CN220420850U - Double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit - Google Patents
Double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit Download PDFInfo
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- CN220420850U CN220420850U CN202322091085.6U CN202322091085U CN220420850U CN 220420850 U CN220420850 U CN 220420850U CN 202322091085 U CN202322091085 U CN 202322091085U CN 220420850 U CN220420850 U CN 220420850U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 238000002955 isolation Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 230000010363 phase shift Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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Abstract
The utility model relates to an anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit with double shielding cases, which comprises a mounting plate, a broadband Wilkinson power division circuit, a broadband radio frequency circuit, an outer shielding case and an inner shielding case, wherein the broadband radio frequency circuit is arranged on the mounting plate; the broadband Wilkinson power dividing circuit is of a one-to-two structure with annular inner winding, and the inner shielding cover covers the broadband Wilkinson power dividing circuit; the outer shield covers the inner shield and the broadband radio frequency circuit. The double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit adopts the broadband CRLH transmission line to replace the phase shift microstrip line, thereby greatly reducing the circuit area, expanding the working bandwidth, reducing the influence of internal and external interference on the circuit and improving the performance stability of the circuit through careful wiring and double-shielding-case structure.
Description
Technical Field
The utility model relates to the technical field of radio frequency circuits of satellite positioning antennas, in particular to an anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit with double shielding cases.
Background
In the prior art, the radio frequency circuit adapted to the satellite positioning antenna mostly adopts a narrower bandwidth design, and generally only has a bandwidth of tens of megahertz to 30 megahertz, and can only support part of high-frequency or low-frequency parts of Global Navigation Satellite System (GNSS) signals. The narrow-band design makes the radio frequency circuit difficult to cover all frequency bands of the GNSS, and limits the application range of the positioning antenna.
Meanwhile, some radio frequency circuits attempting to realize wideband are still designed in a matching manner by adopting a traditional microstrip line in a compensation circuit part. However, it is difficult to avoid various errors in manufacturing, such as variations in line width, dielectric constant, conductive loss, and the like. These uncontrolled errors can directly affect the compensation effect, resulting in a final rf circuit with less than optimal operating bandwidth and performance.
For the volume aspect, most radio frequency circuits adopt a Wilkinson power division structure. Such structures are bulky and inconvenient for miniaturized processing. To achieve miniaturization, it is often necessary to replace the microstrip line portion with a large number of discrete components. Overuse of components directly increases cost and mismatch risk.
Disclosure of Invention
In order to solve the problems, the utility model provides the annular internal winding broadband Wilkinson power division radio frequency circuit which adopts the broadband CRLH transmission line to replace the phase shift microstrip line, effectively reduces the circuit area and expands the working bandwidth, reduces the influence of internal and external interference on the circuit through careful wiring and a double-shielding cover structure, and improves the circuit performance stability.
In order to achieve the purpose, the double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit comprises a mounting plate, a broadband Wilkinson power division circuit, a broadband radio frequency circuit, an outer shielding case and an inner shielding case, wherein the broadband radio frequency circuit is arranged on the mounting plate and is adapted to a GNSS satellite positioning frequency band; the broadband Wilkinson power dividing circuit is of a one-to-two structure with annular inner winding, and comprises a broadband CRLH transmission line, a phase-shifting microstrip line, an isolation resistor and a microstrip transmission line; the wavelength of the microstrip transmission line is one quarter of the wavelength of the GNSS frequency band center frequency; the broadband CRLH transmission line is a mixed left-right hand transmission line adapting to the GNSS broadband frequency band and is connected with a first feed point of the antenna; the phase-shifting microstrip line is connected with a second feed point of the antenna; the output ends of the broadband CRLH transmission line and the phase-shifting microstrip line are connected in parallel through an isolation resistor and then connected in parallel through the two microstrip transmission lines to form a merging point; the combining point is connected to the input end of the broadband radio frequency circuit, and the output end of the broadband radio frequency circuit is connected to an output point bonding pad arranged on the board edge of the assembly board through a microstrip line; the inner shielding cover covers the broadband Wilkinson power dividing circuit, and a first wire outlet hole for a merging point to pass through is formed in one side of the inner shielding cover and connected to a transmission line at the input end of the broadband radio frequency circuit; the outer shielding cover covers the inner shielding cover and the broadband radio frequency circuit, and a second wire outlet hole for the coaxial cable connected with the output point bonding pad to pass through is formed in one side of the outer shielding cover.
In order to reduce the interference of the shielding cover structure on the output signal, the first wire outlet hole and the second wire outlet hole are not arranged on the same side of the assembly plate.
In order to improve the anti-interference performance of the circuit, a first grounding pad and a second grounding pad are arranged on the surface of the assembly board, the first grounding pad is covered by an inner shielding cover, and the grounding part of the broadband CRLH transmission line is grounded by the first grounding pad; the second grounding pad is covered by the outer shielding cover and is positioned between the output point pad and the board edge of the assembly board, and is used for realizing grounding for the coaxial cable connected with the output point pad.
For compact wiring, the broadband wilkinson power dividing circuit is provided in an upper middle portion of the mounting board.
In order to improve shielding and isolation effects, the outer shielding cover and the inner shielding cover are made of metal materials, and the outer shielding cover covers the whole circuit.
In order to realize low cost, the assembly plate is a PCB assembly plate with double-sided copper-clad FR-4 material.
The double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit adopts the broadband CRLH transmission line to replace the phase shift microstrip line, thereby greatly reducing the circuit area, expanding the working bandwidth, reducing the influence of internal and external interference on the circuit and improving the performance stability of the circuit through careful wiring and double-shielding-case structure.
Drawings
Fig. 1 is a schematic circuit configuration of embodiment 1.
Wherein: the assembly board 1, the first feed point 11, the second feed point 12, the first ground pad 13, the second ground pad 14, the broadband wilkinson power division circuit 2, the broadband CRLH transmission line 21, the phase-shifting microstrip line 22, the isolation resistor 23, the microstrip transmission line 24, the broadband radio frequency circuit 3, the outer shield 4, the second wire outlet hole 41, the inner shield 5, the first wire outlet hole 51, the combining point 6, and the output point pad 7.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1.
As shown in fig. 1, the dual-shielding-case anti-interference annular inner-winding broadband wilkinson power division radio frequency circuit described in the embodiment comprises a mounting plate 1, a broadband wilkinson power division circuit 2, a broadband radio frequency circuit 3, an outer shielding case 4 and an inner shielding case 5, wherein the broadband radio frequency circuit 3 is arranged on the mounting plate 1 and is adapted to a GNSS satellite positioning frequency band; the broadband Wilkinson power dividing circuit 2 is of a one-to-two structure with annular inner winding, and the broadband Wilkinson power dividing circuit 2 comprises a broadband CRLH transmission line 21, a phase-shifting microstrip line 22, an isolation resistor 23 and a microstrip transmission line 24; the wavelength of the microstrip transmission line 24 is one quarter of the wavelength of the center frequency of the GNSS band; the broadband CRLH transmission line 21 is a mixed left-right hand transmission line adapting to the GNSS broadband frequency band and is connected with the first feed point 11 of the antenna; the phase-shifting microstrip line 22 is connected with the second feed point 12 of the antenna; the output ends of the broadband CRLH transmission line 21 and the phase-shifting microstrip line 22 are connected in parallel through an isolation resistor 23 and then connected in parallel through two microstrip transmission lines 24 to form a merging point 6; the combining point 6 is connected to the input end of the broadband radio frequency circuit 3, and the output end of the broadband radio frequency circuit 3 is connected to an output point bonding pad 7 arranged on the board edge of the assembly board 1 through a microstrip line; the inner shielding cover 5 covers the broadband wilkinson power dividing circuit 2, and a first wire outlet hole 51 through which a combining point 6 is connected to a transmission line at the input end of the broadband radio frequency circuit 3 is formed in one side of the inner shielding cover 5; the outer shielding case 4 covers the inner shielding case 5 and the broadband radio frequency circuit 3, and a second wire outlet hole 41 through which a coaxial cable connected to the output point pad 7 passes is provided at one side of the outer shielding case 4. In this way, the broadband wilkinson power divider 2 is arranged on the board surface of the assembly board 1 in a ring-shaped internally-wound one-to-two structure, the first feed point 11 of the antenna is connected by adopting a conventional phase-shifting microstrip line 22, the second feed point 12 of the antenna is connected by using the CRLH transmission line 21 to replace the phase-shifting microstrip line with insufficient bandwidth, the area of the whole circuit is greatly reduced, the adaptive bandwidth is increased, then the output ends of the broadband CRLH transmission line 21 and the phase-shifting microstrip line 22 are connected in parallel through the isolation resistor 23, the two microstrip transmission lines 24 are connected in parallel to form a merging point 6, the merging point 6 passes through the first output line hole 51 through the transmission line to be connected to the input end of the broadband radio frequency circuit 3, namely, the signal processed by the broadband wilkinson power divider 2 enters the input end of the broadband radio frequency circuit 3 to be processed again, and finally is output through the output end of the broadband radio frequency circuit 2, the output end of the broadband radio frequency circuit 3 is led to the output point pad 7 on the board side of the assembly board 1 through a section of the microstrip line, the output point pad 7 is connected with a coaxial cable, and then the output point pad 7 is connected with the second output line hole 41 of the coaxial cable through the outer shielding cover 4 after being welded, the whole circuit is manufactured through the microstrip line, and the practical stability is improved through the design of the broadband shielding structure. In this embodiment, in order to achieve low cost and mass production, the assembly board 1 is a PCB assembly board with copper-clad double-sided FR-4 material.
In some embodiments, as shown in fig. 1, the first wire outlet hole 51 and the second wire outlet hole 41 are not disposed on the same side of the mounting plate 1. Therefore, the outgoing lines at different sides are more beneficial to the arrangement of pipelines in practical application, and simultaneously, the electromagnetic coupling between the inner shielding cover and the outer shielding cover can be reduced, and the interference of the shielding cover structure on output signals is reduced.
In some embodiments, as shown in fig. 1, a first grounding pad 13 and a second grounding pad 14 are disposed on the board surface of the assembly board 1, the first grounding pad 13 is covered by the inner shielding case 5, and the grounding portion of the broadband CRLH transmission line 21 is grounded by the first grounding pad 13; the second grounding pad 14 is covered by the outer shield 4 and is located between the output point pad 7 and the board edge of the mounting board 1 for realizing grounding for the coaxial cable connected to the output point pad 7. By utilizing the structural design, the first grounding pad (13) is used for grounding the broadband CRLH transmission line (21), so that good grounding reference can be provided for the CRLH transmission line, and normal operation of the CRLH transmission line is ensured; the second grounding pad (14) is used for grounding the outer conductor of the coaxial cable, can provide a grounding path for the coaxial cable and improves shielding effect.
In some embodiments, as shown in fig. 1, the broadband wilkinson power divider circuit 2 is disposed in an upper middle portion of the mounting board 1 for compact wiring. Meanwhile, the middle part is located upwards, so that the broadband Wilkinson power dividing circuit 2 is close to the antenna feed points (11 and 12), and the connection path between the broadband Wilkinson power dividing circuit and the antenna can be shortened.
In some embodiments, as shown in fig. 1, the outer shield 4 and the inner shield 5 are made of metal, and the outer shield 4 covers the entire circuit. The outer shielding cover 4 covers the whole circuit, so that the external noise interference can be reduced to the greatest extent, the metal shell is convenient for the structural mechanical strength, and the circuit safety is protected.
The double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit provided by the embodiment adopts a broadband CRLH transmission line to replace a phase shift microstrip line, thereby greatly reducing the circuit area, expanding the working bandwidth, reducing the influence of internal and external interference on the circuit through careful wiring and a double-shielding-case structure, and improving the stability of circuit performance.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The double-shielding-case anti-interference annular inner-winding broadband Wilkinson power division radio frequency circuit comprises a mounting plate (1), a broadband Wilkinson power division circuit (2), a broadband radio frequency circuit (3), an outer shielding case (4) and an inner shielding case (5), and is characterized in that the broadband radio frequency circuit (3) is arranged on the mounting plate (1) and is adapted to a GNSS satellite positioning frequency band; the broadband Wilkinson power dividing circuit (2) is of a one-to-two structure with annular inner winding, and the broadband Wilkinson power dividing circuit (2) comprises a broadband CRLH transmission line (21), a phase-shifting microstrip line (22), an isolation resistor (23) and a microstrip transmission line (24); the wavelength of the microstrip transmission line (24) is one quarter of the wavelength of the GNSS frequency band center frequency; the broadband CRLH transmission line (21) is a mixed left-right hand transmission line adapting to the GNSS broadband frequency band and is connected with a first feed point (11) of the antenna; the phase-shifting microstrip line (22) is connected with a second feed point (12) of the antenna; the output ends of the broadband CRLH transmission line (21) and the phase-shifting microstrip line (22) are connected in parallel through an isolation resistor (23) and then connected in parallel through two microstrip transmission lines (24) to form a merging point (6); the combining point (6) is connected to the input end of the broadband radio frequency circuit (3), and the output end of the broadband radio frequency circuit (3) is connected to an output point bonding pad (7) arranged on the board edge of the assembly board (1) through a microstrip line; the inner shielding cover (5) covers the broadband Wilkinson power dividing circuit (2), and a first wire outlet hole (51) through which a merging point (6) is connected to a transmission line at the input end of the broadband radio frequency circuit (3) is formed in one side of the inner shielding cover (5); the outer shielding cover (4) covers the inner shielding cover (5) and the broadband radio frequency circuit (3), and a second wire outlet hole (41) through which a coaxial cable connected with the output point bonding pad (7) passes is formed in one side of the outer shielding cover (4).
2. The double-shielding-case anti-interference annular inner-winding broadband wilkinson power division radio frequency circuit according to claim 1, wherein the first wire outlet hole (51) and the second wire outlet hole (41) are not arranged on the same side of the assembly plate (1).
3. The double-shielding-case anti-interference annular inner-winding broadband Wilkinson power division radio frequency circuit according to claim 1, wherein a first grounding pad (13) and a second grounding pad (14) are arranged on the surface of the assembly plate (1), the first grounding pad (13) is covered by the inner shielding case (5), and the grounding part of the broadband CRLH transmission line (21) is grounded by the first grounding pad (13); the second grounding pad (14) is covered by the outer shielding cover (4) and is positioned between the output point pad (7) and the board edge of the assembly board (1) and used for realizing grounding for the coaxial cable connected with the output point pad (7).
4. The double-shielding-case anti-interference annular inner-winding broadband Wilkinson power division radio frequency circuit according to claim 1, wherein the broadband Wilkinson power division circuit (2) is arranged in the upper middle part of the assembly plate (1).
5. The double-shielding-case anti-interference annular inner-winding broadband Wilkinson power division radio frequency circuit according to claim 1, wherein the outer shielding case (4) and the inner shielding case (5) are made of metal materials, and the outer shielding case (4) covers the whole circuit.
6. The anti-interference annular inner winding broadband wilkinson power division radio frequency circuit with the double shielding cover according to claim 1, wherein the assembly plate (1) is a PCB assembly plate made of double-sided copper-clad FR-4 materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322091085.6U CN220420850U (en) | 2023-08-04 | 2023-08-04 | Double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322091085.6U CN220420850U (en) | 2023-08-04 | 2023-08-04 | Double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220420850U true CN220420850U (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322091085.6U Active CN220420850U (en) | 2023-08-04 | 2023-08-04 | Double-shielding-case anti-interference annular inner winding broadband Wilkinson power division radio frequency circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220420850U (en) |
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2023
- 2023-08-04 CN CN202322091085.6U patent/CN220420850U/en active Active
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