CN209896263U - Multi-band antenna based on composite left-right-hand transmission line - Google Patents
Multi-band antenna based on composite left-right-hand transmission line Download PDFInfo
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Abstract
The utility model discloses a multi-band antenna based on composite left and right hand transmission line, which comprises a coaxial feeder line, a rectangular radiation patch, a through hole, an inverted F antenna, a curved line, a ground and an FR4 substrate; the antenna comprises a rectangular radiation patch, an inverted-F antenna and a meander line, wherein a composite left-hand and right-hand transmission line structure is formed by the rectangular radiation patch, the inverted-F antenna and the meander line, the composite left-hand and right-hand transmission line structure forms a zero-order resonance mode to generate a low-frequency band (670-.
Description
Technical Field
The utility model belongs to the technical field of the antenna, concretely relates to multifrequency section antenna based on compound right-hand and left-hand transmission line, based on CRLH-TL ZOR (compound right-hand and left-hand material transmission line-zero order resonance) structure forms the compact miniaturized wiFi antenna of multifrequency section in order to reach covering LTEband 12 (698) 746GHz) and wiFi 2.4GHz and 5.0GHz dual-band.
Background
In recent years, due to the continuous progress of the scientific and technological age, the demand of people for portable mobile communication is increased, and meanwhile, the development of wireless communication systems at home and abroad is more and more rapid due to the rapid wireless transmission of a large amount of information such as images and videos. As a front-end device for transmitting and receiving electromagnetic wave signals, antennas play a very important role in radio systems. Meanwhile, with the rapid development of scientific technology and the arrival of the information age, antennas are continuously developing toward multi-frequency, miniaturization, and broadband. Conventional antennas are increasingly difficult to meet, and under the background of the complex technology of the new era, more and more wireless communication technologies may need to use multiple frequencies simultaneously, or multiple communication systems in a fixed space need to work in different frequency bands and modes. If one or a few antennas can be used to meet the requirements of many wireless communication systems, a large number of diverse antennas operating in different frequency bands can be avoided, which leads to a demand for high-performance multi-frequency antennas. Meanwhile, with the rapid development of wireless communication technology and the improvement of processing technology, the requirements for mobility and portability of wireless communication equipment are increasing. On the premise of ensuring the radiation characteristic of the antenna, how to reduce the size of the antenna and promote the communication equipment to continuously move towards integration and integration is always another key point and difficulty in antenna design in recent years. The antenna size is reduced, resulting in a reduction in radiation resistance and an increase in the imaginary part of the input impedance of the antenna, thereby making it difficult to match with a conventional transmission line. The traditional antenna is loaded, so that the input impedance characteristic of the antenna can be improved to a certain extent, but because the loading inevitably occupies a certain space and forms redundant volume, the contribution to the miniaturization of the antenna is limited. This means that new approaches must be found to develop antenna miniaturization techniques to meet the needs of wireless communication systems.
For adapting to the current broadband connection's rapid development, satisfy people to wireless connection stability and quick requirement, present 5GHzWiFi technique has been had, in addition original 2.4GHz, just formed present wiFi dual-band, according to international IEEE 802.11b/g and IEEE 802.11ac/n agreement standard, wiFi low frequency operating range is 2.4-2.4825GHz, high frequency operating range is 5.15-5.825GHz, in view of the antenna size that is applicable to wiFi high frequency channel at present all great defect, and simultaneously, traditional compound right-and-left-handed transmission line structure antenna, its design frequency channel is mostly dual-band, only can cover the utility model provides a wherein two frequency channels or cover the utility model provides a frequency channel and other class wave bands are necessary to go to study a scheme and solve this kind of defect.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks, the present invention provides a design idea of a resonant antenna with miniaturized multiple frequency bands, which realizes miniaturization, wide frequency band and multiple frequency bands of the antenna by generating a zero-order resonant structure through a composite left-right hand transmission line structure.
In order to solve the technical problem existing in the prior art, the technical scheme of the utility model as follows:
a multi-band antenna based on a composite left-right hand transmission line comprises a substrate (7), a first circuit layer and a second circuit layer, wherein the first circuit layer and the second circuit layer are respectively arranged on two sides of the substrate (7), the first circuit layer is at least provided with an inverted-F antenna (2) and a rectangular radiation patch (1), and the second circuit layer is at least provided with a curved flow line (3) and a ground (5); wherein the content of the first and second substances,
the multi-band antenna is also provided with a coaxial feeder (6), and the coaxial feeder (6) is used for feeding the inverted-F antenna (2);
the rectangular radiation patch (1) is connected with a curved flow line (3) through a through hole (4), the curved flow line (3) is connected with the ground (5), and the rectangular radiation patch (1), the inverted-F antenna (2) and the curved flow line (3) form a composite left-right hand transmission line unit; the composite left-right hand transmission line unit forms a zero-order resonance mode to generate a low-frequency band (670-; the inverted F antenna (2) and the rectangular radiation patch (1) form a coupling structure to excite the rectangular radiation patch (1) to form a current loop, and a WiFi low-frequency band (2.18-2.52GHz) is generated to cover a 2.4GHz WiFi band; the inverted-F antenna (2) generates a WiFi high frequency band (4.73-6.38GHz) to cover the 5.0GHz WiFi band.
As a further improvement scheme, in the composite left-right hand transmission line unit, a coupling capacitor is generated between the rectangular radiation patch (1) and the meander line (3) and is used as a series left-hand capacitor CLThe self inductance of the inverted F antenna (2) is used as the series right-hand inductance LRThe inductance of the meander line (3) is used as the parallel left-hand inductance LLA coupling capacitor is generated between the rectangular radiation patch (1) and the inverted-F antenna (2) and is used as a parallel right-hand capacitor CR。
As a further improvement, when the composite left-right hand transmission line structure forms a zero-order resonance mode, omegase＝ωsh＝ω0Wherein, ω is0Is the resonant frequency, omegaseIn order to be the series-resonant frequency,
ωshin order to be the parallel resonance frequency,
as a further improvement, the impedance value of the coaxial feeder (6) is 50 ohms.
As a further improvement, the coaxial feeder (6) is insulated by an insulator at the outside, and the bottom of the coaxial feeder is sealed by a plating head.
As a further improvement, the substrate (7) adopts an FR4 substrate.
As a further improvement, the volume of the substrate (7) is 105 × 60 × 0.8mm3, the area of the ground (5) is 90 × 60mm2, and the area of the rectangular radiation patch (1) is 19 × 4mm 2.
As a further improvement, the radius of the through hole (4) is 0.3mm, the feed probe of the coaxial feed line (6) is 0.35mm, and the radius of the coaxial feed line (6) is 0.75 mm.
As a further improvement, the width of the curved flow line (3) is 0.72mm, the total length of the curved flow line (3) is 60.6mm, and the total length of the inverted-F antenna (2) is 30 mm.
As a further improvement, the series left-hand capacitor CL0.43pF, the series right hand inductor LR0.51nH, the left-hand inductance LL1.12nH, said parallel right-hand capacitor CR＝0.18pF。
Compared with the prior art, the utility model discloses a loading rectangle radiation patch, meander line, the compound left and right hands transmission line unit of falling F antenna constitution form zero order resonant frequency, utilize the characteristics of this kind of structure, under the condition that does not influence or improve antenna performance, reduced the size of antenna, realized the compactness; the utility model discloses under the prerequisite that does not increase cost of manufacture and technology complexity, can cover more frequency channels. The zero-order resonant frequency mode can cover the LTE band12(698-746GHz) wave band, and simultaneously can generate two resonant frequencies of 2.4GHz and 5.0GHz to cover the WiFi wave band. The utility model discloses maximum gain in whole frequency channel reaches 9.17dB, compares in the antenna of the same kind, and the gain has obvious promotion.
Drawings
Fig. 1 is a general structure diagram of the multiband antenna based on the composite right-and-left-handed transmission line of the present invention, wherein the left side is the front side of the substrate (first circuit layer) and the right side is the back side of the substrate (second circuit layer).
Fig. 2 is a schematic diagram of the structure of the actual antenna size part of the present invention.
Fig. 3 is an equivalent circuit diagram of the composite right-left hand transmission line unit of the present invention.
Fig. 4 is a diagram illustrating the s11 return loss parameter in a preferred embodiment of the present invention.
Fig. 5 is a 2D directional diagram of the antenna in a preferred embodiment of the present invention at a resonant frequency of 0.7 GHz.
Fig. 6 is a 2D directional diagram of the antenna in a preferred embodiment of the present invention at a resonant frequency of 2.45 GHz.
Fig. 7 is a 2D pattern diagram of the antenna at a resonant frequency of 5.0GHz in a preferred embodiment of the invention.
Detailed Description
The technical solution provided by the present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1-2, the present invention discloses a structural diagram of a multiband antenna based on a composite right-left hand transmission line, which comprises a substrate (7), and a first circuit layer and a second circuit layer respectively disposed on two sides of the substrate (7), wherein the first circuit layer is at least provided with an inverted F antenna (2) and a rectangular radiation patch (1), and the second circuit layer is at least provided with a meander line (3) and a ground (5);
the multi-band antenna is also provided with a coaxial feeder (6), and the coaxial feeder (6) feeds the inverted-F antenna (2);
the rectangular radiation patch (1) is connected with the curved flow line (3) through the through hole (4), the curved flow line (3) is connected with the ground (5), the rectangular radiation patch (1), the inverted-F antenna (2) and the curved flow line (3) form a composite left-right hand transmission line unit, and the composite left-right hand transmission line unit forms a zero-order resonance mode to generate a low-frequency band (670-; the inverted F antenna (2) and the rectangular radiation patch (1) form a coupling structure to excite the rectangular radiation patch (1) to form a current loop, and a WiFi low-frequency band (2.18-2.52GHz) is generated to cover a 2.4GHz WiFi band; the inverted-F antenna (2) generates a WiFi high frequency band (4.73-6.38GHz) to cover the 5.0GHz WiFi band.
In a preferred embodiment, the coaxial feeder is insulated outside the coaxial line by using an insulator in simulation so as to avoid the influence of the coaxial feeder on the radiation of the antenna, and the bottom of the coaxial line is sealed by using a plating head so as to avoid the downward leakage of an electromagnetic field of the coaxial line.
Referring to fig. 3, an equivalent circuit diagram of the composite right/left-handed transmission line unit is shown, in which a rectangular radiation patch, an inverted-F antenna and a meander line form a composite right/left-handed transmission line structure, and the equivalent circuit diagram is shown in fig. 3, and a coupling capacitor is generated between the rectangular radiation patch (1) and the meander line (3) as a series left-handed capacitor CLThe self inductance of the inverted F antenna (2) is used as the series right-hand inductance LRThe inductance of the meander line (3) is used as the parallel left-hand inductance LLA coupling capacitor is generated between the rectangular radiation patch (1) and the inverted-F antenna (2) and is used as a parallel right-hand capacitor CR。
Referring to fig. 3, in a composite left-hand and right-hand transmission line structure unit with a length Δ z, a voltage positive input end is connected in series with a left-hand capacitor, then connected in series with a right-hand inductor, then connected in parallel with a right-hand capacitor, then connected in parallel with a left-hand inductor, and finally output from a voltage output end.
In the technical scheme, compound left and right hands structure does the utility model discloses a main radiation structure, when reducing antenna area, additionally produce two frequency channels, realize the multifrequency section, because the application of the antenna of falling F, the length of adjusting the minor matters can expand its high frequency bandwidth, realizes high frequency 5.0 GHz's broadband. Meanwhile, due to the existence of the zero-order resonance mode, the electric field is in plane distribution at the moment, no potential difference exists, the electric length is irrelevant to the physical size and is only relevant to the distribution parameters of the physical structure of the composite left-hand and right-hand transmission lines, so that the size of the microstrip antenna can break through the limitation of lambda/4 wavelength, and the miniaturization of the antenna is realized.
The technical principle of the present invention is detailed below:
as shown in fig. 3, for a uniform lossless transmission line, the phase constants are:
wherein S (ω) is a sign function:
wherein series and parallel resonant frequencies
The phase constants of the composite right and left handed transmission lines are discussed below in terms of different frequency bins:
when omega > omegaΓ2When the temperature of the water is higher than the set temperature,
the composite right-and-left-handed transmission line now exhibits right-handed transmission line characteristics.
When omega < omegaΓ2Time of flight
The composite right-and-left-handed transmission line exhibits a right-handed transmission characteristic at this time.
When ω isΓ1＜ω＜ωΓ2When the temperature of the water is higher than the set temperature,
the composite right-and-left-handed transmission line is in a band gap mode, which is a characteristic unique to the composite right-and-left-handed transmission line, and the above are all unbalanced conditions, and one special condition is considered, namely when omega isse＝ωshThis condition is called the equilibrium condition, when LRCL＝LLCRIn this case, a zero order resonance mode is generated.
Wherein the resonant frequency
The resonance frequency is now only dependent on the reactance parameters of the structural element and not on the physical dimensions of the resonator itself, and when β >0, i.e. when n takes different positive values +1, +2 …, the transmission line will behave as a right-handed transmission line, resulting in a higher resonance frequency. The composite right-left hand transmission line has the ranges of beta being 0 (boundary frequency), beta being 0 (left hand attribute frequency range) and beta being 0 (right hand attribute frequency range), so the electrical length theta can be larger than zero, zero or even smaller than zero, and the resonance orders n and 0 are in a symmetrical relationship. The structural length L and the corresponding resonance frequency ω n or electrical length θ or half wavelength have the following relationship:
Wherein n is 0, ± 1, ± 2, ± 3, …,
in the formula, m and β n are the resonance order and the phase constant, respectively. Similar to the traditional transmission line, on the abscissa β/pi, the dispersion curve graph is sampled with a velocity of pi/d, and different resonant frequency values can be obtained. Likewise, the frequency bandwidth of the uniform lossless composite right-left hand transmission line is infinite width ω ∈ [0, ∞), and the corresponding resonator will have infinite order resonance. And the size of the resonator can be miniaturized due to the existence of the zero-order resonance mode. The resonator formed by the composite left-right hand transmission line essentially has a multi-frequency characteristic, and the antenna designed by the composite left-right hand transmission line essentially also has a multi-frequency characteristic.
From the above formula of series-parallel resonant frequency, when the series reactance parameter (L) of the short-circuited terminal zero-order resonant antenna is changedR、CL) Or the parallel reactance parameter (L) of an open-ended zero-order resonant antennaL、CR) In the process, the resonant frequency of the antenna is changed, namely the resonant frequency of the antenna can be adjusted within a certain range only by changing the corresponding reactance parameter on the premise of not changing the physical size of the antenna.
The utility model discloses an sculpture metal paster structure on the base plate, including rectangle radiation paster, through-hole, the antenna of falling F, meander line, ground, form compound left and right hands structure, utilize its zero order resonance characteristic to produce low frequency wave band to cover LTE band12 (698) 746GHz, utilize the interact of the antenna of falling F and rectangle radiation paster and the antenna radiation effect of falling F to produce high frequency wave band, in order to cover 2.4GHz and 5.0GHzWiFi wave band.
The utility model discloses among the technical scheme, because of the existence of zero order resonance mode for the antenna size is enough little, and the base plate adopts 0.8mmFR-4 dielectric plate, and dielectric loss is 4.4, and in a preferred embodiment, the actual volume of the antenna of preparing is 15 × 21.7 × 0.8mm3, and the volume is less, easily integrated processing, and the maximum gain reaches 9.17dB in the whole frequency channel, can be applied to the cell-phone antenna. The volume of the substrate is 105 × 60 × 0.8mm3, the area of the system ground is 90 × 60mm2, the area of the rectangular radiation patch is 19 × 4mm2, the radius of the through hole is 0.3mm, the coaxial line feed probe is 0.35mm, the radius of the coaxial line is 0.75mm, the width of the curved flow line is 0.72mm, the total length of the curved flow line is 60.6mm, the total length of the inverted F antenna is 30mm, and the equivalent circuit parameters are as follows: l isR＝0.51nH,CL＝0.43pF,LL＝1.12nH,CR＝0.18pF。
In the above parameter design, the return loss s11 parameter is schematically shown in fig. 4. The utility model discloses can just can make antenna resonant frequency adjustable in the certain limit through changing the reactance parameter, the hand structure does about compound the utility model discloses a main radiation structure when reducing antenna area, additionally produces two frequency channels, realizes multifrequency section, because the application of the antenna of falling F, adjusts the length of minor matters and can expand its high frequency bandwidth, realizes high frequency 5.0 GHz's broadband. The utility model discloses the 2D directional diagram at each resonance frequency point sees attached figure 5, 6, 7, can see that it is the omnidirectional radiation when the low frequency, and the directionality is good. And a few split lobes appear at high frequency, and for the mobile phone antenna, the split lobes are allowed to appear.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The multiband antenna is characterized by comprising a substrate (7), a first circuit layer and a second circuit layer, wherein the first circuit layer and the second circuit layer are respectively arranged on two sides of the substrate (7), the first circuit layer is at least provided with an inverted-F antenna (2) and a rectangular radiation patch (1), and the second circuit layer is at least provided with a curved flow line (3) and a ground (5); wherein the content of the first and second substances,
the multi-band antenna is also provided with a coaxial feeder (6), and the coaxial feeder (6) is used for feeding the inverted-F antenna (2);
the rectangular radiation patch (1) is connected with a curved flow line (3) through a through hole (4), the curved flow line (3) is connected with the ground (5), and the rectangular radiation patch (1), the inverted-F antenna (2) and the curved flow line (3) form a composite left-right hand transmission line unit; the composite left-right hand transmission line unit forms a zero-order resonance mode to generate a low-frequency band of 670-; the inverted F antenna (2) and the rectangular radiation patch (1) form a coupling structure to excite the rectangular radiation patch (1) to form a current loop, and a WiFi low-frequency band of 2.18-2.52GHz is generated to cover a 2.4GHz WiFi band; the inverted-F antenna (2) generates a WiFi high-frequency band of 4.73-6.38GHz to cover a 5.0GHz WiFi band.
2. The multiband antenna of claim 1, wherein in said composite right and left hand transmission line unit, a coupling capacitance is generated between said rectangular radiating patch (1) and a meander line (3) as a series left-hand capacitance CLThe self inductance of the inverted F antenna (2) is used as the series right-hand inductance LRThe inductance of the meander line (3) is used as the parallel left-hand inductance LLA coupling capacitor is generated between the rectangular radiation patch (1) and the inverted-F antenna (2) and is used as a parallel right-hand capacitor CR。
3. The multiband antenna of claim 2, wherein the composite right and left hand transmission line structure forms a zero order resonance mode, ωse＝ωsh＝ω0Wherein, ω is0Is the resonant frequency, omegaseIn order to be the series-resonant frequency,
ωshin order to be the parallel resonance frequency,
4. multiband antenna according to claim 1 or 2, characterized in that the impedance value of said coaxial feed (6) is 50 ohms.
5. The multiband antenna according to claim 4, wherein the coaxial feed line (6) is insulated at its outside with an insulator and closed at its bottom with a plating head.
6. The multiband antenna according to claim 4, wherein said substrate (7) is an FR4 substrate.
7. The multiple band antenna based on composite left and right hand transmission lines according to claim 1 or 2, wherein the volume of the substrate (7) is 105 x 60 x 0.8mm3, the area of the ground (5) is 90 x 60mm2, and the area of the rectangular radiating patch (1) is 19 x 4mm 2.
8. The multiband antenna according to claim 1 or 2, wherein the radius of the through hole (4) is 0.3mm, the feed probe of the coaxial feed line (6) is 0.35mm, and the radius of the coaxial feed line (6) is 0.75 mm.
9. The multiband antenna according to claim 1 or 2, wherein the width of the meander line (3) is 0.72mm, the total length of the meander line (3) is 60.6mm, and the total length of the inverted-F antenna (2) is 30 mm.
10. The multiband antenna of claim 2, wherein the series left-hand capacitor CL0.43pF, the series right hand inductor LR0.51nH, the left-hand inductance LL1.12nH, said parallel right-hand capacitor CR＝0.18pF。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920527780.3U CN209896263U (en) | 2019-04-18 | 2019-04-18 | Multi-band antenna based on composite left-right-hand transmission line |
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| CN201920527780.3U CN209896263U (en) | 2019-04-18 | 2019-04-18 | Multi-band antenna based on composite left-right-hand transmission line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212316A (en) * | 2019-04-18 | 2019-09-06 | 杭州电子科技大学富阳电子信息研究院有限公司 | A kind of multiband aerial based on composite right/left-handed transmission line |
| CN112255466A (en) * | 2020-10-18 | 2021-01-22 | 河南师范大学 | Cancellation type sensor based on mixed left-right hand transmission line |
| CN117594986A (en) * | 2023-11-01 | 2024-02-23 | 国网信息通信产业集团有限公司 | Miniaturized multiband antenna |
-
2019
- 2019-04-18 CN CN201920527780.3U patent/CN209896263U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212316A (en) * | 2019-04-18 | 2019-09-06 | 杭州电子科技大学富阳电子信息研究院有限公司 | A kind of multiband aerial based on composite right/left-handed transmission line |
| CN110212316B (en) * | 2019-04-18 | 2024-01-16 | 杭州电子科技大学富阳电子信息研究院有限公司 | Multiband antenna based on composite left-right hand transmission line |
| CN112255466A (en) * | 2020-10-18 | 2021-01-22 | 河南师范大学 | Cancellation type sensor based on mixed left-right hand transmission line |
| CN117594986A (en) * | 2023-11-01 | 2024-02-23 | 国网信息通信产业集团有限公司 | Miniaturized multiband antenna |
| CN117594986B (en) * | 2023-11-01 | 2024-06-11 | 国网信息通信产业集团有限公司 | Miniaturized multiband antenna |
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