CN211320314U - Dual-polarized base station radiating array with high gain and high frequency trapped wave - Google Patents
Dual-polarized base station radiating array with high gain and high frequency trapped wave Download PDFInfo
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- CN211320314U CN211320314U CN201922156440.7U CN201922156440U CN211320314U CN 211320314 U CN211320314 U CN 211320314U CN 201922156440 U CN201922156440 U CN 201922156440U CN 211320314 U CN211320314 U CN 211320314U
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Abstract
The utility model is suitable for a base station antenna equipment technical field provides a dual polarization base station radiation array with high-gain and high frequency trapped wave, including: a reflective backplane; at least one low-frequency radiation oscillator fixedly arranged on the reflection bottom plate; the four high-frequency radiation arrays are fixedly arranged on the reflection bottom plate and uniformly surround the periphery of the low-frequency radiation arrays; at least four metal wires are respectively and independently and symmetrically erected on the supporting frames distributed around the low-frequency radiation array. Therefore, the utility model discloses the effect of parasitic radiation antenna has been played to the wire that sets up all around at low frequency antenna array, and the radiation field that this parasitic antenna produced and the radiation field that the low frequency array produced superpose mutually, under the condition that does not influence nested layout scheme, make full use of space resource improves the gain of low frequency antenna.
Description
Technical Field
The utility model relates to a base station antenna equipment technical field especially relates to a dual polarization base station radiation array with high gain and high frequency trapped wave.
Background
With the increasing improvement of the construction of the global communication field, a mobile communication system is a 2G/3G/4G multi-system coexistence system at present, and the mobile communication system also coexists with a 5G system in the future, and in order to reduce the network construction and operation maintenance cost and consider the evolvable performance of a network in the later period for a long time, operators put higher demands on the broadband, miniaturization and multi-system of an antenna. One antenna is required to meet more network standards, cover all mobile communication frequency bands which are available and may be used in the future, and the antenna is required to be small in size so as to facilitate site selection of a base station and save space resources. Therefore, there is a need for the research of multi-frequency, wideband, and miniaturized base station antenna technology, and the array antenna of the high-low frequency nested scheme is one of the main paths for realizing miniaturization.
In the existing base station array antenna, a high-frequency radiation array and a low-frequency radiation array are often required to be installed on a floor together, so that the multi-system and miniaturization of an antenna system are realized. In order to reduce the shielding of the high frequency radiation unit by the low frequency radiation unit, a cross array with ± 45 ° polarization synthesized by a horizontal radiation unit and a vertical radiation unit is proposed in the prior patent, such as the low frequency radiation array proposed in publication No. CN 104916910A. In the base station antenna system, the high-frequency antenna and the low-frequency antenna coexist, and are close to each other, mutual coupling is easily generated, and a directional diagram is distorted, and a filter network with an H-shaped structure is loaded on a low-frequency radiating sheet to suppress the influence of a low-frequency oscillator on a high-frequency radiating directional diagram in the conventional publication No. CN 206412463U.
As can be seen, the conventional method has many problems in practical use, and therefore, needs to be improved.
SUMMERY OF THE UTILITY MODEL
To foretell defect, the utility model aims to provide a double polarization base station radiation array with high-gain and high frequency trapped wave, the effect of parasitic radiation antenna has been played at the wire that low frequency antenna array set up all around, and the radiation field that this parasitic antenna produced superposes with the radiation field that low frequency array produced mutually, under the condition that does not influence nested layout scheme, make full use of space resource improves the gain of low frequency antenna.
In order to achieve the above object, the present invention provides a dual-polarized base station radiating array with high gain and high frequency notch, including:
a reflective backplane;
at least one low-frequency radiation oscillator fixedly arranged on the reflection bottom plate;
the four high-frequency radiation arrays are fixedly arranged on the reflection bottom plate and uniformly surround the periphery of the low-frequency radiation arrays;
at least four metal wires are respectively and independently and symmetrically erected on the supporting frames distributed around the low-frequency radiation array.
According to the dual-polarization base station radiation array with the high gain and the high-frequency trapped wave, the low-frequency radiation array comprises a die-casting feed structure, a PCB coupling feed structure and four PCB radiation branches, the lower end of the die-casting feed structure is fixedly installed on the reflection bottom plate, and the PCB coupling feed structure and the PCB radiation branches are installed at the upper end of the die-casting feed structure.
According to the dual-polarized base station radiating array with the high-gain and high-frequency trapped wave, the PCB coupling feed structure comprises a dielectric plate, four rectangular-like copper foils are respectively printed on the upper surface and the lower surface of the dielectric plate, and the copper foils on the upper surface and the lower surface of the dielectric plate are correspondingly conducted one by one through metalized through holes; the four copper foils on the same surface of the dielectric plate are symmetrically distributed, and four interval gaps are formed between every two adjacent copper foils; and an open-circuit gap is etched on each copper foil.
According to the dual-polarized base station radiation array with the high gain and the high-frequency trapped wave, the open-circuit gap is a linear gap or an L-shaped gap or a bent gap, and the total length of the open-circuit gap is one quarter wavelength of the corresponding frequency point.
According to the dual-polarized base station radiation array with the high-gain and high-frequency trapped wave, one ends of the four PCB radiation branches are respectively installed on the four spacing gaps on the upper end face of the dielectric plate, the upper surface and the lower surface of each PCB radiation branch are provided with at least one same radiation piece, and the radiation pieces are of rectangular and/or step-shaped and/or multi-fold line type structures.
According to the dual-polarized base station radiating array with the high gain and the high-frequency trapped wave, the die-casting feed structure comprises an air microstrip line structure and at least two short-circuit metal columns, and the air microstrip line structure is connected with the short-circuit metal columns to form a balun of the antenna.
According to the dual-polarized base station radiation oscillator with high gain and high-frequency trapped wave, the air microstrip line structure comprises a first microstrip ground, a second microstrip ground, a first microstrip feed piece and a second microstrip feed piece, wherein the first microstrip ground and the first microstrip feed piece are connected with two copper foils on the lower end face of the dielectric plate through a first printed metal conductor, and the second microstrip ground and the second microstrip feed piece are connected with the other two copper foils on the lower end face of the dielectric plate through a second printed metal conductor.
According to the dual-polarized base station radiating oscillator with the high gain and the high-frequency notch, the dielectric plate is an FR4 substrate.
According to the dual-polarized base station radiating array with the high-gain and high-frequency trapped wave, the support frame is made of plastic and is vertically installed on the reflecting bottom plate.
According to the dual-polarized base station radiation array with high gain and high-frequency trapped wave, the metal wire is linear or right-angle or arc or irregular; and/or
The total length of the single metal wire is 215 mm-245 mm; and/or
The high-frequency radiation array is a conventional high-frequency die-casting array, and the low-frequency radiation array is nested in the center of the high-frequency radiation array.
The utility model discloses a dual-polarized base station radiation array with high gain and high frequency trapped wave comprises a reflection bottom plate; at least one low-frequency radiation oscillator fixedly arranged on the reflection bottom plate; the four high-frequency radiation arrays are fixedly arranged on the reflection bottom plate and uniformly surround the periphery of the low-frequency radiation arrays; at least four metal wires are respectively and independently and symmetrically erected on the supporting frames distributed around the low-frequency radiation array. Therefore, the utility model discloses the effect of parasitic radiation antenna has been played to the wire that sets up all around at low frequency antenna array, and the radiation field that this parasitic antenna produced and the radiation field that the low frequency array produced superpose mutually, under the condition that does not influence nested layout scheme, make full use of space resource improves the gain of low frequency antenna.
Drawings
Fig. 1 is a schematic structural diagram of a dual-polarized base station radiating array with high-gain and high-frequency notch according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of the low-frequency radiating array of the dual-polarization base station radiating array with high-gain and high-frequency notch according to the preferred embodiment of the present invention;
fig. 3 is a current distribution diagram of the PCB radiating stub of the low frequency radiating array of the dual polarization base station radiating array with high gain and high frequency notch according to the preferred embodiment of the present invention;
fig. 4 is a schematic structural diagram of the PCB coupled feeding structure of the low frequency radiating array of the dual-polarized base station radiating array with high gain and high frequency notch according to the preferred embodiment of the present invention;
fig. 5 is a schematic structural diagram of the die-cast feed structure of the low-frequency radiating array of the dual-polarization base station radiating array with high-gain and high-frequency notch according to the preferred embodiment of the present invention;
fig. 6 is a radiation pattern of the high-frequency radiation array at the 2690MHz frequency point when there is an etched open slot on the PCB coupled feed structure of the low-frequency radiation array of the dual-polarized base station radiation array with high gain and high-frequency notch;
fig. 7 is a curve of the gain of the low-frequency radiating array with or without metal wires around the radiating array of the dual-polarized base station along with the change of frequency.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a dual-polarized base station radiating array with high gain and high frequency notch according to the preferred embodiment of the present invention, which includes a reflective bottom plate 4; the low-frequency radiating array 1 is fixedly arranged on the reflecting bottom plate 4, and the four high-frequency radiating arrays 2 are fixedly arranged on the reflecting bottom plate 4 and uniformly surround the low-frequency radiating array 2; at least four metal wires 3 are respectively and independently and symmetrically erected on supporting frames 5 distributed around the low-frequency radiation array 1; the low-frequency radiating array 1 is a cross array, the working frequency range of the low-frequency radiating array is 698 MHz-960 MHz, the working frequency range of the high-frequency radiating array 2 is 1710 MHz-2690 MHz, and the high-frequency radiating array 2 and the low-frequency radiating array 1 are both antennas polarized at +/-45 degrees; this embodiment is including four high frequency radiation array 2 and four wire 3, and even symmetric distribution sets up four high frequency radiation array 2 around low frequency radiation array 1, low frequency radiation array 1 still is equipped with a plurality of support frame 5 near all around, and four wire 3 symmetries are erect on support frame 5, can utilize the parasitic radiation that four wire 3 of symmetry all around the array produced to improve the gain of array, and the radiation field that this parasitic antenna produced superposes with the radiation field that low frequency array produced mutually, under the condition that does not influence nested layout scheme, make full use of space resource improves the gain of low frequency antenna.
After the low-frequency radiation array 1 radiates, the metal wire 3 can be coupled to corresponding current, electromagnetic waves radiated by the coupling current and electromagnetic waves radiated by the low-frequency radiation array 1 are superposed, and under the condition that a nested layout scheme is not influenced, a directional diagram radiated by the original low-frequency array is improved by fully utilizing space resources. Fig. 7 shows a variation curve of the gain of the low-frequency radiating array 1 with or without the metal wire 3, and it can be seen that after the metal wire 3 is added, the average gain of the antenna is increased by about 0.7dBi, and the gain is obviously increased.
Referring to fig. 2, the low-frequency radiating array 1 includes a die-casting feed structure 8, a PCB coupling feed structure 7 and four PCB radiating branches 6, the lower end of the die-casting feed structure 8 is fixedly mounted on the reflective bottom plate 4, and the PCB coupling feed structure 7 and the PCB radiating branches 6 are mounted at the upper end of the die-casting feed structure 8. The PCB coupling feed structure 7 comprises a dielectric plate 16, four rectangular copper foils are respectively printed on the upper surface and the lower surface of the dielectric plate 16, and the copper foils on the upper surface and the lower surface of the dielectric plate 16 are correspondingly conducted one by one through metalized through holes 15; the four copper foils on the same surface of the dielectric plate 16 are symmetrically distributed, and four spaced gaps are formed between every two adjacent copper foils; each copper foil is etched with an open gap 17. As shown in fig. 4, the dielectric board 16 includes a first copper foil 11, a second copper foil 12, a third copper foil 13 and a fourth copper foil 14, wherein the dielectric board is rectangular, and the four copper foils are symmetrically distributed at opposite angles; exciting the high-frequency radiating oscillator 2 to generate coupling current on the PCB coupling feed structure 7 and the PCB radiating branch 6 of the low-frequency radiating oscillator 1, and the current of the part also participates in radiation and is superimposed with the field radiated by the high-frequency radiating oscillator 2, so that a high-frequency directional diagram is distorted, as shown in fig. 6; in this embodiment, at the distortion point of the high-frequency pattern, the high-frequency coupling current is mainly concentrated on the low-frequency PCB coupling feed structure 7, and the high-frequency current coupled on the low-frequency PCB radiation branch section 6 is weaker, so that an elongated open-circuit slit 17 is etched on each approximately rectangular copper foil of the PCB coupling feed structure 7, and the high-frequency pattern of the corresponding frequency band can be improved by adjusting the length of the open-circuit slit 17. The open-circuit slot 17 of this embodiment is a linear slot, or may be an L-shaped slot or a bent slot in other embodiments, and the total length of the open-circuit slot 17 is a quarter wavelength of a corresponding frequency point, and the corresponding frequency point is a frequency point where a high-frequency directional diagram is distorted due to a stronger current coupled on a PCB feed sheet; as can be seen from fig. 6, when there is no open slot 17 on the PCB coupled feeding structure 7 of the low frequency radiating array 1, the distortion of the radiation pattern of the high frequency is large, and when there is an open slot 17 on the PCB coupled feeding structure 7 of the low frequency radiating array 1, the distortion of the radiation pattern of the high frequency is small and close to the radiation pattern when only high frequency is radiated. If the high-frequency current coupled to the PCB radiation branch 6 of the low-frequency radiation array 1 is concentrated under a certain condition, it can be considered to etch a quarter-wavelength open-circuit gap on the PCB radiation branch 6.
Furthermore, one end of each of the four PCB radiation branches 6 is respectively installed on the four spacing gaps on the upper end surface of the dielectric plate 16, and the same at least one radiation piece is arranged on the upper surface and the lower surface of each of the PCB radiation branches 6, and each radiation piece is in a rectangular and/or step-shaped and/or multi-fold line-shaped structure. The PCB radiation branch 6 can couple electromagnetic waves and radiate, and the impedance characteristic of the antenna can be adjusted by adjusting the gap size and the gap length of the coupling feed structure. Referring to fig. 3, the PCB radiating branches 6 on the upper and lower surfaces have the same shape, and the radiating fins thereon may have a rectangular shape and/or a trapezoidal shape and/or a bent line. The utility model discloses a mode that rectangle line and kinks combined together is as the radiation piece of low frequency radiation array 1, can increase the effective flow path of electric current through the kinks, reduces the physical dimension of radiation piece. When the 45 + port of the low-frequency radiation array 1 is excited, the current 10 formed on the four PCB radiation branches 6 can synthesize 45 + radiation field, and similarly, when the 45-port of the low-frequency radiation array 1 is excited, the 45-radiation field can be synthesized on the four PCB radiation branches 6. The distance between the reflection bottom plate 4 and the PCB radiation branch 6 of the low-frequency radiation array 1 is about a quarter wavelength of a central frequency point.
Referring to fig. 5, the die-cast feed structure 8 includes an air microstrip line structure and at least two short-circuit metal posts 22, and the air microstrip line structure is connected with the short-circuit metal posts 22 to form a balun of the antenna. The length dimension of the two metal posts 22 is approximately one quarter wavelength of the antenna center frequency. Further, the air microstrip line structure includes a first microstrip ground 18, a second microstrip ground 20, a first microstrip feed patch 19 and a second microstrip feed patch 21, the first microstrip ground 18 and the first microstrip feed patch 19 are connected with two copper foils on the lower end face of the dielectric plate 16 through a first printed metal conductor, and the second microstrip ground 20 and the second microstrip feed patch 21 are connected with the other two copper foils on the lower end face of the dielectric plate 16 through a second printed metal conductor. Specifically, a first microstrip ground 18 and a first microstrip feed patch 19 transmit an excitation signal to a first copper foil 11 and a third copper foil 13 which are approximately rectangular through a section of printed metal conductor; the PCB radiating stub 6 is coupled to the excitation signals on the first copper foil 11 and the third copper foil 13, which are approximately rectangular, and can form a current 10, generating a radiation field of +/-45 °. And the second microstrip ground 20 and the second microstrip feed patch 21 transmit the excitation signal to the second copper foil 12 and the fourth copper foil 14, which are approximately rectangular, through a section of printed metal conductor, so that a-45 ° radiation field can be generated.
Preferably, the dielectric sheet 16 is an FR4 (a fire resistant material grade code) substrate. The support frame 5 is made of plastic and is vertically arranged on the reflection bottom plate 4.
The metal wire 3 of the embodiment is right-angled, and may be linear, circular or irregular in other embodiments; specifically, the total length of a single metal wire is 215 mm-245 mm, that is, the total length of the metal wire 3 is about half the wavelength of the lowest frequency point of the working frequency band. The shape and the placement position of the metal wire 3 are selected to improve the indexes of gain, wave width, front-to-back ratio and the like of the low-frequency array, and the cross polarization ratio is slightly poor. High frequency radiation array 2 is conventional high frequency die-casting array, and low frequency radiation array 1 nests in the positive center of high frequency radiation array 2, sets up a low frequency radiation oscillator 1 in the positive center department of four high frequency radiation oscillators 2 promptly, can reduce array antenna's space size. The parasitic radiation generated by adding four metal wires symmetrically around the array is utilized to improve the gain of the array. The influence of the low-frequency array on a high-frequency radiation directional diagram is inhibited by etching an open-circuit gap on a coupling feed sheet of the low-frequency array.
To sum up, the utility model discloses the effect of parasitic radiation antenna has been played to the wire that sets up all around at low frequency antenna array, and the radiation field that this parasitic antenna produced superposes mutually with the radiation field that low frequency array produced, under the condition that does not influence nested layout scheme, make full use of space resource improves the gain of low frequency antenna. An open-circuit gap etched on an approximately rectangular copper foil of PCB coupling feed can generate trap characteristics at corresponding frequency points of high frequency, so as to inhibit high-frequency electromagnetic waves, reduce coupling between high frequency and low frequency and improve a high-frequency directional diagram; and the feed and balun structure formed by the die-cast air microstrip and the short-circuit metal column is firmer, and is convenient for batch processing and production.
Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.
Claims (10)
1. A dual-polarized base station radiating array with high gain and high frequency notch is characterized by comprising:
a reflective backplane;
at least one low-frequency radiation oscillator fixedly arranged on the reflection bottom plate;
the four high-frequency radiation arrays are fixedly arranged on the reflection bottom plate and uniformly surround the periphery of the low-frequency radiation arrays;
at least four metal wires are respectively and independently and symmetrically erected on the supporting frames distributed around the low-frequency radiation array.
2. The dual-polarization base station radiating array with high gain and high frequency notch according to claim 1, wherein the low frequency radiating array comprises a die-cast feed structure, a PCB coupled feed structure and four PCB radiating branches, the lower end of the die-cast feed structure is fixedly installed on the reflection bottom plate, and the PCB coupled feed structure and the PCB radiating branches are installed on the upper end of the die-cast feed structure.
3. The dual-polarized base station radiating oscillator with high gain and high frequency notch according to claim 2, wherein the PCB coupling feed structure comprises a dielectric plate, four rectangular-like copper foils are printed on the upper and lower surfaces of the dielectric plate, respectively, and the copper foils on the upper and lower surfaces of the dielectric plate are conducted through metalized via holes in a one-to-one correspondence manner; the four copper foils on the same surface of the dielectric plate are symmetrically distributed, and four interval gaps are formed between every two adjacent copper foils; and an open-circuit gap is etched on each copper foil.
4. The dual-polarized base station radiating array with high gain and high frequency notch according to claim 3, wherein the open-circuit slot is a linear slot, an L-shaped slot or a bent slot, and the total length of the open-circuit slot is a quarter wavelength of a corresponding frequency point.
5. The dual-polarized base station radiating array with the high-gain and high-frequency notch according to claim 3, wherein one end of each of the four PCB radiating branches is respectively installed on the four spacing gaps on the upper end surface of the dielectric slab, the upper and lower surfaces of each PCB radiating branch are provided with at least one identical radiating sheet, and each radiating sheet is in a rectangular and/or step-shaped and/or multi-fold line-shaped structure.
6. The dual polarized base station radiating array with high gain and high frequency notch of claim 3, wherein the die cast feed structure comprises an air microstrip line structure and at least two short circuit metal posts, the air microstrip line structure and the short circuit metal posts are connected to form a balun of the antenna.
7. The dual-polarized base station radiating oscillator with high gain and high frequency notch of claim 6, wherein the air microstrip line structure comprises a first microstrip ground, a second microstrip ground, a first microstrip feed patch and a second microstrip feed patch, the first microstrip ground and the first microstrip feed patch are connected with two copper foils on the lower end face of the dielectric plate through a first printed metal conductor, and the second microstrip ground and the second microstrip feed patch are connected with the other two copper foils on the lower end face of the dielectric plate through a second printed metal conductor.
8. The dual polarized base station radiating array with high gain and high frequency notch of claim 3, wherein said dielectric board is FR4 substrate.
9. The dual polarized base station radiating array with high gain and high frequency notch as claimed in claim 1, wherein said support frame is made of plastic and is vertically installed on said reflective bottom plate.
10. The dual-polarization base station radiating array with high gain and high frequency notch of any one of claims 1 to 9, wherein the metal wires are linear or right-angled or circular arc; and/or
The total length of the single metal wire is 215 mm-245 mm; and/or
The high-frequency radiation array is a conventional high-frequency die-casting array, and the low-frequency radiation array is nested in the center of the high-frequency radiation array.
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| CN201922156440.7U CN211320314U (en) | 2019-12-03 | 2019-12-03 | Dual-polarized base station radiating array with high gain and high frequency trapped wave |
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| CN201922156440.7U CN211320314U (en) | 2019-12-03 | 2019-12-03 | Dual-polarized base station radiating array with high gain and high frequency trapped wave |
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