CN210468051U

CN210468051U - Cross coupling structure for adjusting transmission zero symmetry

Info

Publication number: CN210468051U
Application number: CN201921642949.6U
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: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-05-05
Anticipated expiration: 2029-09-29

Abstract

The utility model relates to a cross coupling structure for adjusting transmission zero symmetry, this structure are a blind groove for realize the coupling between two non-adjacent blind hole syntonizers, this blind groove can be connected with arbitrary one or two in two non-adjacent blind hole syntonizers, also can not throw out of gear and form independent blind groove. After the blind slot is added, the symmetry of transmission zero points at two ends of the passband can be adjusted, the longer the blind slot is, the transmission zero point at the lower end of the passband is closer to the passband than the transmission zero point at the high end of the passband, otherwise, the two transmission zero points tend to be more symmetrical.

Description

Cross coupling structure for adjusting transmission zero symmetry

Technical Field

The utility model relates to a cross coupling structure for adjusting transmission zero symmetry belongs to the electronic components technical field among the communication field.

Background

In recent years, with increasing demands for high performance and miniaturization of communication devices, dielectric filters have been receiving increasing attention. However, in the prior dielectric filter coupling structure with symmetrical zero point characteristics, the formed symmetrical zero point arrangement characteristics are fixed, that is, the zero point at the high end of the pass band of the filter is always closer to the pass band than the zero point at the low end.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cross coupling structure for adjusting transmission zero point symmetry can change symmetry at symmetry zero point, realizes promptly that the zero point of ripples pass band low side compares with high-end zero point and is closer to the pass band, and concrete scheme is as follows:

a cross coupling structure for adjusting transmission zero symmetry comprises a first blind hole resonator, a second blind hole resonator, a third blind hole resonator, a fourth blind hole resonator, a coupling window between the first blind hole resonator and the second blind hole resonator, a coupling hole between the second blind hole resonator and the third blind hole resonator, a coupling window between the third blind hole resonator and the fourth blind hole resonator, a coupling window between the first blind hole resonator and the fourth blind hole resonator, and a coupling blind slot between the first blind hole resonator and the third blind hole resonator.

Further, the coupling formed by the coupling window between the first and second blind-hole resonators is inductive coupling, the coupling formed by the coupling hole between the second and third blind-hole resonators is capacitive coupling, the coupling formed by the coupling window between the third and fourth blind-hole resonators is inductive coupling, the coupling window between the first and fourth blind-hole resonators is inductive coupling, and the coupling blind slot between the first and third blind-hole resonators is inductive coupling.

Furthermore, the coupling quantity formed by the straight blind slot for adjusting the symmetry of the transmission zero point is related to the length, the depth and the width of the blind slot, and the longer the length is, the greater the coupling quantity is, and vice versa; the deeper the depth, the greater the amount of coupling and vice versa; the wider the width, the greater the amount of coupling and vice versa. The greater the coupling amount is, the transmission zero point at the low end of the passband is closer to the passband than the transmission zero point at the high end of the passband, otherwise, the two transmission zero points tend to be more symmetrical.

The utility model discloses the beneficial effect who gains is: the utility model discloses an introduce the blind groove of a style of calligraphy and realize the cross coupling between the nonadjacent syntonizer, make arranging of symmetry zero point can be more nimble, can realize that the transmission zero point that is located the passband low side is more located the transmission zero point of passband high-end, is closer to the passband to improve dielectric filter's design flexibility.

Drawings

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

FIG. 2 is a schematic structural view of a dielectric filter body in embodiment 1;

FIG. 3 is an equivalent circuit diagram of a dielectric filter body in embodiment 1;

fig. 4 is a frequency response curve of the dielectric filter body in example 1.

Detailed Description

As shown in fig. 1, the cross-coupling structure for adjusting symmetry of transmission zeros is a straight blind slot, where the blind slot can adjust symmetry of transmission zeros at two ends of a pass band, and the longer the blind slot is, the transmission zero at the lower end of the pass band is closer to the pass band than the transmission zero at the higher end of the pass band, otherwise, the two transmission zeros tend to be more symmetric.

Example 1

On the basis of the scheme, in one embodiment, the cross-coupling structure is used for an 8-order dielectric filter, and adjustment of transmission zero point symmetry is achieved.

As shown in fig. 2, the 8 th-order dielectric filter is composed of 8

blind hole resonators

10 and 11 … … 17 and

coupling structures

18 and 19 … … 28 therebetween. With reference to the equivalent circuit shown in fig. 3, the

blind hole resonators

10 and 11 … … 17 correspond to the

resonant units

1 and 2 … … 8 in the equivalent circuit, wherein the coupling window 18 between the

blind hole resonators

10 and 11 corresponds to the inductive coupling between the

resonant units

1 and 2 in the equivalent circuit, and similarly, the

coupling windows

20, 21, 22, 24, 25, and 28 are all inductive coupling, and the

coupling holes

19 and 23 are capacitive coupling.

The first 4

resonator elements

1, 2, 3, 4 as shown in fig. 3 form two

transmission zeroes

29, 30 symmetrical as shown in fig. 4; the last 4

resonator elements

5, 6, 7, 8 form two

transmission zeroes

31, 32 which are symmetrical as shown in fig. 4. Add in preceding 4 resonance unit 26 after, combine figure 4 to show, two transmission zero points 29 of symmetry, 30's symmetry has obtained obvious regulation, the transmission zero point 29 of passband low side is closer to the passband than the transmission zero point 30 of passband high end. Since the cross-coupling structure is not added in the last 4 resonance units, the

transmission zeros

31 and 32 formed by the resonance units tend to be symmetrical.

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 cross-coupling structure for adjusting transmission zero symmetry, characterized in that: the medium body comprises a first blind-hole resonator, a second blind-hole resonator, a third blind-hole resonator and a fourth blind-hole resonator, wherein the four blind-hole resonators are arranged in a matrix manner in the clockwise direction and are symmetrically distributed along two sides of the axis of the medium body; a coupling window or a coupling hole is arranged between any two adjacent blind hole resonators, a coupling blind groove is arranged between two non-adjacent blind hole resonators, the coupling blind groove is in a straight line shape, and the length direction of the coupling blind groove is consistent with the connecting direction of the two non-adjacent blind hole resonators.

2. The cross-coupling structure for adjusting symmetry of transmission zeroes of claim 1, wherein: the coupling blind slots adjust the symmetry of transmission zero points at two ends of the passband, the longer the blind slots are, the transmission zero point at the lower end of the passband is closer to the passband than the transmission zero point at the higher end of the passband, otherwise, the two transmission zero points tend to be more symmetrical.

3. The cross-coupling structure for adjusting symmetry of transmission zeroes of claim 1, wherein: the coupling blind slot is connected with the first blind hole resonator and extends to the third blind hole resonator, or is connected with the third blind hole resonator and extends to the first blind hole resonator, or is simultaneously connected with the first blind hole resonator and the third blind hole resonator, or is not connected with the first blind hole resonator and the third blind hole resonator to form an independent blind slot.

4. The cross-coupling structure for adjusting symmetry of transmission zeroes of claim 1, wherein: the coupling blind slot is positioned between the first blind hole resonator and the third blind hole resonator or between the second blind hole resonator and the fourth blind hole resonator.

5. The cross-coupling structure for adjusting symmetry of transmission zeroes of claim 1, wherein: the coupling amount formed by the coupling blind slot is related to the length, the depth and the width of the blind slot, and the longer the length is, the larger the coupling amount is, and vice versa; the deeper the depth, the greater the amount of coupling and vice versa; the wider the width, the greater the amount of coupling and vice versa.