CN209948011U - Third-order band-stop filter and communication equipment - Google Patents
Third-order band-stop filter and communication equipment Download PDFInfo
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- CN209948011U CN209948011U CN201921032277.7U CN201921032277U CN209948011U CN 209948011 U CN209948011 U CN 209948011U CN 201921032277 U CN201921032277 U CN 201921032277U CN 209948011 U CN209948011 U CN 209948011U
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Abstract
The utility model discloses a third-order band elimination filter and communication equipment, the filter includes three metal sheets, two probes and a probe, three metal sheets superpose in proper order, and the edge of three metal sheets is squeezed into many metal posts, constitutes medium integrated waveguide structure, and three metal sheets are the metal sheet on first side, the metal sheet in the middle of and the metal sheet on second side respectively, and open at the metal sheet center in the middle of has first rectangle gap; the two probes are connected through a dielectric waveguide structure, the probe penetrates through the dielectric integrated waveguide structure, the first end of the probe is located at the center of one probe, and the second end of the probe is located at the center of the other probe. The utility model discloses a wave filter adopts coaxial feeder and extension probe design, and the extension probe passes through the integrated waveguide structure of medium and links to each other, and not use the main transmission line to dispose the syntonizer, has narrowband, small-size, high selectivity and good outband rejection performance, can be fine satisfy modern communication system's requirement.
Description
Technical Field
The utility model relates to a wave filter, especially a third-order band elimination filter and communications facilities belong to the communication technology field.
Background
The third-order band-stop filter is an indispensable device for a transmitting end and a receiving end in a modern communication system, can form a stop band in a certain frequency band to inhibit interference signals, and forms two pass bands in the upper frequency band and the lower frequency band. The standard design approach for a third order band-stop filter is to cascade band-stop resonant elements arranged along the main transmission line connecting the input and output. The third-order band-stop filter designed by adopting planar transmission lines such as a microstrip and a coplanar waveguide has the advantages of small volume, easy integration and the like, but has large loss and is usually applied to a broadband system. The traditional waveguide third-order band-stop filter, such as a rectangular waveguide and a cylindrical waveguide, has the advantage of low power loss, and the waveguide circuit has large size and high cost and is not easy to integrate.
Dielectric integrated waveguide (SIW) has been widely used in the design and manufacture of millimeter wave filters because of its advantages of high quality factor, low cost, small size, light weight, and easy integration with other components. Kilda et al designed a ridge-notched waveguide filter, in which a notch is formed between two parallel metal plates, wherein a waveguide metal ridge structure is formed on the surface of one metal plate, and the periphery of the waveguide metal ridge structure is surrounded by a plurality of metal pillar structures to form a needle-like structure surface to provide a stop band. Husain et al design a third-order band-stop filter by using a substrate integrated waveguide technology, respectively couple rectangular waveguides, circular waveguides and sector waveguide resonators with a main waveguide to form a stop band, and analyze respective stop band characteristics, and researches show that different waveguide resonator design schemes show different attenuation characteristics at different resonant frequencies. Wujin Hui of Nanjing theory of technology university designs a coaxial cavity three-order band-stop filter based on a uniform impedance resonator according to the design principle of the filter, and based on the structure of the filter, a metal resonance rod is replaced by a dielectric resonator, and a dielectric three-order band-stop filter is designed, so that the volume is smaller, and the Q value is higher.
In recent years, substrate integrated waveguide technology has been successfully applied to design filters with low insertion loss, simple design, and potential integration capability with planar circuits, and many elliptical or quasi-elliptical filters have been designed using substrate integrated waveguides. In subsequent research studies by researchers, more and more researchers have utilized substrate-integrated waveguide resonators to reduce the size of filters, and they have good selectivity, small size and processability.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a third-order band elimination filter, this filter adopts coaxial feeder and extension probe design, and the extension probe links to each other through medium integrated waveguide structure, and not use the main transmission line to dispose the syntonizer, has narrowband, small-size, high selectivity and good outband rejection performance, the requirement that satisfies modern communication system that can be fine.
Another object of the present invention is to provide a communication device.
The purpose of the utility model can be achieved by adopting the following technical scheme:
a third-order band elimination filter comprises three metal plates, two probes and a probe, wherein the three metal plates are sequentially overlapped, a plurality of metal columns are driven into the edges of the three metal plates to form a medium integrated waveguide structure, the three metal plates are respectively a first-edge metal plate, a middle metal plate and a second-edge metal plate, and a first rectangular gap is formed in the center of the middle metal plate;
the two probes are connected through a dielectric waveguide structure, the probe penetrates through the dielectric integrated waveguide structure, the first end of the probe is located at the center of one probe, and the second end of the probe is located at the center of the other probe.
Furthermore, one probe of the two probes is embedded into the metal plate on the first side, and the other probe of the two probes is embedded into the metal plate on the second side;
and the middle metal plate is provided with circular gaps corresponding to the two probes, and the circular gaps are respectively connected with the two probes.
Furthermore, one probe of the two probes is embedded in the position of the metal plate of the first side, which is deviated from the center, and the other probe of the two probes is embedded in the position of the metal plate of the second side, which is deviated from the center.
Furthermore, a plurality of first via holes which are uniformly distributed are formed in the peripheries of the three metal plates, the first via holes in each metal plate correspond to the metal columns one to one, and each first via hole can enable the corresponding metal column to penetrate through.
Further, the number of the metal posts is thirty-four, and the number of the first via holes on each metal plate is thirty-four.
Further, of the thirty-four first vias on each metal plate, four first vias are located at four corners of the metal plate, seven first vias are located at the upper edge of the metal plate and between the upper left corner and the upper right corner of the metal plate, seven first vias are located at the lower edge of the metal plate and between the lower left corner and the lower right corner of the metal plate, eight first vias are located at the left edge of the metal plate and between the upper left corner and the lower left corner of the metal plate, and eight second vias are located at the right edge of the metal plate and between the upper right corner and the lower right corner of the metal plate.
Furthermore, second through holes are formed in all the three metal plates, and the second through holes can enable probes to penetrate through the second through holes.
Furthermore, a second rectangular gap is formed in each of the metal plate on the first side and the metal plate on the second side.
Further, a second rectangular gap on the metal plate on the first side is connected with one probe, and a second rectangular gap on the metal plate on the second side is connected with the other probe.
The utility model discloses a further purpose can reach through taking following technical scheme:
a communication device comprises the third-order band-stop filter.
The utility model discloses for prior art have following beneficial effect:
the filter of the utility model is provided with three metal plates, two probes and one probe, the three metal plates are overlapped in sequence, a plurality of metal columns are punched at the edges of the three metal plates to form a medium integrated waveguide structure, the two probes are connected through the medium integrated waveguide structure, the circuit size can be reduced, the probe passes through the medium integrated waveguide structure and is used as a coaxial feeder line to enable the three metal plates of the medium integrated waveguide structure to form three resonant cavities, a stop band is generated by a resonator excited by the probe, the two resonant cavities are provided with a resonant cavity module and a low-frequency section reflection zero point, the middle resonant cavity generates a resonant zero point at an upper pass band, a rectangular gap opened by the middle medium plate generates a resonant mode, no additional element is needed, two resonant cavity modules are combined into a three-order band elimination filter, the traditional main transmission line is saved, and the frequency selection performance is improved, the characteristics of miniaturization, high selectivity, simple design and processing and the like can be met; in addition, rectangular gaps can be formed in the metal plates on the two sides, and the out-of-band performance can be adjusted through the rectangular gaps, so that the out-of-band rejection performance is improved.
Drawings
Fig. 1 is a schematic perspective view of a third-order band-stop filter according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a front view structure of a third-order band-stop filter according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of an intermediate metal plate of a third-order band-stop filter according to embodiment 1 of the present invention.
Fig. 4 is a schematic side view of a third-order band-stop filter according to embodiment 1 of the present invention.
Fig. 5 is a graph illustrating electromagnetic simulation and measurement of the frequency response of the third-order band-stop filter according to embodiment 1 of the present invention.
The device comprises a metal plate 1, a probe 2, a metal column 3, a first probe 4, a second probe 5, a first rectangular gap 6, a circular ring gap 7, a first via hole 8, a second via hole 9 and a second rectangular gap 10.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Example 1:
as shown in fig. 1 to 4, the present embodiment provides a third-order band-stop filter, which includes three metal plates 1, two probes and a probe 2, wherein the three metal plates 1 are sequentially stacked from front to back, and thirty-four metal posts 3 are driven into the edges of the three metal plates 1 to form a dielectric integrated waveguide structure, the three metal plates 1 are respectively a front metal plate 1, a middle metal plate 1 and a rear metal plate 1, and the two probes are respectively a first probe 4 and a second probe 5.
The center of the middle metal plate 1 is provided with a first rectangular gap 6, the first rectangular gap 6 is vertically arranged and is a resonator, the first probe 4 and the second probe 5 are SMA probes which are connected through a dielectric integrated waveguide structure, the circuit size can be reduced, the probe 2 penetrates through the dielectric integrated waveguide structure, the first end of the probe 2 is positioned at the center of the first probe 4, the second end of the probe 2 is positioned at the center of the second probe 5, namely the probe 2 is a coaxial feeder line, the first end of the probe 2 and the first probe 4 are used as a first feed port, the second end of the probe 2 and the second probe 5 are used as a second feed port, so that three metal plates 1 of the dielectric integrated waveguide structure form three resonant cavities, the resonator excited by the probe 2 generates a stop band, the front resonant cavity and the rear resonant cavity are provided with a resonant cavity mode and a low-frequency section reflection zero point, and the middle resonant cavity generates a resonance on the upper pass band, the first rectangular gap 6 generates a resonant mode, and two resonant cavity modules are combined into a third-order band-stop filter without additional elements.
In order to realize the connection of the first probe 4 and the second probe 5 through the dielectric integrated waveguide structure, the first probe 4 is embedded into the metal plate 1 at the front side, the second probe 5 is embedded into the metal plate 1 at the rear side, the middle metal plate 1 is provided with a circular gap 7 corresponding to the first probe 4 and the second probe 5, and the circular gap 7 is respectively connected with the first probe 4 and the second probe 5.
Further, the first probe 4 is embedded in the front metal plate 1 at a position deviated from the center, and the second probe 5 is embedded in the rear metal plate 1 at a position deviated from the center, wherein the first probe 4 is deviated to the left, and the second probe 5 is deviated to the right, it can be understood that the first probe 4 is deviated to the right, and the second probe 5 is deviated to the left.
In order to drive thirty-four metal columns 3 into the edges of the three metal plates 1, thirty-four first through holes 8 are uniformly distributed around the three metal plates 1, the first through holes 8 on each metal plate correspond to the metal columns 3 one by one, and each first through hole 8 can enable the corresponding metal column 3 to penetrate through.
Further, of thirty-four first vias 8 on each metal plate 1, four first vias 8 are located at four corners of the metal plate 1, seven first vias 8 are located at the upper edge of the metal plate 1 and between the upper left corner and the upper right corner of the metal plate 1, seven first vias 8 are located at the lower edge of the metal plate 1 and between the lower left corner and the lower right corner of the metal plate 1, eight first vias 8 are located at the left edge of the metal plate 1 and between the upper left corner and the lower left corner of the metal plate 1, and eight second vias 8 are located at the right edge of the metal plate and between the upper right corner and the lower right corner of the metal plate 1.
Accordingly, of thirty-four metal posts 3, four metal posts 3 pass through four corners of three metal plates 1, seven metal posts 3 pass through upper edges of the three metal plates 1, seven metal posts 3 pass through lower edges of the three metal plates 1, eight metal posts 3 pass through left edges of the three metal plates 1, and eight metal posts 3 pass through lower edges of the three metal plates 1.
In order to enable the probe 2 to penetrate through the dielectric integrated waveguide structure, second through holes 9 are formed in the three metal plates 1, and the probe 2 can penetrate through the second through holes 9.
In order to realize the adjustment of the out-of-band performance, the metal plate 1 at the front side and the metal plate 1 at the rear side are respectively provided with a second rectangular gap 10, the second rectangular gaps 10 are vertically arranged, the second rectangular gap 10 on the metal plate 1 at the front side deviates from the center of the metal plate 1 at the front side and is connected with the first probe 4, the second rectangular gap 10 on the metal plate 1 at the rear side deviates from the center of the metal plate 1 at the rear side and is connected with the second probe 5, and the out-of-band inhibition performance (also called stop band inhibition performance) can be improved through the second rectangular gaps 10.
The metal plate 1, the probe 2, the metal column 3, the first probe 4, and the second probe 5 in this embodiment may be any one of aluminum, iron, tin, copper, silver, gold, and platinum, or may be an alloy of any one of aluminum, iron, tin, copper, silver, gold, and platinum, and preferably, a copper material is used.
The electromagnetic simulation and measurement curve diagram of the frequency response of the third-order band-stop filter of the present embodiment is shown in FIG. 5, in which | S11L represents the return loss of the first feed port, | S21The filter has a resonant cavity mode and a low-frequency band reflection zero point, generates a resonance zero point in an upper pass band, and improves the frequency selection performance and the stop band rejection performance at the same time.
Example 2:
the present embodiment provides a communication device, which may be a mobile phone, a tablet computer, or the like, and includes the third-order band-stop filter of embodiment 1.
To sum up, the filter of the present invention is provided with three metal plates, two probes and one probe, wherein the three metal plates are sequentially stacked, and a plurality of metal posts are driven into the edges of the three metal plates to form a dielectric integrated waveguide structure, the two probes are connected through the dielectric integrated waveguide structure, thereby reducing the circuit size, and the probe passes through the dielectric integrated waveguide structure as a coaxial feeder to form three resonant cavities by the three metal plates of the dielectric integrated waveguide structure, the resonator excited by the probe generates a stop band, the two resonant cavities have a resonant cavity mode and a low-frequency reflection zero point, the middle resonant cavity generates a resonant zero point at the upper pass band, the rectangular gap opened by the middle dielectric plate generates a resonant mode, without additional elements, the two resonant cavity modules are combined into a three-order band stop filter, thereby omitting the traditional main transmission line and improving the frequency selection performance, the characteristics of miniaturization, high selectivity, simple design and processing and the like can be met; in addition, rectangular gaps can be formed in the metal plates on the two sides, and the out-of-band performance can be adjusted through the rectangular gaps, so that the out-of-band rejection performance is improved.
The above, only be the embodiment of the utility model discloses a patent preferred, nevertheless the utility model discloses a protection scope is not limited to this, and any technical personnel who is familiar with this technical field are in the utility model discloses a within range, according to the utility model discloses a technical scheme and utility model design equivalence substitution or change all belong to the protection scope of the utility model patent.
Claims (10)
1. A third order band reject filter, comprising: the medium integrated waveguide structure comprises three metal plates, two probes and a probe, wherein the three metal plates are sequentially overlapped, a plurality of metal columns are driven into the edges of the three metal plates to form the medium integrated waveguide structure, the three metal plates are respectively a first-edge metal plate, a middle metal plate and a second-edge metal plate, and a first rectangular gap is formed in the center of the middle metal plate;
the two probes are connected through a dielectric waveguide structure, the probe penetrates through the dielectric integrated waveguide structure, the first end of the probe is located at the center of one probe, and the second end of the probe is located at the center of the other probe.
2. The third order band reject filter of claim 1, wherein: one probe of the two probes is embedded into the metal plate on the first side, and the other probe of the two probes is embedded into the metal plate on the second side;
and the middle metal plate is provided with circular gaps corresponding to the two probes, and the circular gaps are respectively connected with the two probes.
3. The third order band reject filter of claim 2, wherein: one probe of the two probes is embedded in the position of the metal plate of the first edge, which is deviated from the center, and the other probe of the two probes is embedded in the position of the metal plate of the second edge, which is deviated from the center.
4. The third order band reject filter of claim 1, wherein: a plurality of first via holes which are uniformly distributed are formed in the peripheries of the three metal plates, the first via holes in each metal plate correspond to the metal columns one to one, and each first via hole can enable the corresponding metal column to penetrate through.
5. The third order band reject filter of claim 4, wherein: thirty-four metal columns and thirty-four first via holes in each metal plate.
6. The third order band reject filter of claim 5, wherein: the first through holes are positioned at the four corners of each metal plate, the seven first through holes are positioned at the upper edge of the metal plate and positioned between the upper left corner and the upper right corner of the metal plate, the seven first through holes are positioned at the lower edge of the metal plate and positioned between the lower left corner and the lower right corner of the metal plate, the eight first through holes are positioned at the left edge of the metal plate and positioned between the upper left corner and the lower left corner of the metal plate, and the eight second through holes are positioned at the right edge of the metal plate and positioned between the upper right corner and the lower right corner of the metal plate.
7. The third order band reject filter of claim 1, wherein: and the three metal plates are all provided with second through holes, and the second through holes can enable probes to pass through.
8. A third order band reject filter according to any of claims 1 to 7, characterized in that: and the metal plate on the first side and the metal plate on the second side are both provided with second rectangular gaps.
9. The third order band reject filter of claim 8, wherein: the second rectangular gap on the metal plate on the first side is connected with one probe, and the second rectangular gap on the metal plate on the second side is connected with the other probe.
10. A communication device, characterized by: comprising a third order band reject filter according to any of claims 1 to 9.
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| CN201921032277.7U CN209948011U (en) | 2019-07-04 | 2019-07-04 | Third-order band-stop filter and communication equipment |
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| CN201921032277.7U CN209948011U (en) | 2019-07-04 | 2019-07-04 | Third-order band-stop filter and communication equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265758A (en) * | 2019-07-04 | 2019-09-20 | 华南理工大学 | Three rank bandstop filters and communication equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265758A (en) * | 2019-07-04 | 2019-09-20 | 华南理工大学 | Three rank bandstop filters and communication equipment |
| CN110265758B (en) * | 2019-07-04 | 2024-03-29 | 华南理工大学 | Third-order band-stop filter and communication equipment |
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