CN117638437B - Waveguide bandpass filter and electrical apparatus - Google Patents
Waveguide bandpass filter and electrical apparatus Download PDFInfo
- Publication number
- CN117638437B CN117638437B CN202410103036.6A CN202410103036A CN117638437B CN 117638437 B CN117638437 B CN 117638437B CN 202410103036 A CN202410103036 A CN 202410103036A CN 117638437 B CN117638437 B CN 117638437B
- Authority
- CN
- China
- Prior art keywords
- cavity
- waveguide
- resonant cavity
- resonant
- bandpass filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002184 metal Substances 0.000 claims abstract description 60
- 230000008878 coupling Effects 0.000 claims abstract description 50
- 238000010168 coupling process Methods 0.000 claims abstract description 50
- 238000005859 coupling reaction Methods 0.000 claims abstract description 50
- 230000004044 response Effects 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 description 17
- 238000001914 filtration Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention provides a waveguide bandpass filter and an electrical device. The filter provided by the invention comprises an input waveguide cavity, a first resonant cavity, an output waveguide cavity and a second resonant cavity; a first common wall is arranged between the input waveguide cavity and the output waveguide cavity, and a second common wall is arranged between the first resonant cavity and the second resonant cavity; the input waveguide cavity is isolated from the first resonant cavity by a first metal diaphragm, and the output waveguide cavity is isolated from the second resonant cavity by a second metal diaphragm; a first gap is formed in the middle of the second public wall, and the length of the first gap is equal to one half of the free space wavelength corresponding to the center frequency of the filter; the first metal diaphragm is provided with a first coupling window which is communicated with the input waveguide cavity and the first resonant cavity, and the second metal diaphragm is provided with a second coupling window which is communicated with the output waveguide cavity and the second resonant cavity. The invention provides a waveguide band-pass filter and electrical equipment, wherein three-order band-pass filter response can be realized by two waveguide resonant cavities, and the size of the filter is reduced.
Description
Technical Field
The present invention relates to the field of filters, and in particular, to a waveguide bandpass filter and an electrical device.
Background
The filter is a frequency selecting device which can pass specific frequency components in the signal and greatly attenuate other frequency components, and the interference noise can be filtered or the spectrum analysis can be carried out by utilizing the frequency selecting function of the filter.
At present, with the rapid development of broadband communication and carrier aggregation technology, the research in the broadband communication field is increasingly active, and for waveguide bandpass filters, broadband design is mainly realized by cascading multistage single-mode resonant cavities.
However, the existing cascade design requires N (N is a positive integer) waveguide resonators to achieve a bandpass filter response of order N, and as the cascade order increases, the volume of the filter increases substantially.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a waveguide band-pass filter and an electrical device, and the three-order band-pass filter response can be realized by only using two waveguide resonant cavities, so that the volume of the filter is reduced.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, the present invention provides a waveguide bandpass filter comprising a first waveguide cavity and a second waveguide cavity, the first waveguide cavity comprising an input waveguide cavity and a first resonant cavity, the second waveguide cavity comprising an output waveguide cavity and a second resonant cavity; a first common wall is arranged between the input waveguide cavity and the output waveguide cavity so that the input waveguide cavity and the output waveguide cavity are adjacent along a first direction, and a second common wall is arranged between the first resonant cavity and the second resonant cavity so that the first resonant cavity and the second resonant cavity are adjacent along the first direction;
in the second direction, the input waveguide cavity and the first resonant cavity are isolated by the first metal diaphragm, and the output waveguide cavity and the second resonant cavity are isolated by the second metal diaphragm;
a first gap extending along a third direction is formed in the middle of the second public wall, the first gap is communicated with the first resonant cavity and the second resonant cavity, and the length of the first gap along the third direction is equal to one half of the free space wavelength corresponding to the center frequency of the filter;
the first metal diaphragm is provided with a first coupling window which is communicated with the input waveguide cavity and the first resonant cavity, and the second metal diaphragm is provided with a second coupling window which is communicated with the output waveguide cavity and the second resonant cavity;
the cavity wall of the input waveguide cavity opposite to the first metal diaphragm is used as an input end of the filter, the cavity wall of the output waveguide cavity opposite to the second metal diaphragm is used as an output end of the filter, and the first direction, the second direction and the third direction are perpendicular to each other.
As an alternative implementation mode, a second gap which is communicated with the first resonant cavity and the second resonant cavity is further formed in the second public wall, the second gap extends along the third direction, the second gap and the first gap are arranged at intervals along the second direction, and the length of the second gap along the third direction is smaller than that of the first gap along the third direction.
As an alternative embodiment, the second slit is located between the first slit and the first metal film sheet.
As an alternative embodiment, the first metal film sheet and the second metal film sheet are symmetrically arranged with respect to the first common wall.
As an alternative embodiment, the first coupling window and the second coupling window are symmetrically arranged about the first common wall.
As an alternative embodiment, the first common wall and the second common wall lie in the same plane.
As an alternative embodiment, the first coupling window is located at a middle portion of the first metal film sheet in the third direction, and the second coupling window is located at a middle portion of the second metal film sheet in the third direction.
As an alternative embodiment, the length of the second common wall in the second direction is greater than the length of the first common wall in the second direction, and the length of the second common wall in the third direction is less than the corresponding half waveguide wavelength at the filter center frequency.
As an alternative embodiment, the waveguide bandpass filter has a rectangular parallelepiped shape.
In a second aspect, the invention also provides an electrical device comprising a waveguide bandpass filter according to any one of the first aspects.
The waveguide bandpass filter provided by the invention comprises a first waveguide cavity and a second waveguide cavity, wherein the first waveguide cavity comprises an input waveguide cavity and a first resonant cavity, and the second waveguide cavity comprises an output waveguide cavity and a second resonant cavity; a first common wall is arranged between the input waveguide cavity and the output waveguide cavity so that the input waveguide cavity and the output waveguide cavity are adjacent along a first direction, and a second common wall is arranged between the first resonant cavity and the second resonant cavity so that the first resonant cavity and the second resonant cavity are adjacent along the first direction; in the second direction, the input waveguide cavity and the first resonant cavity are isolated by the first metal diaphragm, and the output waveguide cavity and the second resonant cavity are isolated by the second metal diaphragm; a first gap extending along a third direction is formed in the middle of the second public wall, the first gap is communicated with the first resonant cavity and the second resonant cavity, and the length of the first gap along the third direction is equal to one half of the free space wavelength corresponding to the center frequency of the filter; the first metal diaphragm is provided with a first coupling window which is communicated with the input waveguide cavity and the first resonant cavity, and the second metal diaphragm is provided with a second coupling window which is communicated with the output waveguide cavity and the second resonant cavity; the cavity wall of the input waveguide cavity opposite to the first metal diaphragm is used as an input end of the filter, the cavity wall of the output waveguide cavity opposite to the second metal diaphragm is used as an output end of the filter, and the first direction, the second direction and the third direction are perpendicular to each other. According to the waveguide band-pass filter provided by the invention, the first gap is formed in the middle of the second public wall, so that the first gap can couple between the first resonant cavity and the second resonant cavity, and the first gap can be used as a primary resonator, therefore, compared with the traditional three-cavity three-order cascade waveguide band-pass filter, the waveguide band-pass filter provided by the invention can realize the response and the function of three-order band-pass filtering by using only two resonant cavities, the use of the primary resonant cavity is reduced, and the structure of the filter is more compact.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of a waveguide bandpass filter according to an embodiment of the invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a side view of FIG. 1;
FIG. 5 is a schematic diagram of a coupling path of a waveguide bandpass filter according to an embodiment of the invention;
FIG. 6 is a graph showing the change of transmission coefficient and reflection coefficient of a waveguide band-pass filter with a first slot according to an embodiment of the present invention at different frequencies;
fig. 7 is a graph showing the change of the transmission coefficient and the reflection coefficient of the waveguide band-pass filter with the first slot and the second slot under different frequencies according to the embodiment of the present invention.
Reference numerals illustrate:
a 100-filter;
110-a first waveguide cavity;
111-an input waveguide cavity;
112-a first resonant cavity;
120-a second waveguide cavity;
121-an output waveguide cavity;
122-a second resonant cavity;
130-a first common wall;
140-a second common wall;
141-a first gap;
142-a second gap;
150-a first metal diaphragm;
151-a first coupling window;
160-a second metal diaphragm;
161-a second coupling window;
170-input terminal;
180-output terminal;
y-a first direction;
z-a second direction;
x-third direction.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The existing waveguide band-pass filter mainly realizes broadband design by cascading multistage single-mode resonant cavities, however, the existing cascading design can greatly increase the size of the filter along with the increase of the cascading orders of the filter.
In view of this, the present invention provides a waveguide bandpass filter comprising a first waveguide cavity including an input waveguide cavity and a first resonant cavity, and a second waveguide cavity including an output waveguide cavity and a second resonant cavity; a first common wall is arranged between the input waveguide cavity and the output waveguide cavity so that the input waveguide cavity and the output waveguide cavity are adjacent along a first direction, and a second common wall is arranged between the first resonant cavity and the second resonant cavity so that the first resonant cavity and the second resonant cavity are adjacent along the first direction; in the second direction, the input waveguide cavity and the first resonant cavity are isolated by the first metal diaphragm, and the output waveguide cavity and the second resonant cavity are isolated by the second metal diaphragm; a first gap extending along a third direction is formed in the middle of the second public wall, the first gap is communicated with the first resonant cavity and the second resonant cavity, and the length of the first gap along the third direction is equal to one half of the free space wavelength corresponding to the center frequency of the filter; the first metal diaphragm is provided with a first coupling window which is communicated with the input waveguide cavity and the first resonant cavity, and the second metal diaphragm is provided with a second coupling window which is communicated with the output waveguide cavity and the second resonant cavity; the cavity wall of the input waveguide cavity opposite to the first metal diaphragm is used as an input end of the filter, and the cavity wall of the output waveguide cavity opposite to the second metal diaphragm is used as an output end of the filter. According to the waveguide band-pass filter provided by the invention, the first gap is formed in the middle of the second public wall, so that the first gap can be used for coupling between the first resonant cavity and the second resonant cavity, and the first gap can be used as a primary resonator, therefore, the response and the function of third-order band-pass filtering can be realized by only using two resonant cavities, the use of the primary resonant cavity is reduced, and the structure of the filter is more compact.
Fig. 1 is a schematic diagram of the overall structure of a waveguide bandpass filter according to an embodiment of the invention; FIG. 2 is a front view of FIG. 1; FIG. 3 is a top view of FIG. 1; FIG. 4 is a side view of FIG. 1; FIG. 5 is a schematic diagram of a coupling path of a waveguide bandpass filter according to an embodiment of the invention; FIG. 6 is a graph showing the change of transmission coefficient and reflection coefficient of a waveguide band-pass filter with a first slot according to an embodiment of the present invention at different frequencies; fig. 7 is a graph showing the change of the transmission coefficient and the reflection coefficient of the waveguide band-pass filter with the first slot and the second slot under different frequencies according to the embodiment of the present invention. Referring to fig. 1 to 7, an embodiment of the present invention provides a waveguide bandpass filter 100 including a first waveguide cavity 110 and a second waveguide cavity 120, the first waveguide cavity 110 including an input waveguide cavity 111 and a first resonant cavity 112, the second waveguide cavity 120 including an output waveguide cavity 121 and a second resonant cavity 122; a first common wall 130 is provided between the input waveguide cavity 111 and the output waveguide cavity 121 such that the input waveguide cavity 111 and the output waveguide cavity 121 are adjacent in the first direction Y, and a second common wall 140 is provided between the first resonant cavity 112 and the second resonant cavity 122 such that the first resonant cavity 112 and the second resonant cavity 122 are adjacent in the first direction Y; in the second direction Z, the input waveguide cavity 111 and the first resonator cavity 112 are isolated by the first metal film 150, and the output waveguide cavity 121 and the second resonator cavity 122 are isolated by the second metal film 160; a first gap 141 extending along a third direction X is formed in the middle of the second common wall 140, the first gap 141 communicates the first resonant cavity 112 and the second resonant cavity 122, and the length of the first gap 141 along the third direction X is equal to a half of the free space wavelength corresponding to the center frequency of the filter 100; the first metal diaphragm 150 is provided with a first coupling window 151 which is communicated with the input waveguide cavity 111 and the first resonant cavity 112, and the second metal diaphragm 160 is provided with a second coupling window 161 which is communicated with the output waveguide cavity 121 and the second resonant cavity 122; wherein a cavity wall of the input waveguide cavity 111 opposite to the first metal diaphragm 150 serves as an input end 170 of the filter 100, and a cavity wall of the output waveguide cavity 121 opposite to the second metal diaphragm 160 serves as an output end 180 of the filter 100, the first direction Y, the second direction Z, and the third direction X are perpendicular to each other.
As shown in fig. 1, in the foregoing embodiment, the waveguide bandpass filter 100 may have a rectangular parallelepiped shape, and it is understood that energy may enter from the input end 170, enter the first resonant cavity 112 through the first coupling window 151, enter the second resonant cavity 122 through the first slot 141, and then exit from the output end 180 after passing through the second coupling window 161.
The first coupling window 151 and the second coupling window 161 may be symmetrically disposed with respect to the first common wall 130, and the first coupling window 151 may be positioned at a middle portion of the first metal diaphragm 150 along the third direction X, and the second coupling window 161 may be positioned at a middle portion of the second metal diaphragm 160 along the third direction X, so as to ensure uniformity of energy transmission. The sizes of the first coupling window 151 and the second coupling window 161 may be set according to actual needs. Wherein the first common wall 130 and the second common wall 140 may be located in the same plane.
The waveguide bandpass filter 100 provided by the embodiment of the invention has the advantages that the first gap 141 is formed in the middle of the second common wall 140, the first gap 141 can enable the first resonant cavity 112 and the second resonant cavity 122 to be coupled, and the first gap 141 can also be used as a primary resonator, so that compared with the traditional three-cavity three-order cascade waveguide bandpass filter 100, the waveguide bandpass filter 100 provided by the invention can realize the response and the function of three-order bandpass filtering by using only two resonant cavities, the use of primary resonant cavities is reduced, and the structure of the filter 100 is more compact.
In the above embodiment, the second common wall 140 is further provided with a second slit 142 that communicates the first resonant cavity 112 and the second resonant cavity 122, the second slit 142 extends along the third direction X, the second slit 142 and the first slit 141 are disposed at intervals along the second direction Z, and the length of the second slit 142 along the third direction X is smaller than the length of the first slit 141 along the third direction X. Wherein, the second gap 142 can additionally introduce a coupling path, so that an additional transmission zero point can be introduced at a high frequency, and the suppression level of the upper sideband is improved; the position of the high frequency zero point can be flexibly controlled by adjusting the length and width of the second slit 142 and the distance from the first slit 141. Specifically, the second slit 142 may be opened between the first slit 141 and the second metal plate.
In the above embodiment, the length of the second common wall 140 along the second direction Z may be greater than the length of the first common wall 130 along the second direction Z, and the length of the second common wall 140 along the third direction X may be less than the corresponding half waveguide wavelength at the center frequency of the filter 100.
The waveguide bandpass filter 100 provided in the embodiment of the invention etches a half-wavelength coupling slot (the first slot 141) on the central wide wall of two waveguide resonant cavities symmetrical along the wide wall (Y-axis direction), and the half-wavelength coupling slot can generate additional resonance points in the passband while providing energy coupling of the two waveguide resonant cavities, so that a third-order bandpass filter response can be easily obtained by using the two waveguide resonant cavities.
As shown in fig. 5, where S represents input 170, L represents output 180, and 1 represents the first harmonicThe resonant cavity 112,2 represents the first gap 141,3 represents the second resonant cavity 122, M s1 M is the normalized coupling coefficient between the input 170 and the first resonator 112 3L M is the normalized coupling coefficient between the second resonant cavity 122 and the output terminal 180 12 M is the normalized coupling coefficient between the first resonant cavity 112 and the first slit 141 23 Normalized coupling coefficient, M, between first slot 141 and second resonant cavity 122 13 Is the normalized cross-coupling coefficient between the non-adjacent first 112 and second 122 resonant cavities brought about by the first gap 141.
The calculation formula of the parameters is as follows:
in the above formula, the FBW is a relative bandwidth of 3dB (3 dB), and the specific calculation method is as follows: 3dB bandwidth/center frequency;k 12 (1 for i)k ii+1 ) As a coupling coefficient between the first resonator 112 and the first slit 141,k 23 (when i is taken to be 2)k ii+1 ) Is the coupling coefficient between the first slot 141 and the second resonator 122.
It will be appreciated that the first slot 141, in addition to providing coupling between the first resonant cavity 112 and the second resonant cavity 122, may be used as a primary resonator, providing an additional cross-coupling path between two non-adjacent resonant cavities; and the external figures of merit of the input 170 and output 180 may be controlled by varying the sizes of the first coupling window 151 and the second coupling window 161, thereby changing M s1 And M 3L Is a value of (2); and M can be changed by adjusting the width of the first gap 141 and the distance between the first gap 141 and the first resonant cavity 112 along the second direction Z 12 、M 23 M is as follows 13 Is a value of (2).
As shown in FIG. 6, the abscissa thereof is frequency (in gigahertz (GHz)), and the ordinate thereof is the reflection coefficient (S) of the waveguide bandpass filter with the first slit 141 11 ) And transmission coefficient (S) 21 ) Corresponding amplitude values (in dB) ofIn which the curve marked with a square frame shape is the reflectance (S 11 ) The curve marked with a triangle shape is a transmission coefficient (S 21 ) From the graph, the reflection coefficient (S 11 ) As can be seen from the frequency dependence, the waveguide bandpass filter with the first slot 141 exhibits a third-order bandpass filter response, i.e. three transmission poles in the passband and a return loss value below-18 dB, from which the transmission coefficient (S 21 ) As can be seen from the frequency variation curve, the minimum insertion loss in the passband is 0.005dB, and the passband has a transmission zero point on the upper sideband (about 4 GHz), and the out-of-band rejection level of the upper sideband is more than or equal to 28dB.
As shown in FIG. 7, the abscissa thereof is frequency (in gigahertz (GHz)), and the ordinate thereof is the reflection coefficient (S) of the waveguide bandpass filter with the first slot 141 and the second slot 142 11 ) And transmission coefficient (S) 21 ) Corresponding amplitude values (in dB), wherein the curve marked with a square shape is the reflection coefficient (S 11 ) The curve marked with a triangle shape is a transmission coefficient (S 21 ) From the reflection coefficient (S 11 ) As can be seen from the frequency dependence, the waveguide bandpass filter with the first slot 141 and the second slot 142 exhibits a third order bandpass filter response, i.e. three transmission poles in the passband, with a return loss value below-20 dB, from the transmission coefficient (S 21 ) As can be seen from the frequency dependence, the minimum insertion loss in the passband is 0.0001dB, compared with the transmission coefficient (S 21 ) As a function of frequency, it can be seen that the upper sideband creates an additional transmission zero due to the introduction of the second slot 142, and the upper sideband out-of-band rejection level is increased (. Gtoreq.30 dB).
The waveguide bandpass filter 100 provided by the embodiment of the invention includes a first waveguide cavity 110 and a second waveguide cavity 120, the first waveguide cavity 110 includes an input waveguide cavity 111 and a first resonant cavity 112, and the second waveguide cavity 120 includes an output waveguide cavity 121 and a second resonant cavity 122; a first common wall 130 is provided between the input waveguide cavity 111 and the output waveguide cavity 121 such that the input waveguide cavity 111 and the output waveguide cavity 121 are adjacent in the first direction Y, and a second common wall 140 is provided between the first resonant cavity 112 and the second resonant cavity 122 such that the first resonant cavity 112 and the second resonant cavity 122 are adjacent in the first direction Y; in the second direction Z, the input waveguide cavity 111 and the first resonator cavity 112 are isolated by the first metal film 150, and the output waveguide cavity 121 and the second resonator cavity 122 are isolated by the second metal film 160; a first gap 141 extending along a third direction X is formed in the middle of the second common wall 140, the first gap 141 communicates the first resonant cavity 112 and the second resonant cavity 122, and the length of the first gap 141 along the third direction X is equal to a half of the free space wavelength corresponding to the center frequency of the filter 100; the first metal diaphragm 150 is provided with a first coupling window 151 which is communicated with the input waveguide cavity 111 and the first resonant cavity 112, and the second metal diaphragm 160 is provided with a second coupling window 161 which is communicated with the output waveguide cavity 121 and the second resonant cavity 122; wherein a cavity wall of the input waveguide cavity 111 opposite to the first metal diaphragm 150 serves as an input end 170 of the filter 100, and a cavity wall of the output waveguide cavity 121 opposite to the second metal diaphragm 160 serves as an output end 180 of the filter 100, the first direction Y, the second direction Z, and the third direction X are perpendicular to each other.
The waveguide bandpass filter 100 provided by the embodiment of the invention has the advantages that the first gap 141 is formed in the middle of the second common wall 140, the first gap 141 can enable the first resonant cavity 112 and the second resonant cavity 122 to be coupled, and the first gap 141 can also be used as a primary resonator, so that compared with the traditional three-cavity three-order cascade waveguide bandpass filter 100, the waveguide bandpass filter 100 provided by the invention can realize the response and the function of three-order bandpass filtering by using only two resonant cavities, the use of primary resonant cavities is reduced, and the structure of the filter 100 is more compact. In addition, the waveguide band-pass filter 100 provided by the embodiment of the invention has the performance advantages of miniaturization, low insertion loss and high selectivity, the minimum insertion loss in the band is about 0.0001dB, the out-of-band suppression level of the upper sideband is more than or equal to 30dB, and the high-frequency zero point is controllable.
In addition, the embodiment of the present invention further provides an electrical device, where the electrical device includes the waveguide bandpass filter 100 in any one of the above embodiments, where the waveguide bandpass filter 100 includes a first waveguide cavity 110 and a second waveguide cavity 120, the first waveguide cavity 110 includes an input waveguide cavity 111 and a first resonant cavity 112, and the second waveguide cavity 120 includes an output waveguide cavity 121 and a second resonant cavity 122; a first common wall 130 is provided between the input waveguide cavity 111 and the output waveguide cavity 121 such that the input waveguide cavity 111 and the output waveguide cavity 121 are adjacent in the first direction Y, and a second common wall 140 is provided between the first resonant cavity 112 and the second resonant cavity 122 such that the first resonant cavity 112 and the second resonant cavity 122 are adjacent in the first direction Y; in the second direction Z, the input waveguide cavity 111 and the first resonator cavity 112 are isolated by the first metal film 150, and the output waveguide cavity 121 and the second resonator cavity 122 are isolated by the second metal film 160; a first gap 141 extending along a third direction X is formed in the middle of the second common wall 140, the first gap 141 communicates the first resonant cavity 112 and the second resonant cavity 122, and the length of the first gap 141 along the third direction X is equal to a half of the free space wavelength corresponding to the center frequency of the filter 100; the first metal diaphragm 150 is provided with a first coupling window 151 which is communicated with the input waveguide cavity 111 and the first resonant cavity 112, and the second metal diaphragm 160 is provided with a second coupling window 161 which is communicated with the output waveguide cavity 121 and the second resonant cavity 122; wherein the cavity wall of the input waveguide cavity 111 opposite the first metal diaphragm 150 serves as the input 170 of the filter 100 and the cavity wall of the output waveguide cavity 121 opposite the second metal diaphragm 160 serves as the output 180 of the filter 100.
The waveguide band-pass filter 100 is provided with the first gap 141 in the middle of the second common wall 140, the first gap 141 can enable the first resonant cavity 112 and the second resonant cavity 122 to be coupled, the first gap 141 can also be used as a primary resonator, the waveguide band-pass filter 100 can realize the response and the function of third-order band-pass filtering by only using two resonant cavities, the use of the primary resonant cavity is reduced, and the structure of the electrical equipment is more compact.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A waveguide bandpass filter comprising a first waveguide cavity and a second waveguide cavity, the first waveguide cavity comprising an input waveguide cavity and a first resonant cavity, the second waveguide cavity comprising an output waveguide cavity and a second resonant cavity; a first common wall is arranged between the input waveguide cavity and the output waveguide cavity so that the input waveguide cavity and the output waveguide cavity are adjacent along a first direction, and a second common wall is arranged between the first resonant cavity and the second resonant cavity so that the first resonant cavity and the second resonant cavity are adjacent along the first direction;
in a second direction, the input waveguide cavity and the first resonant cavity are isolated by a first metal diaphragm, and the output waveguide cavity and the second resonant cavity are isolated by a second metal diaphragm;
a first gap extending along a third direction is formed in the middle of the second public wall, the first gap is communicated with the first resonant cavity and the second resonant cavity, and the length of the first gap along the third direction is equal to one half of the free space wavelength corresponding to the center frequency of the filter;
the first metal diaphragm is provided with a first coupling window which is communicated with the input waveguide cavity and the first resonant cavity, and the second metal diaphragm is provided with a second coupling window which is communicated with the output waveguide cavity and the second resonant cavity;
the cavity wall, opposite to the first metal diaphragm, of the input waveguide cavity is used as an input end of the filter, the cavity wall, opposite to the second metal diaphragm, of the output waveguide cavity is used as an output end of the filter, and the first direction, the second direction and the third direction are perpendicular to each other.
2. The waveguide bandpass filter according to claim 1, wherein the second common wall is further provided with a second slit communicating the first resonant cavity and the second resonant cavity, the second slit extends along the third direction, the second slit and the first slit are arranged at intervals along the second direction, and a length of the second slit along the third direction is smaller than a length of the first slit along the third direction.
3. The waveguide bandpass filter according to claim 2, wherein the second slit is located between the first slit and the first metal diaphragm.
4. A waveguide bandpass filter according to claim 3, wherein the first and second metal diaphragms are symmetrically arranged about the first common wall.
5. The waveguide bandpass filter according to claim 4, wherein the first coupling window and the second coupling window are symmetrically arranged about the first common wall.
6. The waveguide bandpass filter according to claim 5, wherein the first common wall and the second common wall lie in the same plane.
7. The waveguide bandpass filter according to claim 6, wherein the first coupling window is located in a middle of the first metal film sheet in the third direction, and the second coupling window is located in a middle of the second metal film sheet in the third direction.
8. The waveguide bandpass filter according to claim 7, wherein the length of the second common wall along the second direction is greater than the length of the first common wall along the second direction, and the length of the second common wall along the third direction is less than a corresponding half waveguide wavelength at the filter center frequency.
9. The waveguide bandpass filter according to any one of claims 1-8, wherein the waveguide bandpass filter has a rectangular parallelepiped shape.
10. An electrical device comprising a waveguide bandpass filter according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410103036.6A CN117638437B (en) | 2024-01-25 | 2024-01-25 | Waveguide bandpass filter and electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410103036.6A CN117638437B (en) | 2024-01-25 | 2024-01-25 | Waveguide bandpass filter and electrical apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117638437A CN117638437A (en) | 2024-03-01 |
| CN117638437B true CN117638437B (en) | 2024-04-09 |
Family
ID=90016674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410103036.6A Active CN117638437B (en) | 2024-01-25 | 2024-01-25 | Waveguide bandpass filter and electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117638437B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599564A (en) * | 2009-07-09 | 2009-12-09 | 华南理工大学 | Controllable electromagnetic coupling microstrip split-ring resonator filter |
| CN102394568A (en) * | 2011-10-19 | 2012-03-28 | 电子科技大学 | W-band broadband mixer |
| KR20200062006A (en) * | 2018-11-26 | 2020-06-03 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Filter and Manufacturing Method Thereof |
| CN113131148A (en) * | 2019-12-31 | 2021-07-16 | 深圳市大富科技股份有限公司 | Communication device and filter thereof |
| WO2021213630A1 (en) * | 2020-04-21 | 2021-10-28 | Nokia Technologies Oy | A resonant device comprising resonant elements within a resonant cavity |
| CN114284673A (en) * | 2021-12-29 | 2022-04-05 | 杭州电子科技大学 | Substrate integrated waveguide dual-band filtering balun |
-
2024
- 2024-01-25 CN CN202410103036.6A patent/CN117638437B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599564A (en) * | 2009-07-09 | 2009-12-09 | 华南理工大学 | Controllable electromagnetic coupling microstrip split-ring resonator filter |
| CN102394568A (en) * | 2011-10-19 | 2012-03-28 | 电子科技大学 | W-band broadband mixer |
| KR20200062006A (en) * | 2018-11-26 | 2020-06-03 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Filter and Manufacturing Method Thereof |
| CN113131148A (en) * | 2019-12-31 | 2021-07-16 | 深圳市大富科技股份有限公司 | Communication device and filter thereof |
| WO2021213630A1 (en) * | 2020-04-21 | 2021-10-28 | Nokia Technologies Oy | A resonant device comprising resonant elements within a resonant cavity |
| CN114284673A (en) * | 2021-12-29 | 2022-04-05 | 杭州电子科技大学 | Substrate integrated waveguide dual-band filtering balun |
Non-Patent Citations (1)
| Title |
|---|
| 小型化基片集成波导滤波器研究进展;张怿成;刘方毅;孟志豪;;电子世界;20181023(第20期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117638437A (en) | 2024-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1990863B1 (en) | Dual band resonator and dual band filter | |
| CN110400995B (en) | Small-sized wide-stop-band HMSIW single-cavity three-mode band-pass filter | |
| JP2008543192A (en) | Microwave filter with end wall connectable to coaxial resonator | |
| US11309682B2 (en) | Millimeter wave LTCC filter | |
| CN105958164A (en) | Cross-coupled bandpass filter with suspended strip lines | |
| US6169466B1 (en) | Corrugated waveguide filter having coupled resonator cavities | |
| CN109088134B (en) | Microstrip band-pass filter | |
| CN109830789B (en) | Broadband band-pass filter based on folded substrate integrated waveguide and complementary split ring resonator | |
| CN111403861B (en) | UIR loaded three-order dual-passband substrate integrated waveguide filter | |
| CN117638437B (en) | Waveguide bandpass filter and electrical apparatus | |
| CN108879043A (en) | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure | |
| EP0605642A1 (en) | Narrow band-pass, wide band-stop filter | |
| CN112072242A (en) | Filter structure and filter | |
| CN111613861A (en) | Dual-mode SIW filter with wide stop-band rejection | |
| CN111293390A (en) | UIR loaded three-order dual-passband substrate integrated waveguide filter | |
| CN115084808B (en) | Broadband common mode rejection balanced microstrip line band-pass filter | |
| CN110828951A (en) | Ridge waveguide band-pass filter and filtering structure | |
| CN113224488B (en) | Wide-stopband substrate integrated waveguide filtering power divider | |
| CN108847516A (en) | A kind of evaporative pattern waveguide high-pass filter | |
| CN212434808U (en) | Filter structure and filter | |
| CN209747694U (en) | Low-pass filter with complementary split resonant ring and U-shaped groove defected ground | |
| CN110896163A (en) | Dielectric waveguide filter capable of realizing single out-of-band transmission zero | |
| Yuan et al. | Design of tunable balanced dual-band filter using SIR and EMSIW | |
| CN110556617A (en) | Miniaturized high-isolation vehicle-mounted radio frequency signal separator | |
| KR20070061093A (en) | The band rejection filter using dielectric waveguide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |