CN104600400A - Planar microstrip line tri-band filter - Google Patents
Planar microstrip line tri-band filter Download PDFInfo
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- CN104600400A CN104600400A CN201410850324.4A CN201410850324A CN104600400A CN 104600400 A CN104600400 A CN 104600400A CN 201410850324 A CN201410850324 A CN 201410850324A CN 104600400 A CN104600400 A CN 104600400A
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- microstrip line
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Abstract
The invention relates to a planar microstrip line tri-band filter. The filter comprises two resonators and a medium base plate, wherein the two resonators are oppositely arranged on the medium base plate; the resonators are tri-stepped-impedance resonators, comprise a middle microstrip line in the middle, side microstrip lines at the two sides of the middle microstrip line and end microstrip lines at the two ends of each side microstrip line, and the width of the middle microstrip line, the side microstrip lines and the end microstrip lines which are symmtriclaly arranged is gradually reduced. By adopting the tri-stepped-impedance resonators, the filter can be used for effectively reducing the dimension.
Description
Technical field
The present invention relates to a kind of filter, especially a kind of planar microstrip triple-band filter.
Background technology
Current net data terminate often supports multiple network type, as WLAN (WLAN (wireless local area network)), WiMAX (worldwide interoperability for microwave access) etc., WLAN foundation IEEE802.11b/g/n standard operation is at 2.4-2.4835GHz and 5.15-5.85GHz, WiMAX working frequency range is 3.5GHz, can work in simultaneously the miniaturization of 2.4GHz, 3.5GHz and 5.2GHz, low-loss, high selectivity high performance filter can meet the demand of multiple wireless data service network.
Existing triple-band filter adopts the exponent number increasing filter, i.e. the mode of the multiple resonator of cascade, and this mode filter passband internal loss is large, and stopband suppresses not, and size is large, is unfavorable for the miniaturization of equipment.Therefore researching and developing one takes up room less, and passband internal loss is low, and stopband suppresses large three products filter particularly necessary.
Summary of the invention
The present invention solves the above-mentioned technical problem existed in background technology, and a kind of demand of existing wireless data service network to multiband device that meet is provided, overcoming existing triple-band filter, to lead to in-band insertion loss large, stopband suppresses not enough, take up room more defect, provide a kind of planar microstrip triple-band filter, this filter adopts three joint step impedance resonator, can effectively reduce size.
Technical solution of the present invention is: the present invention is a kind of planar microstrip triple-band filter, and its special character is: described filter comprises resonator and medium substrate, and resonator is two, is oppositely arranged on medium substrate.
Above-mentioned resonator is three joint step impedance resonator, comprise the middle microstrip line being arranged on middle part, be arranged on the limit microstrip line on middle microstrip line both sides and arrange the end microstrip line at microstrip line two ends, limit, the width of described middle microstrip line, limit microstrip line and end microstrip line is successively by wide extremely narrow, symmetrical.
The short microstrip line of rectangle is provided with in the middle of the microstrip line of above-mentioned middle part.
The port of above-mentioned resonator is by being carefully transitioned into thick L-type transition line port.
The L-type transition line port of above-mentioned two resonators is asymmetric setting.
The width microstrip line successively of above-mentioned middle microstrip line, limit microstrip line and end microstrip line is wide is followed successively by 5.28mm, 2.03mm, 0.67mm.
Above-mentioned resonator is bent into C type.
Above-mentioned two resonators being bent into C shape adopt electric coupling mode relatively to put.
The material of above-mentioned medium substrate is polytetrafluoroethylene.
Filter provided by the invention, has the following advantages:
1, the impedance magnitude of microstrip line is relevant with live width, the present invention improves on the basis of half-wavelength uniform impedance resonator, the microstrip line of three kinds of different live widths is combined, form three joint step impedance resonator, fundamental frequency and two parasitic frequencys below thereof can be realized to be configured to three passbands, thus the live width of each section is decided.The present invention simultaneously adopts two three to save step impedance resonator and relatively puts after bending, and compared with conventional method, the few insertion loss of number of resonators is little, disposing way is electric coupling form, contribute to expanding pass band width, strengthen stopband and suppress, and effectively reduce corresponding size.
2, two ports at resonator two ends of the present invention adopt L-type transition line, thick by being carefully transitioned into gradually, realize the coupling of impedance.Two L-type transition line port putting positions are asymmetrical form, contribute to constructing transmission zero in stopband, and the signal compacting in stopband gone down, improve stopband and suppress, the selectivity of filter improves.
In the middle of the middle microstrip line of 3, two C type resonators of the present invention, respectively there is one section of short microstrip line of rectangle for second resonance frequency fine setting, make it accurately be positioned at about 3.5GHz.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that resonator of the present invention adopts three joint step impedance resonator;
Fig. 2 is the structural representation that the present invention is operated in a specific embodiment of 2.4GHz, 3.5GHz and 5.2GHz;
Fig. 3 is the working effect figure of the specific embodiment of the invention.
Description of reference numerals is as follows:
101-middle microstrip line, 102-limit microstrip line, 103-end microstrip line, 104-medium substrate, 105,106-L-type transition line port, 107, the short microstrip line of 108-rectangle.
Embodiment
See Fig. 1, the impedance magnitude of microstrip line is relevant with live width, the resonator that the present invention adopts improves on the basis of half-wavelength uniform impedance resonator, by the microstrip line of three kinds of different live widths, middle microstrip line 101, limit microstrip line 102, end microstrip line 103 combine, be three joint step impedance resonator, fundamental frequency and two parasitic frequencys below thereof can be realized to be configured to three passbands.The ratio of the resistance value of end microstrip line 103 and limit microstrip line 102 is K1, the ratio of the resistance value of limit microstrip line 102 and middle microstrip line 101 is K2, K1 value and K2 value can be calculated by three frequency 2.4GHz, 3.5GHz and 5.2GHz, thus the live width of each section is decided.
See Fig. 2, specific embodiments of the invention are that employing two three joint step impedance resonator is relatively put after being bent into C type, and disposing way is electric coupling form, contributes to expanding pass band width, strengthens stopband and suppresses, and effectively reduce corresponding size.
In the specific embodiment of the invention, resonator is symmetrical, and the middle microstrip line 101 at middle part is the widest, and be secondly the limit microstrip line 102 on both sides, the end microstrip line 103 at two ends is the narrowest.K1 value and K2 value can be calculated by three frequency 2.4GHz, 3.5GHz and 5.2GHz.First the resistance value at setting end microstrip line 103 place is 95 Ω, the resistance value that can calculate limit microstrip line 102 place and middle microstrip line 101 place according to the value of K1 and K2 is thus respectively 52.2 Ω and 24.5 Ω, using relevant electromagnetic computing software can calculate dielectric constant is 2.6, resonance frequency is in 2.4GHz situation, and the microstrip line of middle microstrip line 101, limit microstrip line 102 and end microstrip line 103 is wide is respectively 5.28mm, 2.03mm, 0.67mm.The length of each joint microstrip line is determined by the electrical length θ of its correspondence, in order to the convenience designed, and the electrical length θ 1=2 θ 2=2 θ 3 of microstrip line 101 in order.According to known electric parameter, can be calculated the length of every section of microstrip line by relevant electromagnetic computing software, after final optimization pass, the length of 101,102,103 is 18.77mm, 9.24mm, 10.09mm.
Two ports at resonator two ends adopt L-type transition line port one 05,106, thick by being carefully transitioned into gradually, realize the coupling of impedance.Two L-type transition line port one 05,106 putting positions are asymmetrical form, can be implemented in stopband and add transmission zero, and the signal compacting in stopband gone down, improve stopband and suppress, the selectivity showing as filter improves.
In the middle of the middle microstrip line 101 of two C type resonators, respectively there is one section of short microstrip line 107,108 of rectangle, for second resonance frequency fine setting, make it accurately be positioned at about 3.5GHz.
See Fig. 3, three frequency bands of the present invention are positioned at 2.42GHz, 3.57GHz and 5.39GHz, and the insertion loss of each passband is respectively 0.5dB, 1.24dB and 2.46dB.Construct the transmission zero of stopband attenuation at below-40dB at frequency 2.11GHz, 2.81GHz and 4.31GHz place, meet the requirement that WLAN and WiMAX suppresses for frequency range, Insertion Loss and stopband.This filter is long is 61mm, and wide is 24mm, compared with conventional triple-band filter, effectively reduces and takes up room.
Claims (9)
1. a planar microstrip triple-band filter, is characterized in that: described filter comprises resonator and medium substrate, and described resonator is two, is oppositely arranged on medium substrate.
2. planar microstrip triple-band filter according to claim 1, it is characterized in that: described resonator is three joint step impedance resonator, comprise the middle microstrip line being arranged on middle part, be arranged on the limit microstrip line on middle microstrip line both sides and the end microstrip line at microstrip line two ends, limit is set, the width of described middle microstrip line, limit microstrip line and end microstrip line is successively by wide extremely narrow, symmetrical.
3. planar microstrip triple-band filter according to claim 2, is characterized in that: be provided with the short microstrip line of rectangle in the middle of the microstrip line of described middle part.
4. planar microstrip triple-band filter according to claim 3, is characterized in that: the port of described resonator is by being carefully transitioned into thick L-type transition line port.
5. planar microstrip triple-band filter according to claim 4, is characterized in that: the L-type transition line port of described two resonators is asymmetric setting.
6. planar microstrip triple-band filter according to claim 5, is characterized in that: the width microstrip line successively of described middle microstrip line, limit microstrip line and end microstrip line is wide is followed successively by 5.28mm, 2.03mm, 0.67mm.
7. the planar microstrip triple-band filter according to claim 1 or 2 or 3 or 4 or 5 or 6, is characterized in that: described resonator is bent into C type.
8. planar microstrip triple-band filter according to claim 7, is characterized in that: described two resonators being bent into C shape adopt electric coupling mode relatively to put.
9. planar microstrip triple-band filter according to claim 8, is characterized in that: the material of described medium substrate is polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410850324.4A CN104600400A (en) | 2014-12-30 | 2014-12-30 | Planar microstrip line tri-band filter |
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| CN201410850324.4A CN104600400A (en) | 2014-12-30 | 2014-12-30 | Planar microstrip line tri-band filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024122A (en) * | 2015-07-21 | 2015-11-04 | 天津大学 | Three-passband microstrip filter based on SIR structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425615A (en) * | 2007-11-02 | 2009-05-06 | 海泰超导通讯科技（天津）有限公司 | Step resistance type hair-pin structure resonator and filter thereof |
| CN101662056A (en) * | 2009-09-09 | 2010-03-03 | 华东交通大学 | Tri-frequency microwave bandpass filter |
| CN102637931A (en) * | 2012-04-18 | 2012-08-15 | 南通大学 | Microwave three-passband bandpass filter |
| CN204333187U (en) * | 2014-12-30 | 2015-05-13 | 西安乾易企业管理咨询有限公司 | A kind of planar microstrip triple-band filter |
-
2014
- 2014-12-30 CN CN201410850324.4A patent/CN104600400A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425615A (en) * | 2007-11-02 | 2009-05-06 | 海泰超导通讯科技（天津）有限公司 | Step resistance type hair-pin structure resonator and filter thereof |
| CN101662056A (en) * | 2009-09-09 | 2010-03-03 | 华东交通大学 | Tri-frequency microwave bandpass filter |
| CN102637931A (en) * | 2012-04-18 | 2012-08-15 | 南通大学 | Microwave three-passband bandpass filter |
| CN204333187U (en) * | 2014-12-30 | 2015-05-13 | 西安乾易企业管理咨询有限公司 | A kind of planar microstrip triple-band filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024122A (en) * | 2015-07-21 | 2015-11-04 | 天津大学 | Three-passband microstrip filter based on SIR structure |
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