CN110233317B - Microwave band-pass filter and communication equipment - Google Patents
Microwave band-pass filter and communication equipment Download PDFInfo
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- CN110233317B CN110233317B CN201910598031.4A CN201910598031A CN110233317B CN 110233317 B CN110233317 B CN 110233317B CN 201910598031 A CN201910598031 A CN 201910598031A CN 110233317 B CN110233317 B CN 110233317B
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- 238000004891 communication Methods 0.000 title claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 69
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 16
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 16
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 15
- 239000012153 distilled water Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000001629 suppression Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 12
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a microwave band-pass filter and communication equipment, wherein the filter comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially arranged from top to bottom, the back surface of the first dielectric plate is covered with a first metal layer, the front surface of the third dielectric plate is covered with a second metal layer, the back surface of the first dielectric plate is connected with the front surface of the third dielectric plate through a plurality of metal columns, and the metal columns penetrate through the second dielectric plate; the front surface of the second dielectric plate is provided with a first input/output port, a second input/output port and a three-mode resonator, and a polytetrafluoroethylene tube is inserted into a gap between the three-mode resonator and the back surface of the first dielectric plate. The invention has three transmission poles and two transmission zeros, improves the channel selectivity and out-of-band suppression degree of the filter, has the advantages of simple design and good performance, particularly can keep very low insertion loss in the frequency tuning process, and can well meet the requirements of modern communication systems.
Description
Technical Field
The invention relates to a filter, in particular to a microwave band-pass filter and communication equipment, and belongs to the technical field of communication.
Background
The microwave filter is an indispensable device for a transmitting end and a receiving end in a modern communication system, and has a separation function on signals, so that useful signals pass through without attenuation as much as possible, and useless signals are restrained from passing through by attenuation as much as possible. With the development of wireless communication technology and the increase of frequency range, a large number of microwave band-pass filters using fixed frequencies are required to cover a wider frequency range. In order to reduce the number of fixed frequency microwave bandpass filters and the size of the rf front-end, tunable bandpass filters are a good choice.
The tunable bandpass filters are mainly classified into mechanical tuning, magnetic tuning and electrical tuning. The variable capacitance diode, the PIN diode and the MEMS tuning filter belong to electric tuning, and the adjustable filter has smaller size, faster tuning speed and convenient tuning, so the adjustable filter has wider application. I.C. Hunter and John David Rhodes in 1982 describe a varactor loaded comb-line tunable filter. Meanwhile, the absolute bandwidth is not changed when the electric length of the comb line tunable filter is 52.884 degrees, so that a guiding basis is provided for the application of the subsequent comb line tunable filter. In 2010, wu Guochun designed a harmonic suppression electrically tunable filter based on a microstrip split ring structure. The teaching of Chinese scholars Zhang Xiuyin in 2010 proposes a constant absolute bandwidth design method based on a hybrid electromagnetic coupling structure. Because the coupling region is positioned in the middle of the quarter-wavelength resonator, the strength of the electric coupling is equivalent to that of the magnetic coupling, and therefore, the inter-cavity coupling is electromagnetic hybrid coupling. When a proper coupling area is selected, constant absolute bandwidth can be realized in the whole frequency tuning range, the frequency tuning range obtained by testing is 0.68-1.00GHz, and the absolute bandwidth of 1-dB is 80+/-3.5 MHz.
Disclosure of Invention
In view of the above, the present invention aims to provide a microwave band-pass filter, which has three transmission poles and two transmission zeros, improves the channel selectivity and the out-of-band suppression degree of the filter, has the advantages of simple design and good performance, and particularly can keep very low insertion loss in the frequency tuning process, and can well meet the requirements of modern communication systems.
It is a further object of the present invention to provide a communication device.
The aim of the invention can be achieved by adopting the following technical scheme:
the microwave band-pass filter comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially arranged from top to bottom, wherein the back surface of the first dielectric plate is covered with a first metal layer, the front surface of the third dielectric plate is covered with a second metal layer, the back surface of the first dielectric plate is connected with the front surface of the third dielectric plate through a plurality of metal columns, and the metal columns penetrate through the second dielectric plate;
the front surface of the second dielectric plate is provided with a first input/output port, a second input/output port and a three-mode resonator, and a polytetrafluoroethylene tube is inserted into a gap between the three-mode resonator and the back surface of the first dielectric plate.
Further, the three-mode resonator comprises a half-wavelength open-circuit resonator, wherein the half-wavelength open-circuit resonator is loaded with two open-circuit branches, and the two open-circuit branches are respectively connected with the first input/output port and the second input/output port.
Further, four polytetrafluoroethylene tubes are inserted between the half-wavelength open-circuit resonator and the gap between the back of the first dielectric plate, and one polytetrafluoroethylene tube is inserted between each open-circuit branch and the gap between the back of the first dielectric plate.
Furthermore, the two open-circuit branches are in mirror symmetry and are loaded on two opposite sides of the half-wavelength open-circuit resonator.
Further, the half-wavelength open-circuit resonator is of a rectangular structure, and each open-circuit branch is of a bent structure.
Further, the bent structure comprises a horizontal section and a vertical section which are connected.
Further, a plurality of through holes are formed in the second dielectric plate, the through holes correspond to the metal columns one by one, and each through hole can enable the corresponding metal column to pass through.
Further, one end of the plurality of metal posts is arranged around the back surface of the first dielectric plate, and the other end of the plurality of metal posts is arranged around the front surface of the third dielectric plate.
Further, the first input/output port and the second input/output port are respectively welded with an SMA head for feeding, and the outer conductors of the SMA heads are respectively connected with the first metal layer and the second metal layer.
The other object of the invention can be achieved by adopting the following technical scheme:
a communication device comprises the microwave band-pass filter.
Compared with the prior art, the invention has the following beneficial effects:
1. the filter provided by the invention is provided with three dielectric plates which are sequentially arranged from top to bottom, wherein the back surface of the upper dielectric plate is connected with the front surface of the lower dielectric plate through a plurality of metal columns, the metal columns penetrate through the middle dielectric plate, so that the middle dielectric plate is suspended, the radiation loss of the filter is reduced by using the metal columns, the front surface of the middle dielectric plate is provided with a three-mode resonator, a polytetrafluoroethylene tube can be inserted into a gap between the three-mode resonator and the back surface of the upper dielectric plate, and the equivalent dielectric constants above the microstrip line arranged on the middle dielectric plate are different, so that the change of three modes is controlled by using the amount of distilled water, thereby achieving the effect of frequency tuning.
2. The filter provided by the invention has three transmission poles, so that the out-of-band suppression degree of the filter is improved, two transmission zeros exist at two sides of the passband of the filter, and the channel selectivity of the filter is improved.
Drawings
Fig. 1 is a schematic perspective view of a microwave band-pass filter according to embodiment 1 of the present invention.
Fig. 2 is a schematic front view of a microwave band-pass filter according to embodiment 1 of the present invention.
Fig. 3 is a schematic side view of a microwave band-pass filter according to embodiment 1 of the present invention.
Fig. 4 is a schematic front view of a first dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 5 is a schematic back view of a first dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 6 is a schematic front view of a third dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 7 is a schematic back view of a third dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 8 is a schematic front view of a second dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 9 is a schematic back view of a second dielectric plate in the microwave band-pass filter of embodiment 1 of the present invention.
Fig. 10 is a graph showing electromagnetic simulation results of the microwave band-pass filter of embodiment 1 of the present invention.
The device comprises a 1-first dielectric plate, a 2-second dielectric plate, a 3-third dielectric plate, a 4-first metal layer, a 5-second metal layer, a 6-metal column, a 7-first input/output port, an 8-second input/output port, a 9-three-mode resonator, a 901-half-wavelength open-circuit resonator, a 902-first open-circuit branch, a 903-second open-circuit branch, a 10-polytetrafluoroethylene tube and an 11-through hole.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1 to 3, the present embodiment provides a microwave band-pass filter including a first dielectric plate 1, a second dielectric plate 2, and a third dielectric plate 3, which are disposed in this order from top to bottom.
As shown in fig. 1 to 7, the first dielectric plate 1 and the third dielectric plate 3 are both single-layer plates, the back surface of the first dielectric plate 1 is covered with a first metal layer 4, the front surface of the third dielectric plate 3 is covered with a second metal layer 5, the back surface of the first dielectric plate 1 is connected with the front surface of the third dielectric plate 3 through twelve metal posts 6, and the twelve metal posts 6 penetrate through the second dielectric plate 2, so that the second dielectric plate 2 is suspended.
Further, one end of twelve metal posts 6 is arranged around the back surface of the first dielectric plate 1, and the other end is arranged around the front surface of the third dielectric plate 3; one end of each of the four metal posts 6 is arranged at four corners of the back surface of the first dielectric plate 1, and the other end of each of the four metal posts is arranged at four corners of the front surface of the third dielectric plate 3; one end of each of the two metal posts 6 is arranged at the upper edge of the back surface of the first dielectric plate 1 and is positioned between the left upper corner and the right upper corner of the back surface of the first dielectric plate 1, and the other end of each of the two metal posts is arranged at the upper edge of the front surface of the third dielectric plate 3 and is positioned between the left upper corner and the right upper corner of the front surface of the third dielectric plate 3; one end of each of the two metal posts 6 is arranged at the lower edge of the back surface of the first dielectric plate 1 and is positioned between the left lower corner and the right lower corner of the back surface of the first dielectric plate 1, and the other end of each of the two metal posts is arranged at the lower edge of the front surface of the third dielectric plate 3 and is positioned between the left lower corner and the right lower corner of the front surface of the third dielectric plate 3; one end of each of the two metal posts 6 is arranged at the left edge of the back surface of the first dielectric plate 1 and is positioned between the left upper corner and the left lower corner of the back surface of the first dielectric plate 1, and the other end of each of the two metal posts is arranged at the left edge of the front surface of the third dielectric plate 3 and is positioned between the left upper corner and the left lower corner of the front surface of the third dielectric plate 3; one end of each of the two metal posts 6 is arranged at the right edge of the back surface of the first dielectric plate 1 and is positioned between the upper right corner and the lower right corner of the back surface of the first dielectric plate 1, and the other end of each of the two metal posts is arranged at the right edge of the front surface of the third dielectric plate 3 and is positioned between the upper right corner and the lower right corner of the front surface of the third dielectric plate 3; the positions of the twelve metal posts 6 are arranged in the mode, so that the connection between the first dielectric plate 1 and the third dielectric plate 3 is firmer, and the radiation loss of the filter is reduced due to the use of the metal posts 6.
Those skilled in the art will appreciate that the positioning of the twelve metal posts 6 may also be: one end of each of the four metal posts 6 is arranged at four corners of the back surface of the first dielectric plate 1, and the other end of each of the four metal posts is arranged at four corners of the front surface of the third dielectric plate 3; one end of a metal column 6 is arranged at the upper edge of the back surface of the first dielectric plate 1 and is positioned between the left upper corner and the right upper corner of the back surface of the first dielectric plate 1, and the other end of the metal column is arranged at the upper edge of the front surface of the third dielectric plate 3 and is positioned between the left upper corner and the right upper corner of the front surface of the third dielectric plate 3; one end of a metal column 6 is arranged at the lower edge of the back surface of the first dielectric plate 1 and is positioned between the left lower corner and the right lower corner of the back surface of the first dielectric plate 1, and the other end of the metal column is arranged at the lower edge of the front surface of the third dielectric plate 3 and is positioned between the left lower corner and the right lower corner of the front surface of the third dielectric plate 3; one end of each of the three metal posts 6 is arranged at the left edge of the back surface of the first dielectric plate 1 and is positioned between the left upper corner and the left lower corner of the back surface of the first dielectric plate 1, and the other end of each of the three metal posts is arranged at the left edge of the front surface of the third dielectric plate 3 and is positioned between the left upper corner and the left lower corner of the front surface of the third dielectric plate 3; one end of each of the three metal posts 6 is arranged at the right edge of the back surface of the first dielectric plate 1 and is positioned between the upper right corner and the lower right corner of the back surface of the first dielectric plate 1, and the other end of each of the three metal posts is arranged at the right edge of the front surface of the third dielectric plate 3 and is positioned between the upper right corner and the lower right corner of the front surface of the third dielectric plate 3.
As shown in fig. 1 to 3 and 8 to 9, the front surface of the second dielectric plate 2 is provided with a first input/output port 7, a second input/output port 8 and a three-mode resonator 9, and a polytetrafluoroethylene tube 10 is inserted into a gap between the three-mode resonator 9 and the back surface of the first dielectric plate 1, and the first input/output port 7, the second input/output port 8 and the three-mode resonator 9 are microstrip lines, and the polytetrafluoroethylene tube 10 is used for filling distilled water.
Further, the three-mode resonator 9 includes a half-wavelength open-circuit resonator 901, the half-wavelength open-circuit resonator 901 is loaded with a first open-circuit branch 902 and a second open-circuit branch 903, the first open-circuit branch 902 and the second open-circuit branch 903 are mirror symmetrical, and are loaded on both sides of the half-wavelength open-circuit resonator 901, since the width of the half-wavelength open-circuit resonator 901 is wider and the length is longer, four polytetrafluoroethylene tubes 10 are inserted between the gaps between the half-wavelength open-circuit resonator 901 and the back surface of the first dielectric plate 1, the width of the first open-circuit branch 902 and the length of the second open-circuit branch 903 are narrower, therefore, one polytetrafluoroethylene tube 10 is inserted between the gaps between the first open-circuit branch 902 and the back surface of the first dielectric plate 1, each polytetrafluoroethylene tube 10 can be filled with distilled water, since the amount of distilled water placed over the line of the second dielectric plate 2 is different, the distilled water is different, the loss is controlled by using the different amounts of equivalent distilled water, and the advantages of the distilled water can be achieved, and the three-phase filter has small loss can be achieved, and the advantages of the distilled water can be achieved; the first input/output port 7 and the second input/output port 8 are respectively welded with an SMA head for feeding, and the outer conductors of the SMA head are respectively connected with the first metal layer 4 and the second metal layer 5.
Preferably, the half-wavelength open-circuit resonator 901 is in a rectangular structure, the distance between the upper side of the half-wavelength open-circuit resonator 901 and the upper edge of the front face of the second dielectric plate 2 is relatively close, the distance between the lower side of the half-wavelength open-circuit resonator 901 and the lower edge of the front face of the second dielectric plate 2 is relatively close, the first open-circuit branch 902 and the second open-circuit branch 903 are both in a bent structure, and the bent structure comprises a horizontal section and a vertical section which are connected, wherein the vertical section extends towards the upper edge of the front face of the second dielectric plate 2.
In order to make twelve metal posts 6 pass through the second dielectric plate 2, twelve through holes 11 are formed in the second dielectric plate 2, the through holes 11 are in one-to-one correspondence with the metal posts 6, and each through hole 11 can make the corresponding metal post 6 pass through.
The first metal layer 4, the second metal layer 5, the metal posts 6, the first input/output ports 7, the second input/output ports 8, and the three-mode resonator 9 in this embodiment may be any one of aluminum, iron, tin, copper, silver, gold, and platinum, or may be an alloy of any one of aluminum, iron, tin, copper, silver, gold, and platinum, and a copper material is preferably used.
The electromagnetic simulation result graph of the microwave band-pass filter of the embodiment is shown in FIG. 10, in which |S 21 The i represents the forward transmission coefficient from the first input/output port 7 to the second input/output port 8, and it can be seen that the filter has three transmission poles, improving the out-of-band rejection degree of the filter, and two transmission zeros exist on two sides of the passband of the filter, improving the channel selectivity of the filter.
Example 2:
the present embodiment provides a communication device, which may be a mobile phone, a tablet computer, or the like, and includes the microwave band-pass filter of embodiment 1.
In summary, the filter of the invention has three dielectric plates sequentially arranged from top to bottom, wherein the back surface of the upper dielectric plate is connected with the front surface of the lower dielectric plate through a plurality of metal columns, the metal columns penetrate through the middle dielectric plate, so that the middle dielectric plate is suspended, the radiation loss of the filter is reduced by using the metal columns, the front surface of the middle dielectric plate is provided with a three-mode resonator, a polytetrafluoroethylene tube can be inserted into a gap between the three-mode resonator and the back surface of the upper dielectric plate, and the equivalent dielectric constants above the microstrip line arranged on the middle dielectric plate are different due to different amounts of distilled water, so that the change of three modes is controlled by using the distilled water amount, thereby achieving the effect of frequency tuning.
The above-mentioned embodiments are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can make equivalent substitutions or modifications according to the technical solution and the inventive concept of the present invention within the scope of the present invention disclosed in the present invention patent, and all those skilled in the art belong to the protection scope of the present invention.
Claims (7)
1. A microwave bandpass filter, characterized by: the device comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially arranged from top to bottom, wherein the back surface of the first dielectric plate is covered with a first metal layer, the front surface of the third dielectric plate is covered with a second metal layer, the back surface of the first dielectric plate is connected with the front surface of the third dielectric plate through a plurality of metal columns, and the metal columns penetrate through the second dielectric plate;
the front surface of the second dielectric plate is provided with a first input/output port, a second input/output port and a three-mode resonator, a polytetrafluoroethylene tube is inserted into a gap between the three-mode resonator and the back surface of the first dielectric plate, the polytetrafluoroethylene tube is used for filling distilled water, and the change of three modes is controlled by using the amount of the distilled water;
the three-mode resonator comprises a half-wavelength open-circuit resonator, wherein the half-wavelength open-circuit resonator is loaded with two open-circuit branches, and the two open-circuit branches are respectively connected with a first input/output port and a second input/output port; four polytetrafluoroethylene tubes are inserted between the half-wavelength open-circuit resonator and the gap between the back of the first dielectric plate, and one polytetrafluoroethylene tube is inserted between each open-circuit branch and the gap between the back of the first dielectric plate; the two open-circuit branches are in mirror symmetry and are loaded on two opposite sides of the half-wavelength open-circuit resonator.
2. The microwave bandpass filter according to claim 1, wherein: the half-wavelength open-circuit resonator is of a rectangular structure, and each open-circuit branch is of a bent structure.
3. A microwave bandpass filter according to claim 2, characterized in that: the bent structure comprises a horizontal section and a vertical section which are connected.
4. A microwave bandpass filter according to any one of claims 1-3 wherein: the second dielectric plate is provided with a plurality of through holes, the through holes are in one-to-one correspondence with the metal columns, and each through hole can enable the corresponding metal column to pass through.
5. A microwave bandpass filter according to any one of claims 1-3 wherein: one end of each metal column is arranged around the back surface of the first dielectric plate, and the other end of each metal column is arranged around the front surface of the third dielectric plate.
6. A microwave bandpass filter according to any one of claims 1-3 wherein: and the first input/output port and the second input/output port are respectively welded with an SMA head for feeding, and the outer conductors of the SMA heads are respectively connected with the first metal layer and the second metal layer.
7. A communication device, characterized by: comprising a microwave bandpass filter according to any one of claims 1-6.
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| CN201910598031.4A CN110233317B (en) | 2019-07-04 | 2019-07-04 | Microwave band-pass filter and communication equipment |
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| CN110233317A CN110233317A (en) | 2019-09-13 |
| CN110233317B true CN110233317B (en) | 2024-03-29 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392629A (en) * | 2001-06-20 | 2003-01-22 | 株式会社村田制作所 | Dielectric filter, dielectric duplexer and communication device |
| CN106450610A (en) * | 2016-11-10 | 2017-02-22 | 电子科技大学 | A novel dual-passband filter |
| CN107134613A (en) * | 2017-04-25 | 2017-09-05 | 西安电子科技大学 | Three band band-pass filters of resonator are loaded based on open circuit minor matters |
| CN209929455U (en) * | 2019-07-04 | 2020-01-10 | 华南理工大学 | Microwave band-pass filter and communication equipment |
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2019
- 2019-07-04 CN CN201910598031.4A patent/CN110233317B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392629A (en) * | 2001-06-20 | 2003-01-22 | 株式会社村田制作所 | Dielectric filter, dielectric duplexer and communication device |
| CN106450610A (en) * | 2016-11-10 | 2017-02-22 | 电子科技大学 | A novel dual-passband filter |
| CN107134613A (en) * | 2017-04-25 | 2017-09-05 | 西安电子科技大学 | Three band band-pass filters of resonator are loaded based on open circuit minor matters |
| CN209929455U (en) * | 2019-07-04 | 2020-01-10 | 华南理工大学 | Microwave band-pass filter and communication equipment |
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