CN102623776A - Coaxial cavity-based rejection filter - Google Patents
Coaxial cavity-based rejection filter Download PDFInfo
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- CN102623776A CN102623776A CN2012100741743A CN201210074174A CN102623776A CN 102623776 A CN102623776 A CN 102623776A CN 2012100741743 A CN2012100741743 A CN 2012100741743A CN 201210074174 A CN201210074174 A CN 201210074174A CN 102623776 A CN102623776 A CN 102623776A
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- transmission line
- inner wire
- main transmission
- inner conductor
- housing
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Abstract
The invention discloses a coaxial cavity-based rejection filter which comprises inner conductor resonance rods, an inner conductor main transmission line, support insulators, a housing, two N-type connectors and a metal cover, wherein both a U-shaped air cavity and a plurality of resonant cavities communicated with the air cavity are formed in the housing; each inner conductor resonance rod is in internally threaded rotary joint with the corresponding resonant cavity; the inner conductor main transmission line is arranged in the U-shaped air cavity; both the inner conductor resonance rods and the inner conductor main transmission line are supported and fixed by the support insulators; the inner cores of the two N-type connectors are respectively fixed with the two ports of the coaxial inner conductor main transmission line through solder; and the metal cover covers and is fixed with the housing. The rejection filter adopting a coaxial cavity design has high performance; and the transmission line can transmit TEM model, has the advantages of low passive intermodulation, large power capacity, good temperature characteristic and the like, and overcomes the shortcomings of other transmission lines such as large wastage and large size. The rejection filter is suitable for miniaturization design and manufacturing as well as engineering application.
Description
Technical field
The present invention relates to the mobile communication equipment technical field, relate in particular to a kind of high resistant attached cavity band stop filter based on the circular coaxial line.
Background technology
In many microwave systems, require signal to transmit therein, and unwanted noise, interference, requirement such as spuious are had the very high degree of decay with as far as possible little decay.For example the interference in certain frequency range is strong especially, and it passes through just must to take special measures to disinthibite.If at this moment take the broadband stopband of band pass filter to suppress unwanted frequency, just not as taking one or several band stop filter to suppress it more flexibly effectively.Some traditional band stop filters (like microstrip line or strip line band stop filter) because its power that can bear is lower, when the spurious signal of power amplifier or the generation of some nonlinear devices is passed through, just puncture easily.And can bear power ratio high Waveguide bandstop filter, at citizens' radio band (probably between 800MHz-2500MHz), device volume is bigger, does not utilize to be integrated in the practical applications.Yet the cavity coaxial band-rejection filter combines the advantage of these two kinds of devices, has that volume is little, to bear power big, advantages such as high stopband inhibition.
Summary of the invention
In order to overcome two kinds of band stop filters of microstrip line and waveguide for the high-power deficiency that can not take into account with miniaturization.The invention provides a kind of coaxial cavity band stop filter; This filter can not only bear the power about 100W; Volume little (maximal side is in 25cm) is convenient to the through engineering approaches application, and suppresses very high (reaching 80dB) in the band, can effectively suppress interference signal.
The objective of the invention is through realizing by technical scheme successively: a kind of band stop filter based on coaxial cavity, it comprises: inner wire resonant rod, inner wire main transmission line, supporting insulator, housing, two N Connectors and crown cap etc.; Wherein, have a U type air chamber and some resonant cavitys that communicates with U type air chamber in the said housing, spin an inner wire resonant rod and fix of each resonant cavity internal thread by nut; The inner wire main transmission line places in the U type air chamber, and inner wire resonant rod and inner wire main transmission line be by the supporting insulator fixed support, makes the top of inner wire resonant rod can not contact with housing with the inner wire main transmission line and causes short circuit; The inner core of two N Connectors is fixed through scolding tin with two ports of the inner wire main transmission line of coaxial line respectively; Crown cap covers on housing and fixes.
The invention has the beneficial effects as follows: the present invention adopts coaxial cavity design high-performance band stop filter; This transmission line TEM mould; Have not only that passive intermodulation is low, power capacity is big and advantage such as good temp characteristic; And overcome big, the bulky deficiency of other transmission line losses, be fit to miniaturization Design and manufacturing and practical applications.
Description of drawings
Fig. 1 is the cutaway view of band stop filter of the present invention;
Fig. 2 is the end view of inner wire main transmission line among Fig. 1;
Fig. 3 is an A-A cutaway view among Fig. 1;
Fig. 4 is vertical view, left and right sides view and the rearview of band stop filter of the present invention;
Fig. 5 is emulation and the measured result comparison diagram of embodiment;
Among the figure, inner wire resonant rod 1, inner wire main transmission line 2, supporting insulator 3, housing 4, adjusting screw 5, N Connector 6, screw 7, crown cap 8.
Embodiment
Like Fig. 1-shown in Figure 4, the band stop filter that the present invention is based on coaxial cavity comprises: inner wire resonant rod 1, inner wire main transmission line 2, supporting insulator 3, housing 4, nut 5, two N Connectors 6 and crown caps 8.Wherein, Have a U type air chamber and some resonant cavitys that communicates with U type air chamber in the housing 4; Each resonant cavity internal thread inner wire resonant rod 1 and fixing that spins by nut 5; Inner wire main transmission line 2 places in the U type air chamber, and inner wire resonant rod 1 and inner wire main transmission line 2 be by supporting insulator 3 fixed supports, makes the top of inner wire resonant rod 1 can not contact with housing 4 with inner wire main transmission line 2 and causes short circuit.The inner core of two N Connectors 6 is fixed through scolding tin with two ports of the inner wire main transmission line 2 of coaxial line respectively; Crown cap 8 covers on housing 4, and fixing by screw 7.
The chamber of resonant cavity is 1/4th resonance wavelengths deeply; Its cutaway view is as shown in Figure 3.The structure of inner wire main transmission line 2 is as shown in Figure 2, and the coaxial line characteristic impedance of two ports of inner wire main transmission line 2 is 50 Europe.
The course of work of the present invention is following: the signal of communication is an input in two N Connectors 6 from Fig. 4; Export from another one N Connector 6 inner chamber (comprising U type air chamber and some resonant cavitys that communicates with U type air chamber) back through whole band stop filter, accomplishes screening of signals.Structure among Fig. 1 is to be made up of 16 capacitive coupling branch lines of an inner wire main transmission line 2 parallel connections (being realized by resonant cavity and the inner wire resonant rod 1 that screws in it).Confirm the characteristic impedance of capacitive coupling branch line according to the actual conditions needs; Change the size of coupling capacitance again through the length of regulating inner wire resonant rod 1, and then regulate resonance frequency, form a complete rejector circuit; Suppress spurious signal, through needed signal.
Emulation of the present invention and measured result are as shown in Figure 5, and measured result and simulation result approach very much.In the stopband of 1980MHz, the emulation of embodiment and actual measurement transfer function curve s21 be all less than-80dB at 1920MHz for signal frequency, and approach very much.And echo function curve s11 all has in to 2.2GHz and 1700MHz to two ultra broadbands of 1910MHz at 1990MHz-return loss below the 15dB and-insertion loss more than the 2dB.Because technology and debugging error, the actual measurement and the emulation of the echo function curve of embodiment have certain error, but its measured result still satisfies the index request of design fully, and can make it approach simulation result through improving machining accuracy and debugging.
Claims (3)
1. the band stop filter based on coaxial cavity is characterized in that it comprises: inner wire resonant rod (1), inner wire main transmission line (2), supporting insulator (3), housing (4), two N Connectors (6) and crown cap (8) etc.; Wherein, have a U type air chamber and some resonant cavitys that communicates with U type air chamber in the said housing (4), each resonant cavity internal thread inner wire resonant rod 1 and fixing that spins by nut (5); Inner wire main transmission line (2) places in the U type air chamber; Inner wire resonant rod (1) and inner wire main transmission line (2) be by supporting insulator (3) fixed support, makes the top of inner wire resonant rod (1) can not contact with housing (4) with inner wire main transmission line (2) and cause short circuit; The inner core of two N Connectors (6) is fixed through scolding tin with two ports of the inner wire main transmission line (2) of coaxial line respectively; Crown cap (8) covers at housing (4) to be gone up and fixes.
2. according to the said band stop filter of claim 1, it is characterized in that the chamber of said resonant cavity is 24mm deeply based on coaxial cavity.
3. according to the said band stop filter of claim 1, it is characterized in that the coaxial line characteristic impedance of two ports of said inner wire main transmission line (2) is 50 Europe based on coaxial cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100741743A CN102623776A (en) | 2012-03-20 | 2012-03-20 | Coaxial cavity-based rejection filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100741743A CN102623776A (en) | 2012-03-20 | 2012-03-20 | Coaxial cavity-based rejection filter |
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| CN102623776A true CN102623776A (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100741743A Pending CN102623776A (en) | 2012-03-20 | 2012-03-20 | Coaxial cavity-based rejection filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070992A (en) * | 2015-08-19 | 2015-11-18 | 成都九洲迪飞科技有限责任公司 | Wide-bandpass stop-band filter |
| CN105914433A (en) * | 2016-05-05 | 2016-08-31 | 陈运涛 | Band-stop filter applied to broadband receiver |
| CN106571505A (en) * | 2016-06-26 | 2017-04-19 | 南京濠暻通讯科技有限公司 | Band-stop filter capable of eliminating interference between different service providers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754227Y (en) * | 2004-12-10 | 2006-01-25 | 深圳市微通科技有限公司 | Coaxial cavity semi-integrated total-parameter microwave band-stop filter |
| CN201134487Y (en) * | 2007-12-27 | 2008-10-15 | 奥雷通光通讯设备（上海）有限公司 | Band-elimination filter for WIMAX communication system |
| CN202550044U (en) * | 2012-03-20 | 2012-11-21 | 中国计量学院 | Band-stop filter based on coaxial cavities |
-
2012
- 2012-03-20 CN CN2012100741743A patent/CN102623776A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754227Y (en) * | 2004-12-10 | 2006-01-25 | 深圳市微通科技有限公司 | Coaxial cavity semi-integrated total-parameter microwave band-stop filter |
| CN201134487Y (en) * | 2007-12-27 | 2008-10-15 | 奥雷通光通讯设备（上海）有限公司 | Band-elimination filter for WIMAX communication system |
| CN202550044U (en) * | 2012-03-20 | 2012-11-21 | 中国计量学院 | Band-stop filter based on coaxial cavities |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070992A (en) * | 2015-08-19 | 2015-11-18 | 成都九洲迪飞科技有限责任公司 | Wide-bandpass stop-band filter |
| CN105914433A (en) * | 2016-05-05 | 2016-08-31 | 陈运涛 | Band-stop filter applied to broadband receiver |
| CN105914433B (en) * | 2016-05-05 | 2019-05-21 | 陈运涛 | A kind of bandstop filter applied to broadband receiver |
| CN106571505A (en) * | 2016-06-26 | 2017-04-19 | 南京濠暻通讯科技有限公司 | Band-stop filter capable of eliminating interference between different service providers |
| CN106571505B (en) * | 2016-06-26 | 2020-01-14 | 南京濠暻通讯科技有限公司 | Band elimination filter suitable for interference elimination between different operators |
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Application publication date: 20120801 |