CN111969325A - Frequency selection surface unit based on filter antenna and frequency selection surface - Google Patents
Frequency selection surface unit based on filter antenna and frequency selection surface Download PDFInfo
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- CN111969325A CN111969325A CN202010581672.1A CN202010581672A CN111969325A CN 111969325 A CN111969325 A CN 111969325A CN 202010581672 A CN202010581672 A CN 202010581672A CN 111969325 A CN111969325 A CN 111969325A
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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
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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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
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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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Abstract
The invention discloses a frequency selection surface unit based on a filter antenna, which comprises a first filter antenna, a second filter antenna, a metal column and a floor, wherein the first filter antenna is connected with the metal column; one end of the metal column is arranged on the first filtering antenna, the other end of the metal column is arranged on the second filtering antenna, and the metal column penetrates through a third opening formed in the floor, so that the first filtering antenna, the floor and the second filtering antenna are sequentially arranged on the metal column; the first filter antenna, the second filter antenna and the floor are provided with corresponding grooves, the radiation zero point of the filter antenna and/or the feed circuit of the post-filter antenna are used for generating the out-of-band transmission zero point of the frequency selection surface, so that the selectivity and the overall performance of the frequency selection surface are improved, and the problems that the overall section of the frequency selection surface is enlarged, the structure is complex, the processing difficulty is high and the like when the transmission zero point of the frequency selection surface is generated by increasing a coupling path, a resonator and the like in the prior art are solved. The invention also discloses a frequency selection surface based on the filter antenna.
Description
Technical Field
The present invention relates to frequency selective surfaces, and more particularly to frequency selective surfaces and frequency selective surfaces based on filter antennas.
Background
The frequency selective surface is a periodic structure with filtering performance, and has unique polarization selective characteristics, such as conversion of linear polarization incident waves into circular polarization waves, conversion of horizontal polarization incident waves into vertical polarization waves and the like. Frequency selective surfaces have been widely used in radome, reflector, polarization sensor, microwave sensor, spatial filter, etc. based on their unique characteristics. In practical applications, the frequency selective surface is generally required to have the characteristics of high selectivity and low profile. Conventional frequency selective surfaces, which are typically two-dimensional periodic arrays of patches and grooves printed on a dielectric substrate, constitute only low order filter responses and have poor filter response characteristics. When the filter response characteristics of the frequency selective surface are poor, the frequency selective surface becomes very sensitive to the variation of the incident angle and the out-of-band selectivity is not ideal. With the development of science and technology, many frequency selective surfaces with three-dimensional structures and excellent filter response exist today, but the frequency selective surfaces are difficult to apply to practical occasions.
The criteria for determining the overall performance of the frequency selective surface include three criteria: angle of incidence stability, out-of-band selectivity, out-of-band rejection capability, and structural profile thickness. Nowadays, it is an important research direction to improve the overall performance of the frequency selective surface for the stability of the incident angle and the out-of-band selectivity. For out-of-band selectivity, the selectivity of the frequency selective surface is generally improved by an out-of-band transmission zero mode or a side-band steep-drop characteristic, so that the overall performance of the frequency selective surface is improved. Abbaspour et al, for example, in 2004 proposed the concept of antenna-filter-antenna design in the field of frequency selective surfaces, which are constructed with out-of-band nulls using the ground as a filter. Li et al proposed a high-order frequency selective surface of a multilayer structure in 2012, and a third-order frequency selective surface having two transmission zeros was generated by mutual coupling between resonators, thereby achieving high selectivity of the structure. In 2014, b.li et al constructed the frequency selective surface of the multimode resonator by using a three-dimensional structure, and the multi-coupling path enables the three-dimensional frequency selective surface to obtain a steep filter response and a harmonic suppression capability. In 2015, d.s.wang et al proposed a frequency selective surface of an aperture-coupled resonator, which utilizes a common aperture to realize electric coupling and magnetic coupling paths between resonators to generate out-of-band transmission zeros to improve out-of-band selectivity. From the above, the frequency selective surface in the prior art improves the overall performance of the frequency selective surface in terms of the stability of the incident angle and the out-of-band selectivity, but the thickness of the cross-sectional structure of the frequency selective surface is thicker in the design process, which results in the problems of complex structure, high processing difficulty and the like of the frequency selective surface.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a frequency selective surface unit based on a filtering antenna, which can solve the problems of thick cross-section, complex structure, and difficult processing of the frequency selective surface in the prior art.
The second objective of the present invention is to provide a frequency selective surface based on a filter antenna, which can solve the problems of the prior art, such as thick cross-section, complex structure and difficult processing of the frequency selective surface.
One of the purposes of the invention is realized by adopting the following technical scheme:
a frequency selective surface unit based on a filter antenna, the frequency selective surface unit comprising a first filter antenna, a second filter antenna, a metal post and a floor; the first filtering antenna comprises a first antenna board and a first groove arranged on the first antenna board, the second filtering antenna comprises a second antenna board and a second groove arranged on the second antenna board, and a third opening and a third groove are formed in the floor; the first filtering antenna is a receiving antenna of the frequency selection surface unit, and one end of the metal column is fixed on a first antenna board of the first filtering antenna; the second filter antenna is a radiation antenna of the frequency selection surface unit, and the other end of the metal column is fixed on a second antenna board of the second filter antenna; the metal column penetrates through a third opening on the floor, so that the floor is located between the first antenna board and the second antenna board;
when the frequency of the electromagnetic wave is in the pass band of the frequency selective surface unit, the electromagnetic wave is received by the receiving antenna and transmitted to the radiating antenna through the metal column to be radiated; when the frequency of the electromagnetic wave is outside the pass band of the frequency selective surface unit, the electromagnetic wave is totally reflected by the frequency selective surface unit; the first filtering antenna and the second filtering antenna are symmetrically or asymmetrically arranged;
when the first filtering antenna and the second filtering antenna are symmetrically arranged, a first out-of-band transmission zero point of the frequency selection surface unit is generated through radiation zero points of the first filtering antenna and the second filtering antenna, and a second out-of-band transmission zero point of the frequency selection surface unit is generated through a third groove of the floor;
when the first filtering antenna and the second filtering antenna are asymmetrically arranged, a first out-of-band transmission zero of the frequency selective surface unit is generated through a radiation zero of the first filtering antenna, and a second out-of-band transmission zero of the frequency selective surface unit is generated through a radiation zero of the second filtering antenna.
Furthermore, a first opening is formed in the first antenna board, and one end of the metal column is installed in the first opening, so that the metal column is fixedly connected with the first antenna board; the second antenna plate is provided with a second opening, and the other end of the metal column is installed in the second opening, so that the metal column is fixedly connected with the second antenna plate.
Furthermore, when the first filtering antenna and the second filtering antenna are symmetrically arranged, the first antenna board and the second antenna board are symmetrically arranged at two ends of the metal column through the floor; the first groove and the second groove are the same in formation and size.
Further, the first groove and the second groove comprise two grooves; the first grooves are respectively arranged at two sides of the first opening and are symmetrically arranged by the first opening; the second grooves are respectively arranged at two sides of the second opening and are symmetrically arranged with the second opening.
Further, the first groove and the second groove are both linear grooves; one end of the first groove is arranged on the top edge of the first antenna board, and one end of the second groove is arranged on the top edge of the second antenna board; the length of the first groove is smaller than the height of the first antenna board, and the length of the second groove is smaller than the height of the second antenna board; the third groove is an unsealed square groove, and the opening direction of the square groove faces the third opening.
Further, when the first filtering antenna and the second filtering antenna are arranged asymmetrically: the first recess is shaped and/or sized differently than the second recess.
Furthermore, the first grooves comprise two grooves which are respectively arranged at two sides of the first opening and are symmetrically arranged by the first opening; the second grooves comprise two grooves which are respectively arranged at two sides of the second opening and are symmetrically arranged with the second opening.
Further, the first groove is an L-shaped groove; the second groove is an L-shaped groove, and the first groove and the second groove respectively comprise a first line section groove and a second line section groove; the lengths of the first line section groove of the first groove and the first line section groove of the second groove are different, and/or the lengths of the second line section groove of the first groove and the second line section groove of the second groove are different;
one end of a first line section groove of the first groove is arranged on the top edge of the first antenna board, and the other end of the first line section groove is communicated with one end of a second line section groove of the first groove; the extending direction of the other end of the second line section groove of the first groove is opposite to the direction of the first opening;
one end of a first line segment groove of the second groove is arranged on the top edge of the second antenna board, and the other end of the first line segment groove is communicated with one end of a second line segment groove of the second groove; the extending direction of the other end of the second line section groove of the second groove is opposite to the direction of the second opening; the third groove is a circular groove, and the circle center of the third groove and the circle center of the third open hole are on the same horizontal line.
Furthermore, the first filtering antenna, the second filtering antenna and the floor are fixedly connected through a filling medium.
The second purpose of the invention is realized by adopting the following technical scheme:
a filter antenna based frequency selective surface consisting of a plurality of filter antenna based frequency selective surface element arrays as employed in one of the objects of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the filter antenna is applied to the frequency selection surface, and the corresponding groove is arranged on the antenna plate of the filter antenna, so that the out-of-band transmission zero point of the frequency selection surface is generated by utilizing the radiation zero point of the filter antenna and the band-stop characteristic of the feed circuit, and the passband frequency band of the frequency selection surface is determined; meanwhile, through different arrangements of the structure of the filtering antenna, the selectivity of the frequency selection surface can be greatly improved, and the overall performance of the frequency selection surface is improved. The filter antenna is provided with the groove, so that the structure is simple, the processing technology is simple, and the problems that the section thickness of the frequency selection surface is thick, the structure is complex, the processing difficulty is large and the like caused by the fact that the transmission zero point is realized through a resonator or a coupling path and the like when the overall performance of the frequency selection surface is improved in the prior art are solved.
Drawings
FIG. 1 is a schematic structural diagram of a frequency selective surface provided by the present invention;
FIG. 2 is a schematic structural diagram of a symmetrical frequency selective surface unit according to the present invention;
FIG. 3 is a schematic view of the internal structure of FIG. 2;
fig. 4 is a schematic structural diagram of the first antenna board in fig. 2;
FIG. 5 is a schematic structural view of the floorboard shown in FIG. 2;
FIG. 6 is an electromagnetic wave simulation diagram of the filter response of FIG. 2;
FIG. 7 is a schematic structural diagram of an asymmetric frequency selective surface element provided by the present invention;
FIG. 8 is a schematic view of the internal structure of FIG. 7;
fig. 9 is a schematic structural diagram of the first antenna board in fig. 7;
fig. 10 is a schematic structural diagram of the second antenna board in fig. 7;
FIG. 11 is a schematic structural view of the floorboard shown in FIG. 7;
fig. 12 is an electromagnetic wave simulation diagram of the filter response of fig. 7.
In the figure: 1. a frequency selective surface; 2. a frequency selective surface unit; 3. a first antenna board; 31. a first opening; 32. a first groove; 33. a fourth opening; 34. a fourth groove; 4. a second antenna plate; 43. fifth opening; 44. a fifth groove; 5. a floor; 51. a third opening; 52. a third groove; 53. a sixth opening; 54. a sixth groove; 6. filling a medium; 7. a metal pillar.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention provides a frequency selective surface based on a filter antenna, which is a band-pass type frequency selective surface. The band-pass frequency selective surface is an infinite surrounding structure having selectivity for the frequency of an electromagnetic wave, and allows the electromagnetic wave of a certain frequency band to pass through the frequency selective surface and reflect the electromagnetic wave of other frequency bands. That is, when the frequency of the electromagnetic wave is within the pass band frequency band of the frequency selective surface, the electromagnetic wave is radiated through the frequency selective surface; when the frequency of the electromagnetic wave is outside the passband frequency band of the frequency selective surface, the electromagnetic wave is totally reflected by the frequency selective surface.
Preferably, according to the principle of generating the radiation zero point of the filter antenna, the invention provides the following two schemes: one is that the radiation zero point generated by the structure of the filter antenna is utilized to make the filter antenna not work under specific frequency, and then the out-of-band transmission zero point of the frequency selection surface is generated; one is to realize the filter characteristic by using the feed circuit structure of the filtering antenna, and the resulting radiation zero generates an out-of-band transmission zero of the frequency selective surface. That is, the present invention improves the overall performance of the frequency selective surface by creating out-of-band transmission zeros. Here, the transmission zero is a characteristic belonging to the out-of-band, and in colloquial terms, refers to the frequency of electromagnetic waves when the energy transmitted in the past is zero, and the present invention is hereinafter referred to as out-of-band transmission zero. In addition, the invention also relates to the following concepts: the pass band refers to a frequency range of the electromagnetic wave allowed to pass by the frequency selective surface, and the stop band refers to a frequency range of the electromagnetic wave not allowed to pass.
According to the invention, the filter antenna is applied to the structure of the frequency selection surface, and the out-of-band transmission zero point of the frequency selection surface is generated through the radiation zero point of the filter antenna, so that the passband frequency band of the frequency selection surface is determined, and the overall performance of the frequency selection surface is improved. Meanwhile, the structure of the filter antenna is changed, so that the position of a transmission zero point is changed, the adjustment of a passband frequency band of the frequency selection surface is realized, the selectivity of the frequency selection surface is improved, and the high selectivity of the frequency selection surface is realized. Wherein, the selectivity of the frequency selective surface refers to the attenuation speed from the pass band to the stop band. The faster the decay rate of the pass band to the stop band indicates the higher the selectivity of the frequency selective surface. High selectivity refers to rapid attenuation from the passband to the stopband. The selectivity of the frequency selective surface is generally improved by improving the sideband dip characteristic and by creating an out-of-band transmission zero. The invention improves the selectivity of the frequency selection surface based on the mode of generating the out-of-band transmission zero point, and realizes the high selectivity of the frequency selection surface.
Generally, the frequency selective surface includes two out-of-band transmission zeros. The out-of-band transmission zero is a frequency interval point between a pass band and a stop band of the frequency selective surface, and the frequency band range of one pass band can be determined through the two out-of-band transmission zeros. As shown in fig. 1, the frequency selective surface 1 is composed of an array of a plurality of frequency selective surface elements 2, which are periodic structural elements.
Wherein each frequency selective surface element 2 of the frequency selective surface 1 is identical. The invention thus illustrates the structure of the frequency selective surface 1 in the structure of a single frequency selective surface element 2.
In general, the frequency selective surface 1 can be seen as a metal panel with frequency selectivity. The metal panel allows the electromagnetic wave within the preset frequency band to penetrate through and does not allow the electromagnetic wave outside the preset frequency band to penetrate through. That is, when the frequency of the electromagnetic wave is within the pass band, the electromagnetic wave passes through the frequency selective surface 1; when the frequency of the battery wave is outside the pass band, the electromagnetic wave is reflected by the frequency selective surface 1. Wherein the pass band referred to herein refers to the frequency range of the electromagnetic waves that the frequency selective surface 1 allows to pass.
Preferably, the present invention gives the following two configurations of the frequency selective surface unit 2 based on the difference in the manner of generation of the out-of-band transmission zero.
Example one
The invention provides an embodiment I, a frequency selection surface unit based on a filter antenna, which is also called a symmetrical frequency selection surface unit, and utilizes a radiation zero point generated by the structure of the filter antenna, so that the filter antenna does not work under a specific frequency, the filter characteristic is realized, and an out-of-band transmission zero point of the frequency selection surface is generated. The frequency selective surface is composed of a plurality of frequency selective surface unit arrays, and therefore, the out-of-band transmission zero of the frequency selective surface is also the out-of-band transmission zero of the frequency selective surface unit.
As shown in fig. 2 to 6, the frequency selective surface unit based on the filtering antenna provided in this embodiment includes a first filtering antenna, a second filtering antenna, a floor 5 and a metal post 7.
The first filtering antenna and the second filtering antenna are identical in structure, and are symmetrically arranged.
Specifically, one end of the metal column 7 is installed on the first filter antenna, the other end is installed on the second filter antenna, and the floor 5 is arranged between the first filter antenna and the second filter antenna.
Preferably, the floor panel 5 is provided with a third opening 51. The metal column 7 passes through the third opening 51, so that the first filtering antenna, the floor 5 and the second filtering antenna are sequentially disposed on the metal column 7, and the first filtering antenna and the second filtering antenna are symmetrically disposed at two ends of the metal column 7 by the floor 5.
The metal pillar 7 in this embodiment is a conductor, and is used for transmitting the electromagnetic wave received by the first filtering antenna, and transmitting the electromagnetic wave to the second filtering antenna and radiating the electromagnetic wave. The first filtering antenna is used as a receiving antenna of the frequency selection surface, and the second filtering antenna is used as a radiating antenna of the frequency selection surface. When the electromagnetic wave is projected to the frequency selective surface, the first filter antenna receives the electromagnetic wave and transmits the electromagnetic wave to the second filter antenna through the metal column 7, and then the electromagnetic wave is radiated through the second filter antenna.
Because the frequency selective surface provided by the invention is a band-pass type frequency selective surface, only when the frequency of the electromagnetic wave is in a pass band, the electromagnetic wave can be transmitted to the metal column 7 through the first filtering antenna and radiated out through the second filtering antenna. Conversely, when the frequency of the electromagnetic wave is outside the pass band, it is totally reflected by the frequency selective surface.
Preferably, the first filter antenna comprises a first antenna board 3 and a first recess 32 provided on the first antenna board 3. The second filter antenna comprises a second antenna plate 4 and a second recess provided on the second antenna plate 4.
Since the first filtering antenna and the second filtering antenna in this embodiment have the same structure and are symmetrically disposed at two ends of the metal pillar 7 by the floor 5, the first groove 32 and the second groove have the same structure. That is, the first grooves 32 are identical in number, shape and size to the second grooves.
Preferably, the first antenna board 3 is provided with a first opening 31 and the second antenna board 4 is provided with a second opening. One end of the metal pillar 7 is fitted into the first opening 31 so that the metal pillar 7 is fixed to the first antenna board 3. The other end of the metal post 7 is mounted in the second opening, so that the metal post 7 is fixed to the second antenna plate 4.
Preferably, the floor panel 5 is also provided with a third groove 52.
In the present embodiment, one out-of-band transmission zero of the frequency selective surface is generated by the corresponding grooves of the first and second filter antennas, and the other out-of-band transmission zero of the frequency selective surface is generated by the third groove 52 on the floor 5 located between the first and second filter antennas. That is, since the filter antenna itself can also receive the electromagnetic wave, the filter antenna itself can also radiate the electromagnetic wave, and thus, the corresponding groove is added to the structure of the filter antenna, so that the filter antenna can realize a radiation zero point at a certain frequency point, and the filter antenna does not radiate, so that the electromagnetic wave cannot be radiated out through the filter antenna of the frequency selective surface unit, that is, an out-of-band transmission zero point of the frequency selective surface is generated. The invention realizes the generation of the out-of-band transmission zero point of the frequency selection surface by using the filter antenna, and solves the problems of thicker section, complex structure, large processing difficulty and the like of the frequency selection surface when realizing the out-of-band transmission zero point by adopting a resonator or a coupling caliber and the like in the prior art. As shown in fig. 6, an electromagnetic wave simulation diagram showing the frequency response of the symmetric frequency selective surface is shown. The electromagnetic wave simulation chart of the frequency response shows the selectivity of the frequency selective surface to the frequency, and the selectivity is generally judged by a reflection coefficient and a transmission coefficient.
Generally, when the reflection coefficient is less than-10 dB, it indicates that the electromagnetic wave corresponding to the current frequency is a transmitted wave, i.e., the current frequency is in the pass band of the frequency selective surface. On the contrary, when the reflection coefficient is larger than-10 dB, the electromagnetic wave corresponding to the current frequency is a reflected wave, that is, the current frequency is not in the pass band of the frequency selective surface.
Wherein the transmission coefficient and the reflection coefficient are in an inverse relationship, and the sum of squares of the amplitude values of the transmission coefficient and the reflection coefficient is 1, which is in an inverse relationship in terms of value. The amplitude values are not dB values in fig. 6, wherein the dB values and the amplitude values can be converted into each other, the conversion process is common knowledge of those skilled in the art, and the present invention is not specifically described.
As can be seen from fig. 6, two out-of-band transmission zeros of the symmetric frequency selective surface provided in this embodiment can be obtained according to the graphs of the reflection coefficient and the transmission coefficient, so as to determine the band range of the pass band of the frequency selective surface.
The symmetrical frequency selective surface unit provided by this embodiment is configured with corresponding grooves on the first filtering antenna, the second filtering antenna and the floor 5, so that the structural characteristics of the first filtering antenna, the second filtering antenna and the floor 5 generate an out-of-band transmission zero point of the frequency selective surface, thereby improving the selectivity and the overall performance of the frequency selective surface.
Preferably, the shape and size of the first filtering antenna, the second filtering antenna and the corresponding groove on the floor 5 are not limited in any way, as long as the first filtering antenna and the second filtering antenna are symmetrically arranged.
Preferably, the first groove 32 and the second groove each include two. The first grooves 32 are respectively disposed at two sides of the first opening 31 and are symmetrically disposed with respect to the first opening 31. The second grooves are respectively arranged at two sides of the second opening and are symmetrically arranged with the second opening.
Specifically, this embodiment provides an embodiment to explain the structure and the like of the first groove 32, the second groove, and the third groove 52. As shown in fig. 2 to 5, the first groove 32 is a straight groove, and one end of the first groove 32 is disposed on the top side of the first antenna board 3, and the length of the first groove 32 is smaller than the height of the first antenna board 3.
Since the first groove 32 and the second groove have the same structure and size, the second groove is also a straight groove, and one end of the second groove is disposed on the top edge of the second antenna board 4, and the length of the second groove is smaller than the height of the second antenna board 4.
Preferably, the third groove 52 is a square groove that is not closed, and the third groove 52 is provided below the floor panel 5, with the opening direction of the third groove 52 facing the third opening 51.
In the embodiment, the out-of-band transmission zero point is realized by the first filtering antenna, the second filtering antenna and the grooves arranged on the floor 5, so that the position of the transmission zero point can be controlled by changing the shapes and/or sizes of the first filtering antenna, the second filtering antenna and the grooves on the floor 5, the selectivity of the frequency selection surface is greatly improved, and the high selectivity of the frequency selection surface is realized.
Preferably, a filling medium 6 is provided between the first antenna board 3, the second antenna board 4 and the floor 5, so that the first antenna board 3, the second antenna board 4, the floor 5 and the metal pillar 7 are fixed to form a frequency selective surface unit.
The invention utilizes the radiation zero point of the filter antenna to generate the transmission zero point, and because the structure of the filter antenna is simple and the thickness is thinner, compared with the traditional structure which adopts a plurality of coupling paths to generate cross coupling between resonators to generate the transmission zero point, the thickness of the frequency selection surface can be thinner, the section thickness of the frequency selection surface is greatly reduced, the frequency selection surface has a lower section, and the application scene of the frequency selection surface is wider.
Example two
The invention provides an embodiment II, and the frequency selective surface unit is based on a filter antenna and has an asymmetric frequency selective surface unit.
The present embodiment is different from the first embodiment in that: the first filtering antenna and the second filtering antenna are arranged asymmetrically.
Specifically, as shown in fig. 7 to 12, the asymmetric frequency selective surface includes a first filter antenna, a second filter antenna, a floor 5, and a metal post 7.
One end of the metal column 7 is installed on the first filtering antenna, the other end of the metal column 7 is installed on the second filtering antenna, and the floor 5 is arranged between the first filtering antenna and the second filtering antenna.
Preferably, the floor 5 is provided with a sixth opening 53. The metal post 7 passes through the sixth opening 53, so that the first filter antenna, the floor 5 and the second filter antenna are sequentially arranged on the metal post 7. The first filtering antenna is used as a receiving antenna of the frequency selection surface, and the second filtering antenna is used as a radiating antenna of the frequency selection surface.
Similarly, the first filter antenna comprises a first antenna plate 3 and a fourth recess 34 provided on the first antenna plate 3. The second filter antenna comprises a second antenna plate 4 and a fifth recess 44 provided in the second antenna plate 4. In order to distinguish the grooves on the first antenna board 3 and the second antenna board 4 of the present embodiment from the corresponding grooves of the first embodiment, the present embodiment designates the groove on the first antenna board 3 as the fourth groove 34 and the groove on the second antenna board 4 as the fifth groove 44. The other names are the same.
Preferably, since the first filter antenna and the second filter antenna in the asymmetric frequency selective surface unit of the present embodiment are asymmetrically disposed, the fourth groove 34 and the fifth groove 44 in the present embodiment have different structures, that is: the fourth groove 34 is shaped and/or sized differently than the fifth groove 44.
In the embodiment, the fourth groove 34 of the first filtering antenna is used for generating the radiation zero point of the first filtering antenna, so as to generate an out-of-band transmission zero point of the frequency selection surface; the use of the fifth notch 44 of the second filter antenna to create a radiation null of the second filter antenna creates another out-of-band transmission null of the frequency selective surface.
The present embodiment also improves the selectivity of the frequency selective surface by controlling the position of the out-of-band transmission zero by changing the shape or size of the fourth notch 34 of the first filter antenna, the fifth notch 44 of the second filter antenna, and the like.
In the same manner as the first embodiment, the first antenna board 3 is provided with a fourth opening 33, and the second antenna board 4 is provided with a fifth opening 43. One end of the metal pillar 7 is fitted into the fourth opening 33 so that the metal pillar 7 is fixed with the first antenna board 3. The other end of the metal post 7 is fitted into the fifth opening 43, so that the metal post 7 is fixed to the second antenna plate 4.
Likewise, the floor 5 is also provided with a sixth groove 54. The present embodiment does not set any limit to the structure of the fourth groove 34, the fifth groove 44, and the sixth groove 54.
Preferably, the fourth groove 34 and the fifth groove 44 each include two. The fourth grooves 34 are respectively disposed at two sides of the fourth opening 33 and are symmetrically disposed with respect to the fourth opening 33. The fifth grooves 44 are respectively disposed at two sides of the fifth opening 43 and are symmetrically disposed with respect to the fifth opening 43.
Specifically, this embodiment provides an embodiment to explain the structures of the fourth groove 34, the fifth groove 44, and the sixth groove 54. As shown in fig. 7-10, the fourth groove 34 in this embodiment is an L-shaped groove. The fourth groove 34 and the fifth groove 44 each include a first line segment groove and a second line segment groove, and the first line segment groove is perpendicular to the second line segment groove. The one end of the first line segment recess of fourth recess 34 is located the topside of first antenna board 3, and the one end of the other end and the second line segment recess becomes 90 degrees angles, and the extending direction of the other end of second line segment recess is the opposite direction of fourth aperture 33.
Likewise, the fifth groove 44 is an L-shaped groove. One end of the first line segment groove of the fifth groove 44 is disposed on the top side of the second antenna board 4, and the other end of the first line segment groove forms an angle of 90 degrees with one end of the second line segment groove, and the extending direction of the other end of the second line segment groove is the opposite direction of the fifth opening 43.
The first segment groove of the fourth groove 34 is of a different length than the first segment groove of the fifth groove 44.
The second segment groove of the fourth groove 34 is different in length from the second segment groove of the fifth groove 44.
Preferably, as shown in fig. 11, the sixth groove 54 is a circular groove, and the center of the sixth groove 54 is the same as the center of the sixth opening 53.
Similarly, as shown in fig. 7, a filling medium 6 is provided between the first antenna board 3, the second antenna board 4 and the floor 5, so that the first antenna board 3, the second antenna board 4, the floor 5 and the metal pillar 7 are fixed to form the asymmetric frequency selective surface unit.
The asymmetric frequency selective surface element provided in this embodiment generates one out-of-band transmission zero of the frequency selective surface by the radiation zero of the first filtering antenna, and generates the other out-of-band transmission zero of the frequency selective surface by the radiation zero of the second filtering antenna. The change of the position of the transmission zero point is controlled by changing the shape or the size of the grooves on the first filtering antenna and the second filtering antenna, so that the selectivity of the frequency selection surface and the overall performance of the frequency selection surface are greatly improved, and the high selectivity of the frequency selection surface is realized. As shown in fig. 12, the present invention presents an electromagnetic simulation of the frequency response of an asymmetric frequency selective surface. As can be seen from fig. 12, the present embodiment provides a passband frequency range of the asymmetric frequency selective surface unit.
Similarly, the shapes and lengths of the fourth groove 34, the fifth groove 44, and the sixth groove 54 in the asymmetric frequency selective surface unit provided in this embodiment are not limited, and may be set according to actual requirements and manufacturing processes.
EXAMPLE III
Preferably, the present invention further provides a frequency selective surface, which comprises a plurality of frequency selective surface element arrays based on the filtering antenna provided in the first embodiment, or comprises a plurality of frequency selective surface element arrays based on the filtering antenna provided in the second embodiment.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A frequency selective surface unit based on a filter antenna, wherein the frequency selective surface unit comprises a first filter antenna, a second filter antenna, a metal post and a floor; the first filtering antenna comprises a first antenna board and a first groove arranged on the first antenna board, the second filtering antenna comprises a second antenna board and a second groove arranged on the second antenna board, and a third opening and a third groove are formed in the floor; the first filtering antenna is a receiving antenna of the frequency selection surface unit, and one end of the metal column is fixed on a first antenna board of the first filtering antenna; the second filter antenna is a radiation antenna of the frequency selection surface unit, and the other end of the metal column is fixed on a second antenna board of the second filter antenna; the metal column penetrates through a third opening on the floor, so that the floor is located between the first antenna board and the second antenna board;
when the frequency of the electromagnetic wave is in the pass band of the frequency selective surface unit, the electromagnetic wave is received by the receiving antenna and transmitted to the radiating antenna through the metal column to be radiated; when the frequency of the electromagnetic wave is outside the pass band of the frequency selective surface unit, the electromagnetic wave is totally reflected by the frequency selective surface unit; the first filtering antenna and the second filtering antenna are symmetrically or asymmetrically arranged;
when the first filtering antenna and the second filtering antenna are symmetrically arranged, a first out-of-band transmission zero point of the frequency selection surface unit is generated through radiation zero points of the first filtering antenna and the second filtering antenna, and a second out-of-band transmission zero point of the frequency selection surface unit is generated through a third groove of the floor;
when the first filtering antenna and the second filtering antenna are asymmetrically arranged, a first out-of-band transmission zero of the frequency selective surface unit is generated through a radiation zero of the first filtering antenna, and a second out-of-band transmission zero of the frequency selective surface unit is generated through a radiation zero of the second filtering antenna.
2. The filtering antenna based frequency selective surface unit according to claim 1, wherein the first antenna board is provided with a first opening, and one end of the metal pillar is installed in the first opening, so that the metal pillar is fixedly connected with the first antenna board; the second antenna plate is provided with a second opening, and the other end of the metal column is installed in the second opening, so that the metal column is fixedly connected with the second antenna plate.
3. The filtering antenna based frequency selective surface unit according to claim 2, wherein when the first filtering antenna and the second filtering antenna are symmetrically disposed, the first antenna board and the second antenna board are symmetrically disposed on both ends of the metal pillar in a floor; the first groove and the second groove are the same in formation and size.
4. The filtering antenna based frequency selective surface unit of claim 3, wherein the first notch and the second notch each comprise two notches; the first grooves are respectively arranged at two sides of the first opening and are symmetrically arranged by the first opening; the second grooves are respectively arranged at two sides of the second opening and are symmetrically arranged with the second opening.
5. The filter antenna based frequency selective surface unit of claim 4, wherein the first and second grooves are both linear grooves; one end of the first groove is arranged on the top edge of the first antenna board, and one end of the second groove is arranged on the top edge of the second antenna board; the length of the first groove is smaller than the height of the first antenna board, and the length of the second groove is smaller than the height of the second antenna board; the third groove is an unsealed square groove, and the opening direction of the square groove faces the third opening.
6. The filter antenna based frequency selective surface unit of claim 2, wherein when the first filter antenna and the second filter antenna are disposed asymmetrically: the first recess is shaped and/or sized differently than the second recess.
7. The filtering antenna-based frequency selective surface unit according to claim 6, wherein the first grooves comprise two grooves, which are respectively disposed at two sides of the first opening and symmetrically disposed with respect to the first opening; the second grooves comprise two grooves which are respectively arranged at two sides of the second opening and are symmetrically arranged with the second opening.
8. The filtering antenna based frequency selective surface unit of claim 7, wherein the first notch is an L-shaped notch; the second groove is an L-shaped groove, and the first groove and the second groove respectively comprise a first line section groove and a second line section groove; the lengths of the first line section groove of the first groove and the first line section groove of the second groove are different, and/or the lengths of the second line section groove of the first groove and the second line section groove of the second groove are different;
one end of a first line section groove of the first groove is arranged on the top edge of the first antenna board, and the other end of the first line section groove is communicated with one end of a second line section groove of the first groove; the extending direction of the other end of the second line section groove of the first groove is opposite to the direction of the first opening;
one end of a first line segment groove of the second groove is arranged on the top edge of the second antenna board, and the other end of the first line segment groove is communicated with one end of a second line segment groove of the second groove; the extending direction of the other end of the second line section groove of the second groove is opposite to the direction of the second opening; the third groove is a circular groove, and the circle center of the third groove and the circle center of the third open hole are on the same horizontal line.
9. The filter antenna based frequency selective surface unit of claim 1, wherein the first filter antenna, the second filter antenna and the floor are fixedly connected through a filling medium.
10. A filter antenna based frequency selective surface, characterized in that the frequency selective surface is composed of a plurality of filter antenna based frequency selective surface element arrays according to any of claims 1-9.
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| WO2023138434A1 (en) * | 2022-01-24 | 2023-07-27 | 华为技术有限公司 | Filtering device, base station antenna and base station apparatus |
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