CN218569184U

CN218569184U - Dielectric filter

Info

Publication number: CN218569184U
Application number: CN202222318910.7U
Authority: CN
Inventors: 吴腾杰; 吴飞甲; 张元元; 邵国云; 江琴; 蒋佳林
Original assignee: Jiaxing Glead Electronics Co ltd
Current assignee: Jiaxing Glead Electronics Co ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2023-03-03
Anticipated expiration: 2032-09-01

Abstract

The utility model relates to a dielectric filter, including the dielectric block, between the open circuit terminal surface and the short circuit face of dielectric block, the interval is equipped with one row of perforating holes, still is equipped with signal input electrode and signal output electrode on the lower surface, is equipped with a plurality of metal blocks and many metal segments on the open circuit terminal surface, and every metal block is around corresponding perforating hole setting, and the metal segment includes sideline, first vertical straightway metal level, first horizontal straightway metal level and second vertical straightway metal level; the side lines are coated on the left side, the right side and the upper side of the open end face, the first longitudinal straight-line section metal layer is arranged between the two leftmost metal blocks on the open end face, the second longitudinal straight-line section metal layer is arranged between the two rightmost metal blocks on the open end face, and the first transverse straight-line section metal layer is arranged above the plurality of right metal blocks on the open end face. The utility model discloses satisfy outside the passband under the condition of minimum suppression ratio, reduce the volume of product, solve the too big problem of dielectric block volume.

Description

Dielectric filter

Technical Field

The utility model relates to a wave filter technical field, more specifically say, relate to a dielectric filter.

Background

In general, a dielectric filter is configured by a dielectric block made of a ceramic material and a plurality of coaxial resonance holes penetrating through the dielectric block. Dielectric filters require a minimum insertion loss in the pass band and a minimum attenuation ratio outside the pass band. When a communication system is designed on a device, the device is required to be smaller and smaller, and when the volume of a dielectric block is reduced, if the pattern design on the surface of a filter is unreasonable, the characteristic of the filter is influenced, and the quality of a communication signal is further influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, an object of the present invention is to provide a dielectric filter, which has a reasonable design of the end face pattern of the filter, and has a better electrical performance.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

a dielectric filter comprises an integrated dielectric block made of ceramic materials, wherein an open end face, a short circuit face, a lower surface, an upper surface, a left side face and a right side face are arranged on the dielectric block, the open end face and the short circuit face are oppositely arranged, metal layers are coated on the short circuit face, the lower surface, the upper surface, the left side face and the right side face, and the lower surface is also provided with a signal input electrode and a signal output electrode; a row of through holes are arranged between the open end surface and the short circuit surface of the dielectric block at intervals, an inner metal layer is coated inside each through hole, and the inner metal layer in each through hole is electrically connected with the metal layer of the short circuit surface; an uncoated area A and an uncoated area B are respectively arranged between the signal input electrode and the signal output electrode and between the metal layer on the lower surface, a metal pattern layer is arranged on the open end surface and comprises a plurality of metal blocks and a plurality of metal wire sections, each metal block surrounds the corresponding through hole, the metal blocks are electrically connected with the inner metal layer in the through holes, and each metal wire section comprises a sideline, a first longitudinal straightway metal layer, a first transverse straightway metal layer and a second longitudinal straightway metal layer; the sidelines are coated on the left side, the right side and the upper side of the open end face and are respectively connected with the left side, the right side and the upper surface; the first longitudinal straight-line section metal layer is arranged between the two leftmost metal blocks on the open end face, two ends of the first longitudinal straight-line section metal layer are respectively connected with the sideline and the metal layer on the lower surface, the second longitudinal straight-line section metal layer is arranged between the two rightmost metal blocks on the open end face, one end of the second longitudinal straight-line section metal layer is connected to the metal layer on the lower surface, and the first transverse straight-line section metal layer is arranged above the plurality of metal blocks on the right side of the open end face.

As a preferable scheme: the number of the metal blocks is four, and the four metal blocks are respectively a rectangular metal block A, a rectangular metal block B, a rectangular metal block C and a rectangular metal block D from left to right; the perforating hole is four, turns right by a left side and is resonance hole A, resonance hole B, resonance hole C, resonance hole D respectively.

As a preferable scheme: the periphery of the rectangular metal block A is provided with an uncoated region C, the periphery of the rectangular metal block D is provided with an uncoated region D, the uncoated region C is connected with the uncoated region A, and the uncoated region D is connected with the uncoated region B.

As a preferable scheme: the first transverse straight-line metal layer is arranged on the upper portions of the rectangular metal blocks B, the rectangular metal blocks C and the rectangular metal blocks D.

As a preferable scheme: the first longitudinal straight-line section metal layer is L-shaped and is arranged between the rectangular metal block A and the rectangular metal block B.

As a preferable scheme: the second longitudinal straight-line section metal layer is in a radial L shape and is arranged between the rectangular metal block C and the rectangular metal block D.

Compared with the prior art, the beneficial effects of the utility model are that:

the technical scheme of the utility model under the condition that satisfies the minimum suppression ratio outside the passband, reduce the volume of product, solve the too big problem of dielectric block volume, can dwindle the dielectric block volume from 8.3 x 3.0 x 3.7mm to 6.0 x 2.0 x 2.7mm. The technical scheme of the utility model optimized the wave filter structural characteristic, with the external wide band width that reaches needs of metal pattern on the open face of wave filter, coupling capacitance and coupling inductance through the adjustment metal pattern, the wave filter both ends are external two zeros, improve the effect of near-end outband attenuation ratio.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments of the application are intended to be illustrative of the application and are not intended to limit the application.

Fig. 1 is an equivalent circuit diagram of the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention;

fig. 3 is a schematic bottom view (right front) of the present invention;

fig. 4 is a schematic bottom view (right rear side) of the present invention;

fig. 5 is a graph illustrating the measurement of the filter according to the present invention.

The reference signs are: 200. a dielectric block; 201. an open end face; 202. a short circuit plane; 203. a lower surface; 204. an upper surface; 205. a left side surface; 206. a right side surface; 207. a resonant hole A; 208. a resonance hole B; 209. a resonance hole C; 210. a resonance hole D; 211. a signal input electrode; 212. a signal output electrode; 213. an uncoated region A; 214. an uncoated region B; 215. a rectangular metal block A; 216. a rectangular metal block B; 217. a rectangular metal block C; 218. a rectangular metal block D; 219. an uncoated region C; 220. an uncoated region D; 221. a first longitudinal straight-line section metal layer; 222. a first lateral rectilinear metal layer; 223. a second longitudinal straight-line section metal layer; 224. a side line; 225. an inner metal layer.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, elements, and/or combinations thereof, unless the context clearly indicates otherwise.

Furthermore, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The invention will be further explained with reference to the following embodiments and drawings:

a dielectric filter as shown in fig. 2 to 4 comprises an integral dielectric block 200 made of a ceramic material, wherein the dielectric block 200 is provided with an open end surface 201, a short-circuit surface 202, a lower surface 203, an upper surface 204, a left side surface 205 and a right side surface 206, the open end surface 201 is arranged opposite to the short-circuit surface 202, and the short-circuit surface 202, the lower surface 203, the upper surface 204, the left side surface 205 and the right side surface 206 are coated with metal layers which are used as shielding electrodes or grounded external metal shield conductors.

The lower surface 203 is also provided with a signal input electrode 211 and a signal output electrode 212; a row of through holes are arranged between the open end surface 201 and the short circuit surface 202 of the dielectric block 200 at intervals, an inner metal layer 225 is coated inside each through hole, and the inner metal layer 225 in each through hole is electrically connected with the metal layer of the short circuit surface 202; an uncoated area A213 and an uncoated area B214 are further respectively arranged between the signal input electrode 211 and the signal output electrode 212 and the metal layers of the lower surface 203, a metal pattern layer is arranged on the open end surface 201 and comprises a plurality of metal blocks and a plurality of metal line segments, each metal block is arranged around a corresponding through hole and electrically connected with the inner metal layer 225 in the through hole, and each metal line segment comprises a sideline 224, a first longitudinal straightway metal layer 221, a first transverse straightway metal layer 222 and a second longitudinal straightway metal layer 223; the sidelines 224 are coated on the left side, the right side and the upper side of the open end face 201, and the sidelines 224 are respectively connected with the left side 205, the right side 206 and the upper surface 204; the first longitudinal straight-line section metal layer 221 is disposed between the two leftmost metal blocks on the open end surface 201, two ends of the first longitudinal straight-line section metal layer are respectively connected to the edge line 224 and the metal layer on the lower surface 203, the second longitudinal straight-line section metal layer 223 is disposed between the two rightmost metal blocks on the open end surface 201, one end of the second longitudinal straight-line section metal layer is connected to the metal layer on the lower surface 203, and the first transverse straight-line section metal layer 222 is disposed above the multiple metal blocks on the right side of the open end surface 201.

The number of the metal blocks is four, and the metal blocks from left to right are a rectangular metal block A215, a rectangular metal block B216, a rectangular metal block C217 and a rectangular metal block D218 respectively; the number of the through holes is four, and the through holes are respectively a resonance hole A207, a resonance hole B208, a resonance hole C209 and a resonance hole D210 from left to right. An uncoated region C219 is arranged on the periphery of the rectangular metal block A215, an uncoated region D220 is arranged on the periphery of the rectangular metal block D218, the uncoated region C219 is connected with the uncoated region A213, and the uncoated region D220 is connected with the uncoated region B214.

The signal input electrode 211 is located in an uncoated area a213 on the lower surface 203 corresponding to the resonance hole a207, and the signal input electrode 211 connects a signal to the resonance hole a207 as a resonator through the uncoated area a213 on the lower surface 203 and an uncoated area C219 on the open end surface 201. Similarly, the signal output electrode 212 passes through the uncoated region B214 on the lower surface 203 corresponding to the resonance hole D210, so that the signal output electrode 212 connects a signal to the resonance hole 210D as the same resonator through the uncoated region B214 on the lower surface 203 and the uncoated region D220 on the open end surface 201.

The first lateral rectilinear metal layer 222 is disposed on top of the rectangular metal blocks B216, C217, D218. The first longitudinal straight-line segment metal layer 221 is L-shaped and is disposed between the rectangular metal blocks a215 and B216. The second longitudinal straight-line segment metal layer 223 is radial L-shaped and is arranged between the rectangular metal blocks C217 and D218.

The utility model discloses an equivalent circuit is as shown IN fig. 1, input IN represents signal input electrode 211, output OUT represents signal output electrode 212, resonance hole A207 is as first syntonizer R1, distance equivalent capacitance Cin between signal input electrode 211 and the first syntonizer R1, resonance hole B208 is as second syntonizer R2, distance equivalent inductance L1 between first syntonizer R1 and the second syntonizer R2, resonance hole C209 is as third syntonizer R3, distance equivalent capacitance C1 between second syntonizer R2 and the third syntonizer R3, resonance hole D210 is as fourth syntonizer R4, distance equivalent inductance L2 between third syntonizer R3 and the fourth syntonizer R4, first syntonizer R1 and fourth syntonizer R4 form equivalent capacitance C2, C3, equivalent inductance L3 through first horizontal straight line metal layer 222, distance equivalent capacitance t between signal output electrode 212 and the fourth syntonizer R4, the utility model discloses a filter is surveyed as shown IN fig. 5.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, and that any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. A dielectric filter comprises an integrated dielectric block (200) made of ceramic materials, wherein an open end face (201), a short circuit face (202), a lower surface (203), an upper surface (204), a left side face (205) and a right side face (206) are arranged on the dielectric block (200), the open end face (201) and the short circuit face (202) are arranged oppositely, metal layers are coated on the short circuit face (202), the lower surface (203), the upper surface (204), the left side face (205) and the right side face (206), and a signal input electrode (211) and a signal output electrode (212) are further arranged on the lower surface (203); a row of through holes are arranged between the open end face (201) and the short circuit face (202) of the dielectric block (200) at intervals, an inner metal layer (225) is coated inside each through hole, and the inner metal layer (225) in each through hole is electrically connected with the metal layer of the short circuit face (202); the method is characterized in that: an uncoated area A (213) and an uncoated area B (214) are further respectively arranged between the signal input electrode (211), the signal output electrode (212) and the metal layer of the lower surface (203), a metal pattern layer is arranged on the open end surface (201), the metal pattern layer comprises a plurality of metal blocks and a plurality of metal line sections, each metal block is arranged around a corresponding through hole and is electrically connected with the inner metal layer (225) in the through hole, and each metal line section comprises a side line (224), a first longitudinal straight-line metal layer (221), a first transverse straight-line metal layer (222) and a second longitudinal straight-line metal layer (223); the sidelines (224) are coated on the left side, the right side and the upper side of the open end face (201), and the sidelines (224) are respectively connected with the left side face (205), the right side face (206) and the upper surface (204); the first longitudinal straight-line section metal layer (221) is arranged between the two leftmost metal blocks on the open end face (201), two ends of the first longitudinal straight-line section metal layer are respectively connected with the border line (224) and the metal layer of the lower surface (203), the second longitudinal straight-line section metal layer (223) is arranged between the two rightmost metal blocks on the open end face (201), one end of the second longitudinal straight-line section metal layer is connected to the metal layer of the lower surface (203), and the first transverse straight-line section metal layer (222) is arranged above the metal blocks on the right side of the open end face (201).

2. A dielectric filter according to claim 1, characterized in that: the number of the metal blocks is four, and the four metal blocks are respectively a rectangular metal block A (215), a rectangular metal block B (216), a rectangular metal block C (217) and a rectangular metal block D (218) from left to right; the number of the through holes is four, and the through holes are respectively a resonance hole A (207), a resonance hole B (208), a resonance hole C (209) and a resonance hole D (210) from left to right.

3. A dielectric filter according to claim 2, wherein: an uncoated region C (219) is arranged on the periphery of the rectangular metal block A (215), an uncoated region D (220) is arranged on the periphery of the rectangular metal block D (218), the uncoated region C (219) is connected with the uncoated region A (213), and the uncoated region D (220) is connected with the uncoated region B (214).

4. A dielectric filter according to claim 2, wherein: the first transverse straight-line metal layer (222) is arranged on the upper parts of the rectangular metal blocks B (216), C (217) and D (218).

5. A dielectric filter according to claim 1, characterized in that: the first longitudinal straight-line section metal layer (221) is L-shaped and is arranged between the rectangular metal block A (215) and the rectangular metal block B (216).

6. A dielectric filter according to claim 1, characterized in that: the second longitudinal straight-line section metal layer (223) is radial L-shaped and is arranged between the rectangular metal block C (217) and the rectangular metal block D (218).