EP3217468B1 - Transverse electromagnetic mode dielectric filter, radio frequency module and base station - Google Patents

Transverse electromagnetic mode dielectric filter, radio frequency module and base station Download PDF

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Publication number
EP3217468B1
EP3217468B1 EP15867903.5A EP15867903A EP3217468B1 EP 3217468 B1 EP3217468 B1 EP 3217468B1 EP 15867903 A EP15867903 A EP 15867903A EP 3217468 B1 EP3217468 B1 EP 3217468B1
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EP
European Patent Office
Prior art keywords
filter
dielectric body
resonant
rejection structure
frequency
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EP15867903.5A
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German (de)
English (en)
French (fr)
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EP3217468A1 (en
EP3217468A4 (en
Inventor
Jian Gu
Hui Zhang
Lifang DONG
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of EP3217468A4 publication Critical patent/EP3217468A4/en
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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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a transverse electromagnetic mode dielectric filter, a radio frequency module, and a base station.
  • a wireless communications device With development of wireless communications technologies, a wireless communications device increasingly strives for miniaturization and a low insertion loss. Compared with a conventional metal cavity filter, a dielectric filter has an advantage such as a small size, a low insertion loss, high bearing power, and low costs.
  • a transverse electromagnetic mode (TEM, transverse electromagnetic mode) dielectric filter is an important dielectric filter type, and may be applied to a device such as a wireless base station, a radio frequency terminal, or a radio frequency or microwave transceiver component.
  • a transverse electromagnetic mode dielectric filter provided in the prior art has poor near-end rejection performance, and therefore, cannot be applied to a location, such as a radio frequency front-end or a microwave antenna feeder front-end, that has a relatively high requirement on filter performance. Consequently, an application scenario is limited.
  • RF monoblock filters comprising metallized filter structures on a dielectric lid are known.
  • WO2007/142786 A1 (CTS Corp [US]) ceramic monoblock filters comprising cross-coupling signal means at a top surface of a dielectric body are known.
  • From US 5,537,085 ceramic filters comprising a magnetic coupling on a side surface of a dielectric body are known.
  • Embodiments of the present invention provide a transverse electromagnetic mode dielectric filter that has good near-end rejection performance; and the embodiments of the present invention further provide a radio frequency module and a base station.
  • the present invention provides a transverse electromagnetic mode dielectric filter according to the subject-matter of the present claims.
  • a near-end rejection structure is disposed inside a transverse electromagnetic mode dielectric filter.
  • a transmission zero or zero cavity function is implemented, and a radio frequency signal on a high-frequency end or a low-frequency end out of a passband of the filter is rejected.
  • the transverse electromagnetic mode dielectric filter provided in the embodiments of the present invention has good near-end rejection performance, and may be widely applied to a radio frequency module and a base station.
  • a filter is a necessary component in a device such as a base station or a radio frequency terminal.
  • a dielectric filter may be applied at a location such as a receive link of the base station, and is configured to perform filtering on a radio frequency signal.
  • a transverse electromagnetic mode dielectric filter is a widely-used dielectric filter.
  • a radio frequency performance indicator of the transverse electromagnetic mode dielectric filter is relatively poor, and cannot be used at a location, such as a front-end of a radio frequency module, that is, a location between a transmit antenna and a power amplifier, that has a relatively high requirement on the performance of the filter.
  • the radio frequency performance indicator of the filter includes multiple indicators such as an insertion loss, rejection, and inter-modulation. Therefore, an application scenario of the transverse electromagnetic mode dielectric filter is greatly limited.
  • near-end rejection is also referred to as sideband rejection or near band rejection (near band rejection), and means performing strong rejection on a signal on a high-frequency end or a low-frequency end near an outside area of a passband of the filter, so as to ensure a filtering effect.
  • sideband rejection or near band rejection near band rejection
  • a design method for cross-coupling or resonance of the transverse electromagnetic mode dielectric filter is inflexible, a transmission zero or zero cavity structure cannot be formed effectively, and therefore, the filter does not have good near-end rejection performance.
  • FIG. 1 is a schematic diagram of a transverse electromagnetic mode dielectric filter according to an embodiment of the present invention.
  • a transverse electromagnetic mode dielectric filter 1 (“filter 1" for short below) includes a resonator 11, a dielectric body 12, and a metal housing 13.
  • the metal housing 13 is fastened above the dielectric body 12, and there is a gap between the metal housing 13 and the dielectric body 12.
  • An outer surface of the dielectric body 12 is covered with a conductive material.
  • a metal coating such as a silver coating, may be used.
  • the gap between the metal housing 13 and the dielectric body 12 is filled with air.
  • the resonator 11 includes a resonant plate 101 and a resonant hole 102, and the resonant plate 101 is disposed on a top surface of the dielectric body 12.
  • the resonant plate 101 may be a thin metal piece disposed on the top surface of the dielectric body 12, or may be a metal coating printed on the top surface of the dielectric body 12.
  • a shape of the resonant plate 101 is not limited.
  • the shape may be a regular figure such as a rectangle or a circle, or may be modified on the basis of the regular figure according to specifications and a performance requirement of the filter, for example, a specific area is cut off to form an irregular figure. This is not particularly limited in this embodiment of the present invention.
  • the resonant hole 102 is a hollow cylindrical structure with openings on upper and lower ends, an upper opening of the resonant hole 102 is provided on the resonant plate 101, a lower opening of the resonant hole 102 is provided on a lower surface of the dielectric body 12, and an inner surface of the resonant hole 102 is covered with a conductive material.
  • the conductive material covering the inner surface of the resonant hole 102 may be a metal coating, such as a silver coating.
  • the resonant hole 102 and the resonant plate 101 may be integrally formed, or may be separately made and then formed by means of connection.
  • the filter 1 further includes a near-end rejection structure 14.
  • the near-end rejection structure 14 is inside the dielectric body 12, and a shape, a location, and a size of the near-end rejection structure 14 are determined by a frequency of a signal that the filter is to filter out.
  • the magnetic field area refers to an area that is inside the dielectric body and that has a stronger magnetic field than that of another location.
  • a strong magnetic field area inside the dielectric body 12 is an area near the lower surface of the dielectric body 12.
  • a height, a length, and a distance away from the resonant hole that are of the near-end rejection structure 14 may be determined according to a coupling coefficient (coupling coefficient) of the filter, and the coupling coefficient is corresponding to the frequency of the signal that the filter is to filter out.
  • a coupling coefficient coupling coefficient
  • the coupling coefficient is an important parameter during filter design.
  • a physical structure of the filter may be designed according to the coupling coefficient, and a corresponding performance indicator may be achieved.
  • the coupling coefficient may be obtained by solving a coupling matrix (coupling matrix).
  • the coupling matrix may be used to indicate a coupling energy relationship between resonant cavities, and the coupling coefficient is included in the coupling matrix.
  • the coupling matrix may be obtained by means of calculation by using filter emulation software, or may be determined according to an experimental or empirical value. This is not particularly limited in this embodiment of the present invention.
  • the near-end rejection structure 14 may be any one of a metalized through hole, a metalized strip line, a physical metal structure, a metalized conductor, or a thin metal piece.
  • the near-end rejection structure 14 may be a strip structure with a specific radian.
  • the radian may be determined by means of debugging according to the performance requirement of the filter. This is not particularly limited in this embodiment of the present invention.
  • any other part of the near-end rejection structure 14 may also be in contact with the lower surface of the dielectric body 12, to play a grounding role.
  • the near-end rejection structure 14 plays an inductive transmission zero role, and can improve a rejection capability on a high-frequency end out of a passband of the filter, that is, can reject a signal on the high-frequency end out of the passband of the filter. It may be understood that the near-end rejection structure 14 may be designed for only one specific signal frequency, and when the filter has strong rejection over a specific frequency, the filter has good rejection over a frequency band neighboring to the frequency.
  • the filter 1 may include more than three resonators 11, and the near-end rejection structure 14 is located between nonadjacent resonant cavities. As shown in FIG. 1 , the filter 1 includes four resonators, successively marked as cavity 1, cavity 2, cavity 3, and cavity 4 from left to right. The two ends of the near-end rejection structure 14 are respectively located near the cavity 1 and cavity 3. Optionally, the near-end rejection structure 14 may be located between the cavity 1 and cavity 4, or between the cavity 2 and cavity 4.
  • the near-end rejection structure 14 located between nonadjacent resonant cavities forms a cross-coupling structure, that is, when signals pass through resonant cavities through different signal paths, phases of different signal paths are canceled, so as to form a transmission zero.
  • a signal path of cavity 1-cavity 2-cavity 3 may be considered as a positive phase path, and a signal path of cavity 1-cavity 3 is considered as a negative phase path. Phases of the two paths are canceled, and a transmission zero is formed at the near-end rejection structure 14. The zero is corresponding to the frequency of the signal that the filter is to filter out.
  • a near-end rejection structure is disposed inside the dielectric filter and near a lower surface of the dielectric filter, so as to implement an inductive transmission zero function, and reject a radio frequency signal on a high-frequency end out of a passband of the filter, thereby achieving good near-end rejection performance.
  • FIG. 2 and FIG. 3 are a front view and a top view of another transverse electromagnetic mode dielectric filter according to an embodiment of the present invention.
  • a transverse electromagnetic mode dielectric filter 2 (“filter 2" for short below) includes a resonator 21, a dielectric body 22, a metal housing 23, and a near-end rejection structure 24.
  • the metal housing 23 is fastened above the dielectric body 22, and there is a gap between the metal housing 23 and the dielectric body 22.
  • the resonator 21 includes a resonant plate 211 and a resonant hole 212.
  • the near-end rejection structure 24 is located at an area near a top surface of the dielectric body 22.
  • the area is an electric field area inside the dielectric body 22, and the electric field area refers to an area that is inside the dielectric body and that has a stronger electric field than that of another location.
  • a specific shape, location, and size of the near-end rejection structure 24 may be determined according to a coupling coefficient of the filter. For a specific determining manner, reference may be made to the description in the embodiment shown in FIG. 1 . This is not described herein.
  • the near-end rejection structure 24 plays a capacitive transmission zero role, and can improve a rejection capability on a low-frequency end out of a passband of the filter, that is, can reject a signal on the low-frequency end out of the passband of the filter.
  • a transverse electromagnetic mode dielectric filter whose specification is 90*44*20 (mm, millimeter) is used as an example.
  • a near-end rejection structure is disposed inside a dielectric body of the filter to serve as a capacitive zero.
  • the structure is a metalized through hole whose specific size is as follows: A length is 23 mm, a width is 1 mm, a distance away from a resonant hole is 3 mm, and a distance away from a top surface of the dielectric body, that is, a resonant plate, is 3 mm.
  • a passband of the filter is 1805 MHz to 1865 MHz, that is, a radio frequency signal whose frequency is beyond this frequency band can be effectively filtered out.
  • a near-end rejection structure is disposed inside the dielectric filter and near a top surface of a dielectric body, so as to implement a capacitive transmission zero function, and reject a radio frequency signal on a low-frequency end out of a passband of the filter, thereby achieving good near-end rejection performance.
  • FIG. 4 is a schematic diagram of another transverse electromagnetic mode dielectric filter according to an embodiment of the present invention.
  • a transverse electromagnetic mode dielectric filter 3 (“filter 3" for short below) includes a resonator 31, a dielectric body 32, a metal housing 33, and a near-end rejection structure 34.
  • the metal housing 33 is fastened above the dielectric body 32, there is a gap between the metal housing 33 and the dielectric body 32, and the resonator 31 includes a resonant plate 301 and a resonant hole 302.
  • a wavelength and a frequency of an electromagnetic wave waveform are in a one-to-one correspondence relationship.
  • a height, a length, and a distance away from the resonant hole 302 that are of the near-end rejection structure 34 may be determined according to the electrical wavelength.
  • a size of the near-end rejection structure 34 may be determined by using filter emulation software, or may be determined according to an experiment or experience. This is not particularly limited in this embodiment of the present invention.
  • the near-end rejection structure 34 may be a strip structure with a bending angle, or may be a strip or tube structure with a radian in another embodiment.
  • any other parts of the near-end rejection structure 34 may also be contacted to the lower surface of the dielectric body 32.
  • the near-end rejection structure 34 may play a zero cavity role, and may improve a rejection capability on a high-frequency end or a low-frequency end out of a passband of the filter, that is, may reject a signal on the high-frequency end or the low-frequency end out of the passband of the filter.
  • the electrical wavelength corresponding to the near-end rejection structure 34 may be changed, so as to control the frequency of the signal that the filter is to filter out.
  • the length of the near-end rejection structure 34 is inversely proportional to the signal frequency.
  • a longer near-end rejection structure 34 indicates a lower corresponding signal frequency, and the filter 3 may be configured to filter out a signal on a low-frequency end.
  • a shorter near-end rejection structure 34 indicates a higher corresponding signal frequency, and the filter 3 may be configured to filter out a signal on a high-frequency end.
  • This embodiment of the present invention further provides a radio frequency module.
  • the radio frequency module includes any transverse electromagnetic mode dielectric filter described in the foregoing embodiments.
  • the radio frequency module may be a repeater, a remote radio unit (RRU, remote radio unit), a radio frequency unit (RFU, radio frequency unit), or another device. This is not particularly limited in this embodiment of the present invention.
  • a zero cavity function can be implemented by disposing a near-end rejection structure inside a dielectric body; and by using the structure, a signal on a high-frequency end or a low-frequency end out of a passband of the filter can be rejected, and near-end rejection performance of the filter can be improved, thereby improving a filtering effect.
  • FIG. 5 is an example diagram of a base station according to an embodiment of the present invention.
  • the base station may include a radio frequency module, and the radio frequency module includes the transverse electromagnetic mode dielectric filter shown in any embodiment in FIG. 1 to FIG. 4 .
  • the base station may further include a baseband processing unit (BBU, base band unit) 402, a power module 403, and the like. All modules or units may be connected by using a communications bus.
  • BBU baseband processing unit
  • All modules or units may be connected by using a communications bus.
  • the base station may be a small cell (small cell) device, such as an indoor small cell product.
  • small cell small cell
  • the radio frequency module or the base station provided in this embodiment of the present invention uses a transverse electromagnetic mode dielectric filter with good near-end rejection performance, and therefore has low costs and a small size.
  • An embodiment of the present invention further provides a method for producing any transverse electromagnetic mode dielectric filter ("filter” for short below) according to FIG. 1 to FIG. 4 .
  • the method includes: preparing two layers or multiple layers of dielectric blank raw materials; after a through hole or a blind hole is provided on the two layers or multiple layers of dielectric raw materials, separately sintering each layer of dielectric raw material; preparing a metalized structure and a punching on each layer of sintered dielectric; then forming a filter entirety by means of bonding; and forming the transverse electromagnetic mode dielectric filter provided in this embodiment of the present invention after metallization of a printed pattern of the filter is completed.
  • the method may be: preparing two layers or multiple layers of dielectric blank raw materials; obtaining a required metal structure, that is, a transmission zero or zero cavity structure in the present invention, by means of opening a hole, printing a circuit, and the like on each layer of dielectric raw material; then stacking prepared layers of dielectric raw materials together for sintering; and finally forming the transverse electromagnetic mode dielectric filter provided in this embodiment of the present invention after metallization of a printed pattern of the dielectric filter is completed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP15867903.5A 2014-12-08 2015-07-24 Transverse electromagnetic mode dielectric filter, radio frequency module and base station Active EP3217468B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410743332.9A CN104466315B (zh) 2014-12-08 2014-12-08 横电磁模介质滤波器、射频模块及基站
PCT/CN2015/085087 WO2016090925A1 (zh) 2014-12-08 2015-07-24 横电磁模介质滤波器、射频模块及基站

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EP3217468A1 EP3217468A1 (en) 2017-09-13
EP3217468A4 EP3217468A4 (en) 2017-11-29
EP3217468B1 true EP3217468B1 (en) 2021-01-06

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EP (1) EP3217468B1 (zh)
JP (1) JP2017537581A (zh)
CN (1) CN104466315B (zh)
CA (1) CA2970054C (zh)
WO (1) WO2016090925A1 (zh)

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CN104466315B (zh) * 2014-12-08 2017-11-24 上海华为技术有限公司 横电磁模介质滤波器、射频模块及基站
CN109219904A (zh) * 2016-12-29 2019-01-15 深圳市大富科技股份有限公司 一种tem模滤波器及通信设备
CN107359394B (zh) * 2017-08-15 2020-09-11 罗森伯格技术有限公司 可调电磁混合耦合滤波器
CN108493538B (zh) * 2018-04-11 2024-04-16 广东通宇通讯股份有限公司 一种能调节耦合强度的腔体滤波器
WO2023159482A1 (en) * 2022-02-25 2023-08-31 Telefonaktiebolaget Lm Ericsson (Publ) A communication device
CN115411476B (zh) * 2022-08-19 2023-09-05 北京遥测技术研究所 一种小型化全金属结构的微同轴微波滤波器芯片

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Publication number Publication date
CA2970054C (en) 2019-04-23
CA2970054A1 (en) 2016-06-16
EP3217468A1 (en) 2017-09-13
EP3217468A4 (en) 2017-11-29
WO2016090925A1 (zh) 2016-06-16
CN104466315A (zh) 2015-03-25
JP2017537581A (ja) 2017-12-14
CN104466315B (zh) 2017-11-24

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