CN101471473A - Cross coupling structure of filter - Google Patents
Cross coupling structure of filter Download PDFInfo
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- CN101471473A CN101471473A CNA2007101733372A CN200710173337A CN101471473A CN 101471473 A CN101471473 A CN 101471473A CN A2007101733372 A CNA2007101733372 A CN A2007101733372A CN 200710173337 A CN200710173337 A CN 200710173337A CN 101471473 A CN101471473 A CN 101471473A
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- cross coupling
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Abstract
The invention provides a filter cross coupling structure, which comprises a filter cavity body, four waveguide resonant cavities arranged on the cavity body in an annular form and sequentially communicated with each other through windows, and a capacitive resonant column arranged between the first resonant cavity and the fourth resonant cavity for achieving cross coupling. Compared with the prior art, the filter cross-coupling structure can generate two inhibition points by one cross coupling, and particularly suits millimeter-wave filters.
Description
Technical field
The present invention relates to the filter in the field of wireless communication, particularly a kind of cross coupling structure of filter.
Background technology
Microwave is meant frequency, and (1MHz=1.0 * 10E6Hz) is to the 300GHz (signal of frequency range of 1GHz=1.0 * 10E9Hz) between 300MHz.Microwave communication originates from the Radar Technology that grows up in the World War II, be widely used at present telecommunications network all over the world, because the transmission that its bandwidth, capacity be big, can be used for various telecommunication services, as phone, telegram, data, fax and color TV etc., its occupation rate in network sets up is the gesture of quickening rising.Therefore, the research of microwave communication is to developing national economy and satisfying social needs significant.
The most basic microwave telecommunication system is to set up a microwave communication to connect between two microwave stations.Mainly comprise three parts on each microwave station structure: digital modems, radio-frequency front-end and antenna.Wherein modulator-demodulator is used for subscriber signal is modulated into radiofrequency signal (300KHz-300MHz); Radio-frequency front-end carries the modulated radiofrequency signal that makes to microwave or millimeter wave frequency band and to be amplified to power be about 1w; And passive parabolic shape antenna is used to transmit and receive these microwave signals.Duplexer is the key element in the radio-frequency front-end, its function is to make the microwave signal that transmits and receives not have with minimum loss to pass through simultaneously with influencing each other, also will effectively suppress the influence of other noise signal to system, the quality of its electrical property will be directly connected to the signal transmission quality of whole microwave telecommunication system.Microwave system below 6GHz adopts the coaxial type duplexer mostly, then waveguide type duplexers that adopt more than the 6GHz more.
Waveguide is meant the hollow metal tube that the endless of various cross sectional shapes is straight, the medium situation of filling does not all change along tube axial direction in the structural material of its cross sectional shape and size, tube wall and the pipe, and it is limited in the metal tube electromagnetic wave that is directed fully along its axial propagation.It is applicable to the signal of transmission 3-300GHz frequency range, characteristics are that conductor losses and dielectric loss are little, power capacity is big, radiationless loss and simple in structure, be easy to make.The rectangular waveguide duplexer is made up of the series of rectangular waveguide resonant cavity basically, forms inductive coupledly between the adjacent chamber by window, and this duplexer is generally adopted because of its workability.
Nervous and save reason such as power owing to frequency resource, require waveguide filter that little Insertion Loss, big band degree of inhibition outward will be arranged, in most cases adopt cross-linked method to realize the requirement of index.Cross-couplings comprises two kinds of capacitive character and inductive, wherein the inductive cross-couplings links to each other with filter cavity, realize easily, and the capacitive character cross-couplings often is not easy to realize, (100MHz---3000MHz), people realize the capacitive character cross-couplings through coupling copper wire commonly used or copper rod, but have arrived the millimeter waveguide filter frequencies when frequency is lower, copper wire and copper rod just are not easy to have realized because size is too big with respect to waveguide resonant cavity.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of cross coupling structure of filter for the defective that overcomes above-mentioned prior art existence.
Purpose technical scheme of the present invention is: a kind of cross coupling structure of filter, comprise filter cavity, on cavity, be provided with four waveguide resonant cavities of arranging and being communicated with by window in proper order ringwise, be characterized in, between first resonant cavity and the 4th resonant cavity, be provided with and be used to realize cross-linked capacitive character resonance post.
Described capacitive character resonance post is cylindric, directly processes on cavity.
The bottom section of described capacitive character resonance post endoporus is V-shaped.
The interior hole depth of described capacitive character resonance post is according to the strong and weak design of capacitive coupling.
Compared with prior art, the present invention has the following advantages:
1. do not need to use copper wire or copper rod to realize the capacitive character cross-couplings.
2. stable performance, reliable, high conformity.
Cost low, be easy to make.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation (B-B of Fig. 1 is to cutaway view) of the capacitive character resonance post among the present invention;
Fig. 3 is the debugging mode schematic diagram of the capacitive character resonance post among the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 2, cross coupling structure of filter of the present invention, comprise filter cavity 1, on cavity, be provided with four and arrange ringwise and waveguide resonant cavities 11,12,13,14 that order is communicated with by window, between first resonant cavity 11 and the 4th resonant cavity 14, be provided with and be used to realize cross-linked capacitive character resonance post 2.This capacitive character resonance post is cylindric, directly processes on cavity, and its endoporus generally gets out with drill bit, and bottom section 21 is V-shaped, and interior hole depth is according to the strong and weak design of capacitive coupling.
Above capacitor resonance post 2, place a cross-couplings adjustment screw 3 during the practical filter debugging, as shown in Figure 3, these adjustment screw 3 general brass materials and silver-plated that use, and use nut 4 fastening.Can screw out the size of the required electric capacity of fine adjustments by the screw-in of screw.When cross-couplings adjustment screw 3 screwed in capacitive character resonance post 2, capacitance reduced, and two inhibition point frequencies are away from filter passband; When cross-couplings screw 3 screwed out capacitive character resonance post 2, capacitance strengthened, and two inhibition point frequencies can more close filter passband.
Claims (4)
1. cross coupling structure of filter, comprise filter cavity, on cavity, be provided with four arrange ringwise and order by the waveguide resonant cavities that window is communicated with, it is characterized in that: between first resonant cavity and the 4th resonant cavity, be provided with and be used to realize cross-linked capacitive character resonance post.
2. cross coupling structure of filter according to claim 1 is characterized in that: described capacitive character resonance post is cylindric, directly processes on cavity.
3. a kind of cross coupling structure of filter according to claim 1 is characterized in that: the bottom section of described capacitive character resonance post endoporus is V-shaped.
4. a kind of cross coupling structure of filter according to claim 1 is characterized in that: the interior hole depth of described capacitive character resonance post is according to the strong and weak design of capacitive coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101733372A CN101471473A (en) | 2007-12-27 | 2007-12-27 | Cross coupling structure of filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101733372A CN101471473A (en) | 2007-12-27 | 2007-12-27 | Cross coupling structure of filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101471473A true CN101471473A (en) | 2009-07-01 |
Family
ID=40828697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101733372A Pending CN101471473A (en) | 2007-12-27 | 2007-12-27 | Cross coupling structure of filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101471473A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767018A (en) * | 2015-03-10 | 2015-07-08 | 江苏贝孚德通讯科技股份有限公司 | Filter with adjustable capacitive transmission zeros |
| CN109494437A (en) * | 2018-12-28 | 2019-03-19 | 南京信息工程大学 | Based on cross-coupling and source-load coupling quasi- elliptical waveguide filter of W-waveband |
-
2007
- 2007-12-27 CN CNA2007101733372A patent/CN101471473A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767018A (en) * | 2015-03-10 | 2015-07-08 | 江苏贝孚德通讯科技股份有限公司 | Filter with adjustable capacitive transmission zeros |
| CN109494437A (en) * | 2018-12-28 | 2019-03-19 | 南京信息工程大学 | Based on cross-coupling and source-load coupling quasi- elliptical waveguide filter of W-waveband |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090701 |