CN112652870A - Metamaterial filter structure based on dielectric integrated suspension line - Google Patents
Metamaterial filter structure based on dielectric integrated suspension line Download PDFInfo
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- CN112652870A CN112652870A CN201910956329.8A CN201910956329A CN112652870A CN 112652870 A CN112652870 A CN 112652870A CN 201910956329 A CN201910956329 A CN 201910956329A CN 112652870 A CN112652870 A CN 112652870A
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- circuit board
- metamaterial
- integrated suspension
- dielectric
- filter structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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Abstract
The invention discloses a metamaterial filter structure based on a dielectric integrated suspension line, which comprises a dielectric integrated suspension line platform, a metamaterial structure and a filter structure, wherein the dielectric integrated suspension line platform is formed by stacking a circuit board, a circuit board and a circuit board, each layer of circuit board is formed by an upper layer of metal plate, a lower layer of metal plate and a dielectric plate in the middle of the metal plates, and the dielectric plate is FR4 or Rogers 5880; the circuit board is provided with a filtering structure, the circuit board is provided with a metamaterial structure, and the circuit board are provided with air cavities. The invention mainly has the following advantages: firstly, a filtering structure and a metamaterial structure are arranged on a medium integrated suspension line platform, so that the size of the filter is effectively reduced, and the miniaturization of the filter is realized. Secondly, the metamaterial filter structure based on the dielectric integrated suspension line has good frequency selectivity and out-of-band rejection.
Description
Technical Field
The invention relates to the technical field of radio frequency microwave circuits, in particular to a metamaterial filter structure based on a dielectric integrated suspension line.
Background
In communication systems, it is often necessary to select a particular frequency band of the electromagnetic frequency band. For example, useful information needs to be available in the receiver so that noise or interference signals that are not related to the information will be filtered out. The filter, as a two-port component, plays an important role in many rf microwave applications. As communication frequencies increase, conventional LC elements have been difficult to adapt to the needs of technological development due to size and manufacturing process issues, and the development of the communication industry has placed more stringent requirements on filters, including higher performance, smaller size, lighter weight, and easier post-fabrication packaging.
Therefore, reducing the packaging complexity after processing, reducing the size and weight of the filter, and improving the performance of the filter have become key problems.
Disclosure of Invention
Based on the requirements, the invention provides a novel metamaterial filter structure based on a dielectric integrated suspension line, and the filter realizes self-packaging, low loss and miniaturization, and has higher frequency selectivity and out-of-band rejection characteristics.
In order to achieve the purpose of the invention, the invention provides a metamaterial filter structure based on a dielectric integrated suspension line,
comprises a medium integrated suspension line platform, a metamaterial structure and a filter structure,
the dielectric integrated suspension line platform is formed by a circuit board, a circuit board stack, a circuit board stack and a dielectric plate, wherein each layer of circuit board is formed by an upper layer of metal plate and a lower layer of metal plate and the dielectric plate between the metal plates, and the dielectric plate is FR4 or Rogers 5880;
the circuit board is provided with a filtering structure, the circuit board is provided with a metamaterial structure, and the circuit board are provided with air cavities.
Wherein the shape of the air cavity is set to be square or round or irregular.
The metamaterial structure is composed of a top portion and a bottom portion of a circuit board and connecting portions connected between the two end portions, the sectional area of each connecting portion is smaller than that of the top portion and that of the bottom portion, and metal through holes connected with the top portion and the bottom portion are formed in the connecting portions.
The metamaterial structure is arranged in an I-shaped periodic array, the height of the connecting part is 1.965mm, the lengths of the top and the bottom are 2mm, and the width is 0.3 mm.
And the metamaterial structure is matched with the filtering structure on the circuit board in size.
The circuit board and the circuit board are cover plates of an air cavity, and the front and back metal layers of the circuit board can be subjected to filter structure design.
Compared with the prior art, the invention mainly has the following advantages:
firstly, a filtering structure and a metamaterial structure are arranged on a medium integrated suspension line platform, so that the size of the filter is effectively reduced, and the miniaturization of the filter is realized.
Secondly, the metamaterial filter structure based on the dielectric integrated suspension line has good frequency selectivity and out-of-band rejection, and simulation graphs of S21 and S11 are shown in FIG. 5.
Drawings
Fig. 1 is a schematic structural diagram of a metamaterial filter with dielectric integrated suspension wires according to the present application.
Fig. 2 is a schematic structural diagram of a circuit board 13 in the metamaterial filter structure of the dielectric integrated suspension wire according to the present application.
Fig. 3 is a schematic structural diagram of the circuit board 14 in the metamaterial filter structure of the dielectric integrated suspension wire according to the present application.
Fig. 4 is a sectional view of fig. 3 described above.
Fig. 5 is a simulation diagram of the S parameter of the filter of the present application.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The invention discloses a novel metamaterial filter structure based on a medium integrated suspension line, which is realized by respectively arranging a filter structure and a metamaterial structure on a medium integrated suspension line platform and finally optimizing the circuit performance to obtain a new circuit.
The core idea of the metamaterial filter structure based on the dielectric integrated suspension lines is firstly analyzed. The metamaterial filter structure based on the dielectric integrated suspension lines as shown in fig. 1 is mainly composed of a dielectric integrated suspension line platform, a metamaterial structure and a filter structure.
As shown in fig. 1, the metamaterial filter structure based on the dielectric integrated suspension line of the present invention includes a circuit board 11, a circuit board 12, a circuit board 13, a circuit board 14, a circuit board 15, and a circuit board 16, which are sequentially arranged from top to bottom; each layer of circuit board consists of an upper layer of metal plate, a lower layer of metal plate and a dielectric plate between the metal plates, and the dielectric layer is FR4 or Rogers 5880; a filtering structure is arranged on the circuit board 13; the circuit board 12 and the circuit board 15 are cut out to form an air cavity. The air cavity may be square or circular or irregular in shape. The shape of the cavity is square. The circuit board 14 is provided with a metamaterial structure.
Metamaterials are artificial materials engineered to alter the incident characteristics of electromagnetic waves on structures. Its properties are generally described in terms of permittivity and permeability. This scheme will utilize the high dielectric characteristic of metamaterial, sets up the metamaterial structure between circuit board 13 filter structure layer and circuit board 15 air cavity promptly, improves the dielectric constant of dielectric substrate, when the electromagnetic wave propagates in the circuit, can reduce the wavelength of electromagnetic wave to reduce the size of wave filter, be favorable to realizing the miniaturization of wave filter.
As shown in fig. 2, port 1 of the filter serves as an input port; port 2 serves as an output port.
As shown in fig. 3 and 4, the meta-material is composed of a top portion and a bottom portion 41 of the circuit board 14 and a connecting portion 42 connected between the two end portions, the cross-sectional area of the connecting portion is smaller than that of the top portion and the bottom portion, and the connecting portion is provided with a metal through hole for connecting the top portion and the bottom portion. The top and the bottom, namely the metal layers, are connected by arranging metal through holes on the connecting parts to form a structure with the cross sections of the two ends larger than that of the connecting parts. The metamaterial structures form I-shaped periodic array arrangement. The height of the connector was 1.965mm, the length of the top and bottom was 2mm, and the width was 0.3 mm. The metamaterial structure is matched with the size of the filtering structure on the circuit board 13. When the metamaterial structure is added below the filter structure, the metamaterial has high dielectric property, and the size of the filter structure is reduced compared with that of a common dielectric integrated suspension line filter.
The circuit board 11 and the circuit board 16 are cover plates with air cavities, the front and back metal layers of the circuit board 13 can be designed with a filter structure, the filter structure is designed on the front metal of the circuit board 13, and the front metal layer of the circuit board 13, the hollow area of the circuit board 12 and the back metal layer of the circuit board 11 jointly form an air resonant cavity. The back metal layer of the circuit board 14, the hollowed-out area of the circuit board 15 and the front metal layer of the circuit board 16 together form an air resonant cavity. The two cavity structures, the filtering structure arranged on the circuit board 13 and the metamaterial structure arranged on the circuit board 14 jointly form a complete filter, so that the size of the filter is obviously reduced to 50% of that of a common dielectric integrated suspended line filter, and the miniaturization of the filter is realized.
The final scattering parameter plot is shown in fig. 5, with the vertical axis being the scattering parameter in dB; the horizontal axis is frequency, the unit is GHz, it can be seen that the passband is generated at 3.45GHz, two transmission poles are arranged in the passband, and in addition, three transmission zeros are arranged outside the passband, so that better out-of-band rejection can be realized within a certain frequency range.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A metamaterial filter structure based on a dielectric integrated suspension line is characterized in that,
comprises a medium integrated suspension line platform, a metamaterial structure and a filter structure,
the dielectric integrated suspension line platform is formed by stacking a circuit board (11), a circuit board (12), a circuit board (13), a circuit board (14), a circuit board (15) and a circuit board (16), wherein each layer of circuit board consists of an upper layer of metal plate, a lower layer of metal plate and a dielectric plate in the middle of the metal plates, and the dielectric plate is FR4 or Rogers 5880;
the circuit board (13) is provided with a filtering structure, the circuit board (14) is provided with a metamaterial structure, and the circuit board (12) and the circuit board (15) are provided with air cavities.
2. A metamaterial filter structure based on dielectric integrated suspension wires as claimed in claim 1,
the shape of the air cavity is set to be square or round or irregular.
3. A metamaterial filter structure based on dielectric integrated suspension wires as claimed in claim 1,
the metamaterial structure is composed of a top portion and a bottom portion (41) which are arranged on a circuit board (14) and a connecting portion (42) connected between the two end portions, the sectional area of the connecting portion (42) is smaller than that of the top portion and that of the bottom portion, and the connecting portion is provided with a metal through hole for connecting the top portion and the bottom portion.
4. A metamaterial filter structure based on dielectric integrated suspension wires as claimed in claim 3,
the metamaterial structures are arranged in an I-shaped periodic array, the height of the connecting part (42) is 1.965mm, the lengths of the top and the bottom are 2mm, and the width is 0.3 mm.
5. A metamaterial filter structure based on dielectric integrated suspension wires as claimed in claim 4,
the metamaterial structure is matched with the filtering structure on the circuit board (13) in size.
6. A metamaterial filter structure based on dielectric integrated suspension wires as claimed in claim 1,
the circuit board (11) and the circuit board (16) are cover plates of an air cavity, and the metal layers on the front side and the back side of the circuit board (13) can be designed into a filtering structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910956329.8A CN112652870A (en) | 2019-10-10 | 2019-10-10 | Metamaterial filter structure based on dielectric integrated suspension line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910956329.8A CN112652870A (en) | 2019-10-10 | 2019-10-10 | Metamaterial filter structure based on dielectric integrated suspension line |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6602429B1 (en) * | 1996-02-15 | 2003-08-05 | Council For The Central Laboratory Of The Research Councils | Waveguide structures and a method of fabrication thereof |
| US20110181373A1 (en) * | 2008-07-07 | 2011-07-28 | Per-Simon Kildal | Waveguides and transmission lines in gaps between parallel conducting surfaces |
| CN102354783A (en) * | 2011-08-02 | 2012-02-15 | 南京广顺网络通信设备有限公司 | Suspending microstrip structured high and low pass combiner |
| CN102637929A (en) * | 2012-03-29 | 2012-08-15 | 南京赛格微电子科技有限公司 | Band stop filter with suspension line |
| CN103001002A (en) * | 2012-11-20 | 2013-03-27 | 深圳光启创新技术有限公司 | Metamaterial and metamaterial design method |
| CN108281798A (en) * | 2017-12-30 | 2018-07-13 | 天津大学 | A kind of cross two-dimensional left-handed material combined with hollow |
| CN108365316A (en) * | 2018-02-07 | 2018-08-03 | 电子科技大学 | Medium based on Meta Materials integrates suspended substrate stripline structure |
| CN109037867A (en) * | 2018-08-23 | 2018-12-18 | 电子科技大学 | The patch filter structure of suspended substrate stripline is integrated based on medium |
-
2019
- 2019-10-10 CN CN201910956329.8A patent/CN112652870A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6602429B1 (en) * | 1996-02-15 | 2003-08-05 | Council For The Central Laboratory Of The Research Councils | Waveguide structures and a method of fabrication thereof |
| US20110181373A1 (en) * | 2008-07-07 | 2011-07-28 | Per-Simon Kildal | Waveguides and transmission lines in gaps between parallel conducting surfaces |
| CN102354783A (en) * | 2011-08-02 | 2012-02-15 | 南京广顺网络通信设备有限公司 | Suspending microstrip structured high and low pass combiner |
| CN102637929A (en) * | 2012-03-29 | 2012-08-15 | 南京赛格微电子科技有限公司 | Band stop filter with suspension line |
| CN103001002A (en) * | 2012-11-20 | 2013-03-27 | 深圳光启创新技术有限公司 | Metamaterial and metamaterial design method |
| CN108281798A (en) * | 2017-12-30 | 2018-07-13 | 天津大学 | A kind of cross two-dimensional left-handed material combined with hollow |
| CN108365316A (en) * | 2018-02-07 | 2018-08-03 | 电子科技大学 | Medium based on Meta Materials integrates suspended substrate stripline structure |
| CN109037867A (en) * | 2018-08-23 | 2018-12-18 | 电子科技大学 | The patch filter structure of suspended substrate stripline is integrated based on medium |
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Application publication date: 20210413 |