CN106785466B - Three-frequency filtering antenna with high frequency selectivity - Google Patents
Three-frequency filtering antenna with high frequency selectivity Download PDFInfo
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- CN106785466B CN106785466B CN201611233527.4A CN201611233527A CN106785466B CN 106785466 B CN106785466 B CN 106785466B CN 201611233527 A CN201611233527 A CN 201611233527A CN 106785466 B CN106785466 B CN 106785466B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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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
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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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
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Abstract
The invention discloses a three-frequency filtering antenna with high frequency selectivity, which comprises a dielectric plate, wherein a floor layer is printed on the bottom surface of the dielectric plate, two split resonant rings, a monopole antenna, a feeder line and a microstrip line are printed on the top surface of the dielectric plate, the two split resonant rings are bilaterally symmetrical, the openings of the two split resonant rings are oppositely arranged, a gap is reserved between the two split resonant rings, and two mutually perpendicular branches are loaded in each split resonant ring; one split resonant ring is connected with a feeder line, the other split resonant ring is connected with a monopole antenna through a microstrip line, and a branch is loaded in the monopole antenna. The three-frequency filter antenna has high selectivity, and can work at 2.4/5.2/6.4GHz by combining the filter structure with the monopole antenna.
Description
Technical Field
The invention relates to a filtering antenna, in particular to a three-frequency filtering antenna with high frequency selectivity, and belongs to the technical field of wireless mobile communication.
Background
During the last decades, antennas and filters have been studied and designed as separate components and then connected by 50 Ω transmission lines, however, such direct connection often results in increased system losses and also takes up a larger system space. Therefore, such a design method has failed to meet the demand of modern wireless communication systems for miniaturization and low loss.
In recent years, more and more scholars have proposed the concept of filtering antennas, that is, integrating a filter and an antenna into the same device, so that the filter and the antenna have both a filtering characteristic and a radiation characteristic, and at the same time, the size of the system is reduced, the complexity of the system is reduced, and the system is more efficient.
Filter antenna design is a key technology for modern wireless communication systems. In the design of the filter antenna, the antenna not only acts as a radiating element, but also is regarded as the last-order resonator in the filter design, so that the antenna has good design efficiency and good edge selectivity without additional system size, which is often reflected on a gain curve, and compared with the traditional antenna design, the rectangular degree of the gain is much better, and the out-of-band rejection is good.
The current design method of the filter antenna comprises the following steps: slot coupling, probe coupling, microstrip line coupling, etc., patch antennas and monopole antennas are often used in the design of filter antennas.
The presently disclosed prior art is investigated and understood as follows:
1) In 2011, chao-Tang Chuang and Sheh-Jong Chung were earlier studied on filter antennas in the paper "IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION" publication entitled "Synthesis and Design of a New Printed Filtering Antenna". The article adopts the traditional parallel coupling line filter structure, on the basis, an inverted L-shaped antenna is added at the tail end of the filter, so that good gain rectangle degree is realized, and the center frequency is 2.45GHz.
2) In 2011, wei-Jun Wu, ying-Zeng Yin, shao-Li Zuo, zhi-Ya Zhang, and Jiao-Jiao Xie et al in the publication "IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS" entitled "A New Compact Filter-Antenna for Modern Wireless Communication Systems" propose a method of integrating two split resonant loops and a Γ -shaped antenna into one structure to form a filtered antenna. The gamma-shaped antenna not only plays a role in radiation, but also replaces the last-order resonator of the original split-band resonator loop-pass filter, so that better edge selectivity, flatter antenna gain and higher out-of-band rejection are realized.
3) In 2015, zheng Qiang proposed a dual-frequency filtering antenna with a simple structure in the article "2015 8th International Symposium on Computational Intelligence and Design" published under "Simple Structure High Selectivity Dual-Band Filtering Antenna", and the structure makes it generate two operation modes by loading a branch on one side of a U-shaped resonator and an inverted-L antenna, and the operation frequency band is 2.4/3.5GHz.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the three-frequency filter antenna with high frequency selectivity, and the filter antenna has the advantages of simple structure, convenient processing, small volume and low cost.
The aim of the invention can be achieved by adopting the following technical scheme:
the three-frequency filter antenna with the high frequency selectivity comprises a dielectric plate, wherein a floor layer is printed on the bottom surface of the dielectric plate, two split resonant rings, a monopole antenna, a feeder line and a microstrip line are printed on the top surface of the dielectric plate, the two split resonant rings are bilaterally symmetrical, openings of the two split resonant rings are oppositely arranged, a gap is reserved between the two split resonant rings, and two mutually perpendicular branches are loaded in each split resonant ring; one split resonant ring is connected with a feeder line, the other split resonant ring is connected with a monopole antenna through a microstrip line, and a branch is loaded in the monopole antenna.
As one embodiment, the two split-resonance rings are a first split-resonance ring and a second split-resonance ring, respectively, and the first split-resonance ring and the second split-resonance ring are rectangular split-rings; the opening of the first split-ring resonator and the opening of the second split-ring resonator are respectively a first opening and a second opening; the two loaded branches in the first open resonance ring are a first branch and a second branch respectively, and the two loaded branches in the second open resonance ring are a third branch and a fourth branch respectively; the first branch is vertically loaded on the edge of the first opening resonance ring opposite to the edge where the first opening is, the second branch is vertically loaded on the edge of the first opening resonance ring adjacent to the edge where the first opening is, the third branch is vertically loaded on the edge of the second opening resonance ring opposite to the edge where the second opening is, and the fourth branch is vertically loaded on the edge of the second opening resonance ring adjacent to the edge where the second opening is.
As an implementation scheme, the first branch, the second branch, the edge adjacent to the edge where the first opening is located and the edge opposite to the edge where the first opening is located enclose a small ring inside the first opening resonance ring, the third branch, the fourth branch, the edge adjacent to the edge where the second opening is located and the edge opposite to the edge where the second opening is located enclose a small ring inside the second opening resonance ring, and the small ring inside the first opening resonance ring and the small ring inside the second opening resonance ring are rotationally symmetrical.
As one embodiment, the monopole antenna is a rectangular annular monopole antenna, and the loaded branch inside the monopole antenna is a fifth branch, and the fifth branch is vertically loaded on one side of the monopole antenna.
As one implementation mode, one end of the feeder line is connected with one side of the first opening resonance ring except the side where the first opening is located, and the other end of the feeder line is contacted with one side of the dielectric plate; one end of the microstrip line is connected with one of the edges of the second split resonant ring except the edge where the second split is located, and the other end of the microstrip line is connected with the left side of the monopole antenna.
As one embodiment, the distance between the upper and lower edges of the floor layer is the width of the floor layer, the distance between the left and right edges is the length of the floor layer, the width of the floor layer is the same as the width of the dielectric layer, the length of the floor layer is smaller than the length of the dielectric layer, the upper edge, the lower edge and the left edge of the floor layer are aligned with the upper edge, the lower edge and the left edge of the dielectric layer respectively, and the right edge of the floor layer is aligned with the left edge of the monopole antenna.
As one embodiment, the dielectric plate is a dielectric plate having a relative dielectric constant of 2.55.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, two split resonant rings, a monopole antenna, a feeder line and a microstrip line are printed on the top surface of a dielectric plate, two mutually perpendicular branches are loaded in each split resonant ring, and one branch is loaded in each split resonant ring, wherein the two split resonant ring coupling structures loaded with the branches form a filtering structure, the resonant frequency of the filtering structure is easy to control, the filtering structure has high selectivity, and a three-frequency filtering antenna working at 2.4/5.2/6.4GHz is obtained by combining the filtering structure with the monopole antenna.
2. Compared with the traditional split resonant ring design, the split resonant ring is provided with two branches inside, the overall size of the split resonant ring is not increased, but the working performance of three frequencies is obtained, the first resonant frequency is mainly determined by the lengths of the two split resonant rings, and the second and third resonant frequencies are determined by the two loaded branches.
3. A gap is formed between the two split resonant rings, one split resonant ring is connected with a feeder line, the other split resonant ring is connected with a monopole antenna through a microstrip line, and the bandwidth of the filtering structure can be determined by the gap between the two split resonant rings and the relative position of the microstrip line and the connected split resonant ring.
4. The invention has simple structure, convenient processing and low cost, realizes the characteristic of three frequencies (2.4/5.2/6.4 GHz) and covers the 2.4/5.2GHz frequency band of the WLAN frequency band compared with the prior filter antenna, and has wide application; at the same time, a good gain squareness (i.e. good frequency selectivity) is achieved at three frequency bands, and especially a good gain squareness (i.e. high frequency selectivity) is achieved at 2.4 GHz.
Drawings
Fig. 1 is a schematic structural diagram of a three-frequency filtering antenna in embodiment 1 of the present invention.
Fig. 2 is an electromagnetic simulation reflection coefficient and gain curve chart of the three-frequency filter antenna of the embodiment 1 of the present invention.
The antenna comprises a 1-dielectric plate, a 2-floor layer, a 3-monopole antenna, a 4-feeder, a 5-microstrip line, a 6-first split resonant ring, a 7-second split resonant ring, an 8-first split, a 9-second split, a 10-first branch, a 11-second branch, a 12-third branch, a 13-fourth branch and a 14-fifth branch.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, the three-frequency filter antenna of the present embodiment includes a dielectric plate 1, a relative dielectric constant of the dielectric plate 1 is 2.55, a floor layer 2 is printed on a bottom surface of the dielectric plate 1, two split resonant rings, a monopole antenna 3, a feeder line 4 and a microstrip line 5 are printed on a top surface, the monopole antenna 3 is a rectangular annular monopole antenna, the two split resonant rings are a first split resonant ring 6 and a second split resonant ring 7, and the first split resonant ring 6 and the second split resonant ring 7 are rectangular split rings.
The distance between the upper side and the lower side of the floor layer 2 is used as the width of the floor layer 2, the distance between the left side and the right side of the floor layer 2 is used as the length of the floor layer 2, the width of the floor layer 2 is the same as the width of the dielectric plate 1, the length of the floor layer 2 is smaller than the length of the dielectric plate 1, the upper side, the lower side and the left side of the floor layer 2 are respectively aligned with the upper side, the lower side and the left side of the dielectric plate 1, and the right side of the floor layer 2 is aligned with the left side of the monopole antenna 3.
The openings of the first split resonant ring 6 and the second split resonant ring 7 are a first opening 8 and a second opening 9 respectively, the first opening 8 and the second opening 9 are oppositely arranged, the electric field of a basic mode at the opening is strong when each split resonant ring resonates, and the magnetic field at the other opposite side of the opening is strong, so that the coupling between the two split resonant rings is electric coupling at the moment; in this embodiment, the first opening 8 is located on the right side of the first split ring resonator 6, the second opening 9 is located on the left side of the second split ring resonator 7, the first branch 10 is vertically loaded on the left side of the first split ring resonator 6 (i.e., the side opposite to the side of the first opening 8) and the second branch 11 is vertically loaded on the upper side of the first split ring resonator 6 (i.e., the side of one of the sides adjacent to the side of the first opening 8); inside the second split ring resonator 7, a third branch 12 is vertically loaded on the right side of the second split ring resonator 7 (i.e., the side opposite to the side where the second split 9 is located), and a fourth branch 13 is vertically loaded on the lower side of the second split ring resonator 7 (i.e., one of the sides adjacent to the side where the second split 9 is located).
The first branch 10 and the second branch 11 are perpendicular to each other, so that the first branch 10, the second branch 11, the upper edge of the first split ring resonator 6 and the left edge of the first split ring resonator 6 enclose a small ring inside the first split ring resonator 6, the third branch 12 and the fourth branch 13 are perpendicular to each other, so that the third branch 12, the fourth branch 13, the lower edge of the second split ring resonator 7 and the right edge of the second split ring resonator 7 enclose a small ring inside the second split ring resonator 7, and the small ring inside the first split ring resonator 6 and the small ring inside the second split ring resonator 7 are rotationally symmetrical.
The first split ring 6 and the second split ring 7 have a gap therebetween (as can be seen from fig. 1, the first split ring 6 is connected to the feed line 4 by forming a gap between the side of the first split ring 8 and the side of the second split ring 9), one end of the feed line 4 in this embodiment is connected to the left side of the first split ring 6 (preferably to the left side of the small ring of the first split ring 6), and the other end is in contact with the left side of the dielectric plate 1; the second split ring 7 is connected to the monopole antenna 3 through a microstrip line 5, and in this embodiment, one end of the microstrip line 5 is connected to the right side of the second split ring 7 (preferably to the right side of the small loop of the second split ring 7), and the other end is connected to the left side of the monopole antenna 3.
The two split resonant ring coupling structures loading the dendrites constitute a filtering structure, such a design has many advantages, such as: 1) The resonant frequency is easy to control; 2) Has high selectivity; 3) Compared with the traditional split-ring design, the two branches are loaded in the two split-ring resonant rings, the overall size is not increased, but the three-frequency working performance is obtained, wherein the first resonant frequency is mainly determined by the lengths of the two split-ring resonant rings, and the second and third resonant frequencies are determined by the two branches loaded by the two split-ring resonant rings; the bandwidth of the filter structure is mainly related to the external quality factor of the two split resonant rings and the coupling coefficient between the two split resonant rings, the gap between the two split resonant rings has a great influence on the coupling coefficient, and the relative position of the microstrip line 5 and the second split resonant ring 7 has a great influence on the external quality factor, so that the gap between the two split resonant rings and the relative position of the microstrip line 5 and the second split resonant ring 7 determine the bandwidth.
In the monopole antenna 3, a fifth branch 14 is vertically loaded on the right side of the monopole antenna 3, the fifth branch 14 can be loaded on other sides of the monopole antenna 3, the length of the monopole antenna 3 determines a first working frequency band of the antenna, the length and the width of the fifth branch 14 determine a second working frequency band and the bandwidth, by combining the filtering structure with the monopole antenna 3, a three-frequency filtering antenna working at 2.4/5.2/6.4GHz is obtained, as shown in an electromagnetic simulation reflection coefficient (S11) and a gain curve shown in fig. 2, in the three frequency bands of 2.4/5.2/6.4GHz, |S11| -10dB is shown, and meanwhile, in the three frequency bands of 2.4/5.2/6.4GHz, the selectivity is very high, namely, in the three frequency bands of 2.4/5.2/6.4GHz, the rectangular gain is realized, and in particular, in the three frequency bands of 2.4/5.2/6.4GHz, the rectangular gain is very good; in the directional pattern characteristic, the H surface realizes the omnidirectional characteristic, the radiation of the E surface is similar to an 8 shape, and the directional pattern characteristic has better stability on the whole frequency band.
In the above embodiment, the floor layer 2, the monopole antenna 3, the feeder line 4, the microstrip line 5, the first split resonant ring 6, the second split resonant ring 7, the first branch 10, the second branch 11, the third branch 12, the fourth branch 13, and the fifth branch 14 are all made of metal materials, for example, any one of aluminum, iron, tin, copper, silver, gold, and platinum, or an alloy of any one of aluminum, iron, tin, copper, silver, gold, and platinum.
In summary, the invention prints two split resonant rings, a monopole antenna, a feeder line and a microstrip line on the top surface of the dielectric plate, loads two mutually perpendicular branches in each split resonant ring, and loads one branch in the monopole antenna, wherein the two split resonant ring coupling structures loaded with the branches form a filtering structure, the resonant frequency of the filtering structure is easy to control, the filtering structure has high selectivity, and by combining the filtering structure with the monopole antenna, a three-frequency filtering antenna working at 2.4/5.2/6.4GHz is obtained, and the antenna combines the characteristics of a filter and the antenna, thereby not only reducing the design complexity, but also having a more compact structure and reducing the loss.
The above-mentioned embodiments are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can make equivalent substitutions or modifications according to the technical solution and the inventive concept of the present invention within the scope of the present invention disclosed in the present invention patent, and all those skilled in the art belong to the protection scope of the present invention.
Claims (2)
1. The utility model provides a three frequency filter antenna with high frequency selectivity, includes dielectric plate, its characterized in that: the dielectric plate is characterized in that a floor layer is printed on the bottom surface of the dielectric plate, two split resonant rings, a monopole antenna, a feeder line and a microstrip line are printed on the top surface of the dielectric plate, the two split resonant rings are bilaterally symmetrical, the openings of the two split resonant rings are opposite, a gap is reserved between the two split resonant rings, and two mutually perpendicular branches are loaded in each split resonant ring; one split resonant ring is connected with a feeder line, the other split resonant ring is connected with a monopole antenna through a microstrip line, and a branch is loaded in the monopole antenna;
the two split-ring resonators are a first split-ring resonator and a second split-ring resonator respectively, and the first split-ring resonator and the second split-ring resonator are rectangular split-rings; the opening of the first split-ring resonator and the opening of the second split-ring resonator are respectively a first opening and a second opening; the two loaded branches in the first open resonance ring are a first branch and a second branch respectively, and the two loaded branches in the second open resonance ring are a third branch and a fourth branch respectively; the first branch is vertically loaded on the side opposite to the side where the first opening resonance ring is located, the second branch is vertically loaded on the side where the first opening resonance ring is adjacent to the side where the first opening is located, the third branch is vertically loaded on the side opposite to the side where the second opening resonance ring is located, and the fourth branch is vertically loaded on the side where the second opening resonance ring is adjacent to the side where the second opening is located;
the first branch, the second branch, the edge adjacent to the edge where the first opening is located and the edge opposite to the edge where the first opening is located enclose a small ring inside the first opening resonance ring, the third branch, the fourth branch, the edge adjacent to the edge where the second opening is located and the edge opposite to the edge where the second opening is located enclose a small ring inside the second opening resonance ring, and the small ring inside the first opening resonance ring and the small ring inside the second opening resonance ring are rotationally symmetrical;
the monopole antenna is a rectangular annular monopole antenna, the loaded branch in the monopole antenna is a fifth branch, and the fifth branch is vertically loaded on one side of the monopole antenna;
one end of the feeder line is connected with one of the edges of the first opening resonant ring except the edge where the first opening is located, and the other end of the feeder line is contacted with one edge of the dielectric plate; one end of the microstrip line is connected with one of the edges of the second split resonant ring except the edge where the second split is located, and the other end of the microstrip line is connected with the left side of the monopole antenna;
the distance between the upper side and the lower side of the floor layer is used as the width of the floor layer, the distance between the left side and the right side of the floor layer is used as the length of the floor layer, the width of the floor layer is the same as the width of the dielectric plate, the length of the floor layer is smaller than the length of the dielectric plate, the upper side, the lower side and the left side of the floor layer are respectively aligned with the upper side, the lower side and the left side of the dielectric plate, and the right side of the floor layer is aligned with the left side of the monopole antenna.
2. A three-frequency filtering antenna with high frequency selectivity according to claim 1, characterized in that: the dielectric plate is a dielectric plate with a relative dielectric constant of 2.55.
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| CN107404010B (en) * | 2017-06-22 | 2020-03-10 | 西安电子科技大学 | Dual-band filtering MIMO antenna |
| CN109193163A (en) * | 2018-07-03 | 2019-01-11 | 西安电子科技大学 | Three frequency filter antennas, radio system radio-frequency front-end based on minor matters load resonator |
| CN108808184B (en) * | 2018-07-17 | 2023-09-22 | 云南大学 | All-dielectric integrated packaged low-pass filter |
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