CN105789791B - A kind of adjustable cavity body filter of a wide range of frequency band - Google Patents
A kind of adjustable cavity body filter of a wide range of frequency band Download PDFInfo
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- CN105789791B CN105789791B CN201610140998.4A CN201610140998A CN105789791B CN 105789791 B CN105789791 B CN 105789791B CN 201610140998 A CN201610140998 A CN 201610140998A CN 105789791 B CN105789791 B CN 105789791B
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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
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Abstract
The invention discloses a kind of a wide range of adjustable cavity body filters of frequency band, comprising: input port and output port are respectively positioned on the same side of cuboid resonant cavity；Two rectangular windows are located at the center of resonant cavity；Two cuboid resonant rods are located at the symmetrical two sides of rectangular window；Two pairs of resonance disks are located above two cuboid resonant rods, and underlying two resonance disks are connect with two cuboid resonant rods respectively；Two cylindrical body tuning screws are connect with two resonance disks of top respectively.Rotation tuning screw rod can change the corresponding area of two pairs of resonance disks, adjustable for realizing the frequency band of cavity body filter.The adjustable cavity body filter structure of a wide range of frequency band of the invention is simple, and wider bandwidth, lesser insertion loss can be reached in passband, and biggish return loss reaches the adjustable effect of a wide range of frequency band, has good promotion prospect.
Description
Technical field
The present invention relates to a kind of a wide range of adjustable cavity body filters of frequency band, and specifically, being related to one kind can be applied to need
Otherwise with the wireless communication system of frequency band filter, belong to the technical field of microwave transmission device.
Background technique
Filter is a kind of frequency selectivity device, and effect is the useful signal of extracting and developing, while inhibiting not needing
Signal, the quality of its performance affects the communication quality of whole system.
Filter as one of Primary Component indispensable in communication transceiver, determine to a certain extent by size
The overall volume of radio-frequency front-end is determined, multi-frequency Characteristic can have been realized using single filter, then will greatly reduce transceiver entirety
Volume, to effectively reduce equipment cost.Currently, most popular filter is with micro-strip in radio frequency and microwave circuit
Structure is the planar structure filter of Typical Representative, and microstrip filter is with operating frequency range is extensive, size is small, price is low
It is honest and clean, easy to process by photoetching technique, be easy to other planar circuit process compatibles, be suitable for the advantages that producing in enormous quantities, but its product
Quality factor is lower.In order to meet different application environments, there is different filter constructions, cavity body filter is numerous filtering
One of device, cavity body filter have it is firm in structure, working frequency range is high, loss is low, power with higher and quality factor,
It can connect the feed equipment in radiating guide, be easily worked, be widely used in radar, electronic warfare, automatic measuring equipment.
For now, there are the cavity body filter of different structure, such as document " Tunable VHF Miniaturized
Helical Filter " in, a kind of cavity body filter based on helical structure is proposed, passband is between 257-365MHz
Variation, relative bandwidth is about 6%-7.7%, and structure is complicated for this helical structure, and manufacture difficulty is big, and adjustable extent is smaller.For another example
Document " A Constant-Q Tunable Combline Bandpass Filter using Angular Tuning
Technique " in, using can conditioning technology, it is big to produce an adjustable extent, the stable cavity body filter of quality factor, filtering
The tunable center frequency of device is 3.6GHz, adjustable extent 11.9%, but the relative bandwidth of filter only has 1%.Document
《Novel Dual-Band Microwave Filter Using Dual-Capacitively-Loaded Cavity
Resonator " in, a kind of cavity body filter of double frequency is proposed, but its frequency band is non-adjustable.
Simple it is therefore desirable to provide a kind of structure, insertion loss is small, and isolation effect is good, the big cavity of frequency band adjustable extent
Filter.
Summary of the invention
The purpose of the present invention is to solve the above problems, propose a kind of adjustable cavity body filter of a wide range of frequency band.This
Invention the adjustable cavity body filter of a wide range of frequency band have structure it is simple, broader bandwidth, insertion loss is smaller, return loss compared with
Greatly, the advantages that frequency band adjustable extent is larger, and isolation effect is good.
A kind of a wide range of adjustable cavity body filter of frequency band of the invention, comprising: resonant cavity (13), resonant cavity lid (14)
And the inner conductor in resonant cavity.
Inner conductor includes the first resonant rod (3), the second resonant rod (4), first window (5), the second window (6)；
First window (5) and the second window (6) are located at the center of resonant cavity (13), first window (5), the second window
(6) it is connect respectively with the antetheca of resonant cavity (13) and rear wall, has a gap among first window (5) and the second window (6)；First
Resonant rod (3), the second resonant rod (4) are located at the two sides of first window (5) and the second window (6), and about first window
(5) and the second window (6) is symmetrical；
First resonance disk (7) and the second resonant rod (4) connection, the second resonance disk (8) and the first tuning screw (9) are even
It connects, the first resonance disk (7) and the second resonance disk (8) form loading capacitance, rotate the first tuning screw counterclockwise
(9), the second resonance disk (8) rotates counterclockwise therewith, in turn, changes the first resonance disk (7) and the second resonance circle
The corresponding area of disk (8) changes the value of loading capacitance accordingly, passes through the corresponding area for changing two resonance disks in the present invention,
The corresponding value for changing loading capacitance；
Third resonance disk (10) and the first resonant rod (3) connection, the 4th resonance disk (11) and the second tuning screw
(12) it connects, third resonance disk (10) and the 4th resonance disk (11) formation loading capacitance rotate in a clockwise direction second
Tuning screw (12), the 4th resonance disk (11) are clockwise pivoted therewith, in turn, are changed third resonance disk (10) and the 4th
The corresponding area of resonance disk (11) changes the value of loading capacitance accordingly, passes through pair for changing two resonance disks in the present invention
Area is answered, the corresponding value for changing loading capacitance；
First resonant rod (3) and the second resonant rod (4) are welded on the bottom of resonant cavity (13), third resonance disk (10)
It is welded on the top of the first resonant rod (3), the first resonance disk (7) is welded on the top of the second resonant rod (4).
The antetheca that input port (1) and output port (2) pass through resonant cavity (13) enters in resonant cavity.And pass through screw,
Input port (1) and output port (2) are fixed on the antetheca of resonant cavity (13) respectively.
First tuning screw (9) is welded on the edge of the second resonance disk (8), and the second tuning screw (12) is welded on the 4th
The edge of resonance disk (11), rotates the first tuning screw (9) and the second tuning screw (12), the second resonance disk (8) and the
Four resonance disks (11) rotate with it respectively.First tuning screw (9) and the second tuning screw (12) both pass through resonant cavity lid
(14), and at the top of the first tuning screw (9) and the second tuning screw (12) add cap nut respectively, according to the first resonance disk
(7) respective distances between the second resonance disk (8) and the correspondence between third resonance disk (10) and the 4th resonance disk (11)
First tuning screw (9) and the second tuning screw (12), are fixed on certain ground by distance, the position of adjustment cap nut appropriate
Side.
Wherein, the material of resonant cavity (13) and resonant cavity lid (14) is copper；
Wherein, input port (1) and output port (2) are formed by coaxial line；
Wherein, the length of first window (5) and the second window (6), width, height are respectively l2=3mm, w2=15mm, h2
=10mm, the spacing d of two windows1=10mm；First resonant rod (3) is identical with the size of the second resonant rod (4), and length, wide
Degree, height are respectively l1=10mm, w1=8mm, h1=14mm；First resonance disk (7), the second resonance disk (8), third are humorous
It shakes disk (10), the radius of the 4th resonance disk (11) is R0=10mm, thickness are h3=1mm, the first resonance disk (7)
Spacing with the second resonance disk (8), third resonance disk (10) and the 4th resonance disk (11) is d2=4mm；First adjusts
The radius of humorous screw rod (9) and the second tuning screw (12) is R1=1mm is highly h4=21mm；Input port (1), output
The internal diameter R of port (2)in=0.65mm, length lin=33mm, outer diameter Rout=2.35mm, length lout=8mm；
Wherein, it rotates counterclockwise respectively the first tuning screw (9), rotate in a clockwise direction the second tuning screw
(12), the first resonance disk (7) and the first resonance disk (8), third resonance disk (10) and the 4th resonance disk (11) are corresponding
Area changes correspondingly respectively, and the frequency band of cavity body filter changes correspondingly.
The present invention has the advantages that
The present invention forms two loading capacitances by two pairs of resonance disks；By rotation tuning screw rod, change two pairs of resonance
The corresponding area of disk realizes that cavity body filter frequency band is adjustable；
The adjustable cavity body filter of a wide range of frequency band of the invention has structure simple, and broader bandwidth, insertion loss is smaller,
The advantages that return loss is larger, and frequency band adjustable extent is larger, and isolation effect is good.
Detailed description of the invention
Fig. 1 is the three dimensional structure diagram of the adjustable cavity body filter of a wide range of frequency band of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the corresponding area of two pairs of resonance disks under different angle；
Fig. 3 is influence of the different angle to resonance frequency；
Fig. 4 is insertion loss S under different angle21Emulation S parameter figure；
Fig. 5 is return loss S under different angle11Emulation S parameter figure；
In figure:
1- input port 2- output port the first resonant rod of 3-
4- the second resonant rod 5- first window the second window of 6-
7- the first resonance disk 8- the second resonance disk the first tuning screw of 9-
The 4th resonance disk the second tuning screw of 12- of 10- third resonance disk 11-
13- resonant cavity 14- resonant cavity lid
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
As shown in Figure 1, the adjustable cavity body filter of a wide range of frequency band of the preferred embodiment of the present invention, including resonant cavity 13,
Inner conductor in resonant cavity lid 14 and resonant cavity.
The material of 13 resonant cavity lid 14 of resonant cavity is copper.In a specific embodiment of the invention, resonant cavity 13
Length, width, height, thickness is respectively l0=101mm, w0=56mm, h0=33mm；d0=8mm, the length of resonant cavity lid 14
Degree, width, height are respectively l0=101mm, w0=56mm, d0=8mm.
First tuning screw 9 and the second tuning screw 12 pass through resonant cavity lid 14, can be by manually by side counterclockwise
To the first tuning screw 9 of rotation, rotate in a clockwise direction the second tuning screw 12, correspondingly rotates 8 He of the second resonance disk
4th resonance disk 11, thus, corresponding to change the first resonance disk 7 and the second resonance disk 8, third resonance disk 10 and the
The corresponding area of four resonance disks 11 indirectly changes the first resonance disk 7 and the second resonance disk 8, third resonance disk 10
The value of loading capacitance is formed by with the 4th resonance disk 11, to realize the adjustable purpose of cavity body filter frequency band.
As shown in Figure 1, first window 5 and the second window 6 are located at the center of resonant cavity 13, and first window 5 and
The antetheca of two windows 6 difference resonant cavity 13 is connected with rear wall, and the spacing between two windows is d1=10mm, 3 He of the first resonant rod
Second resonant rod 4 is located at the two sides of window, and arrives window at axial symmetry, the first resonant rod 3 and the second resonant rod 4 about window
The distance of mouth is e=8mm.
As shown in Figure 1, third resonance disk 10 is connect with the first resonant rod 3, the 4th resonance disk 11 and third resonance circle
10 spacing distance of disk is d2=4mm, and connect with the second tuning screw 12, third resonance disk 10 and 11 shape of the 4th resonance disk
At loading capacitance, rotate in a clockwise direction the second tuning screw 12, and the 4th resonance disk 11 rotates in a clockwise direction therewith,
To change the corresponding area of third resonance disk 10 and the 4th resonance disk 11.First resonance disk 7 and the second resonant rod 4 connect
It connects, the first resonance disk 7 and 8 spacing distance of the second resonance disk are d2=4mm, and connect with the first tuning screw 9, first is humorous
Shake disk 7 and the second resonance disk 8 formation loading capacitance, rotates the first tuning screw 9, the second resonance disk counterclockwise
8 rotate counterclockwise therewith, to change the corresponding area of the first resonance disk 7 and the second resonance disk 8.By manual
First tuning screw 9 and the second tuning screw 12 are rotated identical angle, θ by rotation, realize that cavity body filter frequency band is adjustable
Purpose.
As shown in Figure 1, input port 1 and output port 2 are formed by coaxial line, and it is respectively positioned on the same side of resonant cavity 13.
As shown in Figure 1, the first resonant rod 3 is identical with the size of the second resonant rod 4, and length, width are highly respectively
l1,w1,h1；The length of first window 5 and the second window 6, width, height are respectively l2,w2,h2, the spacing d of two windows1；Resonance
The radius of disk is R0, thickness is h3, the first resonance disk 7 and the second resonance disk 8, third resonance disk 10 and the 4th
The spacing of resonance disk 11 is d2；The radius of first tuning screw 9 and the second tuning screw 12 is R1, highly it is h4；It is humorous
The length of vibration chamber 13, width, height, thickness is respectively l0,w0,h0,d0；The length of resonant cavity lid 14, width, height is respectively
For l0,w0,d0；The internal diameter of coaxial line is Rin, length lin, outer diameter Rout, length lout；
In a preferred embodiment of the present invention, specific size is as follows: l0=101mm, w0=56mm, h0=33mm, d0
=8mm, l1=10mm, w1=8mm, h1=14mm, l2=3mm, w2=15mm, h2=10mm, d1=10mm, R0=10mm, h3=
1mm,d2=4mm, R1=1mm, h4=21mm, Rin=0.65mm, lin=33mm, Rout=2.35mm, lout=8mm.
Fig. 2 is shown by manually adjusting, and is rotated the first tuning screw 9 counterclockwise, is rotated in a clockwise direction
When the second tuning screw 12, the second resonance disk 8 and the 4th resonance disk 11 rotate with it respectively, when rotational angle is θ, the
One resonance disk 7 and the second resonance disk 8, the corresponding area figure of third resonance disk 10 and the 4th resonance disk 11.
Fig. 3 shows that tuning screw rotates influence of the different angles to the resonance frequency of cavity body filter, such as Fig. 3 institute
Show, with the increase of rotational angle θ, the frequency band of cavity body filter moves right therewith.
A specific embodiment of the invention is described below.
In the specific embodiment of the invention, the characteristic impedance of input port 1 and output port 2 is Z0=50 Ω,
The length of resonant cavity 13, width, height, thickness is respectively l0=101mm, w0=56mm, h0=33mm；d0=8mm；Resonant cavity
The length of lid 14, width, height are respectively l0=101mm, w0=56mm, d0=8mm；First resonant rod 3 and the second resonant rod
4 size is identical, and length, width, and height is respectively l1=10mm, w1=8mm, h1=14mm；First window 5 and the second window
The length of mouth 6, width, height are respectively l2=3mm, w2=15mm, h2=10mm, the spacing d of two windows1=10mm；Resonance circle
The radius of disk is R0=10mm, thickness are h3=1mm, the first resonance disk 7 and the second resonance disk 8, third resonance disk
10 and the 4th the spacing of resonance disk 11 be d2=4mm；The radius of first tuning screw 9 and the second tuning screw 12 is R1
=1mm is highly h4=21mm；The internal diameter R of coaxial linein=0.65mm, length lin=33mm, outer diameter Rout=2.35mm, it is long
Spend lout=8mm.
Fig. 4 shows the adjustable cavity body filter of a wide range of frequency band of the embodiment of the present invention, when rotation first manually simultaneously
When tuning screw 9 and the second tuning screw 12, the first resonance disk 7 and the second resonance disk 8, third resonance disk 10 and the 4th
Resonance disk 11 rotates with it respectively, when rotational angle is θ=0 °, at 30 °, 60 °, 90 °, 120 °, and insertion loss S21Emulation S
Parameter Map.
Fig. 5 shows the adjustable cavity body filter of a wide range of frequency band of the embodiment of the present invention, by manually adjusting, by the inverse time
Needle direction rotate the first tuning screw 9, rotate in a clockwise direction the second tuning screw 12 when, the second resonance disk 8 and the 4th
Resonance disk 11 rotates with it respectively, thus, the first resonance disk 7 and the second resonance disk 8, third resonance disk 10 and the 4th
The corresponding area of resonance disk 11 changes correspondingly respectively, when rotational angle is θ=0 °, at 30 °, 60 °, 90 °, 120 °, and insertion damage
Consume S11Emulation S parameter figure.
In test chart, S parameter is used to describe the signal transmitting situation between each port, and commonly using dB value indicates.S11Refer to
When all of the port matching connection loads, the reflection coefficient looked to input port, S11Indicate that energy can lead to mostly less than -10dB
Output port is crossed, the energy of only only a few is reflected back input port, and transmissibility is high；S21It indicates by input port to output port
Transmission coefficient, lower expression device loss is lower, and performance is better.
As shown in Figure 4 and Figure 5, when simultaneously, the first tuning screw 9 of rotation and the second tuning screw 12, rotational angle are manually
θ=0 °, at 30 °, 60 °, 90 °, 120 °, the frequency band of cavity body filter moves right.
Referring to fig. 4 and Fig. 5, it can be seen that the tunable center frequency of cavity body filter is 1.76GHz, and frequency band adjustable extent is about
It is 21.6%, relative bandwidth is about 6.4%, and insertion loss is less than 1dB, and return loss is greater than 10dB.
As it appears from the above, the adjustable cavity body filter of a wide range of frequency band of the invention, structure is simple, symmetrical, compact, practical,
By manual rotation tuning screw rod, change the corresponding area of two pairs of resonance disks accordingly, realizes that cavity body filter frequency band is adjustable
Performance.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (7)
1. a kind of adjustable cavity body filter of a wide range of frequency band, comprising: resonant cavity (13), in resonant cavity lid (14) and resonant cavity
Inner conductor；
Inner conductor includes the first resonant rod (3), the second resonant rod (4), first window (5), the second window (6)；
First window (5) and the second window (6) are located at the center of resonant cavity (13), first window (5), the second window (6)
It is connect respectively with antetheca, the rear wall of resonant cavity (13), gap is equipped among first window (5) and the second window (6)；First resonance
Bar (3), the second resonant rod (4) are located at the two sides of first window (5) and the second window (6), and about first window (5) and
Second window (6) is symmetrical；
Second resonant rod (4) one end connects the first resonance disk (7), and the other end connects resonant cavity (13) bottom, the first tuning spiral shell
Bar (9) is fixed across resonant cavity lid (14), and one end connects second resonance disk (8) edge, the first resonance disk (7) and second
Resonance disk (8) forms loading capacitance；
First resonant rod (3) one end connects third resonance disk (10), and the other end connects resonant cavity (13) bottom, the second tuning spiral shell
Bar (12) is fixed across resonant cavity lid (14), and one end connects the 4th resonance disk (11) edge, third resonance disk (10) and
4th resonance disk (11) forms loading capacitance；
Input port (1), output port (2) pass through resonant cavity (13), are fixed on the antetheca of resonant cavity (13), input port
(1), output port (2) enters in resonant cavity；
The input port (1) and output port (2) is formed by coaxial line, is respectively positioned on the same side of resonant cavity (13)；
When first tuning screw (9) rotates counterclockwise, the second resonance disk (8) turns counterclockwise therewith
It is dynamic, and then change the corresponding area of the first resonance disk (7) and the second resonance disk (8), the corresponding value for changing loading capacitance；
Second tuning screw (12) rotates in a clockwise direction, and the 4th resonance disk (11) is clockwise pivoted therewith,
And then change the corresponding area of third resonance disk (10) and the 4th resonance disk (11), the corresponding value for changing loading capacitance.
2. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1, the resonant cavity (13) is harmonious
The material of chamber lid of shaking sub (14) is copper.
3. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1, the first window (5) and
Two windows (6) size is identical, length, width, and height is respectively l2=3mm, w2=15mm, h2=10mm, the spacing d of two windows1
=10mm.
4. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1, first resonant rod (3) and
Second resonant rod (4) size is identical, length, width, and height is respectively l1=10mm, w1=8mm, h1=14mm.
5. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1, the first resonance disk
(7), the second resonance disk (8), third resonance disk (10), the 4th resonance disk (11) radius be R0=10mm, thickness
It is h3=1mm, the first resonance disk (7) and the second resonance disk (8), third resonance disk (10) and the 4th resonance disk
(11) spacing is d2=4mm.
6. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1, first tuning screw (9)
Radius with the second tuning screw (12) is R1=1mm is highly h4=21mm.
It is the input port (1), defeated 7. a kind of a wide range of adjustable cavity body filter of frequency band according to claim 1
Exit port (2) size is identical, internal diameter Rin=0.65mm, length lin=33mm, outer diameter Rout=2.35mm, length lout=8mm.
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| CN201610140998.4A CN105789791B (en) | 2016-03-11 | 2016-03-11 | A kind of adjustable cavity body filter of a wide range of frequency band |
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| CN201610140998.4A CN105789791B (en) | 2016-03-11 | 2016-03-11 | A kind of adjustable cavity body filter of a wide range of frequency band |
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| CN105789791B true CN105789791B (en) | 2019-02-22 |
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| CN111326842A (en) * | 2018-12-14 | 2020-06-23 | 中兴通讯股份有限公司 | Resonator and filter |
| CN110021804A (en) * | 2019-03-28 | 2019-07-16 | 摩比天线技术（深圳）有限公司 | Simple resonant rod drop frequency structure and its filter |
| CN110717262B (en) * | 2019-09-27 | 2023-04-07 | 深圳市华讯方舟微电子科技有限公司 | Simulation method and simulation device for C-band waveguide filter and terminal |
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| US20060006966A1 (en) * | 2004-07-08 | 2006-01-12 | Qinghua Kang | Electronically tunable ridged waveguide cavity filter and method of manufacture therefore |
| KR100918791B1 (en) * | 2007-08-28 | 2009-09-25 | 주식회사 에이스테크놀로지 | Frequency Tunable Filter |
| FI124178B (en) * | 2011-06-08 | 2014-04-15 | Powerwave Finland Oy | Adjustable resonator |
| CN102945994A (en) * | 2012-12-04 | 2013-02-27 | 成都赛纳赛德科技有限公司 | Rotary adjustable filter |
| CN204927470U (en) * | 2015-09-07 | 2015-12-30 | 李登峰 | Miniaturized cavity filter |
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