CN115133287A

CN115133287A - Antenna array side reflecting element with isolating circuit and array antenna

Info

Publication number: CN115133287A
Application number: CN202210575637.8A
Authority: CN
Inventors: 熊英健; 岳彩龙; 高永杰; 梁兆标; 刘木林; 钟良相
Original assignee: Tongyu Communication Inc
Current assignee: Tongyu Communication Inc
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-09-30

Abstract

The side reflecting element comprises a first filtering unit for filtering electric fields of the same frequency band and different antenna radiation units with the same polarization and/or different polarizations, a second filtering unit for filtering the radiation units with different frequency bands, a radiator circuit for receiving filtered induced currents and generating directional radiation electric waves towards the antenna radiation direction, and a grounding circuit connected with an antenna ground plate. The array antenna is applied to a multi-frequency dual-polarized antenna, can filter out electric wave interference, enables each antenna in the array to work well in a working frequency band, enables waves of each row of antenna array elements, which are directed to two sides, to be radiated back to the direction of the array pointing angle well, does not cause interference to the antenna, and enables the antenna units of all the working frequency bands to obtain good port isolation degrees among ports under the condition that the array is miniaturized.

Description

Antenna array side reflecting element with isolating circuit and array antenna

Technical Field

The invention relates to a communication antenna, in particular to an antenna array side edge reflecting element with an isolating circuit and an array antenna.

Background

Along with the rapid development of the 5G communication technology, the miniaturization of the base station is more and more important, and along with the gradual reduction of the size of the base station, the distance between the array elements is gradually reduced, and the interference between the array elements is gradually increased; for a multiple-input multiple-output (MIMO) array formed by multiple rows of array element topologies, the distance between each row of array elements is gradually reduced, and the problem of interference among the array elements is solved

In order to solve the problem that antenna gain is low due to mutual interference among each row of antenna array elements in the array and the small size of the reflector plate, a plurality of scholars at home and abroad research the antenna array elements, and the corresponding method is mainly to arrange the side reflector plate on the side surface of each row of antenna array elements. The existing side wall reflecting plate usually takes the form of metal strip, and when the antenna units in the array are compactly arranged, the added side reflecting plate can cause interference among the antenna units in the same column. When there are dual polarized antennas for multiple frequency bands in the array, the side reflector plates can also interfere with antennas operating in other frequency bands. Therefore, when the array size is small, the conventional side reflector is gradually out of function, and the frequency band in which the reflector can work cannot meet the requirement of the array.

Disclosure of Invention

The invention aims to overcome the defect that the conventional side reflecting plate cannot meet the requirement of a miniaturized array antenna and provides an antenna array side reflecting element with an isolating circuit and an array antenna.

The technical scheme adopted by the invention for solving the technical problems is as follows: an antenna array side reflecting element with isolation circuitry, comprising:

the first filtering unit has a phase selection characteristic and is used for filtering electric fields of the same polarization and/or different polarizations of the different antenna radiation units in the same frequency band in an operating frequency band;

the radiator circuit is connected with the first filtering unit, receives the induced current filtered by the first filtering unit and generates a radio wave which is directionally radiated towards the radiation direction of the antenna;

and the grounding circuit is connected with the first filtering unit and/or the radiator circuit and is connected with the antenna ground plate.

The first filtering unit intercepts and filters currents in the same direction and/or currents in different phases with 90 degrees of phase difference formed by electric field waves of different antenna radiation units.

The antenna further comprises a second filtering unit with frequency selective characteristics, wherein when the first filtering unit works in a low frequency band, the second filtering unit works in a high frequency band and filters the electric field of the high frequency antenna radiation unit.

The radiator circuit comprises two directional radiators which are symmetrically arranged, a filter circuit is connected between the two directional radiators, and the filter circuit forms the first filter unit or the first filter unit and the second filter unit.

The radiator circuit also comprises a Vivaldi radiator which is arranged between the two directional radiators and is connected with the directional radiators on the two sides through two groups of filter circuits.

The radiating body circuit comprises two directional radiating bodies and two groups of strip line circuits which are symmetrically arranged, the two groups of strip line circuits are respectively connected with the two directional radiating bodies, each group of strip line circuits comprises two strip lines with different lengths, the two groups of strip line circuits are symmetrically arranged to form a dipole radiating body, and the two strip lines with different lengths in each group of strip line circuits are connected through a filter circuit; the filter circuit forms the first filter unit or forms the first filter unit and the second filter unit.

The radiator circuit and the filter circuit are respectively arranged at two sides of the dielectric substrate and connected through via holes on the dielectric substrate, and the two groups of strip line circuits are respectively connected with the two directional radiators through the connecting circuit and the via holes at the other side of the dielectric substrate.

The invention also provides an array antenna, wherein the antenna array side reflecting elements with the isolating circuits are arranged on two sides of the array antenna and between adjacent radiating element rows.

Further, the array antenna comprises a first radiating element working at a first frequency band and a second radiating element working at a second frequency band, wherein the frequency of the first frequency band is higher than that of the second frequency band; the antenna array side reflecting elements are divided into first reflecting elements arranged on two sides of the array antenna and between adjacent first radiating element rows and second reflecting elements arranged on two sides of the array antenna and between adjacent second radiating element rows; the first filter unit and the radiator circuit of the first reflection element operate in a first frequency band, and the first filter unit and the radiator circuit of the second reflection element operate in a second frequency band.

Furthermore, the radiator circuit comprises two symmetrically arranged directional radiators which are connected with a filter circuit in the form of the first filter unit.

The second reflecting element also comprises a second filtering unit with frequency selective characteristic, and the second filtering unit works in the first frequency band and filters the electric field of the first radiating unit.

The first reflection element and the second reflection element are arranged between adjacent first radiation unit columns and between adjacent second radiation unit columns, each radiator circuit comprises two directional radiators and two sets of strip line circuits, the two sets of strip line circuits are symmetrically arranged and connected with the two directional radiators respectively, each set of strip line circuit comprises two strip lines with different lengths, the two sets of strip line circuits are symmetrically arranged to form a dipole radiator, two strip lines with different lengths in each set of strip line circuits are connected through a filter circuit, and the filter circuit forms the first filter unit or the first filter unit and the second filter unit.

The first radiation unit and the second radiation unit are dual-polarized radiation units, the first reflection element is arranged on the oblique side of the first radiation unit, the second reflection element is arranged on the oblique side of the second radiation unit, and the centers of the first reflection element and the second reflection element are staggered in the direction perpendicular to the array.

The first reflecting elements and the second reflecting elements which are arranged between the adjacent first radiating element columns and between the adjacent second radiating element columns are arranged in a cascade mode and are coupled and connected with the antenna ground plate through corresponding grounding circuits.

The array antenna provided by the invention further comprises one or more columns of third radiating elements, wherein the columns of third radiating elements work in one or more frequency bands, and the working frequency band of the third radiating elements is different from the first frequency band and the second frequency band; the side reflecting element is further divided into third reflecting elements matched with the working frequency bands of the third radiation units.

The invention has the beneficial effects that: the first filtering unit of the side reflecting element can be used for filtering the electric wave interference with the same polarization or different polarizations between different antenna radiation units in the same or different rows of the same frequency band, so that each antenna in the array can work well in the working frequency band, and the radiation power, the half-power beam width, the front-to-back ratio and the cross polarization ratio are kept normal. The filtered residual current is directed by the radiator circuit to radiate back into the main radiation direction of the array to provide gain. The antenna is applied to a multi-frequency dual-polarized antenna, and can filter out electric wave interference, so that each antenna in the array can work well in a working frequency band. The radiator circuit of the side reflection element is used as a radiation unit on the side reflection band, and an array can be formed on the side reflection band, so that waves of each row of antenna array elements, which are emitted to two sides, can be well and directionally radiated by the side reflection band to the array pointing angle direction, interference on the antenna is avoided, and good port isolation can be obtained among ports of the antenna units of all working frequency bands under the condition that the array is miniaturized. The reflection band formed by the side reflection elements can control the half-power beam width of the main radiation beam to be 65+/-10 degrees under the condition of being close to the array elements, and the industrial level is reached.

Drawings

Fig. 1 is a schematic view of the topology of the side reflection element for the high frequency radiation unit in the base station antenna array.

Fig. 2 is a schematic diagram of the topology of the side reflection element for the low frequency radiation unit in the base station antenna array.

Fig. 3 is a schematic diagram of the topology of the side reflective elements in the base station antenna array for the dual-band antenna.

FIG. 4 is a schematic view of a first embodiment of a side reflective element.

FIG. 5 is a diagram of a first surface of a side reflective element according to a second embodiment.

FIG. 6 is a second surface view of a second embodiment of a side reflective element.

Fig. 7 is a schematic diagram of a dual-band antenna array 1 according to an embodiment of the present invention.

Fig. 8 is a graph showing simulation results of half-power beamwidth when a row of high-frequency radiating elements is excited in the embodiment shown in fig. 7.

Fig. 9 is a graph of simulation results of half-power beamwidth when the embodiment of fig. 7 excites an array of low frequency radiating elements.

Fig. 10 is a simulation result of the same-port isolation between the columns of the high-frequency radiating elements of the embodiment shown in fig. 7.

Fig. 11 is a simulation result of the same-port isolation between the columns of the low-frequency radiating elements of the embodiment shown in fig. 7.

Fig. 12 is a schematic diagram of another embodiment of a dual-band antenna array according to the present invention.

The labels in the figure are: 1. the antenna comprises a high-frequency radiation unit, a low-frequency radiation unit, a ground plate, an antenna ground plate, a first reflection element, a second reflection element, a high-frequency radiation unit, a low-frequency radiation unit, a high.

Detailed Description

The technical scheme of the invention is clearly and completely explained in the following by combining the attached drawings and the detailed description. The specific contents listed in the following examples are not limited to the technical features necessary for solving the technical problems described in the claims. Meanwhile, the list is that the embodiment is only a part of the present invention, and not all embodiments.

The antenna array side reflecting element with the isolation circuit comprises a first filtering unit, a radiator circuit and a grounding circuit. The first filter unit and the radiator circuit operate at corresponding frequency bands according to the radiation unit targeted by the side reflection element. The first filtering unit for the high-frequency radiating unit works in a higher frequency band, and the first filtering unit for the low-frequency radiating unit works in a lower frequency band. The first filtering unit is used for filtering electric field interference among different radiating units in a working frequency band, and the radiator circuit is connected with the first filtering unit, receives induced current filtered by the first filtering unit, generates electric waves with the same polarization as incoming waves, and radiates directionally towards the antenna radiation direction.

The first filtering unit has a phase selection characteristic and filters electric fields of the same polarization and/or different polarizations of the antenna radiation units in the same frequency band and different frequency bands in an operating frequency band. For example, the electric field between the same polarization or the electric field between different polarizations of two columns of antennas is filtered, or the electric field between different polarizations of adjacent radiation units in the same column is filtered to improve the isolation of ports with different polarizations. When the electric field is transmitted from two opposite places and induced current is formed on the circuit structure of the side reflecting element, the in-phase current is intercepted and filtered by one part of the first filtering unit, the current with the phase difference of 90 degrees is intercepted and filtered by the other part of the first filtering unit, and the rest current flows to the radiator circuit and generates electric waves with the same polarization as the incoming waves, and the electric waves are radiated directionally towards the radiation direction of the base station.

For the side reflection element applied to the dual-band or multi-band antenna, since the position of the side reflection element for the low-band antenna radiation unit is generally higher, when the base station operates in a higher frequency band, a part of the circuit in the side reflection element for the low frequency is higher than that of the high-band antenna radiation unit, and therefore, an electric field of a part of the frequency band is inevitably applied to the circuit structure. The side reflecting element can also be provided with a second filtering unit for filtering different frequency bands, has frequency selection characteristics, and can intercept and filter induced current formed by a radiation electric field of the high-frequency antenna radiation unit.

The grounding circuit is used for connecting the side reflection element with the antenna ground plate, the first part of the grounding circuit is used for connecting the related circuit structure in the side reflection element, and the part can be only connected with the circuit structure which is necessarily grounded and can separately connect the circuit structures of all parts as far as possible so as to avoid changing the current path. The other part of the grounding circuit is coupled with the antenna ground plate, and the influence of the current on other modules of the base station can be ensured to be as small as possible by adopting the coupling grounding, and the influence on the third-order intermodulation of the base station is as small as possible.

In the embodiment shown in fig. 4, the radiator circuit comprises two symmetrically arranged directional radiators 6 and one vivaldi radiator 7. The vivaldi radiator is arranged between the two directional radiators 6 and is connected to the directional radiators on both sides via two sets of filter circuits 8. The two groups of filter circuits 8 in the form of the bent line type band elimination filters form the first filter unit and are responsible for intercepting and filtering electric field waves with different polarizations from different antenna radiation units in the same row of antenna arrays, so that 45-degree polarization electric field signals and-45-degree polarization electric field signals of the antenna cannot interfere with each other after reaching a reflection boundary, and further, the isolation between different polarization ports between the antennas in the same row cannot be deteriorated due to the use of side reflection elements.

In this embodiment, the directional radiator 6 is a circular radiator, and the radiation direction of the directional radiator can be changed by changing the position of the current feed into the radiator and the length and width of the radiator. The directional radiator 6 may be a square, square ring, circular ring, double rings with different lengths and widths, or the like.

According to actual requirements, the structure and implementation of the filter circuit 8 can be changed, so that the filter circuit can also filter the electric field between the same polarizations of different antenna radiation units, or simultaneously implement a second filter unit.

The directional radiator 6 and the vivaldi radiator 7 are responsible for reflecting the beam, according to simulation, the radius of the directional radiator 6 is made to be a proper size in a certain frequency band, when the directional radiator is excited at a certain position on the directional radiator, the radiation beam direction can be greatly deflected in the range from the side direction to the axial direction of the directional radiator, and the gain of the main radiation direction can reach about 5 dBi. By using directional radiators, the laterally incident electric waves can be directionally radiated back to the main radiation direction of the array, so that the gain is as high as possible. By using the Vivaldi antenna radiator, the electric wave can be further radiated along the main radiation direction of the array, so that the half-power beam width and the gain of the base station antenna can be controlled. By combining the filter circuit, the directional radiator and the Vivaldi radiator, the isolation between array element ports of the array antenna cannot be deteriorated under the condition of using lower cost, and the beams which are directed to two sides of the antenna can be radiated back to the main radiation direction of the base station antenna under the condition of array miniaturization, so that the antenna is suitable for the use of various base station antennas in the current market.

In the embodiment shown in fig. 5 and 6, the radiator circuit comprises two symmetrically arranged directional radiators 6 and two sets of stripline circuits 9, which are arranged on one side of a dielectric substrate 11. The two directional radiators 6, which are symmetrical with respect to the center of the structure, operate in a similar manner to the embodiment shown in fig. 4, and when they receive the current from the strip line, they radiate directionally to the main radiation direction of the array. Each group of strip line circuits comprises two strip lines with different lengths, wherein the two strip lines with different lengths are used for current transmission on the one hand, the strip line with longer length is used for current transmission of a lower frequency band in a working frequency band, and the strip line with shorter length is used for current transmission of a higher frequency band in the working frequency band. In the two groups of strip line circuits, two longer strip lines and two shorter strip lines are symmetrical about the center of the structure, and can form a dipole radiator to reflect waves.

As shown in fig. 6, the other surface of the dielectric substrate 11 is provided with two sets of filter circuits 8 and two symmetrical and vertically arranged connecting circuits 10. The two groups of filter circuits 8 are respectively connected with two strip lines with different lengths in the two groups of strip line circuits on the other surface of the dielectric substrate through the through holes. One end of the connection circuit 10 is connected to a strip line of a strip line circuit having a longer length through a via hole, and the other end is connected to the directional radiator 6 through a via hole. The current feed into the position of the directional radiator can be controlled by adjusting the position of the via hole connected with the directional radiator 6, thereby achieving the effect of controlling the current distribution on the radiator. The impedance matching and radiation direction of the directional radiator are determined by the position of the via hole and the radius of the radiator. Adjusting the length and width of the connecting circuit 10 controls the phase and impedance of the radio wave when it reaches the directional radiator.

The two filter circuits 8 shown in fig. 6 adopt a high-order filter circuit structure composed of a plurality of meander lines with different lengths, widths and widths, which is equivalent to a high-order band-stop filter, and can be used for different frequency bands by controlling the size of the high-order band-stop filter, so that the high-order band-stop filter can be used for filtering out unwanted electric waves in the working frequency band of the high-order band-stop filter and can also be used for filtering out cross-band interference waves brought by other frequency bands. The filter circuit may be used to form the first filter unit or to form the first filter unit and the second filter unit, as desired.

The specific form of the first filtering unit and the second filtering unit is set according to actual needs, and is not limited to the above embodiments. For example, a high-order band-stop filter circuit is manufactured by realizing various sizes of bent strip lines or cascading the bent strip lines and straight broadband lines, or element devices capable of realizing inductance characteristics and capacitance characteristics are combined into a series-parallel connection mode, and the broadband filtering purpose is achieved by combining different parameters. For the bending strip lines, it is not limited to the bending lines on the same plane, and any method of uniformly or non-uniformly distributing the bending lines with different sizes in different spaces, or distributing the bending lines in different layers on the dielectric substrate, or using the lines/metal tubes distributed in a spiral/sine/cosine manner in the plane or space to manufacture the bending line/bending metal tube combinations with different size parameters shall be covered in the protection scope of the present application.

Fig. 1 illustrates an embodiment of an array of high frequency radiating elements and an arrangement of side reflective elements on two sides of the array. In the embodiment, the high-frequency radiation units are +/-45-degree dual-polarization radiation units, the electric field polarization direction of each radiation unit is towards +/-45-degree direction of the array, so that electric field waves can be received in +/-45-degree direction of the radiation units to the maximum, and therefore, the side reflection elements are preferably arranged in +/-45-degree direction of the radiation units, and the reflection or filtering effect is better. If the side reflective elements are placed on both sides of the radiation unit, and a line connecting the structural center of the side reflective elements and the structural center of the radiation unit is radially parallel with respect to the array, that is, the side reflective elements are located in the direction of 90 ° of the radiation unit, when the radiation unit is excited, a current reaches the end of a radiator responsible for a certain polarization, is radiated onto the side reflective elements, is transmitted to the other end through one end of the side reflective element, and is finally radiated onto the end of a radiator responsible for another polarization, thereby causing a change in the current path of the radiation unit, and causing a deterioration in the isolation at the operating frequency band. Therefore, even if the side reflecting element cannot be completely disposed in the +/-45 ° direction of the radiating unit due to spatial position limitation, it should be avoided to be disposed in the 90 ° direction of the radiating unit with the side reflecting element disposed on the oblique side of the high-frequency radiating unit. Two side reflection components are respectively responsible for one of the polarization electric fields on the high-frequency radiation unit, and a certain distance is kept between the two polarization electric fields, so that the isolation of two ports of the LPA array element can not be deteriorated.

When the side reflecting elements are arranged on two oblique sides of the radiating unit, a certain polarization port of the radiating unit is excited, generated currents are transmitted to one end, close to the oscillator, of the side reflecting element through the tail end of the radiator, if no filter is arranged, the currents flow to the other end of the side reflecting element and are radiated to the radiator of the other radiating unit close to the end, and therefore standing waves of the radiating unit are affected.

Fig. 2 shows an embodiment of an array of low frequency radiating elements and the arrangement of side reflective elements on both sides of the array. As in the embodiment of fig. 1, the side reflective elements should also be disposed diagonally to the low frequency radiating elements.

Fig. 3 shows an embodiment of the arrangement of the side reflective elements of the dual-band antenna. There are two columns of high frequency radiating elements 1 and one column of low frequency radiating elements 2. Two rows of first reflecting elements 4 are respectively arranged at two sides of the array antenna and respectively correspond to two rows of high-frequency radiating units 1. The first reflecting elements 4 in the middle column are arranged in conjunction with the arrangement position of the low-frequency radiation unit 2, while following the above rule. The second reflecting elements 5 for the low-frequency radiating units 2 are arranged on two sides of the array antenna according to the above rule, and the centers of the second reflecting elements 5 and the centers of any high-frequency radiating units 1 are not on the same array vertical plane and are staggered in the direction vertical to the array.

Fig. 7 is a schematic diagram of a first embodiment of a dual-band antenna array using side reflective elements according to the present invention. It comprises 4 columns of high-frequency radiating elements 1 and two columns of low-frequency radiating elements 2. The high-frequency radiation unit 1 is a first radiation unit and works in a first frequency band of 1.4-2.7 GHz, and the low-frequency radiation unit 2 is a second radiation unit and works in a second frequency band of 0.69-0.96 GHz. The distance between the central points of the low-frequency radiating unit 2 is only 120mm, the distance between the central points of the high-frequency radiating unit 1 is only 110mm, when the array works at 0.69-0.96 GHz and 1.4-2.7 GHz, if no side reflecting element is arranged, the interference between two arrays of array elements is very large, so that any array element can not well independently complete the respective work, especially when the array works at 0.69-0.75 GHz and 1.4-1.9 GHz, the half-power beam width (HPBW) of a directional diagram is larger than 90 degrees, the isolation is about-15 dB, and the antenna index of a base station can not be reached.

As shown in fig. 7, the respective side reflective elements are arranged on both sides of the array antenna and between the columns according to the above rule, and are divided into the first reflective element 4 for the high frequency radiation unit 1 and the second reflective element 5 for the low frequency radiation unit 2. The first filter unit and the radiator circuit of the first reflective element 4 operate in a first frequency band, and the first filter unit and the radiator circuit of the second reflective element 5 operate in a second frequency band.

In this embodiment, the first and second

reflective elements

4, 5 disposed on either side of the array antenna may take the form of the embodiment shown in fig. 4. By changing the size and structure of the related circuit, the related circuit can be operated in the corresponding frequency band. For example, the filter circuit 8 in the form of a meander-line band-stop filter in the figure is reduced to the size required for the high-frequency radiating element 1 to serve as a first filter unit for the first reflecting element 4, and increased to the size required for the low-frequency radiating element 2 to serve as a first filter unit for the second reflecting element 5. The filter circuit 8 in the form of a meander-line band-stop filter is shown to be primarily used to improve the isolation between ports of different polarizations between adjacent array elements in the same column.

The vivaldi radiator has a wide operating band and a wide radiation band, and thus can be applied to a wide frequency band. Because the array size is smaller, the height of the array element is lower, the wave beam of the antenna is wider when the antenna works at 0.69-0.75 GHz and 1.4-1.7 GHz, the gain in the direction of the pointing angle is lower, and the set directional radiator carries out directional radiation in the frequency band towards the array radiation direction, so that the wave widths of 0.69-0.75 GHz and 1.4-1.7 GHz are reduced, and the wave widths of 0.76-0.96 GHz and 1.71-2.7 GHz are not influenced. By changing the structural size of the directional radiator and the position of the feed point, the directional radiator can be applied to the first reflecting element 4 or the second reflecting element 5.

The first reflective element 4 and the second reflective element 5 arranged between adjacent columns may take the form of the embodiments shown in fig. 5 and 6. The current structure in the diagram can be changed to work in the corresponding frequency band. For the two groups of strip line circuits 9 with different lengths which are symmetrical about the center of the structure, the two groups of strip line circuits can not only be used as transmission circuits, but also be used as dipole radiators to reflect electric fields back, so that the radiation frequency bands can be controlled by modifying the lengths of the upper strip line and the lower strip line, and the strip line circuits can work in two frequency bands of 0.69-0.96 GHz and 1.4-2.7 GHz when the array works. The length difference exists between the two arms by modifying the length of the strip line of the equivalent dipole radiator, so that the radiation direction of the two arms can be changed, and the effect of directional radiation is achieved. Similarly, the size of the directional radiator and the position of the via hole in the drawing are modified, and the radiation direction and the working frequency band can also be changed. By changing the size and circuit order of the high-order band-resistance filter circuit 8 in fig. 6, the requirements of the first filter unit in the first reflecting element 4 and the second reflecting element 5 can be met, and electric field filtering between the same polarization of two rows of antennas and electric field filtering between different polarizations of two rows of antennas can be realized according to requirements.

In the embodiment shown in fig. 7, every two first reflecting elements 4 and one second reflecting element 5 for the low-frequency radiating elements 2 in the middle of two columns of high-frequency radiating elements 1 are placed on a dielectric substrate, the second reflecting element 5 for the lower frequency band is arranged above or obliquely above the first reflecting element 4 for the higher frequency band, and the currents of the three modules are guided from two sides or the middle to the ground circuit below the structure in a strip line cascade manner and are finally coupled with the antenna ground plate 3. In the second reflection element 5 for the low-frequency radiation unit 2, which is arranged between the columns, a second filter unit is also provided, which can likewise be realized with a filter circuit 8.

In the embodiment shown in fig. 7, the side reflecting elements are arranged to filter out interference between any two arrays of array elements, and radiate the electric waves directed to both sides back to the main radiation direction of the array without interfering with other array elements and the array elements in the array operating in other frequency bands. When the middle row of high-frequency radiation units is excited, the half-power beam width of the array radial pattern is shown in the graph of fig. 8 along with the frequency, and when the left row of low-frequency radiation units is excited, the half-power beam width of the array radial pattern is shown in the graph of fig. 9 along with the frequency. The isolation between the high and low frequency columns is shown in fig. 10 and 11. Under the condition of array miniaturization, the side reflection element of the invention is utilized to form a side reflection band, so that the half-power beam width of the antenna working on a higher frequency band is kept at 65 degrees +/-5 degrees, the half-power beam width of the antenna working on a lower frequency band is kept at 70 degrees +/-5 degrees, a filter circuit structure carried on the side reflection band enables the isolation degree of each port among antennas in different rows of all working frequency bands of the array to be below-25 dB, each antenna in the array can work well in the working frequency bands, and the radiation power, the half-power beam width, the front-to-back ratio and the cross polarization ratio are kept normal. The material used in the above experiment is an inexpensive FR4 series dielectric substrate having a dielectric constant of 4.4 to 5.2, and if a dielectric substrate having a higher accuracy and a smaller loss such as ROGERS 5880 is used, the effect of this technique is more excellent.

Fig. 12 is another embodiment of a dual-band antenna. The array is composed of 16 high-frequency radiation units working at 1.4-2.7 GHz and 8 low-frequency radiation units working at 0.69-0.96 GHz, the arrangement mode of the array is different from that of the embodiment shown in the figure 7, each array element can well work at 0.69-0.96 GHz and 1.4-2.7 GHz, and the directional diagram is kept normal.

The above is directed to the embodiment of the dual-band array antenna, and when three or more frequency bands exist in the antenna array, that is, in addition to the first and second radiating elements operating in the first and second frequency bands, the antenna array further includes one or more rows of third radiating elements, where the rows of third radiating elements operate in the radiating elements of the third frequency band, or operate in the radiating elements of the third, fourth, or even more frequency bands, respectively. The side reflecting element should be further divided with a third reflecting element matched with the operating band of the third radiating element. The specific form and the position of the third reflecting element follow the above principle, and the structural size of the third reflecting element can be adapted to the required frequency band, and the third reflecting element can be used for the radiating unit of each frequency band and can work in each frequency band without causing any interference to the antenna working in other frequency bands due to the side reflecting element.

The side reflecting element can be realized by coating copper on the dielectric substrate and directly using a metal element. Through laboratory test, if use the metallic structure of various shapes such as aluminium strip, aluminum sheet, aluminum plate to realize circuit structure, its material thickness homoenergetic realizes good effect in 1~3mm, promptly: under the condition that the distance of each array is slightly smaller than 1/4 lambda wavelength of working array elements, namely the array is miniaturized, the working of any array element in the array cannot influence any array elements of other arrays, and the port isolation between each array element is smaller than-25 dB.

The realization mode of side reflection component need not any welding point, and the bottom accessible is placed plastic base or metal base and is fixed on basic station merit minute board with the screw, realizes that the side reflection area can be inserted and pulled, if use the higher slide bar loading plastic base of nimble degree to fix the side reflection area, can also realize the axial displacement in reflection area, makes the reflection area topological position intelligence adjustable. The size of the side reflection band is only 117mm 60mm 1mm at most, the material is cheap, the process is simple, and the side reflection band is suitable for mass production.

The above description of the embodiments is only for the purpose of helping to understand the technical idea of the present invention and its core idea, and although the technical solution is described and illustrated by using the specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made therein by those skilled in the art without departing from the technical spirit of the present invention. Such modifications and substitutions are intended to be included within the scope of the present invention.

Claims

1. An antenna array side reflecting element with an isolation circuit is characterized in that: the method comprises the following steps:

2. The antenna array side reflector element with isolation circuitry of claim 1, wherein: the first filtering unit intercepts and filters currents in the same direction and/or currents in different phases with 90 degrees of phase difference formed by electric field waves of different antenna radiation units.

3. The antenna array side reflecting element with isolation circuits of claim 1, wherein: the antenna further comprises a second filtering unit with frequency selection characteristics, wherein when the first filtering unit works in a low frequency band, the second filtering unit works in a high frequency band and filters the electric field of the high frequency antenna radiation unit.

4. An antenna array side reflector element with isolation circuitry as claimed in any one of claims 1 to 3, wherein: the radiator circuit comprises two directional radiators (6) which are symmetrically arranged, a filter circuit (8) is connected between the two directional radiators, and the filter circuit forms the first filter unit or the first filter unit and the second filter unit.

5. The antenna array side reflecting element with isolation circuit of claim 4, wherein: the radiator circuit also comprises a Vivaldi radiator (7) which is arranged between the two directional radiators (6) and is connected with the directional radiators on the two sides through two groups of filter circuits (8).

6. An antenna array side reflector element with isolation circuitry as claimed in any one of claims 1 to 3, wherein: the radiator circuit comprises two directional radiators (6) and two groups of strip line circuits (9), the two groups of strip line circuits are symmetrically arranged and are respectively connected with the two directional radiators, each group of strip line circuits comprises two strip lines with different lengths, the two groups of strip line circuits are symmetrically arranged to form a dipole radiator, and the two strip lines with different lengths in each group of strip line circuits are connected through a filter circuit (8); the filter circuit forms the first filter unit or forms the first filter unit and the second filter unit.

7. The antenna array side reflecting element with isolation circuits of claim 6, wherein: the radiator circuit and the filter circuit are respectively arranged on two sides of the dielectric substrate (11) and connected through via holes in the dielectric substrate, and the two groups of strip line circuits (9) are respectively connected with the two directional radiators (6) through the connecting circuit (10) on the other side of the dielectric substrate and the via holes.

8. An array antenna, characterized by: antenna array side reflecting elements with isolation circuits according to claim 1 or 2 are provided on both sides of the array antenna and between adjacent columns of radiating elements.

9. An array antenna as claimed in claim 8, wherein: the antenna comprises a first radiating element and a second radiating element, wherein the first radiating element works in a first frequency band, and the second radiating element works in a second frequency band, and the frequency of the first frequency band is higher than that of the second frequency band; the antenna array side reflecting element is divided into a first reflecting element (4) arranged between two sides of the array antenna and the adjacent first radiating element row and a second reflecting element (5) arranged between two sides of the array antenna and the adjacent second radiating element row; the first filter unit and the radiator circuit of the first reflection element operate in a first frequency band, and the first filter unit and the radiator circuit of the second reflection element operate in a second frequency band.

10. An array antenna as claimed in claim 9, wherein: the array antenna comprises a first reflection element (4) and a second reflection element (5) which are arranged on two sides of the array antenna, a radiator circuit comprises two symmetrically arranged directional radiators (6), and a filter circuit (8) in the form of a first filter unit is connected between the two directional radiators.

11. An array antenna as claimed in claim 10, wherein: the radiator circuit further comprises a Vivaldi radiator (7) which is arranged between the two directional radiators (6) and is connected with the directional radiators (6) on the two sides through the two groups of filter circuits.

12. An array antenna as claimed in claim 9, wherein: the second reflecting element (5) further comprises a second filtering unit with frequency selective characteristics, wherein the second filtering unit works in the first frequency band and filters the electric field of the first radiating unit.

13. An array antenna as claimed in claim 12, wherein: the setting is in first reflection element (4) and second reflection element (5) between adjacent first radiating element row and between adjacent second radiating element row, the irradiator circuit including two directional irradiators (6) and two sets of band circuit (9) that the symmetry set up, two sets of band circuit link to each other with two directional irradiators respectively, every group band circuit all includes the band line that two length are different, two sets of band circuit symmetries set up and form dipole irradiator, the band line that two length differences in every group band circuit pass through filter circuit (8) and connect, filter circuit forms first filter unit or formation first filter unit and second filter unit.

14. An array antenna as claimed in claim 13, wherein: the radiator circuit and the filter circuit are respectively arranged on two sides of the dielectric substrate (11) and connected through via holes on the dielectric substrate, and the two groups of strip line circuits (9) are respectively connected with the two directional radiators (6) through the connecting circuit (10) and the via holes on the other side of the dielectric substrate.

15. An array antenna as claimed in claim 9, wherein: the first radiation unit and the second radiation unit are dual-polarized radiation units, the first reflection element (4) is arranged on the oblique side of the first radiation unit, the second reflection element (5) is arranged on the oblique side of the second radiation unit, and the centers of the first reflection element and the second reflection element are staggered in the direction perpendicular to the array.

16. An array antenna as claimed in claim 15, wherein: the first reflecting elements and the second reflecting elements which are arranged between the adjacent first radiating element columns and between the adjacent second radiating element columns are arranged in a cascade mode and are in coupling connection with the antenna ground plate through corresponding grounding circuits.

17. An array antenna as claimed in any one of claims 9 to 16, wherein: the antenna also comprises one or more columns of third radiating elements, wherein the columns of third radiating elements work in one or more frequency bands, and the working frequency band of the third radiating elements is different from the first frequency band and the second frequency band; the side reflective isolation element is further divided into a third reflective element matched with the working frequency band of the third radiation unit.