CN218941065U

CN218941065U - Dual-channel filter

Info

Publication number: CN218941065U
Application number: CN202222829614.3U
Authority: CN
Inventors: 苗青雷
Original assignee: Jiaxing Runjie Electronics Co ltd
Current assignee: Jiaxing Runjie Electronics Co ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-04-28
Anticipated expiration: 2032-10-26

Abstract

The utility model discloses a dual-channel filter, which comprises an input end and an output end, wherein an LC filter circuit and a dielectric filter circuit which are arranged in parallel are arranged between the input end and the output end, and the LC filter circuit and the dielectric filter circuit are input at the same end and output at the same end; the frequency of the LC filter circuit is 600MHz, and the frequency of the medium filter circuit is 1200MHz. The low-frequency band adopts the LC filter circuit, the high-frequency band adopts the medium filter circuit, so that the dual-channel filtering effect can be realized, the whole size of the filter cannot be enlarged, and the performance and the applicability of the filter are ensured.

Description

Dual-channel filter

Technical Field

The utility model relates to the technical field of filters, in particular to a dual-channel filter.

Background

A bandpass filter is a device that allows waves of a particular frequency band to pass while shielding other frequency bands, while a two-channel filter allows waves of two particular frequency bands to pass while shielding other frequency bands. Conventional dual-channel filters are implemented with a single LC filter circuit or a single dielectric filter circuit, but this creates a number of problems, such as 600MHz and 1200MHz for dual-channel frequencies, respectively, and when implemented with a single LC filter circuit, the LC filter band at frequency 1200MHz is narrow and not suitable. When implemented with a single dielectric filter circuit, the dielectric resonator is large in size and limited in size within the filter, which increases the overall size of the filter.

Disclosure of Invention

In order to solve the problems, the utility model provides a dual-channel filter, which integrates an LC filter circuit and a dielectric filter circuit and meets the filtering requirement of dual-channel wave bands.

For this purpose, the technical scheme of the utility model is as follows: a dual-channel filter comprises an input end and an output end, wherein an LC filter circuit and a dielectric filter circuit which are arranged in parallel are arranged between the input end and the output end, and the LC filter circuit and the dielectric filter circuit are input at the same end and output at the same end; the frequency of the LC filter circuit is 600MHz, and the frequency of the medium filter circuit is 1200MHz.

Preferably, a main circuit inductor and a main circuit capacitor which are alternately arranged are arranged on a main circuit of the LC filter circuit, the main circuit inductor and the main circuit capacitor are mutually connected in series, and a plurality of capacitors to ground are connected on the main circuit.

Preferably, in the LC filter circuit, a main circuit inductor L1, a main circuit capacitor C1, a main circuit inductor L2, a main circuit capacitor C2 and a main circuit inductor L3 are connected in series on a main circuit between an input end and an output end, a ground capacitor C3 is arranged between the input end and the main circuit inductor L1, and a ground capacitor C4 is arranged between the main circuit inductor L1 and the main circuit capacitor C1; a bypass inductor L4 is connected between the main circuit capacitor C1 and the main circuit inductor L2, and the bypass inductor L4 and the capacitor C5 to ground; a bypass inductor L5 is connected between the main circuit inductor L2 and the main circuit capacitor C2, and the bypass inductor L5 and the capacitor C6 to ground; and a bypass capacitor C7 is connected between the main circuit capacitor C2 and the main circuit inductor L3, and a grounding capacitor C8 is arranged between the main circuit inductor L3 and the output end.

Preferably, the dielectric filter circuit comprises a plurality of dielectric resonators which are arranged in parallel, an input capacitor is arranged between each dielectric resonator and the input end, an output capacitor is arranged between each dielectric resonator and the output end, and a coupling capacitor is arranged between each adjacent dielectric resonator.

Preferably, the dielectric filter circuit includes a dielectric resonator F11, a dielectric resonator F12, and a dielectric resonator F13 that are arranged in parallel, an input capacitor C11 is disposed between the dielectric resonator F11 and the input terminal, a coupling capacitor C12 is disposed between the dielectric resonator F11 and the dielectric resonator F12, a coupling capacitor C13 is disposed between the dielectric resonator F12 and the dielectric resonator F13, and an output capacitor C14 is disposed between the dielectric resonator F13 and the output terminal.

Compared with the prior art, the utility model has the beneficial effects that: the LC filter circuit is adopted in the low-frequency band, and the dielectric filter circuit is adopted in the high-frequency band, so that the dual-channel filter effect can be realized, the whole size of the filter cannot be enlarged, and the performance and the applicability of the filter are ensured.

Drawings

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

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

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

fig. 3 is a waveform diagram of the present utility model.

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 dual-channel filter comprises a shell, wherein insulators are welded in two side holes of the shell to serve as an input end S1 and an output end S2, an LC filter circuit and a dielectric filter circuit which are arranged in parallel are arranged between the input end S1 and the output end S2, and the LC filter circuit and the dielectric filter circuit are input at the same end and output at the same end.

The frequency of the LC filter circuit is 600MHz, a main circuit inductor L1, a main circuit capacitor C1, a main circuit inductor L2, a main circuit capacitor C2 and a main circuit inductor L3 are connected in series on a main circuit between an input end and an output end, a grounding capacitor C3 is arranged between the input end and the main circuit inductor L1, and a grounding capacitor C4 is arranged between the main circuit inductor L1 and the main circuit capacitor C1; a bypass inductor L4 is connected between the main circuit capacitor C1 and the main circuit inductor L2, and the bypass inductor L4 and the capacitor C5 to ground; a bypass inductor L5 is connected between the main circuit inductor L2 and the main circuit capacitor C2, and the bypass inductor L5 and the capacitor C6 to ground; and a bypass capacitor C7 is connected between the main circuit capacitor C2 and the main circuit inductor L3, and a grounding capacitor C8 is arranged between the main circuit inductor L3 and the output end.

The inductance value of the main inductance L1 and the main inductance L3 is 11nh, the inductance value of the main inductance L2 is 53nh, the capacitance value of the main inductance C1 and the main inductance C2 is 2.47pF, the inductance value of the bypass inductance L4 and the bypass inductance L5 is 7nh, the capacitance value of the capacitance to ground C3 and the capacitance to ground C8 is 6.5pF, the capacitance value of the capacitance to ground C4 and the capacitance to ground C7 is 8.7pF, and the capacitance value of the capacitance to ground C5 and the capacitance to ground C6 is 9.1pF.

The frequency of the dielectric filter circuit is 1200MHz. The dielectric filter circuit comprises a dielectric resonator F11, a dielectric resonator F12 and a dielectric resonator F13 which are arranged in parallel, wherein an input capacitor C11 is arranged between the dielectric resonator F11 and an input end, a coupling capacitor C12 is arranged between the dielectric resonator F11 and the dielectric resonator F12, a coupling capacitor C13 is arranged between the dielectric resonator F12 and the dielectric resonator F13, and an output capacitor C14 is arranged between the dielectric resonator F13 and an output end. The frequency of dielectric resonator F11 and dielectric resonator F13 was 1215MHz, and the frequency of dielectric resonator F12 was 1180MHz.

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. A dual-channel filter comprising an input and an output, characterized in that: an LC filter circuit and a dielectric filter circuit which are arranged in parallel are arranged between the input end and the output end, and the LC filter circuit and the dielectric filter circuit are input at the same end and output at the same end; the frequency of the LC filter circuit is 600MHz, and the frequency of the medium filter circuit is 1200MHz.

2. A dual channel filter as claimed in claim 1, wherein: main circuit inductance and main circuit capacitance which are alternately arranged are arranged on a main circuit of the LC filter circuit, the main circuit inductance and the main circuit capacitance are mutually connected in series, and a plurality of capacitors to ground are connected on the main circuit.

3. A dual channel filter as claimed in claim 2, wherein: in the LC filter circuit, a main circuit inductor L1, a main circuit capacitor C1, a main circuit inductor L2, a main circuit capacitor C2 and a main circuit inductor L3 are connected in series on a main circuit between an input end and an output end, a ground capacitor C3 is arranged between the input end and the main circuit inductor L1, and a ground capacitor C4 is arranged between the main circuit inductor L1 and the main circuit capacitor C1; a bypass inductor L4 is connected between the main circuit capacitor C1 and the main circuit inductor L2, and the bypass inductor L4 and the capacitor C5 to ground; a bypass inductor L5 is connected between the main circuit inductor L2 and the main circuit capacitor C2, and the bypass inductor L5 and the capacitor C6 to ground; and a bypass capacitor C7 is connected between the main circuit capacitor C2 and the main circuit inductor L3, and a grounding capacitor C8 is arranged between the main circuit inductor L3 and the output end.

4. A dual channel filter as claimed in claim 1, wherein: the dielectric filter circuit comprises a plurality of dielectric resonators which are arranged in parallel, an input capacitor is arranged between each dielectric resonator and an input end, an output capacitor is arranged between each dielectric resonator and an output end, and a coupling capacitor is arranged between each adjacent dielectric resonator.

5. The dual channel filter of claim 4, wherein: the dielectric filter circuit comprises a dielectric resonator F11, a dielectric resonator F12 and a dielectric resonator F13 which are arranged in parallel, wherein an input capacitor C11 is arranged between the dielectric resonator F11 and an input end, a coupling capacitor C12 is arranged between the dielectric resonator F11 and the dielectric resonator F12, a coupling capacitor C13 is arranged between the dielectric resonator F12 and the dielectric resonator F13, and an output capacitor C14 is arranged between the dielectric resonator F13 and an output end.