CN112216973A - Low-frequency radiation unit and base station antenna - Google Patents
Low-frequency radiation unit and base station antenna Download PDFInfo
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- CN112216973A CN112216973A CN202011207458.6A CN202011207458A CN112216973A CN 112216973 A CN112216973 A CN 112216973A CN 202011207458 A CN202011207458 A CN 202011207458A CN 112216973 A CN112216973 A CN 112216973A
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- 230000005855 radiation Effects 0.000 title claims abstract description 69
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- 238000001914 filtration Methods 0.000 abstract description 18
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/106—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using two or more intersecting plane surfaces, e.g. corner reflector antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
Abstract
The invention provides a low-frequency radiating unit, which comprises a first circuit board, a second circuit board and a bottom board, wherein the first circuit board is connected with the second circuit board; the first circuit board comprises a first transverse plate and a first vertical plate; the second circuit board comprises a second transverse plate and a second vertical plate; the first vertical plate and the second vertical plate are mutually crossed and embedded to form an X-shaped structure, and the lower ends of the first vertical plate and the second vertical plate are fixed on the bottom plate; the first transverse plate and the second transverse plate are respectively provided with two radiating arms which are bilaterally symmetrical to form a dual-polarized radiating unit, each radiating arm comprises a plurality of horizontally arranged broadband line sections, and every two adjacent broadband line sections are connected by a bent thin strip line section; the first vertical plate and the second vertical plate are both provided with a feed balun, the lower end of the feed balun is electrically connected with the bottom plate, and the upper end of the feed balun is electrically connected with the radiation arm. Therefore, the low-frequency radiation unit has a filtering function, and can effectively reduce the influence of the low-frequency radiation unit on the high-frequency radiation performance when the high-frequency and low-frequency antennas are nested in the array, so that the multi-frequency and miniaturization of the antenna can be realized.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a low-frequency radiating unit and a base station antenna.
Background
The mobile wireless communication technology is rapidly developed, 2G (gsm), 3G (WCDMA, TD-SCDMA, CDMA2000), and 4G (TDD-LTE, FDD-LTE) have been widely integrated into people's daily lives, 5G mobile communication network deployment has also been proposed, and mobile wireless communication is in a situation of rapid development and coexistence of multiple technologies.
The base station antenna is a most front passive device in a mobile wireless communication system, receives radio information sent by a user mobile terminal, and simultaneously sends the radio information to the user mobile terminal, and is an important information hub in the mobile wireless communication system. Meanwhile, due to the shortage of the environment in the sky, the multi-frequency, miniaturization and portability of the base station antenna become urgent market demands.
In order to realize the multi-frequency and miniaturization of the base station antenna, the high-frequency radiation unit and the low-frequency radiation unit in the antenna are arranged more compactly, the high-frequency radiation unit enters the lower space of the low-frequency radiation unit, electromagnetic wave signals radiated by the high-frequency radiation unit can be received and re-scattered by the low-frequency radiation unit, so that the directional diagram of the high-frequency radiation unit is seriously distorted, the signal coverage quality of the base station antenna is reduced, and even the network of a user mobile terminal is interrupted.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a low-frequency radiating unit and a base station antenna, where the low-frequency radiating unit has a filtering function, and when the high-frequency and low-frequency antennas are nested into a sleeve array, the influence of the low-frequency radiating unit on the high-frequency radiation performance can be effectively reduced, so that the multi-frequency and miniaturization of the antenna can be realized.
In order to achieve the above object, the present invention provides a low frequency radiating element, which includes a first circuit board, a second circuit board and a bottom board;
the first circuit board comprises a first transverse plate, and a first vertical plate vertically extends downwards from the middle of the first transverse plate;
the second circuit board comprises a second transverse plate, and a second vertical plate vertically extends downwards from the middle of the second transverse plate;
the first riser of the first circuit board and the second riser of the second circuit board are mutually crossed and embedded to form an X-shaped structure, and the lower ends of the first riser and the second riser are fixed on the bottom plate;
the first transverse plate and the second transverse plate are respectively provided with two radiating arms which are bilaterally symmetrical to form a dual-polarized radiating unit, each radiating arm comprises a plurality of horizontally arranged broadband line sections, and every two adjacent broadband line sections are connected by a bent thin strip line section;
the first vertical plate and the second vertical plate are both provided with a feed balun, the lower end of the feed balun is electrically connected with the bottom plate, and the upper end of the feed balun is electrically connected with the radiation arm.
According to the low-frequency radiation unit, the two resonance structures which are bilaterally symmetrical are arranged in the middle of the upper ends of the first transverse plate and the second transverse plate.
According to the low-frequency radiating unit, each resonant structure comprises a transverse strip, and a vertical strip extends downwards and is arranged adjacent to the inner side of the transverse strip;
the transverse strip is located above a first broadband line segment in the middle of the first transverse plate or the second transverse plate, and the vertical strip is located on the inner side of the first broadband line segment.
According to the low-frequency radiation unit, the feed balun comprises a microstrip line, a plurality of impedance matching branches, a slot line, two zigzag lines and two coupling structures;
the microstrip line and the plurality of impedance matching branches are positioned on the back surfaces of the first vertical plate and the second vertical plate and are connected with each other;
the slot line, the two zigzag lines and the two coupling structures are positioned on the front surfaces of the first circuit board and the second circuit board and are connected with each other;
and the signal is coupled to the slot line through the microstrip line and the impedance matching branch, and is fed to the radiation arm through the two meander lines and the two coupling structures.
According to the low-frequency radiation unit, the length of the thin strip line segment is 0.1-0.25 of the wavelength of the high-frequency working frequency; and/or
The lengths and shapes of the thin strip line segments are the same or different.
According to the low-frequency radiation unit, the length of the broadband line segment is less than 0.25 of the wavelength of the high-frequency working frequency; and/or
The broadband line segment is rectangular or square.
According to the low-frequency radiation unit, the four boundary lines of the first transverse plate and the second transverse plate are mutually connected and fixed.
According to the low-frequency radiating unit, a first embedding groove is formed in the middle of the lower end of the first vertical plate, and a second embedding groove is formed in the middle of the upper end of the second vertical plate; the first vertical plate and the second vertical plate are mutually crossed and embedded into an X-shaped structure through the first embedding groove and the second embedding groove respectively.
According to the low-frequency radiating unit, the bottom plate is provided with a plurality of openings, and the lower ends of the first vertical plate and the second vertical plate are inserted into the openings; and the grounding end of the feed balun is electrically connected with the bottom surface of the bottom plate.
The invention also provides a base station antenna which comprises a reflecting plate, wherein a plurality of high-frequency radiating units and a plurality of low-frequency radiating units are distributed on the reflecting plate, and the low-frequency radiating units are nested and inserted in the middle of the high-frequency radiating units.
The low-frequency radiating unit comprises a first circuit board, a second circuit board and a bottom board, wherein the first circuit board comprises a first transverse board and a first vertical board; the second circuit board comprises a second transverse plate and a second vertical plate, and the first vertical plate and the second vertical plate are both provided with feed baluns and are mutually crossed and embedded to form an X-shaped structure; the first transverse plate and the second transverse plate are respectively provided with two radiating arms which are bilaterally symmetrical to form a dual-polarized radiating unit, each radiating arm comprises a plurality of horizontally arranged broadband line sections, and every two adjacent broadband line sections are connected by a bent thin strip line section; the radiation arm is far less than the required electric length of high-frequency resonance after being segmented into a plurality of broadband line segments, consequently can't carry out high-frequency resonance, and the thin broadband line segment of coupling has very strong inhibitory action to high-frequency electromagnetic wave simultaneously, realizes the filtering function to high-frequency electromagnetic wave jointly, when high low frequency antenna nested array, can effectively reduce the influence of low frequency radiation unit to high frequency radiation performance to can realize multifrequency, the miniaturization of antenna.
Drawings
Fig. 1 is a schematic perspective view of a preferred low frequency radiating element of the present invention;
fig. 2 is a schematic rear view of a first circuit board of a preferred low frequency radiating element of the present invention;
fig. 3 is a schematic front view of a first circuit board of a preferred low frequency radiating element of the present invention;
fig. 4 is an enlarged schematic view of the feeding portion of a preferred low frequency radiating element of the present invention;
fig. 5 is an enlarged schematic view of the filtering structure on the radiating arm of the preferred low frequency radiating element of the present invention;
fig. 6 is a schematic rear view of a second circuit board of a preferred low frequency radiating element of the present invention;
fig. 7 is a schematic front view of a second circuit board of a preferred low frequency radiating element of the present invention;
fig. 8 is a schematic perspective view of a bottom plate of a preferred low frequency radiating element of the present invention;
FIG. 9 is a schematic diagram of a preferred low frequency radiating element of the present invention having two filtering structures;
FIG. 10 is a schematic diagram of a preferred low frequency radiating element of the present invention having a filtering structure;
fig. 11 is a schematic perspective view of a high-low frequency nested array of a preferred base station antenna of the present invention;
FIG. 12 is a graph comparing nested high frequency versus pure high frequency at 1.9GHz patterns for a base station antenna of the present invention;
FIG. 13 is a comparison of nested high frequency versus pure high frequency above 2.3GHz patterns for a base station antenna of the present invention;
fig. 14 is a comparison of nested high frequency versus pure high frequency above 2.6GHz patterns for a base station antenna of the present invention.
Reference numerals
A low-frequency radiating element 100; a first wiring board 10; a first transverse plate 11;
a first riser 12; a first fitting groove 121; a second wiring board 20;
a second transverse plate 21; a second riser 22; a second fitting groove 221;
a base plate 30; an opening 31; a radiation arm 40;
a broadband line segment 41; a first broadband line segment 411; thin strip line segments 42;
a feed balun 50; a resonant structure 60; a microstrip line 51;
an impedance matching stub 52; a slot line 53; a meander line 54;
a coupling structure 55; a transverse strip 61; a vertical strip 62;
a boundary line 70; a base station antenna 200; a reflection plate 300;
the high-frequency radiation unit 400.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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.
It should be noted that references in the specification to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not intended to refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
Moreover, where certain terms are used throughout the description and following claims to refer to particular components or features, those skilled in the art will understand that manufacturers may refer to a component or feature by different names or terms. This specification and the claims that follow do not intend to distinguish between components or features that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. In addition, the term "coupled" is intended to include any direct or indirect electrical connection. Indirect electrical connection means include connection by other means.
In order to solve the problem of high-low frequency mutual coupling in the existing high-low frequency nested array, the filter principle is fused into the radiation unit, so that the low-frequency radiation unit has the filtering characteristic on the high-frequency radiation unit, namely, the low-frequency radiation unit is inhibited from receiving electromagnetic waves radiated by the high-frequency radiation unit, the scattering of high-frequency signals by the low-frequency radiation unit is weakened, the mutual coupling effect of the low-frequency radiation unit on the high-frequency radiation unit is weakened, and the wave transmission of the high-frequency radiation unit is realized.
Fig. 1 to 10 show a preferred structure of the low frequency radiating unit of the present invention, the low frequency radiating unit 100 includes a first circuit board 10, a second circuit board 20 and a bottom board 30, and the first circuit board 10, the second circuit board 20 and the bottom board 30 are preferably PCB boards. As shown in fig. 1, the first circuit board 10 and the second circuit board 20 are two antennas with different polarization directions, the first circuit board 10 and the second circuit board 20 are slotted complementarily and are cross-embedded with each other to form an X-shaped structure, and the lower end of the second circuit board 20 of the first circuit board 10 is fixed on the bottom plate 30. The first circuit board 10 and the second circuit board 20 are combined into a dual-polarized radiation unit.
The first circuit board 10 includes a first horizontal plate 11, and a first vertical plate 12 is vertically extended downwards in the middle of the first horizontal plate 11. The first horizontal plate 11 and the first vertical plate 12 are preferably integrally formed, but the first circuit board 10 may be formed by the first horizontal plate 11 and the first vertical plate 12 separately.
The second circuit board 20 includes a second horizontal plate 21, and a second vertical plate 22 is vertically extended downwards in the middle of the second horizontal plate 21. The second horizontal plate 21 and the second vertical plate 22 are preferably integrally formed, but the first circuit board 10 may be formed by the second horizontal plate 21 and the second vertical plate 22 independently.
As shown in fig. 1, the first riser 12 of the first circuit board 10 and the second riser 22 of the second circuit board 20 are fitted to each other in an X-shaped configuration. Preferably, a first fitting groove 121 is provided at a lower middle portion of the first riser 12, and a second fitting groove 221 is provided at an upper middle portion of the second riser 22. The first riser 12 and the second riser 22 are fitted into an X-shaped structure by intersecting each other via the first fitting groove 121 and the second fitting groove 221, respectively, that is, the first riser 12 can be vertically inserted from the top of the second riser 22 to the middle of the second riser 22. The lower ends of the first riser 12 and the second riser 22 are fixed to the bottom plate 30.
As shown in fig. 1, after the first circuit board 10 and the second circuit board 20 are combined, four boundary lines 70 indicated by a circle at the upper center of the first horizontal plate 11 and the second horizontal plate 21 are preferably connected and fixed to each other by welding or the like. Therefore, the metal copper foils on the two polarization direction radiation arms 40 are integrated into a whole, which is favorable for structural stability, and the structure can widen the working bandwidth of the low-frequency radiation unit 100.
As shown in fig. 1 to 7, two radiation arms 40 are arranged on each of the first horizontal plate 11 and the second horizontal plate 21, and are bilaterally symmetrical to form a dual-polarized radiation unit, each radiation arm 40 includes a plurality of horizontally arranged wide band segments 41, and two adjacent wide band segments 41 are connected by a thin bent band segment 42. In this embodiment, the radiation arm 40 includes four horizontally arranged broadband line segments 41 and three thin strip line segments 42, and two adjacent broadband line segments 41 are connected by one thin strip line segment 42. It should be noted that the number of the wide band line segments 41 and the thin band line segments 42 is not limited, and can be set according to actual needs.
Preferably, the length of the broadband line segment 41 is less than 0.25 wavelength of the high frequency operating frequency. The broadband line segment 41 is rectangular or square. As shown in fig. 5, the low frequency radiating unit 100 of the present invention segments the X-shaped radiating arm into a plurality of wideband line segments 41 according to the frequency band to be filtered, so that the length of each wideband line segment 41 is less than 0.25 of the wavelength of the high frequency electromagnetic wave to be filtered, the segmented wide lines are connected by the bent thin line segments 42, the coupled thin line segments 42 have a strong suppression effect on the high frequency electromagnetic wave, and the high frequency current cannot pass through, and the wideband line segments 41 cannot resonate at high frequency because the segmented length is much less than the electrical length required by the high frequency resonance, and the inductive current is very weak, so that the filtering characteristics can be realized.
Preferably, the length of the coupled thin strip line 42 is generally controlled to be 0.1-0.25 wavelength of the high frequency operating frequency. The invention also allows the length and gap of the elongated thin strip line segment 42 to be adjusted to optimize filtering performance. The lengths and shapes of the thin strip line segments 42 are the same or different to realize a wide-band filter characteristic.
The first vertical plate 12 and the second vertical plate 22 are both provided with a feeding balun 50, the lower end of the feeding balun 50 is electrically connected with the bottom plate 30, that is, the lower end of the feeding balun 50 is in feeding connection with the feeding network, and the upper end of the feeding balun 50 is electrically connected with the radiating arm 40, that is, the upper end of the feeding balun 50 is in feeding connection with the radiating arm 40.
The invention changes an X-type base station antenna into a broadband radiation unit with broadband filtering characteristics. The radiation arm 40 of the low-frequency radiation unit 100 is segmented and added with a bending line filtering structure to realize a filtering function, the length and the position of a plurality of bending lines are adjusted to realize broadband filtering characteristics, and the influence of the low-frequency radiation unit 100 on high-frequency radiation performance can be effectively reduced when the high-frequency and low-frequency antenna is embedded and arrayed, so that the multi-frequency, miniaturization and portability of the antenna can be realized.
Preferably, two resonance structures 60 are arranged in the middle of the upper ends of the first transverse plate 11 and the second transverse plate 21, and are bilaterally symmetrical. As shown in fig. 4, each resonant structure 60 includes a transverse strip 61, and the transverse strip 61 extends downwardly adjacent the inner side to form a vertical strip 62. The transverse strip 61 is located above the first wide strip segment 411 at the middle of the first transverse plate 11 or the second transverse plate 21, and the vertical strip 62 is located inside the first wide strip segment 411. The working bandwidth of the antenna with the X-shaped structure is generally narrow, in order to widen the working frequency bandwidth of the antenna, a resonance structure 60 is added in the middle of an X-shaped radiation arm to increase the bandwidth, meanwhile, a coupling feed structure is adopted for feeding, and a bending line is added on a balun to converge the standing wave.
Preferably, as shown in fig. 2 to 7, the feeding balun 50 adopts an integrated balun feed, and includes a microstrip line 51, a plurality of impedance matching branches 52, a slot line 53, two meander lines 54, and two coupling structures 55. The microstrip line 51 is preferably a 50 ohm microstrip line. The microstrip line 51 and the plurality of impedance matching stubs 52 are located on the back surfaces of the first riser 12 and the second riser 22 and connected to each other. The slot line 53, the two meander lines 54 and the two coupling structures 55 are located on the front side of the first circuit board 10 and the second circuit board 20 and are connected to each other. The signal is fed through a microstrip line 51, coupled to a slot line 53 on the back side through a coupling slot after passing through a plurality of impedance matching stubs 52, and fed to the radiating arm 40 through two meander lines 54 and two coupling structures 55. Fig. 4 is an enlarged schematic diagram of the feeding portion of a preferred low frequency radiating element of the present invention, with two coupling structures 55 feeding the first broadband line segment 411 through the slot, and two resonant structures 60 matching the impedance through coupling, which adds coupling between the 2 polarized radiating arms for tuning the oscillator standing wave.
As shown in fig. 1 and 8, the bottom plate 30 is provided with a plurality of openings 31 to facilitate the insertion and fixation of the lower ends of the first riser 12 and the second riser 22 into the openings 31. The bottom surface of the bottom plate 30 may be used as a conductive medium by way of copper plating, etc., and the ground terminal (GND) of the feeding balun 50 is electrically connected to the bottom surface of the bottom plate 30 by way of welding, etc., and also plays a role in fixing the radiation unit.
Fig. 9 is a schematic diagram of two filtering structures in a preferred low-frequency radiating unit of the present invention, two radiating arms 40 that are bilaterally symmetric are disposed on both the first horizontal plate 11 and the second horizontal plate 21 of the low-frequency radiating unit 100 to form a dual-polarized radiating unit, in this embodiment, each radiating arm 40 includes three horizontally arranged broadband line segments 41 and two bent thin strip line segments 42, and two adjacent broadband line segments 41 are connected by one thin strip line segment 42 respectively to form two filtering structures together.
Fig. 10 is a schematic diagram of a filtering structure in a preferred low-frequency radiating element of the present invention, where two radiating arms 40 that are bilaterally symmetric are disposed on both the first horizontal plate 11 and the second horizontal plate 21 of the low-frequency radiating element 100 to form a dual-polarized radiating element, in this embodiment, the radiating arms 40 include two horizontally arranged broadband line segments 41 and a bent thin strip line segment 42, and the two broadband line segments 41 are connected by the thin strip line segment 42 to form a filtering structure together.
Fig. 11 is a schematic perspective view of a high-low frequency nested array of a preferred base station antenna of the present invention, and the base station antenna 200 employs the low frequency radiating element 100 shown in fig. 1 to 10. Specifically, the base station antenna 200 includes a reflection plate 300, a plurality of high frequency radiation units 400 and a plurality of low frequency radiation units 100 are distributed on the reflection plate 300, and the low frequency radiation units 100 are inserted into the middle of the high frequency radiation units 400.
Fig. 11 is a small array structure using the radiation unit, the small array including one low frequency radiation unit 100, eight high frequency radiation units 400, and a reflection plate 300, the low frequency radiation unit 100 and the high frequency radiation units 400 being disposed on the reflection plate 300, and the low frequency radiation unit 100 being disposed in the middle of the eight high frequency radiation units 400. The nested combination of the low-frequency radiating element 100 and the high-frequency radiating element 400 of the invention has no influence on the directional diagram of the high-frequency unit. It should be noted that the arrangement and number of the low-frequency radiating units 100 and the high-frequency radiating units 400 of the base station antenna 200 of the present invention are not limited, and may be arbitrarily set according to actual needs.
Fig. 12 is a graph comparing a nested high frequency with a pure high frequency of 1.9GHz pattern of the base station antenna of the present invention, fig. 13 is a graph comparing a nested high frequency with a pure high frequency of 2.3GHz pattern of the base station antenna of the present invention, and fig. 14 is a graph comparing a nested high frequency with a pure high frequency of 2.6GHz pattern of the base station antenna of the present invention. Wherein, the 1# state curve is a pure high-frequency directional diagram without low frequency of the small array in fig. 11, and the 3# state curve is a high-frequency directional diagram of the high-low frequency nested array in fig. 11, it can be seen that the high-frequency directional diagram under nesting is basically consistent with the pure high-frequency directional diagram under the working frequencies of 1.9GHz, 2.3GHz and 2.6 GHz.
In summary, the low-frequency radiating unit of the invention includes a first circuit board, a second circuit board and a bottom board, wherein the first circuit board includes a first transverse board and a first vertical board; the second circuit board comprises a second transverse plate and a second vertical plate, and the first vertical plate and the second vertical plate are both provided with feed baluns and are mutually crossed and embedded to form an X-shaped structure; the first transverse plate and the second transverse plate are respectively provided with two radiating arms which are bilaterally symmetrical to form a dual-polarized radiating unit, each radiating arm comprises a plurality of horizontally arranged broadband line sections, and every two adjacent broadband line sections are connected by a bent thin strip line section; the radiation arm is far less than the required electric length of high-frequency resonance after being segmented into a plurality of broadband line segments, consequently can't carry out high-frequency resonance, and the thin broadband line segment of coupling has very strong inhibitory action to high-frequency electromagnetic wave simultaneously, realizes the filtering function to high-frequency electromagnetic wave jointly, when high low frequency antenna nested array, can effectively reduce the influence of low frequency radiation unit to high frequency radiation performance to can realize multifrequency, the miniaturization of antenna.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A low-frequency radiating unit is characterized by comprising a first circuit board, a second circuit board and a bottom board;
the first circuit board comprises a first transverse plate, and a first vertical plate vertically extends downwards from the middle of the first transverse plate;
the second circuit board comprises a second transverse plate, and a second vertical plate vertically extends downwards from the middle of the second transverse plate;
the first riser of the first circuit board and the second riser of the second circuit board are mutually crossed and embedded to form an X-shaped structure, and the lower ends of the first riser and the second riser are fixed on the bottom plate;
the first transverse plate and the second transverse plate are respectively provided with two radiating arms which are bilaterally symmetrical to form a dual-polarized radiating unit, each radiating arm comprises a plurality of horizontally arranged broadband line sections, and every two adjacent broadband line sections are connected by a bent thin strip line section;
the first vertical plate and the second vertical plate are both provided with a feed balun, the lower end of the feed balun is electrically connected with the bottom plate, and the upper end of the feed balun is electrically connected with the radiation arm.
2. The low-frequency radiating element according to claim 1, wherein two left-right symmetric resonant structures are arranged in the middle of the upper ends of the first transverse plate and the second transverse plate.
3. The low frequency radiating element of claim 2, wherein each of the resonant structures comprises a transverse strip having a vertical strip extending downwardly adjacent to the inner side;
the transverse strip is located above a first broadband line segment in the middle of the first transverse plate or the second transverse plate, and the vertical strip is located on the inner side of the first broadband line segment.
4. The low-frequency radiating element according to claim 1, wherein the feed balun includes a microstrip line, a plurality of impedance matching stubs, a slot line, two meander lines and two coupling structures;
the microstrip line and the plurality of impedance matching branches are positioned on the back surfaces of the first vertical plate and the second vertical plate and are connected with each other;
the slot line, the two zigzag lines and the two coupling structures are positioned on the front surfaces of the first circuit board and the second circuit board and are connected with each other;
and the signal is coupled to the slot line through the microstrip line and the impedance matching branch, and is fed to the radiation arm through the two meander lines and the two coupling structures.
5. The low-frequency radiating element according to claim 1, wherein the length of the thin strip line segment is 0.1-0.25 of the wavelength of the high-frequency operating frequency; and/or
The lengths and shapes of the thin strip line segments are the same or different.
6. The low frequency radiating element of claim 1, wherein the length of the broadband line segment is less than 0.25 high frequency operating frequency wavelength; and/or
The broadband line segment is rectangular or square.
7. The low frequency radiating element according to claim 1, wherein the first and second cross plates are fixedly connected to each other at four boundary lines.
8. The low-frequency radiating element according to claim 1, wherein a first fitting groove is formed in the middle of the lower end of the first riser, and a second fitting groove is formed in the middle of the upper end of the second riser; the first vertical plate and the second vertical plate are mutually crossed and embedded into an X-shaped structure through the first embedding groove and the second embedding groove respectively.
9. The low frequency radiating element according to claim 1, wherein the bottom plate is provided with a plurality of openings into which lower ends of the first riser and the second riser are inserted; and the grounding end of the feed balun is electrically connected with the bottom surface of the bottom plate.
10. A base station antenna, characterized in that, it comprises a reflection plate, a plurality of high frequency radiation units and a plurality of low frequency radiation units according to any claim 1-9 are distributed on the reflection plate, the low frequency radiation units are nested and inserted in the middle of the high frequency radiation units.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207458.6A CN112216973A (en) | 2020-11-03 | 2020-11-03 | Low-frequency radiation unit and base station antenna |
| PCT/CN2021/075799 WO2022095305A1 (en) | 2020-11-03 | 2021-02-07 | Low frequency radiation unit and base station antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207458.6A CN112216973A (en) | 2020-11-03 | 2020-11-03 | Low-frequency radiation unit and base station antenna |
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| Publication Number | Publication Date |
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| CN112216973A true CN112216973A (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011207458.6A Pending CN112216973A (en) | 2020-11-03 | 2020-11-03 | Low-frequency radiation unit and base station antenna |
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| Country | Link |
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| CN (1) | CN112216973A (en) |
| WO (1) | WO2022095305A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599974A (en) * | 2021-03-02 | 2021-04-02 | 摩比科技（深圳）有限公司 | Low-frequency radiation unit and separable multi-frequency base station antenna |
| CN113224527A (en) * | 2021-05-14 | 2021-08-06 | 摩比科技（深圳）有限公司 | Low-frequency radiation unit for inhibiting pilot frequency scattering and base station antenna |
| CN113629396A (en) * | 2021-08-10 | 2021-11-09 | 苏州纬度天线有限公司 | Low-profile radiation unit capable of improving gain and front-to-back ratio |
| WO2022095305A1 (en) * | 2020-11-03 | 2022-05-12 | 摩比天线技术（深圳）有限公司 | Low frequency radiation unit and base station antenna |
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| CN115020972B (en) * | 2022-06-22 | 2023-07-18 | 北京航空航天大学 | Ultra-wideband impedance loading dual-polarized electric small-size Vivaldi antenna |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203932313U (en) * | 2014-05-07 | 2014-11-05 | 武汉虹信通信技术有限责任公司 | A kind of high intermodulation dual polarization wall aerial |
| KR101599526B1 (en) * | 2014-07-14 | 2016-03-07 | 주식회사 에이티앤에스 | Multi Polarization Dipole Antenna |
| CN107275804B (en) * | 2016-04-08 | 2022-03-04 | 康普技术有限责任公司 | Multi-band antenna array with Common Mode Resonance (CMR) and Differential Mode Resonance (DMR) removal |
| CN210443665U (en) * | 2019-10-21 | 2020-05-01 | 南京澳博阳射频技术有限公司 | Radiating unit with 880-960MHz band filtering characteristic and base station antenna |
| CN111786088A (en) * | 2020-06-20 | 2020-10-16 | 广东晖速通信技术股份有限公司 | Antenna array structure based on frequency selective surface |
| CN112216973A (en) * | 2020-11-03 | 2021-01-12 | 摩比天线技术（深圳）有限公司 | Low-frequency radiation unit and base station antenna |
-
2020
- 2020-11-03 CN CN202011207458.6A patent/CN112216973A/en active Pending
-
2021
- 2021-02-07 WO PCT/CN2021/075799 patent/WO2022095305A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095305A1 (en) * | 2020-11-03 | 2022-05-12 | 摩比天线技术（深圳）有限公司 | Low frequency radiation unit and base station antenna |
| CN112599974A (en) * | 2021-03-02 | 2021-04-02 | 摩比科技（深圳）有限公司 | Low-frequency radiation unit and separable multi-frequency base station antenna |
| CN113224527A (en) * | 2021-05-14 | 2021-08-06 | 摩比科技（深圳）有限公司 | Low-frequency radiation unit for inhibiting pilot frequency scattering and base station antenna |
| CN113224527B (en) * | 2021-05-14 | 2023-06-30 | 摩比科技（深圳）有限公司 | Low-frequency radiation unit for inhibiting different-frequency scattering and base station antenna |
| CN113629396A (en) * | 2021-08-10 | 2021-11-09 | 苏州纬度天线有限公司 | Low-profile radiation unit capable of improving gain and front-to-back ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022095305A1 (en) | 2022-05-12 |
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