Ten-order six-transmission zero dielectric waveguide filter

Abstract

The ten-order six-transmission-zero-point dielectric waveguide filter comprises a dielectric waveguide resonator and a coupling structure, the dielectric waveguide resonator comprises a resonator body, a resonant blind hole and a conductive layer, and the coupling structure comprises a coupling through groove and a coupling blind hole. The surfaces of the resonator bodies and the inner wall faces of the resonance blind holes, the coupling through grooves and the coupling blind holes are coated with the conductive layers, the ten dielectric waveguide resonators are arranged in a five-transverse two-longitudinal mode, the adjacent resonator bodies are connected into a whole, and the dielectric waveguide resonators are arranged in a five-transverse two-longitudinal mode. According to the ten-order six-transmission-zero-point filter, a coupling through groove is formed in a cross-shaped connecting part formed by any four adjacent resonator bodies, and only one coupling blind hole is formed in any four adjacent resonator bodies, so that the ten-order six-transmission-zero-point filter with three topological structures can be formed; therefore, the positions of the transmission zeros in the topological structure corresponding to the resonant blind holes can be adjusted, so that the positions of the six transmission zeros can be independently adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and in particular relates to a tenth-order six-transmission zero-point dielectric waveguide filter. Background Art

[0002] A filter is a frequency-selective device that allows specific frequency components in a signal to pass through while greatly attenuating other frequency components. The frequency-selective function of the filter can be used to filter out interference noise or perform spectrum analysis. The transmission zero point refers to the frequency point on the filter transmission function that is equal to zero. At this frequency point, energy cannot pass through the network, thus achieving complete isolation. It is an important indicator for measuring filter performance.

[0003] Due to the limitation of spectrum resources, filters in modern communication systems need to form strong suppression near the passband edge. The usual practice is to design transmission zeros at the edge of the filter passband to increase the rectangular coefficient of the filter.

[0004] The tenth-order waveguide dielectric filter is a common filter used in communication systems. The structures of existing tenth-order waveguide filters are roughly divided into two categories: CQ structure and CT or BOX structure. The former can achieve six transmission zeros, three of which are at the low-frequency end of the passband and the other three at the high-frequency end of the passband, but the structure cannot adjust the position of a single transmission zero individually. Although the latter can adjust the position of the transmission zero individually, it can only achieve four transmission zeros at most, which is difficult to meet higher performance indicators. Increasing the number of transmission zeros by increasing the order will lead to an increase in the weight and volume of the filter, and the insertion loss will also increase accordingly. The difficulty of design and processing will also increase, which is difficult to take into account. Summary of the invention

[0005] The object of the present invention is to overcome one or more disadvantages in the prior art and to provide a tenth-order six-transmission zero dielectric waveguide filter.

[0006] To achieve the above object, the technical solution adopted by the present invention is a tenth-order six-transmission zero dielectric waveguide filter, comprising: A dielectric waveguide resonator, the dielectric waveguide resonator comprising a resonator body made of a solid dielectric material, a resonant blind hole opened on the upper surface of the resonator body and extending downward, and a conductive layer covering the surface of the resonator body and the inner wall of the resonant blind hole, and there are ten dielectric waveguide resonators in total; A coupling structure, wherein the coupling structure comprises a coupling through slot and a coupling blind hole which are opened on the upper surface of the resonator body and extend downward, and the inner wall of the coupling through slot and the coupling blind hole is covered with the conductive layer; The ten dielectric waveguide resonators are arranged in a five-horizontal and two-vertical manner, the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are not covered with the conductive layer, and the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are connected to each other and form a whole; A coupling through slot is provided at the cross connection formed by any four adjacent resonator bodies, and there is only one coupling blind hole on any four adjacent resonator bodies; The tenth-order six-transmission zero dielectric waveguide filter has three topological structures, each of which is composed of six dielectric waveguide resonators located in three adjacent horizontal rows. Each topological structure has two transmission zeros. The two topological structures located at both ends adjust the positions of the transmission zeros through two or three resonant blind holes located in the same vertical direction of the topological structure, and the topological structure located in the middle adjusts the position of the transmission zeros through the resonant blind holes located in another vertical direction of the topological structure.

[0007] Preferably, the coupling through groove comprises a transverse groove extending to adjacent surfaces of two adjacent resonator bodies in the same longitudinal direction.

[0008] Further preferably, the adjacent surfaces of any two adjacent resonator bodies in the same longitudinal direction are provided with the transverse groove.

[0009] Further preferably, the coupling through groove further includes a longitudinal groove extending to adjacent surfaces of two adjacent resonator bodies in the same horizontal row.

[0010] Further preferably, in two adjacent horizontal rows, only adjacent surfaces of two adjacent resonator bodies in one horizontal row are provided with the longitudinal grooves.

[0011] Preferably, the projection of the coupling slot in the up and down directions is in any one of a straight line shape, an L shape, a T shape or a cross shape.

[0012] Preferably, the coupling blind hole is arranged at the connecting portion of two adjacent resonator bodies in the same horizontal row.

[0013] Further preferably, the connecting portion of two adjacent resonator bodies provided with the coupling blind hole is not provided with the longitudinal groove.

[0014] Preferably, the resonant blind hole is arranged close to the center of the upper surface of the resonator body where the resonant blind hole is located.

[0015] Preferably, the tenth-order six-transmission zero-point dielectric waveguide filter further includes an input blind hole and an output blind hole, the input blind hole and the output blind hole are opened on the back side of the two resonator bodies located at both ends in the same longitudinal direction, and the input blind hole and the output blind hole are coaxially arranged with the resonance blind hole.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: By arranging ten dielectric waveguide resonators in a five-horizontal and two-vertical manner, adjacent surfaces of resonator bodies on adjacent dielectric waveguide resonators are not covered with a conductive layer, and adjacent surfaces of resonator bodies on adjacent dielectric waveguide resonators are connected to each other and form an integral body; a coupling through slot is provided at a cross connection formed by any four adjacent resonator bodies, and only one coupling blind hole is provided on any four adjacent resonator bodies; a tenth-order six-transmission zero-point dielectric waveguide filter with three topological structures can be formed, wherein the topological structure is composed of six dielectric waveguide resonators located in three adjacent horizontal rows, each topological structure has two transmission zero points, and the two topological structures located at both ends can adjust the position of the transmission zero point through two or three resonant blind holes located in the same vertical direction of the topological structure, and the topological structure located in the middle can adjust the position of the transmission zero point through the resonant blind hole located in another vertical direction of the topological structure, thereby achieving a technical effect that the positions of the six transmission zero points can be independently adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic top view of a preferred embodiment of the present invention, wherein the dotted line represents the boundary of a single dielectric waveguide resonator.

[0018] Figure 2 yes Figure 1 Schematic diagram of the top view.

[0019] Figure 3 yes Figure 1 A three-dimensional schematic diagram of .

[0020] Figure 4 yes Figure 1 Schematic diagram of the positional relationship between a single dielectric waveguide resonator and a single topological structure.

[0021] Figure 5 yes Figure 1 S-parameter curve.

[0022] Wherein: 1. the first dielectric waveguide resonator; 2. the second dielectric waveguide resonator; 3. the third dielectric waveguide resonator; 4. the fourth dielectric waveguide resonator; 5. the fifth dielectric waveguide resonator; 6. the sixth dielectric waveguide resonator; 7. the seventh dielectric waveguide resonator; 8. the eighth dielectric waveguide resonator; 9. the ninth dielectric waveguide resonator; 10. the tenth dielectric waveguide resonator; 11. the first resonant blind hole; 12. the second resonant blind hole; 13. the third resonant blind hole; 14. the fourth resonant blind hole; 15. the fifth resonant blind hole; 16. the sixth resonant blind hole Resonance blind hole; 17. Seventh resonant blind hole; 18. Eighth resonant blind hole; 19. Ninth resonant blind hole; 20. Tenth resonant blind hole; 31. Coupling through slot; 311. Horizontal slot; 312. Vertical slot; 32. Coupling blind hole; 41. First topological structure; 42. Second topological structure; 43. Third topological structure; 51. First transmission zero point; 52. Second transmission zero point; 53. Third transmission zero point; 54. Fourth transmission zero point; 55. Fifth transmission zero point; 56. Sixth transmission zero point; 61. Input blind hole; 62. Output blind hole. DETAILED DESCRIPTION

[0023] like Figures 1 to 5As shown, the tenth-order six-transmission zero dielectric waveguide filter provided by the present invention comprises: a dielectric waveguide resonator and a coupling structure. There are ten dielectric waveguide resonators, namely a first dielectric waveguide resonator 1, a second dielectric waveguide resonator 2, a third dielectric waveguide resonator 3, a fourth dielectric waveguide resonator 4, a fifth dielectric waveguide resonator 5, a sixth dielectric waveguide resonator 6, a seventh dielectric waveguide resonator 7, an eighth dielectric waveguide resonator 8, a ninth dielectric waveguide resonator 9, and a tenth dielectric waveguide resonator 10. Each dielectric waveguide resonator comprises a resonator body, a resonant blind hole, and a conductive layer. Specifically, the resonator body is made of a solid dielectric material. In this embodiment, the solid dielectric material is ceramic, which has a high dielectric constant, hardness and good high temperature resistance. In other embodiments, the solid dielectric material may also be glass, an electrically insulating high molecular polymer, etc. The resonant blind hole is opened on the upper surface of the resonator body and extends downward. The resonant blind hole is arranged near the center of the upper surface of the resonator body where it is located. The resonant blind hole comprises a resonator body, a resonant blind hole, and a conductive layer. The first resonant blind hole 11, the second resonant blind hole 12, the third resonant blind hole 13, the fourth resonant blind hole 14, the fifth resonant blind hole 15, the sixth resonant blind hole 16, the seventh resonant blind hole 17, the eighth resonant blind hole 18, the ninth resonant blind hole 19, the tenth resonant blind hole 20, the second resonant blind hole 21, the third resonant blind hole 22, the fourth resonant blind hole 23, the fifth resonant blind hole 24, the sixth resonant blind hole 25, the seventh resonant blind hole 26, the seventh resonant blind hole 27, the eighth resonant blind hole 28, the ninth resonant blind hole 29, the tenth resonant blind hole 20 The eighth resonant blind hole 18, the ninth resonant blind hole 19, and the tenth resonant blind hole 20, the conductive layer is coated on the surface of the resonator body and the inner wall of the resonant blind hole. In the present embodiment, the conductive layer is a silver layer, which has high conductivity, low loss, and good solderability. In other embodiments, the conductive layer can also be other conductive metal materials such as copper and nickel that can meet the index requirements; the coupling structure includes a coupling through groove 31 and a coupling blind hole 32 which are opened on the upper surface of the resonator body and extend downward, and the inner wall of the coupling through groove 31 and the coupling blind hole 32 is coated with a conductive layer.

[0024] In this embodiment, the first dielectric waveguide resonator 1, the second dielectric waveguide resonator 2, the third dielectric waveguide resonator 3, the fourth dielectric waveguide resonator 4, the fifth dielectric waveguide resonator 5, the sixth dielectric waveguide resonator 6, the seventh dielectric waveguide resonator 7, the eighth dielectric waveguide resonator 8, the ninth dielectric waveguide resonator 9, and the tenth dielectric waveguide resonator 10 are arranged in five horizontal rows and two vertical columns, and the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are not covered with a conductive layer, and the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are connected to each other and form a whole; a coupling through groove 31 is provided at the cross connection portion formed by any four adjacent resonator bodies, and there is only one coupling blind hole 32 on any four adjacent resonator bodies.

[0025] The advantage of such an arrangement is that the tenth-order six-transmission zero dielectric waveguide filter can have three topological structures, namely, a first topological structure 41, a second topological structure 42, and a third topological structure 43. Each topological structure is composed of six dielectric waveguide resonators located in three adjacent horizontal rows. Specifically, the first topological structure 41 is composed of a first dielectric waveguide resonator 1, a second dielectric waveguide resonator 2, a third dielectric waveguide resonator 3, a fourth dielectric waveguide resonator 4, a fifth dielectric waveguide resonator 5, and a sixth dielectric waveguide resonator 6. The second topological structure 42 is composed of The third dielectric waveguide resonator 3, the fourth dielectric waveguide resonator 4, the fifth dielectric waveguide resonator 5, the sixth dielectric waveguide resonator 6, the seventh dielectric waveguide resonator 7, and the eighth dielectric waveguide resonator 8 are formed, and the third topological structure 43 is composed of the fifth dielectric waveguide resonator 5, the sixth dielectric waveguide resonator 6, the seventh dielectric waveguide resonator 7, the eighth dielectric waveguide resonator 8, the ninth dielectric waveguide resonator 9, and the tenth dielectric waveguide resonator 10; the first topological structure 41, the second topological structure 42, and the third topological structure 43 all have two transmission zero points, specifically, as Figure 5 As shown, the first topological structure 41 has a first transmission zero point 51 and a second transmission zero point 52, the second topological structure 42 has a third transmission zero point 53 and a fourth transmission zero point 54, and the third topological structure 43 has a fifth transmission zero point 55 and a sixth transmission zero point 56; the first topological structure 41 and the third topological structure 43 are located at two ends, and the second topological structure 42 is located in the middle. The first topological structure 41 adjusts the positions of the first transmission zero point 51 and the second transmission zero point 52 on the horizontal axis (frequency (GHz)) through the first resonant blind hole 11 and the third resonant blind hole 13 located in the same vertical axis of the first topological structure 41, and the third topological structure 43 adjusts the positions of the first transmission zero point 51 and the second transmission zero point 52 on the horizontal axis (frequency (GHz)) through the first resonant blind hole 11 and the third resonant blind hole 13 located in the same vertical axis of the third topological structure 43. The resonant blind hole 17 and the ninth resonant blind hole 19 adjust the positions of the fifth transmission zero point 55 and the sixth transmission zero point 56 on the horizontal axis (frequency (GHz)). The fifth resonant blind hole 15 can adjust the positions of the first transmission zero point 51 and the second transmission zero point 52, as well as the fifth transmission zero point 55 and the sixth transmission zero point 56. In actual use, the fifth resonant blind hole 15 is used to adjust the positions of the transmission zero points in the first topological structure 41 or the third topological structure 43; the second topological structure 42 adjusts the positions of the third transmission zero point 53 and the fourth transmission zero point 54 through the fourth resonant blind hole 14, the sixth resonant blind hole 16, and the eighth resonant blind hole 18 located in another vertical axis of the second topological structure 42.

[0026] The advantage of such an arrangement is that the six transmission zero points of the tenth-order six-transmission zero-point dielectric waveguide filter can be adjusted independently, thereby improving the out-of-band attenuation characteristics of the tenth-order six-transmission zero-point dielectric waveguide filter. Without increasing the order, the tenth-order six-transmission zero-point dielectric waveguide filter can obtain a better rectangular coefficient, which is beneficial to the miniaturization of the tenth-order six-transmission zero-point dielectric waveguide filter and can meet the requirements of modern communication systems for high out-of-band suppression, miniaturization, and low-cost dielectric filters.

[0027] The projection of the coupling slot 31 in the vertical direction is in any one of a straight line, an L shape, a T shape or a cross shape. In this embodiment, the coupling slot 31 includes a transverse slot 311 extending to the adjacent surfaces of two adjacent resonator bodies in the same longitudinal direction, and the adjacent surfaces of any two adjacent resonator bodies in the same longitudinal direction are provided with a transverse slot 311, so that the projection of the coupling slot 31 located between the third dielectric waveguide resonator 3, the fourth dielectric waveguide resonator 4, the fifth dielectric waveguide resonator 5, and the sixth dielectric waveguide resonator 6 in the vertical direction is in a straight line; at the same time, the coupling slot 31 also includes a transverse slot 311 extending to the adjacent surfaces of two adjacent resonator bodies in the same horizontal row. In two adjacent horizontal rows, only the adjacent surfaces of two adjacent resonator bodies in one horizontal row are provided with the longitudinal groove 312; specifically in this embodiment, the coupling through grooves 31 located between the first dielectric waveguide resonator 1, the second dielectric waveguide resonator 2, the third dielectric waveguide resonator 3, and the fourth dielectric waveguide resonator 4, between the fifth dielectric waveguide resonator 5, the sixth dielectric waveguide resonator 6, the seventh dielectric waveguide resonator 7, and the eighth dielectric waveguide resonator 8, and between the ninth dielectric waveguide resonator 9 and the tenth dielectric waveguide resonator 10 include the longitudinal groove 312, so that the projections of the coupling through grooves 31 at these three locations in the up-down direction are T-shaped.

[0028] In this embodiment, the coupling blind hole 32 is provided at the connection portion of two adjacent resonator bodies in the same horizontal row. Meanwhile, the connection portion of the two adjacent resonator bodies provided with the coupling blind hole 32 is not provided with the longitudinal groove 312. Specifically, in this embodiment, the coupling blind hole 32 is provided between the third dielectric waveguide resonator 3 and the fourth dielectric waveguide resonator 4, and between the seventh dielectric waveguide resonator 7 and the eighth dielectric waveguide resonator 8.

[0029] The coupling through slot 31 and the coupling blind hole 32 are used to achieve coupling between two adjacent dielectric waveguide resonators where they are located, and the coupling blind hole 32 is negative coupling.

[0030] To achieve input and output, in this embodiment, the tenth-order six-transmission zero dielectric waveguide filter further includes an input blind hole 61 and an output blind hole 62. The input blind hole 61 and the output blind hole 62 are opened on the back sides of two resonator bodies located at both ends in the same longitudinal direction. Specifically, the input blind hole 61 is arranged on the back side of the resonator body of the second dielectric waveguide resonator 2, and the input blind hole 61 is coaxial with the second resonant blind hole 12. The output blind hole 62 is arranged on the back side of the resonator body of the tenth dielectric waveguide resonator 10, and the output blind hole 62 is coaxial with the tenth resonant blind hole 20. The input and output functions of the input blind hole 61 and the output blind hole 62 are interchangeable.

[0031] like Figure 5 As shown, in this embodiment, the center frequency of the tenth-order six-transmission zero dielectric waveguide filter is 2600 MHz, the bandwidth is greater than 190 MHz, and the six transmission zeros enable the tenth-order six-transmission zero dielectric waveguide filter to achieve 15 dB out-of-band suppression at 5 MHz out-of-band, and at the same time achieve -95 dB out-of-band suppression at 2300-2400 MHz.

[0032] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A tenth-order six-transmission zero dielectric waveguide filter, comprising: A dielectric waveguide resonator, the dielectric waveguide resonator comprising a resonator body made of a solid dielectric material, a resonant blind hole opened on the upper surface of the resonator body and extending downward, and a conductive layer covering the surface of the resonator body and the inner wall of the resonant blind hole, and there are ten dielectric waveguide resonators in total; A coupling structure, wherein the coupling structure comprises a coupling through slot and a coupling blind hole which are opened on the upper surface of the resonator body and extend downward, and the inner wall of the coupling through slot and the coupling blind hole is covered with the conductive layer; Features: The ten dielectric waveguide resonators are arranged in a five-horizontal and two-vertical manner, the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are not covered with the conductive layer, and the adjacent surfaces of the resonator bodies on adjacent dielectric waveguide resonators are connected to each other and form a whole; A coupling through slot is provided at the cross connection formed by any four adjacent resonator bodies, and there is only one coupling blind hole on any four adjacent resonator bodies; The tenth-order six-transmission zero dielectric waveguide filter has three topological structures, each of which is composed of six dielectric waveguide resonators located in three adjacent horizontal rows. Each topological structure has two transmission zeros. The two topological structures located at both ends adjust the positions of the transmission zeros through two or three resonant blind holes located in the same vertical direction of the topological structure, and the topological structure located in the middle adjusts the position of the transmission zeros through the resonant blind holes located in another vertical direction of the topological structure.

2. The tenth-order six-transmission zero dielectric waveguide filter according to claim 1, characterized in that: The coupling through slot includes a transverse slot extending to adjacent surfaces of two adjacent resonator bodies in the same longitudinal direction.

3. The tenth-order six-transmission zero dielectric waveguide filter according to claim 2, characterized in that: Adjacent surfaces of any two adjacent resonator bodies in the same longitudinal direction are provided with the transverse grooves.

4. The tenth-order six-transmission zero dielectric waveguide filter according to claim 2, characterized in that: The coupling through slots further include longitudinal slots extending to adjacent surfaces of two adjacent resonator bodies in the same horizontal row.

5. The tenth-order six-transmission zero dielectric waveguide filter according to claim 4, characterized in that: In two adjacent horizontal rows, only the adjacent surfaces of two adjacent resonator bodies in one horizontal row are provided with the longitudinal grooves.

6. The tenth-order six-transmission zero dielectric waveguide filter according to claim 1, characterized in that: The projection of the coupling through groove in the up and down direction is in any one of a straight line shape, an L shape, a T shape or a cross shape.

7. The tenth-order six-transmission zero dielectric waveguide filter according to claim 4, characterized in that: The coupling blind hole is arranged at the connecting portion of two adjacent resonator bodies in the same horizontal row.

8. The tenth-order six-transmission zero dielectric waveguide filter according to claim 7, characterized in that: The connecting portion of two adjacent resonator bodies provided with the coupling blind hole is not provided with the longitudinal groove.

9. The tenth-order six-transmission zero dielectric waveguide filter according to claim 1, characterized in that: The resonant blind hole is arranged close to the center of the upper surface of the resonator body where the resonant blind hole is located.

10. The tenth-order six-transmission zero dielectric waveguide filter according to claim 1, characterized in that: The tenth-order six-transmission zero-point dielectric waveguide filter also includes an input blind hole and an output blind hole. The input blind hole and the output blind hole are opened on the back sides of the two resonator bodies located at both ends in the same longitudinal direction. The input blind hole and the output blind hole are coaxially arranged with the resonance blind hole.

Images