A ceramic dielectric filled waveguide filter

Abstract

A ceramic dielectric filled waveguide filter adopts a topological structure with staggered resonant cavities, comprising a ceramic dielectric block, a resonant cavity group, a groove, an input port and an output port. The ceramic dielectric block is provided with a resonant cavity group, the resonant cavity group comprises a plurality of resonant cavities arranged in parallel and staggered in two layers, a single resonant cavity in the upper layer is located on the central axis between two adjacent resonant cavities in the lower layer, a groove for adjusting the coupling amount of adjacent cavities is arranged between two adjacent resonant cavities in the same layer, a groove for adjusting the coupling amount of adjacent cavities is arranged between two resonant cavities at the same side ends of different layers, and the cross-coupling amount is jointly adjusted between two staggered resonant cavities on the same diagonal line of different layers through two staggered grooves on another diagonal line; in the present invention, the staggered resonant cavities realize a plurality of cross-coupling structures; the groove realizes a plurality of coupling effects between cavities, and realizes a filter with asymmetric left and right transmission zero points.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and relates to a dielectric-filled waveguide filter, and in particular to a ceramic dielectric-filled waveguide filter. Background Art

[0002] At present, in the 5G era, due to the requirements of Massive MIMO (massive antenna technology) for large-scale antenna integration, filters need to be more miniaturized and integrated. Under the condition of limited cavity size, due to the loss of their own materials, metal coaxial cavity filters and metal cavity dielectric filters cannot achieve very high Q values, resulting in limitations on various performance indicators.

[0003] In order to meet the miniaturization requirements of 5G base station filters, ceramic dielectric filters, which are easier to miniaturize, have become the mainstream solution. The electromagnetic wave resonance in the ceramic dielectric filter occurs inside the dielectric material, and the traditional metal cavity is replaced by a metal coating, so the volume will be smaller and the weight will be lighter. In addition, the ceramic dielectric filter has the advantages of high Q value, good frequency selection characteristics, good operating frequency stability, low insertion loss, and low high and low temperature drift characteristics.

[0004] The electromagnetic principle of dielectric filled waveguide filter is the same as that of traditional metal cavity waveguide filter. The difference is that dielectric filled waveguide filter generally uses functional ceramic medium, while traditional metal cavity waveguide filter uses air. The dielectric constant of functional ceramic medium is different from that of air. As a new type of waveguide filter, the key design technology of dielectric filled waveguide filter lies in the realization of topological structure and transmission zero point.

[0005] However, the existing dielectric-filled waveguide filter has a structure that, first, has a plurality of parallel and symmetrical resonant cavities;

[0006] Second, the resonant cavity is a "T"-shaped groove, a "cross"-shaped groove, or a "I"-shaped groove;

[0007] Thirdly, the coupling amount between two adjacent cavities is adjusted by a "T"-shaped groove, a "cross"-shaped groove or a "I"-shaped groove;

[0008] Fourth, in addition, the frequency can be adjusted by adjusting the size and depth of the holes at each resonant cavity;

[0009] Fifth, coupling between several cavities on one side is achieved through the "T"-shaped groove on one side to realize two transmission zero points, and coupling between several cavities on the other side is achieved through the "T"-shaped groove on the other side to realize two transmission zero points.

[0010] However, the existing ceramic dielectric filled waveguide solution has the following disadvantages:

[0011] First, the left and right transmission zero points achieved by the above structure are symmetrical, and can only be applied to filters with low requirements for out-of-band near-end suppression and relatively symmetrical out-of-band suppression;

[0012] Second, due to structural limitations, the existing scheme cannot achieve cross-coupling between cross-resonant cavities, resulting in the inability to achieve a transmission zero point with stronger coupling;

[0013] Third, for filter performance with high proximal suppression, more zero point requirements, and asymmetric left and right transmission zero points, such as the zero point being high on the left and low on the right, or low on the left and high on the right, the existing structure cannot meet the requirements. Summary of the invention

[0014] In view of this, in order to solve the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a ceramic dielectric filled waveguide filter, which adopts a topological structure with staggered resonant cavities, and the staggered resonant cavities are easy to realize multiple cross-coupling structures; through the dispersed arrangement of I-shaped grooves or Z-shaped grooves, the grooves are flexibly distributed to achieve a variety of coupling effects between cavities, thereby realizing a filter with asymmetric left and right transmission zero points; the overall structure is simple and novel, accurate and efficient, ensuring various performance indicators, meeting higher usage requirements, more in line with modern needs, and more practical.

[0015] To achieve the above purpose, the technical solution adopted by the present invention is:

[0016] A ceramic dielectric filled waveguide filter adopts a topological structure with staggered resonant cavities. The waveguide filter comprises a ceramic dielectric block, a resonant cavity group, a groove, an input port, and an output port. The resonant cavity group is arranged on the ceramic dielectric block. The resonant cavity group comprises a plurality of resonant cavities arranged in parallel and staggered in two layers. A single resonant cavity in the upper layer is located on the central axis between two adjacent resonant cavities in the lower layer. A groove for adjusting the coupling amount of adjacent cavities is arranged between two adjacent resonant cavities in the same layer. A groove for adjusting the coupling amount of adjacent cavities is arranged between two resonant cavities at the same side ends of different layers. The cross-coupling amount is jointly adjusted between two staggered resonant cavities on the same diagonal line of different layers through two staggered grooves on another diagonal line. The surface of the ceramic dielectric block is covered with a layer of metallic silver. The input port and the output port are arranged in parallel on the surface of one side of the ceramic dielectric block.

[0017] Furthermore, the surface of the ceramic dielectric block is covered with silver or electroplated with silver.

[0018] Furthermore, the input port and the output port are both cylindrical blind holes.

[0019] Furthermore, the grooves are dispersedly arranged straight grooves or Z-shaped grooves.

[0020] Furthermore, the resonant cavity group includes at least 3 groups of resonant cavities.

[0021] Furthermore, the resonant cavity is in the form of a blind hole or a non-blind hole.

[0022] Furthermore, the number of the resonant cavity and the number of the grooves are both 9.

[0023] Furthermore, the resonant cavities are respectively the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, the fifth resonant cavity, the sixth resonant cavity, the seventh resonant cavity, the eighth resonant cavity, and the ninth resonant cavity, and the grooves are respectively the first groove, the second groove, the third groove, the fourth groove, the fifth groove, the sixth groove, the seventh groove, the eighth groove, and the ninth groove.

[0024] The beneficial effects of the present invention are:

[0025] The ceramic dielectric filled waveguide filter of the present invention has a simple and novel structure, is accurate and efficient, ensures various performance indicators, meets higher use requirements, is more in line with modern needs, and is more practical. It has the following advantages:

[0026] First, the topological structure of the resonant cavity staggered is adopted. The staggered arrangement of the resonant cavity makes it easy to realize multiple cross-coupling structures.

[0027] Secondly, the coupling structure of the present invention realizes the coupling effect between various cavities through the dispersed arrangement of straight grooves or Z-shaped grooves, and the grooves are flexibly distributed, thereby realizing a filter with asymmetric left and right transmission zero points;

[0028] Thirdly, it can realize both adjacent cavity coupling structure and non-adjacent cavity cross-coupling structure, that is, realize cross-coupling between cross-resonant cavities, avoid the problem of unable to realize transmission zero point with stronger coupling, and the overall structure is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the top structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the bottom structure of the present invention;

[0032] Figure 3 Schematic diagram of the topological structure of the staggered arrangement of the resonant cavity;

[0033] Markings in the figure: 1. Ceramic dielectric block, 2. Resonant cavity, 201. First resonant cavity, 202. Second resonant cavity, 203. Third resonant cavity, 204. Fourth resonant cavity, 205. Fifth resonant cavity, 206. Sixth resonant cavity, 207. Seventh resonant cavity, 208. Eighth resonant cavity, 209. Ninth resonant cavity, 3. Groove, 301. First groove, 302. Second groove, 303. Third groove, 304. Fourth groove, 305. Fifth groove, 306. Sixth groove, 307. Seventh groove, 308. Eighth groove, 309. Ninth groove, 4. Input port, 5. Output port. DETAILED DESCRIPTION

[0034] The following specific examples are given to further clearly, completely and in detail illustrate the technical solution of the present invention. This example is the best example based on the technical solution of the present invention, but the protection scope of the present invention is not limited to the following examples.

[0035] A ceramic dielectric filled waveguide filter, the waveguide filter adopts a topological structure of staggered resonant cavities, and the staggered resonant cavities 2 are easy to realize multiple cross-coupling structures; the waveguide filter comprises a ceramic dielectric block 1, a resonant cavity group, a groove 3, an input port 4, and an output port 5. The resonant cavity group is arranged on the ceramic dielectric block 1, and the resonant cavity group comprises a plurality of resonant cavities 2 arranged in parallel and staggered in two layers, a single resonant cavity 2 in the upper layer is located on the central axis between two adjacent resonant cavities 2 in the lower layer, a groove 3 for adjusting the coupling amount of adjacent cavities is arranged between two adjacent resonant cavities 2 in the same layer, and a groove 3 for adjusting the coupling amount of adjacent cavities is arranged between two resonant cavities 2 at the same side ends of different layers. Two staggered resonant cavities 2 on the same diagonal of different layers are used to jointly adjust the cross-coupling amount through two staggered grooves 3 located on another diagonal. The technical solution of the present invention can realize both adjacent cavity coupling structure and non-adjacent cavity cross-coupling structure, that is, cross-coupling between cross-resonant cavities, avoiding the problem of being unable to achieve a stronger coupling transmission zero point, and the overall stability and reliability; further, the grooves 3 are flexibly distributed to achieve a variety of coupling effects between cavities, thereby realizing a filter with asymmetric left and right transmission zero points; the surface of the ceramic dielectric block 1 is covered with a layer of metallic silver, and an input port 4 and an output port 5 are arranged in parallel on the surface of one side of the ceramic dielectric block 1.

[0036] Furthermore, the surface of the ceramic dielectric block 1 is covered with silver or electroplated with silver.

[0037] Furthermore, the input port 4 and the output port 5 are both cylindrical blind holes.

[0038] Furthermore, the grooves 3 are dispersedly arranged straight grooves or Z-shaped grooves. The grooves are flexibly distributed to achieve a variety of coupling effects between cavities, thereby realizing a filter with asymmetric left and right transmission zero points.

[0039] Furthermore, the resonant cavity group includes at least three groups of resonant cavities 2 .

[0040] Furthermore, the resonant cavity 2 is in the form of a blind hole or a non-blind hole.

[0041] Furthermore, in this embodiment, the number of the resonant cavity 2 and the number of the grooves 3 are both 9.

[0042] For ease of description, in this embodiment, further, the resonant cavity 2 is respectively a first resonant cavity 201, a second resonant cavity 202, a third resonant cavity 203, a fourth resonant cavity 204, a fifth resonant cavity 205, a sixth resonant cavity 206, a seventh resonant cavity 207, an eighth resonant cavity 208, and a ninth resonant cavity 209, and the grooves 3 are respectively a first groove 301, a second groove 302, a third groove 303, a fourth groove 304, a fifth groove 305, a sixth groove 306, a seventh groove 307, an eighth groove 308, and a ninth groove 309.

[0043] In this embodiment, the nine resonant cavities 2 are arranged in an interlaced manner in two parallel layers, upper and lower, and the nine grooves 3 are dispersedly arranged between the resonant cavities 2. The single resonant cavity 2 in the upper layer is located on the central axis between two adjacent resonant cavities 2 in the lower layer, grooves 3 for adjusting the coupling amount of adjacent cavities are arranged between two adjacent resonant cavities 2 in the same layer, grooves 3 for adjusting the coupling amount of adjacent cavities are arranged between two resonant cavities 2 at the same side ends of different layers, and the cross-coupling amount is adjusted between two interlaced resonant cavities 2 on a diagonal line of different layers through two interlaced grooves 3 on another diagonal line;

[0044] For ease of description, in this embodiment, further, a topological structure in which 9 resonant cavities 2 are arranged in a staggered manner is set: 4 resonant cavities 2 are set on the upper layer, namely: the third resonant cavity 203, the fourth resonant cavity 204, the fifth resonant cavity 205, and the sixth resonant cavity 206; 5 resonant cavities 2 are set on the lower layer, namely: the second resonant cavity 202, the first resonant cavity 201, the ninth resonant cavity 209, the eighth resonant cavity 208, and the seventh resonant cavity 207; the third resonant cavity 203 is located above the central axis between the second resonant cavity 202 and the first resonant cavity 201 , the fourth resonant cavity 204 is located above the central axis between the first resonant cavity 201 and the ninth resonant cavity 209, the fifth resonant cavity 205 is located above the central axis between the ninth resonant cavity 209 and the eighth resonant cavity 208, and the sixth resonant cavity 206 is located above the central axis between the eighth resonant cavity 208 and the seventh resonant cavity 207; therefore, in the technical solution, the resonant cavity group includes two layers of parallel and staggered resonant cavities 2, and the single resonant cavity 2 in the upper layer is located on the central axis between two adjacent resonant cavities 2 in the lower layer;

[0045] For the convenience of description, in this embodiment, a coupling structure is further provided:

[0046] Adjacent cavity coupling structural relationship: the first groove 301 adjusts the adjacent cavity coupling amount between the second resonant cavity 202 and the third resonant cavity 203, the second groove 302 adjusts the adjacent cavity coupling amount between the first resonant cavity 201 and the second resonant cavity 202, the third groove 303 adjusts the adjacent cavity coupling amount between the eighth resonant cavity 208 and the ninth resonant cavity 209, the fourth groove 304 adjusts the adjacent cavity coupling amount between the seventh resonant cavity 207 and the fourth resonant cavity 208, the fifth groove 305 adjusts the adjacent cavity coupling amount between the sixth resonant cavity 206 and the seventh resonant cavity 207, the sixth groove 306 adjusts the adjacent cavity coupling amount between the fifth resonant cavity 205 and the sixth resonant cavity 206, the seventh groove 307 adjusts the adjacent cavity coupling amount between the fourth resonant cavity 204 and the fifth resonant cavity 205, and the eighth groove 308 adjusts the adjacent cavity coupling amount between the third resonant cavity 203 and the fourth resonant cavity 204;

[0047] Relationship of the cross-coupling structure of non-adjacent cavities: the eighth groove 308 and the second groove 302 jointly adjust the cross-coupling amount between the first resonant cavity 201 and the third resonant cavity 203, the eighth groove 308 and the ninth groove 309 jointly adjust the cross-coupling amount between the first resonant cavity 201 and the fourth resonant cavity 204, the seventh groove 307 and the ninth groove 309 jointly adjust the cross-coupling amount between the fourth resonant cavity 204 and the ninth resonant cavity 209, the seventh groove 307 and the third groove 303 jointly adjust the cross-coupling amount between the fifth resonant cavity 205 and the ninth resonant cavity 209, the third groove 303 and the sixth groove 306 jointly adjust the cross-coupling amount between the fifth resonant cavity 205 and the eighth resonant cavity 208, the fourth groove 304 and the sixth groove 306 jointly adjust the cross-coupling amount between the sixth resonant cavity 206 and the eighth resonant cavity 208;

[0048] Therefore, in this technical solution, grooves 3 for adjusting the coupling amount of adjacent cavities are set between adjacent resonant cavities 2 in the same layer, grooves 3 for adjusting the coupling amount of adjacent cavities are set between two resonant cavities 2 at the same side ends of different layers, and the cross-coupling amount is jointly adjusted between two staggered resonant cavities 2 on the same diagonal line of different layers through two staggered grooves 3 located on the other diagonal line.

[0049] In summary, a ceramic dielectric filled waveguide filter of the present invention adopts a topological structure with staggered resonant cavities, and the staggered resonant cavities are easy to realize multiple cross-coupling structures; through the dispersed arrangement of I-shaped grooves or Z-shaped grooves, the grooves are flexibly distributed to achieve a variety of coupling effects between cavities, thereby realizing a filter with asymmetric left and right transmission zero points; the overall structure is simple and novel, accurate and efficient, ensuring various performance indicators, meeting higher use requirements, more in line with modern needs, and more practical.

[0050] The above shows and describes the main features, basic principles and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements according to actual conditions, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ceramic dielectric filled waveguide filter, characterized in that: The waveguide filter adopts a topological structure with a resonant cavity staggered, and comprises a ceramic dielectric block (1), a resonant cavity group, a groove (3), an input port (4), and an output port (5). The resonant cavity group is arranged on the ceramic dielectric block (1), and the resonant cavity group comprises a plurality of resonant cavities (2) arranged in parallel and staggered in two layers, a single resonant cavity (2) in the upper layer is located on the central axis between two adjacent resonant cavities (2) in the lower layer, grooves (3) for adjusting the coupling amount of adjacent cavities are arranged between two adjacent resonant cavities (2) in the same layer, and grooves (3) for adjusting the coupling amount of adjacent cavities are arranged between two adjacent resonant cavities (2) in different layers. A groove (3) for adjusting the coupling amount of adjacent cavities is provided between two resonant cavities (2) at the same side ends of the ceramic dielectric block (1); in the resonant cavity group, four resonant cavities that are located closest to each other form a quadrilateral; in the quadrilateral, two staggered resonant cavities (2) located on the same diagonal line of different layers are used to jointly adjust the cross-coupling amount through two staggered grooves (3) located on another diagonal line; the surface of the ceramic dielectric block (1) is covered with a layer of metallic silver; and an input port (4) and an output port (5) are provided in parallel on the surface of one side of the ceramic dielectric block (1); The grooves (3) are dispersedly arranged straight grooves or Z-shaped grooves to realize a filter with asymmetric left and right transmission zero points; the surface of the ceramic dielectric block (1) is covered with silver or electroplated with silver.

2. A ceramic dielectric filled waveguide filter according to claim 1, characterized in that: The input port (4) and the output port (5) are both cylindrical blind holes.

3. The ceramic dielectric filled waveguide filter according to claim 1, characterized in that: The resonant cavity group comprises at least three groups of resonant cavities (2).

4. The ceramic dielectric filled waveguide filter according to claim 1, characterized in that: The resonant cavity (2) is in the form of a blind hole or a non-blind hole.

5. The ceramic dielectric filled waveguide filter according to claim 1, characterized in that: The number of the resonant cavity (2) and the number of the grooves (3) are both 9.

6. The ceramic dielectric filled waveguide filter according to claim 5, characterized in that: The resonant cavities (2) are respectively a first resonant cavity (201), a second resonant cavity (202), a third resonant cavity (203), a fourth resonant cavity (204), a fifth resonant cavity (205), a sixth resonant cavity (206), a seventh resonant cavity (207), an eighth resonant cavity (208), and a ninth resonant cavity (209); and the grooves (3) are respectively a first groove (301), a second groove (302), a third groove (303), a fourth groove (304), a fifth groove (305), a sixth groove (306), a seventh groove (307), an eighth groove (308), and a ninth groove (309).

Images