CN102569952A - Frequency band splitting technology-based three-frequency band pass filter - Google Patents
Frequency band splitting technology-based three-frequency band pass filter Download PDFInfo
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- CN102569952A CN102569952A CN2011103351769A CN201110335176A CN102569952A CN 102569952 A CN102569952 A CN 102569952A CN 2011103351769 A CN2011103351769 A CN 2011103351769A CN 201110335176 A CN201110335176 A CN 201110335176A CN 102569952 A CN102569952 A CN 102569952A
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Abstract
The invention relates to a frequency band splitting technology-based three-frequency band pass filter which is formed by a stub broadband filter and a double-frequency band rejection filter which are in mutual circuit embedding; a main transmission line is shared; the stub broadband filter comprises closed stubs which are connected through the transmission line; the double-frequency band rejection filter comprises composite resonators which are connected by the transmission line; and the composite resonator comprises an upper open stub and a lower open stub. In the invention, the frequencies and bandwidths of three pass bands are easy to regulate and set, so that the loss is low and the inter-band inhibition is high.
Description
Technical field
The present invention relates to a kind of filter, be specifically related to a kind of three band-pass filters based on the band segmentation technology.
Background technology
In recent years, along with the continuous development of radio communication, new communication standard continues to bring out, and can support the multimode of a plurality of standards and multi frequency system to become an important developing direction.And three frequency stub broadband filters are exactly one of important devices that makes up these systems.There are some schemes to realize three-passband filter both at home and abroad at present.The band splitting technology at first is used to realize double frequency band-pass filter.Through a stub broadband filter and a band stop filter are connected, stopband isolates passband, thereby produces two passbands.The shortcoming of this method is the size that needs to use two filters, and volume is bigger, need do the improvement of great technology and method aspect for realizing three band-pass filters.
Summary of the invention
The present invention has overcome the deficiency of prior art, has proposed a kind of three band-pass filters based on band segmentation technology, and said filter embeds a stub broadband filter and a double frequency band stop filter mutually and realized the logical response of three frequency bands.The size of three band-pass filters that produce is suitable with the size of a stub filter, and its advantage is higher circuit efficiency and bigger passband design freedom.
Technical scheme of the present invention is: based on three band-pass filters of band segmentation technology; It is formed by a stub broadband filter and the mutual embedding of double frequency rejector circuit, a shared main transmission line, and said stub broadband filter comprises closed stub; Said closed stub is connected through transmission line; Said double frequency band stop filter comprises compound resonator, and said compound resonator is linked to each other by transmission line, and said compound resonator comprises open stub and following open stub; The method of said stub broadband filter and the mutual embedding of said double frequency rejector circuit is: the compound resonator that is comprised said double frequency band stop filter is loaded into the mid point of each transmission line of said stub broadband filter respectively; Double frequency band stop filter and stub broadband filter are integrated in the circuit; Share said main transmission line, the passband of stub broadband filter is formed three passbands by two stopband division backs that the double frequency band stop filter is comprised.
The way of realization of said three band-pass filters can be microstrip line form, strip line form or co-planar waveguide form.
Last open stub in the said compound resonator has different length with following open stub, is respectively applied for to produce a stopband, realizes biobelt resistance filter.
The present invention has following beneficial effect:
The present invention relates to a new little band three-passband filter, one of them stub broadband filter and a double frequency band stop filter embed each other.It is inner that two stopbands of double frequency band stop filter are positioned at the passband of stub broadband filter, and the passband one of stub broadband filter is divided into three, produces three band-pass filters of a compact conformation.Advantage:
1) frequency of three passbands and bandwidth are easy to regulate and are provided with;
2) low-loss suppresses between high-band.
3) size is less.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the topological structure sketch map of stub broadband filter of the present invention.
Fig. 2 is a double frequency-band resistance filter topology sketch map of the present invention.
Fig. 3 is a topological structure sketch map of the present invention.
Fig. 4 is a compound resonator topological structure sketch map of the present invention.
Among the figure, 1, transmission line; 2, closed stub; 3, go up open stub; 4, following open stub.
Further specify below in conjunction with accompanying drawing, and unrestricted scope involved in the present invention.
Embodiment
Extremely shown in Figure 4 referring to Fig. 1; The present invention is formed by a stub broadband filter and the mutual embedding of double frequency rejector circuit, a shared main transmission line, and said stub broadband filter comprises some closed stubs 2; Said closed stub 2 is connected through transmission line 1; Said double frequency band stop filter comprises a plurality of compound resonators, and said compound resonator is linked to each other by transmission line 1, and said compound resonator comprises open stub 3 and following open stub 4; The method of said stub broadband filter and the mutual embedding of said double frequency rejector circuit is: the compound resonator that is comprised said double frequency band stop filter is loaded into the mid point of each transmission line 1 of said stub broadband filter respectively; Double frequency band stop filter and stub broadband filter are integrated in the circuit; Share said main transmission line, the passband of stub broadband filter is formed three passbands by two stopband division backs that the double frequency band stop filter is comprised.
The way of realization of said three band-pass filters can be microstrip line form, strip line form or co-planar waveguide form.
Last open stub 3 in the said compound resonator has different length with following open stub 4, is respectively applied for to produce a stopband, realizes biobelt resistance filter.
Fig. 1 is the topology diagram of stub broadband filter, and wherein, some quarter-wave closed stubs 2 are linked to each other by the transmission line 1 of certain-length as resonator.Transmission line 1 is used to realize admittance (or J) converter, realizes the close coupling between the resonator.Fig. 2 is the circuit diagram of double frequency band stop filter.This double frequency band stop filter is made up of the plurality of compound resonator, and the transmission line 1 by certain-length between the compound resonator links to each other.Compound resonator comprises open stub 3 and following open stub 4, and its length has determined the centre frequency of two stopbands.
Wherein C is the light velocity,
ReffIt is the effective dielectric constant of main transmission line.
Fig. 3 is the hybrid circuit of Fig. 1 and Fig. 2.Wherein each compound resonator in the double frequency band stop filter has been loaded into the mid point of corresponding transmission line 1 in the stub broadband filter.Double frequency band stop filter and stub broadband filter are integrated into a circuit, and the two shares same main transmission line.And the passband of stub broadband filter is split into three passbands by two stopbands of double frequency band stop filter.
The present invention has designed one three stub broadband filter frequently, and its three passbands are divided into and are 1.05-1.3,1.85-2.05 and 2.75-2.9GHz.It is that 0.508mm and dielectric constant are on 3.38 the medium substrate that this filter is implemented in a thickness.Circuit structure as a symmetry; Actual measurement and circuit simulation result are more identical, and the loss of frequency band one, frequency band two and third-class three passbands of frequency band is respectively 0.5dB, and 1.3dB and 1.3dB. return loss reach 15dB respectively; 15dB and 10dB. interband are isolated higher, are respectively 28dB and 50dB.As the result of circuit optimization, the length of four closed stubs 2 is also inequality.The length of three open stub of main transmission line top is longer, is used to realize stopband between two lower passbands; Three short open stub of main transmission line below are used to realize second and the 3rd stopband between the passband.And the frequency of two stopbands and bandwidth are bigger to the frequency and the bandwidth influence of three passbands.Frequency and bandwidth through regulating two stopbands can realize the adjusting to the frequency and the bandwidth of three passbands.
Claims (3)
1. based on three technological band-pass filters of band segmentation; It is characterized in that: it is formed by a stub broadband filter and the mutual embedding of double frequency rejector circuit, a shared main transmission line, and said stub broadband filter comprises closed stub; Said closed stub is connected through transmission line; Said double frequency band stop filter comprises compound resonator, and said compound resonator is linked to each other by transmission line, and said compound resonator comprises open stub and following open stub; The method of said stub broadband filter and the mutual embedding of said double frequency rejector circuit is: the compound resonator that is comprised said double frequency band stop filter is loaded into the mid point of each transmission line of said stub broadband filter respectively; Double frequency band stop filter and stub broadband filter are integrated in the circuit; Share said main transmission line, the passband of stub broadband filter is formed three passbands by two stopband division backs that the double frequency band stop filter is comprised.
2. three band-pass filters based on the band segmentation technology according to claim 1, it is characterized in that: its way of realization can be microstrip line form, strip line form or co-planar waveguide form.
3. three band-pass filters based on the band segmentation technology according to claim 1 and 2; It is characterized in that: the last open stub in the said compound resonator has different length with following open stub; Be respectively applied for and produce a stopband, realize biobelt resistance filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103351769A CN102569952A (en) | 2011-10-28 | 2011-10-28 | Frequency band splitting technology-based three-frequency band pass filter |
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| CN2011103351769A CN102569952A (en) | 2011-10-28 | 2011-10-28 | Frequency band splitting technology-based three-frequency band pass filter |
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| CN102569952A true CN102569952A (en) | 2012-07-11 |
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| CN2011103351769A Pending CN102569952A (en) | 2011-10-28 | 2011-10-28 | Frequency band splitting technology-based three-frequency band pass filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606725A (en) * | 2013-11-25 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Parallel open-circuit stepped impedance low-pass filter |
| CN109286055A (en) * | 2018-10-25 | 2019-01-29 | 成都会讯科技有限公司 | A kind of symmetric double detail parallel resonator and bandpass filter and design method |
| CN109521374A (en) * | 2018-10-18 | 2019-03-26 | 北京航空航天大学 | It is embedded in integrated balun and loads the tangential electric field probe of resonance of modified dipole |
| CN110556615A (en) * | 2019-09-07 | 2019-12-10 | 西南交通大学 | multi-frequency band-pass filter based on coupling symmetrical short-circuit branch multimode resonator |
| CN113067113A (en) * | 2021-03-29 | 2021-07-02 | 上海海事大学 | Three-passband filter based on microstrip line loading open-circuit short-section |
| CN113285186A (en) * | 2021-04-01 | 2021-08-20 | 西安理工大学 | Broadband band elimination filter based on TSV |
Citations (1)
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| US5291161A (en) * | 1991-07-22 | 1994-03-01 | Matsushita Electric Industrial Co., Ltd. | Microwave band-pass filter having frequency characteristic of insertion loss steeply increasing on one outside of pass-band |
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2011
- 2011-10-28 CN CN2011103351769A patent/CN102569952A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5291161A (en) * | 1991-07-22 | 1994-03-01 | Matsushita Electric Industrial Co., Ltd. | Microwave band-pass filter having frequency characteristic of insertion loss steeply increasing on one outside of pass-band |
Non-Patent Citations (2)
| Title |
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| HONG-MING LEE: "transmission-line filter design with fully controllable second passband", 《IEEE/IEE ELECTRONIC LIBRARY数据库》 * |
| YUN LIU: "a dual-band filter realized by alternately connecting the main transmission-line with shunt stubs and shunt serial resonators", 《IEEE/IEE ELECTRONIC LIBRARY数据库》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606725A (en) * | 2013-11-25 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Parallel open-circuit stepped impedance low-pass filter |
| CN109521374A (en) * | 2018-10-18 | 2019-03-26 | 北京航空航天大学 | It is embedded in integrated balun and loads the tangential electric field probe of resonance of modified dipole |
| CN109521374B (en) * | 2018-10-18 | 2020-10-27 | 北京航空航天大学 | Resonance tangential electric field probe embedded with integrated balun and loaded improved dipole |
| CN109286055A (en) * | 2018-10-25 | 2019-01-29 | 成都会讯科技有限公司 | A kind of symmetric double detail parallel resonator and bandpass filter and design method |
| CN110556615A (en) * | 2019-09-07 | 2019-12-10 | 西南交通大学 | multi-frequency band-pass filter based on coupling symmetrical short-circuit branch multimode resonator |
| CN113067113A (en) * | 2021-03-29 | 2021-07-02 | 上海海事大学 | Three-passband filter based on microstrip line loading open-circuit short-section |
| CN113285186A (en) * | 2021-04-01 | 2021-08-20 | 西安理工大学 | Broadband band elimination filter based on TSV |
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Application publication date: 20120711 |