CN102354779B - Miniaturized tunable bandstop filter - Google Patents
Miniaturized tunable bandstop filter Download PDFInfo
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- CN102354779B CN102354779B CN2011102981732A CN201110298173A CN102354779B CN 102354779 B CN102354779 B CN 102354779B CN 2011102981732 A CN2011102981732 A CN 2011102981732A CN 201110298173 A CN201110298173 A CN 201110298173A CN 102354779 B CN102354779 B CN 102354779B
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Abstract
The invention relates to a miniaturized tunable bandstop filter, which belongs to the technical field of microwave communication. The filter comprises three parts, i.e. a coplanar waveguide transmission line, a defected ground unit and realization of tunable bandstop, wherein the defected ground unit is formed by two square ring resonator structures etched on grounded units at two sides of the coplanar waveguide transmission line, and the tunable bandstop is realized through a variable capacitance diode across the outside square ring resonator structure and applied direct-current bias. The miniaturized tunable bandstop filter provided by the invention has the advantages of small size, simple structure, large internal inhibition in a stop band, large tuning range of bandstop, easiness in integration with other radio frequency circuits and the like.
Description
Technical field
The present invention relates to a kind of Miniaturized tunable bandstop filter, belong to technical field of micro communication, can be applicable to the signal filtering in super broad band radio communication system, wideband radar system.
Background technology
Appearance in succession along with wireless communication systems such as GSM, WLAN, UWB, available frequency spectrum is very limited, for improving the performance of existing and following wireless system, tunable band-stop filter is paid close attention to widely and is played an important role in wireless communication system.Such as, very wide frequency spectrum of the UWB Technology Need continued to bring out, but limited frequency spectrum resource is often used for a plurality of occasions, this just means exist a large amount of unwanted signals in the UWB wireless communication system, and this signal, along with the variation of when and where may constantly change, has disturbed the useful signal in the UWB system scope.Thereby a solution of the problems referred to above is exactly to introduce the interference signal changed in electric tunable band-stop filter filtering appts in the passband of UWB band pass filter.
Due to the Slow-wave effect of defect ground structure and the remarkable characteristic such as stopband, in recent years, utilized the variable capacitance diode of adjustable defect ground resonance structure and loading to become a kind of effective ways of realizing Miniaturized tunable bandstop filter.Consider that all conductors of co-planar waveguide all are positioned at same plane, for the installation of connection in series-parallel lamped element provides a great convenience this advantage, the defect ground structure based on co-planar waveguide realizes that tunable band-stop filter will have clear superiority.
Through the literature search to prior art, find, in September, 2006, the people such as Amr M.E.safwat was at IEEE Transactionon Microwave Theory and Techniques, the 9th phase of 54 volumes has been delivered " Tunable bandstop defected ground structure resonator using reconfigurable dumbbell-shaped coplanar waveguide (utilizing configurable dumbbell shape co-planar waveguide to realize tunable band-stop defect ground resonator) ", this paper has proposed a kind of improved co-planar waveguide dumbbell shape defect ground resonance structure and has utilized on this basis variable capacitance diode to realize tunable band-stop, but the miniaturization of this tunable band-stop filter and larger band resistance adjustable range still need further research.
In retrieval, also find, in July, 2010, the people such as Heba B.E1-shaarawy delivered " Anovel compact reconfigurable defected ground structure resonatoron coplanar waveguide technology for filter applications (a kind of configurable co-planar waveguide defect ground structure of novel compact resonator that can be applicable to filter) " on IEEE Antennas and Propagation Society International Symposium, this paper has proposed a kind of adjustable band resistance filter of compactness, but one and two band resistances appear respectively in this configurable defect ground structure when diode current flow and cut-off, and because the biasing of the diode direct-current under this configuration mode is difficult to implement, paper does not provide the adjustable extent of band resistance, below all limited the practical application of this filter, simultaneously, its miniaturization also needs to further consider.
Summary of the invention
The deficiency and the defect that for above-mentioned prior art, exist, the present invention proposes a kind of Miniaturized tunable bandstop filter, with overcome existing large based on co-planar waveguide defect ground structure tunable band-stop filter size, band resistance adjustable extent is less and the difficult shortcoming such as apply of direct current biasing.
The Miniaturized tunable bandstop filter that the present invention proposes, element three parts that comprise coplanar waveguide transmission line, defect unit, ground and accommodation zone resistance, is characterized in that coplanar waveguide transmission line consists of the ground unit [2] of the center conductor band [1] on dielectric layer [10] and both sides, unit, defect ground is comprised of two square loop resonance structures that are etched on coplanar waveguide transmission line both sides ground units [2], wherein the square loop resonance structure [3] in the outside is connected with the gap slot of ground unit [2] formation by first vertical breach [11] and co-planar waveguide center conductor band [1], and the outside square loop resonance structure [3] that the square loop resonance structure [4] of inboard passes through second vertical breach [12] and distance center conductor belt [1] horizontal edge farthest is connected, the element of accommodation zone resistance is variable capacitance diode [5], it is across on outside square loop resonance structure [3], its direct current biasing is implemented by interpolation the first bias pad [6] and the second bias pad [7] in the etched rectangular element of co-planar waveguide both sides ground units [2] edge, the second bias pad [7] is through wire [8] and interior outside square loop resonance structure [3, 4] metal derby between is connected, the first bias pad [6] connects outside direct current input, two bias pad [6, 7] by radio-frequency choke [9], connect, to stop the phase mutual interference between radiofrequency signal and direct current signal.
The width of interior outside square loop resonance structure [3,4], first vertical breach [11] and second vertical breach [12] in unit, described defect ground should equate, to reduce electromagnetic wave, in this unit, defect ground, propagates the loss caused due to impedance discontinuity.
Described Miniaturized tunable bandstop filter can reach lower resonance frequency by increasing inboard square loop resonance structure [4] size, thereby further realizes that miniaturization is to meet actual application demand.
The band resistance adjustable extent of described Miniaturized tunable bandstop filter depends on the capacitance variations scope of selected variable capacitance diode.
The Miniaturized tunable bandstop filter that the inner space of the present invention by taking full advantage of modified model dumbbell shape defect ground structure and coplanar waveguide transmission line intrinsic advantage realize, there is stopband and insert the advantages such as loss is little, the interior inhibition of stopband is large, band resistance adjustable extent is large, simple in structure, direct current biasing easily applies outward, and this filter size is little, be very beneficial for super broad band radio communication system, width radar system in other radio circuit integrated, for its practical application has increased facility.
The accompanying drawing explanation
Fig. 1 is the Facad structure schematic diagram of Miniaturized tunable bandstop filter of the present invention.
Fig. 2 is the overall structural representation of Miniaturized tunable bandstop filter of the present invention.
Fig. 3 is that Miniaturized tunable bandstop filter of the present invention is 0.5pF in varactor capacitance, the transmission coefficient of emulation and frequency relation figure when 2.0pF and 6.5pF.
Fig. 4 is that Miniaturized tunable bandstop filter of the present invention is 0.5pF in varactor capacitance, the reflection coefficient of emulation and frequency relation figure when 2.0pF and 6.5pF.
Embodiment
The Miniaturized tunable bandstop filter that the present invention proposes, as shown in Figure 1, its general structure schematic diagram as shown in Figure 2 for the Facad structure layout of an embodiment.
Coplanar waveguide transmission line in Fig. 1 and Fig. 2 consists of the ground unit [2] of the center conductor band [1] on dielectric layer [10] and both sides.Center conductor band [1] is determined by required characteristic impedance with the gap slot width of ground unit [2] formation of both sides, is depended on the dielectric constant of dielectric layer [10] and the width of thickness and center conductor band [1].In the present embodiment, the dielectric constant of dielectric layer [10] is 9.6, and thickness is 0.8mm, and the width of center conductor band [1] is 3mm, and for reaching the characteristic impedance of 50 ohm, the gap slot width is chosen as 0.8mm.
Unit, defect ground in Fig. 1 and Fig. 2 is comprised of two square loop resonance structures that are etched on coplanar waveguide transmission line both sides ground units [2], wherein the square loop resonance structure [3] in the outside is connected with the gap slot of ground unit [2] formation by first vertical breach [11] and co-planar waveguide center conductor band [1], and the outside square loop resonance structure [3] that the square loop resonance structure [4] of inboard passes through second vertical breach [11] and distance center conductor belt [1] horizontal edge farthest is connected.The improved dumbbell shape defect ground structure of comparing, this unit, defect ground increases the electromagnetic wave propagation path by introducing inboard square loop resonance structure [4], thereby realize miniaturization, and the increase along with inboard square loop resonance structure [4] length of side, the resonance frequency of unit, defect ground will further reduce, thereby reach further miniaturization to meet actual application demand.The width of the width of interior outside square loop resonance structure [3,4] and vertical breach [11,12] should be selected to equate, to reduce electromagnetic wave, in this unit, defect ground, propagates the energy loss caused due to impedance discontinuity.The size of interior outside square loop resonance structure [3,4] and vertical breach [11,12] can require according to the specific design of filter definite, and this total average perimeter in defect unit, ground is about half of the corresponding guide wavelength of its resonance frequency.In this embodiment, the length of side of outside square loop resonance structure [3] is 8mm, the length of side of inboard square loop resonance structure [4] is 3mm, length and the width of the width of square loop and vertical breach all are chosen as 0.5mm, the miniaturization defect that obtains ground unit resonance frequency is 2.52GHz, and now common modified model dumbbell structure defect ground unit resonance frequency is 2.92GHz.When the length of side of miniaturization defect ground unit inside square loop resonance structure [4] increases to 6mm, with common unit, modified model dumbbell structure defect ground, compare, can obtain 55.1% size reduction.
The element of accommodation zone resistance is variable capacitance diode [5], it is across on outside square loop resonance structure [3], its direct current biasing is implemented by interpolation the first bias pad [6] and the second bias pad [7] in the etched rectangular element of co-planar waveguide both sides ground units [2] edge, the second bias pad [7] is through wire [8] and interior outside square loop resonance structure [3, 4] metal derby between is connected, the first bias pad [6] connects outside direct current input, two bias pad [6, 7] by radio-frequency choke [9], connect, to stop the phase mutual interference between radiofrequency signal and direct current signal.The adjustable extent of band resistance depends on the capacitance variations scope of selected variable capacitance diode.Etched rectangular element size mainly depends on the radio-frequency choke package dimension size of selection, and this rectangular element should be as far as possible little of the radiation loss that reduces filter and the impact that defect ground unit resonance frequency is caused.In this embodiment, the size of rectangular element is 8mm*3mm; Radio-frequency choke is encapsulated as 1206, and size is 47 μ H; Variable capacitance diode is upper apart from the outside square loop resonance structure [3] at gap slot 1.5mm place across on the left side, and when this diode changes from 1V to 28V at reversed bias voltage, the capacitance variations scope is 0.5pF-6.5pF; The size of whole tunable band-stop filter is 25mm*40mm.
The Miniaturized tunable bandstop filter that Fig. 3 and Fig. 4 have provided respectively the present invention's proposition is 0.5pF in varactor capacitance, the transmission coefficient of emulation and frequency relation figure and reflection coefficient and frequency relation figure when 2.0pF and 6.5pF.From two figure, all can find out, variation along with varactor capacitance, variation has also occurred in the stopband center frequency of this tunable band-stop filter, be respectively 2.30GHz, 1.94GHz and 1.75GHz, the adjustable extent of band resistance is 0.55GHz, reached 27.2% of its centre frequency, and maximum the inhibition for 35dB in stopband.By increasing the capacitance variations scope of variable capacitance diode, the adjustable extent of this band stop filter can further increase.
Although describe the present invention on the basis of above-described embodiment, the present invention is not limited thereto, the people with association area background knowledge can carry out various deformation on this basis.For example, can be by variable capacitance diode across on the square loop resonance structure inboard, realizing new tunable band-stop.Therefore, this distortion and other thought according to the invention, within all should belonging to protection scope of the present invention.
Claims (4)
1. a Miniaturized tunable bandstop filter, comprise element three parts that coplanar waveguide transmission line, defect unit, ground and accommodation zone hinder, and it is characterized in that coplanar waveguide transmission line consists of the ground unit [2] of the center conductor band [1] on dielectric layer [10] and both sides, unit, defect ground is comprised of two square loop resonance structures that are etched on coplanar waveguide transmission line both sides ground units [2], wherein the square loop resonance structure [3] in the outside is connected with the gap slot of ground unit [2] formation by first vertical breach [11] and co-planar waveguide center conductor band [1], and the outside square loop resonance structure [3] that the square loop resonance structure [4] of inboard passes through second vertical breach [12] and distance center conductor belt [1] horizontal edge farthest is connected, the element of accommodation zone resistance is variable capacitance diode [5], it is across on outside square loop resonance structure [3], its direct current biasing is implemented by interpolation the first bias pad [6] and the second bias pad [7] in the etched rectangular element of co-planar waveguide both sides ground units [2] edge, the second bias pad [7] is through wire [8] and interior outside square loop resonance structure [3, 4] metal derby between is connected, the first bias pad [6] connects outside direct current input, two bias pad [6, 7] by radio-frequency choke [9], connect, to stop the phase mutual interference between radiofrequency signal and direct current signal.
2. Miniaturized tunable bandstop filter according to claim 1, the width that it is characterized in that interior outside square loop resonance structure [3,4], first vertical breach [11] and second vertical breach [12] in unit, defect ground should equate, to reduce electromagnetic wave, in this unit, defect ground, propagates the energy loss caused due to impedance discontinuity.
3. Miniaturized tunable bandstop filter according to claim 1, is characterized in that can reaching lower resonance frequency by increasing inboard square loop resonance structure [4] size, thereby further realize that miniaturization is to meet actual application demand.
4. Miniaturized tunable bandstop filter according to claim 1, is characterized in that being with the adjustable extent hindered to depend on the capacitance variations scope of selected variable capacitance diode.
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| CN2011102981732A CN102354779B (en) | 2011-09-30 | 2011-09-30 | Miniaturized tunable bandstop filter |
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| CN2011102981732A CN102354779B (en) | 2011-09-30 | 2011-09-30 | Miniaturized tunable bandstop filter |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943919B (en) * | 2014-04-23 | 2016-06-01 | 西南交通大学 | The variable band-pass filter of a kind of constant bandwidth |
| CN105226356B (en) * | 2015-10-03 | 2018-03-06 | 上海大学 | Tunable filter design based on defect ground structure |
| CN105680126A (en) * | 2015-12-30 | 2016-06-15 | 联想(北京)有限公司 | Filter adjustment method, filter and electronic equipment |
| DE102016105828A1 (en) | 2015-12-30 | 2017-07-06 | Lenovo (Beijing) Limited | Filter and electronic device |
| CN105789742B (en) * | 2016-05-30 | 2018-09-11 | 北京邮电大学 | A kind of co-planar waveguide Wide stop bands filter |
| CN107768783B (en) * | 2017-10-19 | 2020-09-11 | 河北工程大学 | Square annular filter |
| CN108963396B (en) * | 2018-06-26 | 2020-02-18 | 东南大学 | Miniaturized liquid crystal adjustable microwave narrow-band-stop filter and processing method thereof |
| CN109244611B (en) * | 2018-08-30 | 2020-07-07 | 成都频岢微电子有限公司 | Miniaturized adjustable substrate integrated waveguide filter |
| CN110034363B (en) * | 2019-04-04 | 2021-01-15 | 电子科技大学 | Microwave electrically tunable band-stop filter based on terminal open-circuit microstrip line structure |
| CN113611992B (en) * | 2021-05-07 | 2022-07-15 | 电子科技大学 | High-frequency reconfigurable microstrip band-pass filter |
| CN113285188B (en) * | 2021-05-27 | 2022-01-28 | 重庆邮电大学 | Coplanar waveguide band-pass filter with reconfigurable pass band |
| CN114927841B (en) * | 2022-05-20 | 2023-09-08 | 重庆邮电大学 | Reconfigurable filter based on complementary split ring and SIW structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101931114A (en) * | 2009-09-08 | 2010-12-29 | 北京邮电大学 | Asymmetric DGS (Defected Ground Structure) structure cascaded filter |
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| CN101794926A (en) * | 2010-03-26 | 2010-08-04 | 华东交通大学 | Band-pass filter based on pentagon closed loop resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101931114A (en) * | 2009-09-08 | 2010-12-29 | 北京邮电大学 | Asymmetric DGS (Defected Ground Structure) structure cascaded filter |
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