EP3280000B1 - Dielectric filter - Google Patents
Dielectric filter Download PDFInfo
- Publication number
- EP3280000B1 EP3280000B1 EP15890260.1A EP15890260A EP3280000B1 EP 3280000 B1 EP3280000 B1 EP 3280000B1 EP 15890260 A EP15890260 A EP 15890260A EP 3280000 B1 EP3280000 B1 EP 3280000B1
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- EP
- European Patent Office
- Prior art keywords
- connecting rib
- disposed
- cavity
- dielectric filter
- cover plate
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- 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.)
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- 230000005855 radiation Effects 0.000 claims description 24
- 230000000694 effects Effects 0.000 description 13
- 230000005684 electric field Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000001629 suppression Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
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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
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- 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 TE 01 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 TE 01 mode dielectric filter is close to a TE 01 mode frequency, it is difficult for the TEoi mode dielectric filter to suppress the high-order harmonic wave.
- From EP 1 104 043 A1 multimode dielectric filters are known.
- From EP 1 301 961 A1 RF filters comprising a dielectric housing with a cavity are known.
- From EP 1 079 457 A2 dielectric resonators for RF applications are known.
- From US 6,717,490 B1 and CN 104 037 478 A dielectric RF filters comprising a cavity where microwaves can propagate are known.
- a dielectric filter according to independent claim 1, a dielectric filter component and a base station are provided.
- Dependent claims provide preferred embodiments.
- the dielectric filter includes a cavity, a resonator, 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 TE 01 mode when pushing away the high-order harmonic wave for suppression.
- FIG. 1 shows a dielectric filter 100.
- 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. Certainly, 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 TEoi 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 TE 01 mode dielectric filter on which no connecting rib is disposed.
- FIG. 6 is a diagram of magnetic field distribution of a TE 01 mode of a TE 01 mode dielectric filter on which no connecting rib is disposed.
- the connecting rib 50 almost does not affect the TE 01 mode, and therefore a frequency and a Q value of the TEoi 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 TE 01 mode.
- the Q value of the TEoi mode is a ratio of stored energy to lost energy in a resonant period.
- 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 resonator 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 resonator, 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. Provided that the connecting rib 50 is disposed in a tangent line direction of a magnetic field of a TE 01 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 when the resonator 20 further includes the mounting table 21 and the support medium 22 is disposed on the bottom wall 112 of the accommodating cavity 11 by using the mounting table 21, 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.
- the connecting rib 50 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. 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.
- the dielectric filter 200 is similar to the dielectric filter 100.
- 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 212 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 an embodiment of the present invention.
- the dielectric filter 300 provided in the embodiment is similar to the dielectric filter 200.
- 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 310 there are at least two connecting ribs 310, and all the connecting ribs 310 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 312 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.
- Impact of the shape of the connecting rib 310 on the push-away effect of the high-order harmonic wave is illustrated herein by using an example.
- 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 TE 01 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.
- the dielectric filter may also be the another dielectric filter.
- FIG. 11 shows a base station 2000.
- the base station 2000 includes the dielectric filter 100 or the dielectric filter component 1000
- 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 The structure and function of the dielectric filter 100 have been described in detail Previously, and therefore details are not described herein again.
- the dielectric filter may also be the another dielectric filter.
- 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
- 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. 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 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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Description
- The present invention relates to the field of communications technologies, and in particular, to a dielectric filter.
- Due to the development of radio communications technologies, a high-performance filter is required in a low-cost and high-performance wireless communications transceiver system. 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. Generally, 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. Therefore, the TE01 mode dielectric filter is widely applied to a wireless communications system, to reduce a system loss and improve efficiency. However, the TE01 mode dielectric filter also has the following disadvantages: Because a frequency of a high-order harmonic wave of the TE01 mode dielectric filter is close to a TE01 mode frequency, it is difficult for the TEoi mode dielectric filter to suppress the high-order harmonic wave.
- From
EP 1 104 043 A1 multimode dielectric filters are known. FromEP 1 301 961 A1 RF filters comprising a dielectric housing with a cavity are known. FromEP 1 079 457 A2 dielectric resonators for RF applications are known. Also, fromUS 6,717,490 B1 andCN 104 037 478 A dielectric RF filters comprising a cavity where microwaves can propagate are known. - A dielectric filter according to independent claim 1, a dielectric filter component and a base station are provided. Dependent claims provide preferred embodiments.
- 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. In the present invention, the dielectric filter includes a cavity, a resonator, 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. Further, because 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 TE01 mode when pushing away the high-order harmonic wave for suppression.
- To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
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FIG. 1 is a schematic exploded view of a part of a dielectric filter; -
FIG. 2 is a longitudinal sectional view ofFIG. 1 ; -
FIG. 3 is a diagram of electric field distribution of a TEoi mode of a TE01 mode dielectric filter on which no connecting rib is disposed; -
FIG. 4 is a diagram of magnetic field distribution of a TE01 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; -
FIG. 7 is a top view of a cavity inFIG. 1 ; -
FIG. 8 is a longitudinal sectional view of another dielectric filter; -
FIG. 9 is a longitudinal sectional view of still another dielectric filter according to a first embodiment of the present invention; -
FIG. 10 is a block diagram of a dielectric filter component according to a second embodiment of the present invention; and -
FIG. 11 is a block diagram of a base station according to a third embodiment of the present invention. - The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some but not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
- In the specification, claims, and accompanying drawings of the present invention, the terms "first", "second", "third", "fourth", and so on (if existent) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence. It should be understood that the data termed in such a way are interchangeable in proper circumstances so that the embodiments of the present invention described herein can be implemented in orders except the order illustrated or described herein. Moreover, the terms "include", "contain" and any other variants mean to cover the non-exclusive inclusion, for example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those units, but may include other units not expressly listed or inherent to such a process, method, system, product, or device.
- The following provides detailed descriptions separately by using specific embodiments.
- Referring to
FIG. 1, FIG. 1 shows adielectric filter 100. The dielectric filter includes acavity 10, aresonator 20, acover plate 30, and a connectingrib 50. Thecavity 10 includes anaccommodating cavity 11 and acavity wall 12 surrounding theaccommodating cavity 11. Theresonator 20 is disposed inside theaccommodating cavity 11. Theresonator 20 includes asupport medium 22 and amain medium 23. Thesupport medium 22 is disposed on abottom wall 112 of theaccommodating cavity 11. Themain medium 23 is disposed on thesupport medium 22. Thecover plate 30 covers thecavity 10 to close theaccommodating cavity 11. The connectingrib 50 is accommodated in theaccommodating cavity 11, and is disposed on a radiation plane formed between a radiation radiated from a center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20. A shortest distance between the connectingrib 50 and themain medium 23 is greater than a preset value. - The
dielectric filter 100 may be a single-cavity dielectric filter. Generally, thecavity wall 12 and thecover plate 30 may be made of a metal material, or a material having a metal-plated surface. In another embodiment, thedielectric filter 100 may also be a multi-cavity dielectric filter. The multi-cavity dielectric filter includes multiple single-cavity dielectric filters. - It should be noted that, that the shortest distance between the connecting
rib 50 and themain medium 23 is greater than the preset value means that a distance from any part of the connectingrib 50 to any location of themain medium 23 is greater than the preset value. - In this embodiment, the connecting
rib 50 may be disposed on thebottom wall 112. The preset value may be 2 mm. Thedielectric 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 connectingrib 50 may be made of a conductive material, for example, a metal material such as aluminum. In another embodiment, the preset value may be adjusted according to an actual suppression degree requirement of a filter. - Optionally, the
dielectric filter 100 may further include a tuningmember 40, configured to perform fine-tuning on a working frequency of the filter. The tuningmember 40 may be disposed on thecover 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 themain medium 23 and thecover plate 30. A specific manner may not be limited in this embodiment of the present invention. For example, the tuningmember 40 is disposed on thecover plate 30. Themain medium 23, thesupport medium 22, and the tuningmember 40 are disposed coaxially. A diameter of themain medium 23 is greater than a diameter of thesupport medium 22. Themain medium 23 and thesupport medium 22 are made of different materials. The materials of themain medium 23 and thesupport 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 themain medium 23 is large, and a dielectric constant of thesupport medium 22 is small. In this way, most of electromagnetic waves can be trapped inside themain medium 23, and therefore a dielectric loss is small. - The connecting
rib 50 may also be disposed on thecover plate 30 or thecavity wall 12. Certainly, connectingribs 50 may be separately disposed on any two of thebottom wall 112, thecover plate 30, and thecavity wall 12, or connectingribs 50 may be separately disposed on thebottom wall 112, thecover plate 30, and thecavity wall 12. - It should be noted that, when connecting
ribs 50 are separately disposed on any two of thebottom wall 112, thecavity wall 12, and thecover plate 30, or connectingribs 50 are separately disposed on thebottom wall 112, thecavity wall 12, and thecover plate 30, the connectingribs 50 disposed on the any two of thebottom wall 112, thecavity wall 12, and thecover plate 30 are not in contact with each other, or the connectingribs 50 disposed on thebottom wall 112, thecavity wall 12, and thecover plate 30 are not in contact with each other, so as to prevent structural interference from affecting performance of the filter. - Optionally, the center axis I of the
resonator 20 may be the same as a center axis I of thecover plate 30. - Optionally, a center axis I of the tuning
member 40 may be the same as the center axis I of thecover plate 30. - It should be noted that the connecting
rib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20, so that the connectingrib 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 TEoi mode frequency. Referring to
FIG. 3 to FIG. 6 ,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 TE01 mode dielectric filter on which no connecting rib is disposed.FIG. 6 is a diagram of magnetic field distribution of a TE01 mode of a TE01 mode dielectric filter on which no connecting rib is disposed. - For the TEoi mode:
- In
FIG. 3 , an electric field of the TE01 mode is mainly concentrated at a main medium. In this embodiment of the present invention, the connectingrib 50 is accommodated in theaccommodating cavity 11, and a shortest distance between the connectingrib 50 and themain medium 23 is greater than the preset value. Impact of the connectingrib 50 on the electric field is very small, and can be ignored. - In
FIG. 4 , a magnetic field of the TE01 mode is of a turbine shape. The connectingrib 50 is accommodated in theaccommodating cavity 11, and is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20, that is, the connectingrib 50 is in a tangent line direction of the magnetic field. Therefore, the connectingrib 50 almost does not affect the magnetic field. - Therefore, it may be learnt by means of analysis that the connecting
rib 50 almost does not affect the TE01 mode, and therefore a frequency and a Q value of the TEoi mode of thedielectric filter 100 is almost unchanged. In this way, performance of the TEoi mode is maintained. The performance of the TE01 mode is reflected by the frequency and the Q value of the TE01 mode. The Q value of the TEoi mode is a ratio of stored energy to lost energy in a resonant period. - For a high-order harmonic wave:
- In
FIG. 5 , a part of an electric field of the high-order harmonic wave is upwards perpendicular to a peripheral wall of themain 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 themain medium 23. A direction of the part of the electric field that is of the high-order harmonic wave and that is perpendicular to themain medium 23 is parallel to an arrangement direction of the connectingrib 50; and the part that is of the electric field and that is perpendicular to the top surface and the bottom surface of themain medium 23 is parallel to a side surface of the connectingrib 50. Therefore, impact of the connectingrib 50 on the electric field of the high-order harmonic wave is very small, and can be ignored. - In
FIG. 6 , 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 connectingrib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20, that is, the connectingrib 50 is orthogonal to the magnetic field. Therefore, the connectingrib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave. Further, because the connectingrib 50 is disposed inside theaccommodating cavity 11, a volume of air in theaccommodating 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. - Therefore, according to the foregoing analysis, in this embodiment, the
dielectric filter 100 includes the connectingrib 50. The connectingrib 50 is accommodated in theaccommodating cavity 11, and is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20. A shortest distance between the connectingrib 50 and themain medium 23 is greater than a preset value. Because the connectingrib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20, and the connectingrib 50 is orthogonal to the magnetic field of the high-order harmonic wave of thedielectric filter 100, the connectingrib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave. Further, because the connectingrib 50 is disposed inside theaccommodating cavity 11, a volume of air in theaccommodating 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. Thedielectric filter 100 in the present invention also maintains performance of a TEoi mode when pushing away the high-order harmonic wave for suppression. - It should be noted that a push-away effect of the connecting
rib 50 on the high-order harmonic wave depends on a volume that is of theaccommodating cavity 11 and that is occupied by the connectingrib 50, regardless of a location that is on theaccommodating cavity 11 and at which the connectingrib 50 is disposed. A larger volume that is of theaccommodating cavity 11 and that is occupied by the connectingrib 50 indicates a smaller volume of air in theaccommodating 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. - Optionally, the
resonator 20 may further include a mounting table 21. The mounting table 21 is disposed on thebottom wall 112 of theaccommodating cavity 11. Thesupport medium 22 is disposed on thebottom wall 112 of theaccommodating 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 theresonator 20 is fastened by using the mounting table 21. However, it may be understood that, for a specific manner for fastening a resonator, 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 theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20. Provided that the connectingrib 50 is disposed in a tangent line direction of a magnetic field of a TE01 mode, the connectingrib 50 is orthogonal to a magnetic field of a high-order harmonic wave of thedielectric 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. - In addition, provided that the connecting
rib 50 is not disposed in parallel to the magnetic field of the high-order harmonic wave, the connectingrib 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 connectingrib 50 is orthogonal to the magnetic field of the high-order harmonic wave. Therefore, when the connectingrib 50 is disposed on the radiation plane formed between the radiation radiated from the center axis I of theresonator 20 onto thecavity wall 12 and the center axis I of theresonator 20, the connectingrib 50 can push away the high-order harmonic wave to a greatest extent. Optionally, the connectingrib 50 may connect thesupport medium 22 and thecavity wall 12. When theresonator 20 further includes the mounting table 21 and thesupport medium 22 is disposed on thebottom wall 112 of theaccommodating cavity 11 by using the mounting table 21, the connectingrib 50 may connect the mounting table 21 and thecavity wall 12. In another embodiment, when the connectingrib 50 is disposed on thecover plate 30, the connectingrib 50 may connect the tuningmember 40 and thecavity wall 12. When the connectingrib 50 is disposed on thecavity wall 12, the connectingrib 50 may connect thesupport medium 22 and thecavity wall 12. - It should be noted that when the connecting
rib 50 connects the mounting table 21 (or the support medium 22) and thecavity wall 12, or in another embodiment, when the connectingrib 50 connects the tuningmember 40 and thecavity wall 12, the connectingrib 50 has a longest length. When a height of the connectingrib 50 is constant, the connectingrib 50 has a longest length. Therefore, an area that is of the connectingrib 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. Optionally, when the connectingrib 50 is disposed on thebottom wall 112, the connectingrib 50 may be integrated with thebottom wall 112. When the connectingrib 50 is disposed on thecavity wall 12, the connectingrib 50 may be integrated with thecavity wall 12. When the connectingrib 50 is disposed on thecover plate 30, the connectingrib 50 may be integrated with the cover plate30. Therefore, when the connectingrib 50 is disposed on at least one of thebottom wall 112 or thecavity wall 12, the connectingrib 50 may be formed by performing die casting on thecavity 10; and when the connectingrib 50 is disposed on thecover plate 30, the connectingrib 50 may be formed by performing die casting on thecover plate 30, without additional costs. - Referring to
FIG. 7 , optionally, there are at least two connectingribs 50. With the center axis I of theresonator 20 as a center line, the at least two connectingribs 50 are evenly arranged surrounding the center line. The radiation plane forms a first projection on the bottom wall. Specifically, in this embodiment, there are four connectingribs 50. The connectingribs 50 are symmetrically arranged on thebottom wall 112 in a cross manner. The connectingrib 50 is of a cuboid shape. A cross section of the connectingrib 50 is rectangular. A longitudinal section of the connectingrib 50 is rectangular. The connectingrib 50 forms a second projection on thebottom wall 112. The second projection overlaps with the first projection on a center line in a direction from theresonator 20 to thecavity wall 12. Therefore, the connectingrib 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. - It should be noted that the connecting
rib 50 may also be of another shape, such as an L shape, and the cross section and the longitudinal section of the connectingrib 50 may also be of other shapes. The shape of the connectingrib 50, shapes of the cross section and the longitudinal section thereof, and whether the connectingrib 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. - When the connecting
rib 50 is disposed on thecavity wall 12, the connectingrib 50 forms a third projection on thebottom wall 112. The third projection overlaps with the first projection on a center line in a direction from theresonator 20 to thecavity wall 12. When the connectingrib 50 is disposed on thecover plate 30, the connectingrib 50 forms a fourth projection on thecover plate 30. The fourth projection overlaps with the first projection on a center line in a direction from a center axis of thecover plate 30 to thecavity wall 12. - It should be noted that each connecting
rib 50 is independent, and shapes of multiple connectingribs 50 may also not be exactly the same. In this embodiment, shapes of the connectingribs 50 are the same. - For a quantity of the connecting ribs: A larger quantity of the connecting
ribs 50 indicates a smaller volume of air in theaccommodating cavity 11 and a higher frequency of the high-order harmonic wave. Therefore, the connectingribs 50 have a better push-away effect on the high-order harmonic wave. - Impact of the quantity of the connecting
ribs 50 on the push-away effect of the high-order harmonic wave is illustrated herein by using an example. The connectingrib 50 is a square with a height set to 8 mm. When quantities of the connectingribs 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 connectingrib 50, two connectingribs 50, and four connectingribs 50. - Referring to
FIG. 8, FIG. 8 shows anotherdielectric filter 200. Thedielectric filter 200 is similar to thedielectric filter 100. A difference between the two dielectric filters lies in that: In thefilter 200, a connectingrib 210 is approximately of an "L" shape. The connectingrib 210 includes asupport part 211 and a first extendingpart 212 that is formed by extending from a first end of thesupport part 211 in a direction away from the support part. Shortest distances between thesupport part 211 and themain medium 23 and between the first extendingpart 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 theresonator 20. There may be at least two connectingribs 210, and the connectingribs 210 all are of an "L" shape. In another embodiment, the first end of thesupport part 211 may also be an end close to theresonator 20. - When the connecting
rib 210 is disposed on thebottom wall 112, a height of the first extendingpart 212 may be adjusted according to actual needs. The height of the first extendingpart 212 may reach a top part of thecavity 10, provided that the first extendingpart 212 does not touch thecover plate 30, and the shortest distance between the first extendingpart 212 and themain medium 23 is greater than the preset value. When the connectingrib 210 is disposed on the cover plate, the height of the first extendingpart 212 may be adjusted according to actual needs, provided that the first extendingpart 212 does not touch thebottom wall 112, and the shortest distance between the first extendingpart 212 and themain medium 23 is greater than the preset value. - Certainly, a higher height of the first extending
part 212 indicates a larger volume of the connectingrib 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. - In addition, 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 extendingpart 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. Compared with thesupport part 211, the first extendingpart 212 has greater impact on a magnetic field in which themain medium 23 is located. Therefore, the second preset value may be set to be greater than the first preset value. - It should be noted that farther distances between the first extending
part 212 and themain medium 23 and between thesupport part 211 and the main medium 23 indicate that less impact is caused on the magnetic field in which themain medium 23 is located. - Referring to
FIG. 9, FIG. 9 shows adielectric filter 300 according to an embodiment of the present invention. Thedielectric filter 300 provided in the embodiment is similar to thedielectric filter 200. A difference between the two dielectric filters lies in that: In the embodiment, the connectingrib 310 further includes a second extendingpart 312. The second extendingpart 312 is formed by extending, in a direction away from thesupport part 211, a second end that is of thesupport part 211 and that is opposite to the first end. A shortest distance between the second extendingpart 312 and themain medium 23 is greater than the preset value. - In this embodiment, there are at least two connecting
ribs 310, and all the connectingribs 310 are of a concave shape. - When the connecting
rib 310 is disposed on abottom wall 112 or acavity wall 12, a height of the second extendingpart 312 may be adjusted according to actual needs, provided that the second extendingpart 312 does not touch thecover plate 30, and the shortest distance between the second extendingpart 312 and themain medium 23 is greater than the preset value. When the connectingrib 310 is disposed on thecover plate 30, the height of the second extendingpart 312 may be adjusted according to actual needs, provided that the second extendingpart 312 does not touch thebottom wall 112, and the shortest distance between the second extendingpart 312 and themain medium 23 is greater than the preset value. - Certainly, a higher height of the second extending
part 312 indicates a larger volume of the connectingrib 310, and therefore a larger volume of theaccommodating cavity 12 is occupied, resulting in a smaller volume of air in theaccommodating 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. Impact of the shape of the connectingrib 310 on the push-away effect of the high-order harmonic wave is illustrated herein by using an example. A height of thesupport part 211 is 8 mm. The first extendingpart 212 has a same height as that of a top part of thecavity wall 12. The second extendingpart 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 extendingpart 312. - Impact of the height of the connecting
rib 310 on the push-away effect of the high-order harmonic wave is illustrated herein by using an example. There are four connectingribs 310, and the four connectingribs 310 are rectangular and symmetrically arranged on thebottom wall 112 in a cross manner. Heights of the connectingrib 310 are set to 2 mm, 4 mm, and 8 mm respectively. It has been experimentally obtained that frequencies of the high-order harmonic wave are pushed up to 50 MHz, 130 MHz, and 310 MHz respectively by using the connectingribs 310 with heights of 2 mm, 4 mm, and 8 mm. - In addition, in another embodiment, 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 extendingpart 212 and the main medium is greater than a second preset value. The shortest distance between the second extendingpart 312 and themain 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. Compared with thesupport part 211, the first extendingpart 212 has greater impact on a magnetic field in which themain medium 23 is located. Compared with thesupport part 211, the second extendingpart 312 has greater impact on the magnetic field in which themain 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. - It should be noted that farther distances between the first extending
part 212 and themain medium 23, between the second extendingpart 312 and themain medium 23, and between thesupport part 211 and the main medium 23 indicate less impact on the magnetic field in which themain medium 23 is located. - It may be understood that a dielectric filter may also include any dielectric filter in one or more of the foregoing embodiments. For example, when more than one dielectric filters are combined, cavity walls thereof may be connected, and cover plates thereof may also be connected. For a combination manner, refer to an existing manner or a manner emerging in the future, and details are not described herein.
- Referring to
FIG. 10, FIG. 10 shows adielectric filter component 1000 according to a second embodiment of the present invention. Thedielectric 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. - Because a connecting
rib 50 pushes away a high-order harmonic wave of a TE01 mode, a frequency of the high-order harmonic wave of the TE01 mode is increased. The low-pass filter 1100 is cascaded with the dielectric filter, to provide suppression on the high-order harmonic wave of the TE01 mode, so that a better filtering effect is achieved after the dielectric filter is cascaded with the low-pass filter 1100. - Optionally, in order to reduce insertion loss impact of the low-
pass filter 1100 on an overall filter obtained after cascading, in actual application, a cut-off frequency of the low-pass filter needs to keep a specific spacing from a passband frequency of the dielectric filter. For example, 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 connectingrib 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. - In this embodiment, the dielectric filter is the
dielectric filter 100. - The structure and function of the
dielectric filter 100 have been described in detail previously, and therefore details are not described herein again. - In another embodiment, the dielectric filter may also be the another dielectric filter. Referring to
FIG. 11, FIG. 11 shows abase station 2000. Thebase station 2000 includes thedielectric filter 100 or thedielectric filter component 1000 - 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 thedielectric filter 100 The structure and function of thedielectric filter 100 have been described in detail Previously, and therefore details are not described herein again. The dielectric filter may also be the another dielectric filter. - Optionally, the
dielectric filter 100 is also applied to a radio frequency module. Optionally, the radio frequency module may be a radio frequency module in thebase station 2000, or may be a radio frequency module in another communications device, such as in a radar system. - Optionally, the
dielectric filter 100 may also be used for a transceiver, and the like. The transceiver may also be a module in thebase station 2000. - The
base station 2000 includes thedielectric filter component 1000. Thedielectric filter component 1000 includes the low-pass filter 1100 and thedielectric filter 100. Thedielectric filter 100 includes the connectingrib 50. The connectingrib 50 is accommodated in anaccommodating cavity 11. A shortest distance between the connectingrib 50 and amain 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 thedielectric filter 100, the connectingrib 50 affects a path of the magnetic field, resulting in a change in a frequency of the high-order harmonic wave. Further, because the connectingrib 50 is disposed inside theaccommodating cavity 11, a volume of air in theaccommodating 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. Thebase station 2000 of the present invention also maintains performance of the TEoi mode when pushing away the high-order harmonic wave for suppression.
Claims (10)
- A dielectric filter (100), comprising:a cavity (10), wherein the cavity comprises an accommodating cavity (11) and a cavity (10) wall surrounding the accommodating cavity (11);a resonator (20), wherein the resonator (20) is disposed inside the accommodating cavity (11), the resonator (20) comprises 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), and the main medium (23) is disposed on the support medium (22);a cover plate (30), wherein the cover plate (30) covers the cavity (10) to close the accommodating cavity (11); anda connecting rib (50), wherein 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), wherein a shortest distance between the connecting rib (50) and the main medium (23) is greater than a preset value;wherein the connecting rib (50) comprises a support part (211) and a first extending part (212) that is formed by extending a first end of the support part (211) in a direction away from the support part (211), and 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 the preset value; characterized in that the connecting rib (50) further comprises 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, wherein a shortest distance between the second extending part (312) and the main medium (23) is greater than the preset value.
- The dielectric filter (100) according to claim 1, wherein the connecting rib (50) is disposed on at least one of the bottom wall (112) of the accommodating cavity (11), the cover plate (30), or the cavity wall (12) of the accommodating cavity (11).
- The dielectric filter (100) according to claim 2, wherein the dielectric filter (100) further comprises a tuning member, the tuning member is disposed on the cover plate (30), and a center axis (I) of the tuning member is the same as a center axis (I) of the cover plate (30); when the connecting rib (50) is disposed on at least one of the bottom wall (112) of the accommodating cavity (11) or the cavity wall (12) of the accommodating cavity (11), the connecting rib (50) is connected to the support medium (22) via a mounting table (21) and to the cavity wall (12) of the accommodating cavity (11); and when the connecting rib (50) is disposed on the cover plate (30), the connecting rib (50) is connected to the tuning member and the cavity wall (12) of the accommodating cavity (11).
- The dielectric filter (100) according to claim 2 or 3, wherein the radiation plane forms a first projection on the bottom wall (112);
when the connecting rib (50) is disposed on the bottom wall (112) of the accommodating cavity (11), the connecting rib (50) forms a second projection on the bottom wall (112), and the second projection overlaps with the first projection on a center line in a direction from the resonator (20) to the cavity wall (12); and/or,
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), and the third projection overlaps with the first projection on the center line in the direction from the resonator (20) to the cavity wall (12); and/or,
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), and the fourth projection overlaps with the first projection on a center line in a direction from the center axis (I) of the cover plate (30) to the cavity wall (12). - The dielectric filter (100) according to any one of claims 2 to 4, wherein when the connecting rib (50) is disposed on the bottom wall (112) of the accommodating cavity (11), the connecting rib (50) is integrated with the bottom wall (112); and/or
when the connecting rib (50) is disposed on the cavity wall (12) of the accommodating cavity (11), the connecting rib (50) is integrated with the cavity wall (12); and/or
when the connecting rib (50) is disposed on the cover plate (30), the connecting rib (50) is integrated with the cover plate (30). - The dielectric filter (100) according to any one of claims 1 to 5, wherein there are at least two connecting ribs (50); and with the center axis (I) of the resonator (20) as a center line, the at least two connecting ribs (50) are evenly arranged around the center line.
- The dielectric filter (100) according to claims 2 to 6, wherein when connecting ribs (50) are disposed on any two of 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
when connecting ribs (50) are disposed on all the bottom wall (112), the cavity wall (12), and the cover plate (30), 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. - The dielectric filter (100) according to any one of claims 1 to 7, wherein the preset value is 2 mm.
- A dielectric filter component (1000), comprising a low-pass filter and the dielectric filter (100) according to any one of claims 1 to 8, wherein the low-pass filter is cascaded with the dielectric filter (100).
- A base station (2000), comprising the dielectric filter component (1000) according to claim 9.
Applications Claiming Priority (1)
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PCT/CN2015/077805 WO2016172880A1 (en) | 2015-04-29 | 2015-04-29 | Dielectric filter |
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EP3280000A4 EP3280000A4 (en) | 2018-04-11 |
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KR (1) | KR102013056B1 (en) |
CN (1) | CN107112616B (en) |
WO (1) | WO2016172880A1 (en) |
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CN111816971A (en) * | 2020-08-07 | 2020-10-23 | 物广系统有限公司 | Resonance structure for controlling distance of harmonic wave and dielectric filter |
CN117578053B (en) * | 2024-01-17 | 2024-03-29 | 成都宇恒博电子科技有限公司 | Cavity filter for improving out-of-band rejection performance of filter |
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FR2627329B1 (en) * | 1988-02-12 | 1990-03-23 | Alcatel Espace | DIELECTRIC RESONATOR FILTER |
JPH04104501A (en) * | 1990-08-23 | 1992-04-07 | Fujitsu Ltd | Dielectric filter |
IT1264648B1 (en) * | 1993-07-02 | 1996-10-04 | Sits Soc It Telecom Siemens | TUNABLE RESONATOR FOR OSCILLATORS AND MICROWAVE FILTERS |
KR20000026761A (en) * | 1998-10-23 | 2000-05-15 | 구관영 | Variable type notch cable mounted outside having dielectric resonance band pass filter |
DE19921926A1 (en) * | 1999-05-12 | 2000-11-16 | Bosch Gmbh Robert | Dielectric microwave filter has resonator body with two different large base surfaces perpendicular to rotation symmetry axis with connecting lateral surfaces joined along straight lines |
JP3480381B2 (en) * | 1999-08-24 | 2003-12-15 | 株式会社村田製作所 | Dielectric resonator device, dielectric filter, composite dielectric filter device, dielectric duplexer, and communication device |
JP3506076B2 (en) * | 1999-11-24 | 2004-03-15 | 株式会社村田製作所 | Multi-mode dielectric resonator device, filter, duplexer, and communication device |
IT1320543B1 (en) * | 2000-07-20 | 2003-12-10 | Cselt Centro Studi Lab Telecom | DIELECTRICALLY CHARGED CAVITY FOR HIGH FREQUENCY FILTERS. |
US6670867B2 (en) * | 2000-10-26 | 2003-12-30 | Sei-Joo Jang | Dielectric filter for filtering out unwanted higher order frequency harmonics and improving skirt response |
JP3506124B2 (en) * | 2001-02-28 | 2004-03-15 | 株式会社村田製作所 | Filter device, duplexer and communication device for base station |
CN201868545U (en) * | 2010-11-05 | 2011-06-15 | 升达科技股份有限公司 | Higher harmonic suppression device of cavity filter |
CN202217759U (en) * | 2011-08-16 | 2012-05-09 | 武汉凡谷电子技术股份有限公司 | Band elimination filter for inhibiting higher-order modes |
CN202217767U (en) * | 2011-08-16 | 2012-05-09 | 武汉凡谷电子技术股份有限公司 | Low-pass filter with transmission zero |
TW201342002A (en) * | 2011-10-31 | 2013-10-16 | Powermag Llc | Power conditioning and saving device |
KR101307107B1 (en) * | 2011-11-08 | 2013-09-11 | 주식회사 에이스테크놀로지 | Dielectric Resonator Filter |
CN103296372A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Resonance cavity |
CN103872419A (en) * | 2012-12-11 | 2014-06-18 | 中兴通讯股份有限公司 | Medium resonator and assembling method thereof, and medium filter |
CN103633402B (en) * | 2013-12-16 | 2016-08-17 | 华为技术有限公司 | Duplexer and there is the communication system of this duplexer |
CN104037478B (en) * | 2014-05-27 | 2017-06-27 | 京信通信系统(中国)有限公司 | Dielectric filter |
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2015
- 2015-04-29 CN CN201580054116.6A patent/CN107112616B/en active Active
- 2015-04-29 EP EP15890260.1A patent/EP3280000B1/en active Active
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EP3280000A1 (en) | 2018-02-07 |
KR20170139662A (en) | 2017-12-19 |
EP3280000A4 (en) | 2018-04-11 |
KR102013056B1 (en) | 2019-08-21 |
CN107112616B (en) | 2020-01-03 |
WO2016172880A1 (en) | 2016-11-03 |
CN107112616A (en) | 2017-08-29 |
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