CN210111035U - Novel monopole antenna loaded with left-handed material unit - Google Patents
Novel monopole antenna loaded with left-handed material unit Download PDFInfo
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- CN210111035U CN210111035U CN201920001192.6U CN201920001192U CN210111035U CN 210111035 U CN210111035 U CN 210111035U CN 201920001192 U CN201920001192 U CN 201920001192U CN 210111035 U CN210111035 U CN 210111035U
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Abstract
The utility model discloses a novel monopole antenna of loading left hand material unit relates to the radio communication field. The monopole antenna is of a planar structure and comprises: the antenna comprises a dielectric plate (1), a coplanar waveguide (2), a semi-annular radiation patch (3) and an arc microstrip line (4); one end of a feeder line (20) of the coplanar waveguide (2) for feeding is connected with the central position of the semi-annular radiation patch (3), and the arc microstrip line (4) is positioned right above the semi-annular radiation patch (3); an array (5) formed by a plurality of circular left-handed material units is printed between the semi-annular radiation patch (3) and the arc microstrip line (4). The utility model relates to a novel monopole antenna of loading left hand material unit pass through loading circle left hand material unit for ordinary monopole antenna has realized better impedance match, has also obtained the improvement of gain simultaneously, and it is little to have a size, simple structure, workable, high gain, advantages such as low-loss.
Description
Technical Field
The utility model belongs to the wireless communication field relates to a novel monopole antenna of loading left hand material unit.
Background
The left-handed material is the most classical metamaterial and is defined as having both negative permittivity and negative permeability in certain frequency bands. Consisting of an artificial unit structure with a periodicity much smaller than the operating wavelength, which can exhibit extraordinary physical properties not possessed by natural materials.
With the rapid development of information technology, wireless communication technology can transmit and exchange information at any time and any place because the wireless communication technology is not restricted by geographical environment, and is widely applied to the aspects of life and social development of people, and meanwhile, the diversification of wireless communication modes greatly facilitates the life and work of people. In a ubiquitous wireless communication system, information is often transmitted by radio waves, and an antenna is an important component in the wireless communication system, which intuitively affects the efficiency and quality of wireless communication. With the rapid growth of various communication systems nowadays, the desire of the industry to achieve multiple performance and indexes of antennas at the same time is increasing, and good performance parameters require the development of more novel and specific structures in the design of antennas, and require higher-quality boards to support the design of antennas, obviously, the cost of antennas is greatly increased in an intangible manner. However, the appearance of the metamaterial makes the problem to find a feasible method, and the loading of the metamaterial is designed, so that the cost for manufacturing the antenna can be controlled, and meanwhile, a plurality of performance parameters of the antenna are improved, and therefore, the metamaterial and the antenna are effectively combined, and the research for improving the performance parameters of the antenna has profound value and significance.
In recent years, many researchers have made substantial progress in applying metamaterials to antenna design. As a brand new artificial electromagnetic material, the metamaterial has a series of peculiar physical properties such as negative refractive index, negative group velocity, inverse Doppler effect and the like, and can be applied to the traditional antenna design to obviously improve the working performance of the antenna, such as gain improvement, bandwidth increase, miniaturization, multi-band realization, antenna-to-antenna coupling reduction and the like. It is worth noting that the novel antenna based on the metamaterial can improve a certain index of the novel antenna and can improve multiple indexes.
Disclosure of Invention
The utility model aims at providing a novel monopole antenna loaded with left-handed material units; by loading the left-handed material unit in the shape of a circular loop, the common monopole antenna realizes better impedance matching, simultaneously gains are improved, and the monopole antenna has the advantages of small size, simple structure, easiness in processing, high gain, low loss and the like.
The utility model relates to a novel monopole antenna of loading left hand material unit, include: the monopole antenna comprises a monopole antenna dielectric plate (1), a coplanar waveguide (2), a semi-annular radiation patch (3) and an arc microstrip line (4); one end of a feeder line (20) of the coplanar waveguide (2) for feeding is connected with the central position of the semi-annular radiation patch (3), and an arc microstrip line (4) positioned above the semi-annular radiation patch (3) is a near-field resonance parasitic unit of the semi-annular radiator; an array (5) formed by a left-handed material unit in a circular shape is printed between the semi-annular radiation patch (3) and the arc microstrip line (4); each unit of the array (5) formed by the left circular-shaped material units comprises a circular-shaped patch (10) printed on the left-hand material unit medium plate (1); the circular patch (10) consists of two external semicircles (6, 6 '), two internal semicircles (7, 7') and a microstrip line (8) passing through the center of a circle; the two outer semicircles (6, 6 ') are arranged up and down, and the two inner semicircles (7, 7') are arranged left and right by rotating 90 degrees around the center of the circle compared with the outer semicircles.
According to the novel monopole antenna loaded with the left-handed material unit, the antenna can realize good impedance matching with the driving unit by adjusting the arc parasitic unit, and the size of the near-field resonance parasitic unit is far larger than that of the driving unit, so that the arc parasitic unit is the main radiator of the antenna.
According to the novel monopole antenna loaded with the left-hand material units, an array (5) formed by the left-hand material units printed between the semi-annular radiation patch (3) and the arc-shaped microstrip line (4) in the shape of a circle can be formed by 1-3 left-hand material units in the shape of a circle, and when only 1 left-hand material unit in the shape of a circle is loaded, the left-hand material unit is positioned between the semi-annular radiation patch (3) and the arc-shaped microstrip line (4) in the horizontal and vertical middle positions; when 2 circular left-handed material units are loaded, the left and right 2 left-handed material units are vertically centered between the semi-annular radiation patch (3) and the arc microstrip line (4) and symmetrically distributed on two sides of the center line; when loading 3 left-handed material units in a circular shape, the middle left-handed material unit is translated upwards by half the radius of the inner circle in the vertical direction relative to the 2 units on the left and right, the 3 left-handed material units forming an array of inverted V-shapes.
The novel monopole antenna loaded with the left-handed material unit adopts an FR4 dielectric plate with the thickness of 1.2mm and the size of 25mmX30 mm; the left-handed material element has a size of 5mmX5 mm.
The utility model has the advantages of small size, simple structure, easy processing, high gain, low loss and the like.
Drawings
Fig. 1 is a schematic view of a monopole antenna structure.
FIG. 2 is a schematic diagram of a left-handed material unit with a round shape.
Fig. 3 is a schematic diagram of a monopole antenna structure loaded with 1-3 left-handed material elements.
Fig. 4 is a return loss contrast plot for a novel left-handed material element loaded monopole antenna.
Fig. 5 is a comparison of the directional patterns of a novel monopole antenna loaded with left-handed material elements.
Fig. 6 is a graph of the radiation efficiency of a novel left-handed material element loaded monopole antenna.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, fig. 2 and fig. 3, the novel monopole antenna loaded with left-handed material units of the present invention comprises a monopole antenna dielectric plate 1, a coplanar waveguide 2, a semi-annular radiation patch 3 and an arc microstrip line 4; one end of a feeder line 20 of the coplanar waveguide 2 for feeding is connected with the central position of the semi-annular radiation patch 3, and an arc microstrip line 4 positioned above the semi-annular radiation patch 3 is a near-field resonance parasitic unit of the semi-annular radiator; an array 5 formed by circular left-handed material units is printed between the semi-annular radiation patch 3 and the arc microstrip line 4; each unit of the array 5 formed by the left circular-shaped material units is a circular-shaped patch 10 printed on a left-hand material unit medium plate 9; the circular patch 10 is composed of two outer semicircles 6 and 6 ', two inner semicircles 7 and 7' and a microstrip line 8 passing through the center of a circle; the two outer semicircles 6, 6 'are arranged up and down, and the two inner semicircles 7, 7' are rotated by 90 degrees around the center of the circle compared with the outer semicircles, and are arranged left and right. According to the novel monopole antenna loaded with the left-handed material unit, the antenna can realize good impedance matching with the driving unit by adjusting the arc parasitic unit, and the size of the near-field resonance parasitic unit is far larger than that of the driving unit, so that the arc parasitic unit is the main radiator of the antenna.
In the novel monopole antenna loaded with the left-hand material units, an array 5 formed by the left-hand material units in the shape of a circle printed between the semi-annular radiation patch 3 and the arc microstrip line 4 can be formed by 1-3 left-hand material units in the shape of a circle, and when only 1 left-hand material unit in the shape of a circle is loaded, the left-hand material unit is positioned between the semi-annular radiation patch 3 and the arc microstrip line 4 in the horizontal and vertical middle positions; when 2 circular left-handed material units are loaded, the left and right 2 left-handed material units are vertically centered between the semi-annular radiation patch 3 and the arc microstrip line 4 and symmetrically distributed on two sides of the center line; when loading 3 left-handed material units in a circular shape, the middle left-handed material unit is translated upwards by half the radius of the inner circle in the vertical direction relative to the 2 units on the left and right, the 3 left-handed material units forming an array of inverted V-shapes.
The novel monopole antenna loaded with the left-handed material unit adopts an FR4 dielectric plate with the thickness of 1.2mm and the size of 25mmX30 mm; the left-handed material element has a size of 5mmX5 mm.
The return loss contrast diagram of the antenna loaded with different numbers is obtained by carrying out multiple times of adjustment experiments on the antenna through simulation software and is shown in fig. 4, and the diagram shows that the frequency band of S11< -10dB is 5.27GHz-7.9GHz, the resonance point is 5.6GHz, the S11 value at the resonance point is-31 dB, and meanwhile, a resonance point with an S11 value of-21 dB exists near 6.5GHz when the left-handed material is not loaded on the antenna; the working bandwidth of the antenna loaded with one round left-handed material unit is 5.59GHz-8.2GHz, the whole antenna moves by nearly 300MHz to high frequency compared with the left-handed material, the resonance point moves upwards to 5.8GHz, the S11 value is-29 dB, the bandwidth of the antenna loaded with two left-handed material units is almost consistent with the bandwidth loaded with one left-handed material and the resonance point, the difference is that the antenna loaded with two left-handed material units obtains better impedance matching at the resonance point, and the S11 value is-42 dB; when the number of the left-handed material units is loaded to three, the working bandwidth of the antenna operation, the resonance point and the value at the resonance point are in a slight descending trend. In general, loading the left-handed material has little effect on the bandwidth of the antenna.
The antenna is loaded with different numbers of patterns at 5.6GHz, as compared with the graph shown in fig. 5, wherein fig. 5(a) is the xoz plane pattern of the antenna, and fig. 5(b) is the yoz plane pattern of the antenna. In order to facilitate analysis of the influence of each component on the overall radiation of the antenna in the radiation process of the antenna, the directional diagram of the antenna is described in the section by adopting a co-polarization mode and a cross-polarization mode. In fig. 5(a), the maximum values of the gain of the antenna xoz plane co-polarization are 2.23dB, 2.75dB, 3.45dB and 3.21dB respectively in the process of increasing the number of left-handed material elements from 0 to 3; in fig. 5(b), the gain of the antenna yoz plane co-polarization is respectively 1.98dB, 2.45dB, 2.97dB and 2.78dB at the maximum value in the process of increasing the number of left-handed material units from 0 to 3. Therefore, the gain of the antenna is improved due to the increase of the ring-shaped left-handed material units, but when the number of the loaded left-handed material units is as large as three, the radiation of the antenna is hindered to a certain extent due to matching, and therefore, two ring-shaped left-handed material units are loaded near the antenna near-field parasitic unit. And through the comparative observation of xoz plane and yoz plane directional diagrams, we find that xoz plane cross polarization of the antenna is extremely small, and radiation is hardly influenced by the cross polarization, but the cross polarization of the yoz plane is not obviously far smaller than that of common polarization, and still needs to be improved.
The radiation efficiency of the antenna is shown in fig. 6, and it can be seen from the figure that as the number of the loaded annular left-handed materials increases, the gain of the antenna increases continuously, so that the radiation efficiency of the antenna shows an increasing trend, and although the radiation efficiency fluctuates in the working frequency band, the radiation efficiency is all over 88%, and good radiation can be realized.
Claims (4)
1. A novel monopole antenna loaded with left-handed material units is characterized in that: the monopole antenna comprises a monopole antenna dielectric plate (1), a coplanar waveguide (2), a semi-annular radiation patch (3) and an arc microstrip line (4); one end of a feeder line (20) of the coplanar waveguide (2) for feeding is connected with the central position of the semi-annular radiation patch (3), and the arc microstrip line (4) is positioned right above the semi-annular radiation patch (3) and is a near-field resonance parasitic unit of the semi-annular radiator; an array (5) formed by a left-handed material unit in a circular shape is printed between the semi-annular radiation patch (3) and the arc microstrip line (4); each unit of the array (5) formed by the left circular-shaped material units comprises a left-hand material unit medium plate (9) and a circular-shaped patch (10) printed on the left-hand material unit medium plate (9); the circular patch (10) consists of two external semicircles (6, 6 '), two internal semicircles (7, 7') and a microstrip line (8) passing through the center of a circle; the two external semicircles (6, 6 ') are arranged up and down, and the semicircles intersected with the two internal semicircles (7, 7') are arranged left and right by rotating 90 degrees around the center of a circle.
2. The novel left-handed material element-loaded monopole antenna of claim 1, wherein: the antenna can realize good impedance matching with the driving unit by adjusting the arc parasitic unit, and the size of the near-field resonance parasitic unit is far larger than that of the driving unit, so that the arc parasitic unit is a main radiating body of the antenna.
3. The novel left-handed material element-loaded monopole antenna of claim 1, wherein: an array (5) formed by circular left-hand material units printed between the semi-annular radiation patch (3) and the arc microstrip line (4) is formed by 3 circular left-hand material units, the middle left-hand material unit upwards translates by a distance of half of the radius of the inner ring in the vertical direction of the 2 units relative to the left side and the right side, and the 3 left-hand material units form an inverted V-shaped array.
4. The novel left-handed material element-loaded monopole antenna of claim 1, wherein: FR4 medium plates with the thickness of 1.2mm and the size of 25mmX30mm are adopted; the left-handed material element has a size of 5mmX5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920001192.6U CN210111035U (en) | 2019-01-02 | 2019-01-02 | Novel monopole antenna loaded with left-handed material unit |
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| CN201920001192.6U CN210111035U (en) | 2019-01-02 | 2019-01-02 | Novel monopole antenna loaded with left-handed material unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509977A (en) * | 2019-01-02 | 2019-03-22 | 云南大学 | The monopole antenna of the back-shaped left-handed material unit of load circle |
| CN112928455A (en) * | 2021-02-04 | 2021-06-08 | 北京邮电大学 | Metamaterial RFID (radio frequency identification) tag antenna |
| CN113708062A (en) * | 2021-09-13 | 2021-11-26 | 四川大学 | Three-dimensional high-temperature superconducting super-gain antenna based on resonant ring |
-
2019
- 2019-01-02 CN CN201920001192.6U patent/CN210111035U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509977A (en) * | 2019-01-02 | 2019-03-22 | 云南大学 | The monopole antenna of the back-shaped left-handed material unit of load circle |
| CN109509977B (en) * | 2019-01-02 | 2023-08-08 | 云南大学 | Monopole antenna loaded with round-loop left-handed material unit |
| CN112928455A (en) * | 2021-02-04 | 2021-06-08 | 北京邮电大学 | Metamaterial RFID (radio frequency identification) tag antenna |
| CN112928455B (en) * | 2021-02-04 | 2022-03-01 | 北京邮电大学 | Metamaterial RFID (radio frequency identification) tag antenna |
| CN113708062A (en) * | 2021-09-13 | 2021-11-26 | 四川大学 | Three-dimensional high-temperature superconducting super-gain antenna based on resonant ring |
| CN113708062B (en) * | 2021-09-13 | 2022-06-03 | 四川大学 | Three-dimensional high-temperature superconducting super-gain antenna based on resonant ring |
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