A KU-BAND satellite LNB structure

Abstract

The present invention provides a KU - BAND satellite low-noise block downconverter structure, belonging to the technical field of communication equipment. The present invention includes a feed and a waveguide connected to the feed. A first waveguide cavity is provided in the waveguide. It further includes a shielding cover and a PCB board arranged at the rear end of the waveguide. The shielding cover is vertically arranged with respect to the waveguide. A waveguide slot matching and communicating with the first waveguide cavity of the waveguide is provided at the upper end of the shielding cover. The waveguide cavity is an integral waveguide cavity enclosed by the waveguide cavity and the waveguide slot. A circuit board mounting surface is further provided at the upper middle part of the shielding cover. A horizontal polarization antenna and a vertical polarization antenna exposed in the waveguide cavity are provided on the PCB board. An output terminal connected to the PCB board is provided on the shielding cover. The beneficial effects of the present invention are: effectively reducing the length of the waveguide and the overall length of the product, with a simple product structure and high integration degree.

Description

Technical Field

[0001] The present invention relates to a satellite low-noise block downconverter (LNB) structure, and particularly to a KU-BAND satellite LNB structure. Background Art

[0002] Currently, the commonly used KU-BAND satellite LNB includes a horn antenna feed and a waveguide, as well as a circuit device. In the existing KU-BAND satellite LNB, the waveguide is a complete structure, and the circuit device PCB is installed on one side of the waveguide cavity, parallel to the waveguide cavity. Two probes need to be soldered on the PCB and extended into the waveguide cavity. This structure has the following defects:

[0003] 1. The circuit board extends horizontally and is completely independently arranged from the front-end waveguide part, resulting in a large volume of the LNB structure, low integration, inconvenient installation, more raw materials required, and high cost;

[0004] 2. After the waveguide part and the rear-end circuit device are separately assembled, the two are assembled with each other, and the production process is complex, resulting in low production efficiency;

[0005] 3. Both the horizontal probe and the vertical probe need to be separately soldered and fixed on the circuit board, with many processes and low production efficiency. Summary of the Invention

[0006] To solve the problems in the prior art, the present invention provides a KU-BAND satellite LNB structure.

[0007] The present invention includes a feed and a waveguide connected to the feed. A first waveguide cavity is provided in the waveguide. The present invention further includes a shield and a PCB board provided at the rear end of the waveguide. The shield is vertically arranged with respect to the waveguide. A waveguide slot matching and communicating with the first waveguide cavity of the waveguide is provided at the upper end of the shield. The waveguide cavity and the waveguide slot enclose an integral waveguide cavity. A circuit board mounting surface is further provided at the upper middle part of the shield. Horizontal polarization antennas and vertical polarization antennas exposed in the waveguide cavity are provided on the PCB board. Output terminals connected to the PCB board are provided on the shield.

[0008] The present invention is further improved in that a rear shell covering the circuit board mounting area of the shield is provided below the waveguide.

[0009] The present invention is further improved in that the horizontal polarization antenna is formed by cutting above the PCB board, and the horizontal polarization antenna above the PCB board is arranged in the waveguide cavity.

[0010] For further improvement of the present invention, the vertically polarized antenna is an L-shaped probe vertically welded to the PCB board. An installation groove matching the outer shape of the L-shaped probe is provided on the rear shell and / or the waveguide. The installation groove communicates with the waveguide cavity. The L-shaped probe is arranged in the installation groove, and the free end extends into the waveguide cavity.

[0011] For further improvement of the present invention, a plurality of mounting hole positions are provided on the outer periphery of the waveguide slot. Mounting holes corresponding to the mounting hole positions are provided on the PCB board. Threaded hole positions matching the mounting hole positions are provided on the waveguide. The shielding cover, the PCB board, and the waveguide are assembled and fixed by bolts.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The waveguide cavity is formed by combining the waveguide and the shielding cover of the circuit device at the rear end to form a complete waveguide cavity, effectively reducing the length of the waveguide and the overall length of the product. The product structure is simple, the integration degree is high, the overall volume of the product is compressed, the product is more miniaturized, which is beneficial to energy conservation and emission reduction, and the cost is greatly reduced. During production, only the shielding cover needs to be directly covered and fixed with the rear end of the waveguide, and the assembly process is simple, improving the production efficiency. The horizontally polarized antenna is directly cut from the PCB without welding, saving one process and further improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic exploded view of the present invention;

[0014] Figure 2 and Figure 3 is a schematic exploded view of the present invention;

[0015] Figure 4 is a schematic diagram of the PCB board structure of the present invention;

[0016] Figure 5 is a schematic diagram of the PCB board installation;

[0017] Figure 6 is a schematic diagram of the rear end face structure of the waveguide. DETAILED DESCRIPTION OF THE INVENTION

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

[0019] As Figures 1-3As shown in the figure, the present invention includes a feed source 1 and a waveguide 2 connected to the feed source 1. A first waveguide cavity 202 is provided inside the waveguide 2. The present invention further includes a circuit device disposed at the rear end of the waveguide 2, and the circuit device is perpendicularly disposed with respect to the waveguide 2. Specifically, in this example, the circuit device includes a shielding cover 5 and a rear shell 3 integrally formed with the waveguide 2. A PCB board 6 is fixed on a circuit mounting surface 502 between the rear shell 3 and the shielding cover 5. An output terminal 4 connected to the output end of the PCB board 6 is further provided below the shielding cover 5. The circuit mounting surface 502 of the PCB board 6 is located at the upper middle part of the waveguide cavity. The circuit mounting surface 502 is perpendicularly disposed with respect to the waveguide cavity.

[0020] Three mounting hole positions 503 are provided on the outer periphery of the waveguide slot 501. Mounting holes 609 corresponding to the mounting hole positions 503 are provided on the PCB board 6. Screw hole positions 201 matching the mounting hole positions are provided on the waveguide 2 and the rear shell 3. The shielding cover 5, the PCB board 6, and the waveguide 2 are assembled and fixed by bolts 7.

[0021] Compared with the prior art process of first assembling the circuit device, then inserting the probe, and finally fixing the circuit device to the circuit device, the present invention can directly assemble and fix the entire product with three screws, shortening the original three processes into one process, greatly improving the production efficiency.

[0022] In this example, a part of the waveguide cavity is located on the waveguide, and a part is located inside the shielding cover. Specifically, a waveguide slot 501 matching and communicating with the first waveguide cavity 202 of the waveguide 2 is provided at the upper end of the shielding cover 5 of this example. The waveguide slot 501 and the first waveguide cavity 202 enclose an integral waveguide cavity.

[0023] The present invention forms a complete waveguide cavity by combining the shielding cover of the circuit device at the rear end with the waveguide. On the one hand, it effectively reduces the length of the waveguide. In addition, it is changed from the original horizontal arrangement with the waveguide to a vertical arrangement, with high integration, effectively reducing the length of the overall product, compressing the overall volume of the product, making the product structure simpler, the product more miniaturized, facilitating energy conservation and emission reduction, and greatly reducing the cost.

[0024] Such as Figures 3-6As shown, the PCB board 6 in this example includes a horizontally polarized antenna 601, a vertically polarized antenna 602, a horizontal signal high-frequency amplification circuit 603 connected to the output end of the horizontally polarized antenna 601, a vertical signal high-frequency amplification circuit 604 connected to the output end of the vertically polarized antenna 602, and a signal processing IC 605 connected to the output ends of the horizontal signal high-frequency amplification circuit 603 and the vertical signal high-frequency amplification circuit 604 respectively. A crystal oscillator 606, a power supply 608, and a signal output 607 are also provided and connected to the signal processing IC 605 respectively. The circuit integration degree of this example is high. The horizontally polarized antenna 601 is directly formed by cutting the PCB board, without additional probe welding, saving one process and further improving the production efficiency. A terminal 401 communicating with the signal output is also provided inside the output terminal 4. A groove 302 for accommodating the terminal 401 is further provided at the lower end of the rear case 3 in this example.

[0025] After the PCB board in this example is installed on the circuit installation surface 502, the periphery of the PCB board 6 is arranged along the periphery of the waveguide slot 501, and the horizontally polarized antenna 601 is just distributed inside the waveguide slot 501.

[0026] The vertically polarized antenna 602 in this example is an L-shaped probe vertically welded to the PCB board 6. An installation slot 301 matching the shape of the L-shaped probe is provided on the rear case 3. The installation slot 301 communicates with the waveguide cavity. The L-shaped probe is arranged inside the installation slot 301, and the free end extends into the first waveguide cavity.

[0027] During assembly, when tightening the lock bolt 7, directly push the PCB board 6 forward, and the L-shaped probe will automatically enter the installation slot and be installed in place without interference with the waveguide. There is no need to insert the probe into the installation hole and then fix it. The assembly is very convenient, there is no interference with the waveguide, the product consistency is good, and there is no risk of the L-shaped probe tilting or falling during installation, further improving the product yield.

[0028] The above-described specific embodiments are the preferred embodiments of the present invention, and do not limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific embodiment. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A KU-BAND satellite LNB structure, Characterized in that: It includes a feed and a waveguide connected to the feed. A first waveguide cavity is provided in the waveguide. It also includes a shield and a PCB board provided at the rear end of the waveguide. The shield is perpendicular to the waveguide. A waveguide slot matching and communicating with the first waveguide cavity of the waveguide is provided at the upper end of the shield. The waveguide slot and the first waveguide cavity of the waveguide enclose an integral waveguide cavity. A circuit board mounting surface is also provided at the upper middle part of the shield. A horizontal polarization antenna and a vertical polarization antenna exposed in the waveguide cavity are provided on the PCB board. An output terminal connected to the PCB board is provided on the shield, The horizontal polarization antenna is formed by cutting above the PCB board, and the horizontal polarization antenna above the PCB board is arranged in the waveguide cavity, The vertical polarization antenna is an L-shaped probe vertically welded to the PCB board. An installation groove matching the outer shape of the L-shaped probe is provided on the rear shell and / or the waveguide. The installation groove communicates with the waveguide cavity. The L-shaped probe is arranged in the installation groove, and the free end extends into the waveguide cavity, The horizontal polarization antenna is arranged in the waveguide slot, and the vertical polarization antenna is arranged in the waveguide, A rear shell covering the circuit board mounting area of the shield is provided below the waveguide.

2. The KU-BAND satellite LNB structure according to claim 1, Characterized in that: A number of mounting hole positions are provided on the outer periphery of the waveguide slot. Mounting holes corresponding to the mounting hole positions are provided on the PCB board. Threaded hole positions matching the mounting hole positions are provided on the waveguide. The shield, the PCB board, and the waveguide are assembled and fixed by bolts.

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