Base station antenna phase shifter with out-of-band rejection function
By integrating the phase shifter and filter and using the design of PCB network and slides, the problem of lack of out-of-band suppression of traditional base station antenna phase shifters is solved, effective out-of-band suppression of the antenna is achieved, and the stability and reliability of the communication system are improved.
Patent Information
- Application Number
- CN202421559230.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-03
AI Technical Summary
Traditional base station antenna phase shifters lack out-of-band suppression function, resulting in an increase in the radiant energy of the antenna outside the operating frequency band, affecting the stability and reliability of the communication system.
The phase shifter and filter are integrated, and the power division circuit, phase shifter circuit and filter circuit are set up through the design of the PCB network and PCB slider. The design of two open filter lines is used to offset mismatched reflected waves, and the passband matching bandwidth and suppression bandwidth of the filter are improved.
Out-of-band suppression of the antenna is achieved, the volume and weight of the antenna is reduced, the design complexity and cost are reduced, and the stability and reliability of the communication system are improved.
Smart Images
Figure CN222839006U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of base station antennas and relates to a base station antenna phase shifter with an out-of-band suppression function. Background Art
[0002] In the field of wireless communication technology, base station antennas are an important part of the communication system, and their performance directly affects the quality of the communication system. Phase shifters are key components in base station antennas, used to change the phase of the antenna unit, achieve beam scanning and beamforming, and improve the coverage and capacity of the communication system.
[0003] However, traditional phase shifters usually do not have out-of-band suppression function, which will cause the antenna to radiate more energy outside the working frequency band, affecting the stability and reliability of the communication system. In the field of antenna design, with the increase of communication frequency and the growth of communication demand, the design of multi-frequency antennas has become more and more complicated. In order to meet the needs of multiple working frequency bands, the antenna needs to be configured with multiple phase shifters and filters, which not only increases the size and weight of the antenna, but also increases the complexity and cost of the design. In the field of electronic filtering technology, the main function of the filter is to suppress unwanted signals and improve the signal-to-noise ratio of the communication system. However, traditional filters are usually designed and used independently, which not only increases the complexity and PIM risk of the system, but also reduces the efficiency of the system.
[0004] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Utility Model Content
[0005] The utility model aims to provide a base station antenna phase shifter with an out-of-band suppression function, integrating the phase shifter and a filter together to solve at least one of the above technical problems.
[0006] The purpose of the utility model is achieved through the following technical solutions:
[0007] A base station antenna phase shifter with an out-of-band suppression function, comprising a PCB network and a PCB slide, wherein a power division circuit, a phase shift circuit and a filter circuit are arranged on the PCB network, wherein the power division circuit and the phase shift circuit are electrically connected via the PCB slide, and wherein the power division circuit and the filter circuit are electrically connected;
[0008] The filter circuit has two open filter lines, and the distance between the two open filter lines is 1 / 2 of the working frequency wavelength, so that the mismatched reflected waves brought by the two filter branches can offset each other, which is of great benefit to the passband matching bandwidth of the filter;
[0009] The length of one open-circuit filter line of the filter circuit is less than 1 / 4 wavelength of the center frequency of the filter segment, and the length of the other open-circuit filter line is greater than 1 / 4 wavelength of the center frequency of the filter segment. In this way, two resonance points can be formed in the frequency band that needs to be filtered, thereby improving the suppression bandwidth of the filter.
[0010] As a further improvement of an embodiment of the utility model, the phase shift circuit is located at the upper end of the PCB network, the filter circuit is located at the lower end of the PCB network, and the power division circuit is located in the area between the phase shift circuit and the filter circuit.
[0011] As a further improvement of an embodiment of the utility model, the phase shift circuit is composed of a first phase shifter module, a second phase shifter module and a third phase shifter module which are spaced apart from each other in an upper and lower manner, the first phase shifter module is applicable to a first phase shift amount, the second phase shifter module is applicable to a second phase shift amount, the third phase shifter module is applicable to a third phase shift amount, the first phase shift amount is greater than the second phase shift amount, and the second phase shift amount is greater than the third phase shift amount.
[0012] As a further improvement of an embodiment of the utility model, the passband of the base station antenna phase shifter is 1.427 GHz-2.69 GHz, and the stopband is 698 MHz-960 MHz.
[0013] As a further improvement of an embodiment of the utility model, the PCB network is provided with unit interfaces connected to two ends of the first phase shifter module, two ends of the second phase shifter module and two ends of the third phase shifter module.
[0014] As a further improvement of an embodiment of the utility model, the phase shift amount of the first phase shifter module is -180° to 180°, the phase shift amount of the second phase shifter module is -120° to 120°, and the phase shift amount of the third phase shifter module is -60° to 60°.
[0015] As a further improvement of an embodiment of the utility model, the two open-circuit filter circuits are distributed on both sides of the power division circuit, and one end of the power division circuit is connected to the line between the two open-circuit filter circuits; one end of the filter circuit is connected to a unit interface on the PCB network, and the other end of the filter circuit is connected to the antenna feeding end.
[0016] As a further improvement of an embodiment of the utility model, the open filter circuit has multiple sections of L-shaped bending circuits. The specifications and structures of the multiple sections of L-shaped bending circuits are not all the same, so that each open filter circuit is composed of multiple sections of irregular circuits, and the impedance distribution of the open filter circuit can be adjusted to achieve the effect of adjusting the passband matching and stopband suppression.
[0017] The above technical solution has the following beneficial effects:
[0018] 1. Integrated phase shifter and filter: Integrate the phase shifter and filter to form a composite device with out-of-band suppression function. This integrated design can not only reduce the size and weight of the antenna, reduce the complexity and cost of the design, but also improve the efficiency of the system.
[0019] 2. Optimized design: Through optimized design, the integrated phase shifter and filter can meet the needs of multiple operating frequency bands at the same time, avoiding the need to configure a phase shifter and filter for each operating frequency band, thereby further simplifying the antenna design.
[0020] 3. Improve reliability: Due to the integrated design of phase shifter and filter, the radiation energy of the antenna outside the working frequency band can be effectively suppressed, thereby improving the stability and reliability of the communication system.
[0021] 4. Flexible configuration: The integrated design of the phase shifter and filter in this technical solution allows us to flexibly configure and adjust the working frequency band according to actual needs without large-scale modification and redesign of the antenna, thereby greatly improving the flexibility and convenience of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0023] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0024] Figure 1 This is a schematic diagram of the planar structure provided by the utility model.
[0025] Figure 2 This is a detailed diagram of the plane structure provided by the utility model.
[0026] Figure 3 This is a schematic diagram of the passband standing wave provided by the utility model.
[0027] Figure 4 This is a schematic diagram of stopband suppression provided by the utility model.
[0028] In the figure:
[0029] 1-PCB network;
[0030] 2-filter circuit; 21, 22-open filter circuit;
[0031] 3-PCB slide;
[0032] 4-power division circuit;
[0033] 5-phase shifting circuit; 51-first phase shifter module; 52-second phase shifter module; 53-third phase shifter module;
[0034] 6-unit interface; 61-first unit interface; 62-second unit interface; 63-third unit interface; 64-fourth unit interface;
[0035] 7- Antenna feed terminal. DETAILED DESCRIPTION
[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0038] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0039] See also Figure 1-Figure 2 As shown, a base station antenna phase shifter with an out-of-band suppression function is composed of a PCB network 1 and a PCB slide 3, wherein a power division circuit 4, a phase shift circuit 5 and a filter circuit 2 are arranged on the PCB network 1, wherein the power division circuit 4 and the phase shift circuit 5 are electrically connected through the PCB slide 3, and the power division circuit 4 and the filter circuit 2 are electrically connected. By arranging the power division circuit 4, the phase shift circuit 5 and the filter circuit 2 on the PCB network 1 and coordinating the design with the PCB slide 3, the dual effects of phase shifting and filtering are achieved.
[0040] from Figure 1It can be seen that the phase shift circuit 5 is located at the upper end of the PCB network 1, the filter circuit 2 is located at the lower end of the PCB network 1, and the power division circuit 4 is located in the area between the phase shift circuit 5 and the filter circuit 2. A number of unit interfaces 6 connected to the power division circuit 4 and the phase shift circuit 5 are arranged on both sides of the PCB network 1, and one end of the filter circuit 2 is connected to the antenna feed end 7. The above-mentioned unit interface 6 is the output end of the phase shifter, which is used to connect the vibrator.
[0041] The utility model integrates a phase shifter and a filter to form a base station antenna phase shifter. The base station antenna phase shifter adds a filter circuit on the basis of the original phase shift circuit, thereby effectively solving the problem that the traditional phase shifter has no out-of-band suppression function, reducing the radiation energy of the antenna outside the working frequency band, improving the stability and reliability of the communication system, and greatly simplifying the design of multi-frequency antennas, reducing the size and weight of the antenna, and reducing the complexity and cost of the design.
[0042] The phase shift circuit 5 in the utility model is composed of a first phase shifter module 51, a second phase shifter module 52 and a third phase shifter module 53 which are spaced apart from each other in an upper and lower direction, wherein the first phase shifter module 51 is suitable for a first phase shift amount, the second phase shifter module 52 is suitable for a second phase shift amount, and the third phase shifter module 53 is suitable for a third phase shift amount, and a first unit interface 61 connected to both ends of the first phase shifter module 51, a second unit interface 62 connected to both ends of the second phase shifter module 52 and a third unit interface 63 connected to both ends of the third phase shifter module 53 are arranged on the PCB network 1.
[0043] Specifically, the arc of the first phase shifter module 51 is -180° to 180°, the arc of the second phase shifter module 52 is -120° to 120°, and the arc of the third phase shifter module 53 is -60° to 60°. Since a larger arc represents a larger phase shift, the first phase shift is greater than the second phase shift, and the second phase shift is greater than the third phase shift.
[0044] The filter circuit 2 of the utility model has two open filter circuits 21 and 22, and the two open filter circuits 21 and 22 are distributed on both sides of the power distribution circuit 4. Figure 1 It can be seen that one end of the power division circuit 4 is connected to the line between the two open-circuit filter lines 21 and 22, and the other end of the power division circuit 4 is connected to the fourth unit interface 64 on the PCB network 1; one end of the filter circuit 2 is connected to the antenna feed terminal 7.
[0045] In the utility model, the spacing between the two open-circuit filter circuits 21 and 22 is 1 / 2 of the wavelength of the working frequency, so that the mismatched reflected waves brought by the two filter branches can offset each other, which is of great benefit to the passband matching bandwidth of the filter. The length of one open-circuit filter circuit 21 of the filter circuit 2 is less than 1 / 4 of the wavelength of the center frequency of the filter section, and the length of the other open-circuit filter circuit 22 is greater than 1 / 4 of the wavelength of the center frequency of the filter section, so that two resonance points can be formed in the frequency band that needs to be filtered, thereby improving the suppression bandwidth of the filter. At the same time, the above-mentioned open-circuit filter circuits 21 and 22 have multiple sections of L-shaped bending circuits. The specifications and structures of the above-mentioned multiple sections of L-shaped bending circuits are not all the same, so that each open-circuit filter circuit is composed of multiple sections of irregular circuits, and the impedance distribution of the open-circuit filter circuit can be adjusted to achieve the effect of adjusting the passband matching and stopband suppression.
[0046] Through the filter circuit 2 designed as above, the filter can achieve out-of-band suppression, a large frequency span and a relatively wide bandwidth. Example
[0047] PCB network 1 uses a PCB with a thickness of 1.524 mm and a dielectric constant of 3.0; the PCB slide uses FR4 (epoxy resin board) with a thickness of 0.5 mm and a dielectric constant of 4.4.
[0048] Using the technology of this utility model, a base station antenna phase shifter with a passband of 1.427GHz-2.69GHz and a stopband of 698MHz-960MHz with out-of-band suppression function is designed. The simulation performance results are shown below. Figure 3 , Figure 4 ,As can be seen from the figure, under the condition of maintaining the original performance of the phase shifter, 15dB of out-of-band suppression is achieved, and the integrated collaborative design of the filter and phase shifter is realized, which provides design convenience for multi-frequency antennas.
[0049] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A base station antenna phase shifter with out-of-band suppression function, characterized in that: It is composed of a PCB network and a PCB slide, wherein a power division circuit, a phase shift circuit and a filter circuit are arranged on the PCB network, the power division circuit and the phase shift circuit are electrically connected through the PCB slide, and the power division circuit and the filter circuit are electrically connected; The filtering circuit has two open-circuit filtering lines, the spacing between the two open-circuit filtering lines is 1 / 2 of the working frequency wavelength, the length of one open-circuit filtering line is less than 1 / 4 of the wavelength of the center frequency of the filtering section, and the length of the other open-circuit filtering line is greater than 1 / 4 of the wavelength of the center frequency of the filtering section.
2. The base station antenna phase shifter according to claim 1, characterized in that: The phase shift circuit is located at the upper end of the PCB network, the filter circuit is located at the lower end of the PCB network, and the power division circuit is located in the area between the phase shift circuit and the filter circuit.
3. The base station antenna phase shifter according to claim 2, characterized in that: The phase shift circuit consists of a first phase shifter module, a second phase shifter module and a third phase shifter module which are spaced apart from each other. The first phase shifter module is suitable for a first phase shift amount, the second phase shifter module is suitable for a second phase shift amount, and the third phase shifter module is suitable for a third phase shift amount. The first phase shift amount is greater than the second phase shift amount, and the second phase shift amount is greater than the third phase shift amount.
4. The base station antenna phase shifter according to claim 1, characterized in that: The base station antenna phase shifter has a passband of 1.427 GHz to 2.69 GHz and a stopband of 698 MHz to 960 MHz.
5. The base station antenna phase shifter according to claim 3, characterized in that: The PCB network is provided with unit interfaces connected to two ends of the first phase shifter module, two ends of the second phase shifter module and two ends of the third phase shifter module.
6. The base station antenna phase shifter according to claim 3, characterized in that: The phase shift amount of the first phase shifter module is from -180° to 180°, the phase shift amount of the second phase shifter module is from -120° to 120°, and the phase shift amount of the third phase shifter module is from -60° to 60°.
7. The base station antenna phase shifter according to claim 2, characterized in that: The two open-circuit filter circuits are distributed on both sides of the power division circuit, and one end of the power division circuit is connected to the line between the two open-circuit filter circuits; one end of the filter circuit is connected to a unit interface on the PCB network, and the other end of the filter circuit is connected to the antenna feeding end.
8. The base station antenna phase shifter according to claim 2, characterized in that: The open filter circuit has multiple sections of L-shaped bending circuits.