CN2749064Y - Grating filter - Google Patents
Grating filter Download PDFInfo
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- CN2749064Y CN2749064Y CN 200420093130 CN200420093130U CN2749064Y CN 2749064 Y CN2749064 Y CN 2749064Y CN 200420093130 CN200420093130 CN 200420093130 CN 200420093130 U CN200420093130 U CN 200420093130U CN 2749064 Y CN2749064 Y CN 2749064Y
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- fence gate
- transmission line
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- gate formula
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Abstract
The utility model relates to a grating filter, which comprises a first order handshake resonance unit provided with the input end on the outside of the grating filter to receive and filter a signal; at least one intermediate coupling unit which is provided in the grating filter and connected with the first order handshake resonance unit parallelly to filter noise information in the signal; and a last order handshake resonance unit which is provided with the output end on the outside of the grating filter and connected with the intermediate coupling unit to filter signals after receiving the signals and transmit to the output end. The grating filter uses a handshake way to design the quarter-wave transmission line of the working frequency and a plurality of resonance cavities, comprising a circuit arrangement of the grating coplanar structure, and the circuit arrangement is formed by the handshake resonance unit and the intermediate coupling unit. The grating filter makes use of the effect of the electromagnetic resonance coupling of the quarter-wave transmission line and the resonance cavity for filtering purpose.
Description
Technical field
The utility model relates to a kind of fence gate formula filter (Fence-gate filter), particularly relate to a kind of satellite frequency demultiplier (Low Noise Block down-converter that is mainly used in, LNB) less radio-frequency (Radio-Frequency, RF) mirror filter of circuit (image filter).
Background technology
Because the fast development of wireless telecommunications makes the research and development of communication element obtain very big business opportunity,, all cast considerable manpower and material resources and improved the communication quality of existing system in recent years no matter be industrial circle or academia.Because people constantly increase the demand of wireless communication frequency band, thus in the modern microwave communication system, particularly satellite and Mobile Communications system, its emission and receiving terminal often need the usefulness of high efficiency narrow-band bandpass filter as channel selection.With regard to filter, high efficiency promptly is meant high selectivity (selectivity) and is inserted into loss (insertion loss).The filter of high selectivity is fairly good to the inhibition ability of other wavestrip (side band), can dwindle the buffer zone (guard band) between adjacent channel, and the situation that frequency is used is more efficient.Yet existing widely used passive device more or less all contains the composition of loss, often causes the consume of transmission signal power, and promptly so-called insertion loss is lost if can reduce this, and the lifting of communication system medium sensitivity is had suitable benefiting.
Yet, from the viewpoint of Design of Filter, high selectivity and be inserted into that loss normally runs in the opposite direction.In traditional method for designing, can be by the exponent number that increases filter, just the number of resonator (resonator) promotes its selectivity, but often but must sacrifice the performance of passband, because (Quality Factor) is limited for the quality factor of resonator, if the resonator that passes through in the transmission path is many more, the passband loss that then causes is big more.Hence one can see that, and passband performance interior and that passband is outer checks and balance in fact, makes us at the different size designing filter time, and the between of having to is done some choice.
This shows that above-mentioned existing filter obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that filter exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing filter exists, the design people is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of fence gate formula filter of new structure, can improve general existing filter, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the utility model that has practical value finally.
The utility model content
Main purpose of the present utility model is, overcome the defective that existing filter exists, and provide a kind of fence gate formula filter of new structure, technical problem to be solved is to make this fence gate formula filter can be applicable to the mirror filter of wireless radio frequency circuit in the satellite frequency demultiplier, it is the design of handing over the mode of holding with the quarter-wave transmission line of operating frequency and a plurality of resonant cavity, have input coupling preferably (input matching) and lower insertion loss, can make this filter be issued to lower passband loss in specific operating frequency, make quality factor improve, the situation that frequency is used is more efficient, and be applicable to mirror image filtering, thereby be suitable for practicality more.
Another purpose of the present utility model is, a kind of fence gate formula filter of new structure is provided, and technical problem to be solved is to make its fence gate formula circuit layout structure design with rule, makes processing procedure be very easy to, and has the extensive value on the industry.
A purpose more of the present utility model is, a kind of fence gate formula filter of new structure is provided, technical problem to be solved is in the time of as if need this fence gate formula Design of Filter being become high-order band-pass filters, only identical circuit partly need be duplicated adjacency, be very easy in design, and symmetry because of circuit, can reduce the time of design simulation, and can produce more limit at particular job frequency ripple passband, make the flatness of passband improve, and then can reach preferable filter effect, thereby be suitable for practicality more.
The purpose of this utility model and to solve its technical problem be to adopt following technical scheme to realize.According to a kind of fence gate formula filter that the utility model proposes, it is the design of handing over the mode of holding with quarter-wave transmission line and a plurality of resonant cavity of operating frequency, it comprises at least: the resonance unit is held in an elementary friendship, the input that the resonance unit is arranged at this fence gate formula filter outside is held in this elementary friendship, in order to receive behind the signal in addition filtering; At least one coupling unit in the middle of one, this centre coupling unit is arranged in this fence gate formula filter, and parallelly is connected in this elementary friendship and holds the resonance unit, and this centre coupling unit is in order to the noise in this signal of filtering; And one last rank hand over and hold the resonance unit, these rank, end are handed over and are held the resonance unit and be arranged at the output in this fence gate formula filter outside and connect this centre coupling unit, in order to receive behind this signal in addition filtering and to be sent to output.
The purpose of this utility model and solve its technical problem and can also be further achieved by the following technical measures.
Aforesaid fence gate formula filter, the resonance unit is held in wherein said elementary friendship and the resonance unit is held in the friendship of last rank, be quarter-wave transmission line, and the friendship that is designed to have at least one one quarter-wave resonant cavity hold mode, to produce the purpose of electromagentic resonance coupling with operating frequency.
The resonance unit held by aforesaid fence gate formula filter, wherein said elementary friendship and the resonance unit is held in the friendship of last rank, has more outward extending transmission line, constitutes the input and the output of this circuit respectively.
Aforesaid fence gate formula filter, wherein said middle coupling unit is the quarter-wave transmission line with operating frequency, and is designed to have at least one one quarter-wave resonant cavity, to produce the purpose of electromagentic resonance coupling.
Aforesaid fence gate formula filter, wherein said transmission line can be microstrip line, strip line, and all have the dielectric wire of signal transfer functions.
The utility model compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned utility model purpose, major technique of the present utility model thes contents are as follows:
The utility model proposes a kind of fence gate formula filter, this fence gate formula filter can be applicable to the mirror filter of wireless radio frequency circuit in the satellite frequency demultiplier, it is characterized in that the design of handing over the mode of holding with the quarter-wave transmission line of operating frequency and a plurality of resonant cavity, form circuit layout as fence gate formula copline framework, utilize the electromagentic resonance coupling of quarter-wave transmission line and resonant cavity, reach the purpose of filtering.Hand over the circuit design of holding because of adopt resonant cavity in the feed side, so input coupling preferably (input matching) is arranged, and lower insertion loss, can make this filter under specific operating frequency, reach lower passband loss, simultaneously can filtering nearer other wavestrip is also dwindled buffer zone between adjacent channel, produce comparatively precipitous decay, make quality factor improve, thereby have splendid outer frequency inhibition ability, the situation that frequency is used is more efficient, and is applicable to mirror image filtering.
Because of it is with the design of the fence gate formula circuit layout structure of rule, be the copline framework again, and do not need again extra ground connection, make that therefore processing procedure is very easy to, and have the extensive value on the industry.Simultaneously, in the time of if this fence gate formula Design of Filter need being become high-order band-pass filters, only identical circuit partly need be duplicated adjacency, therefore design is very easy to, and because of the symmetry of circuit, can reduce the time of design simulation, and can produce more limit at particular job frequency ripple passband, make the flatness of passband improve, and then can reach preferable filter effect.
Therefore, with existing traditional printed circuit microstripline filter (Printed Microstripfilter), as: finger-fork type filter (Interdigital filter), edge manifold type microstripline filter (Edge coupled Microstrip), hairpin-line bandpass filter (Hairpin filter) ... Deng comparing, the utility model fence gate formula filter has following advantage at least:
1, the utility model fence gate formula filter, its circuit layout symmetric design makes the circuit design simulated time reduce, and it is quite easy to use the band pass filter (greater than 3 rank) that this circuit symmetrical mode designs high-order.
2, the utility model fence gate formula filter, its feed side adopt resonant cavity to hand over and hold mode, so input coupling is preferably arranged, reach lower transmission loss, can reach high selectivity and be inserted into the high efficiency filter effect of loss.
3, the utility model fence gate formula filter, can make frequently that the ripple passband produces more pole and zero, make bandpass flatness improve, but and the nearer other wavestrip of filtering simultaneously and dwindle buffer zone between adjacent channel, produce comparatively precipitous decay, and can reach higher quality factor.
4, the utility model fence gate formula filter, because of having higher quality factor, but the nearer other wavestrip of filtering and dwindle buffer zone between adjacent channel, the situation that frequency is used is more efficient, and is applicable to mirror image filtering.
5, the utility model fence gate formula filter does not need extra ground connection, and is the copline framework, so processing procedure is quite easy, and can reduce the cost of making.
In sum, the fence gate formula filter of the utility model innovation structure, be to hand over the mode of holding designed with quarter-wave transmission line and a plurality of resonant cavity of operating frequency, include to hand over and hold resonance unit and the formation of middle coupling unit circuit layout as fence gate formula copline framework, and utilize the electromagentic resonance coupling of quarter-wave transmission line and resonant cavity, reach the purpose of filtering.It has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing filter has the multinomial effect of enhancement, thus be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is 3 rank fence gate formula filter circuit schematic layout patterns of the utility model preferred embodiment.
Fig. 2 A is the circuit diagram of equivalent electric circuit (1) of 3 rank fence gate formula filters of the utility model preferred embodiment.
Fig. 2 B is the circuit diagram of equivalent electric circuit (2) of 3 rank fence gate formula filters of the utility model preferred embodiment.
Fig. 2 C is the circuit diagram of equivalent electric circuit (3) of 3 rank fence gate formula filters of the utility model preferred embodiment.
Fig. 3 is the frequency response chart under the particular job frequency field of the present utility model.
Fig. 4 is 4 rank fence gate formula filter circuit schematic layout patterns of another preferred embodiment of the utility model.
10: resonance unit 11 is held in elementary friendship: dried font transmission line
12: ㄇ font transmission line resonant cavity characteristic impedance 13: the characteristic impedance of ㄇ font transmission line resonant cavity
20: last rank are handed over and are held resonance unit 21: dried font transmission line
22: ㄇ font transmission line resonant cavity characteristic impedance 23: the characteristic impedance of ㄇ font transmission line resonant cavity
30: middle coupling unit 31: cross transmission line
32: ㄇ font transmission line resonant cavity characteristic impedance 33: the characteristic impedance of ㄇ font transmission line resonant cavity
40: middle coupling unit 41: cross transmission line
42: ㄇ font transmission line resonant cavity characteristic impedance 43: the characteristic impedance of ㄇ font transmission line resonant cavity
50: Ω transmission line C101～C313: capacity cell
L1～L6: inductance element
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined utility model purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, to according to its embodiment of fence gate formula filter, structure, feature and the effect thereof that the utility model proposes, describe in detail as after.
Seeing also shown in Figure 1ly, is 3 rank fence gate formula filter circuit schematic layout patterns of the utility model one preferred embodiment, at first explains with regard to its circuit layout.The utility model fence gate formula filter, it includes at least, and resonance unit 10 is held in elementary friendship and resonance unit 20 is held in the friendship of last rank, be outermost output of circuit layout and the input two ends that are arranged at the copline framework respectively, it is with two " ㄇ " font transmission lines 12,13 friendships are held in one " doing " font transmission line 11, and two " ㄇ " font transmission line resonant cavities 22,23 friendships are held in one " doing " font transmission line 21 and are constituted, at this friendship place of holding is to constitute two resonant cavities with the quarter-wave transmission line design of operating frequency to hand over the mode of holding, hand over the resonant cavity of holding to produce the electromagentic resonance coupling effect to utilize, and characteristic impedance 50 Ω transmission lines 14,24 are respectively its input port and output port; Hold resonance unit 10 in this elementary friendship at two ends again and hand over the centre of holding resonance unit 20 with these rank, end, again in abutting connection with a middle coupling unit 30, constituted with " ten " font transmission line 31 that two " ㄇ " font transmission line 32,33 subtends connect 1/2nd wavelength of an approximate operating frequency, and just parallel this " ㄇ " font transmission line resonant cavity 12,13 and this " ㄇ " font transmission line resonant cavity 22,23 sides of being adjacent to, and be quarter-wave coupling with approximate operating frequency at this adjoiner, to produce the electromagentic resonance coupling effect.
Seeing also shown in Fig. 2 A to Fig. 2 C, is the circuit diagram of equivalent electric circuit (1) of 3 rank fence gate formula filters of the utility model preferred embodiment.Shown in Fig. 2 A and Fig. 2 C, be respectively that resonance unit 10 is held in elementary friendship in the 3 rank fence gate formula filters and the equivalent electric circuit of holding resonance unit 20 is handed on last rank, its π shape electric capacity networking C101, C102, C103, C104, C105, C106, C207, C208, C209 and C210, C211, C212 and capacity cell C109, C110, C205 and C206, be respectively this and " do " font transmission line 11,21 with should " ㄇ " font transmission line resonant cavity 12,13,22,23 equivalent electric circuits that intercouple, and inductance component L 1, L2, L5 and L6 and capacity cell C107, C108, series resonant circuit and capacity cell C111 that C203 and C204 form, C112, C201 and C202 are respectively this " ㄇ " font transmission line resonant cavity 12,13,22, the equivalent electric circuit of 23 resonance.
Please consult shown in Fig. 2 B again, it is the equivalent circuit diagram of the middle coupling unit 30 of 3 rank fence gate formula filters, its π shape electric capacity networking C301, C302, C303, C304, C305, C306, C308, C309, C310 and C311, C312, C313 are respectively this " ㄇ " font transmission line resonant cavity 12,13,22 and 23 and the equivalent electric circuit that should " ㄇ " font transmission line resonant cavity 32,33 intercouples, and inductance component L 3 and L4 and capacity cell C307 are the equivalent electric circuit of this " ten " font transmission line 31.
Therefore, the fence gate formula filter of handing over the mode of holding to design with above-mentioned quarter-wave transmission line and resonant cavity, resonance unit 10 is held in this elementary friendship of cause and the transmission line of holding in the resonance unit 20 is handed on last rank, and the electromagentic resonance coupling effect that transmission line produced of this centre coupling unit 30, so can make this fence gate formula filter produce limit and zero point at the particular job Frequency point, suppress effect and have splendid outer frequency, please cooperate consult shown in Figure 3, it is the frequency response chart under the particular job frequency field of the present utility model, promptly this fence gate formula filter operations is under the particular job frequency, by input and output measurement to insertion loss and the relativeness that under frequency field, presented of reflection loss (return loss).Because of it has the resonant cavity that a plurality of friendships are held in the circuit feed side, can produce preferable electromagnetic coupled, therefore can reach the characteristics that preferable input coupling reaches lower insertion loss, and can make ripple passband and the more pole and zero of other wavestrip generation frequently, make bandpass flatness improve, but and the nearer other wavestrip of filtering simultaneously and dwindle buffer zone between adjacent channel, produce comparatively precipitous decay, and can reach higher quality factor, thereby have splendid outer frequency and suppress ability, the situation that frequency is used is more efficient, and is applicable to mirror image filtering.
Again because the circuit layout of this fence gate formula filter is to be the copline framework, and do not need extra earth connection, therefore processing procedure is quite easy, and the symmetric design of circuit layout, can be so that the design simulation time decreased, and when being designed to the filter of high-order, only need and to duplicate and parallel adjacency by middle coupling unit 30, please cooperate consult shown in Figure 4, be 4 rank fence gate formula filter circuit layouts of another preferred embodiment of the utility model, promptly utilize aforesaid circuit design principle, coupling units 40 in the middle of these centre coupling unit 30 other parallel adjacency one in script 3 rank fence gate formula filters, and constitute one 4 rank fence gate formula filters, therefore can reach the purpose of design high-order band-pass filters easily.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, any those skilled in the art, in the scope that does not break away from technical solutions of the utility model, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solutions of the utility model content, foundation technical spirit of the present utility model is to above any simple modification that embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (5)
1, a kind of fence gate formula filter is the design of handing over the mode of holding with quarter-wave transmission line and a plurality of resonant cavity of operating frequency, it is characterized in that it comprises at least:
The resonance unit is held in one elementary friendship, and the input that the resonance unit is arranged at this fence gate formula filter outside is held in this elementary friendship, in order to receive behind the signal in addition filtering;
At least one coupling unit in the middle of one, this centre coupling unit is arranged in this fence gate formula filter, and parallelly is connected in this elementary friendship and holds the resonance unit, and this centre coupling unit is in order to the noise in this signal of filtering; And
One last rank are handed over and are held the resonance unit, and these rank, end are handed over and held the resonance unit and be arranged at the output in this fence gate formula filter outside and connect this centre coupling unit, in order to receive behind this signal in addition filtering and to be sent to output.
2, fence gate formula filter according to claim 1, it is characterized in that the resonance unit is held in wherein said elementary friendship and the resonance unit is held in the friendship of last rank, it is quarter-wave transmission line with operating frequency, and the friendship that is designed to have at least one one quarter-wave resonant cavity holds mode, to produce the purpose of electromagentic resonance coupling.
3, fence gate formula filter according to claim 1 is characterized in that the resonance unit is held in wherein said elementary friendship and the resonance unit is held in the friendship of last rank, has more outward extending transmission line, constitutes the input and the output of this circuit respectively.
4, fence gate formula filter according to claim 1, it is characterized in that wherein said middle coupling unit, be quarter-wave transmission line, and be designed to have at least one one quarter-wave resonant cavity, to produce the purpose of electromagentic resonance coupling with operating frequency.
5, fence gate formula filter according to claim 1 it is characterized in that wherein said transmission line can be microstrip line, strip line, and all has the dielectric wire of signal transfer functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420093130 CN2749064Y (en) | 2004-09-08 | 2004-09-08 | Grating filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420093130 CN2749064Y (en) | 2004-09-08 | 2004-09-08 | Grating filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2749064Y true CN2749064Y (en) | 2005-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420093130 Expired - Fee Related CN2749064Y (en) | 2004-09-08 | 2004-09-08 | Grating filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN2749064Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414520A (en) * | 2013-08-29 | 2013-11-27 | 成都成电光信科技有限责任公司 | Optical signal receiving-sending device |
| CN103425166A (en) * | 2013-08-20 | 2013-12-04 | 成都成电光信科技有限责任公司 | Filtering and voltage stabilizing circuit |
-
2004
- 2004-09-08 CN CN 200420093130 patent/CN2749064Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103425166A (en) * | 2013-08-20 | 2013-12-04 | 成都成电光信科技有限责任公司 | Filtering and voltage stabilizing circuit |
| CN103414520A (en) * | 2013-08-29 | 2013-11-27 | 成都成电光信科技有限责任公司 | Optical signal receiving-sending device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051228 Termination date: 20120908 |