CN113097704A - Low-profile dual-frequency common-caliber monopole antenna based on cross-layer folding structure - Google Patents
Low-profile dual-frequency common-caliber monopole antenna based on cross-layer folding structure Download PDFInfo
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- CN113097704A CN113097704A CN202110282782.2A CN202110282782A CN113097704A CN 113097704 A CN113097704 A CN 113097704A CN 202110282782 A CN202110282782 A CN 202110282782A CN 113097704 A CN113097704 A CN 113097704A
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
Abstract
The invention discloses a low-profile dual-frequency common-caliber monopole antenna based on a cross-layer folding structure. The antenna comprises an upper dielectric substrate, a lower dielectric substrate and a feed probe; the upper dielectric substrate is directly stacked above the lower dielectric substrate; the upper dielectric substrate is provided with a first non-metallized via hole; the lower dielectric substrate is provided with a second non-metallized through hole; the feed probe directly feeds power through the second non-metalized via and the first non-metalized via. The invention has the advantages that the thickness of the patch antenna is further reduced on the premise of ensuring that the two frequency bands have enough bandwidth, the central frequencies of the two frequency bands can be independently adjusted, and the patch antenna is suitable for various application scenes.
Description
Technical Field
The invention relates to the field of antennas, in particular to a low-profile dual-frequency common-caliber monopole antenna based on a cross-layer folding structure.
Background
Under the background that the total volume of a system is limited due to the increase of communication frequency bands, the antenna has the advantages of multi-band coverage capability, wide signal coverage range and low profile and has great research significance. Conventional monopole antennas, dielectric resonator antennas, and the like easily achieve multi-frequency operation and wide coverage, but their heights are high.
A monopole antenna is a vertical antenna with a quarter wavelength. The antenna is mounted on a ground plane, which may be the actual ground or an artificial ground plane such as a vehicle body. The feed of the monopole antenna is made using a coaxial cable at the lower end and the ground conductor of the feed is connected to the platform. In free space, the radiation pattern of a quarter-wave monopole antenna in the vertical plane is similar in shape to the pattern of a half-wave dipole antenna in the vertical plane, but without subsurface radiation. In the horizontal plane, the vertical monopole antenna is omni-directional.
A dielectric resonator antenna is a resonant antenna, which is made of a low-loss microwave dielectric material, and its resonant frequency is determined by the size, shape and relative permittivity of the resonator.
The currently used methods for realizing Dual frequency by using a microstrip patch-based low-profile cone beam antenna mainly include two modes, namely, a transverse parasitic mode (x.dai, t.zhou and g.cui, "Dual-band microstrip circular antenna with a monopolar radiation pattern," IEEE Antennas with a small performance pattern, vol.15, pp.1004-1007,2016) and a longitudinal stacking mode (s.y.lin and k.l.wong, "a stacked microstrip micro antenna for Dual-band antenna radiation," micro.op.technol.let, vol.28, No.3, pp.202-204, feb.2001.). They all result in an increased volume and still have a high thickness or insufficient bandwidth to completely cover both WLAN bands.
Disclosure of Invention
The invention overcomes the defects and shortcomings, provides the low-profile dual-frequency common-caliber monopole antenna, and further reduces the thickness of the antenna on the premise of ensuring enough bandwidth by fully utilizing space. The center frequencies of the two passbands generated by the invention are independent from each other, and the maximum radiation directions are kept consistent.
The purpose of the invention is realized by at least one of the following technical solutions.
A low-profile dual-frequency common-caliber monopole antenna based on a cross-layer folding structure comprises an upper-layer dielectric substrate, a lower-layer dielectric substrate and a feed probe; the upper dielectric substrate is directly stacked above the lower dielectric substrate;
an annular patch and a first circular patch are printed on the upper surface of the upper-layer medium substrate, and the first circular patch is surrounded by the annular patch;
the upper surface of the lower medium substrate is printed with a second circular patch, the lower surface of the lower medium substrate is printed with a metal floor, and the second circular patch is attached to the lower surface of the upper medium substrate;
a first metalized through hole for connecting the annular patch and the second circular patch and a second metalized through hole for connecting the first circular patch and the second circular patch are formed in the upper-layer dielectric substrate, and a first nonmetal via hole is formed in the upper-layer dielectric substrate;
a third metalized through hole for connecting the second circular patch with the metal floor is formed in the lower-layer dielectric substrate, and a second nonmetal through hole is formed in the lower-layer dielectric substrate;
the feed probe directly feeds power through the second non-metalized via and the first non-metalized via.
Further, the feed probe passes through the second non-metalized via to connect with the second circular patch for exciting the first pass band.
Further, the feed probe is connected to the first circular patch through the first non-metalized via for exciting a second pass band.
Further, a radiation gap is reserved between the first circular patch and the annular patch.
Furthermore, the second circular patch is etched with fan-shaped gaps and coupling annular gaps which are uniformly distributed along the circumference;
the fan-shaped gap is arranged outside the coupling annular gap; and a metal arm is left between the adjacent gaps of the fan-shaped gaps.
Furthermore, the first metalized through holes and the second metalized through holes are uniformly distributed along the circumference by taking the circle center of the first circular patch in the upper-layer dielectric substrate as the circle center.
Furthermore, the third metalized through holes and the metal arms are uniformly distributed along the circumference with the circle center of the second circular patch in the lower-layer dielectric substrate as the circle center.
Further, the circle centers of the first non-metalized via hole in the upper-layer dielectric substrate and the first circular patch coincide.
Further, the circle centers of a second non-metalized via hole in the lower-layer dielectric substrate and a second circular patch coincide.
Further, the upper dielectric substrate and the lower dielectric substrate are aligned and fixed in relative positions through plastic screws.
Compared with the prior art, the low-profile dual-frequency common-caliber monopole antenna has the following advantages:
(1) the invention ensures enough bandwidth while reducing the thickness, and reduces the volume and the weight of the antenna;
(2) the center frequencies of the two frequency bands can be independently adjusted, so that the method is suitable for various application scenes;
(3) the directional diagram generated by the invention keeps consistent in the two frequency bands, and the receiving quality during the switching of the frequency bands is ensured.
Drawings
Fig. 1 is a schematic diagram of a low-profile dual-band common-aperture monopole antenna based on a cross-layer folded structure according to the present invention.
Fig. 2 is a schematic longitudinal cross-sectional view of a low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure according to the present invention.
Fig. 3 is a schematic structural diagram of an upper surface of a low-profile dual-band common-caliber monopole antenna upper dielectric substrate based on a cross-layer folding structure according to the present invention.
Fig. 4 is a schematic structural diagram of a second circular patch of a low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure according to the present invention.
FIG. 5 is a graph showing the results of the reflection coefficient in example 1 of the present invention.
Fig. 6 is a schematic diagram of gain frequency response in embodiment 1 of the present invention.
Fig. 7 is the directional diagram of embodiment 1 of the present invention at each resonance point, wherein fig. 7a is at 2.31GHz, fig. 7 is at 2.52GHz, fig. 7c is at 5.19GHz, and fig. 7d is at 5.73 GHz.
FIG. 8 is a graph showing the results of the reflection coefficient in example 2 of the present invention.
Fig. 9 is a schematic diagram of the gain frequency response in embodiment 2 of the present invention.
Fig. 10 is the directional diagram of embodiment 2 of the present invention at each resonance point, wherein fig. 10a is at 2.26GHz, fig. 10b is at 2.44GHz, fig. 10c is at 4.74GHz, and fig. 10d is at 5.24 GHz.
Fig. 11 is a schematic diagram of the reflection coefficient of a low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure according to the invention changing with Rp3 and Rp 5.
Detailed Description
In the following description, technical solutions are set forth in conjunction with specific figures in order to provide a thorough understanding of the present invention. This application is capable of embodiments in many different forms than those described herein and it is intended that all such modifications that would occur to one skilled in the art are deemed to be within the scope of the invention.
The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in one or more embodiments of the present specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, etc. may be used herein to describe various information in one or more embodiments of the specification, these information should not be limited by these terms, which are used only for distinguishing between similar items and not necessarily for describing a sequential or chronological order of the features described in one or more embodiments of the specification. Furthermore, the terms "having," "including," and similar referents, are intended to cover a non-exclusive scope, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to the particular details set forth, but may include other inherent information not expressly listed for such steps or modules.
A low-profile dual-frequency common-caliber monopole antenna based on a cross-layer folding structure is shown in figures 1 and 2 and comprises an upper dielectric substrate 2, a lower dielectric substrate 4 and a feed probe 15; the upper dielectric substrate 2 is directly stacked above the lower dielectric substrate 4;
as shown in fig. 3, an annular patch 5 and a first circular patch 6 are printed on the upper surface of the upper-layer dielectric substrate 2, and the first circular patch 6 is surrounded by the annular patch 5;
as shown in fig. 4, a second circular patch 3 is printed on the upper surface of the lower dielectric substrate 4, a metal floor 1 is printed on the lower surface of the lower dielectric substrate, and the second circular patch 3 is attached to the lower surface of the upper dielectric substrate 2;
a first metalized through hole 9 for connecting the annular patch 5 and the second circular patch 3 and a second metalized through hole 10 for connecting the first circular patch 6 and the second circular patch 3 are formed in the upper-layer dielectric substrate 2, and a first nonmetal through hole 16 is formed in the upper-layer dielectric substrate 2;
a third metalized through hole 11 for connecting the second circular patch 3 and the metal floor 1 is formed in the lower-layer dielectric substrate 4, and a second nonmetal through hole 7 is formed in the lower-layer dielectric substrate 4;
the feed probe 15 feeds directly through the second non-metallised via 7 and the first non-metallised via 16.
The feed probe 15 is connected to the second circular patch 3 through the second non-metallized via 7 for exciting a first pass band.
The feed probe 15 is connected to the first circular patch 6 through a first non-metallised via 16 for exciting a second pass band.
A radiation gap 17 is left between the first circular patch 6 and the annular patch 5.
As shown in fig. 4, the second circular patch 3 is etched with fan-shaped slits 12 and coupling annular slits 13 uniformly distributed along the circumference;
the fan-shaped gap 12 is arranged outside the coupling annular gap 13; metal arms 14 are left between adjacent ones of the fan-shaped slits 12.
The first metalized via holes 9 and the second metalized via holes 10 are uniformly distributed along the circumference with the circle center of the first circular patch 6 in the upper-layer dielectric substrate 2 as the circle center.
The third metallized through holes 11 and the metal arms 14 are uniformly distributed along the circumference with the center of a circle of the second circular patch 3 in the lower-layer dielectric substrate 4 as the center of the circle.
The first non-metallized via hole 16 in the upper dielectric substrate 2 coincides with the center of the first circular patch 6.
The second non-metallized via hole 7 in the lower dielectric substrate 4 coincides with the circle center of the second circular patch 3.
The upper dielectric substrate 2 and the lower dielectric substrate 4 are aligned and fixed in relative positions by plastic screws 8.
Example 1
In this embodiment, a low-profile dual-band common-aperture monopole antenna with center frequencies of 2.4GH and 5.5GHz, respectively, is designed and manufactured.
In this embodiment, the dielectric constants ε of the upper dielectric substrate 2 and the lower dielectric substrate 4rAre all 2.2, and the thickness H is all 1.57 mm.
In this embodiment, the radius Rp3 of the first circular patch 6 is 26 mm; the inner radius R5 of the annular patch 5 is 29mm, and the outer radius Rp2 is 47 mm; the straight diameter D1 of the first metalized via 9 is 0.7mm, the number N1 is 20, and the distance L1 from the center of the circle is 32 mm; the straight via D2 of the second metalized via 10 is 0.65mm, the number N2 is 14, and the distance L2 from the center of the circle is 20.5 mm.
In this embodiment, the radius Rp1 of the second circular patch 3 is 35 mm; the radius Rg of the metal floor 1 is 80 mm; the straight through D3 of the third metalized via 11 is 0.8mm, the number N3 is 20, and the distance L3 from the center of the circle is 32.3 mm.
In this embodiment, the inner radius R1 of the coupling annular slot 13 is 3.7mm, and the outer radius R2 is 4.7 mm; the inner radius R3 of the fan-shaped slot 12 is 9mm, the outer radius R4 is 17.5mm, and the width thereof is
As shown in FIG. 5, it can be found from simulation and measured reflection coefficient of the low-profile dual-frequency common-aperture monopole antenna based on the cross-layer folded structure that the measured-10 dB impedance bandwidth is 2.34-2.61GHz and 5.11-5.92GHz, and can completely cover the WLAN application frequency bands of 2.4-2.484 GHz, 5.150-5.35 GHz and 5.725-5.825 GHz.
As shown in fig. 6, it can be found from the gain frequency response curve of the low-profile dual-band common-aperture monopole antenna based on the cross-layer folded structure that the gain is relatively stable, and the measured gain fluctuation ranges of the two frequency bands are 5.2-5.8dBi and 3.7-5 dBi.
As shown in fig. 7a, 7b, 7c, and 7d, the radiation patterns of the low-profile dual-band common-aperture monopole antenna based on the cross-layer folded structure at 4 resonant frequency points are found to be consistent in two frequency bands.
Example 2:
in this embodiment, a low-profile dual-frequency common-aperture monopole antenna with center frequencies of 2.35GH and 5GHz is designed.
In this embodiment, the dielectric constants ε of the upper dielectric substrate 2 and the lower dielectric substrate 4rAre all 2.2, and the thickness H is all 1.57 mm.
In this embodiment, the radius Rp3 of the first circular patch 6 is 28 mm; the inner radius R5 of the annular patch 5 is 28.7mm, and the outer radius Rp2 is 46 mm; the straight diameter D1 of the first metalized via 9 is 0.7mm, the number N1 is 20, and the distance L1 from the center of the circle is 29.4 mm; the straight via D2 of the second metalized via 10 is 0.8mm, the number N2 is 14, and the distance L2 from the center of the circle is 22.5 mm.
In this embodiment, the radius Rp1 of the second circular patch 3 is 35 mm; the radius Rg of the metal floor 1 is 80 mm; the straight through D3 of the third metalized via 11 is 0.8mm, the number N3 is 20, and the distance L3 from the center of the circle is 32.3 mm.
In this embodiment, the inner radius R1 of the coupling annular slot 13 is 3mm, and the outer radius R2 is 4 mm; the inner radius R3 of the fan-shaped slot 12 is 9mm, the outer radius R4 is 17.5mm, and the width thereof is
As shown in FIG. 8, the-10 dB impedance bandwidth is 2.23-2.48GHz and 4.66-5.40GHz according to the simulated reflection coefficient of the low-profile dual-frequency common-caliber monopole antenna based on the cross-layer folding structure.
As shown in fig. 9, it can be found from the gain frequency response curve of the low-profile dual-band common-aperture monopole antenna based on the cross-layer folded structure that the gain is relatively stable, and the simulated gain fluctuation ranges of the two frequency bands are 4.63-5.56dBi and 5.6-6.18 dBi.
As shown in fig. 10a, 10b, 10c, and 10d, the radiation patterns of the low-profile dual-band common-aperture monopole antenna based on the cross-layer folded structure at 4 resonant frequency points are found to be consistent in two frequency bands.
As shown in fig. 11, from the reflection coefficient of the low-profile dual-band common-aperture monopole antenna based on the cross-layer folding structure varying with changes of Rp3 and Rp5, it can be found that adjusting the two parameters can adjust the center frequency of the second pass band while keeping the center frequency of the first pass band substantially constant.
In summary, the low-profile dual-frequency common-aperture monopole antenna based on the cross-layer folding structure of the invention can ensure sufficient bandwidth, stable directional diagram and gain under a very low profile, and the frequency can be independently adjusted according to the application frequency band.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a low section dual band is bore monopole antenna altogether based on cross-layer beta structure which characterized in that: the device comprises an upper dielectric substrate (2), a lower dielectric substrate (4) and a feed probe (15); the upper dielectric substrate (2) is directly stacked above the lower dielectric substrate (4);
an annular patch (5) and a first circular patch (6) are printed on the upper surface of the upper-layer dielectric substrate (2), and the first circular patch (6) is surrounded by the annular patch (5);
a second circular patch (3) is printed on the upper surface of the lower-layer dielectric substrate (4), a metal floor (1) is printed on the lower surface of the lower-layer dielectric substrate, and the second circular patch (3) is attached to the lower surface of the upper-layer dielectric substrate (2);
a first metalized through hole (9) for connecting the annular patch (5) and the second circular patch (3) and a second metalized through hole (10) for connecting the first circular patch (6) and the second circular patch (3) are formed in the upper-layer dielectric substrate (2), and a first nonmetal through hole (16) is formed in the upper-layer dielectric substrate (2);
a third metalized through hole (11) for connecting the second circular patch (3) and the metal floor (1) is formed in the lower-layer dielectric substrate (4), and a second nonmetal through hole (7) is formed in the lower-layer dielectric substrate (4);
the feed probe (15) directly feeds power through the second non-metallized via (7) and the first non-metallized via (16).
2. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 1, wherein: the feed probe (15) penetrates through the second non-metalized through hole (7) to be connected with the second circular patch (3).
3. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 2, wherein: the feed probe (15) penetrates through the first non-metalized through hole (16) to be connected with the first circular patch (6).
4. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 1, wherein: a radiation gap (17) is reserved between the first circular patch (6) and the annular patch (5).
5. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 1, wherein: the second circular patch (3) is etched with fan-shaped gaps (12) and coupling annular gaps (13) which are uniformly distributed along the circumference;
the fan-shaped gap (12) is arranged outside the coupling annular gap (13); and a metal arm (14) is reserved between adjacent gaps of the fan-shaped gaps (12).
6. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 1, wherein: the first metalized through holes (9) and the second metalized through holes (10) are uniformly distributed along the circumference by taking the circle center of the first circular patch (6) in the upper-layer dielectric substrate (2) as the circle center.
7. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folding structure as claimed in claim 6, wherein: the third metallized through holes (11) and the metal arms (14) are uniformly distributed along the circumference by taking the circle center of the second circular patch (3) in the lower-layer dielectric substrate (4) as the circle center.
8. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folded structure as claimed in claim 7, wherein: the circle centers of the first non-metalized via hole (16) in the upper-layer dielectric substrate (2) and the first circular patch (6) are superposed.
9. The low-profile dual-band common-aperture monopole antenna based on a cross-layer folded structure as claimed in claim 8, wherein: the circle centers of the second non-metallized through holes (7) in the lower dielectric substrate (4) and the second circular patch (3) are superposed.
10. The low-profile dual-band common-aperture monopole antenna based on the cross-layer folding structure as claimed in any one of claims 1 to 9, wherein: the upper dielectric substrate (2) and the lower dielectric substrate (4) are aligned and fixed in relative positions through plastic screws (8).
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| CN116914446A (en) * | 2023-08-08 | 2023-10-20 | 南通至晟微电子技术有限公司 | High-frequency ratio dual-beam common-caliber antenna |
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| CN113097704B (en) | 2022-06-14 |
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