CN113937465B - Dual-polarized electromagnetic transparent antenna and method for realizing dual-frequency scattering suppression - Google Patents

Abstract

The invention discloses a dual-polarized electromagnetic transparent antenna and a method for realizing dual-frequency scattering suppression, comprising four dipole arms, a dielectric substrate, a first and a second balun and a reflection plate; the first and second baluns are intersected to form It is a balun group, perpendicular to the reflector, the dielectric substrate is fixed on the top of the balun group, and the four vibrator arms are designed to form a cross-shaped structure on the dielectric substrate, forming two pairs of vibrator arm groups, the first balun and one of them The two dipole arms of the vibrator arm group are electrically connected, and the second balun is electrically connected with the two dipole arms of the other dipole arm group; each dipole arm is divided into at least two arm sections, and two adjacent arms The sections are connected by a decoupling device, and at least one open resonant groove is etched on the arm section. The invention can effectively reduce the radar scattering cross section of the antenna working in the first frequency band in the second frequency band and the third frequency band, thereby suppressing the scattering interference generated by the antenna working in the first frequency band to the antenna working in the second frequency band and the third frequency band.

Description

A dual-polarized electromagnetic transparent antenna and its method for realizing dual-frequency scattering suppression

technical field

The invention relates to the technical field of wireless communication, in particular to a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics and a method for realizing dual-frequency scattering suppression.

Background technique

With the rapid development of the fifth generation (5G) mobile communication technology, the 5G communication system will inevitably coexist with the traditional 2G/3G/4G network for a long time. The 5G antenna has a high operating frequency, so its operating wavelength is relatively short, resulting in fast signal attenuation and being easily blocked by buildings. Compared with traditional 2G/3G/4G systems, more 5G base stations need to be built to improve the coverage of 5G signals. Adopting the method of independent station construction will greatly increase the construction and operation costs of 5G base stations, and will also exacerbate the shortage of base station site resources.

It is well known in the industry that multi-band common-aperture antennas can be obtained by placing antenna units or array antennas operating in different frequency bands in a specific space and sharing a reflector and a radome. The multi-band common-aperture antenna can make full use of the design space of the antenna. While providing more standards and more diversified services, it will not increase the physical size of the antenna array, thereby reducing the number of antenna arrays, reducing antenna procurement, The cost of maintenance and space leasing will help alleviate the current shortage of base station antenna site resources. Realize the integrated design of 5G antennas and existing 2G/3G/4G antennas, and make full use of existing site resources to deploy 5G antennas, thereby avoiding repeated construction of 5G base station antennas, thereby greatly reducing operators' 5G construction and operating costs .

The distance between different antenna units or antenna arrays in the multi-band common-aperture antenna is small, so that more antenna elements can be placed in a limited design space, thereby reducing the overall cost of the antenna, which leads to the existence of multi-frequency common-aperture antennas Strong electromagnetic interference, in which the cross-band scattering interference generated by the lower frequency band antenna to the higher frequency band antenna is the strongest, which will cause serious distortion of the radiation direction of the higher frequency band antenna. At present, cross-band scattering suppression has become a difficult point in the design of multi-band common-aperture antennas. The key to suppressing cross-band scattering interference is to design low-frequency antennas that are electromagnetically transparent to higher-frequency antennas.

For a multi-system fusion antenna integrating a 5G antenna and a traditional 2G/3G/4G antenna, it usually consists of sub-antennas or sub-arrays working in three different frequency bands, so it can be called a three-band common-aperture antenna. The working frequency bands of different sub-antennas or sub-arrays in the three-band common-aperture antenna are the first frequency band, the second frequency band, and the third frequency band, wherein the frequency of the first frequency band is lower than the frequency corresponding to the second frequency band and the third frequency band, and the second The frequencies of the frequency bands are lower than the frequencies of the third frequency band. The antenna element working in the first frequency band has a relatively large geometric size, which will inevitably cause scattering interference to the antennas working in the second and third frequency bands. Therefore, it is necessary to design an electromagnetic transparent antenna working in the first frequency band. The antenna should have dual-frequency scattering suppression characteristics, which can suppress its scattering interference to antennas working in the second and third frequency bands. The antenna is electromagnetically invisible to antennas working in the second and third frequency bands, so it is called Electromagnetically transparent antenna with dual-frequency scattering suppression properties.

Contents of the invention

The first purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics, which can effectively reduce the antenna working in the first frequency band in the second frequency band and the second frequency band. The radar scattering cross section in the three frequency bands can effectively suppress the scattering interference generated by the antennas working in the first frequency band to the antennas working in the second frequency band and the third frequency band.

The second object of the present invention is to provide a method for dual-polarized electromagnetic transparent antennas to suppress dual-frequency scattering.

The first object of the present invention is achieved through the following technical solutions: a dual-polarized electromagnetic transparent antenna, which operates in the first frequency band, but can simultaneously achieve scattering suppression in the second frequency band and the third frequency band, the first The frequency of the frequency band is lower than the frequency corresponding to the second frequency band and the third frequency band, and the frequency of the second frequency band is lower than the frequency corresponding to the third frequency band; the antenna includes four dipole arms, a dielectric substrate, a first balun, a second Balun and reflector; the first balun and the second balun intersect each other to form a balun group, and are vertically fixed on the reflector, the dielectric substrate is fixed on the top of the balun group, and the four oscillators The arms are designed on the dielectric substrate to form a cross-shaped structure, and the two dipole arms on the same straight line form a pair of dipole arm groups, and the four dipole arms form two pairs of dipole arm groups. These two pairs of dipole arm groups are used to generate radiation of different polarizations, the first balun is electrically connected to the two dipole arms of one pair of dipole arm groups, and the second balun is electrically connected to the two dipole arms of the other pair of dipole arm groups; each The vibrator arm is divided into at least two arm sections, and two adjacent arm sections are connected by a decoupling device, the induced current working in the second frequency band is mainly distributed on the decoupling device, and the decoupling device is equivalent to an inductor, its Together with the arm section, it is equivalent to a low-pass or band-stop filter, which can prevent the induced current of the second frequency band from propagating on the vibrator arm, thereby achieving scattering suppression in the second frequency band; each arm section is etched with at least one In the open resonant slot, the induced current of the third frequency band distributed on the arm section is mainly concentrated near the open resonant slot and reversed, and the scattering field generated by the reverse induced current can be self-cancelled, so that the scattering suppression can be realized in the third frequency band.

Further, by adjusting the size of the decoupling device and the open resonant slot, the operating frequency bands of the second frequency band and the third frequency band can be independently controlled, thereby realizing dual-frequency scattering suppression.

Further, the vibrator arm is a bar-shaped dipole arm or a ring-shaped dipole arm (including but not limited to deformation structures such as circular rings, square rings, and polygonal rings).

Further, the decoupling device is a thin metal wire.

Further, the decoupling device is composed of a thin metal wire and two co-toe capacitors, the two co-toe capacitors are connected to both ends of the thin metal wire, and the gap between the two co-toe capacitors is equivalent to a plate capacitor.

Further, the thin metal wire is a straight line, or a U-shaped bent thin metal wire, or a multi-bend thin metal wire that has been bent multiple times.

Further, the reflector is a metal reflector or a dielectric substrate covered with a metal material.

Further, the vibrator arm is a metal casting or made of a printed circuit board.

The second object of the present invention is achieved through the following technical solutions: a method for dual-polarized electromagnetic transparent antennas to achieve dual-frequency scattering suppression, specifically as follows:

Firstly, by dividing the dipole arm into at least two arm sections, thereby reducing the radar scattering cross section of the dipole arm in the second frequency band, and then installing decoupling devices (such as bent thin metal wires) between adjacent arm sections , while further reducing the radar cross section of the dipole arm in the second frequency band, it helps to improve the impedance matching characteristics of the antenna. Finally, at least one open resonant slot is etched on each arm section. The number of open resonant slots should be as far as possible In order to cover the entire arm section as much as possible, etching the open resonant slot can self-cancel the scattering field generated by the induced current in the third frequency band on the vibrator arm, thereby significantly reducing the radar scattering cross section of the vibrator arm in the third frequency band, Finally, the antenna can realize the reduction of the radar cross-section in the second frequency band and the third frequency band at the same time, so as to achieve the purpose of dual-frequency scattering suppression.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. Compared with the existing cross-band scattering suppression technology, the present invention can realize dual-frequency scattering suppression, and the two scattering suppression frequency bands are independently adjustable.

2. Compared with the existing cross-band scattering suppression technology, the present invention divides the dipole arm of the first frequency band antenna into shorter arm sections to reduce the radar scattering cross section of the dipole arm in the second frequency band. A decoupling device can be installed between them to improve the impedance matching characteristics of the antenna in the first frequency band, and at the same time further reduce the radar cross section of the dipole arm in the second frequency band. The form of the decoupling device is flexible and changeable.

3. Compared with the existing cross-band scattering suppression technology, the arm section of the present invention is etched with an open resonant slot, and the open resonant slot has good frequency selectivity, which can significantly reduce the vibration of the vibrator arm in the third frequency band. Radar cross section without degrading the impedance matching performance of the first band antenna.

4. Compared with the existing cross-band scattering suppression technology, the present invention has stronger applicability, and it is not sensitive to conditions such as array size, array element spacing, and frequency ratio of multi-frequency common-aperture antennas.

5. Compared with the existing cross-band scattering suppression technology, the decoupling device used in the present invention can be perfectly combined with the vibrator arm; compared with the existing technology (such as three-dimensional electromagnetic transparent cloak), the present invention can better ensure the product High production and assembly accuracy, and at the same time help to ensure the consistency of antenna performance.

6. Compared with the existing cross-band scattering suppression technology, the present invention does not need additional devices such as metal spacers and directors to improve the radiation characteristics of high-frequency antennas, which can significantly reduce the difficulty of product development, assembly, and assembly , which helps to improve the consistency of product performance.

Description of drawings

FIG. 1 is a perspective view of a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 1. FIG.

Fig. 2 is a top view of a dielectric substrate and orthogonal dipole arms (201a-201d) located on the dielectric substrate of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 1.

FIG. 3 is a schematic structural diagram of one of the dipole arms of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 1. FIG.

Fig. 4 is the design process of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristic in embodiment 1; Ant-L1 is a half-wave electric dipole antenna working in the first frequency band, and it comprises two equal lengths Vibrator arm; Ant-L2 can be obtained by dividing each vibrator arm of Ant-L1 into two shorter arm sections; a bent U-shaped thin metal is installed between adjacent arm sections of Ant-L2 line, Ant-L3 can be obtained; at least one open resonant groove is etched on each arm section of Ant-L3, and finally Ant-L4 is obtained; The two dipole arms (201a and 201c) of the electromagnetic transparent antenna are composed; the miniaturization of the opening resonance slot can be realized by using the bending opening resonance slot, so that enough opening resonance slots can be etched on the arm section, and the opening can be increased moderately The number of resonant slots can effectively expand the scattering suppression bandwidth.

Figure 5 shows the monostatic radar cross section (RCS: radar cross section) of half-wave electric dipole antennas (Ant-L1, Ant-L2, Ant-L3, Ant-L4) in the second and third frequency bands ).

FIG. 6 shows the S-parameter characteristics of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 1.

FIG. 7 is a perspective view of a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 2. FIG.

Fig. 8 is a top view of a dielectric substrate (302) and orthogonal dipole arms (202a-202d) located on 302 of a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 2.

Fig. 9 is a schematic structural diagram of one dipole arm (202a) of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 2.

Fig. 10 is a perspective view of a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 3.

Fig. 11 is a top view of a dielectric substrate (303) and orthogonal dipole arms (203a-203d) located on 303 of a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 3.

Fig. 12 is a schematic structural diagram of one dipole arm (203a) of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 3.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Example 1

As shown in Figure 1 and Figure 2, this embodiment provides a dual-frequency scattering suppression implementation scheme, and provides a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics ("electromagnetic transparency" refers to the antenna The radar cross-section in a specific frequency band is very small, so that the antenna is electromagnetically invisible to antennas operating in the specific frequency band), the antenna 101 includes a dielectric substrate 301, a reflector 501, a balun 401a, 401b and two pairs of orthogonal dipole arms, wherein 201a and 201c generate +45° polarized radiation for one pair of dipole arms, and 201b and 201d generate -45° polarized radiation for the other pair of dipole arms. The dipole arms 201a-201d are designed on the dielectric substrate 301, the dielectric substrate 301 is fixed on the top of two orthogonal baluns 401a, 401b, the balun 401a is electrically connected with the dipole arms 201a, 201c, and the balun 401b is connected with the dipole arms 201b, 201d is electrically connected, and the two baluns 401a and 401b are vertically fixed on the reflector 501 .

As shown in FIG. 3 , it is a structural schematic diagram of the vibrator arm 201a. The dipole arms 201b, 201c, 201d have the same structure and size as the dipole arm 201a; the dipole arm 201a is divided into two shorter arm sections (601a and 601b ), a U-shaped bent thin metal wire 801a is installed between two adjacent arm sections, and the size of the arm section is far away from the resonant electrical length of the second frequency band antenna, so the dipole arm of the first frequency band antenna is segmented The strength of the induced current in the second frequency band can be weakened. The U-shaped bent thin metal wire and the arm section together form a filter, which can prevent the induced current in the second frequency band from propagating between the arm sections. Therefore, this measure can be used in In the second frequency band, the radar scattering cross section is significantly reduced, and the number of arm sections can be adjusted appropriately according to specific conditions; the arm sections 601a and 601b are respectively etched with open resonant slots 701a-701c and 701d-701f, and the opening resonant slots The quantity can be appropriately adjusted according to the specific situation. It is necessary to ensure that most of the arm section is covered by the open resonant slot. The induced current in the third frequency band is mainly concentrated around the open resonant slot and reversed. The scattering field generated by the reverse induced current can be automatically Therefore, this measure can significantly reduce the radar cross-section in the third frequency band; rationally adjusting the size of the U-shaped bent thin metal wire and the open resonant slot can control the two scattering suppression frequency bands almost independently, so that the first frequency band The ability of the antenna to obtain dual frequency scatter suppression.

Fig. 4 is the design process of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristic in embodiment 1; Ant-L1 is a half-wave electric dipole antenna working in the first frequency band, and it comprises two equal lengths Vibrator arm; Ant-L2 can be obtained by dividing each vibrator arm of Ant-L1 into two shorter arm sections; a U-shaped bend thin metal wire is installed between adjacent arm sections of Ant-L2 , Ant-L3 can be obtained; at least one open resonant groove is etched on each arm section of Ant-L3, and finally Ant-L4 is obtained; The two dipole arms (201a and 201c) of the electromagnetic transparent antenna are composed; the miniaturization of the opening resonance slot can be realized by using the bending opening resonance slot, so that enough opening resonance slots can be etched on the arm section to moderately increase the opening resonance The number of slots can effectively extend the scatter suppression bandwidth.

Figure 5 shows the monostatic radar cross section (RCS: radar cross section) of half-wave electric dipole antennas (Ant-L1, Ant-L2, Ant-L3, Ant-L4) in the second and third frequency bands ); Ant-L1 has a larger radar cross-section in both the second frequency band and the third frequency band. Since the size of the Ant-L1 dipole arm is closer to the resonant electrical length of the antenna in the second frequency band, Ant-L1 has a larger radar cross-section in the second frequency band. Compared with Ant-L1, the radar cross section of Ant-L2 in the second frequency band is significantly reduced, but its radar cross section in the third frequency band The scattering cross-section is significantly increased, because the length of the divided arm section is shorter, and the length of the arm section is closer to the resonant electrical length of the third frequency band antenna; compared with Ant-L2, Ant-L3 is in the second The radar cross section in the frequency band is significantly reduced to less than ^850mm2 , and the installation of U-shaped bent thin metal wires between adjacent arm sections has little effect on the radar cross section of Ant-L3 in the third frequency band, so it has little effect on the Segmentation of the dipole arm of the first frequency band antenna and installation of bent thin metal wires between adjacent arm sections can reduce the radar cross section in the second frequency band, but cannot achieve reduction in the radar cross section in the third frequency band; Compared with Ant-L3, the radar cross section of Ant-L4 in the third frequency band is significantly reduced from about 10000mm ² to below 670mm ² ; in the second frequency band, Ant-L4 and Ant-L3 have almost the same radar cross section Therefore, etching an open resonant slot on the arm section of the antenna in the first frequency band can realize the reduction of the radar cross section in the third frequency band.

Figure 6 shows the S-parameter characteristics of the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics in Embodiment 1, its reflection coefficient in the first frequency band is less than -10dB, and its polarization isolation in the first frequency band Degree (isolation between two differently polarized ports) is less than -37dB.

Example 2

As shown in Figures 7 and 8, this embodiment provides a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics ("electromagnetic transparency" means that the radar cross-section of the antenna in a specific frequency band is very small, Thus the antenna is electromagnetically invisible to the antenna working in the specific frequency band), the antenna 102 includes a dielectric substrate 302, a reflector 502, baluns 402a, 402b and two pairs of orthogonal dipole arms, wherein 202a and 202c generates +45° polarized radiation for a pair of dipole arms, and 202b and 202d generate -45° polarized radiation for another pair of dipole arms. The dipole arms 202a-202d are designed on the dielectric substrate 302, the dielectric substrate 302 is fixed on the top of two orthogonal baluns 402a, 402b, the balun 402a is electrically connected with the dipole arms 202a, 202c, and the balun 402b is connected with the dipole arms 202b, 202d is electrically connected, and the two baluns 402a and 402b are vertically fixed on the reflector 502 .

As shown in FIG. 9 , it is a schematic structural diagram of the dipole arm 202a. The dipole arms 202b, 202c, and 202d have the same structure and size as the dipole arm 202a; the dipole arm 202a is divided into two shorter arm sections (602a and 602b) , a decoupling device consisting of 802a, 902a, and 902b is installed between two adjacent arm sections, wherein 902a and 902b are interdigital capacitors, and the gap between 902a and 902b is equivalent to a plate capacitor, U-shaped bending The thin metal wire 802a can be equivalent to an inductor, so 802a, 902a, and 902b together can be equivalent to a band-stop filter, which can suppress the induced current in the second frequency band from propagating between the arm sections, thereby significantly reducing the vibration of the first frequency band vibrator arm Radar scattering cross-section in the second frequency band; the arm sections 602a and 602b are respectively etched with open resonant slots 702a-702c and 702d-702f, and the number of open resonant slots can be properly adjusted according to specific conditions, and it is necessary to ensure that the arm sections Most of the area is covered by the open resonant slot, and the induced current in the third frequency band is mainly concentrated around the open resonant slot and reversed, and the scattered field generated by the reverse induced current can be self-cancelled, so this measure can be significantly realized in the third frequency band The radar cross section is reduced; the operating frequencies of the two scattering suppression frequency bands are almost independently adjustable, so that the first frequency band antenna can realize dual-frequency scattering suppression characteristics.

Example 3

As shown in Figures 10 and 11, this embodiment provides a dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics ("electromagnetic transparency" means that the radar cross-section of the antenna in a certain frequency band is very small, Thus the antenna is electromagnetically invisible to the antenna working in the specific frequency band), the antenna 103 includes a dielectric substrate 303, a reflector 503, baluns 403a, 403b and two pairs of orthogonal dipole arms, wherein 203a and 203c generates +45° polarized radiation for a pair of dipole arms, and 203b and 203d generate -45° polarized radiation for the other pair of dipole arms. The dipole arms 203a-203d are designed on the dielectric substrate 303, the dielectric substrate 303 is fixed on the top of two orthogonal baluns 403a, 403b, the balun 403a is electrically connected with the dipole arms 203a, 203c, and the balun 403b is connected with the dipole arms 203b, 203d is electrically connected, and the two baluns 403a and 403b are vertically fixed on the reflector 503 .

As shown in FIG. 12 , it is a schematic structural diagram of the vibrator arm 203a. The dipole arms 203b, 203c, 203d have the same structure and size as the dipole arm 203a; the dipole arm 203a is divided into two shorter arm sections (603a and 603b), Two adjacent arm sections are connected by a thin metal wire 803a bent multiple times, 803a and the arm section together form an LC parallel band-stop filter, which can prevent the induced current of the second frequency band from propagating between the arm sections, so the This measure can significantly reduce the radar cross-section in the second frequency band, and the number of arm sections can be adjusted appropriately according to specific conditions; the arm sections 603a and 603b are respectively etched with opening resonances 703a-703c and 703d-703f, and the openings The number of resonant slots can be adjusted appropriately according to the specific situation. It is necessary to ensure that most of the arm section is covered by the open resonant slot. The induced current in the third frequency band is mainly concentrated around the open resonant slot and reversed. The scattering caused by the reverse induced current The field can be self-cancelled, so this measure can significantly reduce the radar cross-section in the third frequency band; rationally adjusting the size of the bent thin metal wire and the open resonant slot can control the two scattering suppression frequency bands almost independently, so that the first The band antenna achieves the capability of dual-frequency scattering suppression.

Of course, in addition to the situation of the above three embodiments, the dual-polarized electromagnetic transparent antenna with dual-frequency scattering suppression characteristics of the present invention also has various forms, such as adopting ring (circular ring, square ring, polygonal ring) etc.) vibrator arm, change the shape of the open resonant slot, change the number of the open resonant slot, change the opening orientation of the open resonant slot, change the shape of the bent thin metal wire (such as a straight line structure), replace the bent thin metal wire with other decoupling devices Metal wires or open resonant slots, etc., will not be listed and described one by one here. In addition, the number of nested open resonant slots on different dipole arms may be the same or different, and the physical dimensions of different open resonant slots may be the same or different. In addition, in the above three embodiments, the vibrator arms are all printed on the dielectric substrate, of course, the vibrator arms may also exist in the form of metal castings.

The present invention aims to reduce the radar scattering cross section of the first frequency band dipole arm in the second frequency band by loading the dipole arm of the low frequency band antenna with a decoupling device (such as a bent or unbent thin metal wire), and at the same time through Loading a decoupling device on the arm section (such as etching an open resonant slot) reduces the radar scattering cross section of the dipole arm in the first frequency band in the third frequency band, thereby realizing dual-frequency scattering suppression.

The present invention also provides a method for the above-mentioned dual-polarized electromagnetic transparent antenna to realize dual-frequency scattering suppression, the main process of which is as follows:

First, by dividing the dipole arm into at least two arm sections, thereby reducing the radar cross section of the dipole arm in the second frequency band, and then installing decoupling devices (such as bending or no bending) between adjacent arm sections thin metal wire), while further reducing the radar scattering cross section of the dipole arm in the second frequency band, it helps to improve the impedance matching characteristics of the antenna. Finally, at least one open resonant slot is etched on each arm section, and the open resonant The number of slots should be as large as possible to cover the entire arm section as much as possible. Etching the open resonant slots can self-cancel the scattered field generated by the induced current in the third frequency band on the vibrator arm, thereby significantly reducing the vibration of the vibrator arm in the third frequency band. Finally, the antenna can achieve the reduction of the radar cross-section in the second frequency band and the third frequency band at the same time, so as to achieve the purpose of dual-frequency scattering suppression.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (6)

1. A dual-polarized electromagnetic transparent antenna, characterized in that: the antenna works in the first frequency band, but can simultaneously realize scattering suppression in the second frequency band and the third frequency band, and the frequency of the first frequency band is lower than that of the second frequency band Frequency band and the frequency corresponding to the third frequency band, the frequency of the second frequency band is lower than the frequency corresponding to the third frequency band; the antenna includes four dipole arms, a dielectric substrate, a first balun, a second balun and a reflector; The first balun and the second balun are crossed together to form a balun group, and are fixed vertically on the reflector, the dielectric substrate is fixed on the top of the balun group, and the four vibrator arms are designed on the dielectric substrate , forming a cross-shaped structure, and two dipole arms on the same straight line form a pair of dipole arm groups, and the four dipole arms form two pairs of dipole arm groups. The two pairs of dipole arm groups are used to generate radiation with different polarizations, so The first balun is electrically connected to the two oscillator arms of one pair of oscillator arm groups, and the second balun is electrically connected to the two oscillator arms of the other pair of oscillator arm groups; each oscillator arm is divided into at least two Two adjacent arm sections are connected by a decoupling device, the induced current working in the second frequency band is mainly distributed on the decoupling device, and the decoupling device is equivalent to an inductor, which is equivalent to the arm section It is a low-pass or band-stop filter, which can prevent the induced current of the second frequency band from propagating on the vibrator arm, thereby achieving scattering suppression in the second frequency band; each arm section is etched with at least one open resonant slot, distributed in the arm The induced current of the third frequency band on the section is mainly concentrated in the vicinity of the open resonant slot and is reversed, and the scattering field generated by the reverse induced current can be self-cancelled, so that scattering suppression can be realized in the third frequency band. The decoupling device is a fine Composition of metal wires or thin metal wires and two interdigitated capacitors, the two interdigitated capacitors are connected to both ends of the thin metal wires, the gap between the two interdigitated capacitors is equivalent to a plate capacitor, and the thin metal wires are straight lines , or U-shaped bent thin metal wire, or multi-bent thin metal wire after multiple bending treatment. 2. A kind of dual-polarized electromagnetic transparent antenna according to claim 1, characterized in that: the working frequency bands of the second frequency band and the third frequency band can be independently controlled by adjusting the size of the decoupling device and the opening resonance slot, thereby realizing Dual frequency scatter suppression. 3. The dual-polarized electromagnetic transparent antenna according to claim 1, wherein the dipole arm is a strip dipole arm or a ring dipole arm. 4. The dual-polarized electromagnetic transparent antenna according to claim 1, wherein the reflector is a metal reflector or a dielectric substrate covered with a metal material. 5 . The dual-polarized electromagnetic transparent antenna according to claim 1 , wherein the dipole arm is made of a metal casting or a printed circuit board. 6 . 6. The method for dual-polarized electromagnetic transparent antenna according to any one of claims 1 to 5 to achieve dual-frequency scattering suppression, characterized in that: first, by dividing the dipole arm into at least two arm sections, thereby reducing the dipole arm Radar cross section in the second frequency band, and then installing a decoupling device between adjacent arm sections, while further reducing the radar cross section of the dipole arm in the second frequency band, helps to improve the impedance matching characteristics of the antenna, and finally At least one open resonant slot is etched on each arm section. The number of open resonant slots should be as large as possible to cover the entire arm section. Etching the open resonant slot can enable the third frequency band induced current on the vibrator arm to generate The scattering field is self-cancelling, thereby significantly reducing the radar cross section of the dipole arm in the third frequency band, and finally enabling the antenna to simultaneously reduce the radar cross section in the second and third frequency bands, thereby achieving the purpose of dual-frequency scattering suppression .

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