Traditional multiplexer design requires as many filters as there are transmission passbands, which requires more resonant cavities, resulting in a complex structure, large size, and high cost for the multiplexer. In addition, when combining multiple passbands, the design and implementation are very difficult due to the large number of taps, which can easily lead to design failure. Utility Model Content

[0004] The utility model aims to provide a four-pass band cavity duplexer to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the utility model provides the following technical solution: a four-pass cavity duplexer, comprising:

[0006] A cavity, wherein a connector body is arranged on the cavity, wherein the connector body comprises a connector inner conductor, a connector medium and a connector shell, wherein a cross-coupling rod, a cross-coupling medium and a resonant column are arranged in the cavity, wherein the cross-coupling rod is connected to the cross-coupling medium, a tap line is connected to the connector inner conductor, and an end of the tap line away from the connector inner conductor is connected to the resonant column;

[0007] A debugging cover plate, the debugging cover plate is installed at the cavity opening of the cavity, a plurality of tuning screws are installed through the debugging cover plate, the bottom ends of the tuning screws penetrate into the cavity, and the tuning screws disturb the electromagnetic field by passing through the debugging cover plate and penetrating into the cavity, thereby achieving the effect of changing the filter network;

[0008] A waterproof cover plate, the waterproof cover plate is located above the debugging cover plate, and the waterproof cover plate is connected to the cavity;

[0009] A resonant medium is arranged in the cavity, and the resonant medium is sandwiched between the resonant column and the debugging cover plate to prevent the filter from sparking when a large power is loaded, thereby ensuring that the filter has good power capacity performance.

[0010] Preferably, the cavity is made of aluminum alloy die-casting, the inner surface of the cavity is electroplated with a conductive layer, and the outer surface of the cavity is sprayed with a salt spray corrosion protection coating.

[0011] Preferably, the debugging cover is stamped from an aluminum plate, and a plurality of first fastening screws are provided at the edge of the debugging cover. The debugging cover is connected to the cavity through the plurality of first fastening screws. After the debugging cover is fixedly connected to the cavity, an enclosed space is formed, allowing electromagnetic waves to propagate in this enclosed space.

[0012] Preferably, the waterproof cover plate is stamped from an aluminum plate, a surface of the waterproof cover plate is sprayed with an anti-salt spray corrosion coating, a plurality of second fastening screws are provided on the edge of the waterproof cover plate, and the waterproof cover plate is connected to the cavity via the plurality of second fastening screws.

[0013] Preferably, the connector body is provided with a plurality of locking screws, and the connector body is connected to the cavity via the plurality of locking screws.

[0014] Preferably, a locking nut is threadedly sleeved on the upper end of the tuning screw, and the locking nut is located on the upper side of the debugging cover.

[0015] Preferably, a rubber sealing ring is embedded in the waterproof groove on the upper edge of the cavity, and the waterproof cover compresses the rubber sealing ring to produce a waterproof effect.

[0016] Preferably, the resonant medium is made of polytetrafluoroethylene;

[0017] The cross-coupling medium is made of insulated polytetrafluoroethylene material, and the cross-coupling medium suspends the cross-coupling rod inside the cavity without short-circuiting the cavity;

[0018] The cross-coupling rod is made of copper rod processed by electroplating process, and its function is to generate zero point inside the filter, so as to achieve a specific rectangular coefficient.

[0019] Preferably, one end of the tap wire away from the inner conductor of the connector is fixedly wrapped with a heat shrink tubing, the heat shrink tubing is made of insulating material, and the tap wire and the resonant column are insulated by the insulating heat shrink tubing;

[0020] The resonant column is provided with a third fastening screw, and the resonant column is connected to the cavity through the third fastening screw.

[0021] Preferably, the connector inner conductor and the connector shell are both made of copper material, and the connector medium is made of polytetrafluoroethylene material.

[0022] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0023] The notch cavity cutting broadband topology structure design produced by the utility model realizes more transmission passbands with the least resonant cavities. Using the traditional topology structure design to realize 4 passbands requires at least 36 resonant cavities, while using the notch cavity cutting broadband topology structure design of the utility model only requires 27 resonant cavities, which reduces the number of resonant cavities by 25%. Compared with the traditional duplexer, the cavity is smaller and fewer parts are used, resulting in at least 40% reduction in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a top view of the cavity of the utility model;

[0027] Figure 3 It is a partial cross-sectional view of the utility model;

[0028] Figure 4 This is a topological diagram of the broadband cutting of the notch cavity of the utility model;

[0029] Figure 5 This is a traditional topological structure diagram.

[0030] Description of reference numerals:

[0031] 1. Cavity; 2. Debugging cover; 3. Waterproof cover; 4. Connector body; 5. Locking screw; 6. Tuning screw; 7. Locking nut; 8. First fastening screw; 9. Second fastening screw; 10. Rubber sealing ring; 11. Resonant medium; 12. Cross-coupling rod; 13. Cross-coupling medium; 14. Resonant column; 15. Tap line; 16. Heat shrink tubing; 17. Third fastening screw; 18. Connector inner conductor; 19. Connector medium; 20. Connector shell. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] The utility model provides Figures 1 to 5 A four-passband cavity duplexer is shown, comprising:

[0034] A cavity 1 is provided with a connector body 4, the connector body 4 includes a connector inner conductor 18, a connector medium 19 and a connector shell 20, a cross-coupling rod 12, a cross-coupling medium 13 and a resonant column 14 are provided in the cavity 1, the cross-coupling rod 12 is connected to the cross-coupling medium 13, a tap line 15 is connected to the connector inner conductor 18, and one end of the tap line 15 away from the connector inner conductor 18 is connected to the resonant column 14;

[0035] The debugging cover plate 2 is installed at the cavity opening of the cavity 1. A plurality of tuning screws 6 are installed through the debugging cover plate 2. The bottom ends of the tuning screws 6 extend deep into the cavity 1. The tuning screws 6 pass through the debugging cover plate 2 and extend deep into the cavity 1 to disturb the electromagnetic field, thereby changing the filter network.

[0036] A waterproof cover plate 3, which is located above the debugging cover plate 2 and is connected to the cavity 1;

[0037] A resonant medium 11 is disposed in the cavity 1 and is sandwiched between the resonant column 14 and the debugging cover 2 to prevent the filter from sparking when a large power is loaded, thereby ensuring that the filter has good power capacity performance.

[0038] The cavity 1 is made of aluminum alloy die-casting, the inner surface of the cavity 1 is electroplated with a conductive layer, and the outer surface of the cavity 1 is sprayed with a salt spray corrosion protection coating.

[0039] The debugging cover 2 is stamped from an aluminum plate, and a plurality of first fastening screws 8 are provided on the edge of the debugging cover 2. The debugging cover 2 is connected to the cavity 1 through the plurality of first fastening screws 8. After the debugging cover 2 is fixedly connected to the cavity 1, a closed space is formed, allowing electromagnetic waves to propagate in this closed space.

[0040] The waterproof cover plate 3 is stamped from an aluminum plate, and a salt spray corrosion resistant coating is sprayed on the surface of the waterproof cover plate 3 . A plurality of second fastening screws 9 are provided on the edge of the waterproof cover plate 3 , and the waterproof cover plate 3 is connected to the cavity 1 via the plurality of second fastening screws 9 .

[0041] The connector body 4 is provided with a plurality of locking screws 5 , and the connector body 4 is connected to the cavity 1 via the plurality of locking screws 5 .

[0042] The upper end of the tuning screw 6 is threadedly sleeved with a locking nut 7 , which is located on the upper side of the debugging cover 2 .

[0043] A rubber sealing ring 10 is embedded in the waterproof groove on the upper edge of the cavity 1, and the waterproof cover plate 3 compresses the rubber sealing ring 10 to produce a waterproof effect.

[0044] The resonance medium 11 is made of polytetrafluoroethylene;

[0045] The cross-coupling medium 13 is made of insulated polytetrafluoroethylene material, and the cross-coupling medium 13 suspends the cross-coupling rod 12 inside the cavity 1 without short-circuiting the cavity 1;

[0046] The cross-coupling rod 12 is made of copper rod processed by electroplating process, and its function is to generate a zero point inside the filter, so as to achieve a specific rectangular coefficient.

[0047] One end of the tap line 15 away from the inner conductor 18 of the connector is fixedly wrapped with a heat shrink tubing 16, which is made of insulating material. The tap line 15 and the resonant column 14 are insulated by the insulating heat shrink tubing 16;

[0048] A third fastening screw 17 is provided on the resonant column 14 , and the resonant column 14 is connected to the cavity 1 via the third fastening screw 17 .

[0049] The connector inner conductor 18 and the connector shell 20 are both made of copper material, and the connector medium 19 is made of polytetrafluoroethylene material.

[0050] In the utility model, the notch cavity cutting broadband topology structure design produced by the utility model realizes more transmission passbands with the least resonant cavities. Using the traditional topology structure design to realize 4 passbands requires at least 36 resonant cavities, while using the notch cavity cutting broadband topology structure design of the utility model only requires 27 resonant cavities, which is a 25% reduction in resonant cavities. Compared with the traditional duplexer, the cavity 1 is smaller and uses fewer parts, resulting in at least a 40% reduction in cost.

[0051] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A four-pass cavity duplexer, characterized in that: include: A cavity (1), wherein a connector body (4) is arranged on the cavity (1), wherein the connector body (4) comprises a connector inner conductor (18), a connector medium (19) and a connector shell (20), wherein a cross-coupling rod (12), a cross-coupling medium (13) and a resonant column (14) are arranged in the cavity (1), wherein the cross-coupling rod (12) is connected to the cross-coupling medium (13), wherein a tap line (15) is connected to the connector inner conductor (18), and wherein one end of the tap line (15) away from the connector inner conductor (18) is connected to the resonant column (14); A debugging cover plate (2), the debugging cover plate (2) being installed at the cavity opening of the cavity (1), a plurality of tuning screws (6) being installed through the debugging cover plate (2), the bottom ends of the tuning screws (6) being inserted deep into the cavity (1); A waterproof cover plate (3), the waterproof cover plate (3) being located above the debugging cover plate (2), and the waterproof cover plate (3) being connected to the cavity (1); A resonant medium (11) is arranged in the cavity (1), and the resonant medium (11) is sandwiched between a resonant column (14) and a debugging cover plate (2).

2. The quad-band cavity duplexer according to claim 1, characterized in that: The cavity (1) is made by die-casting of an aluminum alloy, the inner surface of the cavity (1) is electroplated with a conductive layer, and the outer surface of the cavity (1) is sprayed with a salt spray corrosion resistant coating.

3. The quad-band cavity duplexer according to claim 1, characterized in that: The debugging cover plate (2) is formed by stamping an aluminum plate, a plurality of first fastening screws (8) are provided on the edge of the debugging cover plate (2), and the debugging cover plate (2) is connected to the cavity (1) via the plurality of first fastening screws (8).

4. The quad-band cavity duplexer according to claim 1, characterized in that: The waterproof cover plate (3) is formed by stamping an aluminum plate, a surface of the waterproof cover plate (3) is sprayed with a salt spray corrosion resistant coating, a plurality of second fastening screws (9) are provided on the edge of the waterproof cover plate (3), and the waterproof cover plate (3) is connected to the cavity (1) via the plurality of second fastening screws (9).

5. The quad-band cavity duplexer according to claim 1, characterized in that: The connector body (4) is provided with a plurality of locking screws (5), and the connector body (4) is connected to the cavity (1) via the plurality of locking screws (5).

6. The quad-band cavity duplexer according to claim 1, characterized in that: The upper end of the tuning screw (6) is threadedly sleeved with a locking nut (7), and the locking nut (7) is located on the upper side of the debugging cover (2).

7. The quad-band cavity duplexer according to claim 1, characterized in that: A rubber sealing ring (10) is nested in the waterproof groove on the upper edge of the cavity (1).

8. The quad-band cavity duplexer according to claim 1, characterized in that: The resonant medium (11) is made of polytetrafluoroethylene; The cross-coupling medium (13) is made of insulating polytetrafluoroethylene material; The cross-coupling rod (12) is made of a copper rod and is manufactured through an electroplating process.

9. The quad-band cavity duplexer according to claim 1, characterized in that: One end of the tap wire (15) away from the inner conductor (18) of the connector is fixedly wrapped with a heat shrink tubing (16), and the heat shrink tubing (16) is made of insulating material; The resonant column (14) is provided with a third fastening screw (17), and the resonant column (14) is connected to the cavity (1) via the third fastening screw (17).

10. The quad-band cavity duplexer according to claim 1, characterized in that: The connector inner conductor (18) and the connector shell (20) are both made of copper material, and the connector medium (19) is made of polytetrafluoroethylene material.

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