CN101702458A - Ultra wide band filter with band-stop characteristic - Google Patents
Ultra wide band filter with band-stop characteristic Download PDFInfo
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- CN101702458A CN101702458A CN200910186605A CN200910186605A CN101702458A CN 101702458 A CN101702458 A CN 101702458A CN 200910186605 A CN200910186605 A CN 200910186605A CN 200910186605 A CN200910186605 A CN 200910186605A CN 101702458 A CN101702458 A CN 101702458A
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Abstract
The invention relates to an ultra wide band filter with band-stop characteristic, formed by coupling of a symmetrical spurline structure composed of a first spurline (3) and a second spurline (4) and an interdigitated type coupled structures (2) and (5). The invention adopts UWB filter loaded with symmetrical spurline structure without increasing circuit area and processing complexity, thus being capable of working at 3.1-10.6GHz frequency band used in UWB communication system. And the structure of the invention can produce a stop band with attenuation more than minus 15dB at 5.2-5.8GHz, thus effectively reducing interference of UWB communication system on wireless local area network. The structure of the invention does not require a band-stop filter to be connected in UWB filter in series, thus being compact in design and easy for integration. The invention is applicable to wireless local area network frequency band and dense integrated circuit.
Description
Technical field
The present invention relates to a kind of ultra-wide band filter that adopts novel loading symmetry spur slot structure multimode resonator to realize, belong to the microwave transmission device technical field with band resistance characteristic.
Background technology
Along with developing rapidly of the communication technology, people are more and more higher to the requirement of the information transmission system.Ultra broadband (UWB) technology is simple with its system, and cost is low, and power consumption is little, and data transmission bauds is fast, and advantages such as fail safe height become a research focus of the present communications field.As an important devices of this system, the UWB band pass filter of high selectivity has obtained increasing concern.But since with the overlapping interference that causes easily of the working frequency range (5.2-5.8GHz) of WLAN (wireless local area network).Therefore need design the WLAN (wireless local area network) frequency range have band resistance characteristic the UWB filter.
The method of adding the open circuit minor matters or adding the H type groove of DGS structure at the first substrate of little band is adopted in the realization of traditional band resistance characteristic usually, adding the open circuit minor matters can make the filter construction that designs become big, and the DGS structure that increases H type groove not only at needs in ground plate back-etching technology and position correction program, and destroyed the integrated encapsulation of signal.And these filters do not reach very big decay at the 5.2-5.8GHz frequency band.
Spur slot (Spurline) is little band defect sturcture of planting a kind of simple, compact, the coplane in traditional microstrip line.This structure need not in the check and correction of the etching technics at the ground plate back side and position, thereby compact to design, be easy to integrated, easy to use in intensive integrated circuits.And the spur slot has good band gap properties, has been used to antenna and Filter Design.
Publication number CN100495813 discloses a kind of ultra-wide band filter, includes low frequency LC filter and high frequency absorption formula filter, and its filtering frequency range is 10kHz～110GHz, and the resistance in-band insertion loss is not less than 80dB; Publication number CN101079605 discloses and a kind ofly can suppress the small wide-frequency filter that the WLAN signal disturbs, and comprising: front portion, reverse side part and input output port.The front portion comprises: interdigital capacitor unit, T type stub unit, through-hole unit, uniform transmission line unit and dielectric-slab.The interdigital capacitor unit has two, links to each other by a T type stub unit between two interdigital capacitor unit.The input output port have two, each port links to each other with a uniform transmission line unit.Reverse side partly comprises: non-homogeneous DGS unit, H type slot construction unit and ground unit, and non-homogeneous DGS unit has six, and the overall dimension of each unit is with the non-homogeneous arrangement of arithmetic progression, totally two of H type slot construction units.
Summary of the invention
The objective of the invention is, disturb at the signal of wireless communication frequency band (5.2-5.8GHz) in order to suppress the UWB frequency range, the present invention proposes a kind of multimode resonator that loads symmetrical spur slot, and realized the UWB filter with this structure, the filter of gained is not only simple in structure but also can curb interference in the WLAN (wireless local area network) frequency range effectively.
Technical scheme of the present invention is, constitute symmetrical spur slot structure by two identical slots of length of the first spur slot and the second spur slot being used to produce load on the multimode resonator of ultra broadband characteristic, the multimode resonator of symmetrical spur slot structure is formed with the coupling of interdigital formula coupled structure and is had the ultra-wide band filter that band hinders characteristic.
Fig. 1 is the structure chart of the multimode resonator of the symmetrical spur slot of loading.Symmetry spur slot structure is made of (4) two slots that length is identical of the first spur slot (3) and the second spur slot, and the first spur slot (3) and the second spur slot (4) lay respectively at the both sides up and down of multimode resonator mid portion; Symmetry spur slot structure has stopband characteristic, and by the coupling between two symmetrical spur slots, the band that produces in needed frequency range hinders characteristic.
Fig. 2 is the schematic layout pattern of the ultra-wide band filter of the symmetrical spur slot structure of employing.(2), (5) are respectively the interdigital coupled structures of input and output and multimode resonator coupling; (1) be input port, (6) are output ports, and the coupling between I/O and multimode resonator realizes by interdigital structure (2), (5).
Signal is from input port (1) input, is coupled to as shown in Figure 1 multimode resonator by interdigital formula coupled structure, is coupled to output port (6) by the interdigital structure between this multimode resonator and output port then.The characteristic impedance of the microstrip line of input/output port all is 50 ohm.Wherein symmetrical spur slot structure is carried in the both sides up and down at multimode resonator middle part respectively.The symmetrical spur slot structure that loads forms a stopband in the passband of ultra-wide band filter.Stopband position in this filtering characteristic can be regulated by symmetrical spur slot structure length, and the bandwidth of stopband is regulated by the distance between two spur lines, thereby makes traditional ultra-wide band filter present good band resistance characteristic in the WLAN (wireless local area network) frequency range.And since two spur lines to influence in other the passband seldom, so other parts of ultra-wide band filter still embody good pass-band performance, the part that band hinders in the example to the inhibition of signal reach-below the 15dB.
The present invention's beneficial effect compared with the prior art is to adopt the UWB filter of this symmetry spur slot structure not only can be operated in 3.1GHz～10.6GHz frequency band that the UWB communication system is used.And structure of the present invention can produce the stopband of decay greater than-15dB at 5.2GHz～5.8GHz place, therefore reduced the interference of UWB communication system to WLAN (wireless local area network) effectively.Structure of the present invention need not at UWB filter polyphone band stop filter, thereby compact to design, is easy to integratedly, is convenient to use in intensive integrated circuits.
The present invention is applicable to the WLAN (wireless local area network) frequency range and uses in intensive integrated circuits.
Description of drawings
Fig. 1 is the multimode resonator structure chart that loads symmetrical spur slot;
Fig. 2 is the schematic layout pattern that adopts the ultra-wide band filter of symmetrical spur slot structure;
Among the figure: (3), (4) are respectively the structures of two symmetric form spur lines; (2), (5) are respectively the interdigital coupled structures of input and output and multimode resonator coupling;
(1) is input port; (6) be output port.
Embodiment
The embodiment of the invention as shown in Figure 2.On multimode resonator, be loaded with the symmetrical spur slot structure and the coupling of interdigital formula coupled structure that constitute by spur slot 3 and spur slot 4 and form ultra-wide band filter with band resistance characteristic.
Signal is coupled to multimode resonator from input port (1) input by interdigital formula coupled structure (2), is coupled to output port (6) by the interdigital structure (5) between this multimode resonator and output port then.The characteristic impedance of the microstrip line of input/output port all is 50 ohm.Wherein symmetrical spur slot structure is carried in the both sides up and down at multimode resonator middle part respectively.The symmetrical spur slot structure that loads forms a stopband in the passband of ultra-wide band filter.Stopband position in this filtering characteristic can be regulated by symmetrical spur slot structure length, and the bandwidth of stopband is regulated by the distance between two spur lines, thereby makes traditional ultra-wide band filter present good band resistance characteristic in the WLAN (wireless local area network) frequency range.And since two spur lines to influence in other the passband seldom, so other parts of ultra-wide band filter still embody good pass-band performance, the part that band hinders among the embodiment to the inhibition of signal reach-below the 15dB.
Claims (4)
1. one kind has the ultra-wide band filter that band hinders characteristic, it is characterized in that described ultra-wide band filter is coupled to form by load the symmetrical spur slot structure and the interdigital formula coupled structure that are made of the first spur slot (3) and the second spur slot (4) on multimode resonator.
2. a kind of ultra-wide band filter according to claim 1 with band resistance characteristic, it is characterized in that, the described first spur slot (3) that loads on multimode resonator and the second spur slot (4) lay respectively at the both sides up and down of multimode resonator mid portion, and two spur slot length are identical.
3. a kind of ultra-wide band filter with band resistance characteristic according to claim 1 is characterized in that the coupling between described I/O and multimode resonator realizes by interdigital structure (2) and (5).
4. a kind of ultra-wide band filter with band resistance characteristic according to claim 1 is characterized in that, the described first spur slot (3) and the second spur slot (4) be because equal in length, thus in the ultra broadband pass-band performance stopband of formation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910186605A CN101702458A (en) | 2009-12-02 | 2009-12-02 | Ultra wide band filter with band-stop characteristic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910186605A CN101702458A (en) | 2009-12-02 | 2009-12-02 | Ultra wide band filter with band-stop characteristic |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779641A (en) * | 2014-01-22 | 2014-05-07 | 上海海事大学 | Novel UWB filter of central loading folding limb multi-mode resonator structure |
| CN104934664A (en) * | 2015-07-06 | 2015-09-23 | 电子科技大学 | A high-selectivity submillimeter wave ultra wide band filter based on a vehicle-mounted radar system |
| CN110380169A (en) * | 2019-06-27 | 2019-10-25 | 南京理工大学 | A kind of adjustable ultra-wide band filter of trap frequency with improvement band-stop response |
| CN110729533A (en) * | 2019-09-30 | 2020-01-24 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Asymmetric SIR loaded wide stop band suppression broadband band-pass filter |
| CN110994094A (en) * | 2019-12-03 | 2020-04-10 | 上海海事大学 | Differential three-passband filter for loading UIR based on T-branch node |
-
2009
- 2009-12-02 CN CN200910186605A patent/CN101702458A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779641A (en) * | 2014-01-22 | 2014-05-07 | 上海海事大学 | Novel UWB filter of central loading folding limb multi-mode resonator structure |
| CN104934664A (en) * | 2015-07-06 | 2015-09-23 | 电子科技大学 | A high-selectivity submillimeter wave ultra wide band filter based on a vehicle-mounted radar system |
| CN110380169A (en) * | 2019-06-27 | 2019-10-25 | 南京理工大学 | A kind of adjustable ultra-wide band filter of trap frequency with improvement band-stop response |
| CN110729533A (en) * | 2019-09-30 | 2020-01-24 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Asymmetric SIR loaded wide stop band suppression broadband band-pass filter |
| CN110994094A (en) * | 2019-12-03 | 2020-04-10 | 上海海事大学 | Differential three-passband filter for loading UIR based on T-branch node |
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Application publication date: 20100505 |