CN115764211A - Microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and method - Google Patents
Microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and method Download PDFInfo
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- CN115764211A CN115764211A CN202211580866.5A CN202211580866A CN115764211A CN 115764211 A CN115764211 A CN 115764211A CN 202211580866 A CN202211580866 A CN 202211580866A CN 115764211 A CN115764211 A CN 115764211A
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Abstract
The invention relates to the technical field of waveguide technology and band-pass filter of millimeter wave communication system, in particular to a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and a method; the dielectric resonator comprises an upper dielectric plate and a lower dielectric plate, wherein an upper conductor surface of the upper dielectric plate and a lower conductor surface of the lower dielectric plate are conductor surfaces, the lower dielectric plate is provided with an EBG structure, and the upper dielectric plate and the lower dielectric plate form a closed resonant cavity; a feed microstrip ridge and an output microstrip ridge are embedded in the resonant cavity, wherein a feed connection point is arranged at the strongest position of the common electric field of the feed microstrip ridge, the feed microstrip ridge is connected with the lower conductor surface of the lower dielectric plate, an output connection point is arranged at the strongest position of the common electric field of the output microstrip ridge, and the output microstrip ridge is connected with the lower conductor surface of the lower dielectric plate; the rear ends of the feed microstrip ridge and the output microstrip ridge are both connected with the microstrip line. The object of the invention is to realize a dual-mode filter and to realize one transmission zero for each of the high and low frequencies of the passband.
Description
Technical Field
The invention relates to the technical field of waveguide technology and band-pass filters of millimeter wave communication systems, in particular to a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and a method.
Background
The microstrip filter is a common circuit of a microwave low-frequency band, and the performance of the microstrip filter is greatly improved by designing different resonators and increasing coupling paths of the resonators. The traditional interweaving type microstrip filter is developed into an E-type resonator, so that energy is enabled to follow two paths between feed and output, a generalized Chebyshev type band-pass filter is realized, the size of the resonator is reduced, and the out-of-band rejection characteristic of the filter is improved; the open resonant loop filter adopts a zero-pole optimization algorithm to realize multi-order filtering, and more transmission zero-poles are obtained; the microstrip line filter can also improve the coupling path of the resonator, improve the filtering performance and reduce the plane size of the circuit by a vertical coupling method of a multilayer dielectric plate, and adopts a multilayer dielectric plate structure by adopting a slot vertical coupling mode. The microstrip filter has a problem of large transmission loss due to radiation loss caused by the contact of the resonator with air, and increases as the operating frequency increases.
In the microwave and millimeter wave frequency band, due to the advantages of small size, steep out-of-band rejection and the like, the dual-mode band-pass filter is widely concerned. The substrate integrated waveguide filter is a common filter of a millimeter wave communication system, the structure of a single-layer dielectric plate of the substrate integrated waveguide filter enables the filter design to easily realize the cascade connection and the coupling of a multi-level resonant cavity, and the coupling mode is window electric coupling and metal column magnetic coupling. The substrate integrated waveguide dual-mode band-pass filter has a simple structure, but the out-of-band rejection characteristic is not easy to control. By designing the perturbation structure, the substrate integrated waveguide dual-mode band-pass filter can realize out-of-band transmission zero, but usually only one transmission zero of low frequency or high frequency can be realized, and the perturbation structure enables the energy of the substrate integrated waveguide to be leaked outwards, thereby influencing the in-band transmission performance of the filter.
Disclosure of Invention
Technical problem to be solved
The invention mainly aims at the problems and provides a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and a method, and aims to realize the dual-mode filter and realize one transmission zero point at high frequency and low frequency of a pass band.
(II) technical scheme
In order to achieve the purpose, the invention provides a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter which comprises an upper dielectric plate with an upper conductor surface and a lower dielectric plate with a lower conductor surface, wherein a plurality of EBG structures are uniformly distributed on the lower dielectric plate along the edge to form a closed resonant cavity together with the upper dielectric plate; a feed microstrip ridge and an output microstrip ridge are embedded in the resonant cavity, wherein a feed connection point is arranged at the position of the feed microstrip ridge where the common electric field is strongest, the feed microstrip ridge is connected with the lower conductor surface of the lower dielectric plate, an output connection point is arranged at the position of the output microstrip ridge where the common electric field is strongest, and the output microstrip ridge is connected with the lower conductor surface of the lower dielectric plate; the rear ends of the feed microstrip ridge and the output microstrip ridge are both connected with microstrip lines.
Further, when the feed microstrip ridge and the output microstrip ridge are disposed in the resonant cavity, the resonant mode dominated by the feed microstrip ridge and the output microstrip ridge is a degenerate mode with two orthogonal electric fields, and the feed connection point and the output connection point are located at a strongest position of a common electric field of the degenerate modes with two orthogonal electric fields.
Further, the resonant cavity is a closed rectangular cavity.
Further, the model of the upper dielectric plate and the lower dielectric plate as the circuit board dielectric substrate is Rogers RO4003.
Furthermore, the upper conductor surface of the upper dielectric plate and the lower conductor surface of the lower dielectric plate are copper-clad metal conductor surfaces.
Further, the lower ends of the feed microstrip ridge and the output microstrip ridge are portions gradually changed from a rectangle to be reduced in width so as to be connected with the microstrip lines.
In order to achieve the above object, the present invention provides a filtering coupling topology method for a resonant cavity of a substrate integrated gap waveguide, the method comprising the steps of:
step S100, utilizing a lower conductor surface of an upper dielectric plate and an upper conductor surface of a lower dielectric plate as two conductor surfaces of a resonant cavity;
s200, uniformly distributing a plurality of EBG structures along the edge of a lower-layer dielectric slab to form a closed resonant cavity together with the upper-layer dielectric slab;
step S300, embedding a feed microstrip ridge and an output microstrip ridge in the resonant cavity, so that a resonant mode dominated by the feed microstrip ridge and the output microstrip ridge forms a degenerate mode with two orthogonal electric fields;
and S400, designing feeding and output feeding positions at the strongest common electric field position of the two electric field orthogonal degenerate modes, so that the two electric field orthogonal degenerate modes are coupled.
Further, the step S400 includes:
step S401, making two mutually perpendicular broken lines through the center of the resonant cavity, and dividing the resonant cavity into four areas;
and S402, the feeding and outputting positions of the resonant cavity are positioned in the centers of the two areas on the right side.
Further, an upper dielectric plate and a lower dielectric plate of a Rogers RO4003 model are used as the circuit board dielectric substrates.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the feed microstrip ridge and the output microstrip ridge are arranged at the strongest position of the common electric field of the resonant cavity, so that coupling occurs between two modes in the resonant cavity, between the two modes and between the feed microstrip ridge and the output microstrip ridge, and two resonant poles and two transmission zeros in the filter characteristic are generated. The filter and the coupling method can realize double-mode resonance, and realize transmission zero points around the pass band of the filter under the condition of not increasing a circuit structure.
Drawings
Fig. 1 is a schematic perspective view of an integrated substrate gap waveguide resonator according to the present disclosure.
Fig. 2 is a schematic top view of an integrated substrate gap waveguide resonator according to the present invention.
Fig. 3 is a top view of a microstrip ridge feeding type substrate integrated gap waveguide dual-mode band-pass filter structure disclosed in the present invention.
Fig. 4 is a perspective view of a microstrip ridge feeding type substrate integrated gap waveguide dual-mode bandpass filter structure disclosed in the present invention.
Fig. 5 is a simulation result diagram of a microstrip ridge feeding type substrate integrated gap waveguide dual-mode band-pass filter disclosed in the present invention.
Fig. 6 is a layout diagram of the feed position and the output position of a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter disclosed in the present invention.
Fig. 7 is an electric field diagram of a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter disclosed by the invention under different phases at two resonant frequencies of 25.5 GHz.
Fig. 8 is an electric field diagram of a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter disclosed by the invention under different phases at two resonant frequencies of 26.2 GHz.
In the figure: 1. an upper dielectric plate; 2. a lower dielectric slab; 3. an EBG structure; 4. a feed microstrip ridge; 5. outputting the microstrip ridge; 6 and 7, the strongest positions of the common electric field; 8. a microstrip line; 10. an upper conductor plane; 20. a lower conductor plane; 100. a resonant cavity is provided.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-8, a microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter includes an upper dielectric plate 1 having an upper conductor plane 10 and a lower dielectric plate 2 having a lower conductor plane 20, where a plurality of EBG structures 3 are uniformly distributed along the edge of the lower dielectric plate 2 to form a closed resonant cavity 100 with the upper dielectric plate 1; a feed microstrip ridge 4 and an output microstrip ridge 5 are embedded in the resonant cavity 100, wherein the feed microstrip ridge 4 is arranged at the strongest position 6 of the common electric field of the resonant cavity, the feed microstrip ridge 4 is connected with the lower conductor surface 20 of the lower dielectric plate 2, the output microstrip ridge 5 is arranged at the strongest position 7 of the other common electric field of the resonant cavity, and the output microstrip ridge 5 is connected with the lower conductor surface 20 of the lower dielectric plate 2; the rear ends of the feed microstrip ridge 4 and the output microstrip ridge 5 are both connected with a microstrip line 8.
In this embodiment, the resonant cavity 100 utilizes the feeding microstrip ridge 4 at the strongest position 6 of the common electric field and the output microstrip ridge 5 at the strongest position 7 of the public electric field to respectively excite the two TE mode electromagnetic wave resonances, respectively TE modes 102 And TE 201 . Feed excitation TE 102 Time, TE 201 Meanwhile, the coupling is carried out at the feed position and is transmitted out from the output position, thereby realizing a main coupling path of feed-output and realizing two resonance poles in the filter characteristic, namely a dual-mode filter.
In addition, both the feed and the output excite two modes, i.e. excitation of TE 102 Mode again excites TE 201 Mode, thereby realizing' feeding-TE 201 Output "and" output "TE 102 Two cross-coupling paths of the feed, thus creating two transmission zeros in the filter characteristic.
As shown in fig. 1, the upper conductor plane 10 of the upper dielectric plate 1 and the lower conductor plane 20 of the lower dielectric plate 2 of the resonant cavity 100 are both coated with copper to form two conductor planes of the resonant cavity 100, and the periphery of the lower dielectric plate 2 is provided with a plurality of rows of EBG structures 3, thereby forming a closed rectangular cavity 100.
In this embodiment, according to the EBG theory, the forbidden band is 21.6 to 35GHz, so that only the electric field mode within the resonant cavity 100 with the resonant frequency within the forbidden band can be transmitted through the microstrip ridge.
In the present embodiment, when the feeding microstrip ridge 4 and the output microstrip ridge 5 are disposed in the resonant cavity 100, the resonant modes dominated by the feeding microstrip ridge 4 and the output microstrip ridge 5 are degenerate modes with two orthogonal electric fields, and the feeding connection point 6 and the output connection point 7 are located at the strongest positions of the common electric field of the degenerate modes with two orthogonal electric fields.
The structure and topology of the microstrip ridge-fed integrated substrate gap waveguide dual-mode band-pass filter will be described below.
As shown in FIGS. 1 and 2, rogers RO4003 was used as the upper dielectric sheet 1 and the lower dielectric sheet 2, and the dielectric constant ε was obtained r1 ＝ε r2 =3.48, resonator 100 size L c ＝5.7mm、W c ＝5.7mm、h 1 ＝0.508mm、h 2 =0.813. The EBG structure 3 around the resonant cavity 100 has the dimensions p =1.8mm, d respectively v =0.6 and d p ＝1.5mm。
The resonator 100 has multiple resonant modes, wherein TE 102 And TE 201 Is a degenerate mode with two orthogonal electric fields and a resonant frequency f 102 And f 201 . The length and width of the resonant cavity being L c And W c Determines the resonant frequency of the filter if the length L of the cavity 100 c And width W c Are equal, then f 102 And f 201 Same, otherwise not equal.
As shown in fig. 3 and 4, the width of the feed microstrip ridge 4 and the output microstrip ridge 5 is W 2 The width of the feed microstrip ridge 4 and the output microstrip ridge 5 embedded in the resonant cavity 100 is W 3 And as the feed and output of the resonant cavity 100, the rear ends of the feed microstrip ridge 4 and the output microstrip ridge 5 are connected by a gradient line and have a width W 1 A feed microstrip ridge 4 and an output microstrip 8Metal through holes are arranged below the ridges 5 and are connected with the lower conductor surface 20 of the lower dielectric plate 2, and 3 rows of EBG structures 3 are arranged around the metal through holes; microstrip line 8 width W 1 And the width W of the feed microstrip ridge 4 and the output microstrip ridge 5 2 The transmission characteristics of the integrated substrate gap waveguide are affected. The parameter values are respectively L c ＝5.7mm、W c ＝6.1mm、W 1 ＝0.5mm、W 2 ＝1.3mm、d 1 =3.55mm and d 2 ＝3.15mm。
Width of W 2 The feed microstrip ridge 4, the output microstrip ridge 5 and the width W 3 Has different characteristic impedance, and strengthens input and output of power feed and TE 102 And TE 201 The coupling of modes and improves the impedance matching problem.
The simulation result of the integrated substrate gap waveguide dual-mode band-pass filter with the microstrip ridge feed is shown in fig. 5, the performance is good, the average insertion loss is 1.2dB, and two transmission zeros are respectively located at 25.8GHz and 29.2GHz.
In the structure of the invention, the dual-mode band-pass filter is designed by adopting the integrated substrate gap waveguide technology, energy is restricted in the microstrip ridge, and the structure is similar to a microstrip line structure, so that the setting of a distributed parameter element and the impedance matching of a circuit are easy to carry out. And through the structure of the invention, a plurality of electromagnetic band gap structures (namely EBG structures 3) of the integrated substrate gap waveguide are removed to form the dual-mode resonant cavity, so that the dual-mode resonant cavity can not only feed electricity to the dual-mode resonator, but also realize normal mode disturbance, and has great freedom degree of circuit design. The structure of the invention realizes transmission zero points around the pass band of the filter without increasing the circuit structure, and has obvious advantages in the filter characteristic.
The embodiment of the application provides a filtering coupling topological method of a resonant cavity of a substrate integrated gap waveguide, which comprises the following steps:
s100, using a lower conductor surface of an upper-layer dielectric plate and an upper conductor surface of a lower-layer dielectric plate as two conductor surfaces of a resonant cavity;
s200, uniformly distributing a plurality of EBG structures along the edge of a lower-layer dielectric slab to form a closed resonant cavity together with the upper-layer dielectric slab;
step S300, embedding a feed microstrip ridge and an output microstrip ridge in the resonant cavity, so that two degenerate modes with orthogonal electric fields are formed by the feed microstrip ridge and the resonant mode dominated by the output microstrip ridge;
and S400, designing feeding and output feeding positions at the strongest common electric field position of the two electric field orthogonal degenerate modes, so that the two electric field orthogonal degenerate modes are coupled.
In this embodiment, fig. 6 shows the position design of the feeding and outputting of the substrate integrated gap waveguide dual-mode filter with dual transmission zeros, where a rectangle is a dual-mode resonator, the coordinates of the center of the cavity are (0, y, 0), two dotted lines passing through the center of the cavity divide the resonator 100 into four regions, and a circular black dot indicates the position of the feeding and outputting of the dual-mode resonator and is located at the center of the two regions on the right. TE is shown below FIG. 6 201 Mode and TE 102 Electric field distribution and feed/output position during mode operation, wherein two strongest positions of electric field in horizontal direction (x-axis direction) are TE 201 Mode, TE is the position where two strongest electric fields appear in the vertical direction (y-axis direction) 102 Mode, the designed feed/output position is located on the black solid circle; the black filled circles represent the locations of the feed and output of the dual-mode cavity.
The resonant cavity 100 adopts the feeding microstrip ridge 4 at the feeding position 6 and the output microstrip ridge 5 at the feeding position 7 to respectively excite two TE mode electromagnetic wave resonances, respectively TE 102 And TE 201 . Feed excitation TE 102 Time, TE 201 At the same time TE is coupled at the position of the feed 102 ，TE 201 Transmitted from the output position to realize' feeding-TE 102 ——TE 201 The main coupling path of the output "implements two resonance poles in the filter characteristic, i.e. a dual-mode filter.
In addition, both the feed and the output excite two modes, i.e. excitation of TE 102 Mode again excites TE 201 Mode, thereby realizing' feeding-TE 201 Output "and" output-TE 102 Two cross-coupling paths of the feed, thus creating a filter characteristicTwo transmission zeros.
In order to explain the generation principle of the dual-resonance pole and the dual-transmission zero of the dual-mode filter more clearly, fig. 7 and 8 show electric field diagrams of Integrated Substrate Gap Waveguide (ISGW) dual-mode filter with microstrip ridge feeding at different phases at two resonance frequencies of 25.5GHz and 26.2 GHz. The period of the electric field phase is 180 deg., so that the electric field pattern observation at 4 phases of 0 deg. -180 deg. is selected.
As can be seen from FIG. 7, the electric field pattern at 25.5GHz is changed from 0 TE 102 Converted into TE of 95 DEG 201 While the electric field patterns at 45 deg. and 140 deg. are TE-like 102 And similar TE 201 Mode, the electric field rotates by about 45 °. In FIG. 8, at a frequency of 26.2GHz, the electric field is TE at 0 ° 201 Mode, TE at 70 DEG 102 Mode, mode conversion also takes place, and the other two phases 45 ° and 110 ° are also TE 102 And TE 201 Similar pattern rotation results.
From the analysis of the electric field diagrams of fig. 7 and 8 it can be seen that: first, the simultaneous presence of TE at two resonant frequencies 102 And TE 201 Two modes, i.e., coupling between the modes occurs; second, the filters cross-couple, which appears as both the feed and output excitation of two modes, i.e., TE excitation 102 Mode again excites TE 201 Mode, two cross-couplings produce two transmission zeros in the filter characteristic.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be also considered as the protection scope of the present invention.
Claims (9)
1. A microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter is characterized by comprising an upper dielectric plate with an upper conductor surface and a lower dielectric plate with a lower conductor surface, wherein a plurality of EBG structures are uniformly distributed on the lower dielectric plate along the edge to form a closed resonant cavity together with the upper dielectric plate; a feed microstrip ridge and an output microstrip ridge are embedded in the resonant cavity, wherein a feed connection point is arranged at the position of the feed microstrip ridge where the common electric field is strongest, the feed microstrip ridge is connected with the lower conductor surface of the lower dielectric plate, an output connection point is arranged at the position of the output microstrip ridge where the common electric field is strongest, and the output microstrip ridge is connected with the lower conductor surface of the lower dielectric plate; the rear ends of the feed microstrip ridge and the output microstrip ridge are both connected with microstrip lines.
2. The microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein when the feed microstrip ridge and the output microstrip ridge are disposed in the resonant cavity, the resonant mode dominated by the feed microstrip ridge and the output microstrip ridge is a degenerate mode in which two electric fields are orthogonal, and the feed connection point and the output connection point are located at a position where a common electric field of the degenerate mode in which the two electric fields are orthogonal is strongest.
3. The microstrip ridge feed substrate integrated gap waveguide bimodal bandpass filter according to claim 1, wherein the resonant cavity is a closed rectangular cavity.
4. The microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein the model of the upper dielectric plate and the lower dielectric plate as a circuit board dielectric substrate is Rogers RO4003.
5. The microstrip ridge feed substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein the upper conductor plane of the upper dielectric slab and the lower conductor plane of the lower dielectric slab are copper-clad metal conductor planes.
6. The microstrip ridge feed substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein the lower ends of the feed microstrip ridge and the output microstrip ridge are portions gradually changed from a rectangle to be reduced in width so as to be connected with the microstrip line.
7. A topological method for filtering coupling of a resonant cavity of a substrate integrated gap waveguide is characterized by comprising the following steps of:
the lower conductor surface of the upper dielectric plate and the upper conductor surface of the lower dielectric plate are used as two conductor surfaces of the resonant cavity;
uniformly distributing a plurality of EBG structures along the edge of the lower dielectric plate and forming a closed resonant cavity with the upper dielectric plate;
embedding a feed microstrip ridge and an output microstrip ridge in the resonant cavity, so that a resonant mode dominated by the feed microstrip ridge and the output microstrip ridge forms two degenerate modes with orthogonal electric fields;
and designing the feeding position and the output feeding position at the strongest common electric field position of the two electric field orthogonal degenerate modes to couple the two electric field orthogonal degenerate modes.
8. The topological method for filter coupling of a resonator cavity of a substrate integrated gap waveguide of claim 7, wherein the step of designing the feeding and output feeding positions at the strongest common electric field position of the two degenerate modes with orthogonal electric fields to couple the two degenerate modes with orthogonal electric fields comprises:
making two mutually perpendicular dotted lines passing through the center of the resonant cavity to divide the resonant cavity into four regions;
the feeding and outputting positions of the resonant cavity are positioned in the centers of the two areas on the right side.
9. The method of claim 7, wherein upper and lower dielectric slabs of the Rogers RO4003 model are used as circuit board dielectric substrates.
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| CN202211580866.5A CN115764211A (en) | 2022-12-09 | 2022-12-09 | Microstrip ridge feed type substrate integrated gap waveguide dual-mode band-pass filter and method |
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