CN219286625U

CN219286625U - High-frequency dielectric filter

Info

Publication number: CN219286625U
Application number: CN202223018169.9U
Authority: CN
Inventors: 苗青雷
Original assignee: Jiaxing Runjie Electronics Co ltd
Current assignee: Jiaxing Runjie Electronics Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-06-30
Anticipated expiration: 2032-11-14

Abstract

The utility model discloses a high-frequency dielectric filter, which comprises a PCB (printed circuit board), wherein an input end and an output end are arranged on two sides of the PCB; a plurality of first bonding pads are arranged on the PCB, capacitors are connected in series between the adjacent first bonding pads, and a grounded dielectric resonator is welded on each first bonding pad; the dielectric resonator is of a cuboid structure and is provided with four rectangular side surfaces and two square end surfaces, the interior of the dielectric resonator is hollow and is provided with silver coatings, silver coatings are arranged on four rectangular side surfaces among six outer side surfaces of the dielectric resonator, and the two square end surfaces are open ends. The utility model realizes high-frequency filtering by using the dielectric filter with 1/2 wavelength, and the capacitance value of the coupling capacitance between the dielectric resonators is increased under the 1/2 wavelength, so that the capacitance element with proper specification can be selected, and the size of the dielectric resonator is increased, thereby being realized by the prior art.

Description

High-frequency dielectric filter

Technical Field

The utility model relates to the technical field of filters, in particular to a high-frequency dielectric filter.

Background

The frequency of the filter made of the existing material is generally 0.5-6G. If the frequency is about 7-8G, a cavity filter is usually adopted, but the size of the cavity filter is bigger, and the application range is small.

If a dielectric filter is used to realize high-frequency filtering, the dielectric filter circuit is usually 1/4 wavelength, and when the frequency reaches 6G and the dielectric resonator is made of a dielectric constant 10 material, the height of the dielectric resonator is only 4mm. When the frequency of the actual filter is increased to 7-8G, the size of the dielectric resonator is smaller, the capacitance of the coupling capacitance between the dielectric resonators is smaller, and the process is difficult to realize.

Disclosure of Invention

In order to solve the above problems, the present utility model provides a high-frequency dielectric filter that employs a 1/2 wavelength dielectric filter circuit to achieve high-frequency filtering.

For this purpose, the technical scheme of the utility model is as follows: the high-frequency dielectric filter comprises a PCB, wherein an input end and an output end are arranged on two sides of the PCB; a plurality of first bonding pads are arranged on the PCB, capacitors are connected in series between the adjacent first bonding pads, and a grounded dielectric resonator is welded on each first bonding pad; the dielectric resonator is of a cuboid structure and is provided with four rectangular side surfaces and two square end surfaces, the interior of the dielectric resonator is hollow and is provided with silver coatings, silver coatings are arranged on four rectangular side surfaces among six outer side surfaces of the dielectric resonator, and the two square end surfaces are open ends.

Preferably, a pin is inserted into a hole on one end face of the dielectric resonator, the other end of the pin is welded on the first bonding pad, one side face of the dielectric resonator is welded on the grounding surface of the PCB, and four side faces of the dielectric resonator are grounded.

Preferably, an input capacitor is arranged between the input end and the first bonding pad on one side, and an output capacitor is arranged between the output end and the first bonding pad on the other side; and coupling capacitors are welded between the adjacent first bonding pads, and pins at two ends of the coupling capacitors are welded on the two adjacent first bonding pads in a distributed manner.

Preferably, an input capacitor C1 and an output capacitor C6 are arranged on the PCB, coupling capacitors C2, C3, C4 and C5 are connected in series between the input capacitor C1 and the output capacitor C6, the capacitance values of the input capacitor C1 and the output capacitor C6 are the same, the capacitance values of the coupling capacitors C2 and C5 are the same, and the capacitance values of the coupling capacitors C3 and C4 are the same; the PCB is provided with dielectric resonators F1, F2, F3, F4 and F5, the lengths of the dielectric resonators F1 and F5 are consistent, and the lengths of the dielectric resonators F2 and F4 are consistent.

Preferably, second bonding pads are arranged on two sides of the PCB and serve as an input end and an output end.

The length calculation formula of the 1/4 dielectric resonator is as follows:

wherein: epsilon ₀ Is a dielectric constant, f ₀ For frequency, L is the resonator length.

The dielectric resonator is a cuboid ceramic structure and comprises two square end faces and 4 rectangular side faces, wherein silver coatings are arranged in the square end faces, the rectangular side faces and the middle opening of the outer portion. Removing a silver coating on one square end surface of the dielectric resonator at 1/4 wavelength to form 1 open end;

the filter adopts 1/2 wavelength, and the silver coatings on the two square end surfaces of the dielectric resonator are removed to form 2 open ends. The same material, under the same length, the frequency of the 1/2 wavelength dielectric resonator is half of that of the 1/4 wavelength dielectric resonator. Therefore, the length of the 1/2 wavelength dielectric resonator can be doubled compared with the length of the 1/4 wavelength dielectric resonator under the same frequency, and the process operation of the high-frequency filter is convenient. A solution is finally obtained which can be reduced in size and replace part of the cavity filter.

Compared with the prior art, the utility model has the beneficial effects that: the high-frequency filtering is realized by using the dielectric filter with the wavelength of 1/2, the capacitance value of the coupling capacitance between the dielectric resonators is increased at the wavelength of 1/2, a capacitance element with proper specification can be selected, and meanwhile, the length of the dielectric resonator is increased, so that the operation is convenient by the existing process.

Drawings

The following is a further detailed description of embodiments of the utility model with reference to the drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a waveform diagram of the present utility model;

FIG. 3 is an equivalent circuit diagram of the present utility model;

fig. 4 is a schematic structural view of a dielectric resonator according to the present utility model.

Marked in the figure as: the Printed Circuit Board (PCB) 1, a dielectric resonator 2, a rectangular side surface 21, a square end surface 22, a dielectric resonator inner part 23, a silver coating 3, a first bonding pad 4 and a second bonding pad 5.

Detailed Description

In the description of the present utility model, it should be noted that, for the azimuth words such as the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, only for convenience of describing the present utility model and simplifying the description, but do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and should not be construed as limiting the specific protection scope of the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" feature may explicitly or implicitly include one or more of such feature, and in the description of the present utility model, the meaning of "a number", "a number" is two or more, unless otherwise specifically defined.

See the drawings. The high-frequency dielectric filter of the embodiment comprises a PCB 1, wherein second bonding pads 5 are welded on two sides of the PCB 1 and serve as an input end S1 and an output end S2. A plurality of first bonding pads 4 are arranged on the PCB board 1, and a plurality of capacitors are connected in series between the input end S1 and the output end S2 through the first bonding pads 4. The PCB board 1 is also provided with a plurality of dielectric resonators 2, each dielectric resonator 2 is of a cuboid structure and is provided with four rectangular side surfaces 21 and two square end surfaces 22, the inside 23 of each dielectric resonator is hollow and is provided with a silver coating 3, among six outer side surfaces of each dielectric resonator, only four rectangular side surfaces 21 are provided with silver coatings, and two square end surfaces 22 are provided with no silver coating and are open ends, so that 1/2 wavelength is obtained.

Pins are inserted into holes in one end face of the dielectric resonator 2, the other ends of the pins are welded on the first bonding pads 4, one side face of the dielectric resonator is welded on the grounding surface of the PCB, and four side faces of the dielectric resonator are grounded.

Specific:

an input capacitor C1 is arranged between the input end S1 and the first bonding pad on the side surface, an output capacitor C6 is arranged between the output end S2 and the first bonding pad on the other side surface, and the capacitance values of the input capacitor C1 and the output capacitor C6 are both 0.19pF; coupling capacitors C2, C3, C4 and C5 are connected in series between the input capacitor C1 and the output capacitor C6, and pins at two ends of the coupling capacitors are welded on two adjacent first bonding pads in a distributed mode. Wherein the capacitance of the coupling capacitors C2 and C5 is 0.06pF, and the capacitance of the coupling capacitors C3 and C4 is 0.04pF.

A dielectric resonator F1 is arranged between the input capacitor C1 and the coupling capacitor C2, a dielectric resonator F2 is arranged between the coupling capacitor C2 and the coupling capacitor C3, a dielectric resonator F3 is arranged between the coupling capacitor C3 and the coupling capacitor C4, a dielectric resonator F4 is arranged between the coupling capacitor C4 and the coupling capacitor C5, and a dielectric resonator F5 is arranged between the coupling capacitor C5 and the output capacitor C6. Wherein the length of dielectric resonators F1 and F5 is 6.346mm, the length of dielectric resonators F2 and F4 is 6.555mm, and the length of dielectric resonator F3 is 6.586mm.

The waveform diagram of this embodiment is shown in fig. 2, and the technical index parameters are as follows:

the above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. The high-frequency dielectric filter comprises a PCB, wherein an input end and an output end are arranged on two sides of the PCB; a plurality of first bonding pads are arranged on the PCB, capacitors are connected in series between the adjacent first bonding pads, and a grounded dielectric resonator is welded on each first bonding pad; the method is characterized in that: the dielectric resonator is of a cuboid structure and is provided with four rectangular side surfaces and two square end surfaces, the interior of the dielectric resonator is hollow and is provided with silver coatings, silver coatings are arranged on four rectangular side surfaces among six outer side surfaces of the dielectric resonator, and the two square end surfaces are open ends.

2. A high frequency dielectric filter as defined in claim 1, wherein: pins are inserted into holes in one end face of the dielectric resonator, the other ends of the pins are welded on the first bonding pads, one side face of the dielectric resonator is welded on the grounding surface of the PCB, and four side faces of the dielectric resonator are grounded.

3. A high frequency dielectric filter as defined in claim 1, wherein: an input capacitor is arranged between the input end and the first bonding pad on one side of the input end, and an output capacitor is arranged between the output end and the first bonding pad on the other side of the input end; and coupling capacitors are welded between the adjacent first bonding pads, and pins at two ends of the coupling capacitors are welded on the two adjacent first bonding pads in a distributed manner.

4. A high frequency dielectric filter as claimed in claim 3, wherein: the PCB is provided with an input capacitor C1 and an output capacitor C6, coupling capacitors C2, C3, C4 and C5 are connected in series between the input capacitor C1 and the output capacitor C6, the capacitance values of the input capacitor C1 and the output capacitor C6 are the same, the capacitance values of the coupling capacitors C2 and C5 are the same, and the capacitance values of the coupling capacitors C3 and C4 are the same; the PCB is provided with dielectric resonators F1, F2, F3, F4 and F5, the lengths of the dielectric resonators F1 and F5 are consistent, and the lengths of the dielectric resonators F2 and F4 are consistent.

5. A high frequency dielectric filter as defined in claim 1, wherein: and second bonding pads are arranged on two sides of the PCB and serve as an input end and an output end.