CN114171864A - Multilayer filter based on substrate integrated slow wave air waveguide - Google Patents
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Abstract
The invention discloses a multilayer filter based on a substrate integrated slow wave air waveguide, which is a five-layer structure filter consisting of two air cavities, two slow wave dielectric plates and a coupling window layer; the transition line from the microstrip to the partially filled waveguide to the completely empty waveguide realizes the conversion of the fundamental mode under different conditions with high quality; and metallized through holes are formed in the first dielectric plate and the fifth dielectric plate, and a slow wave effect is introduced, so that an electric field is concentrated in air cavities in the second dielectric plate and the fourth dielectric plate. The invention can smoothly combine the slow wave effect with the substrate integrated air waveguide, realizes coexistence of high Q value and miniaturization, is easy to process and compact in structure, and has wide application prospect in microwave circuits and complex systems with strict requirements in multiple aspects such as miniaturization, high Q value, low loss and the like.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a multilayer filter based on a substrate integrated slow wave air waveguide.
Background
Due to the characteristics of the substrate integrated hollow waveguide removing medium, the size of the substrate integrated hollow waveguide removing medium is relatively large. The profile of the substrate integrated folded air waveguide can be greatly increased, the Q value of the substrate integrated half-mode air waveguide can be greatly reduced, therefore, how to reduce the size of the microwave device on the basis of keeping the high Q value has the investigatability, and the authorization notice in the prior art is as follows: CN110718732B, entitled substrate integrated slow wave air waveguide for improving the performance of microwave passive devices, discloses a three-layer structure filter, which can reduce the loss, increase the Q value and achieve miniaturization to some extent, but its size is still relatively large.
Disclosure of Invention
The invention aims to solve the technical problem that the substrate integrated air waveguide is utilized, the advantages of the substrate integrated air waveguide are kept, meanwhile, the slow wave effect is combined, the problem that the high Q value and miniaturization are difficult to combine is solved, and the application of a multilayer filter in the substrate integrated slow wave air waveguide is realized. The invention provides a multilayer filter based on a substrate integrated slow wave air waveguide, which is characterized in that metal through holes are uniformly arranged in a medium plate adjacent to an air layer on the basis of the substrate integrated air waveguide, so that an electric field is concentrated in the air waveguide, a magnetic field is still distributed in the whole structure, and the longitudinal and transverse dimensions are reduced simultaneously.
In order to solve the above-mentioned purpose, the invention adopts the following technical scheme to realize:
the invention relates to a multilayer filter based on a substrate integrated slow wave air waveguide, which comprises five dielectric plates from top to bottom, wherein the sizes of the first, third and fifth dielectric plates are smaller than those of the second and fourth dielectric plates, the first and fifth dielectric plates are provided with two rows of outer metalized through holes with uniform intervals along the metal wall of the air waveguide of the second and fourth dielectric plates, a plurality of rows of inner metalized through holes which are uniformly distributed are arranged between the two rows of outer metalized through holes, the bottom layer of the first dielectric plate and the top layer of the fifth dielectric plate outside the outer metalized through holes are both covered with metal, and the top layer of the first dielectric plate and the bottom layer of the fifth dielectric plate are the ground;
the second layer of dielectric plate and the fourth layer of dielectric plate are integrally hollowed in the middle to form an air cavity, a feed port is formed by impedance matching of a tapered asymptote of transition from the dielectric plate to an air waveguide, the asymptotes of the side wall of the air waveguide except for feeding are all electric walls, a metal microstrip feeds a top metal layer of the second layer of dielectric plate from the left end, a metal microstrip feeds a bottom metal layer of the fourth layer of dielectric plate from the right end and is respectively connected with tapered asymptotes of a left tapered transition structure and a right tapered transition structure, and the hollowed parts of the bottom of the second layer of dielectric plate and the top of the fourth layer of dielectric plate are completely covered with the metal layers;
and a plurality of coupling holes, namely coupling windows, are formed in the third dielectric plate, the periphery of each coupling hole is subjected to metallization treatment, and the top layer and the bottom layer of the third dielectric plate are covered with metal.
The invention is further improved in that: the projection circle centers of the outer metallized through holes on the first layer dielectric plate and the fifth layer dielectric plate on the second layer dielectric plate and the fourth layer dielectric plate are overlapped with the outer walls of the air cavities of the second layer dielectric plate and the fourth layer dielectric plate.
The invention is further improved in that: the coupling holes are rectangular grooves formed in two sides of the third layer of dielectric slab, and projections of the rectangular grooves on the fourth layer of dielectric slab are located between the two rows of outer metallized through holes.
The invention is further improved in that: the coupling holes are three circular holes formed in the middle of the third-layer dielectric slab, the middle circular holes are located in the middle of the third-layer dielectric slab, the other two circular holes are formed in the left side and the right side of the third-layer dielectric slab, and the diameters of the other two circular holes are smaller than the diameter of the circular hole in the middle of the third-layer dielectric slab.
The invention is further improved in that: the conical transition structure is in exponential distribution gradual change, and the tail end is in a circular arc shape
The invention is further improved in that: small through holes which are uniformly distributed and used for jacking screws are arranged around each layer of dielectric plate.
The invention has the beneficial effects that: compared with the traditional substrate integrated waveguide multilayer filter, the filter realizes higher Q value and lower insertion loss; compared with the traditional substrate integrated hollow waveguide structure, the filter structure is more compact, and the size reduction of 35% is realized. On the basis of integrating the slow wave air waveguide on the substrate, the invention realizes a five-layer multilayer cavity vertical coupling structure, realizes the combination of high Q value and miniaturization, and is more suitable for being applied to microwave circuit systems with higher complexity and strict requirements in various aspects such as miniaturization, high Q value, low loss and the like. In addition, different coupling holes are formed in the third dielectric slab, so that electric coupling or magnetic coupling can be realized, and the application range is wider.
Drawings
FIG. 1 is a top view of a multilayer electrically coupled filter based on a substrate integrated slow wave air waveguide according to the present invention.
FIG. 2 is a top view of a multilayer magnetic coupled filter based on a substrate integrated slow wave air waveguide according to the present invention.
Fig. 3a is a schematic diagram of a first dielectric plate of a multilayer electric coupling filter based on a substrate integrated slow wave air waveguide.
Fig. 3b is a schematic diagram of a second dielectric plate of the multilayer electric coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 3c is a schematic diagram of a third dielectric plate of the multilayer electric coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 3d is a schematic diagram of a fourth dielectric plate of the multilayer electric coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 3e is a schematic diagram of a fifth dielectric plate of the multilayer electric coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 4a is a schematic diagram of a first dielectric plate of a multilayer magnetic coupling filter based on a substrate integrated slow wave air waveguide.
Fig. 4b is a schematic diagram of the second dielectric plate of the multilayer magnetic coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 4c is a schematic diagram of the third dielectric plate of the multilayer magnetic coupling filter based on the substrate integrated slow wave air waveguide.
FIG. 4d is a diagram of the fourth dielectric plate of the multilayer magnetic coupling filter based on the substrate integrated slow wave air waveguide.
Fig. 4e is a schematic diagram of the fifth dielectric plate of the multilayer magnetic coupling filter based on the substrate integrated slow wave air waveguide.
FIG. 5 is a cross-sectional view of the internal electric field of the multilayer magnetic coupling filter waveguide based on the substrate integrated slow wave air waveguide.
FIG. 6 is a cross-sectional view of the internal magnetic field of the multilayer magnetic coupling filter based on the substrate integrated slow wave air waveguide.
FIG. 7 is a simulation diagram of S parameter of a multilayer electric coupling filter based on a substrate integrated slow wave air waveguide.
FIG. 8 is a simulation diagram of S parameter of a multilayer magnetic coupling filter based on a substrate integrated slow wave air waveguide.
Wherein, 1-first layer dielectric plate, 2-second layer dielectric plate, 3-third layer dielectric plate, 4-fourth layer dielectric plate, 5-fifth layer dielectric plate, 6-internal metallized through hole, 7-metal micro-strip, 8-air cavity, 9-circular hole, 10-rectangular groove, 11-conical transition structure, 12-ground, 13-metal wall,
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and will thus define the scope of the invention more clearly and clearly. These examples are illustrative only and are not to be construed as limiting the invention since they are intended to be specifically described herein.
The invention relates to a substrate-integrated slow wave air waveguide-based multilayer filter, which is a five-layer structure filter consisting of two air cavities, two slow wave dielectric plates and a coupling window layer, namely, the filter comprises five dielectric plates from top to bottom, wherein the five dielectric substrates are all Rogers 4003C dielectric plates, the dielectric constant is 3.55, the loss angle is 0.027, and the thickness is 0.813 mm; the sizes of the first dielectric plate 1, the third dielectric plate 3 and the fifth dielectric plate are smaller than those of the second dielectric plate 2 and the fourth dielectric plate 4, the lower surface of each dielectric plate is covered with a bottom metal layer, and the upper surface of each dielectric plate is covered with a top metal layer;
the first layer medium plate 1 and the fifth layer medium plate are provided with two rows of outer metalized through holes with uniform intervals along the metal wall 13 of the air waveguide of the second layer medium plate 2 and the fourth layer medium plate 4, and inner metalized through holes 6 with smaller intervals and smaller radiuses are arranged in the middle of the first layer medium plate 1 and the fifth layer medium plate and are evenly distributed above and below the air cavity 8 of the second layer medium plate and the fourth layer medium plate. The bottom layer of the first layer of dielectric plate 1 is metal at the outer side of the outer metal through hole, namely the part corresponding to the outer side of the air cavity 8 of the second layer of dielectric plate 2; the top layer of the fifth dielectric plate is arranged outside the outer metal through hole, namely the part corresponding to the outer side of the air cavity 8 of the fourth dielectric plate 4 is metal; the top layer of the first dielectric plate 1 and the bottom layer of the fifth dielectric plate are ground 12, namely metal; the first and fifth dielectric plates concentrate the electric field to the second and fourth air layers by metallizing through holes without influencing the magnetic field distribution, thereby realizing the slow wave effect.
The second layer dielectric plate 2 and the four layers of dielectric plates are integrally hollowed in the middle to form an air cavity 8, and air filling is used for replacing medium filling, so that loss can be greatly reduced, and the Q value is improved. The bottom of the second dielectric plate 2 and the top of the fourth dielectric plate 4 except the hollow part are completely covered with the metal layer. The feed port is impedance matched with a tapered asymptote which is transited from the dielectric plate to the air waveguide, and the side wall of the air waveguide except the asymptote of the feed is an electric wall, namely all the side wall is metal and is called as a metal wall; the top metal layer of the second dielectric plate 2 is fed from the left end by a metal micro-strip 7, and the bottom metal layer of the fourth dielectric plate 4 is fed from the right end by a metal micro-strip 7 and is respectively connected with the left conical asymptote and the right conical asymptote; the metal microstrip 7, namely the microstrip line, is connected to the second layer dielectric plate 2 and the four layers dielectric plate of the substrate integrated slow wave air waveguide multilayer filter through the tapered transition structure 11, and is used as an input port of the waveguide, for better impedance matching, the tapered transition structure 11 is in exponential distribution gradual change, and the tail end is in a circular arc shape. The width of the metal micro-strip 7 is equal to the width of the substrate integrated slow wave air waveguide based impedance matching.
For the electric coupling filter, the coupling holes are circular holes 9 formed in the third dielectric slab 3, that is, one circular hole 9 formed in the middle of the third dielectric slab 3 and two circular holes 9 with slightly smaller sizes formed on the left and right sides of the circular hole 9, and the peripheries of the three circular holes 9 are metallized;
for the magnetic coupling filter, two rectangular grooves 10 are respectively formed in the third layer of dielectric plate 3 close to two sides of the edge, the projection of the rectangular groove 10 on the fourth layer of dielectric plate 4 is positioned between two rows of outer metallized through holes, and the periphery of the rectangular groove 10 is metallized; small through holes for jacking screws are uniformly distributed around each layer of the five-layer dielectric plate, so that subsequent measurement is facilitated. When the filter is a magnetic coupling filter, the bottom metal layer of the first dielectric plate, the second dielectric plate, and one end of the top metal layer and the bottom metal layer of the first dielectric plate, which are close to the conical transition structure on the second dielectric plate, are provided with a protruding structure towards the air cavity, and two protrusions of the protruding structure are distributed on two side surfaces of the air cavity. Bulges are arranged on the top metal layer of the fifth dielectric slab, the fourth dielectric slab and the two sides of the air cavity corresponding to the end parts of the conical transition structure on the top metal layer and the bottom metal layer of the fifth dielectric slab and the fourth dielectric slab.
The invention relates to a multilayer filter based on a substrate integrated slow wave air waveguide, which is an improved multilayer vertical coupling filter on the substrate integrated slow wave air waveguide. The first layer of dielectric plate 1 and the fifth layer of dielectric plate form a slow wave effect in the waveguide by opening uniform and dense metalized through holes, and an electric field is concentrated in the air cavity 8 of the second and fourth layers of dielectric plates under the condition of not changing the distribution of a magnetic field, so that the transverse and longitudinal sizes of the waveguide are reduced while the high Q value is kept, and finally the combination of the high Q value and miniaturization is realized.
The substrate integrated slow wave air waveguide multilayer filter has the width of 20mm, and the substrate integrated slow wave air waveguide multilayer filter under the same working frequency band has the width of 30.75mm, so that the size of the substrate integrated slow wave air waveguide multilayer filter is reduced by 35%. In addition, the insertion loss of the substrate integrated waveguide multilayer filter is 1.5dB, the insertion loss of the substrate integrated slow wave air waveguide multilayer filter is 0.76dB, and the insertion loss is reduced by 50%.
Fig. 7 is a simulation result of S-parameter of a multilayer filter based on a substrate-integrated slow wave air waveguide, in which the return loss of the waveguide is greater than 18dB (the higher the frequency, the more the input port is mismatched gradually, the return loss is decreased gradually) in the case where the thicknesses of the middle dielectric plate and the lower dielectric plate are the same.
As shown in FIG. 3 and FIG. 7, the center frequency of the multilayer electric coupling filter based on the substrate integrated slow wave cavity waveguide is 7.3GHz, the relative bandwidth is 14.6%, the return loss is greater than 20dB, and the insertion loss reaches 0.7 dB. As shown in FIG. 4 and FIG. 8, the multilayer magnetic coupling filter based on the substrate integrated slow wave cavity waveguide has the center frequency of 7.9GHz, the relative bandwidth of 14.1%, the return loss of more than 20dB and the insertion loss of 0.65 dB. The multilayer electric coupling filter and the magnetic coupling filter greatly reduce the loss, improve the transmission performance, reduce the size by 35 percent compared with the substrate integrated air waveguide multilayer filter with the same performance, and realize the combination of compact structure, low loss and high Q value.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. Multilayer filter based on integrated slow wave air waveguide of substrate, including from top to bottom five layers of dielectric slabs, first, three, five layers of dielectric slab sizes are less than second, four layers of dielectric slabs, its characterized in that: the first and fifth dielectric slabs are provided with two rows of outer metalized through holes with uniform intervals along the metal wall of the air waveguide of the second and fourth dielectric slabs, a plurality of rows of inner metalized through holes which are uniformly distributed are arranged between the two rows of outer metalized through holes, slow wave effect is introduced through the outer metalized through holes and the inner metalized through holes, the bottom layer of the first dielectric slab and the top layer of the fifth dielectric slab outside the outer metalized through holes are both covered with metal, and the top layer of the first dielectric slab and the bottom layer of the fifth dielectric slab are grounded;
the second layer of dielectric plate and the fourth layer of dielectric plate are integrally hollowed in the middle to form an air cavity, a feed port is formed by impedance matching of a tapered asymptote of transition from the dielectric plate to an air waveguide, the asymptotes of the side wall of the air waveguide except for feeding are all electric walls, a metal microstrip feeds a top metal layer of the second layer of dielectric plate from the left end, a metal microstrip feeds a bottom metal layer of the fourth layer of dielectric plate from the right end and is respectively connected with tapered asymptotes of a left tapered transition structure and a right tapered transition structure, and the hollowed parts of the bottom of the second layer of dielectric plate and the top of the fourth layer of dielectric plate completely cover the metal layers;
and a plurality of coupling holes are formed in the third dielectric plate, the periphery of each coupling hole is metallized, and the top layer and the bottom layer of the third layer plate are covered with metal.
2. The substrate integrated slow wave air waveguide based multilayer filter of claim 1, wherein: the coupling holes are three circular holes formed in the middle of the third-layer dielectric slab, the middle circular holes are located in the middle of the third-layer dielectric slab, the other two circular holes are formed in the left side and the right side of the third-layer dielectric slab, and the diameters of the other two circular holes are smaller than the diameter of the circular hole in the middle of the third-layer dielectric slab.
3. The substrate integrated slow wave air waveguide based multilayer filter of claim 1, wherein: the coupling holes are rectangular grooves formed in two sides of the third layer of dielectric slab, and projections of the rectangular grooves on the fourth layer of dielectric slab are located between the two rows of outer metallized through holes.
4. The substrate integrated slow wave air waveguide based multilayer filter of claim 1, wherein: the projection circle centers of the outer metallized through holes on the first layer dielectric plate and the fifth layer dielectric plate on the second layer dielectric plate and the fourth layer dielectric plate are overlapped with the outer walls of the air cavities of the second layer dielectric plate and the fourth layer dielectric plate.
5. The substrate integrated slow wave air waveguide based multilayer filter of claim 1, wherein: the conical transition structure is in exponential distribution and gradual change, and the tail end is in a circular arc shape.
6. The substrate integrated slow wave air waveguide based multilayer filter of claim 1, wherein: small through holes which are uniformly distributed and used for jacking screws are arranged around each layer of dielectric plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115513622A (en) * | 2022-11-03 | 2022-12-23 | 西华大学 | Quarter-mode slow-wave substrate integrated waveguide filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904571A (en) * | 2019-02-25 | 2019-06-18 | 江南大学 | Substrate integral wave guide filter based on electromagnetism hybrid coupled |
| CN110718732A (en) * | 2019-10-28 | 2020-01-21 | 南京邮电大学 | Substrate integrated slow wave air waveguide for improving performance of microwave passive device |
| CN111029696A (en) * | 2019-11-20 | 2020-04-17 | 西安电子科技大学 | Second-order filter based on miniaturized stacking of slow-wave substrate integrated groove gap waveguide |
-
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- 2021-12-14 CN CN202111529834.8A patent/CN114171864A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904571A (en) * | 2019-02-25 | 2019-06-18 | 江南大学 | Substrate integral wave guide filter based on electromagnetism hybrid coupled |
| CN111293388A (en) * | 2019-02-25 | 2020-06-16 | 江南大学 | Substrate integrated waveguide filter based on electromagnetic hybrid coupling |
| CN110718732A (en) * | 2019-10-28 | 2020-01-21 | 南京邮电大学 | Substrate integrated slow wave air waveguide for improving performance of microwave passive device |
| CN111029696A (en) * | 2019-11-20 | 2020-04-17 | 西安电子科技大学 | Second-order filter based on miniaturized stacking of slow-wave substrate integrated groove gap waveguide |
Non-Patent Citations (2)
| Title |
|---|
| DINGHONG JIA等: "Multilayer Substrate Integrated Waveguide (SIW) Filters With Higher-Order Mode Suppression", 《 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| JINGXIA QIANG等: "Enhanced Performance of Multilayer Bandpass Filter Using Slow-Wave Empty Substrate- Integrated Waveguide (SW-ESIW)", 《IEEE》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115513622A (en) * | 2022-11-03 | 2022-12-23 | 西华大学 | Quarter-mode slow-wave substrate integrated waveguide filter |
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