AU2017375168B2 - High-performance band-stop filter and communications cavity device thereof - Google Patents
High-performance band-stop filter and communications cavity device thereof Download PDFInfo
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- AU2017375168B2 AU2017375168B2 AU2017375168A AU2017375168A AU2017375168B2 AU 2017375168 B2 AU2017375168 B2 AU 2017375168B2 AU 2017375168 A AU2017375168 A AU 2017375168A AU 2017375168 A AU2017375168 A AU 2017375168A AU 2017375168 B2 AU2017375168 B2 AU 2017375168B2
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- 238000004891 communication Methods 0.000 title claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 230000001629 suppression Effects 0.000 abstract description 8
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 230000004308 accommodation Effects 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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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
[0001] The present invention relates to the field of communications
technologies, and in particular to a high performance band-stop filter and a communication cavity device thereof.
[0002] With the development of LTE communication technology,
system expansion has become an important part of network construction.
System expansion enhances the use of frequency band resources, but at the same time, frequency bands are becoming more and more crowded. In order
to ensure sufficient isolation between systems during system expansion, higher requirements are placed on filter performance.
[0003] Prior art filters can achieve faster out-of-band degradation and
higher out-of-band suppression. A good isolation effect can be achieved in
case where an interval between a pass band and a stop band is large and stop band suppression is not high. However, in case where the interval 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 is high, the prior art filter cannot achieve good isolation.
[0004] Therefore, there is a need in the industry for a filter or filter path
that can solve the above technical problems.
[0005] The present invention is intended to provide a band-stop filter and its communication cavity device, which can achieve good isolation in
case where the interval 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 requirement is high.
[0006] In order to achieve the above object, the present invention provides the following technical solution.
[0007] In a first aspect, a high performance band-stop filter is provided.
The high performance band-stop filter includes a cavity and a cover plate mounted with the cavity. An elongated cavity is formed in the 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 the two connection ports and a transmission line chamber for accommodating the transmission line are provided in the cavity.
[0008] One side of the transmission line chamber is provided with a plurality of resonant cavities arranged in sequence, and each resonant cavity is provided with a resonant post. Each resonant post is provided with a
receiving hole for accommodating a tuning screw, and an impedance conversion structure capacitively coupled to a respective resonant post is
disposed on the transmission line at a location corresponding to said
resonant post.
[0009] A tuning screw is suspended on the cover plate at a location corresponding to a respective resonant post. The tuning screw is non-contactly connected to a corresponding resonant post.
[0010] Specifically, the transmission line is provided with a plurality of
impedance conversion structures, and the plurality of impedance conversion structures are respectively arranged in correspondence with respective ones
of the plurality of resonance posts.
[0011] Preferably, the resonant posts and the impedance conversion nodes are sequentially arranged along the linear transmission line in equally
spaced intervals.
[0012] 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. An end surface of the coupling
disk faces the resonant post.
[0013] Preferably, the end surface of the coupling disk is circular or
rectangular.
[0014] Specifically, the plurality of resonant cavities are formed by connecting a plurality of metal separation plates disposed in parallel with
each other, a bottom plate and side plates of the cavity.
[0015] Preferably, each resonant cavity is a square cavity having bottom sides of a same length.
[0016] Specifically, the resonant post does not contact with the cover plate to form a capacitance there-between.
[0017] Specifically, the resonant post is electrically connected to a
bottom of the cavity.
[0018] Preferably, the transmission line is secured within the transmission line chamber by means of a dielectric supporting member.
[0019] In a second aspect, a communication cavity device is provided.
The communication cavity device comprises the high performance band-stop
filter of the first aspect described above.
[0020] There is provided a high performance band-stop filter, comprising:
a cavity; and a cover plate mounted with the cavity; an elongated cavity being formed in the cavity, and two connection ports being formed respectively at two ends of the cavity in a longitudinal direction; a transmission line for realizing electrical connection between the two connection ports and a transmission line chamber for accommodating the transmission line being provided in the cavity; wherein one side of the transmission line chamber is provided with a plurality of resonant cavities arranged in sequence, and each resonant cavity is provided with a resonant post; each resonant post is provided with a receiving hole for accommodating a tuning screw; an impedance conversion structure capacitively coupled to a respective resonant post is disposed on the transmission line at a location corresponding to said resonant post; a tuning screw is suspended on the cover plate at a location corresponding to a respective resonant post; and the tuning screw is non-contactly connected to a corresponding resonant post, wherein 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 a corresponding resonant post.
[0021] Compared with the prior art, the solution of the invention has
the following advantages.
[0022] According to the high performance band-stop filter of the
present invention, one side of the transmission line chamber is provided with a plurality of resonant cavities arranged in sequence, and each resonant
cavity is provided with a resonant post. Each resonant post is provided with a receiving hole for accommodating a tuning screw. An impedance
conversion structure capacitively coupled to the resonant post is disposed on the transmission line at a location corresponding to the resonant post, so that
performance of the band-stop filter is greatly improved. It can effectively
achieve narrow gap between pass-band and stop-band, wide bandwidth of
pass-band and stop-band, high degree of stop-band suppression, and good insertion loss. In addition, the high-performance band-stop filter has simple
structure, a suitable size, and good consistency, which is advantageous for mass production and improved production efficiency.
[0023] Additional aspects and advantages of the invention will be set
forth in part in the description, which follows.
[0024] The above and/or additional aspects and advantages of the
present invention will become apparent and readily understood from the
description in connection with the drawings, wherein:
[0025] Figure 1 is a schematic structural view of an embodiment of a high performance band-stop filter according to the present invention; and
[0026] Figure 2 is a top plan view of the cavity of figure 1 showing the locational relationship of the impedance conversion structure and the resonant post.
[0027] 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.
[0028] As shown in figure 1, the present invention provides a high performance band-stop filter 100 capable of achieving a narrow gap between pass-band and stop-band, wide bandwidth of pass-band and stop-band, high degree of stop-band suppression, and good insertion loss. In addition, as the high performance band-stop filter 100 has simple structure, it is advantageous for mass production.
[0029] With reference to figure 2, the high performance band stop filter 100 includes a cavity 2 and a cover plate 1 assembled with the cavity 2. An elongated cavity 21 is formed in the cavity 2, and two connection ports 51, 52 are formed at two ends of the cavity respectively in a longitudinal direction. A transmission line 3 for realizing electrical connection between the two connection ports 51, 52 and a transmission line chamber 31 for accommodating the transmission line 3 are provided 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.
[0030] One side of the transmission line chamber 31 is provided with a plurality of resonant cavities 7 arranged in sequence. The plurality of
resonant cavities 7 are formed by connecting a plurality of metal separation
plates 10 disposed in parallel with each other, a bottom plate and side plates of the cavity 2. Preferably each resonant cavity 7 is a square cavity having bottom sides of a same length in order to better arrange them, improve space
utilization, optimize space layout. Further, each of the resonant cavities 7 is provided with a resonant post 71, which is of an arbitrary cylindrical
structure, and each of the resonant posts 71 is provided with a receiving hole
for accommodating a tuning screw 6 therein.
[0031] Correspondingly, the cover plate 1 is provided with a plurality
of mounting holes for a corresponding tuning screw 6 to pass through, and
each mounting hole is formed corresponding to a respective one of the resonant posts 71. The tuning screw 6 is suspended on a corresponding
resonant post 71 through a corresponding mounting hole on the cover plate 1
and can extend into the receiving hole of a corresponding resonant post 71. However, the tuning screw 6 and a corresponding resonant post 71 are
always in a non-contact connection.
[0032] The resonance frequency of a resonator defined by the cavity 7
and a corresponding resonance post 71 is adjusted by adjusting a
corresponding tuning screw 6, thereby limiting the resonance frequency of
the resonator in the frequency band of stop band. In addition, the resonant post 71 is non-contacted with the cover plate 1 to form a capacitance there-between, which is the equivalent capacitance of the corresponding resonator. The resonant post 71 electrically connected to the bottom of the cavity 2 forms an inductance, which is the equivalent inductance of the resonator. An impedance conversion structure 4 capacitively coupled to a respective resonant post 71 is disposed on the transmission line 3 at a location corresponding to said resonant post 71.
[0033] The impedance conversion structure 4, the transmission line 3 located halfway between two adjacent impedance conversion structures 4 on
both sides of the impedance conversion structure 4, and the resonance post 71 capacitively coupled to the impedance conversion structure 4 and the
resonant cavity 7 where the resonant post 71 is located together define a
basic unit of the high performance band-stop filter 100. The impedance conversion structure 4 in the high performance band stop filter 100
contributes to the high performance of the high performance filter 100, while
having a simple structure and being easy to produce and layout.
[0034] Specifically, the transmission line 3 is provided with a plurality
of impedance conversion structures 4, and the plurality of impedance
conversion structures 4 are disposed corresponding to the plurality of resonance posts 71. Meanwhile, the length of the transmission line between
the adjacent two impedance conversion structures 4 is not necessarily constrained to conventional 1/4 or 1/8 wavelength, and the length may be
different. In addition, the distance between the resonant post 71 and the
transmission line 3 may be different, and the structural size of the impedance
conversion structures 4 may be different.
[0035] Referring to figure 2, the impedance conversion structure 4 includes a high impedance line 41 electrically connected to the transmission line 3 and a coupling disk 42 connected to the high impedance line 41. An end surface of the coupling disk 42 faces a side wall of the resonant posts 71, and is not in a contact relationship with the resonant post 71 to form a coupling capacitor. A side surface of the resonant post 71 may be a plane or a curved surface, such as a square or a cylindrical surface. The end surface of the coupling disk 42 can be adjusted according to the side surface of the resonant post 71.
[0036] Preferably, the side surface of the resonant post 71 is a plane surface, and correspondingly, the end surface of the coupling disk 42 is circular or rectangular, thereby facilitating adjustment the shape and size of
the end face of the coupling disk 42 according to the structure and size inside the cavity 2 and/or the area of the side surface of the resonant post 71. In the
high performance band stop filter 100 of the present embodiment, by
elastically adjusting the shape and size of the coupling disk 42, on the one hand, it is advantageous to improve the electrical performance of the high
performance band stop filter 100, and on the other hand, it is advantageous
for the structural layout of the high performance band-stop filter 100.
[0037] In addition, the transmission line 3 is built in the transmission
line chamber 31, and two ends of the transmission line 3 are respectively connected with inner conductors (not labeled) of the two connection ports 51,
52 to realize signal transmission between the two connection ports 51, 52.
Here, the shape of the cross section of the transmission line 3 may be any
shape. The shapes and sizes of the cross sections at different axial locations may be different from each other, and may be adjusted according to actual needs and according to the shape at the connection ports 51, 52.
[0038] Preferably, the high performance band-stop filter 100 further includes a dielectric supporting member 8. The transmission line 3 is fixed in the transmission line chamber 31 by means of the dielectric supporting member 8, ensuring that the location of transmission line 3 does not move,
avoiding the influence on the capacitance formed between the impedance conversion structure 4 on it and the resonance post 71 corresponding to the impedance conversion structure 4, and avoiding influence on the electrical
performance of the high performance band stop filter 100.
[0039] In order to ensure the high utilization of space and convenience
of cavity arrangement, the resonant cavity 7 is preferably a square cavity of
equal length and width under the basis of ensuring the electrical performance of the high performance band stop filter 100. Obviously, when the resonant
cavity 7 is a square cavity, its utilization of space is the highest. At the same
time, the transmission line between two adjacent impedance conversion structures 4 is laid in a straight line. The length of the transmission line is
equal to the sum of the length of the side of the resonant cavity 7 and
thickness of the metal separation plate 10 between the two resonant cavities 7. That is to say, the resonant posts 71 and the impedance conversion
structures 4 are arranged in equally spaced intervals along the linear transmission line 3.
[0040] In the high performance band stop filter 100 described in the
present invention, the performance of the corresponding band-stop filter is
greatly improved using the impedance conversion structure 4 with simple structure. The high performance band stop filter 100 can achieve an insertion loss of <0.5 dB when the pass band is 0-1880 MHz, and a suppression of
60 dB for the stop band of the 1920-2170MHz.
[0041] It should be noted that some embodiments of the high performance band-stop filter 100 described in the present invention do not constitute a limitation on the use manner of the present invention. In addition
to the case where the low-end band of the stop band shown in the
embodiment has a pass band, the high-performance band stop filter 100 can also realize the case where the high-end band of the stop band also has a
pass band, and the high and low ends of the stop band both have a pass band.
[0042] In addition, the present invention also provides a communication cavity device. The communication cavity device includes the
above-described high performance band stop filter 100.
[0043] The above is only part of the embodiments of the present
invention, and it should be noted that those skilled in the art can also make
several improvements without departing from the principles of the present invention. It should be considered as the scope of protection of the present
invention.
Claims (10)
1. A high performance band-stop filter, comprising: a cavity; and a cover plate mounted with the cavity; an elongated cavity being formed in the cavity, and two connection ports being formed respectively at two ends of the cavity in a longitudinal direction; a transmission line for realizing electrical connection between the two connection ports and a transmission line chamber for accommodating the transmission line being provided in the cavity; wherein one side of the transmission line chamber is provided with a plurality of resonant cavities arranged in sequence, and each resonant cavity is provided with a resonant post; each resonant post is provided with a receiving hole for accommodating a tuning screw; an impedance conversion structure capacitively coupled to a respective resonant post is disposed on the transmission line at a location corresponding to said resonant post; a tuning screw is suspended on the cover plate at a location corresponding to a respective resonant post; and the tuning screw is non-contactly connected to a corresponding resonant post, wherein 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 a corresponding resonant post.
2. The high performance band-stop filter as recited in claim 1, wherein the transmission line is provided with a plurality of said impedance conversion structures, which are respectively arranged in correspondence with respective ones of the plurality of resonance posts.
3. The high performance band-stop filter as recited in claim 1, wherein the resonant posts and the impedance conversion structures are sequentially arranged along the linear transmission line in equally spaced intervals.
4. The high performance band-stop filter as recited in claim 1, wherein the end surface of the coupling disk is circular or rectangular.
5. The high performance band-stop filter as recited in claim 1, wherein the plurality of resonant cavities are formed by connecting a plurality of metal separation plates disposed in parallel with each other, a bottom plate and side plates of the cavity.
6. The high performance band-stop filter as recited in claim 5, wherein each resonant cavity is a square cavity having bottom sides of a same length.
7. The high performance band-stop filter as recited in claim 1, wherein the resonant post is non-contacted with the cover plate to form a capacitance there-between.
8. The high performance band-stop filter as recited in claim 1, wherein the resonant post is electrically connected to a bottom of the cavity.
9. The high performance band-stop filter as recited in claim 1, wherein the transmission line is secured within the transmission line chamber by a dielectric supporting member.
10. A communication cavity device comprising a high performance band-stop filter as recited in any one of claims 1-9.
1 / 1
9 6 1 21 8
10 3 52 4 7 2 71 51 100
Figure 1
31 41 8 7 42 51 52
21 10 71 100
Figure 2
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611153124.9 | 2016-12-14 | ||
| CN201611153124.9A CN106602191A (en) | 2016-12-14 | 2016-12-14 | High-performance band-stop filter and the communication cavity component thereof |
| PCT/CN2017/081171 WO2018107633A1 (en) | 2016-12-14 | 2017-04-20 | High-performance band-stop filter and communications cavity device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2017375168A1 AU2017375168A1 (en) | 2019-07-04 |
| AU2017375168B2 true AU2017375168B2 (en) | 2020-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2017375168A Active AU2017375168B2 (en) | 2016-12-14 | 2017-04-20 | High-performance band-stop filter and communications cavity device thereof |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN106602191A (en) |
| AU (1) | AU2017375168B2 (en) |
| WO (1) | WO2018107633A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879050B (en) * | 2018-07-23 | 2024-01-30 | 京信通信技术(广州)有限公司 | Band-stop filter and communication cavity device |
| CN109786907B (en) * | 2019-02-18 | 2020-05-19 | 摩比科技（深圳）有限公司 | Capacitive coupling structure of cavity filter and cavity filter |
| CN109713413B (en) * | 2019-02-25 | 2024-05-10 | 江苏贝孚德通讯科技股份有限公司 | Coupling structure of band-stop characteristic communication front-end equipment component |
| CN113131148A (en) * | 2019-12-31 | 2021-07-16 | 深圳市大富科技股份有限公司 | Communication device and filter thereof |
| CN212162041U (en) * | 2020-07-02 | 2020-12-15 | 罗森伯格技术有限公司 | Band-stop filter and radio frequency device |
| CN112635944B (en) * | 2020-12-30 | 2024-06-21 | 京信射频技术(广州)有限公司 | Filter and metal cavity filter |
| CN114284663A (en) * | 2022-02-10 | 2022-04-05 | 深圳国人科技股份有限公司 | 5G band elimination cavity filter |
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| KR101090725B1 (en) * | 2011-06-13 | 2011-12-08 | 주식회사 이너트론 | Dual band rejection filter |
| KR101115323B1 (en) * | 2011-06-13 | 2012-03-06 | 주식회사 이너트론 | Band rejection filter and band rejection filter circuit by the same |
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| CN201011666Y (en) * | 2006-12-28 | 2008-01-23 | 武汉凡谷电子技术股份有限公司 | Band stop filter |
| KR100992089B1 (en) * | 2009-03-16 | 2010-11-05 | 주식회사 케이엠더블유 | Band rejection filter |
| CN102354778B (en) * | 2011-08-24 | 2014-03-26 | 京信通信系统（中国）有限公司 | Elliptic function low-path filtering path and communication cavity device adopting same |
| CN103117436A (en) * | 2011-11-17 | 2013-05-22 | 成都赛纳赛德科技有限公司 | Miniaturization band elimination filter |
| CN102683779B (en) * | 2012-05-18 | 2014-09-10 | 京信通信系统（中国）有限公司 | Communication cavity device and elliptic function type high-pass filtering channel thereof |
| KR101386941B1 (en) * | 2012-10-10 | 2014-04-18 | 주식회사 이너트론 | Band rejection filter of assembly type |
| CN203300776U (en) * | 2013-05-06 | 2013-11-20 | 京信通信技术(广州)有限公司 | Communication cavity device and low-pass filtering path |
| CN104241751B (en) * | 2014-09-10 | 2017-07-25 | 江苏贝孚德通讯科技股份有限公司 | A kind of dielectric filter port coupled structure |
| CN206282952U (en) * | 2016-12-14 | 2017-06-27 | 京信通信技术(广州)有限公司 | High-performance bandstop filter and its communication cavity device |
-
2016
- 2016-12-14 CN CN201611153124.9A patent/CN106602191A/en active Pending
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2017
- 2017-04-20 AU AU2017375168A patent/AU2017375168B2/en active Active
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101090725B1 (en) * | 2011-06-13 | 2011-12-08 | 주식회사 이너트론 | Dual band rejection filter |
| KR101115323B1 (en) * | 2011-06-13 | 2012-03-06 | 주식회사 이너트론 | Band rejection filter and band rejection filter circuit by the same |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2017375168A1 (en) | 2019-07-04 |
| WO2018107633A1 (en) | 2018-06-21 |
| CN106602191A (en) | 2017-04-26 |
| BR112019011886A2 (en) | 2019-10-22 |
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