CN111224225A - Compact double dipole driver and quasi-yagi antenna using same - Google Patents
Compact double dipole driver and quasi-yagi antenna using same Download PDFInfo
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- CN111224225A CN111224225A CN202010017081.1A CN202010017081A CN111224225A CN 111224225 A CN111224225 A CN 111224225A CN 202010017081 A CN202010017081 A CN 202010017081A CN 111224225 A CN111224225 A CN 111224225A
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- cylindrical dielectric
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- 239000000758 substrate Substances 0.000 claims abstract description 37
- 239000002184 metal Substances 0.000 claims description 15
- 230000009977 dual effect Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- 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
- H01Q19/28—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 a secondary device in the form of two or more substantially straight conductive elements
- H01Q19/30—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 a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
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Abstract
The invention discloses a compact double-dipole driver, which relates to the field of communication and comprises a cylindrical dielectric resonator, an open resonant ring and a dielectric substrate, wherein the dielectric substrate is positioned between the cylindrical dielectric resonator and the open resonant ring, the cylindrical dielectric resonator is positioned above the dielectric substrate, and the cylindrical dielectric resonator and the open resonant ring are arranged oppositely. The invention also discloses a quasi-yagi antenna applying the compact double-dipole driver, which comprises a cylindrical dielectric resonator, an open resonance ring, a dielectric substrate, a coplanar stripline and a concave ground plane, wherein the coplanar stripline is printed on the top surface of the dielectric substrate, the open resonance ring is arranged on the bottom surface of the dielectric substrate, and the concave ground plane is arranged on the bottom surface of the dielectric substrate. The invention has the advantages that: due to the fact that the working frequencies of the two dipoles are close to each other, the bandwidth of the antenna is improved. And a stable high gain is obtained in the operational wide band of the antenna.
Description
Technical Field
The invention relates to the field of communication antennas, in particular to a compact double-dipole driver and a quasi-yagi antenna applying the same.
Background
In the prior art, with the rapid development of modern communication systems, the quasi-yagi antenna has attracted much attention as an endfire antenna due to its advantages of simple structure, light weight, easy formation of array, etc. In the prior art, a plurality of modes are adopted to improve the performance of the device, and the device mainly focuses on two aspects: bandwidth broadening and gain improvement. In conventional quasi-yagi antenna designs, the most common driver is a λ with a different shape0/2 electric dipole, wherein0Is the wavelength in free space. In order to extend the operating bandwidth, there are feed baluns with different structures in the prior art. However, due to the limited radiation bandwidth of the driver, the gain of the antenna fluctuates considerably and the end-fire gain in the low frequency range of the operating band is only about 4dBi or even lower. In order to solve this problem, in the prior art, a plurality of dipoles with different lengths are used for series feeding, so as to obtain a wider bandwidth and a stable medium gain, but this causes a significant increase in longitudinal length and causes difficulties in the introduction and design of the directors, so that it is difficult to further improve the gain. There is also a microstrip patch magnetic dipole in the prior art that can enhance the bandwidth and simultaneously increase the gain by combining the fundamental TE110 mode and the higher order TE310 mode. However, this method results in a considerable increase in the transverse dimensions of the antenna, even if the width of the driver itself is greater than 1.5 λ0。
Disclosure of Invention
The invention provides a compact double-dipole driver and a quasi-yagi antenna applying the same, aiming at solving the technical problems of how to enable the compact double-dipole driver to obtain stable high gain in the working broadband of the antenna and how to widen the bandwidth.
In order to solve the technical problems, the technical scheme of the invention is as follows: a compact double-dipole driver comprises a cylindrical dielectric resonator, an open resonant ring and a dielectric substrate, wherein the dielectric substrate is located between the cylindrical dielectric resonator and the open resonant ring, the cylindrical dielectric resonator is located above the dielectric substrate, and the cylindrical dielectric resonator and the open resonant ring are arranged in a right-to-right mode.
Further, the radius of the body of the cylindrical dielectric resonator is 4.25mm, and the radius of the split resonant ring is 5.3 mm.
Further, the width of the split ring resonator is 0.3 mm.
Furthermore, two metal strips which are symmetrically arranged are arranged on the body of the cylindrical dielectric resonator, the two metal strips are arranged in parallel, the width of the two metal strips on the body of the cylindrical dielectric resonator is 1.7mm, the width of the two metal strips outside the body of the cylindrical dielectric resonator is 0.9mm, and the distance between the two metal strips is 1.4 mm.
Further, the dielectric substrate is a dielectric substrate with a square cross section.
It is another object of the present invention to provide a quasi-yagi antenna using the compact dual dipole driver as described above, comprising a cylindrical dielectric resonator, a split resonant ring, a dielectric substrate, a coplanar stripline printed on a top surface of the dielectric substrate, a split resonant ring printed on a bottom surface of the dielectric substrate, and a concave ground plane printed on the bottom surface of the dielectric substrate.
Preferably, the concave ground plane is a planar reflector with a concave circular arc, and the depth of the concave circular arc of the concave ground plane is 8.4 mm.
Preferably, the distance between the concave arc bottom of the concave ground plane and the lower edge of the open resonant ring is 11.4 mm.
Preferably, the distance between the concave arc bottom of the concave ground plane and the common centers of the split resonant ring and the cylindrical dielectric resonator is 15.65 mm.
Preferably, the distance between the upper edge of the concave ground plane and the common centers of the split resonant ring and the cylindrical dielectric resonator is 7.25 mm.
By adopting the technical scheme, the driver consists of the magnetic dipole and the folded electric dipole, the two dipoles are respectively made of the cylindrical dielectric resonator and the split ring resonator, the annular dielectric resonator and the split ring resonator are respectively fixed at the top and the bottom of the substrate in an overlapping mode, and the working frequencies of the two dipoles are close to each other, so that the bandwidth of the antenna is improved. Meanwhile, because the two dipoles have similar radiation characteristics, stable high gain is obtained in the working broadband of the antenna.
Drawings
FIG. 1 is a schematic diagram of a compact dual dipole driver according to the present invention;
fig. 2 is a schematic perspective view of a quasi-yagi antenna according to the present invention;
fig. 3 is a cross-sectional view of a top structure of a quasi-yagi antenna of the present invention;
FIG. 4 shows DR in TE in the present invention01δMode frequency fdElectric field distribution and SRR at higher order mode frequency fsS of11And εr1The current profile of (a);
FIG. 5 shows DR in TE in the present invention01δMode frequency fdElectric field distribution and SRR at higher order mode frequency fsS of11And the current profile of the crack width s of the SRR;
FIG. 6 is S of the antenna11And a simulated value plot of gain;
FIG. 7 is a simulated radiation pattern at the electric and magnetic field plane for an antenna frequency of 9.22 GHz;
fig. 8 is a simulated radiation pattern at the electric and magnetic field plane for an antenna frequency of 10.1 GHz.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1, the present embodiment discloses a compact dual dipole driver, which includes a cylindrical dielectric resonator 1, a split ring resonator 2, and a dielectric substrate 3, where the dielectric substrate 3 is located between the cylindrical dielectric resonator 1 and the split ring resonator 2, the cylindrical dielectric resonator 1 is located above the dielectric substrate 3, and the cylindrical dielectric resonator 1 and the split ring resonator 2 are disposed opposite to each other.
Preferably, the radius of the body of the cylindrical dielectric resonator 1 is 4.25mm, the cylindrical dielectric resonator is cylindrical, and the radius of the split resonant ring 2 is 5.3 mm. And the width of the split ring 2 is 0.3 mm. The parameter of the cylindrical dielectric resonator 1 is epsilonr1＝38，t＝1.0mm，tanδ1＝0.00015。
Preferably, the two metal strips 11 and 12 symmetrically arranged are arranged on the body of the cylindrical dielectric resonator 1, the two metal strips 11 and 12 are arranged in parallel, the width of the two metal strips 11 and 12 on the body of the cylindrical dielectric resonator 1 is 1.7mm, the width of the two metal strips 11 and 12 outside the body of the cylindrical dielectric resonator 1 is 0.9mm, and the distance between the two metal strips 11 and 12 is 1.4 mm. Preferably, the dielectric substrate 3 is a dielectric substrate 3 having a square cross section. The parameter of the substrate is epsilonr1＝3.55，h＝20mil，tanδ1＝0.0027。
Because the driver is composed of a magnetic dipole and a folded electric dipole, the two dipoles are respectively made of a cylindrical dielectric resonator and an open resonant ring, and the working frequencies of the two dipoles are close to each other, the bandwidth of the antenna is improved. Meanwhile, because the two dipoles have similar radiation characteristics, stable high gain is obtained in the working broadband of the antenna.
Example 2
Referring to fig. 2 and 3, the present embodiment discloses a quasi-yagi antenna to which the compact dual dipole driver as in embodiment 1 is applied, including a cylindrical dielectric resonator 1, a split resonant ring 2, a dielectric substrate 3, a coplanar stripline 4 and a concave ground plane 5, the coplanar stripline 4 being printed on the top surface of the dielectric substrate 3, the split resonant ring 2 being disposed on the bottom surface of the dielectric substrate 3, and the concave ground plane 5 being disposed on the bottom surface of the dielectric substrate 3.
Preferably, the concave ground plane 5 is a planar reflector with a concave arc, and the concave arc depth of the concave ground plane 5 is 8.4 mm.
Preferably, the distance between the concave arc bottom of the concave ground plane 5 and the lower edge of the split resonant ring 2 is 11.4 mm.
Preferably, the distance between the concave arc bottom of the concave ground plane 5 and the concentric centers of the split ring resonator 2 and the cylindrical dielectric resonator 1 is 15.65 mm.
Preferably, the distance between the upper edge of the concave ground plane 5 and the concentric centers of the split resonant ring 2 and the cylindrical dielectric resonator 1 is 7.25 mm.
Preferably, the coplanar striplines 4 are printed on top of the substrate as balanced transmission lines, serving as feed lines. In addition, the concave ground plane 5 is used as a reflector.
The performance of the antenna in the above embodiment is simulated in the following with reference to fig. 4-8.
The dominant mode of the cylindrical dielectric resonator is TE01δMode with resonant frequency mainly determined by parameter ε of DRr1T and r1And (4) determining. The electric field is distributed in a circular ring and tangent to the x-z plane as shown in fig. 4 and 5. Thus, TE01δThe modes can be excited by coplanar striplines and act as magnetic dipoles (J) along the y-axism-nxe) is performed. At the same time, the bottom SRR surrounds and is directly below the cylindrical DR, constituting a double dipole driver, substantially increasing in size. This design takes advantage of SRR operating in higher order modes and is also shown in figures 4 and 5 at higher order mode frequency fsCurrent distribution at the lower SRR. From the observation, the SRR can be seen as a folded electric dipole, with the polarization direction along the x-axis. It was confirmed that the above arrangement combined with the structure of embodiment 1 has constructed a compact double dipole driver. According to the electric field and current distribution in fig. 4 and 5, the two dipoles have similar radiationAnd may be reflected by the concave surface to achieve end-fire radiation. Thus, the two euro-machines of the driver disclosed in embodiment 1 have similar radiation characteristics and can be reflected by the concave surface to achieve end-fire radiation.
Fig. 4 and 5 show the simulated reflection coefficient S11 of the designed antenna. It can be known that TE of DR01δThe model produces a lower resonant frequency, while the SRR produces a higher resonant frequency. As shown in the figure, with er1Lower frequencies move downward, while higher frequencies decrease with a slight increase in the effective dielectric constant of the SRR; when the slot width s of the SRR is reduced, i.e. the length of the SRR is reduced, the higher frequency is increased substantially, while the lower frequency remains unchanged. The antenna gain remains stable within the operating band due to the double dipole radiation.
FIG. 6 shows S of the designed antenna11And simulated values of gain, where the dotted line is S11And the solid line is the gain. Simulation is at S11<The impedance bandwidth at-10 dB is 1.1GHz (11.43%). Fig. 7-8 depict simulated radiation patterns in the plane of the electric and magnetic fields at frequencies of 9.22 and 10.1GHz, respectively. The front-to-back ratio is always greater than 10 dB. The double dipole driver occupies only pi r2＝0.1λ0 2Wherein the solid line represents the main polarization and the dashed line represents the cross polarization. Therefore, the antenna designed in embodiment 2 described above has a wide bandwidth, and the antenna obtains a stable high gain over its operating wide frequency band.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A compact dual dipole driver, characterized by: the dielectric resonator comprises a cylindrical dielectric resonator (1), an open resonant ring (2) and a dielectric substrate (3), wherein the dielectric substrate (3) is positioned between the cylindrical dielectric resonator (1) and the open resonant ring (2), the cylindrical dielectric resonator (1) is positioned above the dielectric substrate (3), and the cylindrical dielectric resonator (1) and the open resonant ring (2) are arranged just opposite to each other.
2. A compact dual dipole driver according to claim 1, wherein: the radius of the body of the cylindrical dielectric resonator (1) is 4.25mm, and the radius of the split resonant ring (2) is 5.3 mm.
3. A compact dual dipole driver according to claim 1, wherein: the width of the split resonant ring (2) is 0.3 mm.
4. A compact dual dipole driver according to claim 1, wherein: the cylindrical dielectric resonator is characterized in that two metal strips (11, 12) are symmetrically arranged on a body of the cylindrical dielectric resonator (1), the two metal strips (11, 12) are arranged in parallel, the width of the two metal strips (11, 12) on the body of the cylindrical dielectric resonator (1) is 1.7mm, the width of the two metal strips (11, 12) outside the body of the cylindrical dielectric resonator (1) is 0.9mm, and the distance between the two metal strips (11, 12) is 1.4 mm.
5. A compact dual dipole driver according to claim 1, wherein: the dielectric substrate (3) is a dielectric substrate (3) with a square section.
6. A quasi-yagi antenna using the compact dual-dipole driver as claimed in any one of claims 1-5, wherein: the split-type coaxial dielectric resonator comprises a cylindrical dielectric resonator (1), an open resonant ring (2), a dielectric substrate (3), coplanar striplines (4) and a concave ground plane (5), wherein the coplanar striplines (4) are printed on the top surface of the dielectric substrate (3), the open resonant ring (2) is arranged on the bottom surface of the dielectric substrate (3), and the concave ground plane (5) is arranged on the bottom surface of the dielectric substrate (3).
7. The quasi-yagi antenna of claim 6, wherein: the concave ground plane (5) is a plane reflector with a concave circular arc, and the depth of the concave circular arc of the concave ground plane (5) is 8.4 mm.
8. The quasi-yagi antenna of claim 7, wherein: the distance between the concave arc bottom of the concave grounding plane (5) and the lower edge of the opening resonant ring (2) is 11.4 mm.
9. The quasi-yagi antenna of claim 8, wherein: the distance between the concave arc bottom of the concave ground plane (5) and the concentric centers of the split resonant ring (2) and the cylindrical dielectric resonator (1) is 15.65 mm.
10. The quasi-yagi antenna of claim 9, wherein: and the distance between the upper edge of the concave ground plane (5) and the concentric centers of the split resonant ring (2) and the cylindrical dielectric resonator (1) is 7.25 mm.
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| CN202010017081.1A CN111224225B (en) | 2020-01-08 | 2020-01-08 | Compact double dipole driver and quasi-yagi antenna using same |
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| CN202010017081.1A CN111224225B (en) | 2020-01-08 | 2020-01-08 | Compact double dipole driver and quasi-yagi antenna using same |
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