Quasi-plane band elimination filter based on wide and narrow side hybrid coupling structure

Abstract

The embodiment of the invention provides a quasi-plane band elimination filter based on a wide and narrow side hybrid coupling structure, and relates to the technical field of filters, the quasi-plane band elimination filter comprises a rectangular micro coaxial line, a conductor inner core and a shell, the conductor inner core is arranged in the shell, a gap exists between the conductor inner core and the shell, and the gap is filled with an air medium. The plurality of resonator structures are positioned between the conductor inner core and the shell, are arranged at the top and the side part of the conductor inner core, and are used for loading the rectangular micro coaxial line through electromagnetic coupling; and an opening is formed in a shell area opposite to the resonator structure arranged at the top of the conductor inner core on the shell. And the conductor inner core and the shell of the rectangular micro coaxial line and the plurality of resonator structures are all made of copper. According to the embodiment of the invention, the requirements of miniaturization, light weight and high integration level can be met, and the filtering performance is ensured.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of filter, in particular, to a quasi-planar band-stop filter based on a wide-narrow edge hybrid coupling structure. BACKGROUND

[0002] With the rapid development of modern wireless communication and electronic systems (such as 5G / 6G mobile communication, satellite communication, radar and electronic countermeasure systems), the spectrum resources are increasingly crowded, and the electromagnetic environment is increasingly complex. The electromagnetic interference between systems and channels is increasingly serious, which reduces the sensitivity of the receiver, causes signal distortion, and even may cause the performance failure of the entire system. Therefore, how to efficiently filter out unwanted interference signals in a specific frequency band while ensuring the low-loss transmission of useful signals has become one of the challenges of the design of radio frequency front-end circuits. As a key device of the radio frequency front-end, the band-stop filter can selectively attenuate interference signals in a specific frequency range and allow useful signals to pass normally, and plays an irreplaceable role in improving the signal-to-noise ratio and the anti-interference ability of the system.

[0003] Traditional band-stop filters can be implemented by using transmission line structures such as microstrip lines and waveguides and corresponding processes. Among them, the microstrip line band-stop filter is widely used because it has the advantages of easy integration, low processing cost, small size, etc. However, in the high frequency band such as millimeter wave, the loss is large, the Q value is low, the power capacity is limited, and radiation loss and electromagnetic crosstalk are easily generated, which leads to a decline in filtering performance. Although the waveguide cavity band-stop filter has the characteristics of high Q value and high power capacity, it can improve the performance in the high frequency band to a certain extent, but it is bulky and heavy, and it is difficult to realize board-level interconnection integration with planar circuits, which cannot meet the requirements of miniaturization, light weight and high integration. SUMMARY

[0004] Embodiments of the present application provide a quasi-planar band-stop filter based on a wide-narrow edge hybrid coupling structure, which can meet the requirements of miniaturization, light weight and high integration, and also ensures the filtering performance.

[0005] The application provides a quasi-planar band-stop filter based on a wide-narrow edge mixed coupling structure, which comprises a rectangular micro coaxial line, a plurality of resonator structures and a shell.

[0006] In a possible implementation, each resonator structure is a quarter-wavelength resonator structure based on stepped impedance.

[0007] In a possible implementation, the quarter-wavelength resonator structure based on stepped impedance comprises a first impedance line and a second impedance line, wherein: the impedance of the first impedance line is greater than the impedance of the second impedance line; a first end of the first impedance line is connected to the shell, a second end of the first impedance line is connected to a first end of the second impedance line, and a second end of the second impedance line is separated from the shell; wherein the projection of the connection point of the first end of the first impedance line in each resonator structure in the plurality of resonator structures on the central axis of the length direction of the conductor inner core is sequentially arranged along the central axis.

[0008] In a possible implementation, the second impedance line in the resonator structure arranged on the top of the conductor inner core is a right-angle bending structure. The bending direction of the second impedance line in some resonator structures arranged on the top of the conductor inner core is opposite to the bending direction of the second impedance line in other resonator structures arranged on the top of the conductor inner core.

[0009] In a possible implementation, the projection of the resonator structure arranged on the side of the conductor inner core on the top of the shell covers a range along the length direction of the conductor inner core, which is within the total coverage range of the projection of the resonator structure arranged on the top of the conductor inner core on the top of the shell along the same direction.

[0010] In one possible implementation, the plurality of resonator structures include a first resonator structure, a second resonator structure, a third resonator structure, and a fourth resonator structure; The first resonator structure, the second resonator structure, and the third resonator structure are disposed on the top of the conductor core and arranged sequentially on the top of the conductor core along the length direction of the conductor core. The fourth resonator structure is disposed on the side of the conductor core.

[0011] In one possible implementation, the quasi-planar bandstop filter further includes a plurality of first dielectric support strips; The plurality of first dielectric support strips are arranged periodically at a preset interval, and each first dielectric support strip penetrates the conductor core, with both ends of each first dielectric support strip embedded in the inner wall of the housing.

[0012] In one possible implementation, the quasi-planar bandstop filter further includes a plurality of second dielectric support bars and a plurality of bases; The plurality of base stations correspond one-to-one with the resonator structure disposed on the top of the conductor core; The first end of each base is integrally formed and located on the lower side of the second end of the second impedance line in the corresponding resonator structure; The plurality of second medium support bars correspond one-to-one with the plurality of bases; Each of the bases has a protruding positioning part at its second end, and each of the second medium support bars has a positioning hole on its upper side that matches the positioning part; By embedding the positioning part into the positioning hole, the second end of the corresponding base is connected to the upper side of the second medium support strip; Each of the second medium support bars is embedded in the inner wall of the housing on its left and right sides respectively.

[0013] In one possible implementation, the housing is also provided with multiple release holes.

[0014] The beneficial effects of the quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure in the embodiments of this application are: The space between the conductor core and the shell of the rectangular microcoaxial cable is filled with air, which reduces dielectric loss. The conductor core, shell, and multiple resonators are all made of highly conductive copper, which reduces conductor ohmic loss and forms a closed electromagnetic shielding space through the all-copper shell, preventing electromagnetic field leakage (eliminating radiation loss), shielding external interference, and suppressing electromagnetic crosstalk. These features work synergistically to improve energy transmission efficiency and power capacity to optimize filtering performance. Furthermore, the air dielectric and the structure of the conductor core and shell facilitate TEM wave transmission, and TEM waves have weak dispersion in a uniform air medium. Combined with the advantages of low dielectric loss, low conductor ohmic loss, and no radiation loss, low transmission loss, high isolation, and low dispersion electrical performance can be achieved, reducing transmission loss of high-frequency signals such as millimeter waves.

[0015] Furthermore, since losses can be reduced, and the quality factor (Q value) of a resonator directly depends on the ratio of energy storage to loss, the lower the loss, the higher the Q value. Therefore, it has a high Q value characteristic, which can prevent the attenuation of filtering performance and improve signal transmission efficiency and quality.

[0016] Furthermore, compared to waveguide cavity bandstop filters, this application utilizes a rectangular micro-coaxial line to construct the resonator structure, reducing size and weight, and facilitating board-level interconnection and integration with planar circuits. Since multiple resonator structures are located on the top and sides of the conductor core, compared to having them all located on the top, the size is further reduced. This satisfies the requirements of miniaturization, lightweight design, and high integration.

[0017] Furthermore, the rectangular micro coaxial line itself already possesses quasi-planar characteristics. In addition, the multiple resonator structures are set on the top and sides of the conductor core in the rectangular micro coaxial line, which greatly increases the overall thickness, making the overall shape of the device closer to a plane, thus possessing quasi-planar characteristics. Attached Figure Description

[0018] Figure 1 A perspective view of a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure provided in an embodiment of this application, viewed from above. Figure 2 A perspective view of a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure provided in an embodiment of this application; Figure 3 A top view of a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure provided in an embodiment of this application; Figure 4 A schematic diagram of the conductor core, multiple resonators, and dielectric support strip provided in an embodiment of this application; Figure 5 Provided for the embodiments of this application Figure 3 A cross-sectional view along the AA direction; Figure 6 Provided for the embodiments of this application Figure 3 A cross-sectional view along the BB direction; Figure 7 This is a schematic diagram of the structure of the second medium support strip and the base provided in the embodiments of this application; Figure 8 A perspective view of the second medium support strip and the base provided in the embodiments of this application; Figure 9 The above is a simulation diagram provided for an embodiment of this application. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" or "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, which will not be elaborated further here.

[0024] like Figures 1-8 As shown, this application embodiment provides a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure. This quasi-planar bandstop filter may include: a rectangular micro-coaxial line 1 and multiple resonator structures 2. Wherein: The rectangular micro coaxial cable 1 may include a conductor core 11 and a housing 12. The conductor core 11 is disposed inside the housing 12 and there is a gap between the conductor core 11 and the housing 12. The gap is filled with a medium, which is air. The longitudinal central axis of the conductor core 11 coincides with the longitudinal central axis of the housing 12.

[0025] The rectangular micro coaxial cable 1 also has an input terminal 3 and an output terminal 4, which can be connected to external components.

[0026] Multiple resonator structures 2 are located between the conductor core 11 and the shell 12 and are disposed on the top and side of the conductor core 11, and are loaded onto the rectangular micro coaxial line 1 through electromagnetic coupling.

[0027] A portion of the multiple resonator structures 2 is disposed on the top of the conductor core 11 to achieve wide-side coupling, while another portion of the multiple resonator structures 2 is disposed on the side of the conductor core 11 to achieve narrow-side coupling. Specifically, the other portion of the multiple resonator structures 2 consists of all the remaining portions of the multiple resonator structures 2 except for the portion in question.

[0028] For example, the plurality of resonator structures 2 may include a first resonator structure 21, a second resonator structure 22, a third resonator structure 23 and a fourth resonator structure 24; The first resonator structure 21, the second resonator structure 22, and the third resonator structure 23 are disposed on the top of the conductor core 11 and arranged sequentially along the length of the conductor core 11 to achieve wide-side coupling. The fourth resonator structure 24 is disposed on the side of the conductor core 11 to achieve narrow-side coupling.

[0029] An opening 9 is provided on the housing 12 in the housing area opposite to the resonator structure disposed on the top of the conductor core 11.

[0030] The conductor core 11 and shell 12 of the rectangular micro coaxial line 1, as well as the multiple resonator structures 2, are all made of copper.

[0031] The radio frequency signal is input to a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure via input terminal 3 of the rectangular micro-coaxial line 1, and output from output terminal 4 of the rectangular micro-coaxial line 1 after being filtered by the quasi-planar bandstop filter based on the wide-narrow side hybrid coupling structure. It should be noted that noise is transmitted to ground through multiple resonators 2.

[0032] Multiple resonator structures 2 are designed based on rectangular micro-coaxial lines 1. For example, the quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure obtained by this design can have a thickness of 200 μm, a width of 405 μm, and a length of 5553 μm.

[0033] It should be noted that the basic structure of this embodiment is a rectangular micro-coaxial line 1, which can be fabricated using electrochemical additive manufacturing technology. The rectangular micro-coaxial line 1 in this embodiment can have 9 layers in its manufacturing process, with each layer being 100 μm thick. The rectangular micro-coaxial line 1 has a thickness of only 900 μm and can be considered a quasi-planar structure. The transmitted electromagnetic waves are TEM waves, exhibiting extremely low loss.

[0034] As shown above, the medium filled in the gap between the conductor core 11 and the shell 12 of the rectangular micro-coaxial cable 1 is air, which reduces dielectric loss. The conductor core 11, the shell 12, and the multiple resonators 2 are all made of copper with high conductivity, which not only reduces conductor ohmic loss, but also forms a closed electromagnetic shielding space through the all-copper shell, preventing electromagnetic field leakage (eliminating radiation loss), shielding external interference, and suppressing electromagnetic crosstalk. These features work together to improve energy transmission efficiency and power capacity to optimize filtering performance. Furthermore, the structure of the air medium and the conductor core and shell is conducive to TEM wave transmission, and the TEM wave has a weak dispersion effect in a uniform air medium. Combined with the advantages of low dielectric loss, low conductor ohmic loss, and no radiation loss, it can achieve electrical performance with low transmission loss, high isolation, and low dispersion, reducing the transmission loss of high-frequency signals such as millimeter waves.

[0035] Furthermore, since losses can be reduced, and the quality factor (Q value) of a resonator directly depends on the ratio of energy storage to loss, the lower the loss, the higher the Q value. Therefore, it has a high Q value characteristic, which can prevent the attenuation of filtering performance and improve signal transmission efficiency and quality.

[0036] Furthermore, compared to waveguide cavity bandstop filters, this application constructs a resonator structure 2 based on a rectangular micro-coaxial line 1, which reduces volume and weight, and facilitates board-level interconnection and integration with planar circuits. Since multiple resonator structures 2 are located on the top and sides of the conductor core 11, compared to all being located on the top, the volume is further reduced. Thus, the requirements for miniaturization, lightweight design, and high integration are met.

[0037] Furthermore, the rectangular micro coaxial line 1 itself already possesses quasi-planar characteristics. In addition, the multiple resonator structures 2 are set on the top and sides of the conductor core 11 in the rectangular micro coaxial line 1, which greatly increases the overall thickness, making the overall shape of the device closer to a plane, thus possessing quasi-planar characteristics.

[0038] In some embodiments, each resonator structure 2 is a quarter-wavelength resonator structure based on stepped impedance.

[0039] Compared to non-stepped impedance structures (such as uniform impedance structures), stepped impedance structures, by designing combinations of different impedance segments (high-resistance segments and low-resistance segments), can adjust the current distribution through impedance abrupt changes and increase the effective electrical length while achieving the same resonant frequency or filtering performance, thereby shortening the physical size and further reducing the overall volume. Therefore, in the embodiments of this application, each resonator structure 2 adopts a quarter-wavelength resonator structure based on stepped impedance, which, compared to non-stepped impedance structures, suggests that the volume should not be reduced.

[0040] For example, a quarter-wavelength resonator structure based on stepped impedance may include a first impedance line 211 and a second impedance line 212, wherein the impedance of the first impedance line 211 is greater than the impedance of the second impedance line 212. That is, the first impedance line 211 is a high-impedance line, and the second impedance line 212 is a low-impedance line. For example, the thickness of both the low-impedance line and the high-impedance line is 100 μm, the width of the high-impedance line is 200 μm, and the width of the low-impedance line is 300 μm. The narrower the width of the rectangular micro-coaxial line 1, the higher the characteristic impedance.

[0041] The first end of the first impedance line 211 is connected to the housing 12 to achieve a short circuit. The second end of the first impedance line 211 is connected to the first end of the second impedance line 212. The second end of the second impedance line 212 is separated from the housing 12 to achieve an open circuit.

[0042] For example, the contact area (i.e. the area of ​​the connection point) between the first end of the first impedance line 211 and the housing 12 is 120*120um.

[0043] The connection points of the first end of the first impedance line 211 in each of the multiple resonator structures 2 and the shell, projected onto the central axis of the conductor core 11 along the length direction, are arranged sequentially along the central axis to achieve a correct response.

[0044] In some embodiments, the second impedance line in the resonator structure disposed at the top of the conductor core 11 is a right-angle bent structure.

[0045] The bending direction of the second impedance line in a portion of the resonator structure 2 located at the top of the conductor core 11 is opposite to the bending direction of the second impedance line in another portion of the resonator structure 2 located at the top of the conductor core 11.

[0046] For example, the first resonator structure 21, the second resonator structure 22, and the third resonator structure 23 are disposed on the top of the conductor core 11. The second impedance lines in the first resonator structure 21, the second resonator structure 22, and the third resonator structure 23 are all right-angle bent structures, and the bending direction of the second impedance line in the first resonator structure 21 is opposite to the bending direction of the second impedance lines in the second resonator structure 22 and the third resonator structure 23.

[0047] Due to the presence of stepped impedance, resonator structure 2 achieves miniaturization. Therefore, the physical length of resonator structure 2 is less than one-quarter of the wavelength corresponding to the target center frequency (each resonator structure has its own frequency, distributed sequentially to achieve a wide and flat stopband). For example, the lengths of the first resonator structure 21, the second resonator structure 22, the third resonator structure 23, and the fourth resonator structure 24 are 801+1570=2371um, 754+1608=2362um, 628+1602=2230um, and 1039+1123=2162um, respectively. In the calculation formula, the first value represents the length of the first impedance line, and the second value represents the length of the second impedance line.

[0048] Obviously, the size is further reduced because the second impedance line has a right-angle bend structure. Furthermore, the structural stability is increased because the bending direction of the second impedance line in one part of the resonator structure 2 located at the top of the conductor core 11 is opposite to that in another part of the resonator structure 2 located at the top of the conductor core 11.

[0049] It should be noted that the length of the quarter-wavelength resonator structure based on stepped impedance is not limited to the above values ​​and can be adjusted according to the design goals and requirements of different frequency bands. The design length of the quarter-wavelength resonator structure based on stepped impedance can be initially determined by the following formula: (1) (2) (3) in, The characteristic impedance of the first impedance line. This is the characteristic impedance of the second impedance line. The electrical length of the first impedance line. The electrical length of the second impedance line. This is the actual physical length of the first impedance line. This is the actual physical length of the second impedance line. For the desired frequency point that generates a transmission zero, This indicates the speed at which electromagnetic waves propagate along a transmission line. Less than the speed of light, c.

[0050] It should be noted that the design length of the quarter-wavelength resonator structure based on stepped impedance obtained by theoretical calculation has errors, and there are a lot of parasitic effects in 3D electromagnetic software simulation. Therefore, the final length needs to be obtained by parameter optimization through 3D simulation software.

[0051] In some embodiments, the projection of the resonator structure disposed on the side of the conductor core 11 onto the top of the housing 12 covers the length direction of the conductor core 11, and the projection of the resonator structure disposed on the top of the conductor core 11 onto the top of the housing 12 covers the total area in the same direction. This further reduces the volume.

[0052] In some embodiments, the quasi-planar bandstop filter based on the wide-narrow side hybrid coupling structure further includes a plurality of first dielectric support strips 5.

[0053] Multiple first dielectric support bars 5 are arranged periodically at a preset interval, and each first dielectric support bar 5 penetrates the conductor core 11. Both ends of each first dielectric support bar 5 are embedded in the inner wall of the housing 12 to provide support and positioning, while also ensuring the relative position between the conductor core 11 and the inner wall of the housing 12.

[0054] It should be noted that if the multiple first dielectric support strips 5 are arranged too densely, the electromagnetic loss will be too high; if they are too sparse, the support for the conductor core 11 will be insufficient, affecting the structure and strength of the device. Therefore, the spacing of the arrangement can be set according to actual needs.

[0055] In some embodiments, the quasi-planar bandstop filter based on the wide-narrow side hybrid coupling structure further includes a plurality of second dielectric support bars 6 and a plurality of bases 7.

[0056] Multiple base stations 7 correspond one-to-one with the resonator structure located on top of the conductor core 11.

[0057] The first end of each base 7 is integrally formed and positioned below the second end of the second impedance line in the corresponding resonator structure. Multiple second dielectric support bars 6 correspond one-to-one with multiple base 7s; each base 7 has a protruding positioning part 71 at its second end, and each second dielectric support bar 6 has a positioning hole on its upper side that matches the positioning part 71. By inserting the positioning part 71 into the positioning hole, the second end of the corresponding base 7 is connected to the upper side of the second dielectric support bar 6. The left and right sides of each second dielectric support bar 6 are respectively embedded in the inner wall of the housing 12 to provide support and stability.

[0058] For example, the base 7 can be a square base with a height of 180um and a width and length of 160um*160um, and the positioning part 71 can be cylindrical with a height of 20um and a diameter of 60um.

[0059] In some embodiments, the housing 12 is further provided with a plurality of release holes 8. For example, the plurality of release holes 8 may be arranged periodically on the housing 12.

[0060] In the electrochemical additive manufacturing process, the rectangular micro coaxial line 1 needs to have multiple release holes 8. The multiple release holes 8 can be periodically arranged on the housing 12 to release the photoresist used in the manufacturing process.

[0061] It should be noted that defects can also serve as large release holes to better release photoresist. In actual design, the number of release holes 8 should not be too many or too few. Too many will cause electromagnetic leakage, while too few will lead to incomplete removal of photoresist, resulting in residue and affecting the quality and transmission performance of the rectangular micro coaxial cable 1.

[0062] The characteristics of a quasi-planar bandstop filter based on a wide-narrow side hybrid coupling structure provided in this application embodiment are simulated, and the simulation results are as follows: Figure 9 As shown, S 11 S represents the return loss of the filter. 21 This represents the insertion loss of the filter. Simulation results show that the filter structure achieves a stopband rejection better than 30dB in the 26-33GHz range, a maximum insertion loss of 0.9dB in the passband, and a return loss of less than 15dB in the passband. This is something that microstrip bandstop filters cannot achieve in the millimeter-wave band, and it also features a narrow transition band between the passband and stopband, high roll-off, and high stopband rejection. Figure 9 Simulation results show that the filter provided in this application has advantages such as low insertion loss in the passband, high roll-off, high stopband suppression, and small size, providing a solution for high-performance millimeter-wave band-stop filters.

[0063] It is understood that this application has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this invention.

Claims

1. A quasi-planar band-rejection filter based on a wide-narrow edge hybrid coupling structure, characterized in that, The application relates to a rectangular micro coaxial line, including a conductor inner core and a shell, the conductor inner core is arranged in the shell and a gap exists between the conductor inner core and the shell, the gap is filled with medium, and the medium is air; a plurality of resonator structures are arranged between the conductor inner core and the shell and on the top and side of the conductor inner core, the rectangular micro coaxial line is loaded through electromagnetic coupling; an opening is arranged in the shell region opposite to the resonator structure arranged on the top of the conductor inner core; the conductor inner core and the shell of the rectangular micro coaxial line are made of copper; the material of the plurality of resonator structures is copper; a radio frequency signal is input into the quasi-planar band-stop filter based on the wide-narrow edge mixed coupling structure through the input end of the rectangular micro coaxial line, and the radio frequency signal is output from the output end of the rectangular micro coaxial line after being filtered by the quasi-planar band-stop filter based on the wide-narrow edge mixed coupling structure. Each resonator structure is a quarter wavelength resonator structure based on stepped impedance. The quarter wavelength resonator structure based on stepped impedance includes a first impedance line and a second impedance line, wherein: the impedance of the first impedance line is greater than the impedance of the second impedance line; the first end of the first impedance line is connected with the shell, the second end of the first impedance line is connected with the first end of the second impedance line, and the second end of the second impedance line is separated from the shell; the projection of the connection point of the first end of the first impedance line in each resonator structure in the plurality of resonator structures on the central axis of the length direction of the conductor inner core is sequentially arranged along the central axis. The second impedance line in the resonator structure arranged on the top of the conductor inner core is a right-angle bending structure; the bending direction of the second impedance line in part of the resonator structures arranged on the top of the conductor inner core is opposite to the bending direction of the second impedance line in another part of the resonator structures arranged on the top of the conductor inner core. The projection of the resonator structure arranged on the side of the conductor inner core on the top of the shell covers the total coverage range of the projection of the resonator structure arranged on the top of the conductor inner core on the top of the shell in the same direction. The plurality of resonator structures include a first resonator structure, a second resonator structure, a third resonator structure and a fourth resonator structure; the first resonator structure, the second resonator structure and the third resonator structure are arranged on the top of the conductor inner core and sequentially arranged on the top of the conductor inner core along the length direction of the conductor inner core; and the fourth resonator structure is arranged on the side of the conductor inner core.

2. The quasi-planar band-reject filter according to claim 1, characterized in that, The quasi-planar band-stop filter further includes a plurality of first medium support strips; the plurality of first medium support strips are periodically arranged at a preset interval, each first medium support strip penetrates the conductor inner core, and both ends of each first medium support strip are embedded in the inner wall of the shell.

3. The quasi-planar bandstop filter of claim 2, wherein, The quasi-planar band-stop filter further includes a plurality of second medium support strips and a plurality of abutments. ​ ​ ​ 4. The quasi-planar bandstop filter according to claim 3, characterized in that ​ ​ 5. The quasi-planar band reject filter according to any one of claims 1 to 4, characterized in that, ​ 6. The quasi-planar band-reject filter according to any one of claims 1 to 4, characterized in that, ​ ​ ​ 7. The quasi-planar band reject filter of claim 1, wherein, ​ ​ 8. The quasi-planar band reject filter of claim 4, wherein, ​ The plurality of pedestals correspond one-to-one to resonator structures disposed on a top of the conductor inner core; A first end of each pedestal is disposed on a lower side of a second end of a second impedance line in a corresponding resonator structure by way of integral molding; The plurality of second dielectric support strips correspond one-to-one to the plurality of pedestals; A second end of each pedestal is provided with a protruding positioning portion, and an upper side of each second dielectric support strip is provided with a positioning hole matching the positioning portion; A second end of a corresponding pedestal is connected to the upper side of the second dielectric support strip by embedding the positioning portion into the positioning hole; Left and right sides of each second dielectric support strip are respectively embedded into inner walls of the shell.

9. The quasi-planar band reject filter of claim 1, wherein, The shell is further provided with a plurality of release holes.

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