CN117895200B - 5G substrate integrated coaxial filter based on extraction pole resonator - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/202—Coaxial filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a 5G substrate integrated coaxial filter based on an extraction pole resonator, which belongs to the technical field of communication and comprises four layers of dielectric substrates arranged from top to bottom, eight layers of metal layers arranged from top to bottom and four resonators. The present invention provides a substrate integrated coaxial filter using a multi-layer structure, which allows the coupling between resonators to be in the form of both vertical and horizontal coupling, thus maintaining a compact size of the design. And the invention combines the pole resonators, and utilizes electromagnetic hybrid coupling to construct coupling between the resonators, thereby realizing three zero points on the left side of the filter passband and realizing good energy inhibition.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Background
With the rapid advancement of radio frequency communication systems, the demand for communication devices has increased dramatically. Particularly, with the development of advanced communication technologies such as 5G frequency band, the left-side stopband suppression capability of the filter for the 5G frequency band with the frequency lower than 6 GHz is urgently needed. While the number of zeros tends to be associated with the out-of-band rejection capability of the band-pass filter.
There are many ways to construct the zero point today. The most widely used method is cross coupling, which is a way to create a zero by constructing a coupling between non-adjacent resonance points. The technique makes the frequency response of the filter sharper, improves the selectivity of the filter, and is useful for applications requiring steep transitions on both sides of the passband. The design and implementation of cross-coupling structures can be relatively complex, especially in miniaturized filter designs. Furthermore, this approach may increase the size and cost of the filter. The application of the technology is often in satellite communication and high-end wireless communication systems.
Additional zeros can also be created using the extraction pole resonator. The technique combines a resonant point and a non-resonant point to produce a pole and a transmission zero at the same time. The pole extraction technique provides greater flexibility, particularly in terms of miniaturization and frequency tuning. This method can also achieve high selectivity without adding extra size. Although the pole extraction technique is relatively simple in design, it is often applied in planar structures and connected to other resonators in a wired fashion. This is disadvantageous to some extent in terms of further miniaturization of the design. The pole-based technique is suitable for applications requiring high miniaturization while maintaining good performance, such as portable communication devices and integrated radio frequency systems.
The above solution of constructing the zero point often accompanies the problem of inflexibility in design.
Disclosure of Invention
Aiming at the defects in the prior art, the 5G substrate integrated coaxial filter based on the pole resonator solves the problems that the size of the current filter is not compact enough, the left side inhibition capability is poor and the zero point cannot be flexibly regulated and controlled in the 6GHz frequency band.
In order to achieve the above purpose, the invention adopts the following technical scheme: the 5G substrate integrated coaxial filter based on the extraction pole resonator comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, a first metal layer, a second metal layer, a third metal layer, a fourth metal layer, a fifth metal layer, a sixth metal layer, a seventh metal layer, an eighth metal layer, a first extraction pole resonator, a second extraction pole resonator, a first quarter-wavelength step impedance resonator and a second quarter-wavelength step impedance resonator;
The first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the fourth dielectric substrate are sequentially arranged from top to bottom, the first metal layer, the second metal layer, the third metal layer, the fourth metal layer, the fifth metal layer, the sixth metal layer, the seventh metal layer and the eighth metal layer are sequentially arranged from top to bottom, the first dielectric substrate is positioned between the first metal layer and the second metal layer, the second dielectric substrate is positioned between the third metal layer and the fourth metal layer, the third dielectric substrate is positioned between the fifth metal layer and the sixth metal layer, and the fourth dielectric substrate is positioned between the seventh metal layer and the eighth metal layer; the first extraction pole resonator and the second extraction pole resonator are positioned on the third metal layer, the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator are both positioned on the sixth metal layer, a signal input feeder arranged on the third metal layer is connected with the center of the first extraction pole resonator, and a signal output feeder arranged on the third metal layer is connected with the center of the second extraction pole resonator.
Further, a feed structure is arranged on the third metal layer, a signal is connected with the center of the first extraction pole resonator through signal input feed lines at two sides of the feed structure, is coupled to the first quarter-wavelength step impedance resonator through a coupling hole, and is coupled to the second extraction pole resonator through a coupling hole after being coupled between the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator.
Still further, the first extraction pole resonator and the first quarter-wave step impedance resonator are coupled through coupling holes in the fourth metal layer and the fifth metal layer;
The coupling between the first extraction pole resonator and the first quarter-wavelength step impedance resonator is vertical coupling, the coupling between the first extraction pole resonator and the first quarter-wavelength step impedance resonator comprises electrical coupling and magnetic coupling, and the electrical coupling strength is greater than the magnetic coupling strength.
Still further, the second extraction pole resonator and the second quarter-wave step impedance resonator are coupled through coupling holes in the seventh metal layer and the eighth metal layer;
The coupling between the second extraction pole resonator and the second quarter-wavelength step impedance resonator is vertical coupling, and the second extraction pole resonator and the second quarter-wavelength step impedance resonator comprise electric coupling and magnetic coupling, and the electric coupling strength is greater than the magnetic coupling strength.
Still further, the coupling between the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator is horizontal coupling, and the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator include electrical coupling and magnetic coupling, and the electrical coupling strength is greater than the magnetic coupling strength.
Still further, a row of metallized through holes is disposed between the first extraction pole resonator and the second extraction pole resonator.
Still further, the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the fourth dielectric substrate are connected through fixing holes by metal screws.
The invention has the beneficial effects that:
(1) The present invention builds filters with substrate integrated coaxial lines, but does not use only horizontal coupling, unlike integrated coaxial filters that are commonly available on the market. The invention uses four layers of printed circuit substrates, and simultaneously uses two coupling modes of horizontal coupling and vertical coupling (the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator are coupled through electromagnetic hybrid coupling and are horizontally coupled, the first extraction pole resonator and the first quarter-wavelength step impedance resonator are coupled through electromagnetic hybrid coupling and are vertically coupled, and the first extraction pole resonator and the first quarter-wavelength step impedance resonator are coupled through electromagnetic hybrid coupling and are vertically coupled), so that the size of the invention is far smaller than that of other coaxial filters integrated by substrates with the same frequency under the same frequency, thereby realizing miniaturization and saving half size.
(2) The present invention uses a first extraction pole resonator and a second extraction pole resonator, which are capable of generating a transmission pole and a transmission zero to the left of the resonance point. The invention uses four resonators, a first extraction pole resonator, a second extraction pole resonator, a first quarter-wavelength step impedance resonator and a second quarter-wavelength step impedance resonator, two of which are extraction pole resonators. And unlike the traditional extraction pole resonator which is connected in a wiring way in a filter, the invention transmits signals of the extraction pole resonator and other resonators in a vertical coupling way. In the invention, electromagnetic hybrid coupling is used between adjacent resonators, and the electric coupling strength between the resonators is larger than that of magnetic coupling, so that the electric coupling is dominant coupling, three zero points are generated on the left side of a passband, and the suppression of a frequency band of DC-0.9 times of the center frequency is superior to-48 dB.
(3) The filter provided by the invention uses the shielding cavity with the substrate integrated coaxial structure, reduces radiation loss of the filter, and enables the grounding of the filter circuit to be more flexible. The filter uses the pole resonator to generate zero without complex cross coupling, thereby reducing the complexity of design and the size of the filter to a certain extent. The filter uses the extraction pole resonator, but is not connected in a wiring way in the filter like a common extraction pole resonator, but is transmitted in a vertical coupling way. The vertical configuration makes the filter only 0.31λg×0.14λg in size. The filter uses electromagnetic hybrid coupling among the first extraction pole resonator, the second extraction pole resonator, the first quarter-wavelength step impedance resonator and the second quarter-wavelength step impedance resonator, so that three zero points are generated on the left side of a passband under the condition that the filter structure is symmetrical, and the suppression on the left side of the passband is greatly improved. The three zero points of the filter are all movable, so that the filter has flexible response and can meet different engineering requirements. The three zero points of the response of the invention can be regulated and controlled independently, and can meet different inhibition requirements for the filter.
Drawings
Fig. 1 is a schematic side view of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 2 is a perspective view of a first layer substrate of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 3 is a perspective view of a second layer substrate of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 4 is a perspective view of a third layer substrate of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 5 is a perspective view of a fourth layer substrate of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 6 is a coupling topology of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Fig. 7 is a response diagram of a 5G substrate integrated coaxial filter based on an extraction pole resonator.
Wherein, 1-first dielectric substrate, 2-second dielectric substrate, 3-third dielectric substrate, 4-fourth dielectric substrate, 5-first metal layer, 6-second metal layer, 7-third metal layer, 8-fourth metal layer, 9-fifth metal layer, 10-sixth metal layer, 11-seventh metal layer, 12-eighth metal layer, 13-first extraction pole resonator, 14-second extraction pole resonator, 15-first quarter wavelength step impedance resonator, 16-second quarter wavelength step impedance resonator, 17-fixed hole, 18-metalized through hole, 19-signal input feed line, 20-signal output feed line.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Examples
In this embodiment, as shown in fig. 1,2,3, 4, 5 and 6, the present invention provides a 5G substrate integrated coaxial filter based on an extraction pole resonator, which includes a first dielectric substrate 1, a second dielectric substrate 2, a third dielectric substrate 3, a fourth dielectric substrate 4, a first metal layer 5, a second metal layer 6, a third metal layer 7, a fourth metal layer 8, a fifth metal layer 9, a sixth metal layer 10, a seventh metal layer 11, an eighth metal layer 12, a first extraction pole resonator 13, a second extraction pole resonator 14, a first quarter-wavelength step impedance resonator 15 and a second quarter-wavelength step impedance resonator 16;
The first dielectric substrate 1, the second dielectric substrate 2, the third dielectric substrate 3 and the fourth dielectric substrate 4 are sequentially arranged from top to bottom, the first metal layer 5, the second metal layer 6, the third metal layer 7, the fourth metal layer 8, the fifth metal layer 9, the sixth metal layer 10, the seventh metal layer 11 and the eighth metal layer 12 are sequentially arranged from top to bottom, the first dielectric substrate 1 is positioned between the first metal layer 5 and the second metal layer 6, the second dielectric substrate 2 is positioned between the third metal layer 7 and the fourth metal layer 8, the third dielectric substrate 3 is positioned between the fifth metal layer 9 and the sixth metal layer 10, and the fourth dielectric substrate 4 is positioned between the seventh metal layer 11 and the eighth metal layer 12; the first extraction pole resonator 13 and the second extraction pole resonator 14 are located on the third metal layer 7, the first quarter-wavelength step impedance resonator 15 and the second quarter-wavelength step impedance resonator 16 are both located on the sixth metal layer 10, a signal input feeder 19 disposed on the third metal layer 7 is connected with the center of the first extraction pole resonator 13, and a signal output feeder 20 disposed on the third metal layer 7 is connected with the center of the second extraction pole resonator 14.
The third metal layer 7 is provided with a feed structure, a signal is connected with the center of the first extraction pole resonator 13 through a signal input feeder line 19 at two sides of the feed structure, and the signal is coupled to the first quarter-wavelength step impedance resonator 15 through a coupling hole, coupled between the first quarter-wavelength step impedance resonator 15 and the second quarter-wavelength step impedance resonator 16, coupled to the second extraction pole resonator 14 through the coupling hole, and output through a signal output feeder line 20.
The first extraction pole resonator 13 and the first quarter-wave step impedance resonator 15 are coupled through coupling holes in the fourth metal layer 8 and the fifth metal layer 9; the coupling between the first extraction pole resonator 13 and the first quarter wave step impedance resonator 15 is vertical coupling, the coupling between the first extraction pole resonator 13 and the first quarter wave step impedance resonator 15 comprises electrical coupling and magnetic coupling, and the electrical coupling strength is greater than the magnetic coupling strength.
Coupling between the second extraction pole resonator 14 and the second quarter-wave step impedance resonator 16 is performed through coupling holes in the seventh metal layer 11 and the eighth metal layer 12; the coupling between the second extraction pole resonator 14 and the second quarter wave step impedance resonator 16 is vertical coupling, the second extraction pole resonator 14 and the second quarter wave step impedance resonator 16 include electrical coupling and magnetic coupling, and the electrical coupling strength is greater than the magnetic coupling strength.
The coupling between the first quarter-wave step impedance resonator 15 and the second quarter-wave step impedance resonator 16 is horizontal coupling, and the electrical coupling and the magnetic coupling between the first quarter-wave step impedance resonator 15 and the second quarter-wave step impedance resonator 16 are included, and the electrical coupling strength is greater than the magnetic coupling strength.
A row of metallized through holes 18 is arranged between the first extraction pole resonator 13 and the second extraction pole resonator 14. The first dielectric substrate 1, the second dielectric substrate 2, the third dielectric substrate 3 and the fourth dielectric substrate 4 are connected through fixing holes 17 by metal screws.
In this embodiment, the 5G substrate integrated filter based on the extraction pole resonator has a fourth-order bandpass response, and is composed of four layers of substrates (a first dielectric substrate 1, a second dielectric substrate 2, a third dielectric substrate 3, and a fourth dielectric substrate 4), eight layers of metallic copper (a first metal layer 5, a second metal layer 6, a third metal layer 7, a fourth metal layer 8, a fifth metal layer 9, a sixth metal layer 10, a seventh metal layer 11, and an eighth metal layer 12), two extraction pole resonators (a first extraction pole resonator 13 and a second extraction pole resonator 14), two quarter-wavelength step impedance resonators (a first quarter-wavelength step impedance resonator 15 and a second quarter-wavelength step impedance resonator 16), and a metallized via 18. The four layers of substrates are fixed together through fixing holes 17 by metal screws, and the first dielectric substrate 1, the second dielectric substrate 2, the third dielectric substrate 3 and the fourth dielectric substrate 4 are arranged in sequence from top to bottom.
In this embodiment, the 5G substrate integrated filter based on the pole resonator provided by the invention provides a high-performance implementation manner of the filter. The feed structure is located in the third metal layer 7 and the signal is connected to the resonator first extraction pole resonator 13 via signal input feed lines 19 on both sides of the structure and coupled to the first quarter wave step impedance resonator 15 via coupling holes. After being coupled between the first quarter wave step impedance resonator 15 and the second quarter wave step impedance resonator 16, the signal is coupled to the second extraction pole resonator 14 through a coupling hole and output through a signal output feed line 20. A row of metallized through holes 18 is arranged between the first extraction pole resonator 13 and the second extraction pole resonator 14, and no signal is transmitted.
In the present embodiment, as shown in fig. 1,2, 3, 4 and 5, the first extraction pole resonator 13 and the second extraction pole resonator 14 are located in the third metal layer; a first quarter wave step impedance resonator 15 and a second quarter wave step impedance resonator 16 are located in the sixth metal layer. The first extraction pole resonator 13 and the second extraction pole resonator 14 are extraction pole resonators, and can be equivalent to a resonance point and a non-resonance point, and the response characteristic is accompanied by a pole and a zero. The first quarter wave step impedance resonator 15 and the second quarter wave step impedance resonator 16 are both quarter wave step impedance resonators, and the grounding effect is achieved by connecting a grounding metal. The first quarter-wave step impedance resonator 15 and the second quarter-wave step impedance resonator 16 are coupled in an electromagnetic hybrid coupling mode, a zero point is realized, and the generated zero point is positioned at the left side of the passband by controlling the electric field intensity to be larger than the magnetic field intensity. The first extraction pole resonator 13 and the first quarter wave step impedance resonator 15 are coupled by coupling holes in the fourth metal layer 8 and the fifth metal layer 9. Unlike prior art extraction pole resonators, which are often connected by a feed to transfer signals, the present invention uses a vertically coupled configuration to couple between the first extraction pole resonator 13 and the first quarter wave step impedance resonator 15. Both forms of coupling, electrical and magnetic, are introduced between the first extraction pole resonator 13 and the first quarter wave step impedance resonator 15 and the electric field strength is controlled to be greater than the magnetic field strength. Due to the structural symmetry, the coupling between the second quarter wave step impedance resonator 16 and the second extraction pole resonator 14 is identical to the coupling between the first extraction pole resonator 13 and the first quarter wave step impedance resonator 15. The signal input feeder 19 of the source finger filter, i.e. where the electrical signal enters the filter; the load refers to the signal output feed line 20 of the filter, i.e. where the electrical signal leaves the filter.
In this embodiment, as shown in fig. 6, the present invention uses electromagnetic hybrid coupling between the first extraction pole resonator 13 and the first quarter-wavelength step impedance resonator 15, and the second quarter-wavelength step impedance resonator 16 and the second extraction pole resonator 14 to separate the resonator zeros carried by the extraction pole resonators, creating two zeros on the left side of the passband. Together with the zero points brought about by the electromagnetic hybrid coupling between the first 15 and second 16 quarter-wave step impedance resonators, three zero points are brought about on the left side of the filter and the frequency of the three zero points can be adjusted according to the suppression requirements. In the invention, the coupling mode among the four resonators (the first extraction pole resonator 13, the second extraction pole resonator 14, the first quarter-wavelength step impedance resonator 15 and the second quarter-wavelength step impedance resonator 16) is a hybrid coupling formed by electric coupling and magnetic coupling. The position of the zero point can be adjusted by controlling the coupling strength of the magnetic field by controlling the size of the coupling window between the two resonators.
In this example, as shown in fig. 6, which is a coupling topological diagram of the present invention, N represents a non-resonant node, a black solid circle represents a resonant node, and the first extraction pole resonator 13 and the second extraction pole resonator 14 are both equivalent to a combination of one resonant node and one non-resonant node; the first quarter wave step impedance resonator 15 and the second quarter wave step impedance resonator 16 are each equivalent to one resonant node. The connecting lines among the nodes represent the coupling relation among the nodes. Two paths of coupling paths are arranged between the extraction pole resonator and the quarter-wavelength step impedance resonator, and one coupling path is arranged between the two quarter-wavelength step impedance resonators.
In this example, as shown in fig. 7, the response of the present invention is schematically represented by the S parameter (dB) on the ordinate, the frequency (GHz) on the abscissa, the test curve on the broken line, the simulation curve on the solid line, the forward transmission coefficient on the S21, the center frequency of the present invention is 4.82GHz, the present invention is located in the N79 frequency band, the relative bandwidth is 9%, the minimum insertion loss in the band is-1.5 dB, the rejection of the upper stop band-20 dB out-of-band reaches 2.27f0 (f 0 is the center frequency of the filter), and the rejection on the left side of the pass band is-48 dB (DC-0.9 f 0). S11 is an input reflection coefficient, and shows that the echo of the invention is better than-15.4 dB.
In the embodiment, the dielectric substrate used by the band-pass filter has a dielectric constant of 2.2 and a loss tangent of 0.000191, and the thickness of the dielectric substrate used by the band-pass filter is 0.508mm; the thickness of the metallic copper layer used in the invention is 0.018mm. The filter electrical dimensions were 0.31 λg×0.14 λg.
Based on the performance analysis, the filter provided by the invention has the advantages of small size and flexible response. This gives the present invention a stronger advantage over other types of products on the market, which is advantageous for mass production and application.
Claims (4)
1. The 5G substrate integrated coaxial filter based on the extraction pole resonator is characterized by comprising a first dielectric substrate (1), a second dielectric substrate (2), a third dielectric substrate (3), a fourth dielectric substrate (4), a first metal layer (5), a second metal layer (6), a third metal layer (7), a fourth metal layer (8), a fifth metal layer (9), a sixth metal layer (10), a seventh metal layer (11), an eighth metal layer (12), a first extraction pole resonator (13), a second extraction pole resonator (14), a first quarter-wavelength step impedance resonator (15) and a second quarter-wavelength step impedance resonator (16);
The first dielectric substrate (1), the second dielectric substrate (2), the third dielectric substrate (3) and the fourth dielectric substrate (4) are sequentially arranged from top to bottom, the first metal layer (5), the second metal layer (6), the third metal layer (7), the fourth metal layer (8), the fifth metal layer (9), the sixth metal layer (10), the seventh metal layer (11) and the eighth metal layer (12) are sequentially arranged from top to bottom, the first dielectric substrate (1) is positioned between the first metal layer (5) and the second metal layer (6), the second dielectric substrate (2) is positioned between the third metal layer (7) and the fourth metal layer (8), the third dielectric substrate (3) is positioned between the fifth metal layer (9) and the sixth metal layer (10), and the fourth dielectric substrate (4) is positioned between the seventh metal layer (11) and the eighth metal layer (12); the first extraction pole resonator (13) and the second extraction pole resonator (14) are positioned on the third metal layer (7), the first quarter-wavelength step impedance resonator (15) and the second quarter-wavelength step impedance resonator (16) are both positioned on the sixth metal layer (10), a signal input feeder line (19) arranged on the third metal layer (7) is connected with the center of the first extraction pole resonator (13), and a signal output feeder line (20) arranged on the third metal layer (7) is connected with the center of the second extraction pole resonator (14);
The first extraction pole resonator (13) and the first quarter-wave step impedance resonator (15) are coupled through coupling holes in the fourth metal layer (8) and the fifth metal layer (9);
The coupling between the first extraction pole resonator (13) and the first quarter-wavelength step impedance resonator (15) is vertical coupling, the coupling between the first extraction pole resonator (13) and the first quarter-wavelength step impedance resonator (15) comprises electric coupling and magnetic coupling, and the electric coupling strength is greater than the magnetic coupling strength;
coupling is carried out between the second extraction pole resonator (14) and the second quarter-wave step impedance resonator (16) through coupling holes in the seventh metal layer (11) and the eighth metal layer (12);
The coupling between the second extraction pole resonator (14) and the second quarter-wavelength step impedance resonator (16) is vertical coupling, the second extraction pole resonator (14) and the second quarter-wavelength step impedance resonator (16) comprise electric coupling and magnetic coupling, and the electric coupling strength is greater than the magnetic coupling strength;
The coupling between the first quarter-wavelength step impedance resonator (15) and the second quarter-wavelength step impedance resonator (16) is horizontal coupling, and the first quarter-wavelength step impedance resonator (15) and the second quarter-wavelength step impedance resonator (16) comprise electric coupling and magnetic coupling, and the electric coupling strength is larger than the magnetic coupling strength.
2. The 5G substrate integrated coaxial filter based on an extraction pole resonator according to claim 1, characterized in that a feeding structure is arranged on the third metal layer (7), a signal is connected with the center of the first extraction pole resonator (13) through a signal input feeder line (19) at two sides of the feeding structure, the signal is coupled to the first quarter wavelength step impedance resonator (15) through a coupling hole, is coupled between the first quarter wavelength step impedance resonator (15) and the second quarter wavelength step impedance resonator (16), and is finally coupled to the second extraction pole resonator (14) through the second quarter wavelength step impedance resonator (16).
3. The 5G substrate integrated coaxial filter based on extraction pole resonators according to claim 2, characterized in that a row of metallized through holes (18) is provided between the first extraction pole resonator (13) and the second extraction pole resonator (14).
4. The 5G substrate integrated coaxial filter based on the extraction pole resonator according to claim 3, wherein the first dielectric substrate (1), the second dielectric substrate (2), the third dielectric substrate (3) and the fourth dielectric substrate (4) are connected by metal screws through fixing holes (17).
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