CN113097670B - Half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal wire - Google Patents
Half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal wire Download PDFInfo
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- CN113097670B CN113097670B CN202110396713.4A CN202110396713A CN113097670B CN 113097670 B CN113097670 B CN 113097670B CN 202110396713 A CN202110396713 A CN 202110396713A CN 113097670 B CN113097670 B CN 113097670B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
Abstract
The invention discloses a half-mode substrate integrated waveguide liquid crystal tunable filter embedded with coupling metal wires, which comprises a half-mode substrate integrated waveguide, wherein the half-mode substrate integrated waveguide comprises a dielectric substrate assembly, the dielectric substrate assembly comprises a first metal layer and a second metal layer arranged opposite to the first metal layer, the first metal layer and the second metal layer are connected through a plurality of metal through holes, the plurality of metal through holes form a through hole array so as to enable the interior of the dielectric substrate assembly to form a substrate integrated guided electromagnetic wave structure, a double-internal rotation type open-loop resonant structure is etched on the first metal layer, the double-internal rotation type open-loop resonant structure comprises two end points which are symmetrically arranged, and the two end points simultaneously extend spirally towards the interior of the ring so as to enable each edge part of the double-internal rotation type open-loop resonant structure to at least comprise 2 etching lines. The half-mode substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal wire can realize the miniaturization of the existing filter and solve the problem that the working frequency of the existing filter is fixed and cannot be adjusted.
Description
Technical Field
The invention relates to the technical field of substrate integrated waveguide, in particular to a half-mode substrate integrated waveguide liquid crystal tunable filter embedded with a coupling metal wire.
Background
Conventional microwave systems typically utilize metal waveguides to transmit electromagnetic waves. Because the metal waveguide structure has a high quality factor, the metal waveguide structure has the advantages of high operation power capacity and low loss. However, the metal waveguide has larger volume and high processing cost, and has integration problem in the modern microwave system. On this basis, therefore, the substrate integrated waveguide technology has been developed. However, because the substrate integrated waveguide is developed based on the metal waveguide, the substrate integrated waveguide inherits the characteristics of low radiation loss, change of working frequency along with change of dielectric constant, larger volume and the like of the traditional metal waveguide, and in consideration of the miniaturization problem, the half-mode substrate integrated waveguide is also proposed so as to be convenient for being integrated into a planar microwave circuit.
When the complementary open-loop resonant structure is loaded on the upper surface of the half-mode substrate integrated waveguide (the complementary open-loop resonant structure has small electrical size and is widely applied to the aspect of realizing the miniaturization of microwave devices), the potential difference between a signal line and the ground can be realized, and evanescent mode resonance is generated to form a pass band. Generally, the pass band is below the cut-off frequency of the half-mode substrate integrated waveguide structure, thereby realizing the miniaturization of the structure. However, the filter based on the conventional complementary open-loop resonant structure has a high passband center frequency, is fixed and cannot be adjusted, and a transmission zero point cannot be reconstructed, which are problems to be improved.
Disclosure of Invention
The invention aims to provide a half-mode substrate integrated waveguide liquid crystal tunable filter embedded with a coupling metal wire, which is used for realizing the miniaturization of the existing half-mode substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal wire and solving the problem that the working frequency of the filter is fixed and cannot be adjusted.
The technical scheme for solving the technical problems is as follows:
the invention provides a half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal wires, wherein the integrated waveguide comprises a dielectric substrate assembly, the dielectric substrate assembly comprises a first metal layer and a second metal layer arranged opposite to the first metal layer, a plurality of metal through holes are formed in the first metal layer and the second metal layer respectively, the first metal layer and the second metal layer are connected through the metal through holes, a double-internal rotation type open-loop resonant structure is etched on the first metal layer and comprises two end points which are symmetrically arranged, and the two end points simultaneously extend towards the inner part of the ring in a spiral mode so that each edge part of the double-internal rotation type open-loop resonant structure at least comprises 2 etching lines.
Optionally, the half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire further includes a metal wire located between the first dielectric substrate and the second dielectric substrate, the metal wire is disposed along a direction perpendicular to a connection direction of the metal through holes, the dielectric substrate assembly further includes two metal blind holes, the two metal blind holes penetrate through the first dielectric substrate, and two end points of the metal wire are respectively connected with the two metal blind holes located at two ends of the dielectric substrate assembly.
Optionally, the dielectric substrate assembly includes a first dielectric substrate and a second dielectric substrate, the first metal layer is disposed on an upper surface of the first dielectric substrate, the second metal layer is disposed on a lower surface of the second dielectric substrate, and the plurality of metal vias sequentially penetrate through the first dielectric substrate and the second dielectric substrate from the first metal layer and then are connected to the second metal layer.
Optionally, the half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire further includes a frequency-affecting medium, and a groove for accommodating the frequency-affecting medium is formed in a surface of the second dielectric substrate away from the second metal layer.
Optionally, the frequency influencing medium is configured as a liquid crystal.
Optionally, the filling thickness of the liquid crystal is equal to the thickness of the second dielectric substrate along the connection direction of the metal through holes.
Optionally, the thickness of the second dielectric substrate is greater than the thickness of the first dielectric substrate along the connection direction of the metal vias.
Optionally, the half-die substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal line comprises a plurality of double-convolution open-loop resonant structures, and the plurality of double-convolution open-loop resonant structures are separated by a slot line etched on the first metal layer.
Optionally, the filling width of the liquid crystal is not less than the width of the double-convolution open-loop resonant structure along a direction perpendicular to the connection direction of the metal via.
The invention has the following beneficial effects:
1. the first metal layer and the second metal layer are connected through a plurality of metal through holes, so that the electromagnetic waves are limited to propagate in the substrate integrated wave guide structure;
2. the double-internal rotation type open-loop resonant structure is in cross coupling with the metal wire, so that the reconfigurable transmission zero of the filter is realized;
3. the double-internal rotation complementary open-loop resonance structure increases the equivalent inductance capacitance, causes the working frequency of the filter to be reduced, and realizes the miniaturization of the electric size of the microwave device;
4. the dielectric constant of the liquid crystal can be regulated by voltage bias, so that the working frequency can be adjusted.
Drawings
FIG. 1 is a schematic three-dimensional layered diagram of a half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to the present invention;
FIG. 2 is a schematic structural diagram of a double-convolution open-loop resonant structure of a half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to the present invention;
FIG. 3 is a top view of a half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to the present invention;
fig. 4 is a graph of S-parameters when the dielectric constant of the liquid crystal of the half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines provided by the present invention takes 2.74-5.44.
Description of the reference numerals
1-a first metal layer; 2-a second metal layer; 3-a metal via; 4-double internal rotation type open loop resonance structure; 41-etching line; 5-a first dielectric substrate; 6-a second dielectric substrate; 7-liquid crystal; 8-groove line; 9-a metal wire; 10-a microstrip line; 11-metal blind via.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
In the present invention, the terms "first", "second", and the like are used for distinguishing one element from another without any explanation to the contrary, and have no sequence or importance. The terms "upper" and "lower" are based on the upper and lower positions of FIG. 1 of the present invention; the terms "inner" and "outer" refer to the relative inner and outer surface contours of an object. In the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements, unless otherwise explained. The foregoing definitions are provided to illustrate and describe the present disclosure only and should not be construed to limit the present disclosure.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The invention provides a half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal wires, which is shown in reference to figures 1 and 2, the half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire comprises a dielectric substrate assembly, the dielectric substrate assembly comprises a first metal layer 1 and a second metal layer 2 arranged opposite to the first metal layer 1, the first metal layer 1 and the second metal layer 2 are connected by a plurality of metal vias 3, the plurality of metal vias 3 forming a via array to generate an equivalent electrical wall, so that a substrate integrated wave guide structure is formed inside the dielectric substrate assembly, a double-internal rotation type open-loop resonant structure 4 is etched on the first metal layer 1, the double inward rotation type open-loop resonant structure 4 comprises two end points which are symmetrically arranged and extend spirally towards the inner part of the ring at the same time, so that each edge part of the double inward rotation type open-loop resonant structure 4 at least comprises 2 etching lines 41.
The invention has the following beneficial effects:
according to the scheme, namely the half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire, provided by the invention, on one hand, the first metal layer 1 and the second metal layer 2 are connected through the plurality of metal through holes 3, so that the electromagnetic waves are limited to propagate in the substrate integrated waveguide structure; on the other hand, the existence of at least 2 etching lines 41 in the double-internal rotation type open-loop resonant structure 4 can increase the equivalent capacitance inductance of the double-internal rotation type open-loop resonant structure, so that lower resonant frequency exists, the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal lines can be miniaturized, and the problems that the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal lines in the prior art is higher in frequency and fixed and cannot be adjusted are further solved.
Besides, the invention also has the following beneficial effects:
the double-internal rotation type open-loop resonant structure is in cross coupling with the metal wire 9, so that the reconfigurable transmission zero of the filter is realized; the dielectric constant of the liquid crystal 7 can be regulated by voltage bias, so that the working frequency can be adjusted.
It should be noted that, the greater the number of the etching lines 41, the lower the operating frequency of the dual-convolution open-loop resonant structure 4, and conversely, the higher the consumption thereof, so that, when a person skilled in the art selects the number of the etching lines 41, the person skilled in the art should design the etching lines by balancing the relationship between the operating frequency and the loss according to the present invention and practical situations, and the present invention is not limited in particular.
Optionally, referring to fig. 1, the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with coupling metal lines further includes metal lines 9 located between the first dielectric substrate 5 and the second dielectric substrate 6. The metal wire 9 is arranged along a direction perpendicular to the connection direction of the metal through holes 3, the dielectric substrate assembly further comprises two metal blind holes 11, the two metal blind holes penetrate through the first dielectric substrate 5, and two end points of the metal wire 9 are respectively connected with the two metal blind holes 11 at two ends of the dielectric substrate assembly.
Here, a dc bias voltage is applied to the liquid crystal 7 through the metal line 9 for controlling the liquid crystal 7. The length of the metal wire 9 does not exceed the length of the dielectric substrate and cannot extend out of the first dielectric substrate 5, so that the two metal blind holes 11 respectively penetrate through the first dielectric substrate 5 to be connected with two end points of the metal wire 9, and the metal wire 9 is pressurized through the metal blind holes 11.
Alternatively, referring to fig. 1, the dielectric substrate assembly includes a first dielectric substrate 5 and a second dielectric substrate 6, the first metal layer 1 is disposed on an upper surface of the first dielectric substrate 5, the second metal layer 2 is disposed on a lower surface of the second dielectric substrate 6, and the plurality of metal vias 3 sequentially penetrate through the first dielectric substrate 5 and the second dielectric substrate 6 from the first metal layer 1 and then are connected to the second metal layer 2.
Optionally, referring to fig. 1, the half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines further includes a frequency-affecting medium, in order to avoid that the frequency-affecting medium directly contacts the first metal layer 1, so that the frequency-affecting medium leaks out of the medium substrate assembly through the double-internal rotation type open-loop resonant structure 4, thereby affecting the etching of the double-internal rotation type open-loop resonant structure 4 on the first metal layer 1, and a surface of the second medium substrate 6, which is away from the second metal layer 2, is provided with a groove for accommodating the frequency-affecting medium. In particular, the invention is not limited to a particular configuration of the frequency influencing medium. In addition, the size and height of the groove can be designed by those skilled in the art according to actual conditions.
Alternatively, in the embodiment provided by the present invention, as shown with reference to fig. 1, the frequency influencing medium is configured as a liquid crystal 7. It is preferable to use a dc voltage bias type liquid crystal 7 so that when a certain dc bias voltage is applied to the liquid crystal 7, the particles of the liquid crystal 7 are changed from anisotropic alignment to vertical alignment or parallel alignment to change the dielectric constant, thereby realizing frequency adjustment.
Alternatively, in the embodiment of the present invention, after a certain dc bias voltage is applied to the liquid crystal 7, the dielectric constant of the liquid crystal 7 is controlled to be 2.74-5.44, and the dielectric constant of the dielectric substrate is 4.38, since the dielectric constant affects the electromagnetic wave, so that the electromagnetic wave tends to a place where the dielectric constant is higher, in order to increase the difference between the dielectric constant of the liquid crystal 7 and the dielectric constant of the dielectric substrate, the filling thickness of the liquid crystal 7 is equal to the thickness of the second dielectric substrate 6 along the connection direction of the metal through hole 3.
Besides, referring to fig. 1, in order to provide a structure that the recess can accommodate a sufficient amount of liquid crystal 7 and make the liquid crystal 7 closer to the first metal layer 1, thereby making the liquid crystal 7 better influence the resonance state, optionally, the thickness of the second dielectric substrate 6 is larger than the thickness of the first dielectric substrate 5 along the connection direction of the metal via 3. Specifically, in the present invention, the thickness of the first dielectric substrate 5 is 0.254mm, and the thickness of the second dielectric substrate 6 is 0.762 mm.
In addition, in the present invention, referring to fig. 1, a microstrip line 10 is further included, which is disposed parallel to the first metal layer 1 and is located on the same horizontal plane, and the microstrip line 10 is used for transmitting electromagnetic waves.
Alternatively, referring to fig. 3, the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with coupling metal lines includes a plurality of double-convolution open-loop resonant structures 4, the plurality of double-convolution open-loop resonant structures 4 are separated by a slot line 8 etched on the first metal layer 1, and two adjacent double-convolution open-loop resonant structures 4 are symmetrical with respect to the slot line 8. Therefore, the surface is used for separating the double internal rotation type open-loop resonant structures 4, the separation of the substrate integrated waveguide resonant units is actually realized after the double internal rotation type open-loop resonant structures 4 are separated, and under the condition that the physical parameters of the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with the coupling metal wire are fixed, the coupling condition between two adjacent double internal rotation type open-loop resonant structures 4 is controlled by adjusting the physical parameters of the slot line 8.
Alternatively, the filling width of the liquid crystal 7 is not smaller than the width of the double-convolution open-loop resonator structure 4 in the direction perpendicular to the connection direction of the metal via 3.
Referring to fig. 4, the metal line 9 forms cross coupling with the double convolution open-loop resonator structure 4, so that the metal line 9 also participates in resonance, and the width, length and position of the metal line 9 are important parameters for determining the coupling of the metal line 9 with the double convolution open-loop resonator structure 4. Two transmission zeros originally positioned on the right side of the passband are changed into two transmission zeros on two sides of the passband, and the reconstruction of the transmission zeros is realized. Here, as shown in fig. 4, the pass band range is the region where S21 is greater than-3 dB, and the transmission zero point is the point where S21 is the smallest.
Referring to fig. 4, the horizontal axis represents frequency (GHz), the vertical axis represents scattering coefficient parameter (dB), the bandpass filter of the present embodiment has good performance, the center operating frequency can be shifted from 1.02GHz to 1.16GHz, the minimum insertion loss in the passband is 1.59dB, the return loss is less than-12 dB, and the stop band rejection is below-40 dB. Therefore, the band-pass filter provided by the invention can realize frequency reduction and adjustment, realizes transmission zero point reconstruction, and has great reference value in the design and application of a planar circuit combining a novel structure of the half-mode substrate integrated waveguide liquid crystal adjustable filter embedded with the coupling metal wire.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire is characterized by comprising a half-mode substrate integrated waveguide, wherein the half-mode substrate integrated waveguide comprises a medium substrate assembly, the medium substrate assembly comprises a first metal layer (1) and a second metal layer (2) opposite to the first metal layer (1), the first metal layer (1) and the second metal layer (2) are connected through a plurality of metal through holes (3), the plurality of metal through holes (3) form a through hole array so that a substrate integrated wave guide structure is formed inside the medium substrate assembly, a double-internal rotation type open-loop resonant structure (4) is etched on the first metal layer (1), and the double-internal rotation type open-loop resonant structure (4) comprises two end points which are symmetrically arranged, the two end points simultaneously extend towards the inner part of the ring in a spiral mode so that each edge part of the double-internal rotation type open-loop resonant structure (4) at least comprises 2 etching lines (41), the dielectric substrate assembly further comprises a first dielectric substrate (5) and a second dielectric substrate (6), the first metal layer (1) is laid on the upper surface of the first dielectric substrate (5), the second metal layer (2) is laid on the lower surface of the second dielectric substrate (6), and the metal through holes (3) sequentially penetrate through the first dielectric substrate (5) and the second dielectric substrate (6) from the first metal layer (1) and then are connected with the second metal layer (2);
the half-die substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire further comprises a metal wire (9) positioned between the first dielectric substrate (5) and the second dielectric substrate (6). The metal wire (9) is arranged along a direction perpendicular to the connecting direction of the metal through holes (3), the dielectric substrate assembly further comprises two metal blind holes (11), the two metal blind holes penetrate through the first dielectric substrate (5), and two end points of the metal wire (9) are respectively connected with the two metal blind holes (11) at two ends of the dielectric substrate assembly;
the half-mode substrate integrated waveguide liquid crystal tunable filter with the embedded coupling metal wire further comprises a frequency-influencing medium, and a groove for accommodating the frequency-influencing medium is formed in one surface, away from the second metal layer (2), of the second medium substrate (6);
the frequency-influencing medium is designed as a liquid crystal (7).
2. Half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to claim 1, characterized in that the filling thickness of the liquid crystal (7) is equal to the thickness of the second dielectric substrate (6) along the connection direction of the metal vias (3).
3. Half-mode substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to claim 1, characterized in that the filling width of the liquid crystal (7) is not smaller than the width of the double-convolution open-loop resonator structure (4) along the direction perpendicular to the connection direction of the metal vias (3).
4. Half-die substrate integrated waveguide liquid crystal tunable filter with embedded coupling metal lines according to claim 1, characterized in that the thickness of the second dielectric substrate (6) is larger than the thickness of the first dielectric substrate (5) along the connection direction of the metal vias (3).
5. The half-mode substrate integrated waveguide liquid crystal tunable filter embedded with coupling metal lines according to claim 1, characterized in that the half-mode substrate integrated waveguide liquid crystal tunable filter embedded with coupling metal lines comprises a plurality of double-convolution open-loop resonant structures (4), the plurality of double-convolution open-loop resonant structures (4) being separated by slot lines (8) etched on the first metal layer (1).
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| CN113937446B (en) * | 2021-11-26 | 2022-04-19 | 西华大学 | Fence type low-loss broadband negative group time delay compensation circuit and design method thereof |
| CN115332743B (en) * | 2022-07-28 | 2023-11-10 | 西安空间无线电技术研究所 | Terahertz reconfigurable filter with planar mask structure and preparation method |
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