CN209963191U

CN209963191U - Dielectric filter containing negative coupling structure

Info

Publication number: CN209963191U
Application number: CN201921035215.1U
Authority: CN
Inventors: 朱琦; 倪玉荣
Original assignee: Jiangsu Canqin Science And Technology Co Ltd
Current assignee: Jiangsu Canqin Science And Technology Co Ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-01-17
Anticipated expiration: 2029-07-04

Abstract

The application discloses dielectric filter containing negative coupling structure, include the body of being made by solid-state dielectric material, the body surface cladding has the conducting layer, the body is provided with 2 at least resonance blind holes, the body is lieing in the back of resonance blind hole is formed with the blind groove of coupling, the blind groove bottom of coupling is formed with non-metallization groove, the body in one side in the blind groove of coupling is formed with isolation through-hole or isolation tank, isolation through-hole or isolation tank internal surface cover have the conducting layer. The utility model discloses a dielectric filter implementation mode is simple and convenient, with low costs, the reliability is high, the flexibility is good, and the negative coupling structure that it contains can be used for satisfying the demand that various modern communication system restrain the high outband of wave filter.

Description

Dielectric filter containing negative coupling structure

Technical Field

The present invention relates to filters, and more particularly, to a dielectric filter including a negative coupling structure.

Background

The filter used for modern communication system needs to form strong suppression at the place close to the edge of the filter passband due to the limitation of frequency spectrum resources, and the current general method is to design a strong zero point at the edge of the filter, so that the rectangular coefficient of the filter is greatly improved.

The use of a filter topology comprising a plurality of positive and negative coupling structures results in a filter topology that meets the above requirements. Therefore, the filter negative coupling structure is an essential element constituting a modern communication filter.

In a traditional dielectric filter, for example, CN104871364B authorized by a person in 2019, 4, 9 and 9, a circular negative coupling window is formed on the joint surface of two dielectric blocks by ablation or printing, so as to implement a transmission zero point. The implementation method has the following disadvantages that firstly, 2 dielectric blocks need to be processed, and the cost is high; secondly, the machining precision and the assembling precision of 2 medium blocks are very high, and the machining is not facilitated; thirdly, 2 dielectric blocks need to be connected together by adopting welding or other processes, so that the reliability is poor and the number of processing procedures is large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a negative coupling structure wave filter and manufacturing method to overcome prior art's not enough.

In order to achieve the above object, the present invention provides the following technical solutions.

The embodiment of the application discloses dielectric filter containing negative coupling structure, include the body of being made by solid-state dielectric material, the body surface cladding has the conducting layer, the body is provided with 2 at least resonance blind holes, the body is lieing in the back of resonance blind hole is formed with the blind groove of coupling, the blind tank bottom of coupling is formed with non-metallization groove, the body in one side of the blind groove of coupling is formed with isolation through-hole or isolation tank, isolation through-hole or isolation tank internal surface cover have the conducting layer.

Preferably, in the above dielectric filter including a negative coupling structure, the coupling blind slot does not intersect with the resonant blind hole.

Preferably, in the above dielectric filter including the negative coupling structure, the non-metallization groove has a closed ring shape, and the non-metallization groove divides the conductive layer at the bottom of the coupling blind groove to form the conductor capacitor flying bar.

Preferably, in the above dielectric filter including a negative coupling structure, the body further includes one or more resonator isolation grooves formed with a plurality of coupling ribs.

Preferably, in the above dielectric filter including a negative coupling structure, the solid dielectric material is ceramic.

Preferably, in the dielectric filter including the negative coupling structure, the conductive layer is made of silver or copper.

Preferably, in the dielectric filter including the negative coupling structure, the body is integrally formed and sintered at a high temperature.

Preferably, in the dielectric filter including the negative coupling structure, the conductive layer is attached to the surface of the body by spraying, dipping, printing or electroplating.

Preferably, in the above dielectric filter including a negative coupling structure, the non-metalized groove is formed by laser etching.

Compared with the prior art, the utility model adopts the technology of integral molding and high-temperature sintering, and can manufacture the dielectric filter body with low cost and high reliability; the laser etching technology is adopted to form a conductor capacitor flying rod, so that a negative coupling structure required by various zero points of the filter is effectively formed; the negative coupling strength of the filter can be effectively adjusted by adjusting the parameters such as the shape, the size, the position and the like of the capacitor flying rod and the isolation hole or the isolation groove; the utility model discloses the effectual demand that has satisfied modern communication equipment to high outband suppression, high reliability, low-cost dielectric filter.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a cross-sectional view of a dielectric filter including a negative coupling structure according to a first embodiment of the present invention;

fig. 2 is a partial top view of a dielectric filter including a negative coupling structure according to a first embodiment of the present invention;

fig. 3 is a partial bottom view of a dielectric filter including a negative coupling structure according to a first embodiment of the present invention;

fig. 4 is a partial bottom view of a dielectric filter including a negative coupling structure according to a second embodiment of the present invention;

fig. 5 shows an S-parameter curve according to a first embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 simplification of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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 in specific cases to those skilled in the art.

In a first embodiment, referring to fig. 1 to 3, a dielectric filter including a negative coupling structure includes a body 101 made of a solid dielectric material, a surface of the body 101 is coated with a conductive layer 103, the body 101 is provided with 4 resonant

blind holes

102a, 102b, 102c, and 102d, and the number and position of the resonant blind holes can be adjusted according to the index requirements of the filter, which is not limited in this embodiment.

Further, a coupling blind groove 104 is formed on the back surface of the body 101, which is located at the resonance blind hole, a non-metallization groove 105 is formed at the bottom of the coupling blind groove 104, an isolation through hole 107 is formed on one side of the body 101, which is located at the coupling blind groove 104, and a conductive layer 103 covers the inner surface of the isolation through hole 107.

It should be noted that the isolation via 107 can be located on either side of the coupling blind slot 104, and the effect is the same, so the location of the isolation via 107 with respect to the coupling blind slot 104 is not limited herein.

Further, the coupling blind slot 104 does not intersect with the adjacent resonant

blind holes

102a or 102b, etc.

In the embodiment, the sum of the depth of the coupling blind slot 104 and the depth of the adjacent resonance blind holes 102a is equal to 0.7-0.75 times of the total thickness of the product; similarly, the sum of the depth of the coupling blind slot 104 and the depth of the adjacent resonance blind hole 102b is equal to 0.7-0.75 times of the total thickness of the product.

Further, the shape of the non-metallization groove 105 is a closed ring structure, and the non-metallization groove 105 divides the conductive layer at the bottom of the coupling blind groove 104 to form a conductor capacitor flying bar 106.

Further, the electromagnetic signal is transmitted from the resonant blind hole 102a to the conductor capacitance flying rod 106 by means of capacitive coupling, and propagates on the conductor capacitance flying rod 106 to the bottom of the resonant blind hole 102b, and is coupled from the conductor capacitance flying rod 106 to the resonant blind hole 102 b.

Further, the shape and position of the conductor capacitive fly rod 106 is related to the strength of the negative coupling; by adjusting the shape, length and width of the conductor capacitance flying rod 106 and the relative distance and position between the conductor capacitance flying rod 106 and the resonant

blind holes

102a and 102b, the negative coupling strength between the resonant blind hole 102a and the resonant blind hole 102b can be adjusted.

Further, the size and location of the isolation via 107 is related to the strength of the negative coupling; the negative coupling strength between the resonant blind hole 102a and the resonant blind hole 102b can be adjusted by adjusting the size of the isolation through hole 107 or the position of the isolation through hole 107 relative to the coupling blind slot 104.

Further, the body 101 further includes a resonator isolation groove 109,

coupling ribs

108a and 108b are formed on the body 101, the adjacent resonant

blind holes

102a and 102d on the body 101 generate positive coupling through the coupling rib 108a, the positive coupling strength between the resonant

blind holes

102a and 102d can be controlled by controlling the shape and size of the coupling rib 108a, and the positive coupling strength can be corrected according to specific index requirements, which is not limited in this embodiment; similarly, the adjacent resonant

blind holes

102b and 102c on the body 101 generate positive coupling through the coupling rib 108b, the positive coupling strength between the resonant

blind holes

102b and 102c can be controlled by controlling the shape and size of the coupling rib 108b, and the correction can be performed according to specific index requirements, which is not limited in this embodiment.

The S-parameter curve of this embodiment is shown in fig. 5, the center frequency of the filter implemented in this embodiment is 3500MHz, the bandwidth is greater than 200MHz, and 2 zeros are generated at 3300MHz and 3700MHz by the conductor-capacitor flying bar 106, so that the filter achieves-40 dB out-of-band rejection at 3320MHz and 3680 MHz.

It should be noted that the

coupling ribs

108a and 108b, the resonant

blind holes

102c and 102d, and other elements in the present embodiment are elements constituting the specific embodiment, and simple reconfiguration of the positions, sizes, interrelations, etc. of these elements to meet different technical index requirements should be considered to be within the scope of the present invention.

Further, the solid dielectric material is preferably ceramic. The ceramic has high dielectric constant, hardness and high temperature resistance, so that the ceramic becomes a common solid dielectric material in the field of radio frequency filters. Of course, other materials known to those skilled in the art, such as glass, electrically insulating polymers, etc., may be used as the dielectric material.

Further, the conductive layer 103 is preferably silver. Silver is a high-conductivity material, and has the advantages of low loss, good weldability and the like. Of course, the conductive layer 103 may be made of other conductive metal materials such as copper and nickel that can meet the index requirements.

Further, the body 101 is formed by integral molding and high-temperature sintering.

Further, the conductive layer 103 is attached to the surface layer of the body 101 by spraying, dipping, printing or electroplating.

Further, the non-metallization groove 105 is formed by a laser etching technique.

In a second embodiment, referring to fig. 4, an isolation groove 207 is formed on the body 201 at the side of the coupling blind groove 204, and the surface of the isolation groove 207 is covered with the conductive layer 203; further, the size and location of the isolation trench 207 is related to the strength of the negative coupling; the strength of the negative coupling between the resonant blind via 202a and the resonant blind via 202b can be adjusted by adjusting the size of the isolation slot 207, or the position of the isolation slot 207 relative to the coupling blind via 204.

Further, the isolation trench 207 is integrally connected with the resonator isolation trench 209.

It should be noted that the second embodiment is different from the first embodiment only in the isolation trench 207, other features are the same as the first embodiment, and the same effect is achieved, and here, the second embodiment is only used for illustrating the shape difference of the negative coupling isolation structure, and the negative coupling isolation structure with the similar structure should be within the protection scope of this patent.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims

1. The utility model provides a dielectric filter who contains negative coupling structure, its characterized in that includes the body of being made by solid-state dielectric material, the body surface cladding has the conducting layer, the body is provided with 2 at least resonance blind holes, the body is lieing in the back of resonance blind hole is formed with the blind groove of coupling, the blind groove bottom of coupling is formed with non-metallization groove, the body in one side of the blind groove of coupling is formed with isolation through-hole or isolation tank, isolation through-hole or isolation tank internal surface cover have the conducting layer.

2. The dielectric filter including a negative coupling structure according to claim 1, wherein said coupling blind slot does not intersect said resonant blind hole.

3. The dielectric filter containing the negative coupling structure of claim 1, wherein the non-metalized groove is in a shape of a closed ring structure, and the non-metalized groove divides the conductive layer at the bottom of the coupling blind groove to form a conductor capacitor flying bar.

4. The dielectric filter including a negative coupling structure of claim 1, wherein the body further includes one or more resonator isolation grooves formed with a plurality of coupling ribs.

5. A dielectric filter comprising a negative coupling structure according to claim 1, wherein the solid dielectric material is ceramic.

6. The dielectric filter including a negative coupling structure of claim 1, wherein the conductive layer is made of silver or copper.

7. The dielectric filter including a negative coupling structure as claimed in claim 1, wherein the body is formed by integral molding and high-temperature sintering.

8. The dielectric filter including the negative coupling structure of claim 1, wherein the conductive layer is attached to the surface of the body by spraying, dipping, printing or electroplating.

9. The dielectric filter including a negative coupling structure of claim 1, wherein said non-metallized slots are formed using laser etching.