CN108777341B - Tunable filter - Google Patents
Tunable filter Download PDFInfo
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- CN108777341B CN108777341B CN201810533044.9A CN201810533044A CN108777341B CN 108777341 B CN108777341 B CN 108777341B CN 201810533044 A CN201810533044 A CN 201810533044A CN 108777341 B CN108777341 B CN 108777341B
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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
- H01P1/207—Hollow waveguide filters
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Abstract
The invention relates to a tunable filter comprising: a first dielectric substrate; the second dielectric substrate and the first dielectric substrate are arranged at intervals, and the third plate surface is opposite to the second plate surface; the first conducting layer is arranged on the second plate surface or the third plate surface; the second conducting layer is arranged on the fourth board surface; the conductive perturbation column penetrates through the second dielectric substrate and is electrically connected with the first conductive layer and the second conductive layer; the centers of all metal through holes of the metal through hole array are on the same straight line, and all the metal through holes of the metal through hole array penetrate through the first dielectric substrate, the second dielectric substrate, the first conducting layer and the second conducting layer and are communicated with the first conducting layer and the second conducting layer; the first adjusting device is arranged in the range surrounded by the first conducting layer, the structure of the invention is simple, the design and production cost is effectively reduced, the bandwidth is adjustable, and the bandwidth is widened.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an adjustable filter.
Background
In recent years, with the rapid development of the communication industry, broadband communication systems have been widely used, wherein the bandwidth selectivity and the utilization rate of frequency resources of the broadband communication systems have become more and more important. Therefore, how to solve the problems of bandwidth selectivity and frequency resource utilization of the broadband communication system has also attracted attention of researchers.
The filter is an important component in the broadband communication system, and improving the performance of the filter plays a great role in improving the performance of the broadband communication system. In recent years, with the continuous improvement of design ideas, filters of the type such as dual-mode resonance, step impedance resonance, and the like have appeared.
However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the conventional type of filter is very costly in design and manufacturing due to its complex structure.
Disclosure of Invention
In view of the above, it is necessary to provide a tunable filter for solving the problem that the conventional filter has a complicated structure and thus the design and manufacturing costs are very high.
In order to achieve the above object, an embodiment of the present invention provides a tunable filter, including:
the first dielectric substrate comprises a first plate surface and a second plate surface opposite to the first plate surface;
the second dielectric substrate comprises a third plate surface and a fourth plate surface opposite to the third plate surface, the second dielectric substrate and the first dielectric substrate are arranged at intervals, and the third plate surface is opposite to the second plate surface;
the first conducting layer is arranged on the second plate surface or the third plate surface;
the second conducting layer is arranged on the fourth board surface;
the conductive perturbation column penetrates through the second dielectric substrate and is electrically connected with the first conductive layer and the second conductive layer;
the centers of all metal through holes of the metal through hole array are on the same straight line, and all the metal through holes of the metal through hole array penetrate through the second dielectric substrate, the first conducting layer and the second conducting layer and are communicated with the first conducting layer and the second conducting layer; and
and the first adjusting device is used for adjusting the resonant frequency of a resonant cavity formed by the first conducting layer, the second dielectric substrate and the second conducting layer.
In one embodiment, the first adjusting means comprises:
the first tuning metal via hole penetrates through the first dielectric substrate and is electrically connected with the first conductive layer;
the first tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer and is not in contact with the first conducting layer;
when the resonant frequency of the resonant cavity is adjusted, the first tuning metal via hole is conducted with the first tuning post.
In one embodiment, the first adjusting means further comprises:
the first mounting pad is arranged on the first plate surface and is electrically connected with the first tuning metal through hole;
the second mounting pad is arranged on the first plate surface and is electrically connected with the first tuning post;
and one end of the first switch is electrically connected with the first mounting pad, and the other end of the first switch is electrically connected with the second mounting pad.
In one embodiment, the first switch is an RF MEMS switch.
In one embodiment, the resonant circuit further comprises a second adjusting device, and the second adjusting device is used for adjusting the resonant frequency of a resonant cavity surrounded by the first conducting layer, the second dielectric substrate and the second conducting layer.
In one embodiment, the second adjusting means comprises:
the second tuning metal through hole penetrates through the first dielectric substrate and is electrically connected with the first conductive layer;
the second tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer and is not contacted with the first conducting layer;
and when the resonant frequency of the resonant cavity is adjusted, the second tuning metal via hole is conducted with the second tuning post.
In one embodiment, the second adjusting means further comprises:
the third mounting pad is arranged on the first plate surface and is electrically connected with the second tuning metal through hole;
the fourth mounting pad is arranged on the first plate surface and is electrically connected with the second tuning post;
and one end of the second switch is electrically connected with the third mounting pad, and the other end of the second switch is electrically connected with the fourth mounting pad.
In one embodiment, the second switch is an RF MEMS switch.
In one embodiment, the first conductive layer comprises trapezoidal conductive elements, first rectangular conductive elements, second rectangular conductive elements, hexagonal conductive elements, and equilateral right-angled triangle conductive elements;
the trapezoidal conductive unit is connected with the first rectangular conductive unit, the second rectangular conductive unit, the hexagonal conductive unit and the equilateral right-angled triangle conductive unit; the first rectangular conductive unit and the second rectangular conductive unit are not in contact with the hexagonal conductive unit.
One of the above technical solutions has the following advantages and beneficial effects:
the tunable filter provided by the embodiments of the invention has a simple structure, effectively reduces the design and production cost, realizes bandwidth adjustability and widens the bandwidth.
Drawings
FIG. 1 is a schematic diagram of a first structure of a tunable filter according to the present invention;
FIG. 2 is a top view of a tunable filter according to the present invention in one embodiment;
FIG. 3 is a schematic diagram of a first conductive layer of a tunable filter according to an embodiment of the present invention;
FIG. 4 is a graph of the response of a metal via array to bandwidth of a tunable filter according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of a first configuration of an adjusting device of the tunable filter of the present invention in one embodiment;
fig. 6 is a schematic diagram of a second configuration of an adjusting device of the tunable filter of the present invention in one embodiment;
FIG. 7 is a diagram illustrating a second configuration of a tunable filter according to the present invention;
figure 8 is a graph of the response of the tuning device of the tunable filter of the present invention to the resonant frequency in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve the problem that the conventional filter has a complicated structure and thus has a high design cost and a high manufacturing cost, as shown in fig. 1 and 2, the present invention provides a tunable filter comprising:
the first dielectric substrate 11, the first dielectric substrate 11 includes the first face and second face opposite to first face;
a second dielectric substrate 12, wherein the second dielectric substrate 12 includes a third plate surface and a fourth plate surface opposite to the third plate surface, the second dielectric substrate 12 and the first dielectric substrate 11 are arranged at an interval, and the third plate surface is opposite to the second plate surface;
the first conducting layer 13, the first conducting layer 13 is set up on the second plate surface or third plate surface;
a second conductive layer 14, the second conductive layer 14 being provided on the fourth plate surface;
the conductive perturbation column 15 penetrates through the second dielectric substrate 12 and is electrically connected with the first conductive layer 13 and the second conductive layer 14;
as shown in fig. 2, in the metal via array 21, centers of the metal vias of the metal via array 21 are on the same straight line, and each metal via of the metal via array 21 penetrates through the second dielectric substrate, the first conductive layer and the second conductive layer and connects the first conductive layer and the second conductive layer; and
and the first adjusting device 16, wherein the first adjusting device 16 is used for adjusting the resonant frequency of a resonant cavity surrounded by the first conducting layer 13, the second dielectric substrate 12 and the second conducting layer 14.
Wherein the first dielectric substrate is used for mounting the adjusting device. Specifically, the invention focuses on providing a filter design concept with simple structure, wide bandwidth and adjustability, and the shape, size and material of the first dielectric substrate and the second dielectric substrate can be determined according to the actual application requirements, and the performance of the filter can be optimized through analog simulation debugging.
The first conducting layer is clamped between the first dielectric substrate and the second dielectric substrate, and the second conducting layer is arranged on the third plate surface of the second dielectric substrate. The first conductive layer is a quarter-mode conductive layer, and the specific shape and size of the first conductive layer can be determined according to the practical application. As shown in fig. 3, in one embodiment, first conductive layer 13 includes trapezoidal conductive elements 131, first rectangular conductive elements 132, second rectangular conductive elements 133, hexagonal conductive elements 134, and equilateral right triangle conductive elements 135;
the trapezoid conductive unit 131 is connected to the first rectangular conductive unit 132, the second rectangular conductive unit 133, the hexagonal conductive unit 134, and the equilateral right-angled triangle conductive unit 135; the first rectangular conductive unit 132 and the second rectangular conductive unit 133 are not in contact with the hexagonal conductive unit 134.
The metal via hole array comprises a plurality of metal via holes, wherein the metal via holes are formed by plating a layer of thin copper on the inner wall of each hole through chemical reaction on the hole wall between the top layer and the bottom layer, so that the top layer and the bottom layer of the printed circuit board are connected with each other, and the specific number and the arrangement positions of the top layer and the bottom layer need to be determined according to the numberDepending on the requirements of the application. The first conducting layer, the second conducting layer and the second dielectric substrate enclose a resonant cavity of the tunable filter of the present invention, and a typical TM exists in a quarter mode01/TM10、TM02/TM20And TM12/TM21In the mode of iso-mode, a conductive perturbation column is introduced to a proper position of the resonant cavity, and the metal via hole array generates perturbation to adjust TM01/TM10、TM02/TM20And TM12/TM21Thereby adjusting TM01/TM10、TM02/TM20And TM12/TM21Thereby broadening the bandwidth of the filter. As shown in fig. 4, the bandwidth of the filter is widened by nearly 50% after the introduction of the metal via array.
The conductive perturbation column is used for adjusting the resonant frequency of the resonant cavity of the tunable filter, which is surrounded by the first conductive layer, the second conductive layer and the second dielectric substrate, and further, the bandwidth is widened.
And an adjusting device is introduced at a proper position and can adjust the resonant frequency of the adjustable filter, so that the adjustable bandwidth of the adjustable filter is adjustable. The adjusting device is an electrically tunable device, for example, a capacitor is loaded on the resonant cavity to adjust the resonant frequency of the tunable filter of the present invention. The embodiment only exemplifies that the capacitor is used for adjusting the resonant frequency, and other electric adjusting devices which can be used for adjusting the resonant frequency in the field can be applied to the invention, which is not listed here.
In each embodiment of the tunable filter, the first conductive layer is sandwiched between the first dielectric substrate and the second dielectric substrate, the second conductive layer is disposed on the fourth plate surface of the second dielectric substrate, the conductive perturbation column is disposed in the resonant cavity defined by the first conductive layer, the second conductive layer and the second dielectric substrate, that is, the conductive perturbation column penetrates through the second dielectric substrate and is electrically connected with the first conductive layer and the second conductive layer, each metal via hole in the metal via hole array penetrates through the first dielectric substrate, the second dielectric substrate, the first conductive layer and the second conductive layer, and a first adjusting device for adjusting the resonant frequency of the resonant cavity defined by the first conductive layer, the second dielectric substrate and the second conductive layer is further disposed, the tunable filter provided in each embodiment of the invention has a simple structure, effectively reduces the design and manufacturing costs, and realizes bandwidth adjustability, and broadens the bandwidth.
In one embodiment, as shown in FIG. 5, the first adjuster 16 includes:
a first tuning metal via 161, the first tuning metal via 161 penetrating the first dielectric substrate 11 and electrically connected to the first conductive layer;
the first tuning post 162 penetrates through the first dielectric substrate 11, the first conductive layer 13, the second dielectric substrate 12 and the second conductive layer 14 to be electrically connected, and is not in contact with the first conductive layer 13;
when the resonant frequency of the resonant cavity is adjusted, the first tuning metal via 161 and the first tuning post 162 are conducted.
Specifically, in this embodiment, the tuning device is implemented by a first tuning metal via and a first tuning post, wherein the first tuning metal via is electrically connected to the first conductive layer through the first dielectric substrate. The first tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate to be electrically connected with the second conducting layer, and the first tuning post is not in contact with the first conducting layer, namely is not conductive.
It should be noted that, an aperture is formed in the first conductive layer, the first tuning post passes through the aperture and is not in contact with the aperture, and the size of the aperture is small and does not affect the distribution of the electric field in the resonant cavity. When the first tuning metal via hole is not conducted with the first tuning column, the resonance characteristic of the resonant cavity is basically unchanged; when the first tuning metal via hole is conducted with the first tuning post, the electric field inside the resonant cavity is disturbed, and therefore the resonant frequency of the resonant cavity is changed. Therefore, the frequency characteristics of the resonant cavity of the tunable filter can be adjusted by controlling the disconnection and the connection of the first tuning metal via hole and the first tuning post, and the bandwidth can be adjusted.
In each embodiment of the tunable filter, the function of the adjusting device is realized in the form of the first tuning metal via hole and the first tuning post, the introduction of the adjusting device does not change the frequency characteristic of the resonant cavity, but the frequency characteristic of the resonant cavity is adjusted by changing the connection state of the first tuning metal via hole and the first tuning post, the adjusting device has a simple structure and is easy to realize, and the implantation of the adjusting device does not influence the frequency characteristic of the tunable filter.
Based on the above embodiment, as shown in fig. 6, the first regulator 16 further includes:
a first mounting pad 163, the first mounting pad 163 disposed on the first panel and electrically connected to the first tuning metal via 161;
a second mounting pad 164, the second mounting pad 164 disposed on the first panel and electrically connected to the first tuning post 162;
a first switch 165, the first switch 165 having one end electrically connected to the first mounting pad 163 and the other end electrically connected to the second mounting pad 164.
Further, the first switch 165 is an RF MEMS switch.
Specifically, the first and second mounting pads are made of an electrically conductive material, the first mounting pad is electrically connected to the first tuning metal via, and the second mounting pad is electrically connected to the first tuning post.
One end of the first switch is electrically connected with the first tuning metal through hole through the first mounting pad, and the other end of the first switch is electrically connected with the first tuning post through the second mounting pad. The first switch is used for controlling the conduction and the disconnection of the first tuning metal via hole and the first tuning post. Further, in one embodiment, the first switch is an RF MEMS switch, which has the characteristics of high efficiency, fast response, accuracy, high frequency of repeated use, and the like, so that the tunable filter of the present invention is efficient and accurate in adjusting the resonant frequency.
In each embodiment of the tunable filter, the connection state of the first tuning metal via hole and the first tuning post is controlled by installing the first switch, so that the resonant frequency of the tunable filter is adjusted more conveniently and more quickly.
Based on the above embodiment, as shown in fig. 7, a second adjusting device 17 is further included, and the second adjusting device 17 is used for adjusting the resonant frequency of the resonant cavity surrounded by the first conductive layer 13, the second dielectric substrate 12 and the second conductive layer 14.
Further, the second adjusting device includes:
the second tuning metal through hole penetrates through the first dielectric substrate and is electrically connected with the first conducting layer;
the second tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer and is not contacted with the first conducting layer;
and when the resonant frequency of the resonant cavity is adjusted, the second tuning metal via hole is conducted with the second tuning post.
Further, the second adjusting device further includes:
the third mounting pad is arranged on the first plate surface and is electrically connected with the second tuning metal through hole;
the fourth mounting pad is arranged on the first plate surface and is electrically connected with the second tuning post;
and one end of the second switch is electrically connected with the third mounting pad, and the other end of the second switch is electrically connected with the fourth mounting pad.
Further, the second switch is an RF MEMS switch.
Specifically, the structure of the second adjusting device in this embodiment is the same as the structure of the first adjusting device in the above embodiment, and details of the structure of the second adjusting device are not repeated in this embodiment.
In each embodiment of the adjustable filter, a second adjusting device is introduced and used together with the first adjusting device, so that the adjustable filter can be switched among three states. The first state: neither the first nor the second regulating device is conductive; in the second state, the first adjusting device and the second adjusting device are only conducted one; and a third state: the first and second regulating devices are both conducting.
In one embodiment, the tunable filter of the present invention comprises:
the first dielectric substrate comprises a first plate surface and a second plate surface opposite to the first plate surface;
the second dielectric substrate comprises a third plate surface and a fourth plate surface opposite to the third plate surface, the second dielectric substrate and the first dielectric substrate are arranged at intervals, and the third plate surface is opposite to the second plate surface;
the first conducting layer is arranged on the second plate surface or the third plate surface; the first conducting layer comprises a trapezoid conducting unit, a first rectangular conducting unit, a second rectangular conducting unit, a hexagonal conducting unit and an equilateral right-angled triangle conducting unit; the trapezoidal conductive unit is connected with the first rectangular conductive unit, the second rectangular conductive unit, the hexagonal conductive unit and the equilateral right-angled triangle conductive unit; the first rectangular conductive unit and the second rectangular conductive unit are not in contact with the hexagonal conductive unit;
the second conducting layer is arranged on the fourth board surface;
the conductive perturbation column penetrates through the second dielectric substrate and is electrically connected with the first conductive layer and the second conductive layer;
the centers of all metal through holes of the metal through hole array are on the same straight line, and all the metal through holes of the metal through hole array penetrate through the first dielectric substrate, the second dielectric substrate, the first conducting layer and the second conducting layer and are communicated with the first conducting layer and the second conducting layer;
first adjusting means disposed adjacent to the first right-angled side and the right-angled vertex of the equilateral right-angled triangle conductive elements, the first adjusting means comprising: the first tuning metal through hole penetrates through the first dielectric substrate and is electrically connected with the first conducting layer; the first tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate to be electrically connected with the second conducting layer and is not in contact with the first conducting layer; further comprising: the first mounting pad is arranged on the first plate surface and is electrically connected with the first tuning metal through hole; the second mounting pad is arranged on the first plate surface and is electrically connected with the first tuning post; a first RF MEMS switch having one end electrically connected to the first mounting pad and the other end electrically connected to the second mounting pad; and
the second adjusting device is arranged near the second right-angle side and the right-angle vertex of the conductive unit of the equilateral right-angle triangle, and the second adjusting device comprises: the second tuning metal through hole penetrates through the first dielectric substrate and is electrically connected with the first conducting layer; the second tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer and is not in contact with the first conducting layer; further comprising: the third mounting pad is arranged on the first plate surface and is electrically connected with the second tuning metal through hole; the fourth mounting pad is arranged on the first plate surface and is electrically connected with the second tuning post; and a second RF MEMS switch having one end electrically connected to the third mounting pad and the other end electrically connected to the fourth mounting pad.
It should be explained that the core of the present invention is to provide a design concept that extends the bandwidth and realizes the bandwidth adjustability, and the size and material of the tunable filter of the present invention can be determined according to the requirements of the implementation application. As shown in fig. 8, through performance simulation tests, it is found that the center of the wideband filter is adjustable, the insertion loss variation is small, and the excellent performance of the filter is embodied.
In each embodiment of the adjustable filter, the bandwidth of the filter is widened, and three-level adjustment of the bandwidth is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A tunable filter, comprising:
the first dielectric substrate comprises a first plate surface and a second plate surface opposite to the first plate surface;
the second dielectric substrate comprises a third plate surface and a fourth plate surface opposite to the third plate surface, the second dielectric substrate and the first dielectric substrate are arranged at intervals, and the third plate surface is opposite to the second plate surface;
the first conducting layer is arranged on the second board surface or the third board surface;
the second conducting layer is arranged on the fourth board surface;
the conductive perturbation column penetrates through the second medium substrate and is electrically connected with the first conductive layer and the second conductive layer;
the centers of all metal through holes of the metal through hole array are on the same straight line, and all the metal through holes of the metal through hole array penetrate through the second dielectric substrate, the first conducting layer and the second conducting layer and conduct the first conducting layer and the second conducting layer; and
the first adjusting device is used for adjusting the resonant frequency of a resonant cavity surrounded by the first conducting layer, the second dielectric substrate and the second conducting layer;
wherein the first adjusting means comprises:
a first tuning metal via penetrating the first dielectric substrate and electrically connected to the first conductive layer;
the first tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer, and is not in contact with the first conducting layer;
when the resonant frequency of the resonant cavity is adjusted, the first tuning metal via hole is conducted with the first tuning post;
the first conducting layer comprises a trapezoid conducting unit, a first rectangular conducting unit, a second rectangular conducting unit, a hexagonal conducting unit and an equilateral right-angled triangle conducting unit;
the trapezoidal conductive unit is connected with the first rectangular conductive unit, the second rectangular conductive unit, the hexagonal conductive unit and the equilateral right-angled triangle conductive unit; the first rectangular conductive unit and the second rectangular conductive unit are not in contact with the hexagonal conductive unit;
the first adjusting device is arranged close to the first right-angle side and the right-angle vertex of the equilateral right-angle triangle conductive unit.
2. The tunable filter of claim 1, wherein the first adjusting means further comprises:
a first mounting pad disposed on the first panel and electrically connected to the first tuning metal via;
a second mounting pad disposed on the first panel and electrically connected to the first tuning post;
a first switch having one end electrically connected to the first mounting pad and the other end electrically connected to the second mounting pad.
3. The tunable filter of claim 2, wherein the first switch is an RF MEMS switch.
4. A tunable filter according to any one of claims 1 to 3, further comprising a second adjusting device for adjusting a resonant frequency of a resonant cavity surrounded by the first conductive layer, the second dielectric substrate and the second conductive layer.
5. The tunable filter of claim 4, wherein the second tuning device is disposed proximate to the second leg and the right angle vertex of the equilateral right triangle conductive elements.
6. The tunable filter of claim 5, wherein the second adjusting means comprises:
a second tuning metal via penetrating the first dielectric substrate and electrically connected to the first conductive layer;
the second tuning post penetrates through the first dielectric substrate, the first conducting layer and the second dielectric substrate, is electrically connected with the second conducting layer and is not in contact with the first conducting layer;
and when the resonant frequency of the resonant cavity is adjusted, the second tuning metal via hole is conducted with the second tuning post.
7. The tunable filter of claim 6, wherein the second adjusting means further comprises:
a third mounting pad disposed on the first panel and electrically connected to the second tuning metal via;
a fourth mounting pad disposed on the first panel and electrically connected to the second tuning post;
a second switch having one end electrically connected to the third mounting pad and another end electrically connected to the fourth mounting pad.
8. The tunable filter of claim 7, wherein the second switch is an RF MEMS switch.
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| CN201810533044.9A CN108777341B (en) | 2018-05-29 | 2018-05-29 | Tunable filter |
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| CN104241738B (en) * | 2014-09-16 | 2017-06-20 | 电子科技大学 | A kind of substrate integration wave-guide tunable filter of loading PIN pipes |
| CN106252800B (en) * | 2016-07-18 | 2019-03-12 | 中国科学院微电子研究所 | Substrate integrated waveguide filter with adjustable center frequency and manufacturing method thereof |
| CN107799856B (en) * | 2017-10-19 | 2020-01-24 | 广东曼克维通信科技有限公司 | Substrate integrated waveguide tunable filter |
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Non-Patent Citations (2)
| Title |
|---|
| A 1.2–1.6-GHz Substrate-Integrated-Waveguide RF MEMS Tunable Filter;Vikram Sekar et al.;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20110430;第59卷(第4期);第II、III部分，图1、7 * |
| An Improved Compact Substrate Integrated Waveguide (SIW) Bandpass Filter with Sharp Rejection and Wide Upper-Stopband;Fei Deng et al.;《2015 Asia-Pacific Microwave Conference(APMC)》;20151209;第II部分，图1 * |
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