CN110212316B - Multiband antenna based on composite left-right hand transmission line - Google Patents
Multiband antenna based on composite left-right hand transmission line Download PDFInfo
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- CN110212316B CN110212316B CN201910312066.7A CN201910312066A CN110212316B CN 110212316 B CN110212316 B CN 110212316B CN 201910312066 A CN201910312066 A CN 201910312066A CN 110212316 B CN110212316 B CN 110212316B
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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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
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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
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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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a multi-band antenna based on a composite left-right hand transmission line, which consists of a coaxial feeder, a rectangular radiation patch, a through hole, an inverted F antenna, a meander line, a ground and an FR4 substrate; the antenna comprises a rectangular radiation patch, an inverted F antenna and a curved line, wherein the rectangular radiation patch, the inverted F antenna and the curved line form a composite left-right hand transmission line structure, a zero-order resonance mode is formed by the composite left-right hand transmission line structure to generate a low-frequency wave band (670-747 GHz) so as to cover LTE band 12 (698-746 GHz), the inverted F antenna and the rectangular patch form a coupling structure to generate a WiFi low-frequency wave band (2.18-2.52 GHz) so as to cover a 2.4GHzWiFi wave band, the inverted F antenna generates a WiFi high-frequency wave band (4.73-6.38 GHz) so as to cover a 5.0GHz WiFi wave band, and due to the existence of the zero-order resonance mode, the antenna is small enough in size, the antenna is small in actual volume, easy to integrate and process, and the maximum gain in the whole frequency band reaches 9.17dB, and can be applied to a mobile phone antenna.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a multiband antenna based on a composite left-right hand transmission line, which is a compact and miniaturized WiFi antenna based on a CRLH-TL ZOR (composite left-right hand material transmission line-zero order resonance) structure to form a multiband so as to cover double frequency bands of LTE band 12 (698-746 GHz) and WiFi 2.4GHz and 5.0 GHz.
Background
In recent years, due to the continuous progress of the technological age, the demand of people for portable mobile communication is improved, and meanwhile, the rapid wireless transmission of a large amount of information such as images, videos and the like is also faster and faster in the development of wireless communication systems at home and abroad. As a front-end device that transmits and receives electromagnetic wave signals, an antenna plays a very important role in a radio system. Meanwhile, with the rapid development of science and technology and the arrival of the information age, antennas are continuously developed toward multifrequency, miniaturization and broadband. Conventional antennas have become increasingly difficult to meet, and in the new and complex technological setting, more and more wireless communication technologies may need to use multiple frequencies at the same time, or multiple communication systems in a fixed space, and may need to operate in different frequency bands and modes. If the needs of these numerous wireless communication systems can be met with one or few antennas, the need for a high performance multi-frequency antenna can be raised by avoiding the need to install a large number of antennas operating in different frequency bands. Meanwhile, with the rapid development of wireless communication technology and the improvement of processing technology, the demands for mobility and portability of wireless communication devices are also increasing. On the premise of ensuring the radiation characteristics of the antenna, the size of the antenna is reduced, so that the communication equipment is promoted to be continuously integrated, and the integration is gradually advanced, and the antenna is still another key point and difficulty in the design of the antenna in recent years. The antenna size decreases, resulting in a decrease in radiation resistance, and an increase in the imaginary part of the input impedance of the antenna, which makes it difficult to match with a conventional transmission line. The conventional loading of the antenna can improve the input impedance characteristic of the antenna to a certain extent, but the loading tends to occupy a certain space to form an excessive volume, so the contribution to miniaturization of the antenna is limited. This means that new approaches must be sought to develop antenna miniaturization techniques to accommodate the needs of wireless communication systems.
In order to adapt to the rapid development of the current broadband connection, the requirements of people on the stability and the rapidness of wireless connection are met, the current 5GHzWiFi technology is provided, the original 2.4GHz is added, the current WiFi dual-band is formed, according to the international IEEE 802.11b/g and IEEE 802.11ac/n protocol standards, the WiFi low-frequency working range is 2.4-2.4825GHz, the high-frequency working range is 5.15-5.825GHz, in view of the defect that the antenna size suitable for the WiFi high-frequency band is large at present, meanwhile, the traditional composite left-right hand transmission line structure antenna is mostly designed in dual-band, only two bands or one band and other bands in the invention can be covered, and a scheme is necessary to be studied to solve the defect.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to propose a design concept of a multi-band miniaturized resonant antenna, which is realized by compounding a left-hand and right-hand transmission line structure to generate a zero-order resonant structure.
In order to solve the technical problems in the prior art, the technical scheme of the invention is as follows:
the multi-band antenna based on the composite left-right hand transmission line comprises a substrate (7), and a first circuit layer and a second circuit layer which are respectively arranged 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 curved line (3) and a ground (5); wherein,
the multi-band antenna is further 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 the curved line (3) through the through hole (4), the curved line (3) is connected with the ground (5), and the rectangular radiation patch (1), the inverted F antenna (2) and the curved 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 (670-747 GHz) so as to cover LTE band 12 (698-746 GHz); 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 (2.18-2.52 GHz) is generated to cover a 2.4GHzWiFi band; the inverted-F antenna (2) generates a WiFi high-frequency band (4.73-6.38 GHz) 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) to serve as a series left-hand capacitor C L The self inductance of the inverted F antenna (2) is used as a series right-hand inductance L R The inductance of the meander line (3) is used as the parallel left-hand inductance L L A coupling capacitor is generated between the rectangular radiation patch (1) and the inverted F antenna (2) and is used as a right flashlight capacitor C in parallel connection R 。
As a further improvement, omega is formed when the composite left-right hand transmission line structure forms a zero order resonance mode se ＝ω sh ＝ω 0 Wherein ω is 0 Is the resonant frequency omega se For the series resonant frequency,
ω sh for the parallel resonant frequency,
as a further development, the impedance value of the coaxial feed line (6) is 50 ohms.
As a further development, the outside of the coaxial feeder (6) is insulated with an insulator, the bottom of which is closed with a plating head.
As a further improvement, the substrate (7) is 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 19×4mm2.
As a further improvement, the radius of the through hole (4) is 0.3mm, the feeding probe of the coaxial feeder (6) is 0.35mm, and the radius of the coaxial feeder (6) is 0.75mm.
As a further development, 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 30mm.
As a further improvement scheme, the serial left hand capacitor C L =0.43 pF, the series right hand inductance L R =0.51 nH, the parallel left hand inductance L L =1.12 nH, the parallel right hand capacitor C R ＝0.18pF。
Compared with the prior art, the invention forms a composite left-right hand transmission line unit by loading the rectangular radiation patch, the curved line and the inverted F antenna, forms zero-order resonance frequency, reduces the size of the antenna and realizes compactness under the condition of not affecting or improving the performance of the antenna by utilizing the characteristics of the structure; the invention can cover more frequency bands on the premise of not increasing the manufacturing cost and the process complexity. While the zero-order resonant frequency mode is adopted to cover the LTE band 12 (698-746 GHz) wave band, two resonant frequencies of 2.4GHz and 5.0GHz can be generated to cover the WiFi wave band. The maximum gain of the invention in the whole frequency band reaches 9.17dB, and compared with the similar antenna, the gain is obviously improved.
Drawings
Fig. 1 is a general structure diagram of a multiband antenna according to the present invention based on a composite right-and-left-handed transmission line, wherein the left side is the front side (first circuit layer) of a substrate, and the right side is the back side (second circuit layer) of the substrate.
Fig. 2 is a schematic diagram of the structure of the practical antenna size part of the present invention.
Fig. 3 is an equivalent circuit diagram of a composite right and left hand transmission line unit of the present invention.
Fig. 4 is a schematic diagram of the return loss s11 parameter in a preferred embodiment of the present invention.
Fig. 5 is a 2D pattern of the antenna at a resonant frequency of 0.7GHz in a preferred embodiment of the invention.
Fig. 6 is a 2D pattern of the antenna at a resonant frequency of 2.45GHz in a preferred embodiment of the invention.
Fig. 7 is a 2D pattern of the antenna at a resonant frequency of 5.0GHz in a preferred embodiment of the invention.
Detailed Description
The technical scheme provided by the invention is further described below with reference to the accompanying drawings.
Referring to fig. 1-2, a block diagram of a multi-band antenna based on a composite left-right hand transmission line is shown, which comprises a substrate (7), and a first circuit layer and a second circuit layer which are respectively arranged 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 curved 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 a meander line (3) through a through hole (4), the meander line (3) is connected with the ground (5), the rectangular radiation patch (1), the inverted F antenna (2) and the meander 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 wave band (670-747 GHz) so as to cover LTE band 12 (698-746 GHz); 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 (2.18-2.52 GHz) is generated to cover a 2.4GHzWiFi band; the inverted-F antenna (2) generates a WiFi high-frequency band (4.73-6.38 GHz) to cover the 5.0GHz WiFi band.
In a preferred embodiment, the coaxial feeder is insulated outside the coaxial line by using an insulator during simulation, so that the influence of the insulator on the radiation of the antenna is avoided, the bottom of the coaxial line is sealed by using a plating head, and the downward leakage of the electromagnetic field of the coaxial line is avoided.
Referring to FIG. 3, there is shown therein a complexThe equivalent circuit diagram of the right-hand transmission line unit is shown in figure 3, and a coupling capacitor is generated between the rectangular radiation patch (1) and the meander line (3) to serve as a series connection left-hand capacitor C L The self inductance of the inverted F antenna (2) is used as a series right-hand inductance L R The inductance of the meander line (3) is used as the parallel left-hand inductance L L A coupling capacitor is generated between the rectangular radiation patch (1) and the inverted F antenna (2) and is used as a right flashlight capacitor C in parallel connection R 。
As shown in fig. 3, a section of composite left and right hand transmission line structure unit with length deltaz is connected in series with a left hand inductance and then connected in series with a right hand inductance, then connected in parallel with a right hand inductance and then connected in parallel with a left hand inductance, and finally output from a voltage output end.
In the technical scheme, the composite left-right hand structure is the main radiation structure, two frequency bands are additionally generated while the area of the antenna is reduced, so that multiple frequency bands are realized, and the length of the branch knot can be adjusted to expand the high frequency bandwidth of the inverted-F antenna due to the application of the inverted-F antenna, so that the high frequency 5.0GHz wide frequency band is realized. Meanwhile, because of the existence of the zero-order resonance mode, the electric field is in plane distribution, 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 transmission line and the right-hand transmission line, and therefore the size of the microstrip antenna can break through the limit of lambda/4 wavelength, and the miniaturization of the antenna is realized.
The technical principle of the invention is described in detail below:
as shown in fig. 3, for a uniform and lossless transmission line, the phase constant is:
where S (ω) is a sign function:
wherein the series and parallel resonant frequencies
The phase constants of the composite left-and right-handed transmission line are discussed below in terms of different frequency bins:
when omega > omega Γ2 In the time-course of which the first and second contact surfaces,
the composite left-and right-handed transmission line now exhibits right-handed transmission line characteristics.
When omega < omega Γ2 Time of day
The composite left-right hand transmission line now exhibits a left hand transmission characteristic.
When omega Γ1 ＜ω＜ω Γ2 In the time-course of which the first and second contact surfaces,
the composite left-hand and right-hand transmission line is in a band gap mode, which is unique to the composite left-hand and right-hand transmission line, and the above-mentioned two are unbalanced, and one special case is considered, namely when ω se ＝ω sh This condition is called the equilibrium condition when L R C L ＝L L C R In this case zero order resonant modes are created. Wherein the resonant frequency
(unbalanced case)
(equilibrium case)
The resonance frequency is only related to the reactance parameter of the structural unit, and is not related to the physical size of the resonator itself, when beta >0, that is, when n takes different positive values +1, +2 …, the transmission line will show right-hand transmission line characteristics, resulting in a higher resonance frequency. Specifically, the composite left-right hand transmission line has β=0 (crossover frequency) and β <0 (left-hand attribute frequency range) and β >0 (right-hand attribute frequency range), so its electrical length θ may be greater than zero, zero or even less than zero, and the resonant orders n and 0 are symmetrical. The structural length L and the corresponding resonant frequency ωn or electrical length θ or half wavelength have the following relationship:
or->
Where n=0, ±1, ±2, ±3, …,
where m and βn are the resonant order and phase constant, respectively. Similar to a conventional transmission line, different resonant frequency values can be obtained by sampling the dispersion curve graph with pi/d speed on the abscissa β/pi. Likewise, the frequency bandwidth of the uniform and lossless composite left and right hand transmission line is infinity [ omega ] [ E ] [0, ], then the corresponding resonator will have infinite order resonance. At the same time, the size of the zero-order resonant mode can be miniaturized. Resonators formed by composite left-and right-hand transmission lines have essentially multifrequency characteristics, as do antennas designed with such composite left-and right-hand transmission line structures.
As can be seen from the above series-parallel resonant frequency formula, when the series reactance parameter (L R 、C L ) Or shunt reactance parameter (L) of an open-ended zero-order resonant antenna L 、C R ) The resonant frequency will also change, i.e. the resonant frequency of the antenna can be made by changing the reactance parameter corresponding to the physical size of the antennaThe rate is adjustable within a certain range.
The invention forms a composite left-right hand structure by etching a metal patch structure on a substrate, wherein the metal patch structure comprises a rectangular radiation patch, a through hole, an inverted F antenna, a curved line and a ground, a low-frequency band is generated by utilizing the zero-order resonance characteristic of the composite left-right hand structure to cover LTE band 12 (698-746 GHz), and a high-frequency band is generated by utilizing the interaction of the inverted F antenna and the rectangular radiation patch and the radiation effect of the inverted F antenna to cover 2.4GHz and 5.0GHzWiFi bands.
In the technical scheme of the invention, the size of the antenna is small enough due to the existence of the zero-order resonance mode, the substrate adopts a 0.8mmFR-4 dielectric plate, the dielectric loss is 4.4, and in a preferred embodiment, the actual volume of the prepared antenna is 15 x 21.7 x 0.8mm3, the volume is small, the integrated processing is easy, the maximum gain in the whole frequency band reaches 9.17dB, and the antenna can be applied to a mobile phone antenna. The specific structural parameters are that the volume of a substrate is 105 x 60 x 0.8mm3, the area of a system ground is 90 x 60mm2, the area of a rectangular radiation patch is 19 x 4mm2, the radius of a through hole is 0.3mm, a coaxial line feed probe is 0.35mm, the radius of a coaxial line is 0.75mm, the width of a meander line is 0.72mm, the total length of a meander line is 60.6mm, the total length of an inverted-F antenna is 30mm, and the equivalent circuit parameters are as follows: l (L) R ＝0.51nH,C L ＝0.43pF,L L ＝1.12nH,C R ＝0.18pF。
In the above parameter design, the schematic diagram of the return loss s11 parameter is shown in fig. 4. The invention can adjust the resonant frequency of the antenna within a certain range by changing reactance parameters, the composite left-right hand structure is the main radiation structure of the invention, two frequency bands are additionally generated while the area of the antenna is reduced, the multi-frequency band is realized, and the length of the branch knot can be adjusted to expand the high frequency bandwidth of the inverted F antenna due to the application of the inverted F antenna, so that the wide frequency band of high frequency 5.0GHz is realized. The 2D directional diagrams of the resonance frequency points are shown in figures 5, 6 and 7, so that omnidirectional radiation can be seen at low frequency, and the directivity is good. A few split lobes appear at high frequencies, which is allowed for the handset antenna.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following 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 multi-band antenna based on the composite left-right hand transmission line 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 line (3) and a ground (5); wherein,
the multi-band antenna is further 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 the curved line (3) through the through hole (4), the curved line (3) is connected with the ground (5), and the rectangular radiation patch (1), the inverted F antenna (2) and the curved 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 670-747GHz so as to cover an LTE band 12 frequency band 698-746GHz; 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 2.4GHzWiFi band; the inverted-F antenna (2) generates WiFi high-frequency bands of 4.73-6.38GHz to cover the 5.0GHz WiFi band.
2. The multi-band antenna based on a composite right-and-left hand transmission line according to claim 1,the composite left-right hand transmission line unit is characterized in that a coupling capacitor is generated between the rectangular radiation patch (1) and the curved line (3) to serve as a series left-hand capacitor C L The self inductance of the inverted F antenna (2) is used as a series right-hand inductance L R The inductance of the meander line (3) is used as the parallel left-hand inductance L L A coupling capacitor is generated between the rectangular radiation patch (1) and the inverted F antenna (2) and is used as a right flashlight capacitor C in parallel connection R 。
3. The multiple band antenna based on composite left-right hand transmission line according to claim 2, wherein ω when the composite left-right hand transmission line structure forms a zero order resonant mode se ＝ω sh ＝ω 0 Wherein ω is 0 Is the resonant frequency omega se For the series resonant frequency,
ω sh for the parallel resonant frequency,
4. multiband antenna based on a composite right-and left-hand transmission line according to claim 1 or 2, characterized in that the impedance value of the coaxial feed line (6) is 50 ohms.
5. The multiband antenna based on a composite right-and-left hand transmission line according to claim 4, characterized in that the outside of the coaxial feeder (6) is insulated with an insulator, the bottom of which is closed with a plating head.
6. The multiband antenna based on a composite right-and-left-handed transmission line according to claim 4, characterized in that the substrate (7) is an FR4 substrate.
7. Multi-band antenna based on composite left-right hand transmission line according to claim 1 or 2Characterized in that the volume of the substrate (7) is 105 x 60 x 0.8mm 3 The area of the ground (5) is 90 x 60mm 2 The area of the rectangular radiation patch (1) is 19 x 4mm 2 。
8. The multiband antenna based on a composite right-and-left hand transmission line according to claim 1 or 2, characterized in that 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 0.75mm.
9. The multiband antenna based on a composite right-and-left-handed transmission line according to claim 1 or 2, characterized in that 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 30mm.
10. The multiple band antenna based on the composite right and left hand transmission line according to claim 2, wherein the series connection left hand capacitor C L =0.43 pF, the series right hand inductance L R =0.51 nH, the parallel left hand inductance L L =1.12 nH, the parallel right hand capacitor C R ＝0.18pF。
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| CN113098464B (en) * | 2021-03-29 | 2021-11-30 | 杭州电子科技大学 | Delay line circuit with high delay precision and wide delay adjusting range |
| 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 |
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