CN105720341A - Energy-load coupling T-shaped ring band-pass filter for S wave band - Google Patents
Energy-load coupling T-shaped ring band-pass filter for S wave band Download PDFInfo
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- CN105720341A CN105720341A CN201610131785.5A CN201610131785A CN105720341A CN 105720341 A CN105720341 A CN 105720341A CN 201610131785 A CN201610131785 A CN 201610131785A CN 105720341 A CN105720341 A CN 105720341A
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- 230000008878 coupling Effects 0.000 title claims abstract description 42
- 238000010168 coupling process Methods 0.000 title claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 42
- 239000000758 substrate Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229950000845 politef Drugs 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 5
- 230000005670 electromagnetic radiation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention discloses an energy-load coupling T-shaped ring band-pass filter for an S wave band. The energy-load coupling T-shaped ring band-pass filter comprises an input-side impedance matching line, stepped impedance lines, annular coupling lines, an output-side impedance matching line, a T-shaped microstrip line and energy-load coupling microstrip lines, wherein the T-shaped structure of the filter is an annular T-shaped resonator structure; and the over-large size in a single direction is avoided, so that the filter can be miniaturized. Meanwhile, the T-shaped structure is added to an annular coupling corner, so that the stopband rejection capability of the filter is strengthened. The energy-load coupling structure is added on the basis of the annular T-shaped resonator structure; the signal transmission path of the filter is increased by a strong input-output coupling design; and the transmission zero point is increased, so that the stopband rejection capability of the filter is improved.
Description
Technical field
The present invention relates to a kind of wave filter, refer more particularly to the energy-load coupled T-type annulus bandpass filter of a kind of S-band.
Background technology
Electromagnetic radiation energy transmission, with to collect be to transmit energy by the way of electromagnetic radiation, accepts the electromagnetic radiation energy of system transfers, or the electromagnetic radiation energy in environment, and this energy be converted into general instrument and equipment can the process of DC energy.This process has broken away from traditional wire transmission, is realized by free space transmission.
The radiofrequency signal of wireless communication system transmitting-receiving is analogue signal, this radio frequency analog signal needs to be filtered device filtering, the purpose of filtering is to ensure that and only allows the signal in frequency band pass through, noise outside rejection band, so wave filter plays crucial effect launching of signal during receiving, being requisite device, systematic function is had a significant impact by the quality of its performance.
The band filter manufacturing technology being applied to S-band has microstrip line, co-planar waveguide, coplanar stripline, solid-state resonator cavity etc., and traditional filter size is relatively big, is unfavorable for integrated, and performance is general, and design adjustment difficulty is relatively big, uses limited in a lot of occasions.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of size little, compact conformation, performance is good, the energy of the S-band that reliability is high-load coupled T-type annulus bandpass filter.
For reaching above-mentioned purpose, the present invention uses following technical proposals.
The energy of a kind of S-band-load coupled T-type annulus bandpass filter, adjusts line, T-shaped microstrip line and two sections of source-load coupled microstrip lines including sending-end impedance matched line, two sections of Stepped Impedance lines, two sections of ring-type coupling lines, outfan impedance matchings；
One end of sending-end impedance matched line is input, and the other end is connected by one end of one section of Stepped Impedance line and one section of ring-type coupling line, and the other end of this ring-type coupling line is unsettled；Interval is had between the free end of the free end of this section of ring-type coupling line and another section of ring-type coupling line, one end that the other end of another section of ring-type coupling line adjusts line by another section of Stepped Impedance line with outfan impedance matching is connected, it is outfan that outfan impedance matching adjusts the line other end, T-shaped microstrip line and two sections of ring-type coupling line couplings；
Source-load coupled microstrip line is ringed line, and one section of source-load coupled microstrip line is arranged at distance input end 2mm-15mm, and adjusts the angle of line more than 6 degree with outfan impedance matching,；Another section of source-load coupled microstrip line is arranged on distance outfan 2mm-15mm and locates, and is more than 6 degree with the angle of sending-end impedance matched line.
T-type structure can be used to suppression and carries the higher hamonic wave of logical/band elimination filter, it is possible to so that wave filter miniaturization.The coupled structure of source load simultaneously is a kind of strong I/O design, by increasing capacitance it is possible to increase the transmission path of filter signal, increases transmission zero, thus improves the stopband inhibition of wave filter.
Source-load coupled microstrip line is arranged at distance input end 2mm-15mm, and its distance more short central frequency is the lowest, does not the most change filter characteristic less than 2mm or more than 15mm.Source-load coupled microstrip line and outfan impedance matching adjust the angle of line or then can cause distortion owing to getting too close to the angle of sending-end impedance matched line if less than 6 degree, reduce performances reductions more than 6 degree bandwidth, so selection 6 °.
Preferably, described band filter makes on politef double-sided copper-clad board substrate.
Preferably, described substrate thickness is 0.813mm, and dielectric constant is 2.55, and loss tangent is equal to 0.001, and conduction band copper thickness is 0.035mm.
Preferably, source-load coupled microstrip line be width be the ringed line of 1mm, during actual selection, the least performance of width is the best, and in order to make mid frequency be 2.45ghz, one section of source-load coupled microstrip line is arranged at distance input end 7mm；Another section of source-load coupled microstrip line is arranged at distance outfan 7mm.
Preferably, described T-shaped microstrip line is ring-type T-shaped resonance structure.
Preferably, the input and output of total are symmetrical, if asymmetric behavior can decline.
Based on technique scheme, the T-type structure of wave filter is ring-type T-shaped resonance structure, it is to avoid has long size in a single direction, so can make wave filter more miniaturization.Meanwhile, T-type structure, the stopband inhibition of boostfiltering device are added at ring-type coupling turning；On the basis of ring-type T-shaped resonator structure, add source-load coupled structure, utilize strong input-output Coupling Design, increase filter signal transmission path, increase transmission zero, thus improve the stopband inhibition of wave filter.
Compared with prior art, the present invention mainly has a following remarkable advantage:
1. filter size is less, compact conformation, it is easy to integrated；
2. wave filter is operated in C-band, and mid frequency is 2.4Ghz, for ISM band, applied widely；
3. performance is good, broader bandwidth, and insertion loss is low；
4. reliability is high, and regulation performance is convenient, performance can be made more to meet the demand of user by changing parameter.
Accompanying drawing explanation
Fig. 1 is the structure chart of wave filter.
Fig. 2 is the S parameter simulation curve figure of wave filter.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings, but embodiments of the present invention are not limited to this.
Such as Fig. 1, the energy of a kind of S-band-load coupled T-type annulus bandpass filter, adjusts line 4, T-shaped microstrip line 5 and two sections of source-load coupled microstrip lines 6 including sending-end impedance matched line 2, two sections of ring-type coupling lines 3 of 1, two sections of Stepped Impedance lines, outfan impedance matching；
One end of sending-end impedance matched line 1 is input, and the other end is connected with one end of one section of ring-type coupling line 3 by one section of Stepped Impedance line 2, and the other end of this ring-type coupling line 3 is unsettled；Interval is had between the free end of the free end of this section of ring-type coupling line 3 and another section of ring-type coupling line 3, one end that the other end of another section of ring-type coupling line 3 adjusts line 4 by another section of Stepped Impedance line 2 with outfan impedance matching is connected, it is outfan that outfan impedance matching adjusts line 4 other end, and T-shaped microstrip line 5 couples with two sections of ring-type coupling lines 3；
In the present embodiment, source-load coupled microstrip line 6 be width be the ringed line of 1mm, one section of source-load coupled microstrip line 6 is arranged at distance input end 7mm, and adjusts the angle of line 4 more than 6 degree with outfan impedance matching；Another section of source-load coupled microstrip line 6 is arranged on distance outfan 7mm and locates, and is more than 6 degree with the angle of sending-end impedance matched line 1, and described T-shaped microstrip line 5 is ring-type T-shaped resonance structure.
In the present embodiment, band filter overall dimension is 27mm*27mm, uses microstrip line to realize, being to make on politef double-sided copper-clad board substrate, substrate thickness is 0.813mm, and dielectric constant is 2.55, loss tangent is equal to 0.001, and conduction band copper thickness is 0.035mm.
The operation principle of band filter disclosed in technique scheme is: signal is inputted by sending-end impedance matched line 1, adjusted line 4 by outfan impedance matching again to export, outfan impedance matching in the present embodiment adjusts a length of 7mm of line 4, in concrete preparation process, outfan impedance matching adjusts the length of line 4 will can change the matching performance of wave filter.
Entering the signal of this band filter, part signal is carried out coupled transfer by two sections of ring-type coupling lines 3.Annular coupling line 3 is two sections of width 1mm, the circular arc that angle is 84 °, and its major function is to increase the transmission path of signal, thus increases transmission zero, is substantially improved bandwidth and the operating point performance of wave filter.In concrete preparation process, coupling space regulation bandwidth and the center frequency point of annular coupling line 3 by changing arc angle regulation bandwidth and center frequency point, can be changed, but the width of circular arc will not change filter characteristic.Signal arrives Coupling point 7 by coupling.
Another part signal is transmitted via Stepped Impedance line 2, in the present embodiment, Stepped Impedance line 2 is length 6.5mm, one section of circular arc of 5.37 ° of central angle, change in the instantaneous impedance effect can be reduced, improving matching performance and wave filter operating point, in concrete preparation process, the length changing Stepped Impedance line 2 can make center frequency point generation large change.
The signal transmitted in Stepped Impedance line 2 enters microstrip line.In the present embodiment, microstrip line is two sections of ring-type coupling lines 3, and its width is 2.5mm, and the angle between two sections of ring-type coupling lines 3 is 30 ° (in concrete preparation, the biggest mid frequency of angle is the highest, in order to make mid frequency be 2.45Ghz, chooses angle 30 °).The adjustment of angle can change mid frequency and the signal incident power of wave filter.
The signal of ring-type coupling line 3 is by being coupled into the ringed line part 51 of T-shaped microstrip line 5, and T-shaped microstrip line 5 is to be made up of ringed line part 51 and vertical straight line portion 52.In the present embodiment, ringed line part 51 length 4mm, width 2.5mm, 27.7 ° of central angle, 2 is width 2.8mm, the circular arc that angle is 79.26 °.Change ringed line part 51 and grow and wide, the width of vertical straight line portion 52, mid frequency and bandwidth can be made to change.So the regulation of this structure is got up conveniently, it is possible to the parameter of regulation is many, is readily obtained the filtering performance wanted.Signal is joined through the signal of T-shaped microstrip line 5 with Coupling point 7, and the outfan adjusting line 4 from outfan impedance matching exports filtered signal.
The input of sending-end impedance matched line 1 is accessed wireless energy and receives the input signal mouth of system, just can obtain, from outfan, the output signal that frequency is 2.4Ghz.
From the S curve of Fig. 2 wave filter, filter centre frequency is 2.45Ghz, and three dB bandwidth, from 1.73GHz to 2.80GHz, carries a width of 1Ghz, and pass band insertion loss is-0.25dB, and wave filter service behaviour is good.
The embodiment of invention described above, is not intended that limiting the scope of the present invention.Any amendment, equivalent and improvement etc. done within the spiritual principles of the present invention, within should be included in the claims of the present invention.
Claims (5)
1. the energy of a S-band-load coupled T-type annulus bandpass filter, it is characterized in that, adjust line (4), T-shaped microstrip line (5) and two sections of source-load coupled microstrip lines (6) including sending-end impedance matched line (1), two sections of Stepped Impedance lines (2), two sections of ring-type coupling lines (3), outfan impedance matchings；
One end of sending-end impedance matched line (1) is input, and the other end is connected with one end of one section of ring-type coupling line (3) by one section of Stepped Impedance line (2), and the other end of this ring-type coupling line (3) is unsettled；Interval is had between free end and the free end of another section of ring-type coupling line (3) of this section of ring-type coupling line (3), one end that the other end of another section of ring-type coupling line (3) adjusts line (4) by another section of Stepped Impedance line (2) with outfan impedance matching is connected, it is outfan that outfan impedance matching adjusts line (4) other end, and T-shaped microstrip line (5) couples with two sections of ring-type coupling lines (3)；
Source-load coupled microstrip line (6) is ringed line, and one section of source-load coupled microstrip line (6) is arranged at distance input end 2mm-15mm, and adjusts the angle of line (4) more than 6 degree with outfan impedance matching；Another section of source-load coupled microstrip line (6) is arranged on distance outfan 2mm-15mm and locates, and is more than 6 degree with the angle of sending-end impedance matched line (1).
Band filter the most according to claim 1, it is characterised in that described band filter makes on politef double-sided copper-clad board substrate.
Band filter the most according to claim 2, it is characterised in that described substrate thickness is 0.813mm, dielectric constant is 2.55, and loss tangent is equal to 0.001, and conduction band copper thickness is 0.035mm.
Band filter the most according to claim 1, it is characterised in that source-load coupled microstrip line (6) be width be the ringed line of 1mm, one section of source-load coupled microstrip line (6) is arranged at distance input end 7mm；Another section of source-load coupled microstrip line (6) is arranged at distance outfan 7mm.
Band filter the most according to claim 1, it is characterised in that described T-shaped microstrip line (5) is ring-type T-shaped resonance structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610131785.5A CN105720341A (en) | 2016-03-09 | 2016-03-09 | Energy-load coupling T-shaped ring band-pass filter for S wave band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610131785.5A CN105720341A (en) | 2016-03-09 | 2016-03-09 | Energy-load coupling T-shaped ring band-pass filter for S wave band |
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| CN105720341A true CN105720341A (en) | 2016-06-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001267803A (en) * | 2000-03-17 | 2001-09-28 | Sharp Corp | Band filter device, and transmitter and transmitter- receiver using the band filter device |
| CN1874052A (en) * | 2006-06-08 | 2006-12-06 | 上海交通大学 | Miniaturized band-pass filter with wide stop band for loading epsilon shaped offset of microstrip |
| CN102005630A (en) * | 2010-12-10 | 2011-04-06 | 南京理工大学 | Small ultra wideband microstrip band-pass filter |
| CN102509821A (en) * | 2011-10-09 | 2012-06-20 | 西安电子科技大学 | Dual-mode bi-pass filter based on capacitance loading square resonant rings |
| CN104282969A (en) * | 2014-10-31 | 2015-01-14 | 中国计量学院 | Band-stop microstrip line filter |
-
2016
- 2016-03-09 CN CN201610131785.5A patent/CN105720341A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001267803A (en) * | 2000-03-17 | 2001-09-28 | Sharp Corp | Band filter device, and transmitter and transmitter- receiver using the band filter device |
| CN1874052A (en) * | 2006-06-08 | 2006-12-06 | 上海交通大学 | Miniaturized band-pass filter with wide stop band for loading epsilon shaped offset of microstrip |
| CN102005630A (en) * | 2010-12-10 | 2011-04-06 | 南京理工大学 | Small ultra wideband microstrip band-pass filter |
| CN102509821A (en) * | 2011-10-09 | 2012-06-20 | 西安电子科技大学 | Dual-mode bi-pass filter based on capacitance loading square resonant rings |
| CN104282969A (en) * | 2014-10-31 | 2015-01-14 | 中国计量学院 | Band-stop microstrip line filter |
Non-Patent Citations (1)
| Title |
|---|
| 张全琪: "基于1/4环状T型结构的源—负载耦合带通滤波器", 《空间电子技术》 * |
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