CN210468050U

CN210468050U - Dielectric filter coupling structure for realizing symmetrical transmission zero

Info

Publication number: CN210468050U
Application number: CN201921632316.7U
Authority: CN
Inventors: 何祥勇; 王一凡; 王平; 舒剑龙
Original assignee: Jiangxi Yichuang New Materials Co ltd
Current assignee: Jiangxi Yichuang New Materials Co ltd
Priority date: 2019-09-28
Filing date: 2019-09-28
Publication date: 2020-05-05
Anticipated expiration: 2029-09-28

Abstract

The utility model relates to a dielectric filter coupling structure for realizing symmetrical transmission zero, which comprises two staggered blind grooves, a through hole connecting the two blind grooves and a windowing part between two blind hole resonators; the two staggered blind grooves are respectively positioned above and below the dielectric block and are connected through a through hole, and the structure can realize phase reversal of a magnetic field, so that the coupling characteristic between the two blind hole resonators is changed from inductive to capacitive. The utility model discloses a coupling structure can be arranged in the dielectric filter to form the transmission zero point of symmetric distribution to improve the outband rejection ability of wave filter.

Description

Dielectric filter coupling structure for realizing symmetrical transmission zero

Technical Field

The utility model relates to a dielectric filter coupling structure for realizing symmetrical transmission zero belongs to the electronic components technical field among the communication field.

Background

The dielectric filter needs to introduce a capacitive cross coupling structure to realize the symmetrical transmission zero point, the capacitive coupling is realized by a deep blind hole with the depth exceeding that of the dielectric block 1/2 in the original scheme, and the scheme has the defects that harmonic waves are generated at the lower end of the filter passband, and the suppression capability of the filter is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a dielectric filter coupling structure for realizing symmetrical transmission zero, owing to be the short circuit structure of a intercommunication, can not produce the harmonic at the low side of wave filter passband, concrete scheme is as follows:

the utility model provides a dielectric filter coupling structure for realizing symmetrical transmission zero, including first blind hole syntonizer, the second blind hole syntonizer, be located the first blind groove of dielectric block below, be located the second blind groove of dielectric block top, through-hole and coupling window of connecting two dislocation blind grooves, wherein first blind hole syntonizer, the dielectric block is all squeezed into from the dielectric block top to the second blind hole syntonizer, first blind groove is squeezed into the dielectric block from the dielectric block below, first blind groove one end begins from the dielectric block center, the other end extends to first blind hole syntonizer position, the dielectric block is squeezed into from the dielectric block top to the second blind groove, second blind groove one end begins from the dielectric block center, the other end extends to second blind hole syntonizer position, the through-hole is located the dielectric block center, be used for connecting first blind groove and second blind groove.

Further, the first blind slot under the dielectric block may extend to a position right below the first blind hole resonator, or may not extend, and the coupling strength is determined by a minimum distance between an end of the first blind slot and the first blind hole resonator, and the smaller the distance, the stronger the coupling, and vice versa.

Further, the second blind slot above the dielectric block may be connected to the second blind hole resonator, or not connected, if not connected, the coupling strength is determined by the minimum distance between the end of the second blind slot and the second blind hole resonator, the smaller the distance, the stronger the coupling, and vice versa, and if connected, the coupling is strongest.

Furthermore, the two dislocated first blind grooves and the two dislocated second blind grooves are connected at the projection intersection through a through hole, the larger the diameter of the through hole is, the stronger the coupling is, and vice versa, the deeper the grooves of the two dislocated first blind grooves and the two dislocated second blind grooves are, the stronger the coupling is, and vice versa.

The utility model discloses the beneficial effect who gains is: the utility model discloses a phase place upset in magnetic field can be realized to coupling structure for coupling characteristic between two dielectric resonator becomes the capacity by the perception, and the utility model discloses a short circuit structure of a intercommunication can not produce extra resonance outside the wave filter passband, thereby improves the outband inhibition ability of wave filter.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view showing the structure of a dielectric filter in embodiment 1;

fig. 3 is a frequency response curve of a dielectric filter in example 1.

Detailed Description

As shown in fig. 1, a dielectric filter coupling structure with capacitive coupling characteristics includes a first blind via resonator 1, a second blind via resonator 2, a first blind via 3 located below a dielectric block, a second blind via 4 located above the dielectric block, a through hole 5 connecting two dislocated blind vias, and a coupling window 6, wherein first blind hole syntonizer 1, the dielectric block is all squeezed into from the dielectric block top to second blind hole syntonizer 2, first blind groove 3 is squeezed into the dielectric block from the dielectric block below, 3 one ends in first blind groove begin from the dielectric block center, the other end extends to first blind hole syntonizer 1 position, the dielectric block is squeezed into from the dielectric block top to second

blind groove

4, 4 one end in second blind groove begins from the dielectric block center, the other end extends to 2 positions in second blind hole syntonizers, through-hole 5 is located the dielectric block center for connect first blind groove 3 and second blind groove 4.

Example 1

Based on the above scheme, in one embodiment, as shown in fig. 2, the coupling structure is used in a 6-cavity dielectric filter, and two symmetrically distributed transmission zeros are generated, as shown in fig. 3, so that the out-of-band rejection characteristic of the dielectric filter is improved.

As shown in fig. 2, the dielectric filter includes 6 resonant

blind holes

7, 8, … …, 11, 12. The main coupling is formed by windowing between adjacent resonant holes, the windowing coupling is magnetic coupling, the larger the windowing, the stronger the magnetic coupling, the wider the bandwidth of the filter, and vice versa. By introducing the coupling structure 13 of the present invention between the

non-adjacent resonant holes

7 and 10, a

transmission zero

14, 15 can be generated on each side of the filter passband, as shown in fig. 3. The stronger the coupling generated by the coupling structure 13, the closer the two transmission zeros are to the filter passband and vice versa.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A dielectric filter coupling structure for realizing symmetrical transmission zero points is characterized by comprising a first blind hole resonator (1), a second blind hole resonator (2), a first blind groove (3) positioned below a dielectric block, a second blind groove (4) positioned above the dielectric block, a through hole (5) for connecting two staggered blind grooves and a coupling window (6), wherein the dielectric block is punched into the first blind hole resonator (1) and the second blind hole resonator (2) from the upper part of the dielectric block, the dielectric block is punched into the first blind groove (3) from the lower part of the dielectric block, one end of the first blind groove (3) starts from the center of the dielectric block, the other end extends to the position of the first blind hole resonator (1), the dielectric block is punched into the second blind groove (4) from the upper part of the dielectric block, one end of the second blind groove (4) starts from the center of the dielectric block, and the other end extends to the position of the second blind hole resonator (2), the through hole (5) is positioned in the center of the dielectric block and used for connecting the first blind groove (3) and the second blind groove (4).

2. The dielectric filter coupling structure for implementing a symmetrical transmission zero of claim 1, wherein: the first blind slot (3) positioned below the dielectric block can extend to the position right below the first blind hole resonator (1) or not extend, the coupling strength is determined by the minimum distance between the tail end of the first blind slot (3) and the first blind hole resonator (1), the coupling strength is higher when the distance is smaller, and vice versa.

3. The dielectric filter coupling structure for implementing a symmetrical transmission zero of claim 1, wherein: the second blind slot (4) positioned above the dielectric block can be connected with the second blind hole resonator (2) or not connected, if the second blind slot (4) is not connected, the coupling strength is determined by the minimum distance between the tail end of the second blind slot (4) and the second blind hole resonator (2), the coupling is stronger when the distance is smaller, and vice versa, and the coupling is strongest when the second blind slot (4) is connected.

4. The dielectric filter coupling structure for implementing a symmetrical transmission zero of claim 1, wherein: the two staggered first blind grooves (3) and the second blind grooves (4) are connected at the projection intersection through a through hole (5), and the larger the diameter of the through hole (5), the stronger the coupling is, and vice versa.

5. The dielectric filter coupling structure for implementing a symmetrical transmission zero of claim 1, wherein: the deeper the two first blind grooves (3) and the second blind grooves (4) are, the stronger the coupling is, and vice versa.

6. The dielectric filter coupling structure for implementing a symmetrical transmission zero of claim 1, wherein: the cross sections of the first blind groove (3) and the second blind groove (4) can be in a waist circle shape, an oval shape or other strip-shaped polygons, and the cross sections of the through holes (5) can be in a circle shape or a polygon shape.