CN214756333U - Radio frequency circuit and base station antenna strip line combiner - Google Patents
Radio frequency circuit and base station antenna strip line combiner Download PDFInfo
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- CN214756333U CN214756333U CN202120539246.1U CN202120539246U CN214756333U CN 214756333 U CN214756333 U CN 214756333U CN 202120539246 U CN202120539246 U CN 202120539246U CN 214756333 U CN214756333 U CN 214756333U
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Abstract
The utility model relates to a radio frequency technology field especially relates to a radio frequency circuit and applied this radio frequency circuit's basic station antenna stripline combiner. The radio frequency circuit comprises a high-frequency path transmission line, a low-frequency path transmission line and a combined matching transmission line, wherein at least two spiral open-circuit resonance branches are arranged on the high-frequency path transmission line, and at least two spiral open-circuit resonance branches are arranged on the low-frequency path transmission line. The stripline combiner comprises a combiner cavity, a combiner medium substrate, a PCB (printed Circuit Board) and a radio frequency circuit, wherein the radio frequency circuit is printed on the top and the bottom of the PCB and connected through metallized through holes, and the PCB is arranged in the combiner cavity. The utility model discloses utilize the spiral to open a way resonance minor matters and the folding line of walking of high frequency access transmission line, reduce radio frequency circuit's horizontal size effectively, reduced its self cost, and the spiral is opened a way the outband zero point that resonance minor matters produced, helps improving the outband and restraines.
Description
Technical Field
The utility model relates to a radio frequency technology field especially relates to a radio frequency circuit and applied this radio frequency circuit's basic station antenna stripline combiner.
Background
With the rapid development of mobile communication technology and the rapid increase of mobile communication traffic, in order to meet the development demand and improve the user experience, the number of cells is urgently increased, and the cell coverage quality is also required to be improved. In the current mobile communication system, in order to solve the problems of difficult site selection and high station building cost, operators often adopt a multi-system co-station mode, wherein a multi-frequency shared antenna is a better solution.
However, the existing resonant cavity combiner has the problems of large weight, large volume, high cost, difficulty in processing, difficulty in assembling and the like, and is not suitable for being integrated into an antenna; the microstrip combiner can be arranged in the antenna, but the stability is poor, the insertion loss is large, the gain of the antenna is reduced, and the coverage of the antenna signal is not facilitated.
Therefore, there is a need for a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of at least one aspect, the utility model provides a radio frequency circuit and applied this radio frequency circuit's base station antenna stripline combiner.
In order to realize the purpose of the utility model, the following technical scheme is adopted:
the utility model provides a radio frequency circuit, radio frequency circuit includes high frequency path transmission line, low frequency path transmission line and closes way matching transmission line, be equipped with two at least spirals on the high frequency path transmission line and open a way resonance minor matters, be equipped with two at least spirals on the low frequency path transmission line and open a way resonance minor matters.
The further improvement is that the combining matching transmission line is composed of at least two sections of transmission line folding lines with different widths.
The further improvement is that the high-frequency path transmission line is composed of at least three sections of transmission line folding wires with different widths, and a spiral open-circuit resonance branch is arranged at the joint of any two sections of the at least three sections of transmission lines with different widths.
The further improvement is that the low-frequency path transmission line is composed of at least three transmission lines with different widths, and a spiral open-circuit resonance branch is arranged at the joint of any two sections of the at least three transmission lines with different widths.
The improvement is that the spiral open-circuit resonance branches are arranged on the same side and/or different sides of the high-frequency path transmission line/the low-frequency path transmission line and are isolated from each other by the high-frequency path transmission line/the low-frequency path transmission line.
The further improvement is that the transmission line width of the combined matching transmission line and the high-frequency path transmission line is larger than that of the low-frequency path transmission line.
On the other hand, the utility model provides a basic station antenna stripline combiner, stripline combiner includes combiner cavity, combiner medium substrate and PCB printed circuit board, still includes any one of the aforesaid a radio frequency circuit, the radio frequency circuit printing is connected through the metallization via hole in PCB printed circuit board's top and bottom, the combiner cavity is arranged in to PCB printed circuit board.
A further improvement is that the adjacent metallized vias are less than one eighth of the operating wavelength.
In a further improvement, the combiner media substrate is air.
The combiner cavity is formed by pultrusion of aluminum alloy, and the surface is plated with tin, so that welding is facilitated.
Compared with the prior art, the utility model discloses a scheme has following advantage:
1. among the radio frequency circuit, utilize the spiral to open a way resonance minor matters and the folding line of walking of high frequency access transmission line, can further reduce radio frequency circuit's horizontal size effectively, reduced its self cost, and the spiral is opened a way the outband zero point that resonance minor matters produced, helps improving the outband and restraines.
2. Among the radio frequency circuit, close way matching transmission line and high frequency path transmission line wide, help reducing radio frequency circuit's insertion loss.
Drawings
Fig. 1 is a schematic plan view of a PCB of the present invention;
fig. 2 is a side sectional view of the stripline combiner of the base station antenna of the present invention;
fig. 3 is a simulation result diagram of the present invention.
Description of reference numerals: 1-combiner cavity, 2-PCB, 3-combiner dielectric substrate, 11-signal combiner port, 22-high frequency signal port, 33-low frequency signal port, 100-combiner matching transmission line, 200-high frequency path transmission line, 300-low frequency path transmission line, 44-metalized via hole, 1001-first spiral open-circuit resonance stub, 1002-second spiral open-circuit resonance stub, 1003-third spiral open-circuit resonance stub, 1004-fourth spiral open-circuit resonance stub.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and therefore the drawings show only the constitution related to the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the terms "and", "and" include any and all combinations of one or more of the associated listed items.
In order to present more clearly the technical scheme of the utility model, the utility model discloses a take the base station antenna stripline combiner of using radio frequency circuit as an example, introduce comprehensively, systematically the technical scheme of the utility model. It should be noted that the present specification only illustrates some embodiments, and should not be considered as limiting the application scenario of the technical solution of the present invention.
Referring to fig. 1, fig. 2 and fig. 3, an embodiment of the present invention provides a stripline combiner for base station antennas of 703MHz-798MHz/885MHz-960MHz, which can be applied to a built-in combination of base station antennas. The strip line combiner is of a double-cavity structure, has an upper layer and a lower layer, comprises two combiner radio frequency circuits and is suitable for a dual-polarization base station antenna array. The stripline combiner comprises a combiner cavity 1, a PCB (printed Circuit Board) 2 and a combiner medium substrate 3. The radio frequency circuits are printed on the top and bottom of the PCB printed circuit board 2 and connected by the metallized via holes 44, and the PCB printed circuit board 2 is placed in the combiner cavity 1.
Specifically, in a preferred version of the embodiment of the present invention, the adjacent metalized via 44 is less than one eighth of the operating wavelength.
Specifically, in a preferred aspect of the embodiment of the present invention, the combiner medium substrate 3 is preferably air.
In the embodiment of the utility model provides an in the preferred scheme, combiner cavity 1 is by aluminum alloy pultrusion, and the surface electrotinning is convenient for weld. The PCB 2 has good anti-interference performance, and is beneficial to improving the intermodulation stability.
Specifically, in the embodiment of the present invention, the printed radio frequency circuit on the PCB 2, the radio frequency circuit includes the high frequency path transmission line 200, the low frequency path transmission line 300 and the combining matching transmission line 100, at least two spiral open-circuit resonance branches are provided on the high frequency path transmission line 200, and at least two spiral open-circuit resonance branches are provided on the low frequency path transmission line 300.
Preferably, in the embodiment of the present invention, the combining matching transmission line 100 is composed of at least two sections of transmission line folding traces with different widths. Those skilled in the art can set the specific number of the transmission lines in the combined matching transmission line 100 according to actual needs, as long as at least two transmission lines with different widths are ensured.
Preferably, in the embodiment of the present invention, the high-frequency path transmission line 200 is formed by folding and routing at least three transmission lines with different widths, and a spiral open-circuit resonant stub is disposed at a connection of any two transmission lines of the transmission lines with different widths. Those skilled in the art can set the specific number of transmission lines in the high-frequency transmission line 200 according to actual needs, as long as the folding routing of the transmission lines with at least three sections of different widths is ensured.
Preferably, in the embodiment of the present invention, the low frequency path transmission line 300 is composed of at least three transmission lines with different widths, and a spiral open-circuit resonance stub is disposed at a connection of any two sections of the transmission lines with different widths. Those skilled in the art can set the specific number of the transmission lines in the low-frequency path transmission line 300 according to actual needs, as long as the transmission line has at least three sections with different widths.
The combining matching transmission line 100, the low-frequency path transmission line 300 and the high-frequency path transmission line 200 are all composed of transmission lines with different lengths, and meanwhile, the high-frequency path transmission line 200 of the combining matching transmission line 100 is folded and routed, so that the impedance matching effect of the combiner is improved, the return loss is reduced, and meanwhile, the transverse size of the radio frequency circuit is effectively reduced.
Specifically, as shown in fig. 1, taking the embodiment of the present invention as an example, the combining matching transmission line 100 is formed by two sections of transmission lines with different widths. The high-frequency path transmission line 200 is formed by folding and routing three transmission lines with different widths, and accordingly, two spiral open-circuit resonance branches, namely a first spiral open-circuit resonance branch 1001 and a first spiral open-circuit resonance branch 1002, are arranged in the three transmission lines with different widths in the high-frequency path transmission line 200. The low-frequency path transmission line 300 is composed of three transmission lines with different widths, and accordingly, two spiral open-circuit resonance branches, namely a third spiral open-circuit resonance branch 1003 and a fourth spiral open-circuit resonance branch 1004, are arranged in the three transmission lines with different widths in the low-frequency path transmission line 300. The spiral open circuit resonance minor matters, the open circuit resonance minor matters of helical shape promptly, compare in prior art open circuit minor matters and can reduce radio frequency circuit's horizontal size more effectively, can produce out of band zero point simultaneously, promote out of band suppression.
Specifically, in the embodiment of the present invention, the radio frequency circuit includes a combining matching transmission line 100, a high frequency path transmission line 200, a low frequency path transmission line 300, a metalized via hole 44, a first spiral open-circuit resonance branch 1001, a second spiral open-circuit resonance branch 1002, a third spiral open-circuit resonance branch 1003, and a fourth spiral open-circuit resonance branch 1004. A radio frequency signal is input from the signal combining port 11, and when the radio frequency signal passes through the high-frequency path transmission line 200, a zero point generated by the first spiral open-circuit resonance branch 1001 and the second spiral open-circuit resonance branch 1002 suppresses 703MHz-798MHz frequency band signals and 885MHz-960MHz frequency band signals to reach the high-frequency signal port 22; when passing through the low-frequency path transmission line 300, the third spiral open-circuit resonance branch 1003 and the fourth spiral open-circuit resonance branch 1004 generate zero-point suppression signals of 885MHz-960MHz frequency band and signals of 703MHz-798MHz frequency band to reach the low-frequency signal port 33, so that the radio-frequency signal combining/splitting function is realized.
Meanwhile, the transmission line width of the combined matching transmission line 100 and the high-frequency path transmission line 200 is controlled to be wider, the transmission line width of the combined matching transmission line 100 and the high-frequency path transmission line 200 is larger than that of the low-frequency path transmission line 300, so that insertion loss is reduced, and the combined matching transmission line 100 and the high-frequency path transmission line 200 adopt a folding routing mode, can be matched with the spiral open-circuit resonance branch to further effectively reduce the transverse size of the radio frequency circuit, and reduce the cost of the radio frequency circuit.
Further, the spiral open-circuit resonant branches are arranged on the same side and/or different sides of the high-frequency path transmission line 200/the low-frequency path transmission line 300 and are isolated from each other by the high-frequency path transmission line 200/the low-frequency path transmission line 300, so that the stability of the circuit performance is improved.
It should be noted that, in other embodiments, the number of the spiral open-circuit resonant branches of the high-frequency path transmission line 200 and/or the low-frequency path transmission line 300 is not limited, as long as the number is at least two, which satisfies the path bandwidth requirement of the high-frequency path transmission line 200 and the low-frequency path transmission line 300.
As shown in fig. 3, the utility model discloses a transmission line walks the mode that the line is folding and applied the spiral resonance minor matters of opening a way, produces outband zero point, promotes the outband and restraines, has shortened the horizontal size of combiner simultaneously effectively, has reduced the cost of self. The return loss of the combiner in two working frequency bands of 703MHz-798MHz and 885MHz-960MHz is below-21 dB, the out-of-band rejection is below-28 dB, the in-band insertion loss is within-0.2 dB, the combiner has excellent overall electrical performance, high stability, simple structure, easy installation, small volume and low cost.
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 the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A radio frequency circuit is characterized by comprising a high-frequency path transmission line, a low-frequency path transmission line and a combining matching transmission line, wherein at least two spiral open-circuit resonance branches are arranged on the high-frequency path transmission line, and at least two spiral open-circuit resonance branches are arranged on the low-frequency path transmission line.
2. The RF circuit of claim 1, wherein the combining matching transmission line is formed by at least two transmission line folded traces with different widths.
3. The RF circuit according to claim 1, wherein the high-frequency path transmission line is formed by at least three transmission line folding traces with different widths, and a spiral open-circuit resonant branch is disposed at a connection of any two transmission lines of the at least three transmission lines with different widths.
4. The RF circuit of claim 1, wherein the low-frequency path transmission line comprises at least three transmission lines with different widths, and a spiral open-circuit resonant stub is disposed at a junction of any two of the at least three transmission lines with different widths.
5. A radio frequency circuit according to claim 1, wherein the open-circuited helical resonant stub is provided on the same side and/or on different sides of the high frequency path transmission line/the low frequency path transmission line, separated from each other by the high frequency path transmission line/the low frequency path transmission line.
6. The rf circuit of claim 1, wherein the transmission line width of the combined matching transmission line and the high frequency path transmission line is greater than the transmission line width of the low frequency path transmission line.
7. A stripline combiner for a base station antenna, the stripline combiner comprising a combiner cavity, a combiner dielectric substrate, and a PCB printed circuit board, further comprising a radio frequency circuit of any of claims 1-6, the radio frequency circuit being printed on the top and bottom of the PCB printed circuit board and connected by metallized vias, the PCB printed circuit board being disposed in the combiner cavity.
8. The base station antenna stripline combiner of claim 7, wherein adjacent metallized vias are less than one eighth of an operating wavelength.
9. The base station antenna stripline combiner of claim 7, wherein the combiner dielectric substrate is air.
10. The base station antenna stripline combiner of claim 7, wherein the combiner cavity is pultruded from an aluminum alloy, plated with tin on the surface to facilitate soldering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120539246.1U CN214756333U (en) | 2021-03-16 | 2021-03-16 | Radio frequency circuit and base station antenna strip line combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120539246.1U CN214756333U (en) | 2021-03-16 | 2021-03-16 | Radio frequency circuit and base station antenna strip line combiner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214756333U true CN214756333U (en) | 2021-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120539246.1U Active CN214756333U (en) | 2021-03-16 | 2021-03-16 | Radio frequency circuit and base station antenna strip line combiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214756333U (en) |
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2021
- 2021-03-16 CN CN202120539246.1U patent/CN214756333U/en active Active
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