CN114899614A - Metamaterial dual-frequency filtering antenna - Google Patents
Metamaterial dual-frequency filtering antenna Download PDFInfo
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- CN114899614A CN114899614A CN202210513531.5A CN202210513531A CN114899614A CN 114899614 A CN114899614 A CN 114899614A CN 202210513531 A CN202210513531 A CN 202210513531A CN 114899614 A CN114899614 A CN 114899614A
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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
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a metamaterial dual-frequency filtering antenna and relates to the field of filtering antennas. The metamaterial-based coaxial feed structure comprises a metal cavity, wherein a metamaterial filtering resonance structure is arranged inside the metal cavity, a coaxial feed structure is arranged at one end of the metal cavity, and an opening is formed in the other end of the metal cavity; the metamaterial filtering resonance structure is connected with the coaxial feed structure through a double-frequency matching structure with a double-resonance mode; an output probe is arranged at one end of the metamaterial filtering resonance structure, which is far away from the coaxial feed structure, and the output probe is positioned at the opening; and an antenna radiation opening surface is arranged at one end of the metal cavity far away from the coaxial feed structure. Through from coaxial feed structure, dual-frenquency matching structure, metamaterial filtering resonance structure and output probe and antenna radiation mouthful face under mutually supporting, realize electromagnetic signal's dual-frenquency output, whole antenna adopts metamaterial self characteristic to realize filtering function, has avoided the introduction of wave filter to the size of antenna has effectively been reduced.
Description
Technical Field
The invention relates to the field of filtering antennas, in particular to a metamaterial dual-frequency filtering antenna.
Background
In the field of microwave/5G communication and the like, with the rapid development of wireless communication technology and the progress of new materials, people put forward higher requirements on communication equipment. For an antenna in a communication device, on one hand, a dual-band/multi-band technique needs to be used to extend the operating bandwidth of the antenna, and on the other hand, a filter needs to be used to suppress signals outside the operating band. Therefore, the antenna which simultaneously realizes filtering and double-frequency operation has high application value. In the prior art, a filter is usually added to enable the antenna to realize dual-frequency output and have filtering performance, but such a method increases the size of the antenna. And the scheme of the antenna and the electromagnetic band gap structure is adopted, so that only a single-frequency filtering antenna can be realized.
Disclosure of Invention
In view of the above disadvantages in the prior art, the present invention provides a small metamaterial dual-band filter antenna capable of achieving dual-band output.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the metamaterial dual-frequency filtering antenna comprises a metal cavity, wherein a metamaterial filtering resonance structure is arranged in the metal cavity, a coaxial feed structure is arranged at one end of the metal cavity, and an opening is formed in the other end of the metal cavity; the metamaterial filtering resonance structure is connected with the coaxial feed structure through a double-frequency matching structure with a double-resonance mode; an output probe is arranged at one end of the metamaterial filtering resonance structure, which is far away from the coaxial feed structure, and the output probe is positioned at the opening; and an antenna radiation opening surface is arranged at one end of the metal cavity far away from the coaxial feed structure.
Electromagnetic signals are input from the coaxial feed structure, the electromagnetic signals pass through the double-frequency matching structure, the double-resonance mode is achieved, the metamaterial filtering resonance structure is used for filtering and shielding the electromagnetic signals outside two required working frequency bands, and finally the electromagnetic signals are emitted out of the antenna radiation opening face through the output probe. Thereby realize dual-frenquency output, whole antenna adopts metamaterial self characteristic to realize filtering function, has avoided the introduction of wave filter to effectively reduced the size of antenna, the setting up of metamaterial antenna can further reduce the volume of antenna, thereby has miniaturized characteristics.
Furthermore, the metamaterial filtering resonance structure comprises a plurality of metamaterial resonance units which are sequentially connected, each metamaterial resonance unit comprises a square frame, a first part and a second part are arranged in each square frame, the second part is the same as the first part in structure, and the second part and the first part are symmetrically arranged; the first component and the second component comprise supporting rods perpendicular to the square frame, square parts are arranged on two sides of each supporting rod, and the square parts are connected with one ends, close to the center of the square frame, of the supporting rods through connecting rods;
the gap between the square and the square is consistent with the gap between the first component and the second component in size; the supporting rods of the metamaterial resonance units and the output probes are located on the central axis of the metal cavity.
Furthermore, the dual-frequency matching structure comprises a deformed metamaterial resonance unit connected with the metamaterial filtering resonance structure and the coaxial feed structure; the metamaterials deformation resonance unit comprises a frame, a third component and a fourth component which are arranged oppositely, and the third component is the same as the first component in structure;
the fourth component also comprises a support rod and a square connected with the support rod through a connecting rod, and the top point of the square of the fourth component, which is far away from the connecting rod, is chamfered with a round angle; the deformed metamaterial resonance unit and the metamaterial filtering resonance structure are positioned on the same plane; the fourth component is close to the metamaterial filtering resonance structure.
Furthermore, the dual-frequency matching structure further comprises a matching compensation structure arranged on one side, close to the coaxial feed structure, of the deformed metamaterial resonance unit, and the matching compensation structure is connected with the third component; the matching compensation structure comprises a matching rod, the two ends of the matching rod are connected with compensation blocks, and the two compensation blocks are located on one side, away from the metamaterial filtering resonance structure, of the matching rod.
Further, the coaxial feed structure comprises a coaxial connector and a coaxial probe, the coaxial connector is perpendicular to the metal cavity, and the coaxial probe is perpendicular to the matching rod; the coaxial probe penetrates through the side wall of the metal cavity and is abutted to the matching rod.
Furthermore, the metal cavity is rectangular, and a gap is formed between the double-frequency matching structure and the inner wall of the end point of the metal cavity; and gaps are reserved between the two sides of the metamaterial filtering resonance structure and the inner wall of the metal cavity.
The invention has the beneficial effects that:
the antenna realizes double-frequency output of electromagnetic signals by the mutual matching of the coaxial feed structure, the double-frequency matching structure, the metamaterial filtering resonance structure, the output probe and the antenna radiation opening surface, the whole antenna adopts the self characteristic of the metamaterial to realize the filtering function, and the introduction of a filter is avoided, so that the size of the antenna is effectively reduced, the volume of the antenna can be further reduced by the arrangement of the metamaterial antenna, and the antenna has the characteristic of miniaturization.
Drawings
FIG. 1 is a schematic sectional view of an embodiment in front view;
FIG. 2 is a perspective view of the first embodiment in a first installation state;
FIG. 3 is a schematic perspective view of a second embodiment in an assembled state;
FIG. 4 is a schematic top view of a metamaterial resonant unit;
FIG. 5 is a schematic top view of a metamaterials resonant unit;
FIG. 6 is an exploded view of a dual frequency matching configuration;
FIG. 7 is an enlarged schematic view at A in FIG. 1;
FIG. 8 is a schematic perspective view of a metamaterial filter resonator structure and a dual-frequency matching structure;
fig. 9 is a graph showing the relationship between the reflection coefficient and the frequency of the antenna obtained by the present embodiment.
Wherein, 1, a metal cavity; 110. an opening; 2. a metamaterial filtering resonance structure; 210. a metamaterial resonance unit; 211. a square frame; 212. a first member; 2121. a strut; 2122. square; 2123. a connecting rod; 213. a second component; 3. a coaxial feed structure; 310. a coaxial joint; 320. a coaxial probe; 4. a dual-frequency matching structure; 410. a metamorphic metamaterial resonance unit; 411. a third component; 412. a fourth component; 4121. round corners; 420. matching a compensation structure; 421. a matching rod; 422. a compensation block; 5. outputting the probe; 6. an antenna radiation aperture; 7. a hollow waveguide space.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, a metamaterial dual-frequency filtering antenna includes a metal cavity 1, a metamaterial filtering resonant structure 2 is disposed inside the metal cavity 1, a coaxial feed structure 3 is disposed at one end of the metal cavity 1, and an opening 110 is disposed at the other end of the metal cavity 1; the metamaterial filtering resonance structure 2 is connected with the coaxial feed structure 3 through a double-frequency matching structure 4 with a double-resonance mode; an output probe 5 is arranged at one end of the metamaterial filtering resonant structure 2 far away from the coaxial feed structure 3, and the output probe 5 is positioned at the opening 110; the end of the metal cavity 1 far from the coaxial feed structure 3 is provided with a rectangular antenna radiation opening surface 6, and in other embodiments of the present invention, the antenna radiation opening surface 6 may also be circular, horn-shaped, or polygonal, etc. The metal cavity 1 is rectangular, a gap is formed between the double-frequency matching structure 4 and the inner wall of the end point of the metal cavity 1, and the length of the gap is 5 mm; and gaps are reserved between the upper side and the lower side of the metamaterial filtering resonance structure 2 and the inner wall of the metal cavity 1. The gap between the dual-frequency matching structure 4 and the metamaterial filtering resonance structure 2 and the metal cavity 1 forms a hollow waveguide space 7. The front side and the rear side of the metamaterial filtering resonant structure 2 are connected with the side wall of the metal cavity 1. The arrangement of the metal cavity 1, the metamaterial filtering resonance structure 2 and the hollow waveguide space 7 enables the antenna to have two working modes, the frequency bands of the two working modes are two pass bands, and the frequency bands outside the frequency band of the working mode are stop bands, so that the antenna has a double-frequency filtering function. The metal cavity 1 and the antenna radiation opening surface 6 have two connection modes, the first one is as shown in figure 2, the metal cavity 1 and the back surface of the antenna radiation opening surface 6 are connected and installed; in the second type, as shown in fig. 3, the metal cavity 1 is connected to the side of the antenna radiation opening surface 6.
As shown in fig. 1 and 8, the metamaterial filtering resonant structure 2 includes a plurality of metamaterial resonant units 210 connected in sequence, in this embodiment, the number of the metamaterial resonant units 210 is seven, and the number of the metamaterial resonant units 210 is selected according to actual requirements. The metamaterial resonant unit 210 is shown in fig. 4 and includes a block 211, a first part 212 and a second part 213 are disposed in the block 211, the second part 213 and the first part 212 have the same structure, and the second part 213 and the first part 212 are symmetrically disposed; the first part 212 comprises a strut 2121 perpendicular to the square frame 211, a square 2122 is arranged on each side of the strut 2121, and the square 2122 is connected with one end of the strut 2121 close to the center of the square frame 211 through a connecting rod 2123;
the gap between the square 2122 and the block 211 is of the same size as the gap between the first part 212 and the second part 213; the struts 2121 and the output probes 5 of the several metamaterial resonant units 210 are located on the central axis of the metal cavity 1.
As shown in fig. 6, the dual-frequency matching structure 4 includes an metamaterials resonant unit 410 connected with the metamaterial filtering resonant structure 2 and the coaxial feeding structure 3; the metamaterials resonant unit 410 is shown in FIG. 5 and comprises a block 211, a third part 411 and a fourth part 412 which are oppositely arranged, wherein the third part 411 is identical to the first part 212 in structure; fourth part 412 also includes struts 2121 and squares 2122 connected to struts 2121 by connecting rods 2123, and the squares 2122 of fourth part 412 are rounded at a radius 4121 away from the apex of connecting rods 2123, the radius of fillet 4121 being 3 mm. The deformed metamaterial resonant unit 410 and the metamaterial filtering resonant structure 2 are positioned on the same plane; the fourth part 412 is close to the metamaterial filter resonator structure 2.
As shown in fig. 6-7, the dual-frequency matching structure 4 further includes a matching compensation structure 420 disposed on a side of the metamaterials resonant unit 410 close to the coaxial feeding structure 3, and the thickness of the matching compensation structure 420 is 0.5 mm. The matching compensation structure 420 is connected to the third part 411; the matching compensation structure 420 comprises a matching rod 421, two ends of the matching rod 421 are connected with compensation blocks 422, and the two compensation blocks 422 are located on one side of the matching rod 421 away from the metamaterial filtering resonant structure 2. The length of the matching rod 421 is 13mm, the width of the matching rod 421 is 1.5mm, and the distance between the two compensating blocks 422 is 3.5 mm. The matching compensation structure 420 and the deformed metamaterial resonant unit 410 can realize good matching of two frequency bands and reduce reflection between the coaxial feed and the metamaterial, so that smooth transmission of electromagnetic signals between the coaxial feed structure 3 and the metamaterial filtering resonant structure 2 is realized.
As shown in fig. 9, the relationship between the antenna reflection coefficient (S1,1, dB) and the frequency (GHz) obtained by electromagnetic signal transmission using the antenna of the present embodiment shows that the antenna has two operating frequency bands, and the center frequencies of the two operating frequency bands are 3GHz and 4.24GHz, respectively. The impedance bandwidth (S1, the frequency bandwidth of 1< -10dB, namely when the ordinate is-10, the absolute value of the difference value of the front point and the rear point which are closest to the abscissa by 3 GHz) corresponding to the 3GHz working frequency band is 260 MHz; the impedance bandwidth (S1, a bandwidth of 1< -10dB, i.e., an absolute value of a difference between two points before and after a point closest to 4.24GHz on the abscissa when the ordinate is-10) corresponding to the 4.24GHz operating band is 280 MHz. The impedance bandwidth (S1,1, dB) in the regions outside the bandwidths of the two operating bands, i.e., the regions of frequency < 2.82GHz, 3.38< frequency <3.89GHz, and frequency >4.6GHz, tends to 0. Namely: signals other than the two operating frequency bands cannot be transmitted from the input to the output of the antenna.
Claims (6)
1. The metamaterial dual-frequency filtering antenna is characterized by comprising a metal cavity (1), wherein a metamaterial filtering resonance structure (2) is arranged inside the metal cavity (1), a coaxial feed structure (3) is arranged at one end of the metal cavity (1), and an opening (110) is formed in the other end of the metal cavity (1); the metamaterial filtering resonance structure (2) is connected with the coaxial feed structure (3) through a double-frequency matching structure (4) with a double-resonance mode; an output probe (5) is arranged at one end, far away from the coaxial feed structure (3), of the metamaterial filtering resonance structure (2), and the output probe (5) is located at the opening (110); and an antenna radiation opening surface (6) is arranged at one end of the metal cavity (1) far away from the coaxial feed structure (3).
2. The metamaterial dual-band filtering antenna according to claim 1, wherein the metamaterial filtering resonator structure (2) comprises a plurality of metamaterial resonator units (210) connected in sequence, the metamaterial resonator units (210) comprise a square frame (211), a first part (212) and a second part (213) are arranged in the square frame (211), the second part (213) is structurally the same as the first part (212), and the second part (213) is symmetrically arranged with the first part (212); the first component (212) and the second component (212) respectively comprise a supporting rod (2121) perpendicular to the square frame (211), the two sides of the supporting rod (2121) are respectively provided with a square (2122), and the square (2122) is connected with one end, close to the center of the square frame (211), of the supporting rod (2121) through a connecting rod (2123);
the gap between the square (2122) and the block (211) is the same as the gap between the first part (212) and the second part (213); the struts (2121) and the output probes (5) of the metamaterial resonant units (210) are all located on the central axis of the metal cavity (1).
3. The metamaterial dual-frequency filter antenna according to claim 2, wherein the dual-frequency matching structure (4) comprises an anamorphic metamaterial resonant unit (410) connected to the metamaterial filter resonant structure (2) and the coaxial feed structure (3); the metamaterials deformation resonant unit (410) comprises a frame (211) and a third part (411) and a fourth part (412) which are arranged oppositely, wherein the third part (411) is the same as the first part (212) in structure;
the fourth part (412) also comprises a strut (2121) and a square part (2122) connected with the strut (2121) through a connecting rod (2123), and the vertex of the square part (2122) of the fourth part (412) far away from the connecting rod (2123) is chamfered with a round angle (4121); the deformation metamaterial resonance unit (410) and the metamaterial filtering resonance structure (2) are positioned on the same plane; the fourth part (412) is close to the metamaterial filter resonator structure (2).
4. The metamaterial dual-frequency filtering antenna according to claim 3, wherein the dual-frequency matching structure (4) further comprises a matching compensation structure (420) disposed on a side of the metamaterials resonant unit (410) close to the coaxial feed structure (3), the matching compensation structure (420) is connected with the third part (411); the matching compensation structure (420) comprises a matching rod (421), two ends of the matching rod (421) are connected with compensation blocks (422), and the two compensation blocks (422) are located on one side, far away from the metamaterial filtering resonance structure (2), of the matching rod (421).
5. The metamaterial dual-frequency filtering antenna according to claim 4, wherein the coaxial feed structure (3) comprises a coaxial connector (310) and a coaxial probe (320), the coaxial connector (310) is perpendicular to the metal cavity (1), and the coaxial probe (320) is perpendicular to the matching rod (421); the coaxial probe (320) penetrates through the side wall of the metal cavity (1) and is abutted with the matching rod (421).
6. The metamaterial dual-frequency filter antenna according to any one of claims 1 to 5, wherein the metal cavity (1) is rectangular, and the dual-frequency matching structure (4) has a gap with an inner wall of an end point of the metal cavity (1); and gaps are reserved between the two sides of the metamaterial filtering resonance structure (2) and the inner wall of the metal cavity (1).
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