CN205609711U - Filter - Google Patents
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- CN205609711U CN205609711U CN201521030389.0U CN201521030389U CN205609711U CN 205609711 U CN205609711 U CN 205609711U CN 201521030389 U CN201521030389 U CN 201521030389U CN 205609711 U CN205609711 U CN 205609711U
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Abstract
The utility model discloses a filter, it is including three cross microstrip resonance unit, three cross microstrip resonance unit series connection coupling, wherein, it is three cross microstrip resonance unit is first microstrip resonance unit, second microstrip resonance unit, third microstrip resonance unit respectively, second microstrip resonance unit is located first microstrip resonance unit with in the middle of the third microstrip resonance unit, wherein, after the second microstrip resonance unit upset respectively with first microstrip resonance unit with the coupling of third microstrip resonance unit. Through the utility model discloses can overcome ku wave band receiver (LNB) image rejection's problem to the miniaturization of the equipment of can realizing.
Description
Technical field
This utility model belongs to VSAT application, relates to the image-rejection filter of LNB, particularly to the image-rejection filter being particularly suitable for Ku frequency range LNB.
Background technology
Ku band reception device (LNB) is a ground satellite communication equipment, and its function is the communication between satellite and the earth station realizing Ku frequency range.LNB has the feature such as ultra-low noise, volume is little, gain is high, high frequency stability.Ku band reception device (LNB) and Ku wave band emitter (BUC) composition radio frequency outdoor unit (ODU), then with antenna feeder part and and indoor unit (IDU) together constitute complete Ku band satellite transceiver.
In many RF indexes of Ku band reception device (LNB), relatively more crucial index is noise coefficient, gain, phase noise, frequency stability and spuious；For Ku band reception device (LNB), its intermediate frequency and rf frequency are according to specified by IEEE and FCC relevant criterion, can not arbitrarily select, so inside its spuious index, what image frequency was brought spuious unavoidably needs to suppress by use image frequency rejection mixer and high performance filter, and the received passband of image frequency distance LNB is close, so, high-performance, low cost wave filter meaning the most increasingly important.
Utility model content
This utility model solves problem for solving at least one technology above-mentioned, and provides at least one advantage following:
On the one hand, this utility model provides a kind of wave filter, by using this wave filter, can overcome the problem that Ku band reception device (LNB) image frequency suppresses.
On the other hand, this utility model provides a kind of wave filter, use this wave filter can only use three resonant element series connection to be achieved that the highest image frequency suppression function, there is the feature of low cost and small compact, between performance and volume cost, well achieve balance.
Another further aspect, what this utility model additionally provided a kind of wave filter is arranged aspect, can be arranged the wave filter with above-mentioned advantage by this aspect.
For solving above-mentioned technical problem, on the one hand this utility model provides a kind of wave filter, including three cross micro-band resonance units, described three cross micro-band resonance unit series coupled.
Further, input and/or the outfan of described wave filter is configured with double Coupled Miccrostrip Lines.
Further, three described cross micro-band resonance units are respectively the first micro-band resonance unit, the second micro-band resonance unit, the 3rd micro-band resonance unit, described second micro-band resonance unit is positioned in the middle of described first micro-band resonance unit and described 3rd micro-band resonance unit, wherein, couple with described first micro-band resonance unit and described 3rd micro-band resonance unit respectively after described second micro-band resonance unit upset.
Further, described second micro-band resonance unit is coupling with the first order and the third level after the vertical direction upset of transmission direction, and coupled modes are the double flat row microstrip line along signal transmission direction.
Further, described cross micro-band resonance unit is provided with two resonance arms in the plane vertical with described signal transmission direction.
Further, a resonance arm in two described resonance arms presents capacitive character to mid frequency, and another resonance arm presents inductive to mid frequency.
Further, the length of two described resonance arms is respectively the quarter-wave of outer nearest two the transmission zero correspondence frequencies of filter passband, and wherein, described wave filter is X-band wave filter.
By using technical solutions of the utility model, structurally can realize image frequency by the series connection of three resonant elements to suppress, simultaneously relative to cavity body filter or the microstrip filter of high-order being generally used for the suppression of LNB image frequency, reduce wave filter size, make filter construction the compactest, and reduce cost.
Accompanying drawing explanation
Fig. 1 is this utility model embodiment filter topologies schematic diagram；
Fig. 2 is this utility model embodiment filter setting method schematic diagram；
Fig. 3 is this utility model embodiment wave filter application circuit connection diagram at LNB；
Fig. 4 is this utility model embodiment wave filter simulation result schematic diagram.
Detailed description of the invention
Below in conjunction with detailed description of the invention, this utility model is described in further detail.But this should not being interpreted as, the scope of the above-mentioned theme of this utility model is only limitted to following enforcement:
Fig. 1 is this utility model embodiment filter topologies schematic diagram.
With reference to Fig. 1, in the wave filter shown in this utility model embodiment, use the structure being made up of 3 micro-band resonance units, these 3 micro-band resonance unit equal position cross-shaped configuration.On connecting, these 3 cross micro-band resonance units use cascade.
Further, utilizing on above-mentioned cross micro-band resonance unit wave filter in series, at least one in its input and outfan, configurable double Coupled Miccrostrip Lines.
Preferably, refer to embodiment as utility model one, when realizing, if 3 cross micro-band resonance units are respectively designated as the first micro-band resonance unit, the second micro-band resonance unit, the 3rd micro-band resonance unit.Then when connecting this 3 micro-band resonance units, if the first micro-band resonance unit and the first micro-band resonance unit lay respectively at the two ends of cascaded structure, second micro-band resonance unit is positioned at series connection and is positioned at the centre of cascaded structure, is i.e. positioned in the middle of the first micro-band resonance unit and described 3rd micro-band resonance unit.When utilizing the second micro-band resonance unit to connect the one the second micro-band resonance units, use the mode that will couple with described first micro-band resonance unit and described 3rd micro-band resonance unit respectively after the second micro-band resonance unit upset, thus complete the series connection of 3 the second micro-band resonance lists.
Above-mentioned utilize the second micro-band resonance unit connect the first micro-band resonance unit and the 3rd micro-band resonance unit structure in, a kind of alternate embodiment is, can coupled with first order micro-band resonance unit and third level micro-band resonance unit after the vertical direction upset of transmission direction by the second micro-band resonance unit, coupled modes are the double flat row microstrip line along signal transmission direction.
Further, in the wave filter of said structure, on cross micro-band resonance unit, in the plane vertical with signal transmission direction, it is provided with two resonance arms.
Arranging at the resonance arm of concrete micro-band resonance unit, a resonance arm in two resonance arms presents capacitive character to mid frequency, and another resonance arm presents inductive to mid frequency.
With further reference to Fig. 1, at the two ends of the wave filter shown in Fig. 1, assembly 101 and 106 is the double Coupled Miccrostrip Lines being configured at input and outfan, and in a kind of attainable embodiment, this microstrip line selects 50 ohm microstrip coupling lines.Further, first micro-band resonance unit and the resonance arm of the 3rd micro-band resonance unit are being respectively for assembly 102 and 105, on the one hand, insertion loss and the standing wave performance of wave filter can be regulated by the lateral separation of regulation resonance arm 102 and 105 and parallel length, on the other hand, for working in the wave filter of X-band, the transmission zero location outside X-band passage and mid frequency can be realized by regulation resonance arm 102 and 105.And the parallel lines crossing length of resonance arm 102,105 and 104 can adjust passband fluctuation and loss characteristic, filter insertion loss can be regulated by the spacing of regulation resonance arm 103 and wave filter.
Fig. 2 is this utility model embodiment filter setting method schematic diagram.
With reference to Fig. 2, in step 201,3 the cross micro-band resonance units selected are carried out series coupled.
In this utility model embodiment, the second micro-band resonance unit can be overturn when series connection, then, the two ends of this second micro-band resonance unit is being connected respectively and the first micro-band resonance unit and the 3rd micro-band resonance unit.For the numbering of aforementioned first, second, third, it is referred to embodiment illustrated in fig. 1, by named for the cross micro-band resonance unit of a section the first micro-band resonance unit, named 3rd micro-band resonance unit of cross resonant element of the other end, the micro-band resonance unit being positioned at centre is the second micro-band resonance unit.
In the above-described embodiments, the second micro-band resonance unit after upset refers to shown in Fig. 1, is in different sides through two resonance arms and the first, the 3rd micro-band resonance unit overturning its two ends.
In step 202, in 3 cross micro-band resonance units after concatenation, respectively at two ends, i.e. first micro-band resonance unit and one end of the 3rd micro-band resonance unit, double flat row microstrip line is set, it is configured with input and the outfan of first or the 3rd one end of micro-band resonance unit of double flat row microstrip line, respectively wave filter.
With reference to above-described embodiment, can be selected for 50 ohm microstrip coupling lines as double flat row microstrip line.Further, for the resonance arm of configuration on above-mentioned 3 micro-band resonance units, each resonance arm and the co-planar being perpendicular to signal transmission direction, wherein, for in two resonance arms that 1 micro-band resonance unit is configured, one resonance arm presents capacitive character to mid frequency, and another resonance arm presents inductive to mid frequency.
Fig. 3 is this utility model embodiment wave filter application circuit connection diagram at LNB.
Fig. 4 is this utility model embodiment wave filter simulation result schematic diagram.
With reference to Fig. 3, the LNB wave filter will recorded through above-described embodiment, connect in the circuit shown in Fig. 3.This circuit includes that wave filter described in low-noise amplifier, the present embodiment, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier form.
Receiving signal to amplify through 2 grades of low-noise amplifiers, after the present embodiment wave filter filters image frequency and local oscillator leakage, input mixer carries out down coversion, and intermediate-freuqncy signal exports LNB after intermediate frequency filtering and intermediate frequency amplify and receives two radio frequency bands.In the present embodiment, this wave filter works in X frequency range, in the LNB wave filter constructed, Ku frequency range LNB has two fixing local vibration sources, a corresponding reception frequency range is 10.7GHz-11.7GHz, intermediate frequency requires to be 0.95GHz-1.95GHz, and local frequency should be 9.75GHz, and corresponding image frequency is 7.8GHz-8.8GHz；It is 11.7GHz-12.75GHz that another one receives frequency range, it is 1.1GHz-2.15GHz that intermediate frequency requires, local oscillator should be 10.6GHz, corresponding image frequency then 8.45GHz-9.5GHz, it requires that filter passband is 10.7GHz-12.75GHz, the frequency band needing suppression is 7.8GHz-9.75GHz.
With further reference to Fig. 4, at the simulation result figure of wave filter used by the LNB of Ku wave band, passband is 10.7GHz-12.75GHz as we can see from the figure, insertion loss is less than 2dB, the frequency band needing suppression is 7.8GHz-9.75GHz, and degree of suppression is more than 40dB, can meet index very well.
Although having been described for the preferred embodiment of the application, but one of ordinary skilled in the art once knows basic creative concept, then these embodiments can be made other change and amendment.So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the application scope.
Obviously, those skilled in the art can carry out various change and modification without deviating from spirit and scope to the application.So, if these amendments of the application and modification belong within the scope of the application claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (6)
1. a wave filter, it is characterised in that include three cross micro-band resonance units, three described cross micro-band resonance unit series coupled；Wherein, three described cross micro-band resonance units are respectively the first micro-band resonance unit, the second micro-band resonance unit, the 3rd micro-band resonance unit, described second micro-band resonance unit is positioned in the middle of described first micro-band resonance unit and described 3rd micro-band resonance unit, wherein, couple with described first micro-band resonance unit and described 3rd micro-band resonance unit respectively after described second micro-band resonance unit upset.
2. wave filter as claimed in claim 1, it is characterised in that the input of described wave filter and/or outfan are configured with double Coupled Miccrostrip Lines.
3. wave filter as claimed in claim 1 or 2, it is characterised in that described second micro-band resonance unit is coupling with the first order and the third level after the vertical direction upset of transmission direction, and coupled modes are the double flat row microstrip line along signal transmission direction.
4. wave filter as claimed in claim 3, its feature is, described cross micro-band resonance unit is provided with two resonance arms in the plane vertical with described signal transmission direction.
5. wave filter as claimed in claim 4 a, it is characterised in that resonance arm in two described resonance arms presents capacitive character to mid frequency, and another resonance arm presents inductive to mid frequency.
6. wave filter as claimed in claim 5, it is characterised in that the length of two described resonance arms is respectively the quarter-wave of outer nearest two the transmission zero correspondence frequencies of filter passband, and wherein, described wave filter is X-band wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521030389.0U CN205609711U (en) | 2015-12-11 | 2015-12-11 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521030389.0U CN205609711U (en) | 2015-12-11 | 2015-12-11 | Filter |
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| Publication Number | Publication Date |
|---|---|
| CN205609711U true CN205609711U (en) | 2016-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521030389.0U Expired - Fee Related CN205609711U (en) | 2015-12-11 | 2015-12-11 | Filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342186A (en) * | 2020-03-05 | 2020-06-26 | 东北大学秦皇岛分校 | Cross-shaped coupling resonator |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342186A (en) * | 2020-03-05 | 2020-06-26 | 东北大学秦皇岛分校 | Cross-shaped coupling resonator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160928 Termination date: 20191211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |