WO2018107633A1

WO2018107633A1 - High-performance band-stop filter and communications cavity device thereof

Info

Publication number: WO2018107633A1
Application number: PCT/CN2017/081171
Authority: WO
Inventors: 郭春波; 邸英杰; 谢振雄
Original assignee: 京信通信技术(广州)有限公司; 京信通信系统（中国）有限公司; 天津京信通信系统有限公司
Priority date: 2016-12-14
Filing date: 2017-04-20
Publication date: 2018-06-21
Also published as: AU2017375168A1; BR112019011886A2; AU2017375168B2; CN106602191A

Abstract

Provided in the present invention is a high-performance band-stop filter, comprising a cavity body and a cover plate covering the cavity body; the cavity body is provided with a longitudinal hollow cavity, two connection ports being formed in two ends of the hollow cavity in a longitudinal direction, a transmission wire used to realize an electrical connection between the two connection ports and a transmission wire cavity used to accommodate the transmission wire being provided in the hollow cavity, one side of the transmission wire cavity is provided with multiple resonant cavities arranged in sequence, each resonant cavity having provided therein a resonant post, each resonant post being provided with an accommodation hole accommodating a resonance-adjusting screw, the transmission wire having provided thereon impedance converter structures corresponding to the resonant posts and capacitively coupled to said resonant posts; resonance-adjusting screws corresponding to each resonant post are suspended on the cover plate, said resonance adjusting screws having non-contact connections to the resonant posts. The present high-performance band-stop filter can realize good results in narrow relative bandwidth, wide pass band and stop band bandwidth, high stop band suppression and low insertion loss. Also provided in the present invention is a communications cavity device including the present high-performance band-stop filter.

Description

High performance band stop filter and its communication cavity device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a high performance band rejection filter and a communication cavity device thereof.

Background technique

With the development of LTE communication technology, system expansion has become an important part of network construction. System expansion has increased the use of frequency band resources, but at the same time, the frequency band is becoming more and more crowded. In order to ensure sufficient isolation between systems during system expansion, there is a higher requirement for filter performance.

The existing filter can achieve a faster out-of-band drop and a higher out-of-band rejection. In the case where the interval between the pass band and the stop band is large and the stop band suppression is not high, a good isolation effect can be achieved. However, in the case where the passband and stopband intervals are small, the passband and stopband bandwidths are wide, and the stopband rejection is high, the existing filter cannot achieve good isolation.

Therefore, there is a need in the industry for a filter or filter path that can solve the above technical problems.

Summary of the invention

The object of the present invention is to provide a good isolation effect in the case where the gap between the pass band and the stop band is small, the pass band and the stop band have a wide bandwidth, and the stop band suppression degree is high, so as to ensure sufficient between systems. High-performance band-stop filter with isolation and its communication cavity device.

In order to achieve the above object, the present invention provides the following technical solutions:

In a first aspect, a high performance band stop filter is provided. The high performance band rejection filter comprises a cavity and a cover plate covered with the cavity; the cavity is provided with a longitudinal cavity, and a connection port is formed at each end of the cavity in the longitudinal direction, and the cavity is formed in the cavity a transmission line for realizing electrical connection between the two connection ports and a transmission line cavity for accommodating the transmission line;

One side of the transmission line cavity is provided with a plurality of resonant cavities arranged in sequence, and each of the resonant cavities is provided with a resonant column, and each of the resonant columns is provided with a receiving hole for receiving a tuning screw, Transmission line Corresponding to the resonant column, an impedance conversion structure capacitively coupled to the resonant column is disposed;

A tuning screw is suspended on the cover plate corresponding to each of the resonant columns, and the tuning screw is non-contactly connected to the resonant column.

Specifically, the transmission line is provided with a plurality of impedance transformation structures, and the plurality of impedance transformation structures are disposed in one-to-one correspondence with the plurality of resonance columns.

Preferably, the resonant column and the impedance conversion branch are sequentially disposed at equal intervals along the linear transmission line.

Specifically, the impedance conversion structure includes a high-impedance line electrically connected to the transmission line and a coupling disk connected to the high-impedance line, and an end surface of the coupling disk faces the resonance column.

Preferably, the coupling disk end face is circular or rectangular.

Specifically, the plurality of resonant cavities are formed by connecting a plurality of metal separators disposed in parallel with the cavity bottom plate and the side plates.

Preferably, the resonant cavity is a square cavity having the same length of the bottom side.

Specifically, the resonant column is non-contacted with the cover plate to form a capacitance therebetween.

Specifically, the resonant column is electrically connected to the bottom of the cavity.

Preferably, the transmission line is secured within the transmission line cavity by means of a media support.

In a second aspect, a communication cavity device is provided. The communication cavity device includes the high performance band rejection filter of the first aspect described above.

Compared with the prior art, the solution of the invention has the following advantages:

The high performance band rejection filter of the present invention has a plurality of resonant cavities arranged in sequence on one side of the transmission line cavity, and each of the resonant cavities is provided with a resonant column, and each of the resonant columns is Providing a receiving hole for accommodating the tuning screw, and providing an impedance conversion structure capacitively coupled to the resonant column corresponding to the resonant column on the transmission line, so that the performance of the band rejection filter can be greatly improved, and Effectively achieve a very narrow gap between the passband and the stopband, a wide bandpass and stopband bandwidth, high stopband rejection, and low insertion loss. In addition, the high-performance band-stop filter has a simple structure, a moderate size, and good consistency, which is advantageous for mass production and improved production efficiency.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of an embodiment of a high performance band rejection filter according to the present invention;

2 is a top plan view of the cavity of FIG. 1 showing the positional relationship of the impedance conversion structure and the resonant column.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

As shown in FIG. 1 , the present invention provides a high performance band rejection filter 100 capable of achieving a narrow gap between a pass band and a stop band, a wide pass band and a stop band bandwidth, and a stop band. Good performance with high suppression and small insertion loss of passband. In addition, since the high performance band rejection filter 100 has a simple structure, it is advantageous for mass production.

In addition, in conjunction with FIG. 2, the high performance band rejection filter 100 includes a cavity 2 and a cover plate 1 that is covered with the cavity 2; the cavity 2 is provided with a longitudinal cavity 21 and is in the cavity 21

Connection ports

51 and 52 are formed at both ends in the longitudinal direction, and a transmission line 3 for electrically connecting the two

connection ports

51 and 52 and a transmission line cavity 31 for accommodating the transmission line 3 are disposed in the cavity 21. The cover plate 1 is fixedly connected to the cavity 2 by screws 9 to form a sealed space for signal transmission.

One side of the transmission line cavity 31 is provided with a plurality of resonant cavities 7 arranged in sequence, and the plurality of resonant cavities 7 are defined by a plurality of parallelly disposed metal baffles 10 connected to the bottom plate and the side plates of the cavity 2. Preferably, the resonant cavity 7 is a square cavity having the same length of the bottom surface, so as to facilitate the discharge of the cavity, improve space utilization, and optimize the spatial layout. In addition, each of the resonant cavities 7 is provided with a resonant column 71. The resonant column 71 is of any cylindrical structure and each of the resonant columns 71 is provided with a receiving hole for receiving the tuning screw 6.

Correspondingly, the cover plate 1 is provided with a mounting hole through which the tuning screw 6 passes, the mounting hole is opened corresponding to each of the resonant columns 71, and the tuning screw 6 passes through the cover plate 1 Ann The mounting holes are suspended on each of the resonant columns 71 and can extend into the receiving holes of the resonant column 71. However, the tuning screw 6 and the resonant column 71 are always in a non-contact connection.

By adjusting the tuning screw 6, adjustment of the resonant frequency of the resonator formed by the resonant cavity 7 and the resonant column 71 is achieved, thereby controlling the resonant frequency of the resonator within the stopband band. In addition, the resonant column 71 is non-contacted with the cover plate 1 to form a capacitance therebetween, which is an equivalent capacitance of the resonator; the resonance electrically connected to the bottom of the cavity 2 Column 71 forms an inductance that is the equivalent inductance of the resonator.

An impedance conversion structure 4 capacitively coupled to the resonant column 71 is disposed on the transmission line 3 corresponding to the resonant column 71. The impedance conversion structure 4, the transmission line 3 having a half length between two adjacent ones of the impedance conversion structures 4 on the two sides of the impedance conversion structure 4, and the resonance column 71 capacitively coupled to the impedance conversion structure 4, And the resonant cavity 7 in which the resonant column 71 is located constitutes the basic unit of the high performance band rejection filter 100. The impedance conversion structure 4 in the high performance band rejection filter 100 contributes to the high performance filter 100 achieving good electrical characteristics while being simple in structure and easy to produce and layout.

Specifically, the transmission line 3 is provided with a plurality of impedance transformation structures 4, and the plurality of impedance transformation structures 4 are disposed in one-to-one correspondence with the plurality of resonance columns 71. At the same time, the length of the transmission line segment between the two adjacent impedance conversion structures 4 does not have to be constrained to one of the conventional 1/4 or 1/8 wavelengths, and the lengths may be different. Further, the distance between the resonant column 71 and the transmission line 3 and the structural size of the impedance conversion structure 4 may be different.

2, the impedance conversion structure 4 includes a high impedance line 41 electrically connected to the transmission line 3 and a coupling pad 42 connected to the high impedance line 41. The end faces of the coupling pads 42 are disposed in one-to-one correspondence with the sidewalls of the plurality of resonant columns 71, and are not in contact with the resonant columns 71 to form a coupling capacitance. The side surface of the resonant column 71 may be a flat surface or a curved surface, such as a square cylindrical surface or a cylindrical surface. The end surface of the coupling disk 42 may be adjusted according to the side surface of the resonant column 71.

Preferably, the side surface of the resonant column 71 is a flat surface. Correspondingly, the end surface of the coupling disk 42 is circular or rectangular, which helps to adjust the coupling according to the structure size inside the cavity 2 and/or the lateral size of the resonant column 71. The structural shape and size of the end face of the disk 42. The high-performance band rejection filter 100 in this embodiment is advantageous for improving the shape and size of the coupling disk 42 by elastically adjusting the shape and size of the coupling disk 42. The electrical performance of the high performance band rejection filter 100 facilitates the structural layout of the high performance band rejection filter 100 on the one hand.

In addition, the transmission line 3 is built in the transmission line cavity 31, and its two ends are directly connected to the inner conductors (not labeled) of the two

connection ports

51, 52, respectively, to realize signal transmission between the two

connection ports

51, 52. . Wherein, the shape of the cross section of the transmission line 3 may be any shape, and the cross-sectional shape and size of different axial positions may be different from each other, and may be adjusted according to actual needs and the shape at the

connection ports

51, 52.

Preferably, the high performance band stop filter 100 further includes a media support 8. The transmission line 3 is fixed in the transmission line cavity 31 by means of the medium support member 8, which ensures that the position of the transmission line 3 does not move, and the resonance column 71 corresponding to the impedance conversion structure 4 and the impedance transformation structure 4 is prevented from being disturbed. The magnitude of the capacitance formed between them affects the electrical performance of the high performance band rejection filter 100.

Under the premise of ensuring the electrical performance of the high performance band rejection filter 100, in order to achieve high utilization of space and convenience of venting, preferably, the resonant cavity 7 is a square cavity of equal length and width, obviously, When the resonant cavity 7 is a square cavity, its utilization of space is the highest. At the same time, the transmission line segments between two adjacent converted impedance structures 4 are laid in a straight line, and the length of the transmission line segment is equal to the length of the side of the resonant cavity 7 and the metal spacer 10 between the resonant cavity 7. The sum of the thicknesses. That is, the resonance column 71 and the impedance conversion structure 4 are sequentially disposed at equal intervals along the linear transmission line 3.

The high performance band rejection filter 100 described in the present invention greatly improves the performance of the corresponding band rejection filter by introducing a structure conversion structure 4 having a simple structure. The high performance band rejection filter 100 can achieve a passband loss of 0-1880MHz ≤0.5dB, and a technical specification of ≥60dB suppression of the 1920-2170MHz band.

It should be noted that some embodiments of the high performance band stop filter 100 described in this disclosure do not constitute a limitation on the manner in which the invention may be used. In addition to the case where the low-end band of the stop band has a pass band, the high-performance band rejection filter 100 can also implement a pass band at the high end of the stop band, and both the high and low ends of the stop band have Passband situation.

In addition, the present invention also provides a communication cavity device. The communication cavity device includes the high performance band rejection filter 100 described above.

The above is only a part of the embodiments of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A high-performance band-stop filter includes a cavity and a cover plate covered with the cavity; the cavity is provided with a longitudinal cavity, and a connection port is formed at each end of the cavity in the longitudinal direction, A transmission line for realizing electrical connection between two connection ports and a transmission line cavity for accommodating the transmission line are provided in the cavity, and are characterized in that:

One side of the transmission line cavity is provided with a plurality of resonant cavities arranged in sequence, and each of the resonant cavities is provided with a resonant column, and each of the resonant columns is provided with a receiving hole for receiving a tuning screw, Corresponding to the resonant column on the transmission line, an impedance conversion structure capacitively coupled to the resonant column is disposed;

A tuning screw is suspended on the cover plate corresponding to each of the resonant columns, and the tuning screw is non-contactly connected to the resonant column.
The high performance band rejection filter according to claim 1, wherein the transmission line is provided with a plurality of impedance transformation structures, and the plurality of impedance transformation structures are disposed in one-to-one correspondence with the plurality of resonance columns.
The high performance band rejection filter according to claim 1, wherein the resonance column and the impedance conversion branch are sequentially disposed at equal intervals along the linear transmission line.
The high performance band rejection filter according to any one of claims 1 to 3, wherein the impedance conversion structure includes a high impedance line electrically connected to the transmission line and a coupling to the high impedance line a disk, an end surface of the coupling disk facing the resonant column.
The high performance band rejection filter according to claim 4, wherein the coupling disk end face is circular or rectangular.
The high performance band rejection filter according to claim 1, wherein the plurality of resonant cavities are formed by a plurality of parallel metal separators connected to the cavity bottom plate and the side plates.
The high performance band rejection filter according to claim 6, wherein the resonant cavity is a square cavity having the same length of the bottom side.
The high performance band rejection filter of claim 1 wherein said resonant column is non-contacted with said cover to form a capacitance therebetween.
The high performance band rejection filter according to claim 1, wherein the resonant column is electrically connected to the bottom of the cavity.
The high performance band rejection filter of claim 1 wherein said transmission line is secured within said transmission line cavity by a dielectric support.
A communication cavity device comprising the high performance band rejection filter of any of claims 1-10.