CN111224225B - 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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- CN111224225B CN111224225B CN202010017081.1A CN202010017081A CN111224225B CN 111224225 B CN111224225 B CN 111224225B CN 202010017081 A CN202010017081 A CN 202010017081A CN 111224225 B CN111224225 B CN 111224225B
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- dielectric resonator
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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
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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
- H01Q19/28—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 wide operating 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, a quasi-yagi antenna has attracted much attention as an end-fire antenna due to its advantages of simple structure, light weight, easy formation of an array, and the like. 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 widening and gain improvement. In conventional quasi-yagi antenna designs, the most common driver is a λ having a different shape 0 /2 electric dipole, wherein λ 0 Is the wavelength in free space. To expandWith a large 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 λ 0 。
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 ensure that the compact double-dipole driver obtains 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 ring resonator is 5.3mm.
Further, the width of the split ring resonator is 0.3mm.
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 1.4mm.
Furthermore, the dielectric substrate is a dielectric substrate with a square 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 8.4mm.
Preferably, the distance between the concave arc bottom of the concave ground plane and the lower edge of the open resonant ring is 11.4mm.
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 15.65mm.
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 7.25mm.
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 actuator 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 sectional view of the top structure of a quasi-yagi antenna according to the present invention;
FIG. 4 shows DR in TE in the present invention 01δ Mode frequency f d Electric field distribution and SRR at higher order mode frequency f s S of 11 And ε r1 The current profile of (a);
FIG. 5 shows DR in TE in the present invention 01δ Mode frequency f d Electric field distribution and SRR at higher order mode frequency f s S of 11 And the current profile of the crack width s of the SRR;
FIG. 6 is S of the antenna 11 And 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 description of the embodiments of the present invention will be made with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and is not intended to limit the present invention. 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 5.3mm. And the width of the split ring 2 is 0.3mm. The parameter of the cylindrical dielectric resonator 1 is epsilon r1 ＝38，t＝1.0mm，tanδ 1 ＝0.00015。
Preferably, the cylindrical dielectric resonator 1 is provided on the body thereofThe two metal strips 11 and 12 are symmetrically arranged, the two metal strips 11 and 12 are arranged in parallel, the width of the two metal strips 11 and 12 on the cylindrical dielectric resonator 1 body is 1.7mm, the width of the two metal strips 11 and 12 outside the cylindrical dielectric resonator 1 body is 0.9mm, and the distance between the two metal strips 11 and 12 is 1.4mm. Preferably, the dielectric substrate 3 is a dielectric substrate 3 having a square cross section. The parameter of the substrate is epsilon r1 ＝3.55，h＝20mil，tanδ 1 ＝0.0027。
Because the driver is composed of a magnetic dipole and a folded electric dipole, the two dipoles are respectively made of the cylindrical dielectric resonator and the split 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 wide operating band of the antenna.
Example 2
Referring to fig. 2 and 3, the present embodiment discloses a quasi-yagi antenna to which the compact double dipole driver as in embodiment 1 is applied, comprising 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 disposed on the top surface of the dielectric substrate 3 by printing, 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 8.4mm.
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 11.4mm.
Preferably, the distance between the concave arc bottom of the concave ground plane 5 and the concentric centers of the split ring 2 and the cylindrical dielectric resonator 1 is 15.65mm.
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 7.25mm.
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 below with reference to fig. 4-8.
The dominant mode of the cylindrical dielectric resonator is TE 01δ Mode with resonant frequency mainly determined by parameter ε of DR r1 T and r 1 And (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, TE 01δ The modes can be excited by coplanar striplines and act as magnetic dipoles (J) along the y-axis m = -n × E) radiation. 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 makes use of SRRs operating in higher order modes and is also shown in figures 4 and 5 at higher order mode frequencies f s Current 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 radiation characteristics and can be reflected by the concave surface to achieve end-fire radiation. Thus, the two euros of the driver disclosed in embodiment 1 have similar radiation characteristics and can be reflected concavely to achieve end-fire radiation.
Fig. 4 and 5 show the simulated reflection coefficient S11 of the designed antenna. It can be seen that TE of DR 01δ The model produces a lower resonant frequency, while the SRR produces a higher resonant frequency. As shown in the figure, with e r1 Lower frequencies move downward, while higher frequencies decrease with a slight increase in the effective dielectric constant of the SRR; when the slit width s of the SRR is reduced, i.e. the length of the SRR is reduced, the higher frequency is greatly increased, while the lower frequency is kept unchanged. Due to the double dipole radiation, the antenna gain remains stable within the operating band.
FIG. 6 shows S of the designed antenna 11 And simulated values of gain, where the dotted line is S 11 And the solid line is the gain. Simulation at S 11 <-10dB ConditionThe impedance bandwidth at the lower 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 10dB. The double dipole driver occupies only pi r 2 ＝0.1λ 0 2 Wherein 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 stably high gain over its wide operating band.
The embodiments of the present invention have been described in detail above 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 the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.
Claims (9)
1. A compact dual dipole driver, characterized by: the 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 oppositely; the cylindrical dielectric resonator is characterized in that two metal strips (11, 12) which are symmetrically arranged are arranged on the body of the cylindrical dielectric resonator (1), the two metal strips (11, 12) are arranged in parallel, the width of each metal strip (11, 12) on the body of the cylindrical dielectric resonator (1) is 1.7mm, the width of each metal strip (11, 12) on the body of the cylindrical dielectric resonator (1) is 0.9mm, and the distance between the two metal strips (11, 12) is 1.4mm.
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 5.3mm.
3. A compact dual dipole driver according to claim 1, wherein: the width of the split resonant ring (2) is 0.3mm.
4. A compact dual dipole driver according to claim 1, wherein: the dielectric substrate (3) is a dielectric substrate (3) with a square section.
5. A quasi-yagi antenna using the compact dual-dipole driver as claimed in any one of claims 1-4, wherein: the split-type coaxial dielectric resonator comprises a cylindrical dielectric resonator (1), an open resonant ring (2), a dielectric substrate (3), a coplanar strip line (4) and a concave grounding plane (5), wherein the coplanar strip line (4) is 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 grounding plane (5) is arranged on the bottom surface of the dielectric substrate (3).
6. The quasi-yagi antenna of claim 5, 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 8.4mm.
7. The quasi-yagi antenna of claim 6, wherein: and the distance between the concave arc bottom of the concave grounding plane (5) and the lower edge of the opening resonant ring (2) is 11.4mm.
8. The quasi-yagi antenna of claim 7, wherein: and the distance between the concave arc bottom of the concave grounding plane (5) and the common circular center of the split resonant ring (2) and the cylindrical dielectric resonator (1) is 15.65mm.
9. The quasi-yagi antenna of claim 8, wherein: and the distance between the upper edge of the concave grounding plane (5) and the concentric centers of the split resonant ring (2) and the cylindrical dielectric resonator (1) is 7.25mm.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN201904438U (en) * | 2011-01-06 | 2011-07-20 | 西北工业大学 | Microstrip antenna based on cladding of ferroelectric dielectric resonator |
| KR101345764B1 (en) * | 2012-08-21 | 2014-01-03 | 경북대학교 산학협력단 | Quasi yagi antenna |
| WO2016069014A1 (en) * | 2014-10-31 | 2016-05-06 | The American University In Cairo | Dielectric resonator antenna |
| US9793611B2 (en) * | 2015-08-03 | 2017-10-17 | City University Of Hong Kong | Antenna |
| CN105071052B (en) * | 2015-08-19 | 2017-11-17 | 南京邮电大学 | A kind of planar complementary oscillator circular polarized antenna |
| CN106067596A (en) * | 2016-05-23 | 2016-11-02 | 重庆邮电大学 | Miniaturization broadband medium resonator antenna based on coplanar wave guide feedback |
| CN106229682A (en) * | 2016-10-12 | 2016-12-14 | 哈尔滨工业大学 | A kind of double frequency directional diagram reconstructable dielectric resonator antenna |
| CN206712018U (en) * | 2017-04-21 | 2017-12-05 | 天津中德应用技术大学 | Miniaturization broadband diectric antenna applied to 5G GSMs |
| CN107666037A (en) * | 2017-08-23 | 2018-02-06 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | A kind of double frequency high-gain Yagi antenna |
| CN109546354B (en) * | 2018-12-24 | 2021-04-16 | 南通大学 | Magnetic dipole yagi antenna based on dielectric resonator |
| CN109861006A (en) * | 2019-01-24 | 2019-06-07 | 南京信息工程大学 | A kind of multi-drive broad sense yagi aerial and its optimization method |
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