CN107546489B - Multi-frequency base station antenna for eliminating coupling resonance - Google Patents
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Abstract
The invention provides a multi-frequency base station antenna for eliminating coupling resonance, which comprises a reflecting plate, a first low-frequency radiation array, a second low-frequency radiation array and a first high-frequency radiation array, wherein the first low-frequency radiation array and the second low-frequency radiation array are arranged on the reflecting plate, are parallel to each other and are arranged on the same radiation surface; the first and second low-frequency radiating arrays comprise a plurality of low-frequency radiating elements, and the first high-frequency radiating array comprises a plurality of first high-frequency radiating elements; the high-frequency radiating unit further comprises a spacer bar which is parallel to the reflecting plate and insulated from the reflecting plate, extends along the central axes of the first and second low-frequency radiating arrays, and is positioned between the radiating surfaces of the first and second low-frequency radiating units. The invention reduces the mutual coupling among the arrays, achieves the technical effects of improving the isolation among the arrays and reducing the resonance generation among the arrays.
Description
Technical Field
The invention relates to the field of communication base station antennas, in particular to a multi-frequency base station antenna for eliminating coupling resonance between different systems in a multi-frequency antenna array.
Background
The main transmission path of electromagnetic interference between radio systems is coupling between antennas. Isolation is often used to quantitatively characterize the strength of this coupling, which is defined as the ratio of the transmitted power of one antenna to the received power of another antenna, expressed in dB.
With the increase of mobile communication network systems, a base station antenna is required to support multiple communication systems, so as to save station and antenna feed resources, reduce the difficulty of property coordination, reduce investment cost, and gradually become the first choice for operators to establish networks.
Due to the shortage of space resources of the site, the miniaturization, multi-system and broadband of the multi-frequency base station antenna becomes the mainstream of development. The layout of devices in the multi-frequency base station antenna is more and more compact, the radiation oscillator units are closer and closer, and the enhancement of mutual coupling among arrays can not only cause the distortion of an array directional diagram, but also influence the beam forming of the array antenna; it also causes strong coupling interference between different array systems, resulting in poor isolation between systems and interference with different channel communications.
According to the antenna theory and technology knowledge, the following characteristics are obtained: the array elements are placed in parallel and the closer the pitch, the stronger the coupling field. The conventional method for improving the isolation between different systems of the multi-frequency base station antenna is to stagger the front triangle and the rear triangle of two adjacent lines, so that the parallel arrangement is avoided on one hand, and the distance between different arrays is improved on the other hand. However, the method has no effect on a low-frequency band (690-960MHz) system with longer wavelength, and the low-frequency band array interval is not opened by much space inside the multi-frequency base station antenna. The addition of a metal plate higher than the radiating surface of the oscillator between two low-frequency array systems can also weaken the coupling of the radiating field between the arrays and improve the isolation between the systems, but the method seriously affects the array radiation pattern, thereby causing cross polarization deterioration and horizontal plane pattern deformity. The solutions in the prior art are the following: (1) isolation resonance interference caused by mutual coupling between high frequency and low frequency is eliminated by specially designing the high frequency and low frequency oscillator units, but when the high frequency oscillator units deviate from the optimal design size, namely the high frequency radiating unit is too large or too small, the performance of the high frequency radiating unit is reduced. (2) In a decoupling slot unit loaded between two columns of low-frequency radiating arrays and having a periodic arrangement structure, the decoupling slot boundary can only be applied to a MIMO array antenna which has no radiating element between two columns of radiating elements and is only suitable for working in the same frequency band. (3) An array antenna operating at dual high frequencies plus one low frequency is provided which acts to improve beam convergence characteristics and to block mutual coupling between the high frequency and low frequency arrays, thereby affecting low frequency beam convergence characteristics, but is not suitable for use with multi-frequency antennas operating in more systems, particularly in side-by-side array layouts with more than two high frequencies plus two low frequencies. (4) For a base station antenna with two left and right columns of low-frequency radiation arrays and a high-frequency radiation array shoulder-to-shoulder array layout arranged between the two low-frequency radiation arrays, or a high-frequency and low-frequency side-to-shoulder array layout, a technical means of full insulation or a technical means of no insulation of the high-frequency radiation arrays is usually adopted. The technical effect of adopting the all-insulation technical means is that the technical effect of eliminating resonance can be achieved, but the radiation performance of the low-frequency radiation array, such as the front-to-back ratio and the isolation between the arrays, can not be improved by utilizing the coupling of high frequency and low frequency; if the technical means of complete insulation is adopted, the technical effect is that the radiation performance of the low-frequency radiation array can be improved by utilizing the coupling of high frequency and low frequency, but the aim of eliminating resonance cannot be achieved.
For the above scheme (4), on one hand, due to the requirement of miniaturization design of the antenna, the radiation unit spacing of different working systems of the multi-frequency antenna is smaller and smaller, the coupling field is also stronger and stronger, and the low-frequency radiation units on the two sides and the middle high-frequency radiation unit are arranged in parallel, and the adjacent radiation units are located in the maximum radiation direction and have larger mutual impedance value than the coaxial arrangement. In particular, the middle row of high frequency radiating arrays is located in the middle of the coupling fields of the two rows of low frequency radiating arrays, resulting in the more serious mutual coupling of the three systems, the total coupling field Z of whichtFor coupling the field Z between a high frequency and two low frequencies21And low frequency coupling field Z21The superposition of's. The superimposed field influences the low-frequency radiation performance of the left and right columns and the high-frequency radiation performance of the middle column.
On the other hand, the high-frequency radiating element forms a spatial parasitic resonator for the low-frequency radiating element. The high-frequency radiation array not only has the current working in a high-frequency band, but also has the parasitic current of a coupling field of the left and right low-frequency radiation units on the high-frequency unit, the parasitic radiation field is superposed with the radiation fields of the left and right low-frequency arrays, the front-to-back ratio radiation performance of the left and right low-frequency arrays is improved, the resonance of the isolation between the two low-frequency arrays at the two sides is caused, and the isolation between the two low-frequency radiation arrays is deteriorated. In a multi-frequency antenna system, high system isolation between different systems is required, so that the systems do not interfere with each other.
In summary, for a base station antenna with two left and right columns of low-frequency radiating arrays and a high-frequency radiating array arranged in the middle thereof in a shoulder-to-shoulder array layout, or a shoulder-to-shoulder array layout with two or more high frequencies and two or more low frequencies, in the prior art, the technical problems of eliminating resonance and improving the radiation performance of the low-frequency radiating arrays by using the coupling of the high and low frequencies cannot be solved at the same time.
Disclosure of Invention
The invention aims to provide a multi-frequency base station antenna for eliminating coupling resonance, so as to reduce mutual coupling among arrays, improve the isolation among the arrays and reduce the technical effect of resonance generation among the arrays.
A multi-frequency base station antenna for eliminating coupling resonance comprises a reflecting plate, a first low-frequency radiation array, a second low-frequency radiation array and a first high-frequency radiation array, wherein the first low-frequency radiation array and the second low-frequency radiation array are arranged on the reflecting plate, are parallel to each other and are arranged on the same radiation surface; the first and second low-frequency radiating arrays comprise a plurality of low-frequency radiating elements, and the first high-frequency radiating array comprises a plurality of first high-frequency radiating elements; the high-frequency radiating unit further comprises a spacer bar which is parallel to the reflecting plate and insulated from the reflecting plate, extends along the central axes of the first and second low-frequency radiating arrays, and is positioned between the radiating surfaces of the first and second low-frequency radiating units.
Preferably, the shape of the isolating strip is linear or in a shape of a bow.
Preferably, the isolation strip is an aluminum alloy or a PCB structure.
Preferably, the actual length of the isolating strip is 0.25-0.5 times of the wavelength of the low-frequency resonance frequency point.
Preferably, the width of the isolating strip is 0.01-0.05 times of the wavelength of the low-frequency resonance frequency point.
Preferably, the spacer is located above the first high frequency radiating array.
Preferably, the isolation bar is located below the inner oscillator arms of the first and second low-frequency radiating elements or between the oscillator arm of the first low-frequency radiating element and the adjacent oscillator arm of the first high-frequency radiating element or between the oscillator arm of the second low-frequency radiating element and the adjacent oscillator arm of the first high-frequency radiating element.
Preferably, the first and second electrodes are formed of a metal,
the vertical distance between the isolating strip and the plane where the oscillator arms of the first low-frequency radiating unit and the second low-frequency radiating unit are located is 0.01-0.05 times of the wavelength of the low-frequency resonance frequency point, and the distance between the isolating strip and the reflecting plate is 0.2-0.25 times of the wavelength of the low-frequency resonance frequency point.
Preferably, the number of the spacers is [1, n/2], and n is the number of the first high-frequency radiating elements. With reference to the above preferred embodiment, the multi-frequency base station antenna for eliminating coupling resonance may further include at least one first high-frequency radiation unit, which is insulated from the reflection plate, and the first high-frequency radiation unit, which is insulated from the reflection plate, is located in a central section of the first high-frequency radiation array, where the number of the first high-frequency radiation units and the number of the reflection plate, which are insulated from each other, are [1, n/2], and n is the number of the first high-frequency radiation units. Preferably, an insulating ring is mounted at a fastening place between the first high-frequency radiation unit and the reflection plate.
In combination with the above preferred solution, the multi-frequency base station antenna for eliminating coupling resonance further includes a second high-frequency radiation unit nested in the first and second low-frequency radiation units, and/or a third high-frequency radiation unit disposed between two adjacent low-frequency radiation units in the same array. Compared with the prior art, the scheme of the invention has the following advantages:
according to the multi-frequency base station antenna for eliminating coupling resonance, the isolation strip is additionally arranged between the high-frequency array and the low-frequency array, so that mutual coupling between the two arrays is reduced, the isolation between array systems is improved, and the coupling resonance between the arrays is eliminated on the premise of not influencing the radiation performance of the base station antenna. The technical scheme of the invention has simple implementation method and obvious effect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic perspective view of a multi-frequency base station antenna according to the present invention;
fig. 2 is a side view of the multi-frequency base station antenna of fig. 1;
fig. 3 is a schematic perspective view of a multi-frequency base station antenna according to a first embodiment of the present invention;
fig. 4 is a side view of a schematic perspective view of the multi-frequency base station antenna shown in fig. 3;
fig. 5 is a schematic perspective view of a multi-frequency base station antenna according to a second embodiment of the present invention;
fig. 6 is a side view of the multi-frequency base station antenna of fig. 5;
fig. 7 is a schematic perspective view of a multi-frequency base station antenna according to a third embodiment of the present invention;
fig. 8 is a side view of the multi-frequency base station antenna of fig. 7;
fig. 9 is a schematic perspective view of a multi-frequency base station antenna according to a fourth embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention provides a multi-frequency base station antenna for eliminating coupling resonance aiming at two parallel low-frequency radiation arrays and a base station antenna of a high-frequency radiation array in the middle of the two parallel low-frequency radiation arrays, and solves the technical problem that the resonance elimination and the improvement of the radiation performance of the low-frequency radiation array by using the coupling of high and low frequencies cannot be achieved simultaneously in the prior art.
As shown in fig. 1-2, a multi-frequency base station antenna according to the present application includes a reflection plate 100, two left and right low-frequency radiation arrays on the same radiation plane, and one high-frequency radiation array disposed therebetween, where the two low-frequency radiation arrays are parallel to each other, and for convenience of description, the two low-frequency radiation arrays are defined as a first low-frequency radiation array 200 and a second low-frequency radiation array 300, the high-frequency radiation array is a first high-frequency radiation array 400, and the three radiation arrays are axially parallel to each other. The first low-frequency radiating array 200 includes a plurality of first low-frequency radiating elements 201, the second low-frequency radiating array 300 includes a plurality of second low-frequency radiating elements 301, and the first high-frequency radiating array 400 includes a plurality of first high-frequency radiating elements 401.
For the array structure of the base station antenna of the present invention, the first high frequency radiating array 400 forms a kind of spatial parasitic resonator for the first and second low frequency radiating arrays 200, 300. The first high-frequency radiating array 400 not only has currents working in a high-frequency band, but also has parasitic currents of coupling fields on the first high-frequency radiating array 400 by the first and second low-frequency radiating arrays 200 and 300 on the left and right sides thereof, and the parasitic currents can improve the generation of parasitic radiating fields in space, and the parasitic radiating fields are superposed with the radiating fields of the first and second low-frequency radiating arrays 200 and 300, so that the front-to-back ratio radiation performance of the first and second low- frequency radiating arrays 200 and 300 is improved, but resonance of the isolation between the first and second low- frequency radiating arrays 200 and 300 is caused, and the isolation between the first and second low- frequency radiating arrays 200 and 300 is deteriorated. In a multi-frequency antenna system, higher system isolation is required among different systems, so that the effect of mutual noninterference is achieved.
In order to solve the above problem, the multi-frequency base station antenna further includes a separation strip 500 disposed between the arrays, wherein the separation strip 500 is fixedly connected to and supported by the reflection plate 100 by at least two support columns 501 made of insulating material. The connection mode of the isolation strip 500 and the insulation support column 501 may be insertion connection, preferably, two ends of the isolation strip 500 are provided with two openings, and the insulation support column 501 is inserted in the opening of the isolation strip 500. The insulating support column 501 and the reflection plate 100 may be connected by a conventional connection method such as screw fastening and plugging. The division bar 500 is preferably an aluminum alloy or PCB plate structure.
The isolation bars 500 are parallel to the first and second low frequency radiating arrays 200, 300. Along the extension direction of the first and second low frequency radiation arrays 200, 300, the isolation strip 500 is located in the central section of the first and second low frequency radiation arrays 200, 300, which may be 1/3-1/2 central section of the first and second low frequency radiation arrays 200, 300. The height of the isolation bar 500 is located between the radiation surface of the first high-frequency radiation unit 401 and the radiation surfaces of the first and second low- frequency radiation units 201 and 301, the height of the isolation bar 500 is defined as H, the height of the radiation surface of the first and second low- frequency radiation units 201 and 301 relative to the reflector plate is H1, the height of the radiation surface of the first high-frequency radiation unit 401 relative to the reflector plate is H2, and the range of the height H of the isolation bar 500 is H1> H2. The horizontal extent of the isolating bar 500 is between the central axes of the first and second low frequency radiating arrays 200, 300, i.e. within the dashed box area a as shown in fig. 2.
The first high frequency radiating array 400 is located in the middle of the coupling fields of the first and second low frequency radiating arrays 200, 300, resulting in the mutual coupling of the three more serious systems, wherein the total coupling field ZtFor coupling a field Z between the first high frequency radiating array 400 and the first and second low frequency radiating arrays 200, 30021And the first low-frequency radiating array 200 and the second low-frequency radiating array 300 are coupled by a field Z21The superposition of's. This superimposed field affects the radiation performance of the first and second low frequency radiating arrays 200, 300 and the first high frequency radiating array 400 in between. The isolation strip 500 eliminates total coupling field anti-Z by utilizing the position relationship between the isolation strip and the first high frequency radiation array 400 and the first and second low frequency radiation arrays 200 and 300t。
Specifically, the scheme is based on theoretical calculation conclusion: the half-wave oscillator mutual impedance shows a sharp reduction in a damping oscillation form along with the increase of the oscillator spacing. However, due to the requirement of miniaturization design of the antenna, the radiation units of different working systems of the multi-frequency antenna are closer and closer, and the coupling field is stronger and stronger; and the first and second low frequency radiating arrays 200, 300 and the first high frequency radiating array400 are arranged in parallel, adjacent radiating elements are positioned in the maximum radiation direction, and the stronger coupling is larger than the mutual impedance value of coaxial arrangement. In particular, the additional introduction of the isolation bars 500 as a coupling field quantity counteracts the original total coupling field ZtThe isolation between the arrays can be improved.
Since the lower frequency band (1710-1920MHz) of the operating frequency band (1710-2690MHz) of the first high-frequency radiation array 400 is about twice the higher frequency band (855-960MHz) of the operating frequency band (690-960MHz) of the first and second low- frequency radiation arrays 200, 300, especially the isolation of the first and second low- frequency radiation arrays 200, 300 around 852MHz generates resonance, in this embodiment, the low-frequency resonance frequency point is 852MHz, but it is not limited to that the low-frequency resonance frequency point is 852MHz, and may also be in the range of 690-960 MHz. In this regard, the present application provides that, based on the above solution, at least two specific embodiments may be extended:
in the first embodiment, the isolation bars 500 are used to eliminate the partial coupling mutual impedance Z in the range of the dotted line frame region atWhich is provided in the space above the first high-frequency radiating array 400 in the intermediate position, as shown in fig. 3 to 4. The isolation strip 500 can eliminate the coupling field Z between the first high frequency radiating array 400 and the first and second low frequency radiating arrays 200, 30021Therefore, the radiation performance of the first high-frequency radiation array 400 and the first and second low- frequency radiation arrays 200 and 300 is improved, the generation of resonance among the arrays is reduced, and the isolation among the arrays is improved. The width of the isolating strip 500 is 0.01-0.05 times of the wavelength of the low-frequency resonance frequency point, and the distance between the isolating strip and the reflecting plate 100 is 0.2-0.25 times of the wavelength of the low-frequency resonance frequency point. The isolation bar 500 is small enough for the projection plane of the first high-frequency radiating array 400, so as not to block the first high-frequency radiating unit 401 and not to affect the electromagnetic radiation performance of the first high-frequency radiating unit 401.
In the second embodiment, within the range of the dashed-line frame region a, the isolation bar 500 is located below the inner vibrator arms of the first and second low- frequency radiating elements 201 and 301, the vibrator arm of the first low-frequency radiating element 201, and the first high-frequency radiating element401 or the dipole arm of the second low-frequency radiating element 301 and the dipole arm of the first high-frequency radiating element 401, as shown in fig. 5-6. In this embodiment, the isolation strip 500 is used to introduce parasitic coupling to change the current distribution of the oscillator, so as to change the radiation impedance Z of the resonant frequency point of the first and second low- frequency radiation arrays 200 and 300r＝RrA reactive component jX of + jX, which alters a coupling field Z between the first high frequency radiating array 400 and the first and second low frequency radiating arrays 200, 30021And a coupling field Z between the first low frequency radiating array 200 and the second low frequency radiating array 30021'. In particular, the coupling field mutual impedance Z between the originally different arrays is directly changed21Value of total coupling field ZtThe superposition of the original resonance frequency points is avoided, a certain reverse phase offset is generated, and the isolation between the arrays is improved.
The vertical distance between the isolating strip 500 and the plane where the oscillator arms of the first and second low- frequency radiating units 201 and 301 are located is 0.01-0.05 times of the wavelength of the low-frequency resonance frequency point, and the distance between the isolating strip 500 and the reflecting plate 100 is 0.2-0.25 times of the wavelength of the low-frequency resonance frequency point.
For the first and second embodiments, the shape of the isolation strip 500 is linear or "bow" shaped, or may be other shapes, and the actual length is 0.25 to 0.5 times the wavelength of the low frequency resonance center point, and the width is 0.01 to 0.05 times the wavelength of the low frequency resonance center point. The isolation strip 500 is inserted into the entire multi-frequency array coupling field, and a kind of anti-phase cancellation is formed by the parasitic coupling field of the isolation strip 500 and the coupling field not loaded with the isolation strip 500. The first embodiment and the second embodiment may be used alone or in combination, that is, one or more of the separation bars 500 are disposed in the dashed box area a. When there is only one isolation strip 500, it is located above the first high-frequency radiating element 401 or located between the adjacent first and second low- frequency radiating elements 201 and 301, and directly below one of the oscillator arms, or located between the oscillator arms of the first and second low- frequency radiating elements 201 and 301 and the oscillator arm of the adjacent first high-frequency radiating element 401. When a plurality of isolation bars 500 are provided, they are located above the first high-frequency radiating unit 401 and/or below the inner dipole arms of the first and second low- frequency radiating units 201 and 301 and/or between the dipole arms of the first and second low- frequency radiating units 201 and 301 and the respective neighboring dipole arms of the first high-frequency radiating unit 401. But the number of the barrier ribs 500 is not more than half of the number n of the first high-frequency radiating elements 401.
Since the first high-frequency radiating array 400 and the first and second low- frequency radiating arrays 200 and 300 partially satisfy the resonance condition, especially when the first high-frequency radiating element 401 is directly electrically connected to the reflection plate 100 to form a direct current through connection, according to the mirror image principle, the first high-frequency radiating element 401 is a monopole parasitic radiating element with 1/4 wavelengths of the first and second low- frequency radiating arrays 200 and 300, and the first high-frequency radiating array 401 simultaneously generates a parasitic radiating field, which has the strongest coupling field strength and interferes with the performance of the first and second low- frequency radiating elements 201 and 301 of the first and second low- frequency radiating arrays 200 and 300.
Further, on the basis of the above-described embodiment, the present invention provides a third embodiment in which, as shown in fig. 7 to 8, the first high-frequency radiation unit 401 located at the central section of the first high-frequency radiation array 400 is provided to be insulated from the reflection plate 100. The central section may be a central section of 1/3-1/2 of the first and second low frequency radiating arrays 200, 300. Since the first high-frequency radiating element 401 is insulated from the reflecting plate 100, such parasitic radiation current is cut off, the electromagnetic resonance condition cannot be satisfied, and the mutual impedance Z between the first high-frequency radiating array 400 and the first and second low- frequency radiating arrays 200 and 300 is low21' mutual impedance Z between the first and second low-frequency radiating arrays 200, 30021A kind of cancellation can be formed. This approach does not affect the circuit and radiation performance of the first high frequency radiating array 400.
In the third embodiment, the insulation manner is specifically that a hole is dug at the installation position of the reflection plate 100 corresponding to the first high-frequency radiation unit 401 to be insulated, and the first high-frequency radiation unit is fixed on the reflection plate 100 through an insulation ring 600 made of plastic such as POM, so that the first high-frequency radiation unit is not directly electrically connected with the reflection plate 100. The number of high-frequency radiation elements insulated from the reflecting plate is one or more, but the number is less than half of the total number n of the first high-frequency radiation elements 401 in the first high-frequency radiation array 400.
The third embodiment can be used with the first or the second embodiment respectively, or the three embodiments can be used simultaneously, so as to reduce the influence on the first high-frequency radiation array 400 or the first and the second low- frequency radiation arrays 200 and 300, and the combined use of the three schemes does not interfere with each other, and the purpose of eliminating the coupling resonance can be realized.
The array structure of the base station antenna of the present invention is not limited to the array combination manner shown in fig. 3 to 8 — it is only composed of the first high frequency radiation array 400 and the first and second low frequency radiation arrays 200 and 300 in parallel. In the fourth embodiment, the multi-frequency base station antenna for eliminating coupling resonance further includes a third high-frequency radiating element 800 nested between the second high-frequency radiating element 700 in the first and second low- frequency radiating elements 201 and 301 and the adjacent low-frequency radiating element in the same array, as shown in fig. 9.
According to the invention, by loading the isolating bars 500 and/or the first high-frequency radiating units 401 in the first high-frequency radiating array 400 and the first and second low- frequency radiating arrays 200 and 300 and insulating the reflecting plate 100, mutual impedance between the arrays is offset on the premise of not influencing the radiation performance of the base station antenna, and mutual coupling between the arrays is reduced, so that the technical effects of improving isolation between the arrays and reducing resonance between the arrays are achieved. Therefore, the invention overcomes the problems that the layout of the internal devices of the antenna is compact and the radiating element units are closer and closer due to the miniaturization, multi-system and broadband of the multi-frequency base station antenna, so that the mutual coupling between the arrays is enhanced, the array directional diagram is distorted, and the beam forming of the array antenna is influenced; and the technical problems of poor isolation between systems, interference of different channel communication and the like caused by strong coupling interference between different array systems are avoided.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A multi-frequency base station antenna for eliminating coupling resonance comprises a reflecting plate, a first low-frequency radiation array, a second low-frequency radiation array and a first high-frequency radiation array, wherein the first low-frequency radiation array and the second low-frequency radiation array are arranged on the reflecting plate, are parallel to each other and are arranged on the same radiation surface; the first and second low-frequency radiating arrays comprise a plurality of low-frequency radiating elements, and the first high-frequency radiating array comprises a plurality of first high-frequency radiating elements; the method is characterized in that:
the high-frequency radiating array further comprises a spacing strip which is parallel to the reflecting plate and insulated from the reflecting plate, the spacing strip extends along the central axes of the first low-frequency radiating array and the second low-frequency radiating array, and the height of the spacing strip is between the height of the radiating surface of the first high-frequency radiating unit and the height of the radiating surfaces of the first low-frequency radiating unit and the second low-frequency radiating unit.
2. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the shape of the isolating strip is linear or in a bow shape.
3. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the isolating strip is an aluminum alloy or a PCB structure.
4. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the actual length of the isolating strip is 0.25-0.5 times of the wavelength of the low-frequency array resonance frequency point.
5. The multi-frequency base station antenna for eliminating coupling resonance according to any one of claims 1 or 4, wherein: the width of the isolating strip is 0.01-0.05 times of the wavelength of the low-frequency array resonance frequency point.
6. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the isolation strip is located above the first high-frequency radiation array.
7. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the isolation strip is located below the inner oscillator arms of the first and second low-frequency radiating units or between the oscillator arm of the first low-frequency radiating unit and the adjacent oscillator arm of the first high-frequency radiating unit or between the oscillator arm of the second low-frequency radiating unit and the adjacent oscillator arm of the first high-frequency radiating unit.
8. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 7, wherein: the vertical distance between the isolating strip and the plane where the oscillator arms of the first low-frequency radiating unit and the second low-frequency radiating unit are located is 0.01-0.05 times of the wavelength of the low-frequency resonance frequency point, and the distance between the isolating strip and the reflecting plate is 0.2-0.25 times of the wavelength of the low-frequency resonance frequency point.
9. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the number of the isolating bars is [1, n/2], and n is the number of the first high-frequency radiating units.
10. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, 6 or 7, wherein: at least one first high-frequency radiation unit is arranged in an insulating mode with the reflecting plate, the first high-frequency radiation unit arranged in the insulating mode with the reflecting plate is located in the central section of the first high-frequency radiation array, the number of the first high-frequency radiation units arranged in the insulating mode with the reflecting plate is [1, n/2], and n is the number of the first high-frequency radiation units.
11. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 10, wherein: an insulating ring is arranged at the fastening position between the first high-frequency radiation unit and the reflecting plate.
12. The multi-frequency base station antenna for eliminating coupling resonance as claimed in claim 1, wherein: the high-frequency radiating element also comprises a second high-frequency radiating element nested in the first low-frequency radiating element and the second low-frequency radiating element and/or a third high-frequency radiating element arranged between two adjacent low-frequency radiating elements in the same array.
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| CN108923116B (en) * | 2018-06-29 | 2021-03-19 | 京信通信技术(广州)有限公司 | High-frequency radiation unit and multi-frequency array antenna |
| CN110931952B (en) | 2018-09-20 | 2021-12-24 | 上海华为技术有限公司 | Multi-frequency antenna and communication device |
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