Three-dimensional micro-metal structure hybrid resonator filter

Abstract

The invention belongs to the technical field of filters, and particularly discloses a three-dimensional micro-metal structure hybrid resonator filter, which comprises a shell made of a metal material, a first cavity resonator, a second cavity resonator, a third cavity resonator and a fourth cavity resonator which are annularly arranged are arranged in the shell; the transmission line resonator is positioned between the second cavity resonator and the third cavity resonator; the output coupling structure and the input coupling structure are micro coaxial line-board level welding switching structures and are respectively arranged at two sides of the shell, the input coupling structure is connected with the first cavity resonator, and the output coupling structure is connected with the fourth cavity resonator; after the input coupling structure feeds a signal into the first cavity resonator of the filter, the signal is fed into the output coupling structure through the fourth cavity resonator. The filter is small in size, and has the advantages of low loss, high selectivity and wide application range.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and in particular relates to a three-dimensional micro-metal structure hybrid resonator filter. Background Art

[0002] Filters are an important component of communication systems. Their main function is to extract signals of interest and suppress other unwanted signals. The types of resonators commonly used to design filters are cavity resonators and transmission line resonators. In general, cavity filters have a high quality factor and large power capacity, which can significantly improve the frequency band selectivity of the filter and achieve lower losses. However, their disadvantage is that they are large in size, which is not conducive to the miniaturization and high integration of the filter. The quality factor of the transmission line resonator is lower than that of the cavity resonator, but it has the characteristics of miniaturization.

[0003] In specific designs, cavity resonators usually use complete substrate integrated waveguide resonators, half-mode or quarter-mode substrate integrated waveguide resonators, and transmission line resonators generally use open-loop resonators or microstrip resonators. However, since the cavity size of the complete substrate integrated waveguide resonator is very large, and the half-mode and quarter-mode substrate integrated waveguide resonators will produce large radiation losses due to the open structure, the insertion loss of the filter in the higher frequency band is further deteriorated. Although the microstrip resonator is easy to miniaturize, it still has the problem of large dielectric loss and radiation loss at higher frequencies.

[0004] In order to further tap the advantages of various resonator structures and avoid their disadvantages, hybrid resonator filters formed by composite design using multiple resonators have come into being. However, since the design of existing hybrid resonator filters is mostly based on dielectric substrates, this will make the hybrid resonator filters limited by problems such as dielectric loss and radiation loss, resulting in high losses when used at higher frequencies and a narrow range of applications. Summary of the invention

[0005] The purpose of the present invention is to provide a three-dimensional micro-metal structure hybrid resonator filter with the advantages of low loss and high selectivity, which significantly reduces the size of the filter and enables the filter to have board-level interconnection integration capabilities, thereby solving the technical problems of high loss and narrow application range of existing three-dimensional micro-metal structure hybrid resonator filters when used at higher frequencies.

[0006] To achieve the above purpose, the present invention provides a three-dimensional micro-metal structure hybrid resonator filter, and the specific technical solution is as follows:

[0007] A three-dimensional micro-metal structure hybrid resonator filter, comprising:

[0008] Metal housing;

[0009] The first cavity resonator, the second cavity resonator, the third cavity resonator and the fourth cavity resonator are located in the shell and arranged in a ring shape, the coupling between the first cavity resonator and the second cavity resonator, between the third cavity resonator and the fourth cavity resonator, between the second cavity resonator and the transmission line resonator, and between the transmission line resonator and the third cavity resonator is magnetic coupling, and the coupling between the second cavity resonator and the third cavity resonator is electrical coupling;

[0010] a transmission line resonator located between the second cavity resonator and the third cavity resonator;

[0011] The output coupling structure and the input coupling structure are both micro-coaxial line-board-level welding transition structures, which are respectively arranged on both sides of the shell, wherein the input coupling structure is connected to the first cavity resonator, and the output coupling structure is connected to the fourth cavity resonator; the input coupling structure feeds the signal into the first cavity resonator of the filter, and the signal is fed into the output coupling structure by the fourth cavity resonator.

[0012] Preferably, the first cavity resonator, the second cavity resonator, the third cavity resonator and the fourth cavity resonator have the same structure, the first cavity resonator includes a first cavity opened inside the shell, a first metal column is arranged at the center position of the first cavity, one end of the first metal column is connected to the bottom surface of the first cavity, and a first gap is formed between the other end and the top surface of the first cavity.

[0013] Preferably, the transmission line resonator includes a fifth cavity and a first metal core located inside the fifth cavity, the first metal core includes a first plate, a second plate, a third plate, a fourth plate and a fifth plate connected end to end in sequence, wherein the second plate, the third plate and the fourth plate are located on a first plane, the second plate and the fourth plate are parallel, the third plate and the fourth plate are perpendicular, the first plate and the fifth plate are located on a second plane, the second plane is perpendicular to the first plane, and the first plate and the fifth plate are both in contact with the top of the inner wall of the shell to form a short-circuit structure.

[0014] Preferably, the structure for realizing the magnetic coupling includes a coupling window structure on the side walls between the first cavity resonator and the second cavity resonator, between the third cavity resonator and the fourth cavity resonator, between the second cavity resonator and the transmission line resonator, and between the transmission line resonator and the third cavity resonator, and a release hole structure located on the shell.

[0015] Preferably, the structure for realizing the electrical coupling includes a third coupling window and an umbrella-shaped pin, wherein the third coupling window is opened on the side wall between the second cavity resonator and the third cavity resonator, and the umbrella-shaped pin is located in the middle of the third coupling window, and is used to generate a transmission zero point in the high-frequency stop band while providing electrical coupling.

[0016] Preferably, the umbrella-shaped pin comprises a metal plate and a metal column, one end of the metal column is fixed to the bottom of the cavity of the shell, and the other end of the metal column is fixed to the metal plate.

[0017] Preferably, the output coupling structure is the same as the input coupling structure, the input coupling structure includes a third release hole and a second metal core, one end of the second metal core is located in the first cavity resonator, a first opening is provided on the bottom surface of the shell, the other end of the second metal core is located in the first opening, an air gap structure is formed between the four sides of the second metal core and the inner wall of the first opening, the second metal core and the first opening constitute an interface interconnected with external components, which is used to realize signal transmission from the second metal core to the first cavity resonator, the third release hole is provided on the bottom surface of the shell, located on the lower side of the second metal core, which is used to complete the field conversion from the second metal core to the first cavity resonator, and excite the resonant mode of the first cavity resonator to realize the excitation of the filter.

[0018] Preferably, the second metal inner core comprises a sixth plate body, a seventh plate body and an eighth plate body connected in sequence, the sixth plate body and the eighth plate body are parallel, the sixth plate body and the seventh plate body are perpendicular, one end of the sixth plate body away from the seventh plate body is fixed to the top of the cavity of the shell, and one end of the eighth plate body away from the seventh plate body is arranged in the first through opening and the end face of the eighth plate body is flush with the surface of the shell.

[0019] Preferably, the seventh plate body is a stepped structure.

[0020] Compared with the prior art, the present invention provides a three-dimensional micro-metal structure hybrid resonator filter, which abandons the traditional dielectric substrate structure, avoids the influence of radiation loss and dielectric loss, reduces the insertion loss of the hybrid resonator filter, and has the working advantages of high frequency, low loss and high selectivity that the traditional dielectric plate circuit does not have. The entire filter structure adopts a first cavity resonator, a second cavity resonator, a third cavity resonator and a fourth cavity resonator arranged in a ring shape, and the transmission line resonator is arranged between the second cavity resonator and the third cavity resonator. The signal is fed into the first cavity resonator of the filter by using the input coupling structure, and fed into the output coupling structure from the fourth cavity resonator to form a signal path. Under this structure, the filter has the advantages of low loss and high selectivity when used at a higher frequency. Moreover, since the input coupling structure and the output coupling structure are micro-coaxial line-board-level welding transition structures, the filter can be well fed without occupying too much space, and the size of the filter can be significantly reduced, which is conducive to the board-level integration of the filter and other devices, broadens the application range of the filter, has strong practicality, and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view frame diagram of the present invention.

[0022] Figure 2 It is a side view frame diagram of the present invention.

[0023] Figure 3 It is a top perspective view of the present invention.

[0024] Figure 4 It is a bottom plan view of the present invention.

[0025] Figure 5 It is a top cross-sectional view of the present invention.

[0026] Figure 6 The side cross-section of the present invention Figure 1 .

[0027] Figure 7 The side cross-section of the present invention Figure 2 .

[0028] Figure 8 It is a bottom plan cross-sectional view of the present invention.

[0029] Fig. 9 It is a side view of the present invention.

[0030] Fig.10 It is a cross-sectional view of the present invention.

[0031] Fig.11 It is the coupling path diagram of the present invention.

[0032] Fig.12This is a diagram of the S parameter simulation results of the present invention. DETAILED DESCRIPTION

[0033] The current designs of hybrid resonator filters are mostly based on dielectric substrates, which will limit the hybrid resonator filters to the problems of dielectric loss and radiation loss, resulting in high losses when the hybrid resonator filters are used at higher frequencies and a narrow application range.

[0034] In response to the technical problems that the current hybrid resonator filters have high losses and a narrow application range when used at higher frequencies, the present invention provides a new three-dimensional micro-metal structure hybrid resonator filter, which abandons the traditional dielectric substrate structure, avoids the influence of radiation loss and dielectric loss, reduces the insertion loss of the hybrid resonator filter, and has the working advantages of high frequency, low loss and high selectivity that traditional dielectric plate circuits do not have.

[0035] The following will be combined with the attached Figure 1 To the attached Fig.12 , the technical solution in the present invention is described clearly and in detail.

[0036] It should be further explained that, in the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, “multiple” refers to two or more than two.

[0037] In addition, it should be understood that the orientations or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] The following terms "first", "second", "third" and "fourth" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] Example 1

[0040] like Figures 1 to 6As shown, the present invention provides a three-dimensional micro-metal structure hybrid resonator filter, which includes a housing 101, the housing 101 is made of metal, and 5 resonators are arranged inside the housing 101, including 4 cavity resonators and a half-wavelength transmission line resonator. Specifically, the 4 cavity resonators are a first cavity resonator 102, a second cavity resonator 103, a third cavity resonator 104 and a fourth cavity resonator 105, and the first cavity resonator 102, the second cavity resonator 103, the third cavity resonator 104 and the fourth cavity resonator 105 are arranged in a ring. The half-wavelength transmission line resonator is realized by a transmission line resonator 203, which is located between the second cavity resonator 103 and the third cavity resonator 104. An output coupling structure and an input coupling structure are respectively arranged on both sides of the shell 101, wherein the input coupling structure is connected to the first cavity resonator 102 signal, and the output coupling structure is connected to the fourth cavity resonator 105 signal. The output coupling structure and the input coupling structure are respectively used to connect to external components, and the external signal is fed into the first cavity resonator 102 of the filter through the input coupling structure, and finally fed into the output coupling structure from the fourth cavity resonator 105 to form a signal path.

[0041] In the present invention, the output coupling structure and the input coupling structure are micro-coaxial line-board-level welding transition structures, which can better feed the filter without taking up too much space, can significantly reduce the size of the filter, are conducive to board-level integration of the filter and other devices, and broaden the application range of the filter.

[0042] Specifically, Figure 3 and Figure 5 As shown, the first cavity resonator 102 includes a first cavity opened inside the shell 101, and a first metal column 106 is arranged at the center of the first cavity. One end of the first metal column 106 is connected to the bottom surface of the first cavity, and a first gap is formed between the other end and the top surface of the first cavity.

[0043] Specifically, Figure 3 and Figure 5 As shown, the second cavity resonator 103 includes a second cavity opened inside the shell 101, and a second metal column 107 is arranged at the center of the second cavity. One end of the second metal column 107 is connected to the bottom surface of the second cavity, and a second gap is formed between the other end and the top surface of the second cavity.

[0044] Specifically, Figure 7 As shown, the third cavity resonator 104 includes a third cavity opened inside the shell 101, and a third metal column 108 is arranged at the center of the third cavity. One end of the third metal column 108 is connected to the bottom surface of the third cavity, and a third gap is formed between the other end and the top surface of the third cavity.

[0045] Specifically, the fourth cavity resonator 105 includes a fourth cavity opened inside the shell 101, and a fourth metal column 109 is arranged at the center of the fourth cavity. One end of the fourth metal column 109 is connected to the bottom surface of the fourth cavity, and a fourth gap is formed between the other end and the top surface of the fourth cavity.

[0046] Specifically, the first gap, the second gap, the third gap and the fourth gap can be equivalent to capacitors, which can reduce the resonant frequency of the resonator, thereby facilitating the miniaturization of the filter. In the design, the equivalent capacitance can be adjusted by adjusting the first gap, the second gap, the third gap and the fourth gap respectively.

[0047] In addition, in the design, the resonant frequency of the resonator can be adjusted by adjusting the diameters of the first metal column 106 , the second metal column 107 , the third metal column 108 , and the fourth metal column 109 , respectively.

[0048] In addition, the transmission line resonator 203 is located inside the housing 101 , between the second cavity resonator 103 and the third cavity resonator 104 , and the transmission line resonator 203 exists as a half-wavelength micro-coaxial transmission line resonator.

[0049] Specifically, as a further refinement of this embodiment, the transmission line resonator 203 includes a fifth cavity and a first metal inner core located inside the fifth cavity, and adjusting the length of the first metal inner core can adjust the resonant frequency of the micro coaxial transmission line resonator.

[0050] Specifically, the first metal inner core includes a first plate body, a second plate body, a third plate body, a fourth plate body and a fifth plate body which are connected end to end in sequence, wherein the second plate body, the third plate body and the fourth plate body are located on a first plane, the second plate body and the fourth plate body are parallel, the third plate body and the fourth plate body are perpendicular, the first plate body and the fifth plate body are located on a second plane, wherein the second plane is perpendicular to the first plane, and the first plate body and the fifth plate body are in contact with the top of the inner wall of the shell 101 to form a short-circuit structure.

[0051] The coupling path formed by the first cavity resonator 102, the second cavity resonator 103, the transmission line resonator 203, the third cavity resonator 104 and the fourth cavity resonator 105 is as follows: the second cavity resonator 103, the transmission line resonator 203 and the third cavity resonator 104 form a ring-shaped coupling path, and the coupling mode of the three resonators is as follows: the coupling mode between the second cavity resonator 103 and the third cavity resonator 104 is cross coupling, and the coupling mode between the second cavity resonator 103 and the transmission line resonator 203, and the transmission line resonator 203 and the third cavity resonator 104 is main coupling. The coupling between the first cavity resonator 102 and the second cavity resonator 103, and the coupling between the third cavity resonator 104 and the fourth cavity resonator 105 are both main coupling, the polarity of the main coupling is magnetic coupling, and the polarity of the cross coupling is electrical coupling.

[0052] Specifically, the coupling path composed of the first cavity resonator 102, the second cavity resonator 103, the transmission line resonator 203, the third cavity resonator 104 and the fourth cavity resonator 105 can be composed of Fig.11 The first cavity resonator 102 is represented by number 1, the second cavity resonator 103 is represented by number 2, the transmission line resonator 203 is represented by number 3, the third cavity resonator 104 is represented by number 4, the fourth cavity resonator 105 is represented by number 5, the input coupling structure is represented by S, and the output coupling structure is represented by L.

[0053] Specifically, the structure for realizing magnetic coupling includes a coupling window structure on the side wall between the first cavity resonator 102 and the second cavity resonator 103, between the third cavity resonator 104 and the fourth cavity resonator 105, between the second cavity resonator 103 and the transmission line resonator 203, and between the transmission line resonator 203 and the third cavity resonator 104, and a release hole structure located on the housing 101. The specific structure is described as follows:

[0054] The coupling between the first cavity resonator 102 and the second cavity resonator 103 is magnetic coupling. In a specific design, a first coupling window 501 is opened between the first cavity resonator 102 and the second cavity resonator 103. The first coupling window 501 is formed by digging out part of the side wall between the first cavity resonator 102 and the second cavity resonator 103. The first coupling window 501 is used to realize the magnetic coupling between the first cavity resonator 102 and the second cavity resonator 103. The size of the magnetic coupling between the first cavity resonator 102 and the second cavity resonator 103 can be adjusted by adjusting the width of the first coupling window 501.

[0055] The coupling between the third cavity resonator 104 and the fourth cavity resonator 105 is magnetic coupling. In a specific design, a second coupling window 502 is opened between the third cavity resonator 104 and the fourth cavity resonator 105. The second coupling window 502 is formed by digging out a portion of the side wall between the third cavity resonator 104 and the fourth cavity resonator 105. The second coupling window 502 is used to realize the magnetic coupling between the third cavity resonator 104 and the fourth cavity resonator 105. The size of the magnetic coupling between the third cavity resonator 104 and the fourth cavity resonator 105 can be adjusted by adjusting the width of the second coupling window 502.

[0056] The coupling between the second cavity resonator 103 and the transmission line resonator 203 is magnetic coupling. In a specific design, a fourth coupling window 504 is provided on the side wall of the second cavity resonator 103. The fourth coupling window 504 is formed by digging out part of the side wall of the second cavity resonator 103. The first plate on the first metal inner core is located in the fourth coupling window 504. At the same time, a first release hole 305 penetrating the bottom surface of the shell 101 is provided on the shell 101. The function of the first release hole 305 is to complete the field conversion between the second cavity resonator 103 and the transmission line resonator 203. The strength of the magnetic coupling between the second cavity resonator 103 and the transmission line resonator 203 can be adjusted by adjusting the position of the first release hole 305.

[0057] The coupling between the transmission line resonator 203 and the third cavity resonator 104 is magnetic coupling. In a specific design, a fifth coupling window 505 is provided on the side wall of the third cavity resonator 104. The fifth coupling window 505 is formed by digging out part of the side wall of the third cavity resonator 104. The fifth plate on the first metal inner core is located in the fifth coupling window 505. At the same time, a second release hole 306 penetrating the bottom surface of the shell 101 is provided on the shell 101. The function of the second release hole 306 is to complete the field conversion between the transmission line resonator 203 and the third cavity resonator 104. The strength of the magnetic coupling between the transmission line resonator 203 and the third cavity resonator 104 can be adjusted by adjusting the position of the second release hole 306.

[0058] The second cavity resonator 103 and the third cavity resonator 104 are cross-coupled, and the specific coupling mode is electrical coupling. In the specific design, a third coupling window 503 is opened between the second cavity resonator 103 and the third cavity resonator 104. The third coupling window 503 is formed by digging out part of the side wall between the second cavity resonator 103 and the third cavity resonator 104. An umbrella-shaped pin 110 is arranged in the middle of the third coupling window 503. The electrical coupling is realized with the help of the third coupling window 503 and the umbrella-shaped pin 110.

[0059] like Figure 6As shown, the structure of the umbrella-shaped pin 110 consists of a metal plate 111 and a metal column 112, one end of the metal column 112 is fixed to the bottom of the cavity of the shell 101, and the other end of the metal column 112 is fixed to the metal plate 111. The strength of the electric coupling can be controlled by adjusting the sizes of the metal column 112 and the metal plate 111 and the width of the third coupling window 503. The umbrella-shaped pin 110 can generate a transmission zero in the high-frequency stop band while providing electrical coupling.

[0060] like Figures 3 to 5 As shown, the input coupling structure includes a third release hole 303 and a second metal inner core 201. Specifically, the second metal inner core 201 exists in the form of a transmission line. One end of the second metal inner core 201 is located in the first cavity resonator 102. A first through-hole 506 is opened on the bottom surface of the shell 101. The other end of the second metal inner core 201 is located in the first through-hole 506. An air gap structure is formed between the periphery of the second metal inner core 201 and the inner wall of the first through-hole 506. The second metal inner core 201 and the first through-hole 506 form an air gap structure. The interface interconnected with the external components, the first through hole 506 exposes the end of the second metal core 201, which is convenient for connection with a test probe or a dielectric substrate, and is used to realize the transmission of the signal from the second metal core 201 to the first cavity resonator 102. The third release hole 303 is opened on the bottom surface of the shell 101, located on the lower side of the second metal core 201, and is used to complete the field conversion from the second metal core 201 to the first cavity resonator 102, and to excite the resonant mode of the first cavity resonator 102 to realize the excitation of the filter.

[0061] Specifically, Fig.10 As shown, the second metal inner core 201 includes a sixth plate 204, a seventh plate 205 and an eighth plate 206 connected in sequence, wherein the sixth plate 204 and the eighth plate 206 are parallel, the sixth plate 204 and the seventh plate 205 are perpendicular, the end of the sixth plate 204 away from the seventh plate 205 is fixed to the top of the cavity of the shell 101, and the end of the eighth plate 206 away from the seventh plate 205 is arranged in the first through opening 506 and the end face of the eighth plate 206 is flush with the surface of the shell 101.

[0062] Specifically, Figure 3 As shown, the third release hole 303 is in a clamp shape.

[0063] like Figures 3 to 5 As shown, the output coupling structure has the same structure as the input coupling structure, specifically, it includes a fourth release hole 304 and a third metal inner core 202, the third metal inner core 202 exists in the form of a transmission line, and one end of the third metal inner core 202 is located in the fourth cavity resonator 105, as shown in FIG. Figure 8As shown, a second opening 507 is provided on the bottom surface of the shell 101, and the other end of the third metal core 202 is located in the second opening 507. An air gap structure is formed between the periphery of the third metal core 202 and the inner wall of the second opening 507. The third metal core 202 and the second opening 507 constitute an interface interconnected with external components. The second opening 507 exposes the end of the third metal core 202 to facilitate connection with a test probe or a dielectric substrate, so as to realize signal transmission from the fourth cavity resonator 105 to the third metal core 202. The fourth release hole 304 is provided on the bottom surface of the shell 101, and is located on the lower side of the third metal core 202, so as to complete the field conversion from the fourth cavity resonator 105 to the third metal core 202.

[0064] Specifically, Figures 8 to 10 As shown, the structure of the third metal inner core 202 is the same as that of the second metal inner core 201, and the third metal inner core 202 includes a ninth plate body, a tenth plate body and an eleventh plate body 207 connected in sequence, wherein the ninth plate body and the eleventh plate body 207 are parallel, the ninth plate body and the tenth plate body are perpendicular, one end of the ninth plate body away from the tenth plate body is fixed to the top of the cavity of the shell 101, and one end of the eleventh plate body 207 away from the tenth plate body is arranged in the second through opening 507 and the end face of the eleventh plate body 207 is flush with the surface of the shell 101.

[0065] Specifically, Figure 3 As shown, the fourth release hole 304 and the third release hole 303 have the same structure and are both in a clamp shape.

[0066] Furthermore, in order to improve the performance of the transmission line, a portion of the seventh plate 205 is cut off at the downward bending position to form a step structure.

[0067] In addition, the cross-sectional dimension of a section of the eighth board body 206 disposed in the first through opening 506 is slightly smaller than the dimensions of other cross-sections, and this end is used as a test contact for transfer connection, which enables the filter to have board-level integration capability.

[0068] Considering the performance and processing convenience, the filter provided by the present invention is processed by electrochemical additive process. In order to release the photoresist used in the manufacturing process, a number of fifth release holes 301 and sixth release holes 302 are opened on the housing 101. The sizes of all fifth release holes 301 are the same, and the sizes of all sixth release holes 302 are the same. It should be noted that the number of the fifth release holes 301 and the sixth release holes 302 should not be too many or too few. Too many will cause electromagnetic leakage, and too few will cause incomplete removal of photoresist, resulting in residue. The number should be determined after comprehensive consideration in the design.

[0069] In addition, in order to realize the positioning function of the first metal core 201, the second metal core 201 and the third metal core 202, a first dielectric support bar 401 is passed through the second metal core 201, a second dielectric support bar 402 is passed through the third metal core 202, a third dielectric support bar 405 is passed through the third plate body of the first metal core, a fourth dielectric support bar 403 is passed through the first plate body of the first metal core, and a fifth dielectric support bar 404 is passed through the fifth plate body of the first metal core. One pair of side surfaces of the first dielectric support bar 401, the second dielectric support bar 402, the third dielectric support bar 405, the fourth dielectric support bar 403 and the fifth dielectric support bar 404 are respectively fixed to a pair of inner walls of the shell 101 to improve the stability of supporting the first metal core, the second metal core 201 and the third metal core 202.

[0070] like Fig.12 As shown, after simulation design experiments, the 1dB passband range of the filter in this specific implementation is 92GHz-96GHz, the minimum insertion loss in the band is 1.24dB, the return loss is better than 18dB, and there is a zero point at 90.26GHz and 102.18GHz respectively, and the out-of-band suppression at 90.2GHz is better than 45dB, with high frequency band selectivity.

[0071] Compared with the existing similar technologies, the three-dimensional micro-metal structure hybrid resonator filter provided by the present invention uses the basic design method of the cross-coupling filter, so that the coupling structure between the designed cavity resonator and the transmission line resonator is relatively simple and easy to implement, and has the advantages of high quality factor of the cavity resonator and miniaturization of the transmission line resonator, further improving the integration and design flexibility of the filter, facilitating the realization of micro-nano processing by the process of electrochemical additive manufacturing, and conveniently realizing mass production under the premise of ensuring the excellent performance of the filter. At the same time, the hybrid resonator filter provided by the present invention has a micro-coaxial line-board-level welding transition structure, which can better feed the filter without taking up too much space, significantly reducing the size of the filter, facilitating the board-level integration of the filter and other devices, and broadening the application range of the filter. In addition, since the hybrid resonator filter abandons the traditional dielectric substrate, it avoids the influence of radiation loss and dielectric loss, reduces the insertion loss of the hybrid resonator filter, and has the working advantages of high frequency, low loss and high selectivity that the traditional dielectric board circuit does not have, and can be applied in higher frequency bands such as W band.

[0072] It will be understood that the present invention is described through some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention.

[0073] In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present invention are within the scope of protection of the present invention.

Claims

1. A three-dimensional micro-metal structure hybrid resonator filter, characterized in that: include: A housing (101) made of metal; The first cavity resonator (102), the second cavity resonator (103), the third cavity resonator (104) and the fourth cavity resonator (105) are located in the housing (101) and arranged in a ring shape; the first cavity resonator (102) and the second cavity resonator (103), the third cavity resonator (104) and the fourth cavity resonator (105), the second cavity resonator (103) and the transmission line resonator (203), and the transmission line resonator (203) and the third cavity resonator (104) are all magnetically coupled; and the second cavity resonator (103) and the third cavity resonator (104) are electrically coupled; A transmission line resonator (203) located between the second cavity resonator (103) and the third cavity resonator (104); The output coupling structure and the input coupling structure are both micro-coaxial line-board-level welding transition structures, which are respectively arranged on both sides of the housing (101), wherein the input coupling structure is connected to the first cavity resonator (102) for signal connection, and the output coupling structure is connected to the fourth cavity resonator (105) for signal connection; after the input coupling structure feeds the signal into the first cavity resonator (102) of the filter, the signal is fed into the output coupling structure by the fourth cavity resonator (105).

2. The three-dimensional micro-metal structure hybrid resonator filter according to claim 1, characterized in that: The first cavity resonator (102), the second cavity resonator (103), the third cavity resonator (104) and the fourth cavity resonator (105) have the same structure. The first cavity resonator (102) comprises a first cavity opened inside the shell (101). A first metal column (106) is arranged at the center of the first cavity. One end of the first metal column (106) is connected to the bottom surface of the first cavity, and a first gap is formed between the other end and the top surface of the first cavity.

3. The three-dimensional micrometal structure hybrid resonator filter according to claim 2, characterized in that: The transmission line resonator (203) comprises a fifth cavity and a first metal inner core located inside the fifth cavity, wherein the first metal inner core comprises a first plate, a second plate, a third plate, a fourth plate and a fifth plate connected end to end in sequence, wherein the second plate, the third plate and the fourth plate are located on a first plane, the second plate and the fourth plate are parallel, the third plate and the fourth plate are perpendicular, the first plate and the fifth plate are located on a second plane, the second plane is perpendicular to the first plane, and the first plate and the fifth plate are both in contact with the top of the inner wall of the shell (101) to form a short-circuit structure.

4. The three-dimensional micro-metal structure hybrid resonator filter according to claim 3, characterized in that: The structure for realizing the magnetic coupling comprises a coupling window structure on the side wall between the first cavity resonator (102) and the second cavity resonator (103), between the third cavity resonator (104) and the fourth cavity resonator (105), between the second cavity resonator (103) and the transmission line resonator (203), and between the transmission line resonator (203) and the third cavity resonator (104), and a release hole structure located on the shell (101).

5. The three-dimensional micro-metal structure hybrid resonator filter according to claim 4, characterized in that: The structure for realizing the electrical coupling comprises a third coupling window (503) and an umbrella-shaped pin (110), wherein the third coupling window (503) is opened on the side wall between the second cavity resonator (103) and the third cavity resonator (104), and the umbrella-shaped pin (110) is located in the middle of the third coupling window (503) and is used to generate a transmission zero point in the high-frequency stop band while providing electrical coupling.

6. The three-dimensional micro-metal structure hybrid resonator filter according to claim 5, characterized in that: The umbrella-shaped pin (110) comprises a metal plate (111) and a metal column (112), one end of the metal column (112) is fixed to the bottom of the cavity of the housing (101), and the other end of the metal column (112) is fixed to the metal plate (111).

7. The three-dimensional micrometal structure hybrid resonator filter according to claim 1, characterized in that: The output coupling structure has the same structure as the input coupling structure, and the input coupling structure comprises a third release hole (303) and a second metal inner core (201), one end of the second metal inner core (201) is located in the first cavity resonator (102), a first through opening (506) is provided on the bottom surface of the shell (101), the other end of the second metal inner core (201) is located in the first through opening (506), and an air gap structure is formed between the periphery of the second metal inner core (201) and the inner wall of the first through opening (506). The second metal inner core (201) and the first opening (506) form an interface interconnected with an external element, and are used to transmit a signal from the second metal inner core (201) to the first cavity resonator (102). The third release hole (303) is provided on the bottom surface of the shell (101), and is located on the lower side of the second metal inner core (201), and is used to complete the field conversion from the second metal inner core (201) to the first cavity resonator (102), and to excite the resonance mode of the first cavity resonator (102), thereby realizing the excitation of the filter.

8. The three-dimensional micrometal structure hybrid resonator filter according to claim 7, characterized in that: The second metal inner core (201) comprises a sixth plate body (204), a seventh plate body (205) and an eighth plate body (206) which are connected in sequence, the sixth plate body (204) and the eighth plate body (206) are parallel, the sixth plate body (204) and the seventh plate body (205) are perpendicular, one end of the sixth plate body (204) away from the seventh plate body (205) is fixed to the top of the cavity of the shell (101), and one end of the eighth plate body (206) away from the seventh plate body (205) is arranged in the first through opening (506) and the end face of the eighth plate body (206) is flush with the surface of the shell (101).

9. The three-dimensional micrometal structure hybrid resonator filter according to claim 8, characterized in that: The seventh plate (205) is a step structure.

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