CN110829038A - Broadband quasi-yagi antenna based on dielectric resonator - Google Patents
Broadband quasi-yagi antenna based on dielectric resonator Download PDFInfo
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- CN110829038A CN110829038A CN201911178898.0A CN201911178898A CN110829038A CN 110829038 A CN110829038 A CN 110829038A CN 201911178898 A CN201911178898 A CN 201911178898A CN 110829038 A CN110829038 A CN 110829038A
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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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- 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
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
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Abstract
The invention discloses a broadband quasi-yagi antenna based on a dielectric resonator, and belongs to the technical field of antennas. The microwave dielectric substrate comprises a substrate, wherein the substrate comprises an upper layer and a lower layer which are formed by microwave dielectric substrates; the dielectric resonator is characterized by also comprising a reflector, a dielectric resonator, a top layer director, a bottom layer director, a differential microstrip pair and a coplanar strip line; the reflector is printed on the lower layer of the substrate; the dielectric resonator is adhered to the upper surface of the substrate; the differential microstrip pair and the coplanar strip line are printed on the upper layer of the substrate; the differential microstrip pair is connected with the coplanar strip line; the coplanar strip line is connected with a metal bonding pad on the dielectric resonator to excite two resonance modes of the dielectric resonator, and the two resonance modes provide two resonance points of the antenna; the top layer director is printed on the upper layer of the substrate; the bottom layer director is printed on the lower layer of the substrate; the top layer director and the bottom layer director partially overlap; two resonance points of the dielectric resonator and the additional two resonance points provided by the bottom layer director and the top layer director form a broadband response of the antenna.
Description
Technical Field
The invention particularly relates to a broadband quasi-yagi antenna based on a dielectric resonator, and belongs to the technical field of antennas.
Background
With the development of wireless systems, endfire antennas have received a great deal of attention due to their particular application, such as point-to-point communication systems and radar imaging systems. To date, various types of endfire antennas have been researched and developed worldwide, including log periodic antennas, horn antennas, surface wave antennas, and quasi-yagi antennas. Log periodic antennas have an ultra wide bandwidth for endfire radiation, but their endfire gain is limited due to the partial radiation characteristics. The traditional metal horn antenna has high gain and large bandwidth, but has large volume and heavy weight. In order to reduce the weight of the feedhorn, researchers have proposed substrate-integrated waveguide feedhorns. However, since the open end of the substrate-integrated horn antenna is too thin, its operating band is narrow. The vivaldi antenna also has a broadband characteristic, but the cross polarization and side lobes deteriorate rapidly with increasing operating frequency. The quasi-yagi antenna is a typical parasitic element antenna, has the advantages of simple structure, light weight, good directivity, easy array formation and the like, and has strong attraction. With the development of modern wireless communication systems, low-frequency spectrum resources are gradually lacking, high-frequency spectrum has abundant spectrum resources, an antenna is used as a transmitting and receiving end of the wireless communication system, and the working frequency is higher. Conventional antennas using metal strips as radiating elements are limited by the skin effect and suffer more losses at high frequency operation. Since there is no surface current in the dielectric resonator, the loss of the antenna using the dielectric resonator as the radiating element at high frequencies is relatively small. In the existing yagi antenna based on the dielectric resonator, only one main mode of a radiation unit formed by the dielectric resonator is excited, so that the working bandwidth is narrow, and the requirements of broadband and multi-frequency working in a modern wireless communication system cannot be met. Quasi-yagi antennas based on dielectric resonators with broadband response are therefore highly desirable in modern wireless communication systems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the broadband quasi-yagi antenna based on the dielectric resonator, which has high gain and stable gain in a pass band.
In order to achieve the purpose, the invention adopts the following technical scheme:
a broadband quasi-yagi antenna based on a dielectric resonator comprises a substrate, wherein the substrate comprises an upper layer and a lower layer which are formed by microwave dielectric substrates; the dielectric resonator is characterized by also comprising a reflector, a dielectric resonator, a top layer director, a bottom layer director, a differential microstrip pair and a coplanar strip line; the reflector is printed on the lower layer of the substrate; the dielectric resonator is adhered to the upper surface of the substrate; the differential microstrip pair and the coplanar strip line are printed on the upper layer of the substrate; the differential microstrip pair is connected with the coplanar strip line; the coplanar strip line is connected with a metal bonding pad on the dielectric resonator to excite two resonance modes of the dielectric resonator; the two resonant modes provide two resonance points of the antenna; the top layer director is printed on the upper layer of the substrate; the bottom layer director is printed on the lower layer of the substrate; the top layer director and the bottom layer director partially overlap; and two resonance points of the dielectric resonator, an additional resonance point introduced by the bottom layer director and an additional resonance point introduced by the top layer director form an antenna broadband response.
Further, as a preferred technical solution of the present invention, the length a of the dielectric resonator is about one third of the air wavelength corresponding to the center frequency of the antenna; a distance L between the dielectric resonator and the reflector1Approximately one quarter of the air wavelength corresponding to the center frequency of the antenna.
Further, as a preferred technical solution of the present invention, a ratio a/b of the length a to the width b of the dielectric resonator is larger than 2, so as to obtain two resonant modes with close resonant frequencies.
Further, as a preferable technical scheme of the invention, the dielectric resonator is a rectangular dielectric resonator and is made of a ceramic material with a relative dielectric constant greater than 45.
Further, as a preferred technical solution of the present invention, the length of the top layer director and the length of the bottom layer director are both slightly shorter than the length a of the dielectric resonator.
Further, according to a preferred embodiment of the present invention, the relative dielectric constant of the substrate is less than 10.
Further, as a preferred technical solution of the present invention, the reflector is a metal ground; the metal ground acts as a reflector for the antenna and also as a ground for the differential microstrip pair.
Further, as a preferred technical scheme of the invention, the center frequency of the antenna is 10.45GHz, the relative bandwidth is more than 20%, namely the reflection coefficient is less than a part of minus 10 dB.
Compared with the prior art, the broadband quasi-yagi antenna based on the dielectric resonator has the following technical effects by adopting the technical scheme:
the invention forms a high-gain broadband yagi antenna with stable gain in the pass band by combining the respective resonant frequencies of the dielectric resonator and the two directors, and the two resonant points of the dielectric resonator and the resonant points of the two directors form a broadband response, thereby meeting the multi-frequency working requirement of modern wireless communication.
Drawings
FIG. 1 is a first schematic structural diagram of the present invention;
FIG. 2 is a second schematic structural view of the present invention;
FIG. 3 is a comparison graph of simulation and actual measurement of the E-plane of the present invention at a frequency of 9.48 GHz;
FIG. 4 is a comparison graph of simulation and actual measurement of the H-plane at 9.48GHz frequency according to the present invention;
FIG. 5 is a comparison graph of simulation and actual measurement of the E-plane at 10.34GHz frequency according to the invention;
FIG. 6 is a comparison graph of simulation and actual measurement of the H-plane at 10.34GHz frequency according to the present invention;
FIG. 7 is a comparison graph of simulation and actual measurement of the E-plane at a frequency of 11.42GHz in accordance with the present invention;
FIG. 8 is a comparison graph of simulation and actual measurement of the H-plane at 11.42GHz frequency according to the present invention;
FIG. 9 is a comparison graph of simulated and actual measurements of return loss and actual gain for the present invention;
in the figure, 1-the area where the dielectric resonator is located; 2-the area of the upper layer of the substrate; 3-the area of the lower layer of the substrate; 11-a reflector; 12-a dielectric resonator; 13-top layer director; 14-bottom layer director; 15-differential microstrip pair; 16-coplanar stripline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a broadband quasi-yagi antenna based on a dielectric resonator includes a substrate, wherein the substrate includes an upper layer and a lower layer formed by a microwave dielectric substrate; the dielectric resonator further comprises a reflector 11, a dielectric resonator 12, a top layer director 13, a bottom layer director 14, a differential microstrip pair 15 and a coplanar strip line 16; the reflector 11 is printed on the lower layer of the substrate; the dielectric resonator 12 is adhered to the upper surface of the substrate; the differential microstrip pair 15 and the coplanar strip line 16 are printed on the upper layer of the substrate; the differential microstrip pair 15 is connected with a coplanar strip line 16; the coplanar strip line 16 is connected with a metal pad of the dielectric resonator 12 to excite two resonance modes of the dielectric resonator 12; the two resonant modes provide two resonance points of the antenna; the top director 13 is printed on the upper layer of the substrate; the bottom director 14 is printed on the bottom layer of the substrate; the top layer director 13 and the bottom layer director 14 partly overlap; two resonance points of the dielectric resonator 12 constitute the broadband response of the antenna with the additional two resonance points provided by the bottom and top directors.
The substrate has a relative dielectric constant less than 10. Specifically, a Rogers 4003C substrate having a dielectric constant of 3.38 and a loss tangent of 0.0027 was used. The substrate comprises a region 1 where the dielectric resonator is located, a region 2 where the upper layer of the substrate is located, and a region 3 where the lower layer of the substrate is located. The reflector 11 is a metal ground; the metal ground acts as both the reflector 11 of the antenna and as the ground for the differential microstrip pair 15. In front of the dielectric resonator 12 there are two metal directors, a bottom director 14 and a top director 13. The differential microstrip pair 15 is connected with the coplanar strip line 16, differential signals on the differential microstrip pair 15 are converted into differential signals on the coplanar strip line 16, and the coplanar strip line 16 is connected with the metal bonding pad of the dielectric resonator 12 to excite two resonance modes of the dielectric resonator and provide two resonance points of the antenna. According to the broadband quasi-yagi antenna based on the dielectric resonator, the traditional metal driver is replaced by the dielectric resonator 12, the two directors are printed on the upper layer and the lower layer of the substrate at the same time, the directors are closer to the dielectric resonator 12, the mode of the directors can be excited by the dielectric resonator 12, and the directors on the upper layer and the lower layer can respectively provide two resonance points. The two resonance points of the dielectric resonator 12 and the resonance points of the two directors constitute one broadband response.
The center frequency of the antenna being f0Air wavelength λ ═ cf0(c is 3X 108 m/s). The length a of the dielectric resonator 12 is about one third of the air wavelength corresponding to the center frequency of the antenna; distance l between dielectric resonator 12 and reflector 111Approximately one quarter of the air wavelength corresponding to the center frequency of the antenna. The length of the top layer director 13 and the length of the bottom layer director 14 are both slightly shorter than the length a of the dielectric resonator 12. The dielectric resonator 12 is a rectangular dielectric resonator and is made of a ceramic material having a relative dielectric constant greater than 45. The antenna impedance matching can be achieved by adjusting the width w of the wideband portion of the coplanar stripline 162And length l2To be implemented.
The ratio a/b of the length a to the width b of the dielectric resonator 12 is larger than 2 to obtain two resonance modes with close resonance frequencies. So that the frequencies of the two resonance points of the dielectric resonator 12 can be brought closer.
In specific implementation, the relative dielectric constant of the dielectric resonator 12 is 69, the length a of the dielectric resonator 12 is 11.5mm, the width b of the dielectric resonator 12 is 3.3mm, the thickness c of the dielectric resonator 12 is 1mm, and the distance l between the dielectric resonator 12 and the reflector 11 is as follows18mm, coplanar strip line 16 wide strip length l26mm, length dl of the top layer director 1327.8mm, width dw of the top layer director 1324mm, the distance g between the top director 13 and the near director end of the dielectric resonator 1233mm, length dl of the bottom layer director 1417.8mm, width dw of the bottom director 1412.8mm, the distance g between the bottom director 14 and the near director end of the dielectric resonator 1223.5mm, differential microstrip pair15 two microstrip line spacing g11.5mm, coplanar stripline 16 narrow strip width w1Is 1mm, and the width w of the coplanar strip line is 1621.6mm, width w of the metal pad on the dielectric resonator 123Is equal to w1The height of the metal pad on the dielectric resonator 12 is equal to c, the length sl of the substrate is 34mm, and the width sw of the substrate is 30 mm.
The broadband quasi-yagi antenna based on the dielectric resonator of the present invention was simulated and measured using software HFSS and agilent E5230C network analyzer and microwave darkroom, and the measurement results are shown in fig. 3 to 9, it can be seen that the central frequency of the broadband quasi-yagi antenna based on the dielectric resonator of the present invention is 10.45GHz, and the relative bandwidth FBW is more than 20%. The specific relative bandwidth FBW is 21.7%, namely the reflection coefficient is smaller than a part of minus 10dB, and the maximum values of the cross polarization level on the E surface and the H surface are respectively minus 18dB and minus 17dB, so that the broadband quasi-yagi antenna based on the dielectric resonator has a wide bandwidth and good radiation performance.
Compared with the traditional metal quasi-yagi antenna, the broadband quasi-yagi antenna based on the dielectric resonator can obtain wider bandwidth and higher gain.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art should understand that equivalent changes and modifications made without departing from the concept and principle of the present invention should fall within the protection scope of the present invention.
Claims (8)
1. A broadband quasi-yagi antenna based on a dielectric resonator comprises a substrate, wherein the substrate comprises an upper layer and a lower layer which are formed by microwave dielectric substrates; the dielectric resonator is characterized by further comprising a reflector (11), a dielectric resonator (12), a top layer director (13), a bottom layer director (14), a differential microstrip pair (15) and a coplanar strip line (16); the reflector (11) is printed on the lower layer of the substrate; the dielectric resonator (12) is adhered to the upper surface of the substrate; the differential microstrip pair (15) and the coplanar strip line (16) are printed on the upper layer of the substrate; the differential microstrip pair (15) is connected with a coplanar strip line (16); the coplanar strip line (16) is connected with a metal pad on the dielectric resonator (12) to excite two resonance modes of the dielectric resonator (12); the two resonant modes provide two resonance points of the antenna; the top layer director (13) is printed on the upper layer of the substrate; the bottom layer director (14) is printed on the lower layer of the substrate; the top layer director (13) and the bottom layer director (14) partially overlap; two resonance points of the dielectric resonator (12) and an additional resonance point introduced by the bottom layer director (14) and an additional resonance point introduced by the top layer director (13) form an antenna broadband response.
2. The dielectric resonator-based wideband quasi-yagi antenna as claimed in claim 1, wherein the length a of the dielectric resonator (12) is approximately one third of the air wavelength corresponding to the antenna center frequency; the distance l between the dielectric resonator (12) and the reflector (11)1Approximately one quarter of the air wavelength corresponding to the center frequency of the antenna.
3. The dielectric resonator-based wideband quasi-yagi antenna as claimed in claim 1, wherein the ratio a/b of the length a to the width b of the dielectric resonator (12) is greater than 2 to obtain two resonant modes with close resonant frequencies.
4. The dielectric resonator-based wideband quasi-yagi antenna as claimed in claim 1, wherein the dielectric resonator (12) is a rectangular dielectric resonator made of ceramic material having a relative dielectric constant greater than 45.
5. The dielectric resonator-based wideband quasi-yagi antenna as claimed in claim 1, wherein the length of the top layer director (13) and the length of the bottom layer director (14) are both slightly shorter than the length a of the dielectric resonator (12).
6. The dielectric resonator-based wideband quasi-yagi antenna of claim 1 wherein the substrate has a relative permittivity less than 10.
7. The dielectric resonator-based broadband quasi-yagi antenna of claim 1, wherein the reflector (11) is a metal ground; the metal ground acts as a reflector (11) for the antenna and also as a ground for the differential microstrip pair (15).
8. The dielectric resonator-based wideband quasi-yagi antenna as claimed in any of claims 1-7, wherein the antenna has a center frequency of 10.45GHz and a relative bandwidth of greater than 20%, i.e. a reflection coefficient of less than the-10 dB part.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809531A (en) * | 2021-09-01 | 2021-12-17 | 南通大学 | Pattern reconfigurable antenna based on switchable director |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809531A (en) * | 2021-09-01 | 2021-12-17 | 南通大学 | Pattern reconfigurable antenna based on switchable director |
| CN113809531B (en) * | 2021-09-01 | 2023-08-01 | 南通大学 | Directional diagram reconfigurable antenna based on switchable director |
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Effective date of registration: 20220722 Address after: No.18 Zilang Road, Nantong City, Jiangsu Province, 226004 Patentee after: NANTONG SANPULILAN ELECTRIC APPLIANCE INDUSTRIAL CO.,LTD. Address before: 226019 Jiangsu Province, Nantong City Chongchuan District sik Road No. 9 Patentee before: NANTONG University |