CN102255122A - Band elimination filter and base station equipment - Google Patents
Band elimination filter and base station equipment Download PDFInfo
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- CN102255122A CN102255122A CN2011101053873A CN201110105387A CN102255122A CN 102255122 A CN102255122 A CN 102255122A CN 2011101053873 A CN2011101053873 A CN 2011101053873A CN 201110105387 A CN201110105387 A CN 201110105387A CN 102255122 A CN102255122 A CN 102255122A
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- microstrip line
- signal transmission
- coupled
- stop filter
- band stop
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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Abstract
The invention provides a band elimination filter and base station equipment. The band elimination filter comprises a dielectric slab, a signal transmission microstrip line, a coupled microstrip line and a grounded metal layer, wherein the dielectric slab is provided with a first surface and a second surface which are opposite to each other; the signal transmission microstrip line is arranged on the first surface, and is used for transmitting signals; the coupled microstrip line is arranged on the second surface, and is at least partially spatially overlapped with the signal transmission microstrip line; the grounded metal layer is arranged on the second surface, and is connected with the coupled microstrip line; and when transmitting the signals, the signal transmission microstrip line and the coupled microstrip line are coupled by the dielectric slab. The band elimination filter provided by the invention can filter high-power signals, and has a low size and low production cost.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of band stop filter and base station equipment.
Background technology
In the face of present fierce competitive market, the performance of base station product just is the principal focal point of competing in the industry, and power amplifier is as the important component part of base station, and direct relation quality and the communication efficiency that transmits.The most important index of power amplifier is exactly linearity and efficient, these two indexs are again conflicting, pursuing the high efficiency high linearity that realizes simultaneously, only rely on the performance of power amplifier itself to be difficult to satisfy, need assist realization by specific band stop filter.
In the prior art, more common band stop filter mainly is to realize by microstrip coupled structure, is that example describes with the band stop filter among Fig. 1.Band stop filter among Fig. 1 mainly is made up of signal transmission microstrip line 101 and coupled microstrip line 102, signal transmission microstrip line 101 and coupled microstrip line 102 all are arranged at the top layer of printed circuit board (PCB) (PCB), wherein, coupled microstrip line 102 ground connection are provided with, when signal transmission microstrip line 101 transmission signals, coupling can take place in signal transmission microstrip line 101 and coupled microstrip line 102, the inductance that coupling capacitance that produces and coupled microstrip line 102 self produce can equivalence be electric capacity (C) inductance (L) series resonant circuit among Fig. 2, reaches the purpose to the set specific frequency signal filtering.
As can be seen from Figure 1, need to have certain distance between signal transmission microstrip line 101 and the coupled microstrip line 102, this distance is that the parameters such as frequency according to the signal of want filtering determine that this distance can not be too big, otherwise can't realize filter effect.Distance between two microstrip lines is less, and when needing the power of signal of transmission big, between two microstrip lines spark phenomenon may take place, thereby can cause microstrip line to burn out.
Also have another band stop filter in the prior art, it is to realize that by the equivalent LC of little band (inductance capacitance) network this kind band stop filter can satisfy more powerful signal, but its size is wanted big several times, and production cost is higher.
Summary of the invention
In view of this, the invention provides a kind of band stop filter and base station equipment, can carry out filtering high-power signal, and size little, be easy to realize that production cost is low.
For addressing the above problem, the invention provides a kind of band stop filter, comprising: dielectric-slab has opposite first and second surface; Signal transmission microstrip line is arranged on the described first surface, is used for transmission signals; Coupled microstrip line is arranged on the described second surface, spatially overlaps at least with described signal transmission microstrip line; Ground metal layer is arranged on the described second surface, is connected with described coupled microstrip line; Wherein, when described signal transmitted the microstrip line transmission signals, described signal transmission microstrip line and described coupled microstrip line were by described dielectric-slab generation coupling.
Preferably, described signal transmission microstrip line comprises: first microstrip line, spatially overlap at least with described coupled microstrip line, and be used for and described coupled microstrip line generation coupling; Second microstrip line is arranged at the described first microstrip line both sides, is used to adjust the impedance of described signal transmission microstrip line, realizes impedance matching.
Preferably, the minimum widith of described second microstrip line is limited by the watt level of the signal that described signal transmission microstrip line need transmit.
Preferably, described coupled microstrip line comprises: the 3rd microstrip line, spatially overlap at least with described first microstrip line, and be used for and the described first microstrip line generation coupling; The 4th microstrip line is used to connect described the 3rd microstrip line and described ground metal layer.
Preferably, described first microstrip line is identical and spatially overlapping fully with the shape of described the 3rd microstrip line.
The present invention also provides a kind of base station equipment, comprises a band stop filter, and described band stop filter comprises: dielectric-slab has opposite first and second surface; Signal transmission microstrip line is arranged on the described first surface, is used for transmission signals; Coupled microstrip line is arranged on the described second surface, with
Described signal transmission microstrip line is spatially overlapped at least; Ground metal layer is arranged on the described second surface, is connected with described coupled microstrip line; Wherein, when described signal transmitted the microstrip line transmission signals, described signal transmission microstrip line and described coupled microstrip line were by described dielectric-slab generation coupling.
Preferably, described signal transmission microstrip line comprises: first microstrip line, spatially overlap at least with described coupled microstrip line, and be used for and described coupled microstrip line generation coupling; Second microstrip line is arranged at the described first microstrip line both sides, is used to adjust the impedance of described signal transmission microstrip line, realizes impedance matching.
Preferably, the minimum widith of described second microstrip line is limited by the watt level of the signal that described signal transmission microstrip line need transmit.
Preferably, described coupled microstrip line comprises: the 3rd microstrip line, spatially overlap at least with described first microstrip line, and be used for and the described first microstrip line generation coupling; The 4th microstrip line is used to connect described the 3rd microstrip line and described ground metal layer.
Preferably, described first microstrip line is identical and spatially overlapping fully with the shape of described the 3rd microstrip line.
The present invention has following beneficial effect:
Signal transmission microstrip line and coupled microstrip line on the band stop filter are coupled by the dielectric-slab that is positioned between the two, thereby can avoid taking place spark phenomenon, be applicable to high-power signal is carried out Filtering Processing.
Size is little, has saved production cost.
Be easy to realize that production process is simple.
Description of drawings
Fig. 1 is the electrical block diagram of band stop filter of the prior art;
Fig. 2 is the structural representation of lc circuit of the prior art;
Fig. 3 is an electrical block diagram of the first surface of band stop filter of the present invention;
Fig. 4 is the electrical block diagram on the second surface of band stop filter of the present invention;
Fig. 5 is another electrical block diagram on the first surface of band stop filter of the present invention;
Fig. 6 is another electrical block diagram on the second surface of band stop filter of the present invention;
Fig. 7 is the another electrical block diagram of the first surface of band stop filter of the present invention;
Fig. 8 is the another electrical block diagram on the second surface of band stop filter of the present invention;
Fig. 9 and Figure 10 are the performance simulation result schematic diagram of band stop filter of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Please refer to Fig. 3 and Fig. 4, the invention provides a kind of band stop filter, described band stop filter comprises: dielectric-slab 200, signal transmission microstrip line 300, coupled microstrip line 400 and ground metal layer 500, described dielectric-slab 200 has opposite first and second surface, be illustrated in figure 3 as an electrical block diagram of the first surface of described band stop filter, described signal transmission microstrip line 300 is arranged on the first surface of described dielectric-slab 200, be used for transmission signals, be illustrated in figure 4 as the electrical block diagram on the second surface of described band stop filter, described coupled microstrip line 400 is arranged on the second surface of described dielectric-slab 200, described coupled microstrip line 400 is spatially overlapped at least with described signal transmission microstrip line 300, described ground metal layer 500 is generally covers copper metal layer, also be arranged on the described second surface, and be connected with described coupled microstrip line 400.
Because described signal transmission microstrip line 300 is spatially overlapped at least with described coupled microstrip line 400, when described signal transmits microstrip line 300 transmission signals, described signal transmission microstrip line 300 can be by being arranged at dielectric-slab 200 couplings between the two with described coupled microstrip line 400, the inductance that coupling capacitance that produces and coupled microstrip line 400 self produce, can equivalence be a capacitor and inductor series resonant circuit, to filter the signal of characteristic frequency.
Owing to have dielectric-slab 200 between signal transmission microstrip line 300 and the coupled microstrip line 400, even therefore transmit powerful signal, spark phenomenon can not take place between signal transmission microstrip line 300 and the coupled microstrip line 400, improved the stability of band stop filter yet.
As can be seen from Figure 3, described signal transmission microstrip line 300 comprises: first microstrip line 301 and two second microstrip lines 302 that are positioned at the described first microstrip line both sides, wherein, first microstrip line 301 is spatially overlapped at least with described coupled microstrip line 400, is used for described coupled microstrip line 400 coupling taking place.The size of described first microstrip line 301 (length and width) needs the frequency (being the centre frequency of described band stop filter) of the signal of filtering and parameters such as the thickness decision of dielectric-slab by described band stop filter, can change as required, when the size of described first microstrip line 301 changes, the impedance of its described signal transmission microstrip line 300 also changes, described second microstrip line 302 promptly is the impedance that is used to adjust described signal transmission microstrip line 300, so that the impedance of described signal transmission microstrip line 300 returns to original resistance value, realize impedance matching.
As can be seen from Figure 4, described coupled microstrip line 400 comprises: the 3rd microstrip line 401 and the 4th microstrip line 402, wherein, described the 3rd microstrip line 401 is spatially overlapped at least with described first microstrip line 301, is used for described first microstrip line 301 coupling taking place.The size of described first microstrip line 301 also is to need the frequency of signal of filtering and parameters such as the thickness decision of dielectric-slab by described band stop filter, can change as required.The 4th microstrip line 402 is used to connect described the 3rd microstrip line 401 and described ground metal layer 500, and its effect is to be used to present certain inductance characteristic.
Described first microstrip line 301 can be an arbitrary shape, first microstrip line 301 among Fig. 3 be shaped as a rectangle, can certainly be other shapes, for example circle, triangle etc., Fig. 5 is another electrical block diagram on the first surface of band stop filter of the present invention, and wherein said first microstrip line 301 is a circle.
Described the 3rd microstrip line 401 can be an arbitrary shape, the 3rd microstrip line 401 among Fig. 4 be shaped as a rectangle, can certainly be other shapes, for example circle, triangle etc., Fig. 6 is another electrical block diagram on the second surface of band stop filter of the present invention, and wherein said the 3rd microstrip line 401 is a circle.
In addition, need to prove, described first microstrip line 301 can be the same or different with the shape of described the 3rd microstrip line 401, for example, described first microstrip line 301 can be a rectangle, described the 3rd microstrip line 401 can be a circle, has certain overlapping area as long as guarantee described first microstrip line 301 and described the 3rd microstrip line 401.Among the present invention, can be by the first surface of the described dielectric-slab 200 of change and the size of the microstrip line on the second surface, adjust the bandwidth and the centre frequency of band stop filter, overlapping part is big more, the capacitive of band stop filter is big more, and the 4th microstrip line 402 that is used for ground connection on the second surface mainly presents perception, by adjusting the size of described the 4th microstrip line 402, can adjust the position of centre frequency of band stop filter and bandwidth etc.Certainly, preferred in order to save the microstrip line on the band stop filter, described first microstrip line 301 and described the 3rd microstrip line 401 are can shape identical and spatially overlapping fully.
Requirement to the size of the microstrip line on the above-mentioned band stop filter is elaborated below.
Please refer to Fig. 7 and Fig. 8, Fig. 7 is the electrical block diagram on the first surface of band stop filter of the present invention, and Fig. 8 is the electrical block diagram on the second surface of band stop filter of the present invention.
At first need to prove; in PCB design; usually can on the dielectric-slab of not laying line, lay ground metal layer; see also ground metal layer 600 and ground metal layer 700 among Fig. 7; theoretically; ground metal layer 600 and ground metal layer 700 can not exert an influence to the course of work of the transmission of the signal among the present invention microstrip line; if but signal transmission microstrip line and ground metal layer distance are too near; when the power of the signal of transmission is big; between signal transmission microstrip line and the ground metal layer also spark phenomenon may take place; therefore, also need the distance between signal transmission microstrip line and the ground metal layer is suitably adjusted.
Among Fig. 7, the two ends of second microstrip line 302 also have a microstrip line 800 and microstrip line 900, described microstrip line 800 and described microstrip line 900 all are to be used for transmission signals, wherein, described microstrip line 800 is connected with parts to described band stop filter input signal, and described microstrip line 900 is connected with the parts of the signal that receives described band stop filter output.
The minimum widith of above-mentioned second microstrip line 302 is subjected to signal transmission microstrip line 300 to need signal power limited of transmission, and the width of described second microstrip line 302 is big more, and the power of the signal that can transmit is big more.
Following parameter among Fig. 7 and Fig. 8 is mainly determined by the centre frequency of described band stop filter: the length c of described first microstrip line 301, width h, first microstrip line 301 and insert between the metal level 600 apart from g, and between the ground metal layer 700 apart from f, width d, the length k of second microstrip line 302, the length b of the 3rd microstrip line 401, width l, width j, the n of described the 3rd microstrip line 401 left and right sides fluting, the width i of described the 3rd microstrip line 401 upsides fluting, width a, the length e of the 4th microstrip line 402.
It is very little that the size of the signal transmission microstrip line on the first surface of above-mentioned band stop filter can design, area can be about 0.5 square centimeter, when the frequency of the signal that needs filtering is high more, it is more little that the size of described microstrip line can design, for example reach 4GHZ when above when the frequency of the signal that needs filtering, the lap area of described signal transmission microstrip line and coupled microstrip line can be in 0.1 plane centimetre.
The production process of band stop filter of the present invention is very simple, on the first surface of band stop filter, signal transmission microstrip line only need be set get final product, and its shape is not limit.Owing to normally constitute on the second surface of band stop filter of the prior art by the ground metal layer of monoblock, among the present invention, only need on the ground metal layer on the second surface of band stop filter, dig up a part of metal (promptly forming fluting), just can form the coupled microstrip line that is independent of ground metal layer, inserting metal level is positioned at around the coupled microstrip line, separate by fluting and the coupled microstrip line that forms, in addition, in order to produce the capacitor and inductor feature, coupled microstrip line also is connected with ground metal layer by a thin microstrip line (being above-mentioned the 4th microstrip line 402).
The performance simulation result schematic diagram of the band stop filter among the above-mentioned Fig. 3 of Fig. 9 and Fig. 4, the performance simulation result schematic diagram of the band stop filter among the above-mentioned Fig. 5 of Figure 10 and Fig. 6, curve among Fig. 9 and Figure 10 is the amplitude-versus-frequency curve of band stop filter, just the gain of band stop filter is with the curve of frequency change, among Fig. 9 and Figure 10, abscissa is represented frequency, and unit is GHz (GHZ), ordinate is the amplitude fading amount of band stop filter, and unit is a decibel (dB).From simulation result as can be seen, Insertion Loss is less than 0.1dB in the band of band stop filter of the present invention, and in the bandwidth of nearly 200MHz, the target signal filter ability can reach-more than the 20dB.
The present invention also provides a kind of base station equipment, and described base station equipment comprises a band stop filter, and the structure of the band stop filter in described band stop filter and the foregoing description is identical, and comprising: dielectric-slab has opposite first and second surface; Signal transmission microstrip line is arranged on the described first surface, is used for transmission signals; Coupled microstrip line is arranged on the described second surface, spatially overlaps at least with described signal transmission microstrip line; Ground metal layer is arranged on the described second surface, is connected with described coupled microstrip line.Be provided with because described signal transmission microstrip line and described coupled microstrip line are folded, when described signal transmits the microstrip line transmission signals, coupling can take place by the dielectric-slab coupling that is arranged between the two in described signal transmission microstrip line and described coupled microstrip line, the inductance that coupling capacitance that produces and coupled microstrip line self produce, can equivalence be a capacitor and inductor series resonant circuit, to filter the signal of characteristic frequency.Owing to have dielectric-slab between signal transmission microstrip line and the coupled microstrip line, even therefore transmit powerful signal, spark phenomenon can not take place between signal transmission microstrip line and the coupled microstrip line yet, improved the stability of band stop filter.
Preferably, described signal transmission microstrip line can comprise: first microstrip line, spatially overlap at least with described coupled microstrip line, and be used for and described coupled microstrip line generation coupling; Second microstrip line is arranged at the described first microstrip line both sides, is used to adjust the impedance of described signal transmission microstrip line, realizes impedance matching.The minimum widith of described second microstrip line is limited by the size of the power of the signal that described signal transmission microstrip line need transmit.
Preferably, described coupled microstrip line can comprise: the 3rd microstrip line, spatially overlap at least with described first microstrip line, and be used for and the described first microstrip line generation coupling; The 4th microstrip line is used to connect described the 3rd microstrip line and described ground metal layer.
Described first microstrip line can be an arbitrary shape, for example rectangle, circle, triangle etc., described the 3rd microstrip line also can be an arbitrary shape, the shape of described first microstrip line and described the 3rd microstrip line can be the same or different, and has certain overlapping area as long as guarantee described first microstrip line and described the 3rd microstrip line.Among the present invention, can be by the first surface of change dielectric-slab and the size of the microstrip line on the second surface, adjust the bandwidth and the centre frequency of band stop filter, the capacitive of the big more band stop filter of overlapping part is big more, and the 4th microstrip line that is used for ground connection on the second surface mainly presents perception, by adjusting the size of the 4th microstrip line, can adjust the position of centre frequency of band stop filter and bandwidth etc.Certainly, preferred in order to save microstrip line, described first microstrip line and described the 3rd microstrip line are can shape identical and spatially overlapping fully.
Above-mentioned base station equipment can also comprise a power amplifier, and described band stop filter can be used as the device that power amplification N subharmonic suppresses, thereby improves the linearity of power amplification.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a band stop filter is characterized in that, comprising:
Dielectric-slab has opposite first and second surface;
Signal transmission microstrip line is arranged on the described first surface, is used for transmission signals;
Coupled microstrip line is arranged on the described second surface, spatially overlaps at least with described signal transmission microstrip line;
Ground metal layer is arranged on the described second surface, is connected with described coupled microstrip line;
Wherein, when described signal transmitted the microstrip line transmission signals, described signal transmission microstrip line and described coupled microstrip line were by described dielectric-slab generation coupling.
2. band stop filter as claimed in claim 1 is characterized in that, described signal transmission microstrip line comprises:
First microstrip line is spatially overlapped at least with described coupled microstrip line, is used for and described coupled microstrip line generation coupling;
Second microstrip line is arranged at the described first microstrip line both sides, is used to adjust the impedance of described signal transmission microstrip line, realizes impedance matching.
3. band stop filter as claimed in claim 2 is characterized in that, the minimum widith of described second microstrip line is limited by the watt level of the signal that described signal transmission microstrip line need transmit.
4. band stop filter as claimed in claim 2 is characterized in that, described coupled microstrip line comprises:
The 3rd microstrip line is spatially overlapped at least with described first microstrip line, is used for and the described first microstrip line generation coupling;
The 4th microstrip line is used to connect described the 3rd microstrip line and described ground metal layer.
5. band stop filter as claimed in claim 4 is characterized in that, described first microstrip line is identical and spatially overlapping fully with the shape of described the 3rd microstrip line.
6. a base station equipment comprises a band stop filter, it is characterized in that, described band stop filter comprises:
Dielectric-slab has opposite first and second surface;
Signal transmission microstrip line is arranged on the described first surface, is used for transmission signals;
Coupled microstrip line is arranged on the described second surface, spatially overlaps at least with described signal transmission microstrip line;
Ground metal layer is arranged on the described second surface, is connected with described coupled microstrip line;
Wherein, when described signal transmitted the microstrip line transmission signals, described signal transmission microstrip line and described coupled microstrip line were by described dielectric-slab generation coupling.
7. base station equipment as claimed in claim 6 is characterized in that, described signal transmission microstrip line comprises:
First microstrip line is spatially overlapped at least with described coupled microstrip line, is used for and described coupled microstrip line generation coupling;
Second microstrip line is arranged at the described first microstrip line both sides, is used to adjust the impedance of described signal transmission microstrip line, realizes impedance matching.
8. base station equipment as claimed in claim 7 is characterized in that, the minimum widith of described second microstrip line is limited by the watt level of the signal that described signal transmission microstrip line need transmit.
9. base station equipment as claimed in claim 7 is characterized in that, described coupled microstrip line comprises:
The 3rd microstrip line is spatially overlapped at least with described first microstrip line, is used for and the described first microstrip line generation coupling;
The 4th microstrip line is used to connect described the 3rd microstrip line and described ground metal layer.
10. base station equipment as claimed in claim 9 is characterized in that, described first microstrip line is identical and spatially overlapping fully with the shape of described the 3rd microstrip line.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110105387.3A CN102255122B (en) | 2011-04-26 | 2011-04-26 | Band elimination filter and base station equipment |
| PCT/CN2012/072832 WO2012146102A1 (en) | 2011-04-26 | 2012-03-22 | Band elimination filter and base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110105387.3A CN102255122B (en) | 2011-04-26 | 2011-04-26 | Band elimination filter and base station equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102255122A true CN102255122A (en) | 2011-11-23 |
| CN102255122B CN102255122B (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110105387.3A Expired - Fee Related CN102255122B (en) | 2011-04-26 | 2011-04-26 | Band elimination filter and base station equipment |
Country Status (2)
| Country | Link |
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| CN (1) | CN102255122B (en) |
| WO (1) | WO2012146102A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012146102A1 (en) * | 2011-04-26 | 2012-11-01 | 中兴通讯股份有限公司 | Band elimination filter and base station |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11613089B2 (en) * | 2020-01-16 | 2023-03-28 | Toray Industries, Inc. | Method for producing medical device |
| CN114628873B (en) * | 2022-03-09 | 2023-08-18 | 南通大学 | Absorption type microstrip line band elimination filter structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005099282A1 (en) * | 2004-04-09 | 2005-10-20 | Utstarcom Telecom Co., Ltd. | A method and system of signal transmission based on radio frequency stretch base station |
| CN201540940U (en) * | 2009-08-13 | 2010-08-04 | 中国计量学院 | Microwave band-pass filter with microstrip line structure |
| CN101950826A (en) * | 2010-09-01 | 2011-01-19 | 华东交通大学 | Square annular defected ground structure microwave dual-mode band-pass filter |
| CN101989672A (en) * | 2010-10-18 | 2011-03-23 | 华东交通大学 | Novel DGW band-pass filter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7310030B2 (en) * | 2005-09-06 | 2007-12-18 | National Taiwan University | Ring millimeter-wave filter having an embedded microstrip structure |
| CN101894995B (en) * | 2010-05-19 | 2013-07-24 | 华南理工大学 | Radio frequency electrically adjusted band-pass filter with constant absolute bandwidth |
| CN102255122B (en) * | 2011-04-26 | 2015-04-01 | 中兴通讯股份有限公司 | Band elimination filter and base station equipment |
-
2011
- 2011-04-26 CN CN201110105387.3A patent/CN102255122B/en not_active Expired - Fee Related
-
2012
- 2012-03-22 WO PCT/CN2012/072832 patent/WO2012146102A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005099282A1 (en) * | 2004-04-09 | 2005-10-20 | Utstarcom Telecom Co., Ltd. | A method and system of signal transmission based on radio frequency stretch base station |
| CN100544457C (en) * | 2004-04-09 | 2009-09-23 | Ut斯达康通讯有限公司 | The signal of base station transmission method and the system that zoom out based on radio frequency |
| CN201540940U (en) * | 2009-08-13 | 2010-08-04 | 中国计量学院 | Microwave band-pass filter with microstrip line structure |
| CN101950826A (en) * | 2010-09-01 | 2011-01-19 | 华东交通大学 | Square annular defected ground structure microwave dual-mode band-pass filter |
| CN101989672A (en) * | 2010-10-18 | 2011-03-23 | 华东交通大学 | Novel DGW band-pass filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012146102A1 (en) * | 2011-04-26 | 2012-11-01 | 中兴通讯股份有限公司 | Band elimination filter and base station |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012146102A1 (en) | 2012-11-01 |
| CN102255122B (en) | 2015-04-01 |
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Granted publication date: 20150401 Termination date: 20200426 |