CN109687066B - A kind of miniature ultra wide band plane bandstop filter - Google Patents
A kind of miniature ultra wide band plane bandstop filter Download PDFInfo
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- CN109687066B CN109687066B CN201811634589.5A CN201811634589A CN109687066B CN 109687066 B CN109687066 B CN 109687066B CN 201811634589 A CN201811634589 A CN 201811634589A CN 109687066 B CN109687066 B CN 109687066B
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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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
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Abstract
The invention discloses a kind of miniature ultra wide band plane bandstop filters comprising the grounded metal floor of the metal micro-strip line and patch capacitor on upper layer, the micro-strip dielectric-slab of middle layer and bottom；Wherein metal micro-strip line includes a pair of symmetrical input/output feeder line, interdigitation port capacitor, the first and second stepped impedance type coupling lines, and patch capacitor bridging load is on the coupling line of end short circuit.Two coupling lines are connected with the gradual change port of input/output feeder line respectively, and are mutually perpendicular to feeder line.The size of port capacitor is adjusted by changing the interdigital length of port capacitor and interval, and then changes the number of transmission zero or position in stopband, changes the position of two low-frequency transmission zero points in stopband by changing patch capacitor value.Compared with prior art, size of the present invention is small, while having the characteristic of ultra-wide stopband, can be very good to apply in broadband system.
Description
Technical field
The present invention relates to a kind of miniature ultra wide band plane bandstop filters, belong to microwave technical field, can be used for broadband
In reception system and the application inhibited to microwave interference signal.
Background technique
Bandstop filter plays important role in modern wireless communication systems, and which are mainly applied to inhibit communication system
Unwanted signal in system, for example, second harmonic can be contained when high power amplifier saturation output, it can be to late-class circuit
Interference is generated, so that useful signal will generate distortion.Therefore, bandstop filter plays important work to the highly attenuating of designated frequency band
With.
The characteristics of miniaturization of bandstop filter, Wide stop bands and planarization, has pushed its application.As future device is got over
Carry out more High Density Integration, the miniaturization of device is the only way which must be passed of future device and microwave system development, certainly, bandstop filter
It is no exception.Meanwhile the stability in order to ensure wide-band communication system, then there is high-performance in the band limits of ultra-wide
The bandstop filter of harmonics restraint be essential.For cavity strip line, micro-strip planar structure is a kind of normal
The microwave circuit seen realizes structure, there is processing to realize convenient, at low cost, the advantages that being easy in conjunction with active device.Therefore, small
The plane bandstop filter of type ultra wide band is identical the requirement of Modern wireless communication device design, especially at hand
The 5th third-generation mobile communication technology in, will have big advantage.
Traditional plane bandstop filter generally using cascade open a way minor matters by the way of, relative bandwidth with series increasing
Add and increase, inevitably increase the size of device in this way, for example, quadravalence bandstop filter needs four a quarters length
It opens a way minor matters (non-transmitting direction length is about a quarter waveguide wavelength) and three quarter-wave admittance converts
Device (transmission direction length is about 3/4ths waveguide wavelengths), the relative bandwidth realized is about 50%~70% (in stopband
Insertion loss is above 20dB), meanwhile, this traditional scheme it is computationally intensive, implement complex.By above-mentioned analysis
It is found that the plane bandstop filter of miniaturization and ultra wide band is the direction of future development, still, how to pass through small size, letter
Single structure realizes that the band-stop response of ultra wide band and good stopband inhibit, is currently still a design difficulty and challenge.
Summary of the invention
Goal of the invention: being directed to the above-mentioned problems in the prior art, and object of the present invention is to propose that a kind of structure is simple, easy
In the miniature ultra wide band plane bandstop filter of realization, realize that the band-stop response of ultra wide band and good stopband inhibit.
Technical solution: the purpose of the invention will be achieved through the following technical solutions:
A kind of miniature ultra wide band plane bandstop filter, metal micro-strip line and patch capacitor including upper layer, middle layer
Micro-strip dielectric-slab and lower layer grounding plate；The metal micro-strip line includes a pair of of input/output feeder line, port electricity
Appearance, the first coupling line and the second coupling line；
The input/output feeder line is end tapered transmission lines, and is in together on same center line；
The port capacitor using interdigital structure realize, load on the gradual change end of input/output feeder line, and with it is defeated
Enter/output feeder is parallel to each other；
First coupling line and the second coupling line are stepped impedance type microstrip transmission line, and stepped impedance characteristic is by slotting
Structure realizes that coupling is formed by gap；First coupling line and the second coupling line are connected, the other end respectively with input/defeated
The gradual change end of feeder line is connected and is mutually perpendicular to input/output feeder line out；
The patch capacitor is between the first coupling line and the gap of the second coupling line.
As a further optimization solution of the present invention, the electrical length of first coupling line and the second coupling line is four points
One of wavelength.
As a further optimization solution of the present invention, the stepped impedance characteristic of first coupling line and the second coupling line is equal
It is realized by notching construction, and the size slotted is all the same.
As a further optimization solution of the present invention, port electricity is adjusted by changing the interdigital length of port capacitor and interval
The size of appearance, and then change the number of transmission zero or position in stopband.
As a further optimization solution of the present invention, change two low-frequency transmissions in stopband by changing the value of patch capacitor
The position of zero point.
As a further optimization solution of the present invention, the type of fade at the gradual change end of the input/output feeder line is triangle
Type or camber.
The utility model has the advantages that the present invention is compared with the prior art, there is following significant technical effect:
One, a kind of miniature ultra wide band plane bandstop filter proposed by the invention, have size it is small, it is easy to process and at
This low advantage.
Two, a kind of miniature ultra wide band plane bandstop filter proposed by the invention, stopband is very wide, and in a cycle
Transmission zero there are four including, is conducive to apply in broadband system.
Detailed description of the invention
Fig. 1 is the perspective view of the embodiment of the present invention；
Fig. 2 is the top view of the embodiment of the present invention；
Fig. 3 is emulation and the practical frequency response curve of the embodiment of the present invention.
In figure: 1- grounding plate, 2- micro-strip dielectric-slab, 3- metal micro-strip line, 4- input/output feeder line, the port 5- electricity
Hold, 6- gradual change end, the first coupling line of 7-, 8- notching construction, the second coupling line of 9-, 10- patch capacitor, the gap 11-, the end 12-
Short-circuit structure.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
As shown in Figure 1, a kind of miniature ultra wide band plane bandstop filter disclosed by the embodiments of the present invention, including bottom
Grounding plate 1, the micro-strip dielectric-slab 2 of middle layer and the circuit knot being made of metal micro-strip line 3 and patch capacitor 10 on upper layer
Structure.As shown in Fig. 2, metal micro-strip line 3 includes the first coupling line 7, the second coupling line 9, interdigitation port capacitor 5 and a pair of of port
The input/output feeder line 4 of gradual change.A pair of of input/output feeder line 4 is in the same center line, two end of coupling line 7 and 9 phases
Even, the other end is connected with the gradual change end 6 of feeder line 4 respectively, and is mutually perpendicular to feeder line 4.The gradual change end 6 of feeder line 4 can be used three
Angle-style gradual change is also possible to the gradual change of other forms, such as camber gradual change.
In order to realize the characteristic of Wide stop bands and miniaturization, patch capacitor 10 is added between two coupling lines 7 and 9, wherein
The design of coupling line, firstly, circuit simulating software ADS calculates the parity mode impedance of ideal coupled transmission line, meanwhile, set its electricity
Length is quarter-wave, but there is a situation where that parity mode phase velocity differs in microstrip structure, therefore, in microstrip structure
Coupled transmission line use stepped impedance type transport-type, stepped impedance characteristic realized by notching construction 8, is passed through and is changed fluting
Interval between size and two slots guarantees the characteristic one of the transmission characteristic of coupling line 7 and 9 and Ideal Transmission Line in micro-strip
Sample.And patch capacitor 10 is loaded between coupling line 7 and 9 can form two transmission zeros in stopband, change patch capacitor
10 size changes the position of transmission zero, meanwhile, transmission line loading capacitance can minimize, and therefore, patch electricity be added
Hold 10 and clearly reduces the size with resistance resonator.
In order to further expand the bandwidth of stopband, it is found that port capacitor 5 effectively introduces one or two transmission
Zero point, due to this capacitance be not it is very big, do not use the patch capacitor of lump, but use distributed interdigital
Capacitor.In order to further illustrate the relationship of port interdigital capacitor and transmission zero, without loss of generality, obtained by theoretical calculation:
f0=1Hz (normalization band resistance centre frequency is 1Hz), C1=0.752F (patch capacitor 10), ye=0.5607S (the first and second coupling
The even mould admittance of zygonema), yo=1.089S (the odd mould admittance of the first and second coupling line),(first or
Second coupling line obtains electrical length), it is obtained by following formula,
Wherein, C2It is port capacitance, y '21It is not load C2When transmission admittance,It is C2Transmission admittance.Pass through
Analysis to the design formula changes capacitance C2The number and dead-center position to the transmission zero of bandstop filter may be implemented
It is controlled.Work as C2There are three transmission zero transmission zeros, that is, port capacitor 5 to provide when=0.03044F, in stopband
One transmission zero；Work as C2When > 0.03044F, there are two transmission zero transmission zeros in stopband, then port capacitor 5 does not produce
Raw transmission zero；Only work as C2> 0.03044F, while cannot be excessive, such port capacitor 5 can at most provide two transmission zero
Point.Also, after load port capacitor 5, the interval of two transmission zeros originally can become larger.
As shown in Fig. 3 the emulation of bandstop filter and practical frequency response curve.It can find Electromagnetic Simulation frequency
Curve matches substantially with measured curve, and in the frequency curve of actual measurement, and there are four transmission zeros in stopband, while being inserted into damage
Consumption is 1.94GHz-6.63GHz (relative bandwidth 109%) in the band limits of 20dB or more.Experiment show this set
Count the bandwidth of rejection with ultra wide band, excellent rejection characteristic and stable performance.
In conclusion a kind of miniature ultra wide band plane bandstop filter of the invention, can be realized four in stopband
Transmission zero, while its stopband relative bandwidth has reached 109%, can be very good to apply in broadband system.Also, the present invention
Also have small size (size only has 0.06 waveguide wavelength *, 0.46 waveguide wavelength (waveguide wavelength of centre frequency)), it is light-weight, plus
The feature that work is simple and manufacturing cost is low.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from spiritual essence and principle effect of the invention it is lower made by change, modification, substitution, combination, letter
Change, should be equivalent substitute mode, be included within the scope of the present invention.
Claims (6)
1. a kind of miniature ultra wide band plane bandstop filter, which is characterized in that metal micro-strip line (3) and patch including upper layer
Capacitor (10), the micro-strip dielectric-slab (2) of middle layer and the grounding plate (1) of lower layer；The metal micro-strip line (3) includes
A pair of of input/output feeder line (4), port capacitor (5), the first coupling line (7) and the second coupling line (9)；
The input/output feeder line (4) is end tapered transmission lines, and is in together on same center line；
The port capacitor (5) is realized using interdigital structure, loads on the gradual change end (6) of input/output feeder line (4), and
It is parallel to each other with input/output feeder line (4)；
First coupling line (7) and the second coupling line (9) are stepped impedance type microstrip transmission line, and stepped impedance characteristic is by opening
Slot structure (8) realizes that the coupling between the first coupling line (7) and the second coupling line (9) is formed by gap (11)；Described first
Coupling line (7) is connected with one end of the second coupling line (9), the other end respectively with gradual change end (6) phase of input/output feeder line (4)
It is mutually perpendicular to even and with input/output feeder line (4)；
The patch capacitor (4) is between the first coupling line (7) and the gap (11) of the second coupling line (9).
2. miniature ultra wide band plane bandstop filter according to claim 1, which is characterized in that first coupling line
(7) and the electrical length of the second coupling line (9) is quarter-wave.
3. miniature ultra wide band plane bandstop filter according to claim 1, which is characterized in that first coupling line
(7) and the stepped impedance characteristic of the second coupling line (9) passes through notching construction (8) realization, and the size slotted is all the same.
4. miniature ultra wide band plane bandstop filter according to claim 1, which is characterized in that by changing port electricity
Hold (5) interdigital length and interval adjusts the size of port capacitor, and then changes the number of transmission zero or position in stopband.
5. miniature ultra wide band plane bandstop filter according to claim 1, which is characterized in that by changing patch electricity
The value for holding (10) changes the position of two low-frequency transmission zero points in stopband.
6. miniature ultra wide band plane bandstop filter according to claim 1, which is characterized in that the input/output
The type of fade at the gradual change end (6) of feeder line (4) is triangular form or camber.
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| CN201811634589.5A CN109687066B (en) | 2018-12-29 | 2018-12-29 | A kind of miniature ultra wide band plane bandstop filter |
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| CN201811634589.5A CN109687066B (en) | 2018-12-29 | 2018-12-29 | A kind of miniature ultra wide band plane bandstop filter |
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| CN109687066B true CN109687066B (en) | 2019-11-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114628873B (en) * | 2022-03-09 | 2023-08-18 | 南通大学 | Absorption type microstrip line band elimination filter structure |
| CN114824702B (en) * | 2022-05-13 | 2023-12-08 | 南京邮电大学 | Miniaturized ultra-wideband stop band plane band-pass filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256990A (en) * | 1992-05-08 | 1993-10-26 | Skydata, Inc. | Compact, die-cast precision bandstop filter structure |
| CN204407453U (en) * | 2015-02-06 | 2015-06-17 | 中国计量学院 | Open rectangle ring band stop filter |
| CN208272081U (en) * | 2018-04-24 | 2018-12-21 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Rectangle E flank of tooth multiple-grooved band hinders Slab Dielectric Waveguide terahertz filter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101474607B1 (en) * | 2012-10-02 | 2014-12-19 | 충남대학교산학협력단 | Microstrip bandstop filter using open stub |
| CN104821420B (en) * | 2015-04-24 | 2017-10-20 | 华南理工大学 | A kind of restructural two-band bandstop filter |
| CN106785252A (en) * | 2015-11-20 | 2017-05-31 | 王帅 | New resistance filter apparatus |
-
2018
- 2018-12-29 CN CN201811634589.5A patent/CN109687066B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256990A (en) * | 1992-05-08 | 1993-10-26 | Skydata, Inc. | Compact, die-cast precision bandstop filter structure |
| CN204407453U (en) * | 2015-02-06 | 2015-06-17 | 中国计量学院 | Open rectangle ring band stop filter |
| CN208272081U (en) * | 2018-04-24 | 2018-12-21 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Rectangle E flank of tooth multiple-grooved band hinders Slab Dielectric Waveguide terahertz filter |
Non-Patent Citations (3)
| Title |
|---|
| "microswave bandstop filters using novel artificial periodic substrate electromagnetic band gap structures";Felix D. Mbairi et al;《IEEE TRANSACTIONS ON COMPONENTS AND PACKING TECHNOLOGIES》;20090630;第32卷(第2期);第273-282页 * |
| "multiband bandstop filter using an I-stub-loaded meandered defected microstrip structure";Gyan Raj Koirala et al;《Radioengineering》;20160430;第25卷(第1期);第61-66页 * |
| "微带滤波器的时域有限差分仿真研究";高红;《中国优秀硕士学位论文全文数据库》;20040315(第1期);I135-187页 * |
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Application publication date: 20190426 Assignee: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS INSTITUTE AT NANTONG Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980006914 Denomination of invention: A miniaturized ultra wideband planar band stop filter Granted publication date: 20191112 License type: Common License Record date: 20201021 |