CN103928732A - Micro-strip line absorption band-pass filter - Google Patents
Micro-strip line absorption band-pass filter Download PDFInfo
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- CN103928732A CN103928732A CN201410189323.XA CN201410189323A CN103928732A CN 103928732 A CN103928732 A CN 103928732A CN 201410189323 A CN201410189323 A CN 201410189323A CN 103928732 A CN103928732 A CN 103928732A
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Abstract
The invention discloses a micro-strip line absorption band-pass filter. The micro-strip line absorption band-pass filter is used for solving the problems that an existing LC absorption filter is not prone to being integrated with an active device and poor in compatibility. The micro-strip line absorption band-pass filter comprises two identical parallel coupled line directional couplers, two identical micro-strip pectinate line band-pass filters and a matched load. The micro-strip line absorption band-pass filter has the advantages of being compact in structure, high in working frequency band, wide in bandwidth, low in cost, prone to being integrated with the active device, good in compatibility and simple to design.
Description
Technical field
The invention belongs to wave filter technology field, be specifically related to the absorption band pass filter of a kind of microstrip line.
Background technology
From communication system to radio astronomy, the filter microwave component that is absolutely necessary, nearly all microwave receiver, transmitter and microwave test equipment all requires to have the function of filter.Conventional filter is reflecting filter, is to reach by the energy of unwanted frequency composition being reflected back to signal source the object that suppresses filtering, realizes frequency selection function.But some occasion but needs to use absorbing mode filter, outer band energy is sponged.For example, be used on high-power transmitter, to protect high power valve, make it to avoid by the caused harmful resonance of reflected energy.The amplifier of high-gain is absolute stability under test environment, but out of band signal can cause unnecessary feedback under packaging environment, make the unstable of amplifier change, and the use of absorbing mode filter will be avoided the generation of this problem.
Absorbing mode filter, Main Function is by interference signal, especially the electromagnetic energy of high-frequency interferencing signal is converted into heat energy, consumes, and then reaches filter effect.Absorbing mode filter mainly contains two classes: a class is from single-ended prototype, realizes the full coupling of passband and stopband with the different filters of the form combination mechanical admittance curves complementation of duplexer or multiplexer; Another kind of is that two reflecting filters and two 3dB directional couplers are combined, and the energy of stopband internal reflection is absorbed.And the latter has easy realization, the feature such as power capacity is large, bandwidth.
With regard to operating frequency, in the time that operating frequency exceedes 500MHz, filter is difficult to adopt discrete component to be realized, and this is because the physical size of operation wavelength and filter element is close, thereby has caused many-sided loss and made circuit performance severe exacerbation.And traditional LC absorbing mode filter is difficult for active device integrated, compatible bad.
Summary of the invention
Deficiency for said method of the present invention, and provide a kind of microstrip line for microwave filtering field absorption band pass filter, has higher working frequency range, have again wider bandwidth, and cost is low, be easy to integrated, simplicity of design.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
The absorption band pass filter of a kind of microstrip line, is characterized in that, comprises that the first parallel coupled line is determined coupler, the second parallel coupled line directional coupler, first reflects the band combline bandpass filter and second that declines and reflects the band combline bandpass filter that declines; The first reflection declines and connects the straight-through port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the first reflection declines and connects the input port of the second parallel coupled line directional coupler with the output port of combline bandpass filter; The second reflection declines and connects the isolated port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the second reflection declines and connects the coupling port of the second parallel coupled line directional coupler with the output port of combline bandpass filter;
The isolated port of the input port of the first parallel coupled line directional coupler and the second parallel coupled line directional coupler is respectively as input and the output of the absorption band pass filter of microstrip line.
The coupling port of described the first parallel coupled line directional coupler is connected with for absorbing the decline matched load of the out of band signal reflecting with combline bandpass filter of first, second reflection.
The straight-through port of described the second parallel coupled line directional coupler is connected with the matched load for absorbing the signal that leaks into this straight-through port.
Described matched load is 50 Ω resistance.
Described first, second parallel coupled line directional coupler is parallel coupled line 3dB directional coupler.
Operation principle of the present invention is: signal is from the input port input of the first parallel coupled line directional coupler, logical inband signaling after the first parallel coupled line location coupler main channel is divided equally through two identical reflections band combline bandpass filter (first that declines, the second reflection declines and is with combline bandpass filter), in the isolated port stack output of the second parallel coupled line directional coupler, and resistance inband signaling is reflected to decline and is reflected back the coupling port stack output of the first parallel coupled line directional coupler and is absorbed by matched load with combline bandpass filter.The passband of the absorption band pass filter of microstrip line of the present invention mainly determines by reflective combline bandpass filter, and Absorber Bandwidth is mainly determined by the bandwidth of parallel coupled line directional coupler.
Compared with prior art, the present invention has following beneficial effect:
The invention has the advantages that: compact conformation, working frequency range is higher, broader bandwidth, cost is low, and easily integrated with active device, compatibility is good, the feature of simplicity of design.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the embodiment of the present invention one parallel coupled line 3dB directional coupling structure schematic diagram;
Fig. 3 is the embodiment of the present invention one parallel coupled line 3dB directional coupler circuit layout;
Fig. 4 is the embodiment of the present invention one combline bandpass filter structure chart;
Fig. 5 is the embodiment of the present invention one combline bandpass filter circuit layout;
Fig. 6 is circuit layout of the present invention;
Fig. 7 is that the present invention carries out simulation result figure at Microwave simulation software AWR;
Mark in figure: 1 is the input port of parallel coupled line 3dB directional coupler, 2, the straight-through port of parallel coupled line 3dB directional coupler, 3, the coupling port of parallel coupled line 3dB directional coupler, 4, the isolated port of parallel coupled line 3dB directional coupler, 5, matched load.
Embodiment
Below in conjunction with embodiment, the invention will be further described, and described embodiment is only the present invention's part embodiment, is not whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiment used that obtain under creative work prerequisite, belongs to protection scope of the present invention.
The absorption band pass filter of microstrip line of the present invention, comprises that the first parallel coupled line is determined coupler, the second parallel coupled line directional coupler, first reflects the band combline bandpass filter and second that declines and reflects the band combline bandpass filter that declines; The first reflection declines and connects the straight-through port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the first reflection declines and connects the input port of the second parallel coupled line directional coupler with the output port of combline bandpass filter; The second reflection declines and connects the isolated port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the second reflection declines and connects the coupling port of the second parallel coupled line directional coupler with the output port of combline bandpass filter; The isolated port of the input port of the first parallel coupled line directional coupler and the second parallel coupled line directional coupler is respectively as input and the output of the absorption band pass filter of microstrip line.
The coupling port of the first parallel coupled line directional coupler is connected with for absorbing decline 50 Ω matched loads of the out of band signal reflecting with combline bandpass filter of first, second reflection, and this matched load is connected between the first parallel coupled line directional coupler and ground connection; The straight-through port of the second parallel coupled line directional coupler is connected with the 50 Ω matched loads for absorbing the signal that leaks into this straight-through port, and this matched load is connected between the second parallel coupled line directional coupler and ground connection.
Signal is from the input port input of the first parallel coupled line directional coupler, logical inband signaling after the first parallel coupled line location coupler main channel is divided equally through two identical reflections band combline bandpass filter (be first, second reflection decline band combline bandpass filter) that declines, in the isolated port stack output of the second parallel coupled line directional coupler, and resistance inband signaling is reflected to decline and is reflected back the coupling port stack output of the first parallel coupled line directional coupler and is absorbed by matched load with combline bandpass filter.The passband of the absorption band pass filter of microstrip line of the present invention mainly determines by reflective combline bandpass filter, and Absorber Bandwidth is mainly determined by the bandwidth of parallel coupled line directional coupler.
The feature of absorbing mode filter is on optional frequency, input has good standing-wave ratio, signal in passband can be loss-free by filter, the signal outside the passband consumption original paper matched load that has in filtered device absorbs, thereby has avoided being reflected back toward input.
Parallel coupled line directional coupler of the present invention and reflection decline and are with combline bandpass filter to belong to prior art products, and those skilled in the art can understand and understand, and does not repeat them here.Innovative point of the present invention is in conjunction with the two, forms the absorption band pass filter of microstrip line.
Microstrip line proposed in nineteen fifty-two, be now people the most familiar and in MICs the most general transmission line of application, because it have cheapness, volume little, there is critical coupling and critical cut-off frequency, easily and active device integrated, reproducible in production, and with the advantage such as monolithic integrated microwave circuit (MMICs) is compatible good.On the other hand, its volume of microstrip line comb filter is little, compact conformation, image frequency from passband away from, it is more than 4 times that the centre frequency of the first parasitic passband of comb filter is main passband central frequency.The present invention has adopted microstrip line compatible and microstrip line comb filter has advantages of.
Embodiment mono-
The parallel coupled line directional coupler of the present embodiment is selected parallel coupled line 3dB directional coupler, parallel coupled line coupler and reflection decline and are with combline bandpass filter to form by microstrip line, first, second parallel coupled line directional coupler of the present embodiment is identical, as shown in Figure 2, circuit layout as shown in Figure 3 for the structural representation of parallel coupled line 3dB directional coupler.First, second reflection declines and is with combline bandpass filter identical, reflection declines band combline bandpass filter structural representation as shown in Figure 4, circuit layout as shown in Figure 5, as shown in Figure 1, circuit layout as shown in Figure 6 for the absorption bandpass filter structures schematic diagram of microstrip line being made up of the present embodiment.
Parallel coupled line 3dB directional coupler of the present invention and reflection decline and are with combline bandpass filter to belong to prior art products, and those skilled in the art can understand and understand, and does not repeat them here.Innovative point of the present invention is in conjunction with the two, forms the absorption band pass filter of microstrip line.
First reflection of the present embodiment declines and connects the straight-through port of the first parallel coupled line 3dB directional coupler with the input port of combline bandpass filter, and the first reflection declines and connects the input port of the second parallel coupled line 3dB directional coupler with the output port of combline bandpass filter; The second reflection declines and connects the isolated port of the first parallel coupled line 3dB directional coupler with the input port of combline bandpass filter, and the second reflection declines and connects the coupling port of the second parallel coupled line 3dB directional coupler with the output port of combline bandpass filter; The isolated port of the input port of the first parallel coupled line 3dB directional coupler and the second parallel coupled line 3dB directional coupler is respectively as input and the output of the absorption band pass filter of microstrip line.The coupling port of the first parallel coupled line 3dB directional coupler is connected with for absorbing decline 50 Ω matched loads of the out of band signal reflecting with combline bandpass filter of first, second reflection, and this matched load is connected between the first parallel coupled line 3dB directional coupler and ground connection; The straight-through port of the second parallel coupled line 3dB directional coupler is connected with the 50 Ω matched loads for absorbing the signal that leaks into this straight-through port, and this matched load is connected between the second parallel coupled line 3dB directional coupler and ground connection.
Carry out result that emulation obtains as shown in Figure 7 by Microwave simulation software AWR, the circuit boards adopting when emulation of the present invention is Rogers4350, and dielectric constant is 3.36, and substrate thickness is 1mm, the thickness of conduction band is 0.025mm, adopts the form of microstrip line to realize absorption band pass filter.Wherein Rogers4350 is conventional high-frequency circuit board.
Because the input port of the first parallel coupled line directional coupler and the isolated port of the second parallel coupled line directional coupler are respectively as input and the output of the absorption band pass filter of microstrip line, what therefore the S11 in Fig. 7, S41 submeter represented is the S parameter of input of the present invention and output, S11, S41, VSWR are the characterisitic parameter of filter, it is the parameter of the unified standard of this area, those skilled in the art can understand and understand, and does not repeat them here.
As can be seen from Figure 7 to have realized passband central frequency be 4GHz to the present embodiment, three dB bandwidth is the absorption band pass filter of 745MHz, and input has good standing-wave ratio, passband standing internal wave ratio is less than 1.7, in passband, Insertion Loss is less than 3dB, can find out that the present invention possesses the characteristic of absorbing mode filter, the standing-wave ratio outside passband is less than 6, and the outer standing wave of conventional reflection-type bandpass filter passband can be very large.
Claims (5)
1. the absorption band pass filter of microstrip line, is characterized in that, comprises that the first parallel coupled line is determined coupler, the second parallel coupled line directional coupler, first reflects the band combline bandpass filter and second that declines and reflects the band combline bandpass filter that declines; The first reflection declines and connects the straight-through port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the first reflection declines and connects the input port of the second parallel coupled line directional coupler with the output port of combline bandpass filter; The second reflection declines and connects the isolated port of the first parallel coupled line directional coupler with the input port of combline bandpass filter, and the second reflection declines and connects the coupling port of the second parallel coupled line directional coupler with the output port of combline bandpass filter; The isolated port of the input port of the first parallel coupled line directional coupler and the second parallel coupled line directional coupler is respectively as input and the output of the absorption band pass filter of microstrip line.
2. the absorption band pass filter of microstrip line according to claim 1, it is characterized in that, the coupling port of described the first parallel coupled line directional coupler is connected with for absorbing the decline matched load of the out of band signal reflecting with combline bandpass filter of first, second reflection.
3. the absorption band pass filter of microstrip line according to claim 2, is characterized in that, the straight-through port of described the second parallel coupled line directional coupler is connected with the matched load for absorbing the signal that leaks into this straight-through port.
4. the absorption band pass filter of microstrip line according to claim 3, is characterized in that, described matched load is 50 Ω resistance.
5. the absorption band pass filter of microstrip line according to claim 4, is characterized in that, described first, second parallel coupled line directional coupler is parallel coupled line 3dB directional coupler.
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| CN201410189323.XA CN103928732A (en) | 2014-05-07 | 2014-05-07 | Micro-strip line absorption band-pass filter |
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Cited By (10)
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| CN104538711A (en) * | 2014-09-13 | 2015-04-22 | 南京理工大学 | Miniature microwave and millimeter wave I/Q filter |
| CN105978522A (en) * | 2016-05-04 | 2016-09-28 | 电子科技大学 | Absorption-type band pass filter assembly |
| CN107688131A (en) * | 2016-08-06 | 2018-02-13 | 国基电子（上海）有限公司 | MIMO antenna system |
| CN107910622A (en) * | 2017-10-11 | 2018-04-13 | 南京邮电大学 | Areflexia band logical and low-pass filter based on transmission line structure |
| CN109244608A (en) * | 2018-09-04 | 2019-01-18 | 南京理工大学 | Highly selective narrowband reflectionless filter based on duplexer principle |
| CN110679033A (en) * | 2017-05-11 | 2020-01-10 | 伊根图有限公司 | Compact band-pass filter |
| CN112332061A (en) * | 2020-09-18 | 2021-02-05 | 西安益翔航电科技有限公司 | Design method of miniaturized stopband selectable microstrip 3dB coupler |
| CN113261156A (en) * | 2018-12-28 | 2021-08-13 | 谷歌有限责任公司 | Attenuator for qubit drive signals |
| CN115020952A (en) * | 2022-08-08 | 2022-09-06 | 电子科技大学 | Miniaturized plane matching load |
| CN116937093A (en) * | 2023-09-15 | 2023-10-24 | 南京邮电大学 | Novel broadband reflection-free band-pass filter |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538711B (en) * | 2014-09-13 | 2017-05-17 | 南京理工大学 | Miniature microwave and millimeter wave I/Q filter |
| CN104538711A (en) * | 2014-09-13 | 2015-04-22 | 南京理工大学 | Miniature microwave and millimeter wave I/Q filter |
| CN105978522B (en) * | 2016-05-04 | 2019-05-10 | 电子科技大学 | A kind of absorption bandpass filtering device assembly |
| CN105978522A (en) * | 2016-05-04 | 2016-09-28 | 电子科技大学 | Absorption-type band pass filter assembly |
| CN107688131A (en) * | 2016-08-06 | 2018-02-13 | 国基电子（上海）有限公司 | MIMO antenna system |
| CN110679033A (en) * | 2017-05-11 | 2020-01-10 | 伊根图有限公司 | Compact band-pass filter |
| CN107910622A (en) * | 2017-10-11 | 2018-04-13 | 南京邮电大学 | Areflexia band logical and low-pass filter based on transmission line structure |
| CN107910622B (en) * | 2017-10-11 | 2019-06-25 | 南京邮电大学 | The resistance of areflexia band and low-pass filter based on transmission line structure |
| CN109244608A (en) * | 2018-09-04 | 2019-01-18 | 南京理工大学 | Highly selective narrowband reflectionless filter based on duplexer principle |
| CN113261156A (en) * | 2018-12-28 | 2021-08-13 | 谷歌有限责任公司 | Attenuator for qubit drive signals |
| CN113261156B (en) * | 2018-12-28 | 2022-06-28 | 谷歌有限责任公司 | Attenuator for qubit drive signals |
| CN112332061A (en) * | 2020-09-18 | 2021-02-05 | 西安益翔航电科技有限公司 | Design method of miniaturized stopband selectable microstrip 3dB coupler |
| CN115020952A (en) * | 2022-08-08 | 2022-09-06 | 电子科技大学 | Miniaturized plane matching load |
| CN116937093A (en) * | 2023-09-15 | 2023-10-24 | 南京邮电大学 | Novel broadband reflection-free band-pass filter |
| CN116937093B (en) * | 2023-09-15 | 2023-11-21 | 南京邮电大学 | Broadband reflection-free band-pass filter |
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