CN115764208A - Coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter and method - Google Patents

Coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter and method Download PDF

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CN115764208A
CN115764208A CN202211581943.9A CN202211581943A CN115764208A CN 115764208 A CN115764208 A CN 115764208A CN 202211581943 A CN202211581943 A CN 202211581943A CN 115764208 A CN115764208 A CN 115764208A
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dielectric plate
resonant cavity
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coaxial feed
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陈剑培
申东娅
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Yunnan Minzu University
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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 coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter and a method; the resonant cavity 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 first coaxial feed port penetrating through the lower dielectric plate is arranged at the position with the strongest common electric field in the resonant cavity, and a second coaxial output port penetrating through the upper dielectric plate is also arranged at the position with the strongest common electric field in the resonant cavity; the invention aims to realize a dual-mode filter and realize one transmission zero point of high frequency and low frequency of a pass band.

Description

Coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter and method
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 coaxial 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 multi-layer dielectric slab vertical coupling method, and adopts a multi-layer dielectric slab structure in a slot vertical coupling mode. The microstrip filter has a problem in that transmission loss is large 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 slab of the substrate integrated waveguide filter enables the filter design to easily realize cascade connection and coupling of multi-level resonant cavities, and the coupling mode is window electric coupling and metal column electric 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 coaxial 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 for high frequency and low frequency of a pass band.
(II) technical scheme
In order to achieve the purpose, the invention provides a coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter, which comprises an upper-layer dielectric plate with an upper conductor surface and a lower-layer dielectric plate with a lower conductor surface, wherein a plurality of EBG structures are uniformly distributed on the lower-layer dielectric plate along the edge to form a closed resonant cavity together with the upper-layer dielectric plate, a first coaxial feed port penetrating through the lower-layer dielectric plate is arranged at the strongest position of a public electric field in the resonant cavity, and a second coaxial output port penetrating through the upper-layer dielectric plate is also arranged at the strongest position of the public electric field in the resonant cavity; coaxial lines for feeding the resonant cavity are arranged at the first coaxial feed port and the second coaxial output port.
Furthermore, two mutually perpendicular dashed lines are made through the center point of the resonant cavity, and the resonant first coaxial feed port and the resonant second coaxial output port are symmetrically arranged along one of the dashed lines.
Further, the resonant cavity is a closed rectangular cavity.
Furthermore, 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 of the lower dielectric plate are metal conductor surfaces coated with copper.
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, comprising the following steps:
step S100, using the lower conductor surface of the upper dielectric plate and the upper conductor surface of the 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, exciting a degenerate mode with two orthogonal electric fields in the resonant cavity;
step S400, overlapping the two orthogonal degenerate modes of the electric field in a certain range to form an overlapping area with the strongest electric field;
step S500, arranging a first coaxial feed port penetrating through the lower dielectric plate and a second coaxial output port penetrating through the upper dielectric plate in an overlapping area of the strongest electric field;
step S600, connecting coaxial lines at the first coaxial feed port and the second coaxial output port to enable the two orthogonal degenerate modes of the electric fields to generate coupling.
Further, the step of providing a first coaxial feed port penetrating through the lower dielectric plate and a second coaxial output port penetrating through the upper dielectric plate in the overlap region of the strongest electric field 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 positions of the first coaxial feed port and the second coaxial output port of the resonant cavity are positioned in the centers of the left area and the right area.
Further, an upper dielectric plate and a lower dielectric plate of a Rogers RO4003 model are used as circuit board dielectric substrates.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the first coaxial feed port and the second coaxial output port are arranged at the position where the public electric field of the resonant cavity is strongest, so that coupling occurs between two modes in the resonant cavity and between the two modes and the first coaxial feed port and the second coaxial output port, and two resonant poles and two transmission zeros in the filter characteristic are generated. The double-mode 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 schematic perspective view of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter according to the present invention.
Fig. 4 is a top view of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter structure disclosed in the present invention.
Fig. 5 is a simulation result diagram of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter disclosed in the present invention.
Fig. 6 is an electric field diagram at two resonant frequencies of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter disclosed in the present invention.
Fig. 7 is a distribution diagram of the feed position and the output position of a coaxial feed substrate integrated gap waveguide dual-mode band-pass filter disclosed in the present invention.
Fig. 8 is a diagram of electric fields of different phases of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter at a resonant frequency of 25.9GHz according to the disclosure.
Fig. 9 is a diagram of electric fields of different phases of a coaxial feeding substrate integrated gap waveguide dual-mode band-pass filter at a resonant frequency of 26.4GHz according to the disclosure.
In the figure: 1. an upper dielectric plate; 2. a lower dielectric slab; 3. an EBG structure; 4. a first coaxial feed port; 5. a second coaxial output port; 6 and 7, the strongest positions of the common electric field; 10. an upper conductor plane; 20. a lower conductor plane; 100. a resonant cavity is provided.
Detailed Description
The following detailed description 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 and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 a specific case to those of ordinary skill in the art.
As shown in fig. 1-9, a coaxial 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, the lower dielectric plate 2 is uniformly distributed with a plurality of EBG structures 3 along the edge to form a closed resonant cavity 100 with the upper dielectric plate 1, a first coaxial feed port 4 penetrating through the lower dielectric plate 2 is arranged at the strongest position of a common electric field in the resonant cavity 100, and a second coaxial output port 5 penetrating through the upper dielectric plate 1 is also arranged at the strongest position of the common electric field in the resonant cavity 100; coaxial lines for feeding the resonator 100 are provided at the first coaxial feed port 4 and the second coaxial output port 5.
In the present embodiment, the first coaxial feed port 4 and the second coaxial output port 5 are designed at different positions, and the resonant cavity 100 can excite different TE mode electromagnetic wave resonances. When the first coaxial feed port 4 and the second coaxial output port 5 are located at TE 102 And TE 201 At the position of the strongest common electric field of the modes (which is not the position of the strongest electric field of each mode), the first coaxial feed port 4 excites the TE 102 Time, TE 102 Is coupled with TE 201 ，TE 201 Transmitted out of the second coaxial output port 5 to realize' power feed-TE 102 ——TE 201 -the main coupling path of the output ".
In addition, both the feed and the output excite two modes, namely TE 102 Mode excitation TE 201 Mode, thereby realizing' feeding-TE 201 Output "and" output "TE 102 -two cross-coupling paths of the power feed,thus creating two transmission zeros in the filter characteristic.
As shown in fig. 1, an upper conductor plane 10 of an upper dielectric plate 1 and a lower conductor plane 20 of a lower dielectric plate 2 of a resonant cavity 100 are both coated with copper to form two conductor planes of the resonant cavity 100, and a plurality of EBG structures 3 are uniformly distributed on the lower dielectric plate 2 along the edge to form a closed rectangular resonant cavity 100 with the upper dielectric plate 1.
The structure and topology of the coaxial feed integrated substrate gap waveguide dual-mode band-pass filter will be specifically described below.
As shown in fig. 3 and 4, the two-layer dielectric plate was Rogers RO4003 and had a relative dielectric constant of 3.48. The first coaxial feed port 4 feeds power from the lower dielectric plate 2, the second coaxial output port 5 feeds power from the upper dielectric plate 1, and both ports are inserted into the resonant cavity 100 to feed power to the resonant cavity 100. The first coaxial feed port 4 and the second coaxial output port 5 can be conveniently assembled without feeding from the same layer, the radius of an outer conductor of a coaxial line in the coaxial feed is 0.9mm, the radius of an inner conductor is 0.4mm, and the height of the inner conductor is 0.3mm. The top view of FIG. 4 shows the coordinates (0, y) of the center of the resonator 100, with the two ports being symmetric about the x-axis and located at TE 102 Die and TE 201 Common to the strongest electric fields of the modes, at distances d from both the x-axis and the z-axis w And d L . Length and width L of resonator 100 c ＝5.7mm、W c =6.1mm, other parameters being d W ＝d L ＝2mm、p＝2.2mm、v d =0.6mm and p d ＝1.5mm。
The simulation result of the coaxial feed type integrated substrate gap waveguide dual-mode filter is shown in fig. 5. From
Figure BDA0003991484650000071
As a result, it can be seen that the operating frequency band ranges from 25.6 GHz to 26.7GHz with a center frequency f 0 =26.15GHz, bandwidth BW =1.1GHz, relative bandwidth FBW =4.2%. A transmission zero point (TZ) appears on the left and right of the passband, the transmission zero point TZ1 on the left is-54dB @24GHz, and the transmission zero point TZ2 on the right is-45dB @27.7GHz. The electric fields at the two resonant frequencies are shown in FIG. 6, and it can be seen that the resonant mode at 25.9GHz isTE 102 Mode, the resonant mode at 26.4GHz is TE 201 Mode(s).
In the structure of the invention, an integrated substrate gap waveguide technology is adopted to design a dual-mode band-pass filter, two mode electric fields are formed in a resonant cavity 100, the two mode electric fields are overlapped to form an overlapping area with the strongest electric field, and a first coaxial feed port 4 and a second coaxial output port 5 are arranged at the position of the strongest electric field of the overlapping area, so that dual-mode resonance and transmission zero points around a passband of the filter are realized, and the filter has obvious advantages in filter characteristics.
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:
step S100, using the lower conductor surface of the upper dielectric plate and the upper conductor surface of the 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, exciting a degenerate mode with two orthogonal electric fields in the resonant cavity;
step S400, overlapping the two orthogonal degenerate modes of the electric field in a certain range to form an overlapping area with the strongest electric field;
step S500, arranging a first coaxial feed port penetrating through the lower dielectric plate and a second coaxial output port penetrating through the upper dielectric plate in an overlapped area of a strongest electric field;
step S600, connecting coaxial lines at the first coaxial feed port and the second coaxial output port to enable the two orthogonal degenerate modes of the electric fields to generate coupling.
In this embodiment, fig. 7 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. 8 201 Mode and TE 102 Electric field distribution and feed/output position during mode operation, wherein two strongest positions of the electric field in the horizontal direction (x-axis direction) are TE 201 Mode, TE is the strongest position of two electric fields appearing 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 indicate the locations of the feed and output of the dual-mode resonator.
The positions of the feed and the output are designed at TE 102 Die and TE 201 The strongest common electric field locations of the modes 6 and 7 (which are not the strongest electric field locations of each mode) cause the two modes to couple. Feed excitation TE 102 At mode, TE 201 At the same time coupling TE at the position of the feed 102 Mode, TE 201 The mode is transmitted from the output position, and 'feeding-TE' is realized 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 excitation 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.
In order to more clearly explain the generation principle of the dual-resonance poles and the dual-transmission zeros of the dual-mode filter, fig. 8 and 9 show electric field diagrams of different phases of the integrated substrate gap waveguide (I SGW) dual-mode filter fed by the microstrip ridge at two resonance frequencies of 25.9GHz and 26.4 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. 8, the electric field pattern at 25.9GHz consists of 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. 9, at a frequency of 26.4GHz, the electric field is TE at 0 ° 201 The mode of the operation is set to be,and TE at 70 DEG 102 Mode, mode conversion also takes place, and the other two phases 45 DEG and 110 DEG are TE 102 And TE 201 Similar pattern rotation results.
From the electric field diagram analysis of fig. 9, it can be known 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 excitation 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, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter is characterized by comprising an upper-layer dielectric plate with an upper conductor surface and a lower-layer dielectric plate with a lower conductor surface, wherein a plurality of EBG structures are uniformly distributed on the lower-layer dielectric plate along the edge to form a closed resonant cavity together with the upper-layer dielectric plate, a first coaxial feed port penetrating through the lower-layer dielectric plate is arranged at the strongest position of a public electric field in the resonant cavity, and a second coaxial output port penetrating through the upper-layer dielectric plate is also arranged at the strongest position of the public electric field in the resonant cavity; coaxial lines for feeding the resonant cavity are arranged at the first coaxial feed port and the second coaxial output port.
2. The dual-mode band-pass filter of claim 1, wherein two mutually perpendicular imaginary lines are drawn through a center point of the resonant cavity, and the resonant first and second coaxial feed ports are symmetrically disposed along one of the imaginary lines.
3. The coaxial feed substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein the resonant cavity is a closed rectangular cavity.
4. The coaxial feed substrate integrated gap waveguide dual-mode band-pass filter according to claim 1, wherein the upper dielectric plate and the lower dielectric plate as the dielectric substrate of the circuit board are of the type Rogers RO4003.
5. The coaxial feed substrate integrated gap waveguide dual-mode bandpass 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. A topological method for filtering coupling of a resonant cavity of a substrate integrated gap waveguide is characterized by comprising the following steps:
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;
exciting two degenerate modes with orthogonal electric fields in the resonant cavity;
overlapping the two orthogonal degenerate modes of the electric fields to form an overlapping region with the strongest electric field;
arranging a first coaxial feed port penetrating through the lower dielectric plate and a second coaxial output port penetrating through the upper dielectric plate in an overlapping area of the strongest electric field;
the coaxial lines are connected at the first coaxial feed port and the second coaxial output port, so that the two degenerate modes with orthogonal electric fields are coupled.
7. The substrate-integrated gap waveguide resonator filter coupling topology method of claim 6, wherein the step of providing a first coaxial feed port through the lower dielectric plate and a second coaxial output port through the upper dielectric plate in an overlap region of strongest electric field comprises:
making two mutually perpendicular dotted lines passing through the center of the resonant cavity to divide the resonant cavity into four regions;
the positions of the first coaxial feed port and the second coaxial output port of the resonant cavity are positioned in the centers of the left area and the right area.
8. The method of claim 7, wherein upper and lower dielectric slabs of the Rogers RO4003 model are used as circuit board dielectric substrates.
CN202211581943.9A 2022-12-09 2022-12-09 Coaxial feed type substrate integrated gap waveguide dual-mode band-pass filter and method Pending CN115764208A (en)

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