CN2059532U - Low-loss, wide-band and high-pass wave filter - Google Patents
Low-loss, wide-band and high-pass wave filter Download PDFInfo
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- CN2059532U CN2059532U CN 88218875 CN88218875U CN2059532U CN 2059532 U CN2059532 U CN 2059532U CN 88218875 CN88218875 CN 88218875 CN 88218875 U CN88218875 U CN 88218875U CN 2059532 U CN2059532 U CN 2059532U
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- coaxial
- transmission line
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Abstract
The utility model discloses a microwave wide band and high pass filter in pass band with low loss. The utility model fully adopts a lumped element in the coaxial transmission line analog filter of distribution parameter; capacitances which are connected in serial adopt an open circuit coaxial line with low characteristic resistance; inductors in parallel connection adopt short circuit coaxial line with high characteristic resistance. The produced sample according to the utility model has good performance, and the loss of the utility model is lower than the loss of the similar filters in the world presently. The utility model which has the advantages of small volume, compact structure, convenient manufacture, and good repeatability can be widely used for microwave communication on ground and satellite communication.
Description
The utility model is a kind of wide-band microwave high pass filter with minimum loss, and it has purposes widely in terrestrial microwave communication, satellite communication.
High pass filter (Ji Aiermasaai (the GLM that the most approaching existing technology of the present utility model is half lumped parameter
aTthaei) " microwave filter, impedance matching network and coupled structure ").In this structure, inductance is realized with short-circuit coaxial line in parallel, series capacitance lumped parameter form, and promptly each electric capacity all constitutes with the pair of metal disk that medium separates.And the diameter of disk is much larger than each diameter to the disk connecting line.Thisly connect the structure instability, thereby cause the change of capacitance.Because on the structure big discontinuity is arranged, this just causes the increase of voltage standing wave ratio, passband narrows down, and loss increases.
The purpose of this utility model is: the broadband high-pass wave-wave device that provides a kind of passband simple in structure, easy to make to have minimum loss.
Task of the present utility model is finished in the following manner: all adopt coaxial transmission line to come inductance and electric capacity in the mimic high pass filter.Series capacitance adopts low characteristic impedance open circuit coaxial line, and shunt inductance adopts the short-circuit coaxial line of high characteristic impedance.
Architectural feature of the present utility model is: two metal derbies are screwed together, at the interface place of two metal derbies one through hole are arranged, and its hole wall just constitutes the coaxial transmission line outer conductor, and the diameter in hole is called the coaxial transmission line overall diameter.Have several through holes to link to each other with the coaxial transmission line outer conductor on a metal derby therein, these hole walls constitute the shunt inductance coaxial outer conductor, and its diameter is called shunt inductance coaxial line overall diameter.The center conductor of coaxial transmission line is formed by plurality of sections metallic conductor serial connection, and the diameter of these metallic conductors is called interior diameter.Hang down the open circuit coaxial line of characteristic impedance in section with the place's of the serial connection formation between the section, be used for the series capacitance of analog filter.The two ends of heart conductor are joints therein, have the hat medium socket to fill between each open circuit coaxial line metal inner wire and outer conductor.Be connected to shunt inductance coaxial line center conductor between each serial connection place of coaxial transmission line center conductor, simultaneously movably short-circuit plunger be installed all in the shunt inductance coaxial outer conductor, this has just constituted the shunt inductance short-circuit coaxial line of high characteristic impedance.
The metallic conductor hop count of coaxial transmission line center conductor and the number of shunt inductance short-circuit coaxial line are decided by designing requirement.
Preferred plan of the present utility model is.The equal diameters of each section of coaxial transmission line center conductor, the characteristic impedance of each series capacitance coaxial line is identical, and (outward) diameter also equates in it.Change its capacitance by the length that changes metallic conductor in the series capacitance open circuit coaxial line.The shunt inductance short-circuit coaxial line is vertical with coaxial transmission line, and the characteristic impedance of each shunt inductance short-circuit coaxial line equates, (outward) equal diameters in it.
Because the utility model has adopted open circuit coaxial line artificial capacitor, so Stability Analysis of Structures, reliable, this has just guaranteed the stable of capacitance.Installation, dismounting and debugging are also very convenient, only change open circuit coaxial inner conductor length and can change capacitance.Simultaneously, the length of the coaxial transmission line center conductor between the joint remains unchanged, and this brings great benefit to debugging.In addition, the equal diameters of each section of coaxial transmission line center conductor, this has just reduced structural discontinuity greatly.Also can be silver-plated to each metalwork of filter.Therefore, adopt the utility model structure can make the inductance quality factor in the filter very big, the angle of loss of electric capacity is very little.
The capacitor C of known high pass filter
i(picofarad) and inductance (nanohenry) just can be obtained corresponding coaxial line length S according to formula
iAnd S
j, promptly
S
i＝
Z
CC
i（i＝1，3，5，7，9，11） （1）
S
j＝ (300Li)/(Z
L) （j＝2，4，6，8，10） （2）
Wherein, Z
C, Z
LBe respectively the characteristic impedance of open circuit coaxial line and short-circuit coaxial line, unit is ohm, and ε r is the dielectric constant of filled media in the open circuit coaxial line.
Below in conjunction with accompanying drawing the utility model is described further.Situation when it is reactance element number of packages N=11.
Fig. 1 is the front section view of filter, and Fig. 2 is a side sectional view, and Fig. 3 is the partial enlarged drawing at 13 positions among Fig. 1, and Fig. 4 is a first kind T type bar enlarged drawing, and Fig. 5 is the second class T type bar enlarged drawing.
Two metal derbies (3) and (12) among Fig. 1 are screwed together, there is a circular hole at its interface place, its hole wall is exactly the coaxial transmission line outer conductor, the diameter in hole is exactly the overall diameter of coaxial transmission line, in metal derby (3), there are 5 through holes and coaxial transmission line outer conductor to intersect vertically, its hole wall is exactly the shunt inductance coaxial outer conductor, its diameter is exactly a shunt inductance coaxial line overall diameter, (5) (7) and (9) are first kind T type bars, (6) and (8) be the second class T type bar, more than 5 T type bars insert in the through hole according to the back that is linked in sequence shown in Figure 1, in 5 through holes, load onto 5 movably short-circuit plungers (4) again, and are decided to get up in they and metal derby (3) group with screw.In order to make each section of coaxial transmission line center conductor mutually insulated, between each series capacitance open circuit coaxial line inner and outer conductor, all use hat PTFE medium cover (11) to fill.One end of the coaxial transmission line center conductor linkage section (10) that is connected with joint has a hole, and its hole wall also is a series capacitance open circuit coaxial outer conductor, and the other end has an aperture, is used for welding the center conductor of SMA socket.The center conductor of two SMA sockets (1) couples together with coaxial transmission crossing heart conductor linkage section (10) respectively.Use screw (2) that each several part, SMA socket etc. in the coaxial transmission line are fixed up at last, thereby the utility model install.
Fig. 3 has shown two detailed structure that T type bar connects at (13) position.
The detailed structure of first kind T type bar as shown in Figure 4.Shunt inductance coaxial line center conductor (41), coaxial transmission line central conductor section (42) and the central inner conductor (43) of series capacitance open circuit coaxial line, the method that shows according to Fig. 4 are designed to T type bar.
Fig. 5 is the detailed structure view of the second class T type bar.Shunt inductance coaxial line center conductor (51) coaxial transmission line central conductor section (52) is by the second class T type bar that is designed to shown in Figure 5.(52) it is the hole of φ 2 that there is a diameter at two ends, and hole wall is exactly a series capacitance open circuit coaxial outer conductor.(43) in the first kind T type bar are inserted in the hole of the second class T type bar (52), and fill with hat PTFE medium cover, and this just constitutes the open circuit coaxial line of series capacitance.
Here, (outward) conductor diameter is all got identical value in all series capacitance coaxial lines, therefore just can change its capacitance as long as change the length of center conductor, and capacitance can be calculated by formula and provide.
Be two embodiment of the present invention below, and provide test result.
Adopt the present invention to design 1-2, the high pass filter of two frequency ranges of 2-4GHZ.Select N=11 for use, rising and falling is the equal ripple response of 0.1dB.Can get the capacitor C of high pass filter by frequency translation
iAnd inductance L
j, obtain coaxial line length respectively by (1) and (2).Select 2 SMA sockets for use, after debugging, use Hewlett-Packard Corporation's instrument, i.e. Sweep Source (8350B), network analyzer (8756A) and plotter (7475A), test result is as follows:
Passband (MH
Z) pass-band loss (dB) passband standing wave 30dB frequency (MH
Z)
1100-2000 0.21 1.2 530
2100-4000 0.21 1.3 780
First embodiment is applicable to 1-2GH
ZFrequency range, test result are Fig. 6 and shown in Figure 7.Fig. 6 represents the result of loss with frequency change.At 1.1-2.0GH
ZIn the scope.The loss representative value is less than 0.2dB.When frequency is lower than 530MH
ZThe time, its loss value is all greater than 30dB.Fig. 7 represents the result of return loss with frequency change, when being converted into voltage standing wave ratio, in the passband all less than 1.2.
Second example executed and is applicable to 2-4GH
ZFrequency range, test result such as Fig. 8 and shown in Figure 9.As can be seen from Figure 8, at 2.1-4.0GH
ZIn the passband, the representative value of loss is less than 0.2dB.When frequency is lower than 780MH
ZThe time, loss is all greater than 30dB.As can be seen from Figure 9, the voltage standing wave ratio in passband is less than 1.3.
In the ordinate of Fig. 6 and Fig. 8, for curve 1, every lattice are represented 10dB, and the then every lattice of curve 2 are represented 0.1dB.In Fig. 7 and Fig. 9, the every lattice of ordinate are represented 5dB.
Claims (1)
1, a kind of low-loss broadband high-pass filter is characterized in that:
(1), cavity is made up of two blocks of metal derbies, is screwed together, there is a through hole at the place at the metal derby interface, has several through holes to link to each other therewith in one of them metal derby,
(2), the center conductor of coaxial transmission line is formed by plurality of sections metallic conductor serial connection, section is hanged down the open circuit coaxial line of characteristic impedance with the place's of the serial connection formation between the section, realize series capacitance, fill with the hat medium socket between each open circuit coaxial line inner and outer conductor, the two ends of center conductor link to each other with the center conductor of joint
(3), between each section of coaxial transmission line center conductor, be connected to the center conductor of high characteristic impedance ridge axis, and between this ridge axis inner and outer conductor, movably short-circuit plunger is installed, constitute shunt inductance,
(4), ridge each section of axle transmission line interior diameter equates, overall diameter equates,
(5), respectively the ridge axis interior diameter of opening a way equates that overall diameter is equal,
(6), each shunt inductance short-circuit coaxial line is vertical with coaxial transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88218875 CN2059532U (en) | 1988-08-27 | 1988-08-27 | Low-loss, wide-band and high-pass wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88218875 CN2059532U (en) | 1988-08-27 | 1988-08-27 | Low-loss, wide-band and high-pass wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2059532U true CN2059532U (en) | 1990-07-18 |
Family
ID=4851274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88218875 Withdrawn CN2059532U (en) | 1988-08-27 | 1988-08-27 | Low-loss, wide-band and high-pass wave filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2059532U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207638A (en) * | 2015-11-11 | 2015-12-30 | 中国科学院国家天文台 | Ultra-low-loss microstrip high-pass filter with coaxial-line inductors |
| CN107004933A (en) * | 2014-12-31 | 2017-08-01 | 深圳市大富科技股份有限公司 | Cavity body filter and its installation method |
| CN110011011A (en) * | 2019-05-06 | 2019-07-12 | 中国工程物理研究院电子工程研究所 | A kind of high-field mode filter for only depositing TM mode |
-
1988
- 1988-08-27 CN CN 88218875 patent/CN2059532U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107004933A (en) * | 2014-12-31 | 2017-08-01 | 深圳市大富科技股份有限公司 | Cavity body filter and its installation method |
| CN107004933B (en) * | 2014-12-31 | 2019-06-11 | 深圳市大富科技股份有限公司 | Cavity body filter and its installation method |
| CN105207638A (en) * | 2015-11-11 | 2015-12-30 | 中国科学院国家天文台 | Ultra-low-loss microstrip high-pass filter with coaxial-line inductors |
| CN105207638B (en) * | 2015-11-11 | 2017-08-29 | 中国科学院国家天文台 | A kind of ultra-low loss coaxial line inductance micro-strip high-pass filter |
| CN110011011A (en) * | 2019-05-06 | 2019-07-12 | 中国工程物理研究院电子工程研究所 | A kind of high-field mode filter for only depositing TM mode |
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|---|---|---|---|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Applicant: Zhao Qingming Document name: Correction notice |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |