CN108306087B - Double-frequency transmission line and double-frequency leaky-wave antenna thereof - Google Patents
Double-frequency transmission line and double-frequency leaky-wave antenna thereof Download PDFInfo
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- CN108306087B CN108306087B CN201711274740.4A CN201711274740A CN108306087B CN 108306087 B CN108306087 B CN 108306087B CN 201711274740 A CN201711274740 A CN 201711274740A CN 108306087 B CN108306087 B CN 108306087B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/18—Waveguides; Transmission lines of the waveguide type built-up from several layers to increase operating surface, i.e. alternately conductive and dielectric layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/206—Microstrip transmission line antennas
Abstract
The invention discloses a dual-frequency transmission line and a dual-frequency leaky-wave antenna thereof, wherein the dual-frequency transmission line comprises: the upper medium substrate and the lower medium substrate are arranged from top to bottom in sequence; the lower dielectric substrate is integrated with a metal layer; the upper medium substrate is provided with a substrate integrated waveguide; the substrate integrated waveguide comprises a metal strip integrated on the upper dielectric substrate and metalized holes etched on two sides of the metal strip, wherein the metalized holes on two sides of the metal strip extend along two ends of the metal strip respectively. The invention can work in microwave and millimeter wave frequency band and has large frequency ratio.
Description
Technical Field
The invention relates to the field of electronics and communication information, in particular to a double-frequency transmission line and a double-frequency leaky-wave antenna thereof.
Background
In modern wireless communication systems, dual-band or multi-band antennas play a crucial role, since they save the space occupied by the antennas, thereby contributing to a reduction in the size of the entire antenna system. At present, the working frequency band of a large number of wireless devices is only designed in the low-frequency microwave frequency band, but with the rapid development of the current millimeter wave technology, microwave millimeter waves can be simultaneously applied to wireless communication, so that the devices obtain better performance. Therefore, an antenna unit capable of simultaneously operating in the microwave and millimeter wave frequency bands will be a good choice for future applications. Leaky-wave antennas have been the focus of research by researchers due to their unique beam scanning characteristics and simple feed structures. In recent years, various leaky-wave antennas have been designed by using planar transmission lines (microstrip lines, substrate integrated waveguides). These leaky-wave antennas have the advantages of low profile, easy integration, low cost, etc., and are widely used in wireless devices, and at present, leaky-wave antennas are also used in fifth generation (5G) mobile communications, and although dual-frequency leaky-wave antennas have been designed, the frequency ratio between two operating frequency bands is only about 2, even less than 2.
Therefore, the design of the dual-frequency leaky-wave antenna with a large frequency ratio has important significance for wireless application.
Disclosure of Invention
The invention aims to provide a dual-frequency transmission line and a dual-frequency leaky-wave antenna thereof, which can simultaneously work in a microwave and millimeter wave frequency band and have a large frequency ratio.
In order to achieve the purpose, the invention adopts the following technical scheme: a dual-frequency transmission line comprises an upper dielectric substrate and a lower dielectric substrate which are arranged in sequence from top to bottom;
the lower dielectric substrate is integrated with a metal layer;
the upper medium substrate is integrated with a substrate integrated waveguide; wherein the content of the first and second substances,
the substrate integrated waveguide comprises a metal strip integrated on the upper dielectric substrate and metalized holes etched on two sides of the metal strip, wherein the metalized holes on two sides of the metal strip extend along two ends of the metal strip respectively.
Preferably, the thickness of the upper dielectric substrate is smaller than that of the lower dielectric substrate.
Preferably, both ends of the metal strip are provided with feed structures, and the feed structures comprise
A first port and a second port for low frequency feeding;
a third port for high frequency feeding and a fourth port.
Preferably, the first port inputs energy to the second port, and then the energy is fed into the dual-frequency transmission line.
Preferably, the input energy of the third port is transmitted to the fourth port, and then fed into the dual-frequency transmission line.
A dual-frequency leaky-wave antenna comprises an upper dielectric substrate and a lower dielectric substrate which are arranged from top to bottom in sequence;
the lower dielectric substrate is integrated with a metal layer;
the upper medium substrate is provided with a substrate integrated waveguide; wherein the content of the first and second substances,
the substrate integrated waveguide comprises a metal strip integrated on the upper dielectric substrate and metalized holes etched on two sides of the metal strip, wherein the metalized holes on two sides of the metal strip extend along two ends of the metal strip respectively;
the middle part of the metal strip is etched with a slot array which is arranged periodically and extends along the two ends of the metal strip;
and the bottom of the upper layer dielectric substrate or the top of the lower layer dielectric substrate is etched with a patch array, and the patch arrays are positioned on two sides of the substrate integrated waveguide.
Preferably, the thickness of the upper dielectric substrate is smaller than that of the lower dielectric substrate.
Preferably, both ends of the metal strip are provided with feed structures, and the feed structures comprise
A first port and a second port for low frequency feeding;
a third port for high frequency feeding and a fourth port.
Preferably, the energy input from the first port is transmitted to the second port, and then fed into the dual-band leaky-wave antenna.
Preferably, the energy input from the third port is transmitted to the fourth port, and then fed into the dual-band leaky-wave antenna.
The invention has the following beneficial effects:
the technical scheme of the invention has the advantages of clear principle and simple design, can simultaneously work in microwave and millimeter wave frequency bands, has large frequency ratio, can flexibly adjust the frequency ratio between the two working frequency bands by changing the dielectric constant of the upper dielectric substrate, and has compact structure, high integration level and easy processing and realization.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an upper dielectric substrate and a lower dielectric substrate in this embodiment;
fig. 2 shows a schematic structural diagram of the slot array and the metallized holes in the present embodiment;
fig. 3 shows a schematic configuration diagram of a feeding structure in the present embodiment;
FIG. 4 is a test chart showing the result of the S parameter of the dual-band transmission line in the present embodiment;
FIG. 5 is a test chart showing the propagation constant results of the dual-frequency transmission line in the present embodiment;
fig. 6 shows a test chart of the S parameter result of the dual-band leaky-wave antenna in the embodiment;
fig. 7 shows a main beam scannable angle test chart of the dual-frequency leaky-wave antenna in the embodiment at low frequency;
fig. 8 shows a main beam scannable angle test chart of the dual-frequency leaky-wave antenna in the embodiment at high frequency.
In the figure: 1. an upper dielectric substrate; 2. a lower dielectric substrate; 3. a metal strip; 4. metallizing the hole; 5. a metal layer; 6. a first port; 7. a second port; 8. a third port; 9. a fourth port; 10. a slot array; 11. an array of patches.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
A dual-frequency transmission line comprises an upper dielectric substrate 1 and a lower dielectric substrate 2 which are sequentially arranged from top to bottom, wherein the thickness of the upper dielectric substrate 1 is smaller than that of the lower dielectric substrate 2, a metal layer 5 is integrated on the lower dielectric substrate 2, a substrate integrated waveguide is arranged on the upper dielectric substrate 1 and comprises a metal strip 3 integrated on the upper dielectric substrate 1 and metalized holes 4 etched on two sides of the metal strip 3, the metalized holes 4 on two sides of the metal strip 3 respectively extend along two ends of the metal strip 3, a feed structure is further arranged on the dual-frequency transmission line and respectively located at two ends of the metal strip 3, and the feed structure comprises a first port 6 and a second port 7 which are used for low-frequency feed; a third port 8 for high frequency feeding and a fourth port 9. The first port 6 inputs energy and transmits the energy to the second port 7, and then feeds the energy into a double-frequency transmission line; the input energy from the third port 8 is transmitted to the fourth port 9 and fed into the dual-frequency transmission line.
The TE10 mode is transmitted through a substrate integrated waveguide formed by metal strips 3 and metallized holes 4 integrated on an upper dielectric substrate 1, and the substrate integrated waveguide works at high frequency; the substrate integrated waveguide and the lower dielectric substrate 2 integrated with the metal layer 5 form a traditional microstrip transmission line to transmit a TEM mode and work at a low frequency, so that the dual-frequency transmission line can simultaneously transmit microwaves and millimeter waves.
The dual-frequency transmission line can not only transmit microwave and millimeter wave at the same time, but also has large frequency ratio, so a dual-frequency leaky-wave antenna can be designed based on the structure of the dual-frequency transmission line, which comprises a slot array 10 etched periodically on a metal strip 3 integrated on a substrate integrated waveguide and forms a leaky-wave antenna working at high frequency together with the substrate integrated waveguide; and the patch arrays 11 positioned at two sides of the substrate integrated waveguide are etched at the bottom of the upper dielectric substrate 1 or at the top of the lower dielectric substrate 2, and form a leaky-wave antenna working at low frequency together with the microstrip transmission line.
Next, the dual-frequency transmission line of the present embodiment is tested by a network analyzer, from the S parameter of the dual-frequency transmission line in fig. 4 and the propagation constant result in fig. 5, it can be seen that the dual-frequency transmission line of the present embodiment has excellent transmission broadband and low loss characteristics, and the propagation constant of the dual-frequency transmission line and the high-frequency broadband are influenced by the dielectric constant of the upper dielectric substrate 11, from the S parameter result in fig. 6, the dual-frequency leaky wave antenna of the present embodiment can be obtained, from the test result, it can be seen that | S11| is lower than-10 dB in the frequency band ranges of 5.6GHz to 8.6GHz and 35GHz to 40GHz, and the respective insertion loss | S21| is not greater than-6 dB and-25 dB, from fig. 7, the dual-frequency leaky wave antenna of the present embodiment can scan the main beam at low frequency in the angle range of-64 degrees to 0 degrees, as can be seen from fig. 8, the scanning angle range of the main beam of the dual-frequency leaky-wave antenna in the present embodiment is 11 degrees to 70 degrees at high frequency.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. A dual-frequency transmission line is characterized by comprising an upper dielectric substrate (1) and a lower dielectric substrate (2) which are sequentially arranged from top to bottom;
the lower dielectric substrate (2) is integrated with a metal layer (5);
the upper dielectric substrate (1) is integrated with a substrate integrated waveguide; wherein the content of the first and second substances,
the substrate integrated waveguide comprises a metal strip (3) integrated on the upper dielectric substrate (1) and metallized holes (4) etched on two sides of the metal strip (3), wherein the metallized holes (4) on two sides of the metal strip (3) respectively extend along two ends of the metal strip (3);
the high-frequency operation is realized through a substrate integrated waveguide formed by a metal strip (3) and a metallized hole (4) which are integrated on an upper dielectric substrate (1);
the low-frequency operation is realized by forming a microstrip transmission line by the substrate integrated waveguide and the lower dielectric substrate (2) integrated with the metal layer (5);
both ends of the metal strip (3) are provided with feed structures, and each feed structure comprises
A first port (6) for low frequency feeding and a second port (7);
a third port (8) for high frequency feeding and a fourth port (9).
2. The dual-frequency transmission line according to claim 1, characterized in that the thickness of the upper dielectric substrate (1) is smaller than the lower dielectric substrate (2).
3. The dual-frequency transmission line according to claim 1, characterized in that the first port (6) inputs energy to the second port (7) to feed the dual-frequency transmission line.
4. The dual-frequency transmission line according to claim 1, characterized in that the third port (8) inputs energy to the fourth port (9) to feed the dual-frequency transmission line.
5. A dual-frequency leaky-wave antenna is characterized by comprising an upper dielectric substrate (1) and a lower dielectric substrate (2) which are sequentially arranged from top to bottom;
the lower dielectric substrate (2) is integrated with a metal layer (5);
the upper dielectric substrate (1) is provided with a substrate integrated waveguide; wherein the content of the first and second substances,
the substrate integrated waveguide comprises a metal strip (3) integrated on the upper dielectric substrate (1) and metallized holes (4) etched on two sides of the metal strip (3), wherein the metallized holes (4) on two sides of the metal strip (3) respectively extend along two ends of the metal strip (3);
the middle part of the metal strip (3) is etched with a slit array (10) which is arranged periodically and extends along the two ends of the metal strip (3);
a patch array (11) is etched on the bottom of the upper dielectric substrate (1) or the top of the lower dielectric substrate (2), and the patch array (11) is positioned on two sides of the substrate integrated waveguide;
the high-frequency operation is realized through a substrate integrated waveguide formed by a metal strip (3) and a metallized hole (4) which are integrated on an upper dielectric substrate (1);
the low-frequency operation is realized by forming a microstrip transmission line by the substrate integrated waveguide and the lower dielectric substrate (2) integrated with the metal layer (5).
6. A dual-band leaky-wave antenna as claimed in claim 5, characterized in that said upper dielectric substrate (1) has a smaller thickness than said lower dielectric substrate (2).
7. The dual-band leaky-wave antenna as claimed in claim 5, wherein a feed structure is provided at both ends of said metal strip (3), said feed structure comprising
A first port (6) for low frequency feeding and a second port (7);
a third port (8) for high frequency feeding and a fourth port (9).
8. A dual-band leaky-wave antenna as claimed in claim 7, characterized in that said first port (6) inputs energy to said second port (7) to feed said dual-band leaky-wave antenna.
9. A dual-band leaky-wave antenna as claimed in claim 7, characterized in that input energy from said third port (8) is transmitted to said fourth port (9) and fed into said dual-band leaky-wave antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711274740.4A CN108306087B (en) | 2017-12-06 | 2017-12-06 | Double-frequency transmission line and double-frequency leaky-wave antenna thereof |
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| CN201711274740.4A CN108306087B (en) | 2017-12-06 | 2017-12-06 | Double-frequency transmission line and double-frequency leaky-wave antenna thereof |
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| CN108306087A CN108306087A (en) | 2018-07-20 |
| CN108306087B true CN108306087B (en) | 2020-03-31 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11300656B2 (en) | 2018-07-25 | 2022-04-12 | Nanyang Technological University | Radar sensor |
| CN110085990A (en) * | 2019-05-05 | 2019-08-02 | 南京邮电大学 | A kind of composite left-and-right-hand leaky-wave antenna minimizing continuous beam scanning |
| CN112768921B (en) * | 2020-12-30 | 2022-07-29 | 杭州电子科技大学 | High-scanning-rate leaky-wave antenna based on metamaterial unit |
| CN114336019B (en) * | 2021-12-15 | 2022-12-16 | 华南理工大学 | 5G large-frequency-ratio beam scanning antenna with co-radiator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268981A (en) * | 2013-05-14 | 2013-08-28 | 中国科学院深圳先进技术研究院 | Planar patch antenna for substrate integration waveguide slotting coupled feeding |
| CN107317080A (en) * | 2017-06-15 | 2017-11-03 | 云南大学 | Inexpensive microstrip line encapsulation based on the integrated gap waveguide of substrate |
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2017
- 2017-12-06 CN CN201711274740.4A patent/CN108306087B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268981A (en) * | 2013-05-14 | 2013-08-28 | 中国科学院深圳先进技术研究院 | Planar patch antenna for substrate integration waveguide slotting coupled feeding |
| CN107317080A (en) * | 2017-06-15 | 2017-11-03 | 云南大学 | Inexpensive microstrip line encapsulation based on the integrated gap waveguide of substrate |
Non-Patent Citations (1)
| Title |
|---|
| "Performance Calculation of Leaky-Wave Antenna Based on Substrate Integrated Waveguide with Transverse Slots";Renat R. Abdullin等;《2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)》;20151104;第2-6栏 * |
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