CN114188684A - Small medium loading filter with wide stop band - Google Patents
Small medium loading filter with wide stop band Download PDFInfo
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- CN114188684A CN114188684A CN202111615903.7A CN202111615903A CN114188684A CN 114188684 A CN114188684 A CN 114188684A CN 202111615903 A CN202111615903 A CN 202111615903A CN 114188684 A CN114188684 A CN 114188684A
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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
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
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Abstract
The invention discloses a small medium loading filter with wide stop band, comprising: a first resonant cavity, a second resonant cavity, and a coupling window. The first resonant cavity and the second resonant cavity respectively comprise: the device comprises a metal four-pie loading resonant rod, a first medium substrate, a second medium substrate, a third medium substrate and a supporting medium. The invention not only realizes the miniaturization of the size and the wide stop band characteristic, but also realizes the tuning and the low cost of the whole dielectric loading filter. Meanwhile, the high power capacity is also the beneficial effect of the filter, in a word, the filter can meet the design requirement of a small-sized communication system, and can be applied to microwave electronic systems such as mobile communication, radar, satellite and the like.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a small medium loading filter with a wide stop band.
Background
FR1 frequency band, namely Sub-6-GHz frequency band, is mainly adopted in 5G mobile communication in China. The Sub-6-GHz frequency band comprises frequency spectrums of 2G, 3G and 4G which are used in the existing network, and the frequency spectrums have the advantages of strong diffraction capability and wide coverage range, and the large population base number in China enables the Sub-6-GHz with large coverage area to become the main frequency spectrum of 5G communication in China. This low band application has led to the development of Sub-6-GHz filters towards miniaturized dielectric filters. In 5G network construction, the number of Chinese 5G base stations reaches 60 ten thousand stations, and the Chinese 5G base stations is expected to reach 300 thousand stations by 2023. Currently, 192 filters are needed for a 5G base station, which makes the total amount of filter requirements very large. Therefore, the miniaturized dielectric filter has wide market prospect.
The existing dielectric filters are all realized by dielectric resonators, but the dielectric resonators have the problems of harmonic wave, tuning, high cost (particularly, the dielectric resonators with special shapes have high processing difficulty and high die sinking cost), size and the like. This results in serious harmonic interference, difficult tuning, high cost, and insufficient miniaturization of the present dielectric filter using the dielectric resonator. It is therefore a great challenge to design a small dielectric filter with a wide stopband, which is tunable and low cost.
Disclosure of Invention
The present invention is directed to a small dielectric loaded filter with a wide stop band, which overcomes the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problem is to construct a small medium loading filter with a wide stop band, which comprises the following steps: a first resonant cavity, a second resonant cavity and a coupling window; the small medium loading filter with the wide stop band is symmetrical about the central plane of the coupling window; the inner cavities of the first resonant cavity and the second resonant cavity are both mirror symmetry structures with upper hollowed cylinders and lower hollowed cuboids;
the first resonant cavity and the second resonant cavity respectively comprise: the device comprises a metal four-pie loading resonance rod, a first medium substrate, a second medium substrate, a third medium substrate and a supporting medium; the metal four-wafer loading resonance rod is a resonance structure of the small medium loading filter with the wide stop band and is used for generating a resonance mode; the first dielectric substrate, the second dielectric substrate and the third dielectric substrate have the same structure and are nested among the four metal wafers of the metal four-wafer loading resonance rod, and the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are used for controlling the resonance frequency of a resonance mode; the coupling window is a coupling structure of the small medium loading filter with the wide stop band and is used for controlling the coupling coefficient of the pass band; the top end of the metal four-wafer loading resonant rod is open-circuited, and the bottom end of the metal four-wafer loading resonant rod is connected with the bottom end of the resonant cavity.
In the small medium loading filter with the wide stop band, the metal four-wafer loading resonance rod is formed by loading four metal wafers with the same size on the same metal cylindrical rod, and the bottom end of the metal cylindrical rod is welded on the bottom surface of the first resonance cavity.
In the wide stopband small dielectric loaded filter, the filter further comprises a first metal tuning disk, a second metal tuning disk and an adjusting screw, wherein the first metal tuning disk passes through the first resonant cavity, the second metal tuning disk passes through the second resonant cavity, and the heights of the first metal tuning disk and the second metal tuning disk are adjustable through the adjusting screw.
In the small medium loading filter with the wide stop band, the coupling window comprises a window structure, the size of the window structure controls the coupling coefficient of the pass band, the center of the coupling window is penetrated through by the adjusting screw, and the adjustment of the coupling coefficient between the first resonant cavity and the second resonant cavity is realized by adjusting the depth of the adjusting screw.
In the small medium loading filter with the wide stop band, the first medium substrate, the second medium substrate and the third medium substrate are all in a circular ring structure with a hole, and a metal cylindrical rod of the metal four-wafer loading resonance rod penetrates through the hole to realize nesting.
In the wide stopband small dielectric loaded filter of the present invention, the filter further includes an input port and an output port respectively opened at the input side of the first resonant cavity and the output side of the second resonant cavity.
In the small dielectric loaded filter with the wide stop band, the small dielectric loaded filter further comprises a tapped feeder, wherein the tapped feeder is a coaxial inner conductor extension line of the input port, and the input port sends an input signal to the metal four-wafer loaded resonant rod through the tapped feeder; the height of the tapped feed line controls the external quality factor of the passband.
In the small dielectric loaded filter with the wide stop band, a hole is formed in the supporting medium at the feeding position, and the tapped feeder penetrates through the hole of the supporting medium and is welded below the resonant rod of the metal four-wafer loading resonant rod.
In the small dielectric loaded filter with the wide stop band, the size miniaturization and the wide stop band characteristic are realized, and the tuning and the low cost of the whole dielectric loaded filter are realized. Meanwhile, the high power capacity is also the beneficial effect of the filter, in a word, the filter can meet the design requirement of a small-sized communication system, and can be applied to microwave electronic systems such as mobile communication, radar, satellite and the like.
Drawings
FIG. 1 is a 3-dimensional view of a proposed wide stopband compact dielectrically loaded filter according to the invention;
fig. 2(a) is a 3-dimensional view of a first resonator cavity according to the present invention;
fig. 2(b) is a front view of a first resonator cavity proposed according to the present invention;
fig. 2(c) is a top view of a first resonant cavity proposed according to the present invention;
FIG. 3 is an internal assembly view of a first resonant cavity according to the present invention;
FIG. 4 is a graph of resonant frequencies of first two resonant modes of a first resonant cavity as a function of the number n of dielectric substrate loading slices, according to the present invention;
FIG. 5 shows the resonant frequencies of the first two resonant modes of the first resonant cavity according to the present invention as a function of the diameter of the loaded metal wafer
A variation graph of (2);
fig. 6 is a view illustrating a structure of a coupling window according to the present invention;
fig. 7 is a graph showing simulation results of transmission response of a compact dielectric loaded filter with a wide stop band according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to realize a small medium loading filter with a wide stop band, the invention adopts a multi-wafer loading structure and a multi-layer medium substrate loading technology, and the specific design principle is as follows:
1. and (3) realizing a principle of wide stop band.
The structure of the small dielectric loaded filter with wide stop band proposed by the present invention is shown in fig. 1. The structure of the first resonant cavity proposed by the present invention is shown in fig. 2(a), fig. 2(b) and fig. 2 (c). The resonator with resonance function in the resonant cavity is a four-wafer loading resonant rod, the top end of the resonant rod is open-circuited, the bottom end of the resonant rod is connected with the bottom end of the metal cavity, the resonator is equivalent to a short-circuit resonator, and the short-circuit resonator only has odd-order modes such as a basic mode, a third-order mode, a fifth-order mode and the like, but does not have even-order modes such as a second-order mode, a fourth-order mode and the like, so that the resonator has natural wide stop band characteristics. And the four loaded metal pie pieces close to the open end can be equivalent to a step impedance structure, so that the structure can increase the frequency ratio of the third mode and the fundamental mode of the resonator.
2. Principle for realizing miniaturization by combining multi-wafer loading with multi-medium substrate loading technology
The internal assembly diagram of the first resonant cavity provided by the invention is shown in fig. 3, three circular ring-shaped medium substrates are nested between four metal wafers of a metal four-wafer loading resonant rod, for convenience of processing, the uppermost wafer and the resonant rod in the four metal wafers are integrally processed, other three wafers are processed into a circular ring structure for convenience of assembly, and finally a supporting medium is sleeved below the metal four-wafer loading resonant rod for realizing the functions of supporting the medium substrates and the metal circular rings, as shown in fig. 4, the resonant frequency of the first two resonant modes (a basic mode and a third mode) of the first resonant cavity is reduced along with the loading of the metal wafers, and after the medium substrates are loaded, the resonant frequency is further reduced. Since the resonance frequency and the size are inversely proportional, the decrease of the resonance frequency means that the miniaturization of the resonant cavity is achieved without changing the size of the outer cavity, as shown in fig. 5, the resonance frequency of the first two resonance modes of the first resonant cavity follows the diameter of the loaded metal cake
Is decreased, this parameter is mainly used to precisely control the center frequency of the filter.
The present invention aims to overcome the disadvantages of the prior art, which is difficult to realize a wide stop band dielectric filter with extremely small size. By adopting the multi-wafer loading combination and multi-medium substrate loading technology, the dielectric loading filter with compact structure, small volume, low cost, high power capacity and wide stop band is provided. The filter can meet the design requirements of miniaturization and high power capacity, can be applied to microwave electronic systems such as base stations, radars, remote sensing and the like in mobile communication, and is particularly suitable for 5G networks with 700M frequency. In order to achieve the purpose, the technical scheme provided by the invention is as follows: by adopting multi-wafer loading combination and multi-medium substrate loading technology, the filtering characteristics of small size, wide stop band, controllable center frequency and controllable bandwidth are realized.
The invention not only realizes the filter with small size, wide stop band, controllable central frequency and bandwidth, but also has the advantages of high power capacity and simple design and processing, and the filter is a novel scheme integrating the advantages of a dielectric filter and a coaxial cavity filter and can be applied to microwave electronic systems such as mobile communication, radar, satellite and the like.
The present invention is further described with reference to specific examples, which are intended to be illustrative only and are not intended to be limiting.
For clarity of description of the present invention, fig. 1 is a 3-dimensional view of a small dielectric loaded filter with wide stop band, which is proposed by the present invention, and the small dielectric loaded filter with wide stop band comprises: the device comprises a first resonant cavity 1, a second resonant cavity 2, an input port 3, an output port 4, a coupling window 5, a first metal tuning disc 6, a second metal tuning disc 7 and a metal tuning coupling screw 8.
The inner cavities of the first resonant cavity 1 and the second resonant cavity 2 are both of structures with upper hollowed cylinders and lower hollowed cuboids, the outer cavities are of cubic structures, the first resonant cavity 1 and the second resonant cavity 2 are separated by a coupling window 5, an input port 3 and an output port 4 are respectively arranged on the input side of the first resonant cavity 1 and the output side of the second resonant cavity 2, and the whole filter structure is symmetrical about the central plane of the coupling window 5.
Further, fig. 2(a) and fig. 2(b) are internal structural diagrams of a first resonant cavity 1 according to the present invention, where the first resonant cavity 1 includes: the feed line 1a of taking out the tap, four cake piece loading resonance rods 1b of metal, first dielectric substrate 1c, second dielectric substrate 1d, third dielectric substrate 1e, supporting medium 1 f.
Further, the assembly condition inside the first resonant cavity 1 is as shown in fig. 3, the first dielectric substrate 1c, the second dielectric substrate 1d and the third dielectric substrate 1e are uniformly embedded in four metal wafers of the metal four-wafer loading resonant rod 1b, the supporting medium 1f is located between the lowermost metal wafer and the cavity bottom and is used for supporting the resonant rod and the dielectric substrate, and it is noted that the supporting medium 1f is provided with a hole at the feeding position and is used for feeding the tapped feeder 1 a.
Further, metal screws penetrate through the respective cavities and are in contact with the first metal tuning disk 6 and the second metal tuning disk 7, and the heights of the metal tuning disks are adjusted by rotating the screws above, so that the adjustment of the resonant frequency in the cavities is realized.
Further, the tapped feeder 1a is a coaxial inner conductor extension line of the input port 3, the tapped feeder 1a penetrates through a hole of the supporting medium 1f and is welded below a resonant rod of the metal four-pie loading resonant rod 1b, and the welding height of the tapped feeder controls the external quality factor of the pass band.
Further, the structure of the coupling window 5 is shown in fig. 6, the coupling window is a structure with a window below, the size of the window controls the resonant frequency of the pass band, the center of the coupling window 5 is penetrated by the metal tuning coupling screw 8, and the depth of the coupling window is adjusted by rotating the metal tuning coupling screw 8 to achieve adjustment of the coupling coefficient between the two cavities.
The second cavity 2 has the same structure as the first cavity 1, and will not be described again.
The cavity size of the filter realized according to the above embodiment is 23mm long, 12mm wide and 18.4mm high. The cavity of the filter is made of metal, in this embodiment made of metallic aluminum, and the surface layer is plated with silver to reduce loss, and in this embodiment the dielectric substrate has a dielectric constant of 38.5 and the supporting medium has a dielectric constant of 2.2. The simulation result of a small dielectric loaded filter with a wide stop band is shown in fig. 7. The passband of the filter is centered at 718MHz and has a bandwidth of 30MHz (4.2% FBW), and the filter is used for a 5G network with a frequency of 700M.
The small medium loading filter with the wide stop band has good pass band characteristic and stop band characteristic, has extremely small size, can meet the design requirement of a high-performance communication system, can be applied to microwave electronic systems such as mobile communication, radar, remote sensing and the like, and is worthy of popularization. The present invention includes, but is not limited to, the above-mentioned embodiments, and those skilled in the art can make various modifications and substitutions without departing from the principle of the present invention, such as changing the position of the feed line, changing the annular dielectric into other shapes, and using other metals for machining or electroplating, and these modifications and substitutions also fall within the protection scope of the present patent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A wide stopband compact dielectrically-loaded filter, comprising: a first resonant cavity, a second resonant cavity and a coupling window; the small medium loading filter with the wide stop band is symmetrical about the central plane of the coupling window; the inner cavities of the first resonant cavity and the second resonant cavity are both mirror symmetry structures with upper hollowed cylinders and lower hollowed cuboids;
the first resonant cavity and the second resonant cavity respectively comprise: the device comprises a metal four-pie loading resonance rod, a first medium substrate, a second medium substrate, a third medium substrate and a supporting medium; the metal four-wafer loading resonance rod is a resonance structure of the small medium loading filter with the wide stop band and is used for generating a resonance mode; the first dielectric substrate, the second dielectric substrate and the third dielectric substrate have the same structure and are nested among the four metal wafers of the metal four-wafer loading resonance rod, and the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are used for reducing the resonance frequency of a resonance mode; the coupling window is a coupling structure of the small medium loading filter with the wide stop band and is used for controlling the coupling coefficient of the pass band; the top end of the metal four-wafer loading resonant rod is open-circuited, and the bottom end of the metal four-wafer loading resonant rod is connected with the bottom end of the resonant cavity.
2. The wide stop band small dielectric loaded filter as claimed in claim 1, wherein the metal four-disk loading resonator rod is formed by loading four metal disks with the same size on the same metal cylindrical rod, and the bottom end of the metal cylindrical rod is welded to the bottom surface of the first resonator.
3. The wide stop band compact dielectric loaded filter of claim 1 or 2, further comprising a first metal tuning disk, said second metal tuning disk and an adjustment screw, said first metal disk passing through said first resonant cavity, said second metal tuning disk passing through said second resonant cavity, and the height of said first metal tuning disk and said second metal tuning disk being adjustable by said adjustment screw.
4. The wide stop band compact dielectrically-loaded filter according to claim 3, wherein said coupling window comprises a window structure, said window structure having dimensions that control the coupling coefficient of the pass band, said coupling window having a center penetrated by said adjustment screw, and wherein said adjustment of the coupling coefficient between said first resonator and said second resonator is achieved by adjusting the depth of said adjustment screw.
5. The wide stop band compact dielectric loaded filter of claim 3, wherein said first dielectric substrate, said second dielectric substrate and said third dielectric substrate are all circular ring structures with a hole, and said metal cylindrical rod of said metal quadruple-pie loading resonator rod is inserted through said hole.
6. The wide stop band compact dielectric loaded filter of claim 3, further comprising an input port and an output port open at an input side of said first resonator and at an output side of said second resonator, respectively.
7. The wide stopband compact dielectric loaded filter of claim 6, further comprising a tapped feed line, wherein the tapped feed line is a coaxial inner conductor extension line of the input port, and the input port sends an input signal to the metal quadruple-pie loading resonant rod through the tapped feed line; the height of the tapped feed line controls the external quality factor of the passband.
8. The wide stop band small dielectric loaded filter of claim 7, wherein the supporting dielectric has a hole at the feeding position, and the tapped feed line is welded below the resonant rod of the metal four-chip loaded resonant rod through the hole of the supporting dielectric.
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2021
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