CN209929453U - Novel planar integrated dual-band filter - Google Patents
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- CN209929453U CN209929453U CN201920112164.1U CN201920112164U CN209929453U CN 209929453 U CN209929453 U CN 209929453U CN 201920112164 U CN201920112164 U CN 201920112164U CN 209929453 U CN209929453 U CN 209929453U
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The utility model relates to a novel integrated dual band filter in plane, this wave filter contain the three-layer dielectric plate that bonds together. The upper surface of the bottom dielectric plate is printed with a metal layer, the metal layer is provided with a rectangular gap, two ends of the metal layer are respectively connected with a transition gradual change line and a feed microstrip line, the lower surface of the metal layer is printed with a grounding metal layer, and two sides and the middle of the bottom dielectric plate are respectively provided with periodic metal through holes, so that the SIW filter is realized; a metal layer is printed on the upper surface of the top dielectric plate, a metal circular patch is printed on the lower surface of the top dielectric plate, and periodic metal through holes are punched in the dielectric plate to form an artificial magnetic conductor structure; the middle dielectric plate separates the top dielectric plate from the bottom dielectric plate. The utility model discloses a with the dual band filter of AMC encapsulation, solved the problem that has radiation loss and plane wave among the traditional wave filter, have advantages such as the size is little and stable in structure simultaneously.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to novel integrated dual band filter in plane.
Background
The microwave multi-passband filter is a vital component in a modern wireless communication system, and with the rapid development of a microwave integrated circuit and the increasing shortage of spectrum resources, the whole system is developed towards miniaturization and high performance, which puts higher requirements on the performance and the size of the filter in the wireless communication system. However, the early filter adopts a simple parallel connection or cascade connection mode, so that the size of the filter is greatly increased, and meanwhile, the transmission loss is large.
Substrate Integrated Waveguide (SIW) is a Waveguide-like structure composed of a dielectric Substrate, upper and lower metal surfaces, and metallized through holes, and has the excellent characteristics of small volume, low cost, easy processing and integration, which makes it widely used in the design of filters. In the design of a Substrate Integrated Waveguide (SIW) filter, the formation of stopbands by slotting the upper and lower metal surfaces thereof is an important method for designing the filter. Thus, it is difficult for a Substrate Integrated Waveguide (SIW) filter having slots on upper and lower metal surfaces to form a closed waveguide structure, which cannot effectively suppress spatial radiation and plane waves. SIW transport TE10Waves, when integrated with microstrip lines, require mode conversion, generating mode conversion losses; packaging is required to suppress spatial radiation and surface waves when filters are fabricated using SIW planar waveguide technology.
The utility model relates to a novel integrated dual band filter in plane not only can restrain space radiation and plane wave, forms a novel integrated dual band filter in plane, helps realizing the high performance price/performance ratio of high performance and small-size circuit design moreover. Meanwhile, the thickness of the dielectric plate can be adjusted to form a second filter passband.
The content of the utility model, through the literature search, does not see the same public report with the utility model.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough, design a novel integrated dual band filter in plane.
The utility model relates to a novel integrated dual band filter in plane includes: top dielectric slab (1), intermediate level dielectric slab (2), bottom dielectric slab (3), wherein:
a. a metal layer (19) is printed on the upper surface of the top dielectric slab (1), and two rows of periodic metal patches (5) are printed on the lower surface of the top dielectric slab; a first periodic metal through hole (4) is formed in the top dielectric plate (1) in the direction parallel to the Y axis; the first periodic metal via (4) has three columns: two rows of periodic metal through holes at two sides are positioned right above the periodic metal patch (5), and one row of periodic metal through holes in the middle is positioned right in the middle of the top dielectric slab;
b. the middle dielectric plate (2) is positioned between the top dielectric plate (1) and the bottom dielectric plate (3);
c. the upper surface of the bottom dielectric slab (3) is positioned on an XOY plane, and the central position of the bottom dielectric slab is a coordinate origin; the bottom layer medium plate (3) is printed with an upper surface metal layer (17) and a lower surface metal layer (18); two ends of the upper surface metal layer (17) are respectively connected with the printed transition gradual change metal layers (13, 15) and the feed microstrip line metal layers (14, 16); second periodic metal through holes (6) are drilled on two sides of the bottom dielectric plate (3), third periodic metal through holes (7) are drilled in the middle of the bottom dielectric plate, and the central axis of each third periodic metal through hole (7) is overlapped with the Y axis; three groups of rectangular gaps are formed on the metal layer on the upper surface of the bottom dielectric plate (3): a first group of rectangular slits (8), a second group of rectangular slits (9) and a third group of rectangular slits (10); each group of rectangular slits (8,9,10) is two rectangular slits which are symmetrical about the y axis and are parallel to the X axis; the first set of rectangular slits (8) is a continuous slit, but each slit of the second and third sets of rectangular slits (9, 10) is not a continuous slit, but two small slits of the same size separated by a printed metal layer gap (11, 12);
d. the dielectric constant of a top dielectric plate (1) of the novel planar integrated dual-band filter is higher than that of a middle dielectric plate (2) and a bottom dielectric plate (3); the dielectric constants of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are the same, and the three layers of dielectric plates can be fixed together through bonding or screws; the top dielectric plate (1) and the middle dielectric plate (2) have the same length and width;
e. the width of a bottom dielectric slab (3) of the novel planar integrated dual-band filter is the same as that of an upper two dielectric slabs, but the length is slightly longer, so that transition gradually-changing line metal layers (13 and 15) and feed microstrip line metal layers (14 and 16) are in an exposed state, and testing is facilitated;
according to the novel planar integrated dual-band filter, the bottom dielectric plate (3) and the metal layer printed on the bottom dielectric plate, the gaps (8,9 and 10) on the metal layer, the metal through holes (6 and 7), the transition gradually line metal layers (13 and 15) and the feed microstrip line metal layers (14 and 16) form the dual-band filter; the top dielectric plate (1) and the first periodic metal through holes (4) and the periodic metal patches (5) on the top dielectric plate form an artificial magnetic conductor to form the package of the filter; the space radiation loss is effectively reduced, the plane wave is restrained, and the problem of space resonance is solved;
according to the novel planar integrated dual-band filter, the thickness of the top dielectric plate (1) is thicker than that of the middle dielectric plate (2), so that an electromagnetic band gap can cover the first pass band of the dual-band filter, and the out-of-band attenuation steepness of the filter is improved;
according to the novel planar integrated dual-band filter, the working bandwidth of the first pass band of the dual-band filter can be changed by changing the thickness of the top dielectric plate (1); the thickness of the top dielectric plate (1) is increased, so that the working bandwidth of the first passband can be reduced, the thickness of the top dielectric plate (1) is reduced, and the working bandwidth of the first passband can be increased;
according to the novel planar integrated dual-band filter, the second pass band of the dual-band filter is formed by increasing the thickness of the top dielectric plate (1);
according to the novel planar integrated dual-band filter, the middle-layer dielectric plate (2) ensures that a stable gap height exists between the upper and lower dielectric plates (1 and 3);
according to the novel planar integrated dual-band filter, two rows of periodic metal patches (5) are printed on two sides of the lower surface of the top dielectric plate (1), and the periodic metal circular patches are not printed in the middle position, so that the problem of resonance of an out-of-band stop band of a first pass band of the dual-band filter is solved;
according to the novel planar integrated dual-band filter, the third periodic metal through hole (7) in the middle of the bottom dielectric plate (3) enables all levels of grounding inductors in the dual-band filter circuit to be consistent; the diameter of the third periodic metal via hole (7) is changed to change the grounding inductance of each stage, so that the center frequency of the dual-band filter can be adjusted, and the bandwidth is unchanged;
according to the novel planar integrated dual-band filter, the working bandwidth of a first pass band of the dual-band filter and the transmission zero position on the right side of the first pass band can be adjusted by changing the length of a first group of rectangular slots (8) in a bottom dielectric plate (3); the length of the first group of rectangular slots (8) is increased, so that the working bandwidth of the first passband of the dual-band filter can be reduced, and the position of the transmission zero on the right side of the first passband of the dual-band filter is shifted to the left;
according to the novel planar integrated dual-band filter, the resonance of the out-of-band stop band of the first pass band of the dual-band filter is eliminated by adjusting the metal layer gaps (11 and 12) in the bottom dielectric plate (3);
according to the novel planar integrated dual-band filter, the requirements on the loss tangent of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are high, the dielectric plate with the small loss tangent needs to be selected as much as possible, but the requirements on the loss tangent of the top-layer dielectric plate (1) are not high, and the cheap dielectric plate with the large loss can be selected to reduce the cost.
Compared with the prior art, the utility model, have following advantage:
1. the problems of radiation loss and plane waves in the traditional slot substrate integrated waveguide filter are solved;
2. the device has small size, low profile, easy integration and easy processing;
3. the structure is stable, and the transmission performance is good;
4. the way of adjusting the operating frequency of the filter is simple.
Drawings
Fig. 1 is the overall structure diagram of the novel planar integrated dual-band filter of the present invention.
Fig. 2 is the utility model discloses a novel integrated dual band filter's in plane top layer dielectric plate's upper surface map.
Fig. 3 is a lower surface view of the top dielectric plate of the novel planar integrated dual band filter of the present invention.
Fig. 4 is a top surface view of the bottom dielectric plate of the novel planar integrated dual band filter of the present invention.
Fig. 5 is a lower surface view of the bottom dielectric plate of the novel planar integrated dual-band filter of the present invention.
Fig. 6 is a simulation and test chart of the novel planar integrated dual-band filter at S11 and S21 of 8-27GHz according to the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1-6, the utility model relates to a novel planar integrated dual-band filter, include: top dielectric slab (1), intermediate level dielectric slab (2), bottom dielectric slab (3), wherein:
a. a metal layer (19) is printed on the upper surface of the top dielectric slab (1), and two rows of periodic metal patches (5) are printed on the lower surface of the top dielectric slab; a first periodic metal through hole (4) is formed in the top dielectric plate (1) in the direction parallel to the Y axis; the first periodic metal via (4) has three columns: two rows of periodic metal through holes at two sides are positioned right above the periodic metal patch (5), and one row of periodic metal through holes in the middle is positioned right in the middle of the top dielectric slab;
b. the middle dielectric plate (2) is positioned between the top dielectric plate (1) and the bottom dielectric plate (3);
c. the upper surface of the bottom dielectric slab (3) is positioned on an XOY plane, and the central position of the bottom dielectric slab is a coordinate origin; the bottom layer medium plate (3) is printed with an upper surface metal layer (17) and a lower surface metal layer (18); two ends of the upper surface metal layer (17) are respectively connected with the printed transition gradual change metal layers (13, 15) and the feed microstrip line metal layers (14, 16); second periodic metal through holes (6) are drilled on two sides of the bottom dielectric plate (3), third periodic metal through holes (7) are drilled in the middle of the bottom dielectric plate, and the central axis of each third periodic metal through hole (7) is overlapped with the Y axis; three groups of rectangular gaps are formed on the metal layer on the upper surface of the bottom dielectric plate (3): a first group of rectangular slits (8), a second group of rectangular slits (9) and a third group of rectangular slits (10); each group of rectangular slits (8,9,10) is two rectangular slits which are symmetrical about the y axis and are parallel to the X axis; the first set of rectangular slits (8) is a continuous slit, but each slit of the second and third sets of rectangular slits (9, 10) is not a continuous slit, but two small slits of the same size separated by a printed metal layer gap (11, 12);
d. the dielectric constant of a top dielectric plate (1) of the novel planar integrated dual-band filter is higher than that of a middle dielectric plate (2) and a bottom dielectric plate (3); the dielectric constants of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are the same, and the three layers of dielectric plates can be fixed together through bonding or screws; the top dielectric plate (1) and the middle dielectric plate (2) have the same length and width;
e. the width of a bottom dielectric slab (3) of the novel planar integrated dual-band filter is the same as that of an upper two dielectric slabs, but the length is slightly longer, so that transition gradually-changing line metal layers (13 and 15) and feed microstrip line metal layers (14 and 16) are in an exposed state, and testing is facilitated;
according to the novel planar integrated dual-band filter, the bottom dielectric plate (3) and the metal layer printed on the bottom dielectric plate, the gaps (8,9 and 10) on the metal layer, the metal through holes (6 and 7), the transition gradually line metal layers (13 and 15) and the feed microstrip line metal layers (14 and 16) form the dual-band filter; the top dielectric plate (1) and the first periodic metal through holes (4) and the periodic metal patches (5) on the top dielectric plate form an artificial magnetic conductor to form the package of the filter; the space radiation loss is effectively reduced, the plane wave is restrained, and the problem of space resonance is solved;
according to the novel planar integrated dual-band filter, the thickness of the top dielectric plate (1) is thicker than that of the middle dielectric plate (2), so that an electromagnetic band gap can cover the first pass band of the dual-band filter, and the out-of-band attenuation steepness of the filter is improved;
according to the novel planar integrated dual-band filter, the working bandwidth of the first pass band of the dual-band filter can be changed by changing the thickness of the top dielectric plate (1); the thickness of the top dielectric plate (1) is increased, so that the working bandwidth of the first passband can be reduced, the thickness of the top dielectric plate (1) is reduced, and the working bandwidth of the first passband can be increased;
according to the novel planar integrated dual-band filter, the second pass band of the dual-band filter is formed by increasing the thickness of the top dielectric plate (1);
according to the novel planar integrated dual-band filter, the middle-layer dielectric plate (2) ensures that a stable gap height exists between the upper and lower dielectric plates (1 and 3);
according to the novel planar integrated dual-band filter, two rows of periodic metal patches (5) are printed on two sides of the lower surface of the top dielectric plate (1), and the periodic metal circular patches are not printed in the middle position, so that the problem of resonance of an out-of-band stop band of a first pass band of the dual-band filter is solved;
according to the novel planar integrated dual-band filter, the third periodic metal through hole (7) in the middle of the bottom dielectric plate (3) enables all levels of grounding inductors in the dual-band filter circuit to be consistent; the diameter of the third periodic metal via hole (7) is changed to change the grounding inductance of each stage, so that the center frequency of the dual-band filter can be adjusted, and the bandwidth is unchanged;
according to the novel planar integrated dual-band filter, the working bandwidth of a first pass band of the dual-band filter and the transmission zero position on the right side of the first pass band can be adjusted by changing the length of a first group of rectangular slots (8) in a bottom dielectric plate (3); the length of the first group of rectangular slots (8) is increased, so that the working bandwidth of the first passband of the dual-band filter can be reduced, and the position of the transmission zero on the right side of the first passband of the dual-band filter is shifted to the left;
according to the novel planar integrated dual-band filter, the resonance of the out-of-band stop band of the first pass band of the dual-band filter is eliminated by adjusting the metal layer gaps (11 and 12) in the bottom dielectric plate (3);
according to the novel planar integrated dual-band filter, the requirements on the loss tangent of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are high, the dielectric plate with the small loss tangent needs to be selected as much as possible, but the requirements on the loss tangent of the top-layer dielectric plate (1) are not high, and the cheap dielectric plate with the large loss can be selected to reduce the cost.
In actual manufacturing, the top dielectric plate (1) is made of a conventional cheap FR4_ epoxy dielectric material with a large dielectric constant, and the middle dielectric plate and the bottom dielectric plate are made of dielectric plates with small dielectric constants and losses; the double-frequency filter with the appearance size of 12.6mm 37.6mm 2.107mm actually manufactured by the method of the utility model has the center frequency of 15.5GHz and the working bandwidth of 1.9GHz, and the center frequency of the second passband of 24.88GHz and the working bandwidth of 0.5 GHz; the utility model discloses a novel plane integrated dual-band filter 'S first passband test' S S11 is less than-10 dB, and the majority is less than-15 dB 'S impedance characteristic, and S21 is less than-3.6 dB' S transmission characteristic; the S11 of the second passband test is less than-10 dB, most of the impedance characteristics are less than-15 dB, and the S21 transmission characteristics are less than-6 dB, so that the planar integrated dual-band filter is a novel planar integrated dual-band filter with small size, simple structure and good transmission performance.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.
Claims (10)
1. A novel planar integrated dual-band filter, comprising: top dielectric slab (1), intermediate level dielectric slab (2), bottom dielectric slab (3), wherein:
a. a metal layer (19) is printed on the upper surface of the top dielectric slab (1), and two rows of periodic metal patches (5) are printed on the lower surface of the top dielectric slab; a first periodic metal through hole (4) is formed in the top dielectric plate (1) in the direction parallel to the Y axis; the first periodic metal via (4) has three columns: two rows of periodic metal through holes at two sides are positioned right above the periodic metal patch (5), and one row of periodic metal through holes in the middle is positioned right in the middle of the top dielectric slab;
b. the middle dielectric plate (2) is positioned between the top dielectric plate (1) and the bottom dielectric plate (3);
c. the upper surface of the bottom dielectric slab (3) is positioned on an XOY plane, and the central position of the bottom dielectric slab is a coordinate origin; the bottom layer medium plate (3) is printed with an upper surface metal layer (17) and a lower surface metal layer (18); two ends of the upper surface metal layer (17) are respectively connected with the printed transition gradual change metal layers (13, 15) and the feed microstrip line metal layers (14, 16); second periodic metal through holes (6) are drilled on two sides of the bottom dielectric plate (3), third periodic metal through holes (7) are drilled in the middle of the bottom dielectric plate, and the central axis of each third periodic metal through hole (7) is overlapped with the Y axis; three groups of rectangular gaps are formed on the metal layer on the upper surface of the bottom dielectric plate (3): a first group of rectangular slits (8), a second group of rectangular slits (9) and a third group of rectangular slits (10);
each group of rectangular slits (8,9,10) is two rectangular slits which are symmetrical about the y axis and are parallel to the X axis; the first set of rectangular slits (8) is a continuous slit, but each slit of the second and third sets of rectangular slits (9, 10) is not a continuous slit, but two small slits of the same size separated by a printed metal layer gap (11, 12);
d. the dielectric constant of a top dielectric plate (1) of the novel planar integrated dual-band filter is higher than that of a middle dielectric plate (2) and a bottom dielectric plate (3); the dielectric constants of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are the same, and the three layers of dielectric plates can be fixed together through bonding or screws; the top dielectric plate (1) and the middle dielectric plate (2) have the same length and width;
e. the width of a bottom dielectric slab (3) of the novel planar integrated dual-band filter is the same as that of an upper two dielectric slabs, but the length is slightly longer, so that transition gradually-changing line metal layers (13 and 15) and feed microstrip line metal layers (14 and 16) are in an exposed state, and testing is facilitated;
f. according to the novel planar integrated dual-band filter, the bottom dielectric plate (3) and the metal layer printed on the bottom dielectric plate, the gaps (8,9 and 10) on the metal layer, the metal through holes (6 and 7), the transition gradually line metal layers (13 and 15) and the feed microstrip line metal layers (14 and 16) form the dual-band filter; the top dielectric plate (1) and the first periodic metal through holes (4) and the periodic metal patches (5) on the top dielectric plate form an artificial magnetic conductor to form the package of the filter; the middle dielectric plate is used for separating the top dielectric plate from the bottom dielectric plate.
2. The novel planar integrated dual band filter according to claim 1, wherein: the thickness of the top dielectric plate (1) is thicker than that of the middle dielectric plate (2), so that the electromagnetic band gap can cover the first passband of the dual-band filter, and the out-of-band attenuation steepness of the filter is improved.
3. The novel planar integrated dual band filter according to claim 1, wherein: the working bandwidth of the first pass band of the dual-band filter can be changed by changing the thickness of the top dielectric plate (1); the thickness of the top dielectric plate (1) is increased, the working bandwidth of the first passband can be reduced, the thickness of the top dielectric plate (1) is reduced, and the working bandwidth of the first passband can be increased.
4. The novel planar integrated dual band filter according to claim 1, wherein: the second pass band of the dual band filter is formed by increasing the thickness of the top dielectric plate (1).
5. The novel planar integrated dual band filter according to claim 1, wherein: the middle layer dielectric plate (2) ensures that a stable gap height exists between the upper and lower dielectric plates (1, 3).
6. The novel planar integrated dual band filter according to claim 1, wherein: two rows of periodic metal patches (5) are printed on two sides of the lower surface of the top dielectric plate (1), and no periodic metal circular patch is printed in the middle position, so that the problem of resonance of an out-of-band stop band of a first pass band of the dual-band filter is solved.
7. The novel planar integrated dual band filter according to claim 1, wherein: the third periodic metal through hole (7) in the middle of the bottom dielectric plate (3) enables all levels of grounding inductors in the dual-band filter circuit to be consistent; the diameter of the third periodic metal via hole (7) is changed to change grounding inductances of all levels, so that the center frequency of the dual-band filter can be adjusted, and the bandwidth is unchanged.
8. The novel planar integrated dual band filter according to claim 1, wherein: the working bandwidth of a first pass band of the dual-band filter and the position of a transmission zero point on the right side of the first pass band can be adjusted by changing the length of a first group of rectangular slots (8) in the bottom layer dielectric plate (3); the length of the first group of rectangular slots (8) is increased, so that the working bandwidth of the first passband of the dual-band filter can be reduced, and the position of the transmission zero on the right side of the first passband of the dual-band filter is shifted to the left.
9. The novel planar integrated dual band filter according to claim 1, wherein: the resonance of the out-of-band stop band of the first pass band of the dual-band filter is eliminated by adjusting the metal layer gaps (11, 12) in the bottom dielectric plate (3).
10. The novel planar integrated dual band filter according to claim 1, wherein: the requirements of the loss tangent of the middle-layer dielectric plate (2) and the bottom-layer dielectric plate (3) are high, the dielectric plate with the small loss tangent needs to be selected as much as possible, but the requirements of the loss tangent of the top-layer dielectric plate (1) is not high, and the cheap dielectric plate with the large loss can be selected to reduce the cost.
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| CN201810633755.3A CN108879037A (en) | 2018-06-20 | 2018-06-20 | The Planar integration dual frequency filter of encapsulation |
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| CN201920112164.1U Active CN209929453U (en) | 2018-06-20 | 2019-01-23 | Novel planar integrated dual-band filter |
| CN201910062618.3A Active CN109599646B (en) | 2018-06-20 | 2019-01-23 | Packaged planar integrated dual band filter |
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| CN109950688B (en) * | 2019-04-12 | 2023-10-27 | 云南大学 | Microstrip ISGW circular polarization gap traveling wave antenna |
| CN109994806B (en) * | 2019-04-22 | 2023-12-15 | 云南大学 | ISGW broadband band-pass filter with double transmission zero points and wide stop band |
| CN114914652B (en) * | 2022-05-30 | 2024-03-29 | 西安工业大学 | Center metal strip sputtered ITO film equalization filter SSPPs transmission line and filter |
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| CN114725642A (en) * | 2022-03-16 | 2022-07-08 | 天津大学 | Package Structures for Dielectric Integrated Suspended Line and Metal-Dielectric Integrated Suspended Line Active Devices |
| CN114725642B (en) * | 2022-03-16 | 2023-09-19 | 天津大学 | Packaging structure for dielectric integrated suspension wire and metal-dielectric integrated suspension wire active device |
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| CN108879037A (en) | 2018-11-23 |
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