CN107464981A - A kind of determination method of filter cavity interval film length - Google Patents
A kind of determination method of filter cavity interval film length Download PDFInfo
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- CN107464981A CN107464981A CN201710180204.1A CN201710180204A CN107464981A CN 107464981 A CN107464981 A CN 107464981A CN 201710180204 A CN201710180204 A CN 201710180204A CN 107464981 A CN107464981 A CN 107464981A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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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
The invention provides a kind of determination method of filter cavity interval film length,It is related to electronic technology field,The data such as the length of resonant cavity spacer film and the number of turns of spiral winding are drawn according to simulation software,And basis filters housing is made according to simulation result,And make the mantle of different length,Coordinate debugging using the mantle of various length,It can obtain final diaphragm length,The determination process of four diaphragm lengths between filter resonance cavity of the present invention is reversible,Realized rapidly by changing cover die,During experiment,Coating in cavity is not damaged,Suppressing index can accurately adjust,The Insertion Loss index subsequently debugged is relatively more accurate,Only relying on detecting instrument in experiment process can just complete,The cost of material is low for sample and mantle manufacturing process,Electroplating cost is low,And it can recycle,The inventive method is simple,Processing step is simple,With reversible regulatory function,It is practical,Using effect is good,It is easy to promote the use of.
Description
Technical field
The present invention relates to electronic technology field, especially a kind of determination method of wave filter diaphragm length.
Background technology
Four diaphragm lengths between five section screw-filter resonant cavities, are the Out-of-band rejection indexs for determining wave filter
Critical size, after filter cavity emulation is completed, it is necessary first to four diaphragm lengths between filter resonance cavity
And the difference of two pairs of barrier films is adjusted, after the resonator interval film length of wave filter is determined, insertion could be adjusted
Loss and return loss index.
Four diaphragm lengths between existing filter resonance cavity determine that method has two：
A kind of method is according to simulation result, and four barrier films are accomplished into resonator is most long, then progressively with milling machine four
Diaphragm length reduces；Another method is according to simulation result, and four barrier films are accomplished that resonator is most short, then progressively use band
The copper sheet of self-adhesive gradually lengthens four barrier films, so do exist process repeatedly, time length, waste of resource, it is difficult to it is accurate really
Determine final size.
The content of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of determination side of filter cavity interval film length
Method, filter cavity interval film length is adjusted by changing mantle, can within the shortest time with the cost of minimum it is rapid,
Most rational difference accurately determining diaphragm length and two diaphragm lengths, makes the Out-of-band rejection index of wave filter reach most
Good state.
The detailed step of the technical solution adopted for the present invention to solve the technical problems is as follows：
Step 1：Design insertion loss, return loss and suppress index request, In-put design index, imitated using HFSS high frequencies
True software is emulated, and is required according to the Insertion Loss of screw-filter, and the minimum for determining resonator q is 400, and is drawn following
Data：
1. the length of each resonant cavity is the length of adjacent resonators body spacer film；
2. the number of turns and the earth point position of spiral winding；
3. two tap lines welding position on spiral winding respectively；
Step 2：Make basis filters housing
29MHz~89MHz frequency averaging is divided into 24 sections, every section with a width of 2.5MHz, using initial frequency as
29MHz, terminal frequency are wave filter based on 31.5MHz wave filter；
According to the simulation result of step 1, the housing of basis filters is made, wherein diaphragm length is according in step 1
1. the length of adjacent resonators body spacer film subtracts 2 millimeters of making in bar；
4 barrier films of basis filters are divided into locating dowel and outer positioning arc two saves, and the section close to coupling screws is in just
The locating dowel of square-section, the length of side of locating dowel square is 0.95 millimeter, and along barrier film formed symmetrical, away from coupling screws
A section, to close on two ribs of locating dowel as axle, two radiuses of milling are 0.95 millimeter of quadrant cambered surface respectively,
The distance of referred to as outer positioning arc, one convex barrier film of formation, locating dowel and convex barrier film is 2.05 millimeters；
The basis filters of making are according to design requirement electrosilvering, silver thickness >=7um；
Step 3：Make mantle
Using brass as material, working height is identical with basis filters cavity depth, width and basis filters cavity every
The equal mantle of film width, the side on mantle with barrier film with width, milling contain the groove of two cambered surfaces, two arcs of groove
Face positions arc in being referred to as, and the quadrant that arc is 0.9 millimeter, the i.e. depth of groove and the radius of interior positioning arc are positioned in two
It is identical, hit exactly 1.9 millimeters away from bottom portion of groove positions, the square positioning hole of a length of 1.05 millimeters of cutting edge, corner with
R0.3mm circle carries out clear angle, and the position of related features of mantle is controlled within ± 0.1mm, and ensure flatness ± 0.05mm it
It is interior；
Make 80 groups of mantles, every group of mantle 2, square positioning hole away from groove while to mantle un-grooved while away from
It see the table below from the size for Y, Y：
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Y (millimeter) | 1.0 | 1.3 | 1.6 | 1.9 | 2.2 | 2.5 | 2.8 | 3.1 | 3.4 | 3.7 |
| Numbering | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Y (millimeter) | 4.0 | 4.3 | 4.6 | 4.9 | 5.2 | 5.5 | 5.8 | 6.1 | 6.4 | 6.7 |
| Numbering | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Y (millimeter) | 7.0 | 7.3 | 7.6 | 7.9 | 8.2 | 8.5 | 8.8 | 9.1 | 9.4 | 9.7 |
| Numbering | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| Y (millimeter) | 10 | 10.3 | 10.6 | 10.9 | 11.2 | 11.5 | 11.8 | 12.1 | 12.4 | 12.7 |
| Numbering | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
| Y (millimeter) | 13 | 13.3 | 13.6 | 13.9 | 14.2 | 14.5 | 14.8 | 15.1 | 15.4 | 15.7 |
| Numbering | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
| Y (millimeter) | 16 | 16.3 | 16.6 | 16.9 | 17.2 | 17.5 | 17.8 | 18.1 | 18.4 | 18.7 |
| Numbering | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
| Y (millimeter) | 19 | 19.3 | 19.6 | 19.9 | 20.2 | 20.5 | 20.8 | 21.1 | 21.4 | 21.7 |
| Numbering | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| Y (millimeter) | 22 | 22.3 | 22.6 | 22.9 | 23.2 | 23.5 | 23.8 | 24.1 | 24.4 | 24.157 |
Electrosilvering, silver coating thickness >=7um are carried out after making 80 groups of mantles according to upper table size；
Step 4：Installation foundation wave filter
It is installed on basis filters housing according to the spiral winding that step 1 simulation result makes, is welded according to simulation result
One of tap line is connect to spiral winding, other one of tap line is welded on the inner wire of connector, frequency screw and coupling
Screw is closed to screw in the screw hole of basis filters housing；
One group of 2 mantle that numbering is 1 are taken, are respectively fitted on No. 2 barrier films and No. 3 barrier film locating dowels, take that numbering is 2 one
Group 2 mantles, be respectively fitted in the locating dowel of No. 1 barrier film and No. 4 barrier films, after the completion of cover cover plate；
Step 5：Debug basis filters
1. two of vector network analyzer is connected with two connectors of wave filter respectively, five spiral windings are adjusted
Length, make five frequency screws enter filter cavity inside 10~15 millimeters；
2. five frequency screws of adjustment make passband screw coupling screws with centre frequency point symmetry, make passband waveform in etc.
Waist is trapezoidal；
3. changing the mantle of other groups successively according to the order of numbering from small to large on No. 1 barrier film and No. 4 barrier films, that is, cover
Film length is continuously increased, and is madeWithPosition is preferably minimized, it is describedCentered on after Frequency point subtracts 3.75MHz
The suppression index of frequency location,Centered on Frequency point add 3.75MHz frequency location suppression index, the lowest order
Finger is put when mantle length change, on vector network analyzer wavy lineWithPosition reduces all the time, when becoming again
When changing set film length,WithPosition goes up not down, thenWith What position reduced all the timeWithPosition be exactly " extreme lower position "；
Change the mantle of other groups, i.e. mantle successively according to the order of numbering from small to large on No. 2 barrier films and No. 3 barrier films
Length is continuously increased, and is madeWithExtreme higher position is lifted to, it is describedFor the insertion loss index of following frequency,It is the insertion loss index of top frequency；It is describedWithExtreme higher position refer to every time to change mantle length
When spending, on vector network analyzer wavy lineWithPosition can all raise with the change of set film length, when again
During change set film length,WithPosition does not rise anti-drop, then upper oneWith Position be exactly " most
High position "；
WhenWithReach extreme lower position, andWithWhen reaching extreme higher position, resonant cavity is measured
The total length of the jacketed film of interior 4 barrier films, 4 obtained length are now measured, be exactly the basis filter that centre frequency is 30.25MHz
The final lengths of 5 resonator spacer films of ripple device；
Step 6：Repeat step 4 and step 5, you can determine successively centre frequency be respectively 32.75MHz, 35.25MHz,
The final diaphragm length of 37.75MHz, 40.25MHz ... ... 87.75MHz other 23 wave filters.
The present invention has the beneficial effect that：
1st, the determination process of four diaphragm lengths between filter resonance cavity is reversible, once think reverse adjustment,
Can be realized rapidly by changing spare part, and spare part be it is recycled, and it is existing with milling machine reduce diaphragm length
Method, can only reduce to increase.
2nd, during experiment, coating in cavity is not damaged, and suppressing index can accurately adjust, and the Insertion Loss subsequently debugged refers to
Mark is relatively more accurate, the existing method for reducing diaphragm length with milling machine, it is necessary to the silver coating damaged in cavity.It is if extensive
Multiple coating just needs first strip to plate again again, produces repetition and waste.
3rd, only only relying on detecting instrument in experiment process can complete, and the existing side for reducing diaphragm length using milling machine
Method, milling device is also needed to coordinate completion in addition to detecting instrument is crossed.
4th, test specimen and spare part are all completed using machining, are devised positioning, orienting device, can be ensured humorous
The accuracy of four diaphragm lengths to shake between cavity and can accurate measurement, therefore this method success rate is high, and existing
The method of film length is covered by the copper sheet with self-adhesive, hand moulding inaccuracy be present, paste position is inaccurate, it is difficult to measures
The shortcomings of accurate.
5th, the cost of material is low for sample and spare part manufacturing process, and electroplating cost is low, and can recycle, and existing existing
Some reduces the method for diaphragm length with milling machine, or covers the method for film length by the copper sheet with self-adhesive, system all be present
Make the weakness that cost is high or electroplating cost is high.
In summary, the inventive method is simple, and processing step is simple, has reversible regulatory function, practical, uses effect
Fruit is good, is easy to promote the use of.
Brief description of the drawings
Fig. 1 is the basis filters body diagram of the present invention.
Fig. 2 is the mantle structural representation of the present invention.
Fig. 3 is the mantle dimensional drawing of the present invention.
Fig. 4 is outer the positioning arc and locating dowel scale diagrams of the present invention.
Fig. 5 is the debugging filter schematic of the present invention.
Fig. 6 is the debugging Filter specification effect diagram of the present invention.
Wherein, 1-1 barrier films, 2-2 barrier films, 3-3 barrier films, 4-4 barrier films position arc outside 5-, 6- locating dowels, and 7- is fixed
Position hole, the interior positioning arcs of 8-, 9- tap lines, 10- coils, 11- frequency screws, 12- coupling screws, 13- connectors, 14- mantles,
15- resonators.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Step 1：Design insertion loss, return loss and suppress index request, In-put design index, imitated using HFSS high frequencies
True software is emulated, and is required according to the Insertion Loss of screw-filter, and the minimum for determining resonator q is 400, and is drawn following
Data：
1. the length of each resonant cavity is the length of adjacent resonators body spacer film；
2. the number of turns and the earth point position of spiral winding；
3. two tap lines welding position on spiral winding respectively；
Step 2：Make basis filters housing
29MHz~89MHz frequency averaging is divided into 24 sections, every section with a width of 2.5MHz, using initial frequency as
29MHz, terminal frequency are wave filter based on 31.5MHz wave filter；
According to the simulation result of step 1, the housing of basis filters is made, wherein diaphragm length is according in step 1
1. the length of adjacent resonators body spacer film subtracts 2 millimeters of making in bar, basis filters housing is as shown in Figure 1.
Outer positioning arc and locating dowel scale diagrams are as shown in figure 4,4 barrier films of basis filters are divided into locating dowel and outer
Positioning arc two saves, and the section close to coupling screws is the locating dowel in square section, and the length of side of locating dowel square is 0.95
Millimeter, and along barrier film formed symmetrical, in the section away from coupling screws, using two ribs for closing on locating dowel as axle, distinguish milling
Two radiuses are 0.95 millimeter of quadrant cambered surface, are referred to as outer positioning arc, form a convex barrier film, locating dowel with it is convex
The distance of type barrier film is 2.05 millimeters；
The basis filters of making are according to design requirement electrosilvering, silver thickness >=7um；
Step 3：Make mantle
Mantle structural representation as shown in Fig. 2 mantle dimensional drawing as shown in figure 3, using brass as material, working height and base
Plinth filter cavity depth is identical, the width mantle equal with basis filters cavity barrier film width, same with barrier film on mantle
The side of width, milling contain the groove of two cambered surfaces, and two cambered surfaces of groove are referred to as interior positioning arc, and it is 0.9 to position arc in two
The quadrant of millimeter, the i.e. depth of groove are identical with the radius of interior positioning arc, 1.9 millimeters away from bottom portion of groove positions just
In, the square positioning hole of a length of 1.05 millimeters of cutting edge, corner carries out clear angle, the position of related features control of mantle with R0.3mm circle
System ensures flatness within ± 0.05mm within ± 0.1mm；
Make 80 groups of mantles, every group of mantle 2, square positioning hole away from groove while to mantle un-grooved while away from
It see the table below from the size for Y, Y：
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Y (millimeter) | 1.0 | 1.3 | 1.6 | 1.9 | 2.2 | 2.5 | 2.8 | 3.1 | 3.4 | 3.7 |
| Numbering | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Y (millimeter) | 4.0 | 4.3 | 4.6 | 4.9 | 5.2 | 5.5 | 5.8 | 6.1 | 6.4 | 6.7 |
| Numbering | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Y (millimeter) | 7.0 | 7.3 | 7.6 | 7.9 | 8.2 | 8.5 | 8.8 | 9.1 | 9.4 | 9.7 |
| Numbering | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| Y (millimeter) | 10 | 10.3 | 10.6 | 10.9 | 11.2 | 11.5 | 11.8 | 12.1 | 12.4 | 12.7 |
| Numbering | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
| Y (millimeter) | 13 | 13.3 | 13.6 | 13.9 | 14.2 | 14.5 | 14.8 | 15.1 | 15.4 | 15.7 |
| Numbering | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
| Y (millimeter) | 16 | 16.3 | 16.6 | 16.9 | 17.2 | 17.5 | 17.8 | 18.1 | 18.4 | 18.7 |
| Numbering | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
| Y (millimeter) | 19 | 19.3 | 19.6 | 19.9 | 20.2 | 20.5 | 20.8 | 21.1 | 21.4 | 21.7 |
| Numbering | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| Y (millimeter) | 22 | 22.3 | 22.6 | 22.9 | 23.2 | 23.5 | 23.8 | 24.1 | 24.4 | 24.157 |
Electrosilvering, silver coating thickness >=7um are carried out after making 80 groups of mantles according to upper table size；
Step 4：Installation foundation wave filter
The schematic diagram of wave filter is debugged as shown in figure 5, the spiral winding made according to step 1 simulation result is installed to basis
On casing of filter, one of tap line is welded to spiral winding according to simulation result, the other company of being welded to of tap line
Connect on the inner wire of device, frequency screw and coupling screws are screwed in the screw hole of basis filters housing；
One group of 2 mantle that numbering is 1 are taken, are respectively fitted on No. 2 barrier films and No. 3 barrier film locating dowels, take that numbering is 2 one
Group 2 mantles, be respectively fitted in the locating dowel of No. 1 barrier film and No. 4 barrier films, after the completion of cover cover plate；
Step 5：Debug basis filters
1. two of vector network analyzer is connected with two connectors of wave filter respectively, five spiral windings are adjusted
Length, make five frequency screws enter filter cavity inside 10~15 millimeters；
2. five frequency screws of adjustment make passband screw coupling screws with centre frequency point symmetry, make passband waveform in etc.
Waist is trapezoidal；
3. changing the mantle of other groups successively according to the order of numbering from small to large on No. 1 barrier film and No. 4 barrier films, that is, cover
Film length is continuously increased, and is madeWithPosition is preferably minimized, it is describedCentered on after Frequency point subtracts 3.75MHz
The suppression index of frequency location,Centered on Frequency point add 3.75MHz frequency location suppression index, the lowest order
Finger is put when mantle length change, on vector network analyzer wavy lineWithPosition reduces all the time, when becoming again
When changing set film length,WithPosition goes up not down, thenWith What position reduced all the timeWithPosition be exactly " extreme lower position "；
Change the mantle of other groups, i.e. mantle successively according to the order of numbering from small to large on No. 2 barrier films and No. 3 barrier films
Length is continuously increased, and is madeWithExtreme higher position is lifted to, it is describedFor the insertion loss index of following frequency,It is the insertion loss index of top frequency；It is describedWithExtreme higher position refer to every time to change mantle length
When spending, on vector network analyzer wavy lineWithPosition can all raise with the change of set film length, when again
During change set film length,WithPosition does not rise anti-drop, then upper oneWith Position be exactly " most
High position "；
WhenWithReach extreme lower position, andWithWhen reaching extreme higher position, resonant cavity is measured
The total length of the jacketed film of interior 4 barrier films, 4 obtained length are now measured, be exactly the basis filter that centre frequency is 30.25MHz
The final lengths of 5 resonator spacer films of ripple device；
Step 6：Repeat step 4 and step 5, you can determine successively centre frequency be respectively 32.75MHz, 35.25MHz,
The final diaphragm length of 37.75MHz, 40.25MHz ... ... 87.75MHz other 23 wave filters.
Fig. 6 is the effect diagram of present invention debugging basis filters index, the state in figure is reached when index, then state
Most preferably.
Claims (1)
1. the determination method of a kind of filter cavity interval film length, it is characterised in that comprise the steps：
Step 1：Design insertion loss, return loss and suppress index request, In-put design index, emulated using HFSS high frequencies soft
Part is emulated, and is required according to the Insertion Loss of screw-filter, and the minimum for determining resonator q is 400, and draws following number
According to：
1. the length of each resonant cavity is the length of adjacent resonators body spacer film；
2. the number of turns and the earth point position of spiral winding；
3. two tap lines welding position on spiral winding respectively；
Step 2：Make basis filters housing
29MHz~89MHz frequency averaging is divided into 24 sections, every section with a width of 2.5MHz, using initial frequency as 29MHz, end
Wave filter based on the wave filter that dot frequency is 31.5MHz；
According to the simulation result of step 1, make the housing of basis filters, wherein diaphragm length according in step 1 1. article
The length of middle adjacent resonators body spacer film subtracts 2 millimeters of making；
4 barrier films of basis filters are divided into locating dowel and outer positioning arc two saves, and the section close to coupling screws is square
The locating dowel in section, the length of side of locating dowel square is 0.95 millimeter, and along barrier film formed symmetrical, in one away from coupling screws
Section, to close on two ribs of locating dowel as axle, two radiuses of milling are 0.95 millimeter of quadrant cambered surface respectively, are referred to as
The distance of outer positioning arc, one convex barrier film of formation, locating dowel and convex barrier film is 2.05 millimeters；
The basis filters of making are according to design requirement electrosilvering, silver thickness >=7um；
Step 3：Make mantle
Using brass as material, working height is identical with basis filters cavity depth, and width and basis filters cavity barrier film are wide
Equal mantle is spent, the side on mantle with barrier film with width, milling contains the groove of two cambered surfaces, and two cambered surfaces of groove claim
The quadrant that arc is 0.9 millimeter, the i.e. depth of groove and the interior radius phase for positioning arc are positioned for interior positioning arc, in two
Together, hit exactly 1.9 millimeters away from bottom portion of groove positions, the square positioning hole of a length of 1.05 millimeters of cutting edge, corner is with R0.3mm
Circle carry out clear angle, the position of related features of mantle is controlled within ± 0.1mm, and ensures flatness within ± 0.05mm；
Make 80 groups of mantles, every group of mantle 2, square positioning hole away from groove while to mantle un-grooved while distance be
Y, Y size see the table below：
Electrosilvering, silver coating thickness >=7um are carried out after making 80 groups of mantles according to upper table size；
Step 4：Installation foundation wave filter
It is installed on basis filters housing according to the spiral winding that step 1 simulation result makes, is taken out according to simulation result welding
Head one of line is on spiral winding, and other one of tap line is welded on the inner wire of connector, frequency screw and coupling spiral shell
Nail is screwed in the screw hole of basis filters housing；
One group of 2 mantle that numbering is 1 are taken, are respectively fitted on No. 2 barrier films and No. 3 barrier film locating dowels, take that numbering is 2 one group 2
Individual mantle, be respectively fitted in the locating dowel of No. 1 barrier film and No. 4 barrier films, after the completion of cover cover plate；
Step 5：Debug basis filters
1. two of vector network analyzer is connected with two connectors of wave filter respectively, the length of five spiral windings is adjusted
Degree, five frequency screws are made to enter inside filter cavity 10~15 millimeters；
2. five frequency screws of adjustment make passband be screwed coupling screws with centre frequency point symmetry, be made passband waveform in isosceles ladder
Shape；
3. changing the mantle of other groups successively according to the order of numbering from small to large on No. 1 barrier film and No. 4 barrier films, i.e. mantle is grown
Degree is continuously increased, and makes " ▽ 1 " and " ▽ 4 " is preferably minimized position, and described " Frequency point subtracts the frequency after 3.75MHz centered on ▽ 1 "
The suppression index of position, " Frequency point adds the suppression index of 3.75MHz frequency location centered on ▽ 4 ", and the extreme lower position refers to
When mantle length change, on vector network analyzer wavy line " ▽ 1 " and " positions of ▽ 4 " reduce all the time, when again change set
During film length, " ▽ 1 " and " positions of ▽ 4 " go up not down, then " ▽ 1 " and " " ▽ 1 " and " ▽ 4 " that the positions of ▽ 4 " reduce all the time
Position be exactly " extreme lower position "；
Change the mantle of other groups successively according to the order of numbering from small to large on No. 2 barrier films and No. 3 barrier films, that is, cover film length
It is continuously increased, makes " ▽ 2 " and " ▽ 3 " is lifted to extreme higher position, described, and " ▽ 2 " is the insertion loss index of following frequency, " ▽ 3 "
It is the insertion loss index of top frequency；It is described " ▽ 2 " and " ▽ 3 " extreme higher position refers to when each change set film length,
On vector network analyzer wavy line " ▽ 2 " and " positions of ▽ 3 " all can with set film length change and raise, when again change set
During film length, " ▽ 2 " and " positions of ▽ 3 " do not rise anti-drop, then upper one " ▽ 2 " and " ▽ 3 " position is exactly " extreme higher position "；
As " ▽ 1 " and " ▽ 4 " reaches extreme lower position, and " ▽ 2 " and " when ▽ 3 " reaches extreme higher position, measures in resonant cavity 4
The total length of the jacketed film of barrier film, 4 obtained length are now measured, exactly centre frequency is 30.25MHz basis filters
The final lengths of 5 resonator spacer films；
Step 6：Repeat step 4 and step 5, you can determine successively centre frequency be respectively 32.75MHz, 35.25MHz,
The final diaphragm length of 37.75MHz, 40.25MHz ... ... 87.75MHz other 23 wave filters.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108493538A (en) * | 2018-04-11 | 2018-09-04 | 广东通宇通讯股份有限公司 | A kind of cavity body filter that can adjust stiffness of coupling |
| CN109244617A (en) * | 2018-10-16 | 2019-01-18 | 广东通宇通讯股份有限公司 | A kind of metal plate resonance piece filter |
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| CN108493538B (en) * | 2018-04-11 | 2024-04-16 | 广东通宇通讯股份有限公司 | Cavity filter capable of adjusting coupling strength |
| CN109244617A (en) * | 2018-10-16 | 2019-01-18 | 广东通宇通讯股份有限公司 | A kind of metal plate resonance piece filter |
| CN109244617B (en) * | 2018-10-16 | 2024-01-05 | 广东通宇通讯股份有限公司 | Sheet metal resonant sheet filter |
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