阅读说明：本技术 可实现单个带外传输零点的介质波导滤波器 (Dielectric waveguide filter capable of realizing single out-of-band transmission zero ) 是由 肖家斌 洪星 王斌华 叶荣 廖东 于 2019-11-19 设计创作，主要内容包括：本发明适用于介质滤波器技术领域,提供了一种可实现单个带外传输零点的介质波导滤波器,包括有滤波器主体、至少两个端口腔以及至少一个谐振腔,所述端口腔设于所述滤波器主体的主通路上,且所述谐振腔设于至少一个所述端口腔一侧的所述滤波器主体的非主通路上。借此,本发明可以不用普通介质波导滤波器使用交叉耦合的结构方式产生带外传输零点,同时也可以不使用产生容性耦合的结构方式,而产生一个单边带外的传输零点,具有结构简单、占用空间小且加工方便的优点。(The invention is applicable to the technical field of dielectric filters, and provides a dielectric waveguide filter capable of realizing a single out-of-band transmission zero point. Therefore, the invention can generate out-of-band transmission zero without using a cross coupling structural mode of a common dielectric waveguide filter, can generate a single-side out-of-band transmission zero without using a structural mode of generating capacitive coupling, and has the advantages of simple structure, small occupied space and convenient processing.)

1. A dielectric waveguide filter capable of realizing a single out-of-band transmission zero point is characterized by comprising a filter main body, at least two port cavities and at least one resonant cavity, wherein the port cavities are arranged on a main channel of the filter main body, and the resonant cavity is arranged on a non-main channel of the filter main body on one side of at least one port cavity.

2. The dielectric waveguide filter for achieving single out-of-band transmission zero according to claim 1, wherein at least one of the resonators comprises a vertical cavity with a top hole and/or a horizontal cavity with a side wall hole.

3. A dielectric waveguide filter according to claim 1 wherein at least one of the resonators comprises a cylindrical and/or rectangular and/or irregular structure.

4. The dielectric waveguide filter for achieving single out-of-band transmission zero according to claim 1, wherein a surface of the filter body is covered with a metallization layer.

5. A dielectric waveguide filter according to claim 1 wherein the dielectric material of the filter body is an electrically conductive material.

6. The dielectric waveguide filter of claim 5 wherein the dielectric material is a ceramic material.

7. The dielectric waveguide filter with out-of-band transmission zeroes of claim 1 wherein at least two of said port cavities comprise an input port cavity and an output port cavity, said resonator cavities being disposed in non-main paths on said filter body on one side of said input port cavity; or

The resonant cavity is arranged on a non-main channel on the filter main body at one side of the oral cavity of the output end.

Technical Field

The invention relates to the technical field of dielectric filters, in particular to a dielectric waveguide filter capable of realizing a single out-of-band transmission zero point.

Background

With the continuous development of modern communication technology, the performance index requirements of the filter are higher and higher. The dielectric waveguide filter has small size, high Q value, low cost and other features, and may be used in communication system with high miniaturization and integration level.

However, with the continuous development of multi-frequency systems, the requirements on the frequency selection characteristic and the out-of-band rejection characteristic of the filter are higher and higher; the introduction of the transmission zero is an important method for improving the frequency selection characteristic and the out-of-band rejection characteristic of the filter, and the traditional metal filter realizes the transmission zero by using a cross-coupling structure; for dielectric waveguide filters, the structure of the mode of introducing cross coupling requires a larger volume to realize.

As can be seen from the above, the conventional dielectric waveguide filter has many problems in practical use, and therefore, it is necessary to improve the conventional dielectric waveguide filter.

Disclosure of Invention

In view of the above-mentioned drawbacks, an object of the present invention is to provide a dielectric waveguide filter capable of implementing a single out-of-band transmission zero, which can generate an out-of-band transmission zero without using a cross-coupled structure of a common dielectric waveguide filter, and can generate a single out-of-band transmission zero without using a capacitive coupling structure, and has the advantages of simple structure, small occupied space, and convenient processing.

In order to achieve the above object, the present invention provides a dielectric waveguide filter capable of realizing a single out-of-band transmission zero, including a filter body, at least two port cavities and at least one resonant cavity, where the port cavities are disposed on a main channel of the filter body, and the resonant cavity is disposed on a non-main channel of the filter body on one side of at least one of the port cavities.

According to the dielectric waveguide filter capable of realizing the single out-of-band transmission zero point, at least one resonant cavity comprises a vertical cavity with a top hole and/or a horizontal cavity with a side wall hole.

According to the dielectric waveguide filter capable of realizing the single out-of-band transmission zero point, at least one resonant cavity comprises a cylindrical body and/or a rectangular body and/or an irregular body structure.

According to the dielectric waveguide filter capable of realizing the single out-of-band transmission zero point, the surface of the filter body is covered with the metalized coating.

According to the dielectric waveguide filter capable of realizing a single out-of-band transmission zero point, the dielectric material of the filter body is an electrically conductive material.

According to the dielectric waveguide filter capable of realizing the single out-of-band transmission zero point, the dielectric material is a ceramic material.

According to the dielectric waveguide filter capable of realizing the single out-of-band transmission zero point, at least two port cavities comprise an input end cavity and an output end cavity, and the resonant cavity is arranged on a non-main channel on the filter body on one side of the input end cavity; or

The resonant cavity is arranged on a non-main channel on the filter main body at one side of the oral cavity of the output end.

The dielectric waveguide filter capable of realizing a single out-of-band transmission zero point comprises a filter main body, at least one end oral cavity and at least one resonant cavity, wherein the end oral cavity is arranged on a main channel of the filter main body, and the resonant cavity is arranged on a non-main channel of the filter main body on one side of the end oral cavity. Therefore, the invention can generate out-of-band transmission zero without using a cross coupling structural mode of a common dielectric waveguide filter, can generate a single-side out-of-band transmission zero without using a structural mode of generating capacitive coupling, and has the advantages of simple structure, small occupied space and convenient processing.

Drawings

Fig. 1 is a structural sectional view of a dielectric waveguide filter capable of realizing a single out-of-band transmission zero according to a first embodiment of the present invention;

fig. 2 is a cross-sectional structural view of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a second embodiment of the present invention;

fig. 3 is a cross-sectional structural view of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a third embodiment of the present invention;

fig. 4 is a cross-sectional structural view of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a fourth embodiment of the present invention;

fig. 5 is a cross-sectional structural view of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a fifth embodiment of the present invention;

fig. 6 is a cross-sectional structural view of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a sixth embodiment of the present invention;

fig. 7 is a simulation diagram of a transmission zero on the left side of the passband of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero according to a first embodiment of the present invention;

fig. 8 is a simulation diagram of a dielectric waveguide filter capable of implementing a single out-of-band transmission zero to implement a transmission zero on the right side of a passband according to a third embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows a dielectric waveguide filter 100 capable of realizing a single out-of-band transmission zero point according to a first embodiment, which includes a filter body, at least two port cavities and at least one resonant cavity 12, wherein the port cavities are disposed on a main channel 13 of the filter body, and the resonant cavity 12 is disposed on a non-main channel of the filter body on at least one side of the port cavities. The at least two port cavities of this embodiment include an input port cavity 10 and an output port cavity 14, and this embodiment includes a resonant cavity 12, where the resonant cavity 12 is disposed on the non-main path on the filter body on one side of the input port cavity 10; referring to fig. 7, in the experimental simulation of the present embodiment, by arranging a resonant cavity 12 on a non-main path near the input end oral cavity 10, a transmission zero point on the left side of a pass band can be generated, the resonant frequency of the resonant cavity 12 generating the transmission zero point is close to the center frequency of the pass band, and the strength of the transmission zero point is related to the increased coupling amount between the resonant cavity 12 and the input end oral cavity 10; and the filter main body has simple structure, small occupied space and convenient processing. The added resonant cavity 12 needs to be able to generate a resonant frequency close to the passband of the entire filter and to generate an effective coupling with the port cavity; and the added resonator 12 has little coupling with the resonator element on the main path 13, only with the port cavity. As shown, a resonant cavity 12 is disposed on the non-main path near the mouth 10 of the input end to generate transmission zero, so as to improve out-of-band rejection, change the strength of transmission zero by changing the coupling between the first cavity and the added resonant cavity, and adjust the position of the pole by adjusting the frequency of the added resonant cavity. In other embodiments, the resonant cavity may be disposed on the non-main path on the filter body on the oral cavity side of the output end; that is, the cavity 12 is equally suitable for placement in a non-main path on the output end oral cavity 14 side.

At least one of the resonant cavities comprises a vertical cavity with a top hole and/or a horizontal cavity with a side wall hole. At least one resonant cavity comprises a cylindrical body and/or a rectangular body and/or an irregular body structure. In this embodiment, preferably, the resonant cavity 12 is a vertical cavity with a hole at the top, and the resonant cavity 12 has a cylindrical structure; other configurations that produce resonant frequencies and coupling are of course possible.

The surface of the filter main body is covered with a metalized plating layer. The dielectric material of the filter main body is an electric-conductive material; preferably, the dielectric material is a ceramic material. The filter body is also provided with a plurality of coupling windows 11 for adjusting the coupling.

Fig. 2 shows a dielectric waveguide filter 200 capable of realizing a single out-of-band transmission zero point according to a second embodiment, which includes a filter body, at least two port cavities disposed on a main path of the filter body, and at least one resonant cavity 15 disposed on a non-main path of the filter body on at least one side of the port cavity. The at least two port cavities of this embodiment include an input port cavity 10 and an output port cavity 14, and this embodiment includes a resonant cavity 15, where the resonant cavity 15 is disposed on the non-main path on the filter body on one side of the input port cavity 10; the difference from the above embodiment is that the resonant cavity 15 of the present embodiment is a horizontal cavity with a hole on the side wall; the input end oral cavity 10 and the output end oral cavity 14 are both vertically arranged cavity structures, the resonant cavity 15 is horizontally arranged, and the opening of the resonant cavity 15 is punched on the side wall of the filter main body; simulation experiments show that the added resonant cavity 15 of the present embodiment can also generate a transmission zero point on the left side of the pass band, and the added resonant cavity 15 has almost no coupling with the resonant unit on the main path and only couples with the port cavity. The cavity 15 is also adapted to be disposed in a non-main path on the side of the outlet port cavity 14.

Fig. 3 shows a dielectric waveguide filter 300 capable of realizing a single out-of-band transmission zero according to a third embodiment, which includes a filter body, at least two port cavities and at least one resonant cavity 16, wherein the port cavities are disposed on a main path of the filter body, and the resonant cavity 16 is disposed on a non-main path of the filter body on a side of at least one of the port cavities. The at least two port cavities of the present embodiment include an input port cavity 10 and an output port cavity 14; the difference from any of the above embodiments is that the present embodiment includes two resonant cavities 16, and both resonant cavities 16 are disposed on the non-main path at one side of the input end oral cavity 10, referring to fig. 8, and a transmission zero point at the right side of the pass band can be generated by disposing two resonant cavities 16 arranged in parallel; the resonant cavity 16 is a vertical cavity with a hole punched at the top, specifically, the resonant cavity 16 is formed by punching a hole at the top of the filter main body; the resonant cavity 16 is a cylindrical structure, but may be a rectangular structure or other irregular structures capable of generating resonant frequency and coupling. The two described cavities 16 are equally suitable for placement in the non-main path on the side of the output port mouth 14. A plurality of coupling windows 17 are also provided on the filter body for adjusting the coupling.

Of course, the dielectric waveguide filter for realizing the transmission zero form is not limited to the dielectric waveguide filter with one or two resonant cavities, and the dielectric waveguide filter with more than or equal to three resonant cavities can realize the function.

Fig. 4 shows a dielectric waveguide filter 400 capable of implementing a single out-of-band transmission zero according to a fourth embodiment, which includes a filter body, at least two port cavities disposed on a main path of the filter body, and at least one resonant cavity 18 disposed on a non-main path of the filter body on a side of at least one of the port cavities. The at least two port cavities of the present embodiment include an input port cavity 10 and an output port cavity 14; the cavity comprises two resonant cavities 18, and the two resonant cavities 18 which are arranged in parallel are arranged on a non-main passage at one side of the input end oral cavity 10; the difference between this embodiment and the third embodiment is that the two resonant cavities 18 of this embodiment are horizontal cavities with holes on their side walls; and the structure can also generate a transmission zero point on the right side of the pass band through a simulation experiment; the resonant cavity 18 is a cylindrical structure, but may also be a rectangular structure or other irregular structures capable of generating resonant frequency and coupling. The two described cavities 18 are equally suitable for placement in the non-main path on the side of the output port mouth 14.

Fig. 5 shows a dielectric waveguide filter 500 capable of realizing a single out-of-band transmission zero according to a fifth embodiment, which includes a filter body, at least two port cavities disposed on a main channel of the filter body, and at least one resonant cavity 19 disposed on a non-main channel of the filter body on at least one side of the mouth. The at least two port cavities of this embodiment include an input port cavity 10 and an output port cavity 14, and this embodiment includes a resonant cavity 19, where the resonant cavity 19 is disposed on the non-main path on the filter body on one side of the input port cavity 10; the difference between this embodiment and the first embodiment is that the resonant cavity 19 of this embodiment is a rectangular structure, and experimental simulation can also generate a transmission zero point on the left side of the pass band, and the additional resonant cavity 19 is hardly coupled with the resonant unit on the main channel, and is only coupled with the port cavity; the filter main body is simple in structure, small in occupied space and convenient to process. The cavity 19 is also adapted to be disposed in a non-main path on the side of the outlet port cavity 14.

Fig. 6 is a sixth embodiment of a dielectric waveguide filter 600 capable of implementing a single out-of-band transmission zero, which includes a filter body, at least two port cavities and at least one resonant cavity, where the port cavities are disposed on a main channel of the filter body, and the resonant cavity is disposed on a non-main channel of the filter body on a side of an oral cavity at least at one end. In this embodiment, the at least two port cavities include an input port cavity 10 and an output port cavity 14, and include two resonant cavities, which are a first resonant cavity 12 and a second resonant cavity 20, respectively, where the first resonant cavity 12 is disposed on a non-main path on one side of the input port cavity 10, and the second resonant cavity 20 is disposed on a non-main path on one side of the output port cavity 14, and this structure also generates a transmission zero point on the right side of a pass band according to the addition of the two resonant cavities, and the addition of the first resonant cavity 12 and the second resonant cavity 20 has almost no coupling with a resonant unit on the main path, and only couples with the port cavity; the filter main body is simple in structure, small in occupied space and convenient to process. The filter body is also provided with a plurality of coupling windows 11 for adjusting the coupling.

In summary, one or more resonant cavities are added around the non-main path of the port cavity to achieve the effect of generating the transmission zero, so as to improve out-of-band rejection, the strength of the transmission zero is changed by changing the coupling between the first cavity (i.e. the port cavity) and the added resonant cavity, and the position of the pole is adjusted by adjusting the frequency of the added resonant cavity. One resonant cavity can generate transmission zero outside the left side band, the two resonant cavities are arranged in parallel and can generate transmission zero outside the right side band, and the structure can generate transmission zero outside a single side band without using a common dielectric waveguide filter to generate a capacitive coupling structure. The mode for realizing the transmission zero point has the characteristics of simple structure, small occupied space and convenience in processing.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.