WO2019047403A1 - Filtre de station de base 4g cubique sur la base de cavités de résonance moyennes tm010 - Google Patents

Filtre de station de base 4g cubique sur la base de cavités de résonance moyennes tm010 Download PDF

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Publication number
WO2019047403A1
WO2019047403A1 PCT/CN2017/114946 CN2017114946W WO2019047403A1 WO 2019047403 A1 WO2019047403 A1 WO 2019047403A1 CN 2017114946 W CN2017114946 W CN 2017114946W WO 2019047403 A1 WO2019047403 A1 WO 2019047403A1
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filter
dielectric
cavity
dielectric resonator
resonators
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PCT/CN2017/114946
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English (en)
Chinese (zh)
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林福民
曾柳杏
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广东工业大学
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Publication of WO2019047403A1 publication Critical patent/WO2019047403A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure

Definitions

  • the present invention relates to the field of radar communications, and more particularly to a cube 4G base station filter based on a TM 010 dielectric resonator.
  • 4G base station filters have also been widely used. Since the 4G base station filter requires high out-of-band rejection, a high-Q resonance unit is required, that is, the resonance unit required for filtering has a high quality factor, and usually the quality factor value needs tens of thousands, so most of the current stage
  • the resonant units used in the base station are TE 01 ⁇ mode cylindrical dielectric resonators, and the dielectric columns in the TE 01 ⁇ mode cylindrical dielectric resonators need to have a high dielectric constant.
  • FIG. 1 is a plan view of the prior art TE 01 ⁇ mode cylindrical dielectric resonator
  • FIG. 2 is a prior art cylindrical TE 01 ⁇ mode dielectric resonator is a front view
  • FIG. 3 is a current Schematic diagram of the structure of the TE 01 ⁇ mode cylindrical dielectric resonator in the prior art.
  • the resonant cavity used is a TE mode resonant cavity, wherein the waveform of the propagated signal is a transverse electric wave.
  • the electric field has no component along the propagation direction of the wave, and only a component perpendicular to the propagation direction of the wave;
  • the magnetic field has a component in the magnetic field along the direction of propagation of the wave.
  • a material 2 having a low dielectric constant placed under the dielectric column 1 is used to pad the dielectric column 1.
  • the volume of the TE 01 ⁇ mode cylindrical dielectric resonator used in the prior art is usually large, and a plurality of the TE 01 ⁇ mode cylindrical dielectric resonators are usually disposed in a plurality of base station filters to couple with each other, and the 4G signals are coupled to each other. Filtering is performed, and the volume of the entire filter is usually large at this time, which is disadvantageous for miniaturization of the base station.
  • the dielectric resonator generally selects a planar layout, which is disadvantageous for the shape of the base station filter.
  • the present invention provides a cube 4G base station filter based on a TM 010 dielectric resonator, the filter comprising a plurality of TM 010 dielectric resonators, the TM 010 dielectric resonator comprising a hollow cylindrical cavity And a cylindrical dielectric column cooperating with the cavity, the dielectric column being vertically disposed inside the cavity and in contact with the upper and lower cavity walls of the cavity; a plurality of adjacent TMs An air window is disposed between the 010 dielectric resonators, and the plurality of TM 010 dielectric resonators have a three-dimensional layout; the first TM 010 dielectric resonator is connected with a filter input tap along the electromagnetic wave propagation direction, and the last one is TM The 010 dielectric resonator is connected to the filter output tap.
  • the filter includes eight TM 010 dielectric resonators, and the TM 010 dielectric resonators are respectively provided with two TM 010 dielectric resonators in a lateral direction, a longitudinal direction, and a height direction.
  • the air window is disposed between two adjacent TM 010 dielectric resonators in the horizontal direction, and a pair of adjacent two TM 010 dielectric resonators in the vertical direction The air window is provided between.
  • the filter input and the filter output taps are connected to any tap is not provided with a window air dielectric resonators of TM 010 in the vertical direction, the dielectric resonator is connected TM 010 tap filter input
  • the cavity and the TM 010 dielectric resonator connected to the filter output tap are distributed along the body diagonal of the filter.
  • the filter includes a flying rod, and the flying rod is connected to two TM 010 dielectric resonators distributed diagonally in a horizontal direction by a clamp; wherein one end of the flying rod and the filtering The input taps are connected to the same TM 010 dielectric resonator.
  • the filter includes a coupling ring connecting two TM 010 dielectric resonators distributed diagonally in a horizontal direction; wherein one end of the coupling loop and the filter output The tap is connected to the same TM 010 dielectric resonator.
  • the upper and lower surfaces of the dielectric column and the upper surface of the air window are respectively provided with tuning screws.
  • the upper and lower surfaces of the dielectric column are provided with circular deep holes that cooperate with the tuning screw.
  • the present invention provides a cube 4G base station filter based on a TM 010 dielectric resonator, which can filter a signal input through a filter input tap by using a plurality of TM 010 dielectric resonators; TM 010 dielectric resonator and TE 01 ⁇
  • the quality factor of the cavity of the cylindrical cavity can also reach tens of thousands to meet the filtering requirements of the filter.
  • the size and volume of the TM 010 dielectric resonator are smaller, which is beneficial to reduce the volume of the filter, thereby miniaturizing the base station;
  • the TM 010 dielectric resonators form a filter in a three-dimensional layout, which allows more adjacent resonators to be coupled to each cavity, thereby improving the filtering performance to meet the requirements of the 4G base station filter, and also enabling the base station.
  • the shape of the filter is varied.
  • FIG. 1 is a top plan view of a TE 01 ⁇ mode cylindrical dielectric resonator in the prior art
  • FIG. 2 is a front view of a TE 01 ⁇ mode cylindrical dielectric resonator in the prior art
  • FIG. 3 is a schematic structural view of a TE 01 ⁇ mode cylindrical dielectric resonator in the prior art
  • FIG. 4 is a top plan view of a TM 010 dielectric resonator in a filter according to an embodiment of the present invention
  • FIG. 5 is a front elevational view of a TM 010 dielectric resonator in a filter according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a TM 010 dielectric resonator in a filter according to an embodiment of the present invention
  • FIG. 7 is a topological structural diagram of a filter according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a filter according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram showing a result of comprehensive analysis of insertion loss and return loss of a filter according to an embodiment of the present invention.
  • FIG. 10 is a three-dimensional simulation result diagram of insertion loss and return loss of a filter according to an embodiment of the present invention.
  • the core of the invention is to provide a cube 4G base station filter based on a TM 010 dielectric resonator.
  • the 4G base station filter usually filters the input signal through a plurality of TE 01 ⁇ mode cylindrical dielectric resonators, and since the volume of the TE 01 ⁇ mode cylindrical dielectric resonator is generally large, this inevitably makes the whole
  • the volume of the filter is relatively large; and in the prior art, each cavity in the filter is usually in a planar layout, that is, each cavity is distributed on the same plane, which inevitably makes the cross-sectional area of the entire filter Larger, the entire filter structure is not compact enough.
  • the cube 4G base station filter based on the TM 010 dielectric resonator provided by the present invention can filter the signal input through the filter input tap 201 by using a plurality of TM 010 dielectric resonators 100; TM 010 dielectric resonator
  • the quality factor of 100 and TE 01 ⁇ mode cylindrical dielectric resonator can reach tens of thousands to meet the filtering requirements of the filter, but the size and volume of TM 010 dielectric resonator 100 is smaller, which helps to reduce the volume of the filter, thus making
  • the base station is miniaturized; a plurality of TM 010 dielectric resonators 100 form a filter in a three-dimensional layout, so that each cavity has more adjacent resonators coupled thereto, thereby improving the filtering performance to meet the requirements of the 4G base station filter.
  • the shape of the base station filter can be diversified.
  • FIG. 4 is a top view of a TM 010 dielectric resonator in a filter according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a filter in an embodiment of the present invention.
  • FIG. 6 is a schematic structural view of a TM 010 dielectric resonator in a filter according to an embodiment of the present invention.
  • the filter comprises a plurality of TM 010 dielectric resonators 100, the TM 010 dielectric resonator 100 comprising a hollow cylindrical cavity 101 and a cylindrical dielectric column 102 cooperating with the cavity 101
  • the dielectric column 102 is vertically disposed inside the cavity 101 and is in contact with the upper and lower cavity walls of the cavity 101.
  • the resonant cavity used by the filter is a TM 010 dielectric resonator 100, which is a TM mode cavity, wherein the waveform of the propagated signal is a transverse magnetic wave, as shown in FIG. It is shown that the magnetic field has no component along the direction of propagation of the wave, and only has a component perpendicular to the direction of propagation of the wave; as shown in FIG. 5, in the direction of propagation of the wave, the electric field has a component, and the electric field is mainly concentrated in the set at the TM 010
  • the dielectric resonator 102 is surrounded by a dielectric column 102.
  • the TM 010 dielectric resonator 100 used is a cylindrical resonant cavity, wherein TM 010 represents a transverse magnetic resonance mode, and 0 in the first position indicates that the electromagnetic field is uniformly distributed in the circumferential direction; 1 indicates that there is only one amplitude in the radial direction of the cylinder, and the amplitude is usually at the center of the dielectric column 102; 0 in the third position indicates that the electromagnetic field is evenly distributed along the axial direction of the cylinder.
  • the fundamental mode of the resonant cavity used in the embodiment of the present invention is the TM 010 mode
  • the mode is very pure, and the frequency interval from the adjacent higher-order modes is about 1 GHz, which can effectively avoid the interference caused by the high-order mode.
  • the TM 010 dielectric resonator 100 includes a hollow cylindrical cavity 101 and a cylindrical dielectric column 102 cooperating with the cavity 101.
  • the dielectric column 102 needs to be high.
  • the dielectric constant material is usually made of a ceramic material with a high dielectric constant.
  • the cavity 101 is usually made of a common metal material, such as copper, iron or the like.
  • the cavity 101 is generally a closed cavity having an upper wall, a lower wall and a side wall, and electromagnetic waves need to be confined in the cavity 101 when the average electric energy of the electric field in the electromagnetic wave and the average magnetic energy of the magnetic field are equal.
  • Resonance occurs, and the frequency of the electromagnetic wave is the resonant frequency when the resonance occurs.
  • the resonant cavity is filtered by the resonance of the electromagnetic wave, and the frequency is also the operating frequency of the filter.
  • the radius of the dielectric column 102 described above is typically much smaller than the radius of the cavity 101 because space is required in the cavity to cause electromagnetic waves to resonate.
  • the dielectric column 102 is vertically disposed inside the cavity 101 and is in contact with the upper and lower cavity walls of the cavity 101, that is, the height of the dielectric column 102 needs to be equal to the height of the cavity 101;
  • the media column 102 is disposed at a central location within the inner cavity.
  • the middle of the dielectric column 102 is a hollow passage for the purpose of providing a tuning screw 500 that can adjust the resonant frequency of the resonant cavity.
  • a tuning screw 500 that can adjust the resonant frequency of the resonant cavity.
  • two corresponding grooves are provided at the upper and lower ends of the dielectric column 102 to cooperate with the tuning screw 500, that is, the upper and lower ends of the channel are hollow at one end, and There is a solid part in the middle. Details of the tuning screw 500 will be described in detail in subsequent sections.
  • the filter provided by the present invention is to be applied in a 4G base station, the working frequency band of the filter is required to be in the range of 2570 MHz to 2620 MHz, and the passband insertion loss needs to be greater than -0.7 dB, and the outband is reduced by 40 dB in 5 M. Inhibition, the Q value of the TM 010 dielectric resonator 100 is required to be sufficiently large, at least greater than 12,000.
  • the height of the cavity 101 of the TM 010 dielectric resonator 100 is 15 mm, and the radius of the cross section of the cavity 101 is 15 mm; correspondingly, the cavity is disposed inside the cavity
  • the height of the dielectric column 102 is also 15 mm, the radius of the cross section of the dielectric column 102 is 4 mm, and the dielectric material used for the dielectric column 102 needs to have a dielectric constant of 35 and a loss tangent of 0.0002.
  • the resonant frequency of the TM 010 dielectric resonator 100 reaches 2585 MHz, and the quality factor Q reaches 14000, which satisfies the above-mentioned design requirements for the resonant cavity.
  • a tuning screw 500 is separately disposed on the upper and lower surfaces of the dielectric column 102, and the resonant frequency of the entire resonant cavity is adjusted by the tuning screw 500 to compensate for engineering errors; correspondingly, it is required at the upper and lower ends of the dielectric column 102.
  • Deep holes are provided respectively for mating with the tuning screw 500, which is typically disposed at the center of the end of the dielectric column 102, the radius of the deep hole is typically 3 mm, and the depth of the deep hole is typically 5 mm. If the deep holes provided at the upper and lower ends of the same dielectric column 102 are connected to form a channel, the radius of the channel is 3 mm.
  • an air window is disposed between the plurality of adjacent TM 010 dielectric resonators 100, and the plurality of TM 010 dielectric resonators 100 have a three-dimensional layout; the first one is along the electromagnetic wave propagation direction.
  • the TM 010 dielectric resonator 100 is connected to a filter input tap 201, and the last TM 010 dielectric resonator 100 is connected to a filter output tap 202.
  • the filter is connected to the external microwave system through the filter input tap 201 and the filter output tap 202, and the signal to be filtered is input through the filter input tap 201, after filtering by the filter provided by the present invention, The filtered signal is input through the filter output tap 202 to an external microwave system.
  • a plurality of the TM 010 dielectric resonators 100 have a three-dimensional layout, which can make the structure of the whole filter more compact and can also make the shape of the base station filter compared to the prior art planar layout. diversification.
  • the specific three-dimensional layout of the filter will be described in detail in the following embodiments.
  • the present invention provides a cube 4G base station filter based on a TM 010 dielectric resonator, which can filter a signal input through the filter input tap 201 by using a plurality of TM 010 dielectric resonators 100; TM 010 dielectric resonator 100
  • the quality factor of the TE 01 ⁇ mode cylindrical dielectric cavity can reach tens of thousands to meet the filtering requirements of the filter.
  • the size and volume of the TM 010 dielectric resonator are smaller, which is beneficial to reduce the volume of the filter, thus making the base station small.
  • TM 010 dielectric resonators form a filter in a three-dimensional layout, allowing each adjacent cavity to have more adjacent resonators coupled to it, thereby improving filtering performance to meet the requirements of 4G base station filters, and
  • the shape of the base station filter can be diversified.
  • FIG. 7 is a schematic structural diagram of a filter according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a filter according to an embodiment of the present invention
  • FIG. 9 is a diagram showing insertion loss and return loss of a filter according to an embodiment of the present invention
  • FIG. 10 is a three-dimensional simulation result diagram of insertion loss and return loss of a filter according to an embodiment of the present invention.
  • the filter provided by the present invention comprises eight of the TM 010 dielectric resonators 100, and the eight TM 010 dielectric resonators 100 are respectively provided with two in the lateral direction, the longitudinal direction and the height direction.
  • the TM 010 dielectric resonator 100 is configured to form a cubic-like structure. That is, in the embodiment of the present invention, the eight TM 010 dielectric resonators 100 are arranged in two layers to form a 2 ⁇ 2 ⁇ 2 cubic-like structure.
  • S represents the filter input tap 201;
  • the filter output tap 202 is represented.
  • an air window is disposed between two adjacent TM 010 dielectric resonators 100 in the horizontal direction, and a pair of adjacent two TM 010 dielectric resonators 100 in the vertical direction There is an air window between them.
  • the air window is a hollow passage, and the air window is connected to any two adjacent TM 010 dielectric resonators 100 in the horizontal direction, which is equivalent to opening a window on the sidewall of the TM 010 dielectric resonator 100.
  • the air window connects the space between the two resonant cavities so that electromagnetic waves distributed in the two resonant cavities can be coupled through the air window.
  • the electromagnetic waves in the TM 010 dielectric resonator 100 are transverse magnetic waves. Therefore, in the embodiment of the present invention, the adjacent two TM 010 dielectric resonators 100 are transmitted by magnetic coupling.
  • adjacent TM 010 dielectric resonators 100 disposed in the same layer are magnetically coupled through an air window, and a pair of upper and lower adjacent TM 010 dielectric resonators 100 are also The magnetic coupling is performed through the air window, and the coupling mode is equivalent to inductive coupling. Therefore, in the topology diagram of FIG. 7, each TM010 dielectric resonator 100 is connected by an inductor, and each TM 010 dielectric resonator 100 connected through an inductor is connected.
  • the air window is provided for magnetic coupling.
  • the filter input tap 201 is disposed in the No. 1 TM 010 dielectric resonator
  • the filter output tap 202 is disposed in the No. 8 TM 010 dielectric resonator
  • the filter input taps 201 and 1 are provided.
  • the TM 010 dielectric resonators and between the filter output taps 202 and the No. 8 TM 010 dielectric resonators they are transmitted by magnetic coupling, so in Figure 7, the input taps are also connected through the inductive connection filter.
  • the filter input tap 201 and the filter output tap 202 are respectively connected to any TM 010 dielectric resonator 100 in which no air window is disposed in the vertical direction, and the filter input tap 201 is connected.
  • the TM 010 dielectric resonators 100 and 202 connected to output taps of the filter medium TM 010 resonator filter body 100 along the diagonal distribution. That is, in FIG. 7, only the No. 5 TM 010 dielectric resonator and the No. 4 TM 010 dielectric resonator are connected to each other through the inductor in the vertical direction, and the filter input tap S is connected to the No. 1 TM 010 dielectric resonator, and the filter is filtered.
  • the output tap L is connected to the No. 8 TM 010 dielectric resonator.
  • the filter includes a flying rod 300, and the flying rod 300 is connected to two TM 010 dielectric resonators 100 distributed diagonally in a horizontal direction by a clamp; wherein, the flying rod 300 One end of the TM 010 dielectric resonator 100 is connected to the filter input tap 201 at one end.
  • the flying rod 300 Since the flying rod 300 is not in direct contact with the two TM 010 dielectric resonators 100, but is isolated by the clamp, the flying rod 300 and the two TM 010 dielectric resonators 100 are electrically coupled. form of a transmission signal, which corresponds to the coupling capacitive coupling, so in FIG. 7, No. 1 interconnected between the dielectric resonator and the TM 010 No. 3 TM 010 via a capacitor dielectric resonators.
  • the above fixture is usually a fixture made of Teflon, and the Teflon material has a dielectric constant of 2.1, which effectively isolates the flying rod 300 from the TM 010 dielectric cavity 100, thereby making the flying rod 300 and the TM 010 medium.
  • the resonant cavity 100 is electrically coupled to eventually form a capacitor. After the flying rod 300 is added, two zero points can be generated in the low frequency band of the pass band.
  • the filter includes a coupling ring 400 connected to two TM 010 dielectric resonators 100 distributed diagonally in the horizontal direction; wherein one end of the coupling ring 400 is The filter output tap 202 is coupled to the same TM 010 dielectric resonator 100.
  • a coupling ring 400 is added between the No. 6 TM 010 dielectric resonator and the No. 8 TM 010 dielectric resonator, and the coupling ring 400 is in direct contact with the metal wall of the cavity to form a closed ring with the metal wall, which can enhance non-adjacent
  • the inductive coupling between the TM 010 dielectric resonators 100 in turn, produces two transmission zeros in the high frequency band of the passband.
  • a tuning screw 500 may be disposed on the upper surface of each air window, and the coupling coefficient between the TM 010 dielectric resonators 100 may be adjusted by the tuning screw 500 disposed in the air window.
  • the filter is provided with a total of 8 TM 010 dielectric resonators 100, and the 8 TM 010 dielectric resonators 100 are arranged in a 2 ⁇ 2 ⁇ 2 cubic-like structure, and each TM 010 dielectric resonator
  • the cavity 101 of the 100 has a radius of 15 mm and a height of 15 mm.
  • the wall thickness of the cavity 101 is generally 4 mm to 5 mm, and the resulting filter has an outer dimension of 74 mm ⁇ 74 mm ⁇ 40 mm;
  • the volume of the filter is 217 mm ⁇ 74 mm ⁇ 28 mm, and the volume of the filter provided by the embodiment of the present invention is less than half the volume of the filter provided in the prior art.
  • only one flying rod 300 and one coupling ring 400 are provided, which is very convenient for processing and manufacturing of the filter.
  • FIG. 9 and FIG. 10 show that the operating frequency of the cube 4G base station filter of the TM 010 dielectric resonator provided by the embodiment of the present invention is 2570 MHz to 2620 MHz ( ⁇ 0.5 MHz), and the operating frequency is 4G. Communication frequency band; return loss is less than -20dB, insertion loss is greater than -1dB, out-of-band rejection is less than -40dB from 2500MHz to 2565MHz and 2625MHz to 2695MHz, and less than 60dB in 1880MHz to 1920MHz (mobile 3G communication band).
  • a cube 4G base station filter based on a TM 010 dielectric resonator provided by an embodiment of the present invention adopts a three-dimensional layout between a plurality of resonant cavities, so that the structure of the whole filter is more compact, and the base station can also be filtered.
  • the shape of the device is varied.
  • the filter is very good in terms of return loss, insertion loss and out-of-band rejection, and can fully meet the requirements of 4G base station filter.

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Abstract

L'invention concerne un filtre de station de base 4G cubique sur la base de cavités de résonance moyennes TM010, un signal entrant par une languette d'entrée du filtre pouvant être filtré au moyen d'une pluralité de cavités de résonance moyennes TM010 ; des facteurs de qualité d'une cavité de résonance moyenne TM010, comme des facteurs de qualité d'une cavité de résonance moyenne cylindrique en mode TE01δ, peuvent dépasser dix mille, afin de satisfaire aux exigences de filtrage du filtre ; cependant, la taille et le volume de la cavité de résonance moyenne TM010 est relativement petite, facilitant la réduction de volume du filtre, et miniaturisant ainsi une station de base ; et la pluralité de cavités de résonance moyennes TM010 sont disposées de manière stéréoscopique pour former le filtre, permettant ainsi que chaque cavité de résonance ait plus de cavités de résonance adjacentes avec lesquelles être couplée, afin d'améliorer la performance de filtrage pour satisfaire aux exigences du filtre de station de base 4G, et aussi diversifier les formes des filtres de stations de base.
PCT/CN2017/114946 2017-09-06 2017-12-07 Filtre de station de base 4g cubique sur la base de cavités de résonance moyennes tm010 WO2019047403A1 (fr)

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CN201710795938.0A CN107579319B (zh) 2017-09-06 2017-09-06 一种基于tm010介质谐振腔的立方体4g基站滤波器

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