CN212342779U - Microwave dielectric waveguide filter with half-pin hole coupling - Google Patents
Microwave dielectric waveguide filter with half-pin hole coupling Download PDFInfo
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- CN212342779U CN212342779U CN202021196293.2U CN202021196293U CN212342779U CN 212342779 U CN212342779 U CN 212342779U CN 202021196293 U CN202021196293 U CN 202021196293U CN 212342779 U CN212342779 U CN 212342779U
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Abstract
The utility model relates to a dielectric filter technical field, specifically relate to microwave dielectric waveguide filter with half cotter hole coupling, adopt half cotter hole to realize the coupling between two microwave dielectric waveguide syntonizers, utilize the reactance characteristic of half cotter hole, the series resonance who adds half cotter hole in parallel produces transmission zero in microwave dielectric waveguide filter, does not increase microwave dielectric waveguide filter's rank simultaneously, has showing the transmission attenuation characteristic that has improved the filter near transmission zero frequency; in addition, the in-band insertion loss of the dielectric waveguide filter is basically the same as that of a medium waveguide filter with a common structure of the same order, the whole structure is simple, the miniaturization of the filter is facilitated, the processing difficulty is reduced, and the mass production is easy.
Description
Technical Field
The utility model relates to a dielectric filter technical field specifically is to relate to microwave dielectric waveguide filter with half round pin hole coupling.
Background
With the rapid development of modern communication technology, the available spectrum resources are increasingly strained, and thus the requirements on the frequency selection characteristics of the filter are increasingly high. In order to increase communication capacity and avoid interference between adjacent channels, filters are required to have steep out-of-band rejection; to improve the signal-to-noise ratio, low insertion loss in the passband is required; in order to meet the miniaturization trend of modern communication terminals, smaller size and weight of the filter are required. At present, a dielectric filter, particularly a microwave dielectric waveguide resonator filter, becomes a new direction of a 5G filter by virtue of the advantages of high Q value, low insertion loss, small size, light weight and the like, and has wide application prospect.
In the design of the traditional microwave waveguide filter, the effective method for improving out-of-band rejection of the medium waveguide filter with the common structure is to increase the order of the filter, and the method has certain defects: firstly, the insertion loss of the filter is correspondingly increased, which can affect the overall performance of the system; secondly, in a specific system, such as a 5G communication system, the order is increased, the size and weight of the filter are increased, which brings difficulties to the miniaturization and lightweight design, and the method for increasing the order of the filter has limitations in practical application, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned problem, provide a microwave dielectric waveguide filter with half round pin hole coupling, adopt half round pin hole to realize the coupling between two microwave dielectric waveguide syntonizers, utilize the reactance characteristic in half round pin hole, the series resonance who adds half round pin hole in parallel produces transmission zero point in microwave dielectric waveguide filter, makes near transmission zero point place frequency obtain good transmission attenuation characteristic.
The utility model discloses a technical scheme be, provide a microwave dielectric waveguide filter with coupling of half round pin hole, be provided with the dielectric block of conducting layer including the surface, be provided with a plurality of microwave dielectric waveguide syntonizers on the dielectric block, be provided with the electromagnetic coupling structure between the adjacent microwave dielectric waveguide syntonizer, the coupling structure be half round pin hole, half round pin hole be the blind hole of setting between two adjacent microwave dielectric waveguide syntonizers.
Each microwave dielectric waveguide resonator is provided with a tuning hole which is a blind hole.
The tuning hole openings of two adjacent microwave dielectric waveguide resonators are in the same direction or in different directions.
The opening direction of the half pin hole is the same as or opposite to the opening direction of the tuning holes of the two adjacent microwave dielectric waveguide resonators.
And chamfers are arranged between the intersecting interfaces of all elements of the microwave dielectric waveguide filter.
The beneficial effects of the utility model are that, a microwave dielectric waveguide filter with half-pin hole coupling is provided, adopt half-pin hole to realize the coupling between two microwave dielectric waveguide syntonizers, utilize the reactance characteristic of half-pin hole, the series resonance who adds half-pin hole in parallel in microwave dielectric waveguide filter produces transmission zero point, does not increase the rank of microwave dielectric waveguide filter simultaneously, has showing the transmission attenuation characteristic that has improved the filter near transmission zero point place frequency; in addition, the in-band insertion loss of the dielectric waveguide filter is basically the same as that of a medium waveguide filter with a common structure of the same order, the whole structure is simple, the miniaturization of the filter is facilitated, the processing difficulty is reduced, and the mass production is easy.
Drawings
Fig. 1 is a schematic structural diagram of a conventional four-cavity waveguide filter coupled by a diaphragm;
fig. 2 is a schematic structural diagram of a four-cavity microwave dielectric waveguide filter with half-pin-hole coupling according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a microwave dielectric waveguide filter in a top view in embodiment 1 of the present invention;
FIG. 4 is a schematic cross-sectional view taken along the X-X direction of the microwave dielectric waveguide filter shown in FIG. 3;
fig. 5 is a schematic structural diagram of a four-cavity microwave dielectric waveguide filter with half-pin-hole coupling according to embodiment 2 of the present invention;
fig. 6 is a schematic structural diagram of a four-cavity microwave dielectric waveguide filter having a tuning hole coupled with a half pin hole and having a deviating opening direction according to embodiment 3 of the present invention;
fig. 7 is a schematic structural view of a half pin hole in a waveguide according to the present invention;
fig. 8 is an equivalent circuit diagram of a half pin hole in a waveguide according to the present invention;
fig. 9 is a response curve of the S21 parameter of a half pin hole in a waveguide according to the present invention.
In the figure, the resonator comprises a dielectric block 1, a dielectric block 2, a microwave dielectric waveguide resonator 3, a half pin hole 4, an inductance diaphragm 5, a tuning hole 6, a signal input and output blind hole 7 and a conducting layer.
Detailed Description
As shown in fig. 1-9, the utility model provides a microwave dielectric waveguide filter with half round pin hole coupling, be provided with the dielectric block 1 of conducting layer including the surface, be provided with a plurality of microwave dielectric waveguide syntonizers 2 on the dielectric block 1, be provided with the electromagnetic coupling structure between the adjacent microwave dielectric waveguide syntonizer 2, the coupling structure be half round pin hole 3, half round pin hole 3 for setting up the blind hole between two adjacent microwave dielectric waveguide syntonizers 2.
Each microwave dielectric waveguide resonator 2 is provided with a tuning hole 5, and the tuning holes 5 are blind holes.
The opening directions of the tuning holes 5 of two adjacent microwave dielectric waveguide resonators 2 are the same or are deviated.
The opening direction of the half pin hole 3 is the same as or opposite to the opening direction of the tuning holes 5 of the two adjacent microwave dielectric waveguide resonators 2.
And chamfers are arranged between the intersecting interfaces of all elements of the microwave dielectric waveguide filter.
The present invention will be further described with reference to the following specific embodiments.
In specific embodiment 1, as shown in fig. 2 to 4, a dielectric block 1 with a conductive layer 7 on the surface includes four microwave dielectric waveguide resonators 2, two middle adjacent microwave dielectric waveguide resonators 2 realize electromagnetic coupling of signals between the resonators through a half pin hole 3, the half pin hole 3 is a blind hole on the surface of a filter body between two middle adjacent microwave dielectric waveguide resonators 2, an opening is formed in the upper surface of a waveguide wide surface, and the half pin hole 3 may be disposed at a certain distance away from the waveguide axis as needed. The other microwave dielectric waveguide resonators 2 adopt inductive diaphragms 4 to realize electromagnetic coupling of signals between the adjacent microwave dielectric waveguide resonators 2, the inductive diaphragms 4 are through grooves formed in narrow faces on one sides of the waveguides, the bottoms of the grooves form closed structures in the dielectric blocks, and two ends of each groove penetrate through the upper and lower wide faces of the waveguides respectively.
Each microwave dielectric waveguide resonator 2 can be provided with a tuning hole 5 with a blind hole structure for tuning the frequency of the microwave dielectric waveguide resonator 2, the tuning hole 5 and the half pin hole 3 have the same opening direction, the openings are all on the waveguide upper wide surface of the microwave dielectric waveguide resonator 2, the microwave dielectric waveguide resonators 2 at the two ends of the filter are provided with signal input and output blind holes 6, and the opening direction of the blind holes deviates from the opening direction of the tuning hole 5 on the microwave dielectric waveguide resonator 2.
As shown in fig. 7 to 8, the equivalent circuit diagram of the half-pin hole is similar to that of the diaphragm and the pin, so that the half-pin hole 3 can replace the diaphragm and the pin to perform electromagnetic coupling between the microwave dielectric waveguide resonators 2.
As shown in fig. 9, the half-pin hole 3 in the waveguide was simulated by high-frequency electromagnetic simulation software to obtain an S21 parameter response curve of the half-pin hole 3, which has a shape of an absorption peak. In addition, according to the microwave principle, the half pin hole 3 positioned at the top end of the wide surface of the waveguide constructs a path for the axial current of the wide surface, so that the current flows in the half pin hole 3, a magnetic field can be radiated to the periphery of the half pin hole, and the half pin hole 3 is equivalent to an inductor; however, the top end of the half pin hole 3 forms a capacitor with the conductive wall on the other wide surface of the waveguide at the same time, and an electric field is radiated between the two conductive walls, so that the half pin hole 3 replaces a diaphragm and a pin to realize the electromagnetic coupling of signals between the microwave dielectric waveguide resonators 2, under certain conditions, the series LC resonance circuit is equivalently connected on a transmission line in parallel and acts as a band-resistance cavity, and therefore, a transmission zero point can be generated in the transmission curve of the filter.
By utilizing the reactance characteristic of the half-pin hole 3, the series resonance of the half-pin hole 3 is added in parallel in the microwave dielectric waveguide filter to generate a transmission zero point, so that the frequency near the transmission zero point obtains good microwave transmission attenuation characteristic.
The diameter of the half-pin hole 3, the depth of the half-pin hole inserted into the waveguide and the distance from the axis of the waveguide are related to the required position of the transmission zero point, the magnitude of the coupling coefficient between the adjacent microwave dielectric waveguide resonators 2 and the dielectric constant of the adopted microwave dielectric material.
The body of the microwave dielectric waveguide filter is made of ceramic, glass, quartz, plastic and other low microwave loss dielectric materials with the dielectric constant larger than 1, the utility model discloses first-selected microwave dielectric ceramic, the intersecting interface involved in the structure of the microwave dielectric waveguide filter body can be added with chamfers according to the requirements of process and performance and/or the whole or part.
The surface of the body dielectric block of the microwave dielectric waveguide filter comprises a groove and a hole, and except that a part of the dielectric is exposed as required due to a signal input and output structure, a metal layer of the dielectric is removed, and the dielectric is metalized. The metallization mode and the material of the metal do not make special requirements, and the metal silver is preferred.
The metal layer on the surface of the microwave dielectric waveguide filter body medium, including the metal layer in the groove and the hole, can be removed at one or more places in order to meet the performance requirements of the microwave dielectric waveguide filter due to tuning, coupling and the like. This work is reversible as required.
In the description, the definitions of the wide and narrow surfaces of the waveguide do not represent the dimension in the strict mathematical sense, and sometimes, due to the arrangement of the folding row cavity, the input and output structure, and the adoption of the evanescent mode (evanescent mode) waveguide and the ridge waveguide, the physical dimension may be changed as long as the resonance condition, the boundary condition and the mutual coupling relationship of the microwave electromagnetic field of the microwave dielectric waveguide resonator can be satisfied.
The transmission zero, the membrane (slot), the pin (hole) have the same meaning as the electromagnetic field known to the person skilled in the art of microwave technology theory or defined in textbooks. The half pin hole is shorter than the normal pin hole, i.e. shorter than the narrow surface height of the waveguide, and can penetrate into the dielectric waveguide on any waveguide wide surface without penetrating through the corresponding waveguide wide surface.
The coupling between the two microwave dielectric waveguide resonators 2 is realized by adopting the half pin holes 3, the half pin holes 3 are added between the microwave dielectric waveguide filters 2 to generate transmission zero points by utilizing the reactance characteristics of the half pin holes 3, and meanwhile, the order of the microwave dielectric waveguide filters is not increased, so that the transmission attenuation characteristics of the filters near the frequency of the transmission zero points are obviously improved; in addition, the in-band insertion loss of the waveguide filter is basically the same as that of a common-structure waveguide filter with the same order, the whole structure is simple, the miniaturization of the filter is facilitated, the processing difficulty is reduced, and the mass production is easy.
The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but it is not understood to limit the scope of the invention, and it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications, improvements and substitutions can be made, which all belong to the protection scope of the present invention, therefore, the protection scope of the present invention shall be subject to the appended claims.
Claims (5)
1. Microwave dielectric waveguide filter with half round pin hole coupling is provided with dielectric block (1) of conducting layer including the surface, is provided with a plurality of microwave dielectric waveguide syntonizers (2) on dielectric block (1), is provided with electromagnetic coupling structure, its characterized in that between adjacent microwave dielectric waveguide syntonizer (2): the coupling structure is a half pin hole (3), and the half pin hole (3) is a blind hole arranged between the microwave dielectric waveguide resonators (2).
2. A microwave dielectric waveguide filter with half-pin-hole coupling as claimed in claim 1, wherein: each microwave dielectric waveguide resonator (2) is provided with a tuning hole (5), and the tuning holes (5) are blind holes.
3. A microwave dielectric waveguide filter with half-pin-hole coupling as claimed in claim 2, wherein: the opening directions of the tuning holes (5) of two adjacent microwave dielectric waveguide resonators (2) are the same or are deviated.
4. A microwave dielectric waveguide filter with half-pin-hole coupling as claimed in claim 1, wherein: the opening direction of the half pin hole (3) is the same as or different from the opening direction of the tuning holes (5) of the two adjacent microwave dielectric waveguide resonators (2).
5. The microwave dielectric waveguide filter with half-pin-hole coupling of any one of claims 1 to 4, wherein: and chamfers are arranged between the intersecting interfaces of all elements of the microwave dielectric waveguide filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021196293.2U CN212342779U (en) | 2020-06-24 | 2020-06-24 | Microwave dielectric waveguide filter with half-pin hole coupling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021196293.2U CN212342779U (en) | 2020-06-24 | 2020-06-24 | Microwave dielectric waveguide filter with half-pin hole coupling |
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| CN212342779U true CN212342779U (en) | 2021-01-12 |
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| CN202021196293.2U Active CN212342779U (en) | 2020-06-24 | 2020-06-24 | Microwave dielectric waveguide filter with half-pin hole coupling |
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