CN115189139A - Ultra-wideband low-profile log periodic antenna based on metamaterial structure - Google Patents
Ultra-wideband low-profile log periodic antenna based on metamaterial structure Download PDFInfo
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- CN115189139A CN115189139A CN202210671547.9A CN202210671547A CN115189139A CN 115189139 A CN115189139 A CN 115189139A CN 202210671547 A CN202210671547 A CN 202210671547A CN 115189139 A CN115189139 A CN 115189139A
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- periodic antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/10—Logperiodic antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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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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- 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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/104—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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Abstract
The invention discloses an ultra-wideband low-profile log periodic antenna based on a metamaterial structure, which comprises a log periodic antenna, a feed port, a support mechanism positioned at the bottommost part and a metamaterial array, wherein the metamaterial array is positioned between the log periodic antenna and the feed port and is used for realizing low-profile reflection of dipole unit radiation in the log periodic antenna, and the height of the ultra-wideband low-profile log periodic antenna based on the metamaterial structure is less than one tenth of wavelength. The ultra-wideband low-profile log periodic antenna based on the metamaterial structure can greatly reduce the profile of the antenna and reduce the volume on the premise of ensuring the stable radiation characteristic of the antenna.
Description
Technical Field
The invention relates to the application field of high-gain antennas such as radio, in particular to an ultra-wideband low-profile log periodic antenna based on a metamaterial structure.
Background
The log periodic antenna is one of the hot spots in the research of the field of ultra-wideband feed antennas. By utilizing the characteristics of the unique folded dipole pair, the periodic gradient array and the like, the performance of the antenna can be effectively improved, and the processing cost is reduced. Such as document 1 ("Design of Compact-Polarized Antenna Feed for broadband Radio protocols," IEEE Transactions On Antennas and Propagation, vol.60, no. 5, pp.2210-2218) and document 2 ("The Circuit Electron Antenna: A New concept-Bandwidth Feed for Reflector Antennas With High impedance Efficiency," IEEE Transactions On Antennas and Propagation, vol.61, no. 8, pp.6-3984) and document 3 ("Antenna for communication Antennas Radiation for communication Antennas for detailed Antennas" IEEE Transactions, "Antennas 1525, pp.1525, pp.58) and New broadband Antennas for broadband Radio protocols. The conventional log periodic antenna mostly adopts an inclined antenna structure, and the structure has the following defects:
(1) Large, thickness in document 1 is directly frequency dependent, thickness is in the order of one quarter of a wavelength of the lowest frequency;
(2) The processing is complex, and the structure needs to adopt a three-dimensional structure for assembly processing;
(3) The phase center of the conventional log-periodic antenna is unstable, and the conventional log-periodic antenna mostly adopts an inclined antenna structure, so that dipoles with different lengths in the log-periodic antenna work at different frequency bands and at different heights, and therefore the phase center of the log-periodic antenna can change along with the change of the spatial position of the working dipole and is in a state of unstable phase center.
Disclosure of Invention
Aiming at the technical problems, the invention provides an ultra-wideband low-profile log periodic antenna based on a metamaterial structure, which can greatly reduce the profile and the volume of the antenna and ensure the stability of a phase center on the premise of ensuring the stable radiation characteristic of the antenna.
In order to achieve the technical purpose, the invention adopts the following technical means:
the ultra-wideband low-profile log periodic antenna based on the metamaterial structure comprises a log periodic antenna, a feed port, a support machine arranged at the bottommost part and a metamaterial array, wherein the metamaterial array is arranged between the log periodic antenna and the feed port and used for realizing low-profile reflection of dipole unit radiation in the log periodic antenna, and the height of the ultra-wideband low-profile log periodic antenna based on the metamaterial structure is smaller than one tenth of wavelength.
Furthermore, the metamaterial array is an artificial magnetic conductor with a gradually changing period, the artificial magnetic conductor with the gradually changing period is arranged into a plurality of artificial magnetic conductor units which are circularly arranged on the same plane, the area of a first circular array formed by the artificial magnetic conductor units is equal to the area of a second circular array formed by a plurality of folded dipoles on the log periodic antenna, and the first circular array and the second circular array are concentrically arranged.
Furthermore, each artificial magnetic conductor unit comprises a first medium substrate, a metal floor, a metalized through hole and an umbrella-shaped metal patch, wherein adjacent artificial magnetic conductor units are connected through the first medium substrate and are arranged in a periodic gradient manner, the metal floor is printed on the lower surface of the first medium substrate to reflect electromagnetic waves, a gap exists between the umbrella-shaped metal patches printed on the upper surface of the first medium substrate and adjacent artificial magnetic conductor units, the metalized through hole is located inside the first medium substrate, the upper end of the metalized through hole is connected with the umbrella-shaped metal patch, and the lower end of the metalized through hole is connected with the metal floor.
Furthermore, the projection of the metallized through hole on the umbrella-shaped metal patch is positioned on the central line of the umbrella-shaped metal patch; the width g of the non-metal edge between adjacent umbrella-shaped metal patches is 0.2-6 mm.
Furthermore, the feed port is located at the center below the metamaterial array, and the support machine is connected with the feed port to support and fix the log periodic antenna, the metamaterial array and the feed port.
Further, each folded dipole pair on the log periodic antenna comprises a first dipole rectangular metal patch, a second dipole rectangular metal patch and a second dielectric substrate, wherein the first dipole rectangular metal patch is close to and parallel to the second dipole rectangular metal patch, the first dipole rectangular metal patch and the second dipole rectangular metal patch are printed on the upper surface of the second dielectric substrate layer, and adjacent folded dipole pairs are in close contact connection between the second dielectric substrate layers.
Furthermore, the size of the folded dipole pair on the log periodic antenna gradually increases from the circle center to the circumferential direction, and the size of the artificial magnetic conductor unit corresponding to the size of the folded dipole pair gradually increases from the circle center to the circumferential direction.
The umbrella-shaped metal patch is 0.5-30 mm long, 0.12-4 mm wide and 0.06-1 mm in diameter.
The first dielectric substrate is a microwave dielectric plate, the dielectric constant is 2.2-10.2, and the thickness is 0.1-1 mm.
The second dielectric substrate is a microwave dielectric plate, the dielectric constant is 2.2-10.2, and the thickness is 0.1-4 mm.
Has the advantages that:
(1) Compared with the common log periodic antenna, the ultra-wideband low-profile log periodic antenna based on the metamaterial structure realizes low-profile reflection of radiation of dipole units through the metamaterial array, effectively improves the propagation path of electromagnetic waves from dipoles, greatly reduces the height of the log periodic antenna, reduces the height of the antenna by less than one tenth of wavelength from the original quarter of wavelength, and has stable phase center.
The reason for the reduced height: the traditional log periodic antenna needs to keep a quarter-wavelength distance between a metal ground and the antenna so as to realize the homodromous reflection of electromagnetic waves, so that the height of the antenna is about one quarter of the wavelength, the ultra-wideband low-profile log periodic antenna based on the metamaterial structure provided by the invention adopts the metamaterial structure, the height of the metamaterial structure is not more than one tenth of the wavelength while realizing the electromagnetic waves, and the height of the log periodic antenna obviously reduces the reason for the stability of a phase center: because the traditional log periodic antenna mostly adopts an inclined antenna structure, dipoles with different lengths in the log periodic antenna work in different frequency bands and are also at different heights, the phase center of the log periodic antenna can change along with the change of the space position of the working dipole and is in a state that the phase center is unstable.
(2) The ultra-wideband low-profile log periodic antenna based on the metamaterial structure adopts the microwave dielectric plate, and is simple in structure, easy to process, relatively small in weight and size and low in cost.
Drawings
FIG. 1 is a three-dimensional diagram of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the invention;
wherein, 1 is a log periodic antenna; 2 is artificial magnetic conductor with period gradually changed; 3 is a feed port; 4, a supporting machine is added;
FIG. 2 is a top view of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
wherein g is the width of the non-metallic edge;
FIG. 3 is a side view of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
wherein h1 is the thickness of the first dielectric substrate; h2 is the thickness of the second dielectric substrate;
FIG. 4 is a schematic top view of a log periodic antenna of an ultra wide band low profile log periodic antenna based on a metamaterial structure according to the present invention;
wherein 5 is a folded dipole pair;
FIG. 5 is a top view of a periodically graded artificial magnetic conductor of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
wherein 6 is an artificial magnetic conductor unit;
FIG. 6 is a three-dimensional view of an artificial magnetic conductor unit of the ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
wherein, 7 is a first dielectric substrate; 8 is a metal floor; 9 is a metallized through hole; 10 is an umbrella-shaped metal patch; d is the diameter of the metallized via; w is the width of the umbrella-shaped metal patch; l is the length of the umbrella-shaped metal patch;
fig. 7 is a schematic diagram of a folded dipole element of the present invention;
wherein 11 is a first dipole rectangular metal patch; 12 is a second dipole rectangular metal patch; 13 is a second dielectric substrate; wy1 is the side length of the first dipole rectangular metal patch; wy2 is the side length of the second dipole rectangular metal patch; wx1 is the width of the first dipole rectangular metal patch; wx2 is the width of the second dipole rectangular metal patch; dy is the length of the U-shaped groove; dx is the width of the U-shaped groove;
FIG. 8 is a reflection coefficient curve diagram of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
FIG. 9 is an E-plane main polarization and cross polarization directional diagram of an ultra-wideband low-profile log periodic antenna based on a metamaterial structure according to the present invention;
fig. 10 is an H-plane main polarization and cross polarization directional diagram of the ultra-wideband low-profile log periodic antenna based on the metamaterial structure.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the specific embodiments and the drawings.
Examples
With reference to fig. 1 to 5, the ultra-wideband low-profile log periodic antenna is composed of 4 parts, including a log periodic antenna 1, a periodic gradient artificial magnetic conductor 2, a feed port 3 and a support mechanism 4; the log periodic antenna 1 comprises four groups of folded dipole pairs 5 which are circularly arranged, the number of the folded dipole pairs 5 is 8, and the size of the folded dipole pairs is gradually increased from the circle center to the circumferential direction; the periodic gradient artificial magnetic conductor 2 is composed of four groups of artificial magnetic conductor units 6 which are circularly arranged, the number of the artificial magnetic conductor units 6 is 8, the size of the artificial magnetic conductor units is gradually increased from the circle center to the circumferential direction, the area of a circular array formed by the log periodic antenna 1 is equal to that of a circular array formed by the periodic gradient artificial magnetic conductor 2, and the projections of the two circles are concentric.
As shown in fig. 6, the artificial magnetic conductor unit 6 of the present invention is composed of four parts, including a first dielectric substrate 7, a metal floor 8, a metalized through hole 9, and an umbrella-shaped metal patch 10; the first dielectric substrate 7 has a dielectric constant ∈ r of 2.2 and a thickness ha of 0.2mm.
As shown in fig. 7, the folded dipole pair 5 is composed of three parts, including a first dipole rectangular metal patch 11, a second dipole rectangular metal patch 12, and a second dielectric substrate 13, where the dielectric constant ∈ r of the second dielectric substrate 13 is 3.55, and the thickness h is 2mm.
The 8 artificial magnetic conductor units 6 have the same structure and size, and for any artificial magnetic conductor unit 6, for example, for the sixth umbrella-shaped metal patch, the length L of the umbrella-shaped metal patch 10 is 10mm, the width W of the umbrella-shaped metal patch 10 is 0.4mm, and the diameter d of the metalized through hole 9 is 0.2mm.
In the 6 th dipole, the side lengths Wy1 and Wy2 of the upper layer loading the first dipole rectangular metal patch 11 and the second dipole rectangular metal patch 12 are respectively 9.5mm and 10mm, the widths Wx1 and Wx2 are respectively 0.36mm and 0.38mm, the length Dy of the U-shaped groove is 9.1mm, and the width Dx is 0.7mm.
From the above analysis, the ultra-wideband low-profile log periodic antenna based on the metamaterial structure has the overall thickness of 2.2mm and the thickness of 0.05 wavelength.
As can be obtained from FIG. 8, the ultra-wideband low-profile log periodic antenna based on the metamaterial structure has the bandwidth with the reflection coefficient less than-10 dB and can cover the frequency band range of 7-14 GHz.
As shown in fig. 9 and 10, in the frequency band of 7-14GHz, the intersection plan of the antenna radiation patterns is smaller than-10 dB in the whole frequency band, and meanwhile, the beam width can be kept consistent in the whole frequency band, and the-10 dB beam width is basically controlled in the angle range of-30 degrees to 30 degrees in the whole frequency band.
Therefore, the ultra-wideband low-profile log periodic antenna based on the metamaterial structure can effectively realize the antenna characteristics of a low-profile ultra-wideband.
In addition to the effects of the present disclosure as described above, further advantages and features of the present disclosure will be clearly understood from the above description of the present disclosure by those skilled in the art.
It will be apparent to those skilled in the art that the present disclosure described above is not limited by the above-described embodiments and drawings, and that various substitutions, modifications and variations can be made in the present disclosure without departing from the spirit or scope of the present disclosure. Accordingly, the scope of the present disclosure is defined by the appended claims, and all variations or modifications derived from the meaning, scope, and equivalent concept of the claims are intended to fall within the scope of the present disclosure.
The various embodiments described above can be combined to provide further embodiments.
These and other changes can be made to the present embodiments in light of the above detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.
Claims (10)
1. The ultra-wideband low-profile log periodic antenna based on the metamaterial structure comprises a log periodic antenna (1), a feed port (3) and a support mechanism (4) located at the bottommost part, and is characterized by further comprising a metamaterial array, wherein the metamaterial array is located between the log periodic antenna and the feed port (3) and used for achieving low-profile reflection of radiation of a dipole unit in the log periodic antenna (1), and the height of the ultra-wideband low-profile log periodic antenna based on the metamaterial structure is smaller than one tenth of wavelength.
2. The ultra-wideband low-profile log periodic antenna based on the metamaterial structure according to claim 1, wherein the metamaterial array is a periodically graded artificial magnetic conductor (2), the periodically graded artificial magnetic conductor (2) is arranged as a plurality of artificial magnetic conductor units (6) which are circularly arranged on the same plane, the area of a first circular array formed by the plurality of artificial magnetic conductor units (6) is equal to the area of a second circular array formed by a plurality of folded dipole pairs (5) on the log periodic antenna (1), and the first circular array and the second circular array are concentrically arranged.
3. The ultra wide band low-profile log periodic antenna based on the metamaterial structure as claimed in claim 1, wherein each artificial magnetic conductor unit (6) comprises a first dielectric substrate (7), a metal floor (8), a metalized through hole (9) and umbrella-shaped metal patches (10), wherein adjacent artificial magnetic conductor units (6) are connected through the first dielectric substrate (7) and are arranged in a periodic gradient manner, the metal floor (8) is printed on the lower surface of the first dielectric substrate (7) to reflect electromagnetic waves, a gap exists between the umbrella-shaped metal patches (10) of the adjacent artificial magnetic conductor units (6) and printed on the upper surface of the first dielectric substrate (7), the metalized through hole (9) is located inside the first dielectric substrate (7), the upper end of the metalized through hole (9) is connected with the umbrella-shaped metal patches (10), and the lower end of the metalized through hole (9) is connected with the metal floor (8).
4. The ultra-wideband low-profile log periodic antenna based on a metamaterial structure as claimed in claim 3, wherein a projection of the metallized via (9) on the umbrella-shaped metal patch (10) is located on a centerline of the umbrella-shaped metal patch (10); the width g of the non-metal edge between adjacent umbrella-shaped metal patches is 0.2-6 mm.
5. The ultra-wideband low-profile log periodic antenna based on the metamaterial structure as claimed in claim 1, wherein the feed port (3) is located at the center below the metamaterial array, and the support mechanism (4) is connected with the feed port (3) to support and fix the log periodic antenna (1), the metamaterial array and the feed port (3).
6. The ultra-wideband low-profile log periodic antenna based on a metamaterial structure as claimed in claim 1, wherein each folded dipole pair (5) on the log periodic antenna (1) comprises a first dipole rectangular metal patch (11), a second dipole rectangular metal patch (12) and a second dielectric substrate (13), wherein the first dipole rectangular metal patch (11) is adjacent to and parallel to the second dipole rectangular metal patch (12), the first dipole rectangular metal patch (11) and the second dipole rectangular metal patch (12) are printed on the upper surface of the second dielectric substrate layer (13), and adjacent folded dipole pairs (5) are connected in close contact between the second dielectric substrate layer (13).
7. The ultra-wideband low-profile log periodic antenna based on a metamaterial structure as claimed in claim 1, wherein the folded dipole pair (5) on the log periodic antenna (1) has a size gradually increasing from the center to the circumferential direction, and the artificial magnetic conductor unit (6) has a size gradually increasing from the center to the circumferential direction corresponding to the size of the folded dipole pair (5).
8. The ultra-wideband low-profile log periodic antenna based on a metamaterial structure as claimed in claim 3, wherein the length of the umbrella-shaped metal patch (10) is 0.5mm to 30mm, the width of the umbrella-shaped metal patch (10) is 0.12mm to 4mm, and the diameter of the metalized through hole (9) is 0.06mm to 1mm.
9. The ultra-wideband low-profile log periodic antenna based on the metamaterial structure as claimed in claim 3, wherein the first dielectric substrate (7) is a microwave dielectric plate, the dielectric constant is 2.2-10.2, and the thickness is 0.1 mm-1 mm.
10. The antenna of claim 6, wherein the second dielectric substrate (13) is a microwave dielectric plate with a dielectric constant of 2.2-10.2 and a thickness of 0.1-4 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210671547.9A CN115189139A (en) | 2022-06-14 | 2022-06-14 | Ultra-wideband low-profile log periodic antenna based on metamaterial structure |
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| CN202210671547.9A CN115189139A (en) | 2022-06-14 | 2022-06-14 | Ultra-wideband low-profile log periodic antenna based on metamaterial structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621741A (en) * | 2022-10-28 | 2023-01-17 | 惠州硕贝德无线科技股份有限公司 | Phased array antenna, radio frequency wireless circuit and 5G mobile device |
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2022
- 2022-06-14 CN CN202210671547.9A patent/CN115189139A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115621741A (en) * | 2022-10-28 | 2023-01-17 | 惠州硕贝德无线科技股份有限公司 | Phased array antenna, radio frequency wireless circuit and 5G mobile device |
| CN115621741B (en) * | 2022-10-28 | 2023-12-15 | 惠州硕贝德无线科技股份有限公司 | Phased array antenna, radio frequency wireless circuit and 5G mobile device |
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