EP3280000A1 - Dielektrisches filter - Google Patents

Dielektrisches filter Download PDF

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Publication number
EP3280000A1
EP3280000A1 EP15890260.1A EP15890260A EP3280000A1 EP 3280000 A1 EP3280000 A1 EP 3280000A1 EP 15890260 A EP15890260 A EP 15890260A EP 3280000 A1 EP3280000 A1 EP 3280000A1
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EP
European Patent Office
Prior art keywords
connecting rib
cavity
disposed
dielectric filter
cover plate
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.)
Granted
Application number
EP15890260.1A
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English (en)
French (fr)
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EP3280000B1 (de
EP3280000A4 (de
Inventor
Quan LONG
Xiaoyi DENG
Jian Gu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of EP3280000A1 publication Critical patent/EP3280000A1/de
Publication of EP3280000A4 publication Critical patent/EP3280000A4/de
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Publication of EP3280000B1 publication Critical patent/EP3280000B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators
    • 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
    • H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
    • 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
    • H01P1/20309—Strip line filters with dielectric resonator

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a dielectric filter.
  • a dielectric filter is widely applied to various communications systems gradually because of its small size, low loss, and high selectivity.
  • the dielectric filter is designed by using a dielectric material (for example, ceramic) that is characterized by a low loss, a high dielectric constant, a small frequency temperature coefficient, a small coefficient of thermal expansion, high bearable power, and the like.
  • the dielectric filter may be formed by several long-type resonators arranged in multi-level series or parallel longitudinally along a trapezoidal line.
  • Such dielectric filter is characterized by a low insertion loss, a high power capacity, and narrow bandwidth, and is especially suitable for filtering at 900 MHz, 1.8 GHz, 2.4 GHz, and 5.8 GHz, and therefore can be applied to level coupling filtering of a portable phone, a car phone, a wireless headset, a wireless microphone, a radio station, a cordless telephone, an integrated transceiver duplexer, or the like.
  • the dielectric filter includes a cavity, a dielectric resonator fastened in the cavity, a cover plate, and a tuning screw.
  • a TEoi mode dielectric filter is a type of dielectric filter, and has a good single-cavity Q value characteristic.
  • the TEoi mode dielectric filter is widely applied to a wireless communications system, to reduce a system loss and improve efficiency.
  • the TE 01 mode dielectric filter also has the following disadvantages: Because a frequency of a high-order harmonic wave of the TEoi mode dielectric filter is close to a TEoi mode frequency, it is difficult for the TEoi mode dielectric filter to suppress the high-order harmonic wave.
  • the technical problem to be resolved by embodiments of the present invention is to provide a dielectric resonator, to push away a high-order harmonic wave in a dielectric filter, so as to suppress the high-order harmonic wave.
  • a dielectric filter including:
  • the connecting rib is disposed on at least one of the bottom wall of the accommodating cavity, the cover plate, or the cavity wall of the accommodating cavity.
  • the dielectric filter further includes a tuning member, the tuning member is disposed on the cover plate, and a center axis of the tuning member is the same as a center axis of the cover plate; when the connecting rib is disposed on at least one of the bottom wall of the accommodating cavity or the cavity wall of the accommodating cavity, the connecting rib is connected to the support medium and the cavity wall of the accommodating cavity; and when the connecting rib is disposed on the cover plate, the connecting rib is connected to the tuning member and the cavity wall of the accommodating cavity.
  • the radiation plane forms a first projection on the bottom wall; when the connecting rib is disposed on the bottom wall of the accommodating cavity, the connecting rib forms a second projection on the bottom wall, and the second projection overlaps with the first projection on a center line in a direction from the resonator to the cavity wall; when the connecting rib is disposed on the cavity wall, the connecting rib forms a third projection on the bottom wall, and the third projection overlaps with the first projection on a center line in a direction from the resonator to the cavity wall; and when the connecting rib is disposed on the cover plate, the connecting rib forms a fourth projection on the cover plate, and the fourth projection overlaps with the first projection on a center line in a direction from the center axis of the cover plate to the cavity wall.
  • a fourth possible implementation manner when the connecting rib is disposed on the bottom wall of the accommodating cavity, the connecting rib is integrated with the bottom wall; when the connecting rib is disposed on the cavity wall of the accommodating cavity, the connecting rib is integrated with the cavity wall; and when the connecting rib is disposed on the cover plate, the connecting rib is integrated with the cover plate.
  • the connecting rib includes a support part and a first extending part that is formed by extending a first end of the support part in a direction away from the support part, and shortest distances between the support part and the main medium and between the first extending part and the main medium are greater than the preset value.
  • the connecting rib further includes a second extending part, the second extending part is formed by extending, in a direction away from the support part, a second end that is of the support part and that is opposite to the first end, where a shortest distance between the second extending part and the main medium is greater than the preset value.
  • a seventh possible implementation manner of the first aspect or with reference to any one of the first to the sixth possible implementation manners of the first aspect, in a seventh possible implementation manner, there are at least two connecting ribs; and with the center axis of the resonator as a center line, the at least two connecting ribs are evenly arranged around the center line.
  • an eighth possible implementation manner when connecting ribs are disposed on any two of the bottom wall, the cavity wall, and the cover plate, the connecting ribs disposed on the any two of the bottom wall, the cavity wall, and the cover plate are not in contact with each other; or when connecting ribs are disposed on all the bottom wall, the cavity wall, and the cover plate, the connecting ribs disposed on the bottom wall, the cavity wall, and the cover plate are not in contact with each other.
  • the preset value is 2 mm.
  • a dielectric filter component including a low-pass filter and the dielectric resonator according to the foregoing possible implementation manners of the first aspect, where the low-pass filter is cascaded with the dielectric filter.
  • a base station including the dielectric filter component according to the second aspect.
  • the dielectric filter includes a cavity, a resonant cavity, a cover plate, and a connecting rib.
  • the cavity includes an accommodating cavity and a cavity wall surrounding the accommodating cavity.
  • the resonator is disposed inside the accommodating cavity, the resonator includes a support medium and a main medium, the support medium is disposed on a bottom wall of the accommodating cavity, and the main medium is disposed on the support medium.
  • the cover plate covers the cavity to close the accommodating cavity.
  • the connecting rib is accommodated in the accommodating cavity, and is disposed on a radiation plane formed between a radiation radiated from a center axis of the resonator onto the cavity wall and the center axis of the resonator, where a shortest distance between the connecting rib and the main medium is greater than a preset value. Because the connecting rib is disposed on the radiation plane formed between the radiation radiated from the center axis of the resonator onto the cavity wall and the center axis I of the resonator, and the connecting rib is orthogonal to a magnetic field of a high-order harmonic wave of the dielectric filter, the connecting rib affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave.
  • the connecting rib is disposed inside the accommodating cavity, a volume of air in the accommodating cavity becomes smaller, so that the frequency of the high-order harmonic wave becomes higher. This implements a function of pushing away the high-order harmonic wave.
  • the dielectric filter in the present invention also maintains performance of a TEoi mode when pushing away the high-order harmonic wave for suppression.
  • FIG. 1 shows a dielectric filter 100 according to a first embodiment of the present invention.
  • the dielectric filter includes a cavity 10, a resonator 20, a cover plate 30, and a connecting rib 50.
  • the cavity 10 includes an accommodating cavity 11 and a cavity wall 12 surrounding the accommodating cavity 11.
  • the resonator 20 is disposed inside the accommodating cavity 11.
  • the resonator 20 includes a support medium 22 and a main medium 23.
  • the support medium 22 is disposed on a bottom wall 112 of the accommodating cavity 11.
  • the main medium 23 is disposed on the support medium 22.
  • the cover plate 30 covers the cavity 10 to close the accommodating cavity 11.
  • the connecting rib 50 is accommodated in the accommodating cavity 11, and is disposed on a radiation plane formed between a radiation radiated from a center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20.
  • a shortest distance between the connecting rib 50 and the main medium 23 is greater than a preset value.
  • the dielectric filter 100 may be a single-cavity dielectric filter.
  • the cavity wall 12 and the cover plate 30 may be made of a metal material, or a material having a metal-plated surface.
  • the dielectric filter 100 may also be a multi-cavity dielectric filter.
  • the multi-cavity dielectric filter includes multiple single-cavity dielectric filters.
  • the shortest distance between the connecting rib 50 and the main medium 23 is greater than the preset value means that a distance from any part of the connecting rib 50 to any location of the main medium 23 is greater than the preset value.
  • the connecting rib 50 may be disposed on the bottom wall 112.
  • the preset value may be 2 mm.
  • the dielectric filter 100 may be a TEoi mode dielectric filter.
  • the TEoi mode dielectric filter is a filter whose single cavity includes a TEoi mode resonator.
  • a TE mode in field distribution of a waveguide is that: An electric field is fully distributed in a cross section perpendicular to a propagation direction of an electromagnetic wave and a magnetic field has a waveform with a component in a propagation direction.
  • TEoi is the first TE waveform in such type of waveguide.
  • the connecting rib 50 may be made of a conductive material, for example, a metal material such as aluminum.
  • the preset value may be adjusted according to an actual suppression degree requirement of a filter.
  • the dielectric filter 100 may further include a tuning member 40, configured to perform fine-tuning on a working frequency of the filter.
  • the tuning member 40 may be disposed on the cover plate 30, or may be disposed in another manner, such as being fastened to the main medium 23 or being fastened by using pressure between the main medium 23 and the cover plate 30.
  • a specific manner may not be limited in this embodiment of the present invention.
  • the tuning member 40 is disposed on the cover plate 30.
  • the main medium 23, the support medium 22, and the tuning member 40 are disposed coaxially.
  • a diameter of the main medium 23 is greater than a diameter of the support medium 22.
  • the main medium 23 and the support medium 22 are made of different materials.
  • the materials of the main medium 23 and the support medium 22 may be materials, such as ceramic and titanate, that have properties such as a high dielectric constant, a low loss, and a stable temperature coefficient. Specifically, a dielectric constant of the main medium 23 is large, and a dielectric constant of the support medium 22 is small. In this way, most of electromagnetic waves can be trapped inside the main medium 23, and therefore a dielectric loss is small.
  • connecting rib 50 may also be disposed on the cover plate 30 or the cavity wall 12.
  • connecting ribs 50 may be separately disposed on any two of the bottom wall 112, the cover plate 30, and the cavity wall 12, or connecting ribs 50 may be separately disposed on the bottom wall 112, the cover plate 30, and the cavity wall 12.
  • connecting ribs 50 are separately disposed on any two of the bottom wall 112, the cavity wall 12, and the cover plate 30, or connecting ribs 50 are separately disposed on the bottom wall 112, the cavity wall 12, and the cover plate 30, the connecting ribs 50 disposed on the any two of the bottom wall 112, the cavity wall 12, and the cover plate 30 are not in contact with each other, or the connecting ribs 50 disposed on the bottom wall 112, the cavity wall 12, and the cover plate 30 are not in contact with each other, so as to prevent structural interference from affecting performance of the filter.
  • the center axis I of the resonator 20 may be the same as a center axis I of the cover plate 30.
  • a center axis I of the tuning member 40 may be the same as the center axis I of the cover plate 30.
  • the connecting rib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20, so that the connecting rib 50 may be perpendicular to a magnetic field of a high-order harmonic wave, so as to affect a path of the magnetic field of the high-order harmonic wave, thereby changing a frequency of the high-order harmonic wave.
  • a TEoi mode dielectric filter has a characteristic that a frequency of a high-order harmonic wave is close to a TE 01 mode frequency.
  • FIG. 3 is a diagram of electric field distribution of a TEoi mode of a TEoi mode dielectric filter on which no connecting rib is disposed.
  • FIG. 4 is a diagram of magnetic field distribution of a TEoi mode of a TEoi mode dielectric filter on which no connecting rib is disposed.
  • FIG. 5 is a diagram of electric field distribution of a high-order harmonic wave of a TEoi mode dielectric filter on which no connecting rib is disposed.
  • FIG. 6 is a diagram of magnetic field distribution of a TEoi mode of a TEoi mode dielectric filter on which no connecting rib is disposed.
  • an electric field of the TEoi mode is mainly concentrated at a main medium.
  • the connecting rib 50 is accommodated in the accommodating cavity 11, and a shortest distance between the connecting rib 50 and the main medium 23 is greater than the preset value. Impact of the connecting rib 50 on the electric field is very small, and can be ignored.
  • a magnetic field of the TEoi mode is of a turbine shape.
  • the connecting rib 50 is accommodated in the accommodating cavity 11, and is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20, that is, the connecting rib 50 is in a tangent line direction of the magnetic field. Therefore, the connecting rib 50 almost does not affect the magnetic field.
  • the connecting rib 50 almost does not affect the TE 01 mode, and therefore a frequency and a Q value of the TE 01 mode of the dielectric filter 100 is almost unchanged. In this way, performance of the TEoi mode is maintained. The performance of the TE 01 mode is reflected by the frequency and the Q value of the TEoi mode.
  • the Q value of the TEoi mode is a ratio of stored energy to lost energy in a resonant period.
  • a part of an electric field of the high-order harmonic wave is upwards perpendicular to a peripheral wall of the main medium 23, and the other parts of the electric field of the high-order harmonic wave are substantially perpendicular to a top surface and a bottom surface of the main medium 23.
  • a direction of the part of the electric field that is of the high-order harmonic wave and that is perpendicular to the main medium 23 is parallel to an arrangement direction of the connecting rib 50; and the part that is of the electric field and that is perpendicular to the top surface and the bottom surface of the main medium 23 is parallel to a side surface of the connecting rib 50. Therefore, impact of the connecting rib 50 on the electric field of the high-order harmonic wave is very small, and can be ignored.
  • a magnetic field of the high-order harmonic wave is distributed surrounding the main medium, the support medium, a mounting table, and the tuning member.
  • the connecting rib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20, that is, the connecting rib 50 is orthogonal to the magnetic field. Therefore, the connecting rib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave. Further, because the connecting rib 50 is disposed inside the accommodating cavity 11, a volume of air in the accommodating cavity 11 becomes smaller, so that the frequency of the high-order harmonic wave becomes higher. Therefore, a function of pushing away the high-order harmonic wave is implemented.
  • the dielectric filter 100 includes the connecting rib 50.
  • the connecting rib 50 is accommodated in the accommodating cavity 11, and is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20.
  • a shortest distance between the connecting rib 50 and the main medium 23 is greater than a preset value.
  • the connecting rib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20, and the connecting rib 50 is orthogonal to the magnetic field of the high-order harmonic wave of the dielectric filter 100, the connecting rib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave. Further, because the connecting rib 50 is disposed inside the accommodating cavity 11, a volume of air in the accommodating cavity 11 becomes smaller, so that a frequency of the high-order harmonic wave becomes higher. Therefore, a function of pushing away the high-order harmonic wave is implemented.
  • the dielectric filter 100 in the present invention also maintains performance of a TEoi mode when pushing away the high-order harmonic wave for suppression.
  • a push-away effect of the connecting rib 50 on the high-order harmonic wave depends on a volume that is of the accommodating cavity 11 and that is occupied by the connecting rib 50, regardless of a location that is on the accommodating cavity 11 and at which the connecting rib 50 is disposed.
  • a larger volume that is of the accommodating cavity 11 and that is occupied by the connecting rib 50 indicates a smaller volume of air in the accommodating cavity 11, resulting in a higher frequency of the high-order harmonic wave. Therefore, the push-away effect on the high-order harmonic wave is better.
  • the resonant cavity 20 may further include a mounting table 21.
  • the mounting table 21 is disposed on the bottom wall 112 of the accommodating cavity 11.
  • the support medium 22 is disposed on the bottom wall 112 of the accommodating cavity 11 by using the mounting table 21.
  • the mounting table 21 may be made of a metal material such as aluminum. It has been experimentally found that an effect of the solution provided in this embodiment of the present invention is better when the resonator 20 is fastened by using the mounting table 21. However, it may be understood that, for a specific manner for fastening a resonant cavity, refer to some existing manners or some manners emerging in the future. This does not affect application of the present invention, and details are not described herein.
  • the connecting rib 50 may also not be limited to being disposed only on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20.
  • the connecting rib 50 is disposed in a tangent line direction of a magnetic field of a TEoi mode, the connecting rib 50 is orthogonal to a magnetic field of a high-order harmonic wave of the dielectric filter 100. This affects a path of the magnetic field of the high-order harmonic wave, resulting in a change in a frequency of the high-order harmonic wave, thereby achieving a same effect on pushing away the high-order harmonic wave.
  • the connecting rib 50 affects the path of the magnetic field of the high-order harmonic wave, and the frequency of the high-order harmonic wave can be changed, just bringing less impact on the path of the magnetic field of the high-order harmonic wave and changing the frequency of the high-order harmonic wave in comparison with impact caused due to that the connecting rib 50 is orthogonal to the magnetic field of the high-order harmonic wave.
  • the connecting rib 50 when the connecting rib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of the resonator 20 onto the cavity wall 12 and the center axis I of the resonator 20, the connecting rib 50 can push away the high-order harmonic wave to a greatest extent.
  • the connecting rib 50 may connect the support medium 22 and the cavity wall 12.
  • the connecting rib 50 may connect the mounting table 21 and the cavity wall 12.
  • the connecting rib 50 when the connecting rib 50 is disposed on the cover plate 30, the connecting rib 50 may connect the tuning member 40 and the cavity wall 12. When the connecting rib 50 is disposed on the cavity wall 12, the connecting rib 50 may connect the support medium 22 and the cavity wall 12.
  • the connecting rib 50 when the connecting rib 50 connects the mounting table 21 (or the support medium 22) and the cavity wall 12, or in another embodiment, when the connecting rib 50 connects the tuning member 40 and the cavity wall 12, the connecting rib 50 has a longest length. When a height of the connecting rib 50 is constant, the connecting rib 50 has a longest length. Therefore, an area that is of the connecting rib 50 and that is perpendicular to the magnetic field of the high-order harmonic wave is largest, and greatest impact on the magnetic field of the high-order harmonic wave is caused. Therefore, a best effect of pushing away the high-order harmonic wave is achieved.
  • the connecting rib 50 when the connecting rib 50 is disposed on the bottom wall 112, the connecting rib 50 may be integrated with the bottom wall 112.
  • the connecting rib 50 When the connecting rib 50 is disposed on the cavity wall 12, the connecting rib 50 may be integrated with the cavity wall 12.
  • the connecting rib 50 When the connecting rib 50 is disposed on the cover plate 30, the connecting rib 50 may be integrated with the cover plate30. Therefore, when the connecting rib 50 is disposed on at least one of the bottom wall 112 or the cavity wall 12, the connecting rib 50 may be formed by performing die casting on the cavity 10; and when the connecting rib 50 is disposed on the cover plate 30, the connecting rib 50 may be formed by performing die casting on the cover plate 30, without additional costs.
  • the at least two connecting ribs 50 there are at least two connecting ribs 50. With the center axis I of the resonator 20 as a center line, the at least two connecting ribs 50 are evenly arranged surrounding the center line.
  • the radiation plane forms a first projection on the bottom wall.
  • the connecting ribs 50 are symmetrically arranged on the bottom wall 112 in a cross manner.
  • the connecting rib 50 is of a cuboid shape.
  • a cross section of the connecting rib 50 is rectangular.
  • a longitudinal section of the connecting rib 50 is rectangular.
  • the connecting rib 50 forms a second projection on the bottom wall 112.
  • the second projection overlaps with the first projection on a center line in a direction from the resonator 20 to the cavity wall 12. Therefore, the connecting rib 50 is orthogonal to the magnetic field of the high-order harmonic wave. This more effectively changes a path of the magnetic field, and better improves a frequency of the high-order harmonic wave.
  • connecting rib 50 may also be of another shape, such as an L shape, and the cross section and the longitudinal section of the connecting rib 50 may also be of other shapes.
  • the shape of the connecting rib 50, shapes of the cross section and the longitudinal section thereof, and whether the connecting rib 50 is of a symmetrical structure do not affect a push-away effect on the high-order harmonic wave in the present invention. This is not limited herein.
  • the connecting rib 50 when the connecting rib 50 is disposed on the cavity wall 12, the connecting rib 50 forms a third projection on the bottom wall 112. The third projection overlaps with the first projection on a center line in a direction from the resonator 20 to the cavity wall 12.
  • the connecting rib 50 when the connecting rib 50 is disposed on the cover plate 30, the connecting rib 50 forms a fourth projection on the cover plate 30. The fourth projection overlaps with the first projection on a center line in a direction from a center axis of the cover plate 30 to the cavity wall 12.
  • each connecting rib 50 is independent, and shapes of multiple connecting ribs 50 may also not be exactly the same. In this embodiment, shapes of the connecting ribs 50 are the same.
  • a larger quantity of the connecting ribs 50 indicates a smaller volume of air in the accommodating cavity 11 and a higher frequency of the high-order harmonic wave. Therefore, the connecting ribs 50 have a better push-away effect on the high-order harmonic wave.
  • the connecting rib 50 is a square with a height set to 8 mm.
  • quantities of the connecting ribs 50 are 1, 2, and 4 respectively, it has been experimentally obtained that frequencies of the high-order harmonic wave are pushed up by 70 MHz, 170 MHz, and 310 MHz respectively by using one connecting rib 50, two connecting ribs 50, and four connecting ribs 50.
  • FIG. 8 shows another dielectric filter 200 according to the first embodiment of the present invention.
  • the dielectric filter 200 provided in the second embodiment is similar to the dielectric filter 100 provided in the first embodiment.
  • a difference between the two dielectric filters lies in that:
  • a connecting rib 210 is approximately of an "L" shape.
  • the connecting rib 210 includes a support part 211 and a first extending part 212 that is formed by extending from a first end of the support part 211 in a direction away from the support part. Shortest distances between the support part 211 and the main medium 23 and between the first extending part 212 and the main medium 23 are greater than a preset value.
  • the first end of the support part 211 is an end far away from the resonator 20.
  • the first end of the support part 211 may also be an end close to the resonator 20.
  • a height of the first extending part 212 may be adjusted according to actual needs.
  • the height of the first extending part 212 may reach a top part of the cavity 10, provided that the first extending part 212 does not touch the cover plate 30, and the shortest distance between the first extending part 212 and the main medium 23 is greater than the preset value.
  • the connecting rib 210 is disposed on the cover plate, the height of the first extending part 210 may be adjusted according to actual needs, provided that the first extending part 212 does not touch the bottom wall 112, and the shortest distance between the first extending part 212 and the main medium 23 is greater than the preset value.
  • a higher height of the first extending part 212 indicates a larger volume of the connecting rib 210, and therefore a larger volume of the accommodating cavity is occupied, resulting in a smaller volume of air in the accommodating cavity and a higher frequency of the high-order harmonic wave. This has a better push-away effect on the high-order harmonic wave.
  • the shortest distance between the support part 211 and the main medium 23 may be greater than a first preset value, and the shortest distance between the first extending part 212 and the main medium 23 may be greater than a second preset value.
  • the first preset value is different from the second preset value.
  • the second preset value may be set to be greater than the first preset value.
  • FIG. 9 shows a dielectric filter 300 according to a third embodiment of the present invention.
  • the dielectric filter 300 provided in the third embodiment is similar to the dielectric filter 200 provided in the second embodiment.
  • a difference between the two dielectric filters lies in that:
  • the connecting rib 310 further includes a second extending part 312.
  • the second extending part 312 is formed by extending, in a direction away from the support part 211, a second end that is of the support part 211 and that is opposite to the first end.
  • a shortest distance between the second extending part 312 and the main medium 23 is greater than the preset value.
  • connecting ribs 210 there are at least two connecting ribs 210, and all the connecting ribs 210 are of a concave shape.
  • a height of the second extending part 312 may be adjusted according to actual needs, provided that the second extending part 312 does not touch the cover plate 30, and the shortest distance between the second extending part 312 and the main medium 23 is greater than the preset value.
  • the connecting rib 310 is disposed on the cover plate 30, the height of the second extending part 310 may be adjusted according to actual needs, provided that the second extending part 312 does not touch the bottom wall 112, and the shortest distance between the second extending part 312 and the main medium 23 is greater than the preset value.
  • a higher height of the second extending part 312 indicates a larger volume of the connecting rib 310, and therefore a larger volume of the accommodating cavity 12 is occupied, resulting in a smaller volume of air in the accommodating cavity 12 and a higher frequency of the high-order harmonic wave. This has a better push-away effect on the high-order harmonic wave.
  • a height of the support part 211 is 8 mm.
  • the first extending part 212 has a same height as that of a top part of the cavity wall 12.
  • the second extending part 312 is a square of 5*5. It has been experimentally obtained that a frequency of the high-order harmonic wave is pushed up to 370 MHz from 310 MHz at which there is no second extending part 312.
  • a shortest distance between the support part 211 and the main medium 23 may be greater than a first preset value, and a shortest distance between the first extending part 212 and the main medium is greater than a second preset value.
  • the shortest distance between the second extending part 312 and the main medium 23 is greater than a third value.
  • the first preset value may be different from the second preset value and the third preset value.
  • the second preset value may also be different from the third preset value.
  • the first extending part 212 has greater impact on a magnetic field in which the main medium 23 is located.
  • the second extending part 312 has greater impact on the magnetic field in which the main medium 23 is located. Therefore, both the second preset value and the third preset value may be set to be greater than the first preset value.
  • a dielectric filter may also include any dielectric filter in one or more of the foregoing embodiments.
  • cavity walls thereof may be connected, and cover plates thereof may also be connected.
  • cover plates thereof may also be connected.
  • a combination manner refer to an existing manner or a manner emerging in the future, and details are not described herein.
  • FIG. 10 shows a dielectric filter component 1000 according to a second embodiment of the present invention.
  • the dielectric filter component 1000 includes a low-pass filter 1100 and a dielectric filter.
  • the low-pass filter 1100 is cascaded with the dielectric filter, to achieve better filter performance.
  • the low-pass filter 1100 is cascaded with the dielectric filter, to provide suppression on the high-order harmonic wave of the TEoi mode, so that a better filtering effect is achieved after the dielectric filter is cascaded with the low-pass filter 1100.
  • a cut-off frequency of the low-pass filter needs to keep a specific spacing from a passband frequency of the dielectric filter.
  • the passband frequency of the dielectric filter is 2620 MHz to 2690 MHz, and the cut-off frequency of the low-pass filter 1100 is generally required to be higher than 3200 MHz. Therefore, the low-pass filter 1100 can provide suppression on only a high-order harmonic wave that is generated in the dielectric filter and whose frequency is higher than 3200 MHz. If the connecting rib 50 pushes away, a frequency of a high-order harmonic wave whose frequency is lower than 3200 MHz to higher than 3200 MHz, so that the low-pass filter can suppress the harmonic wave to obtain good overall filter performance.
  • the dielectric filter is the dielectric filter 100 provided in the first embodiment.
  • the structure and function of the dielectric filter 100 have been described in detail in the first embodiment, and therefore details are not described herein again.
  • FIG. 11 shows a base station 2000 according to a third embodiment of the present invention.
  • the base station 2000 includes the dielectric filter 100 provided in the first embodiment or the dielectric filter component 1000 provided in the second embodiment.
  • the dielectric filter component 1000 includes a low-pass filter 1100 and a dielectric filter.
  • the low-pass filter 1100 is cascaded with the dielectric filter, to achieve better filter performance.
  • the dielectric filter is the dielectric filter 100 provided in the first embodiment. The structure and function of the dielectric filter 100 have been described in detail in the first embodiment, and therefore details are not described herein again.
  • the dielectric filter may also be the another dielectric filter provided in the first embodiment.
  • the dielectric filter 100 is also applied to a radio frequency module.
  • the radio frequency module may be a radio frequency module in the base station 2000, or may be a radio frequency module in another communications device, such as in a radar system.
  • the dielectric filter 100 may also be used for a transceiver, and the like.
  • the transceiver may also be a module in the base station 2000.
  • the base station 2000 includes the dielectric filter component 1000.
  • the dielectric filter component 1000 includes the low-pass filter 1100 and the dielectric filter 100.
  • the dielectric filter 100 includes the connecting rib 50.
  • the connecting rib 50 is accommodated in an accommodating cavity 11. A shortest distance between the connecting rib 50 and a main medium 23 is greater than a preset value. Because the connecting rib 50 is orthogonal to a magnetic field of a high-order harmonic wave of the dielectric filter 100, the connecting rib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave.
  • the base station 2000 of the present invention also maintains performance of the TEoi mode when pushing away the high-order harmonic wave for suppression.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP15890260.1A 2015-04-29 2015-04-29 Dielektrisches filter Active EP3280000B1 (de)

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PCT/CN2015/077805 WO2016172880A1 (zh) 2015-04-29 2015-04-29 一种介质滤波器

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EP3280000A1 true EP3280000A1 (de) 2018-02-07
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EP3280000B1 EP3280000B1 (de) 2021-06-02

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CN111816971A (zh) * 2020-08-07 2020-10-23 物广系统有限公司 一种控制谐波远近的谐振结构及介质滤波器
CN117578053B (zh) * 2024-01-17 2024-03-29 成都宇恒博电子科技有限公司 一种改善滤波器带外抑制性能的腔体滤波器

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JPH04104501A (ja) * 1990-08-23 1992-04-07 Fujitsu Ltd 誘電体フィルタ
IT1264648B1 (it) * 1993-07-02 1996-10-04 Sits Soc It Telecom Siemens Risonatore sintonizzzabile per oscillatori e filtri alle microonde
KR20000026761A (ko) * 1998-10-23 2000-05-15 구관영 가변형 외장 노치 케이블을 갖는 유전체 공진기 대역 통과 필터
DE19921926A1 (de) * 1999-05-12 2000-11-16 Bosch Gmbh Robert Dielektrisches Mikrowellenfilter
JP3480381B2 (ja) * 1999-08-24 2003-12-15 株式会社村田製作所 誘電体共振器装置、誘電体フィルタ、複合誘電体フィルタ装置、誘電体デュプレクサおよび通信装置
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CN104037478B (zh) * 2014-05-27 2017-06-27 京信通信系统（中国）有限公司 介质滤波器

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CN107112616A (zh) 2017-08-29
KR20170139662A (ko) 2017-12-19
KR102013056B1 (ko) 2019-08-21
WO2016172880A1 (zh) 2016-11-03
EP3280000B1 (de) 2021-06-02
EP3280000A4 (de) 2018-04-11
CN107112616B (zh) 2020-01-03

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