CN104051832A - Miniaturized broadband band-pass filter based on spiral resonator - Google Patents
Miniaturized broadband band-pass filter based on spiral resonator Download PDFInfo
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- CN104051832A CN104051832A CN201410287082.2A CN201410287082A CN104051832A CN 104051832 A CN104051832 A CN 104051832A CN 201410287082 A CN201410287082 A CN 201410287082A CN 104051832 A CN104051832 A CN 104051832A
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Abstract
The invention discloses a miniaturized broadband band-pass filter based on a spiral resonator, which is realized in a microstrip form and comprises a microstrip substrate, a bottom layer ground and a top layer microstrip circuit, wherein the microstrip substrate is formed on the bottom layer ground, and the top layer microstrip circuit is formed on the microstrip substrate; the top-layer microstrip circuit comprises an input tap, an output tap and a resonator column, wherein the resonator column is connected between the input tap and the output tap. The invention adopts nested coupling to greatly increase the coupling strength between resonators, and is easy to realize a broadband band-pass filter by matching with a tapped feed mode. The resonator provided by the invention has the advantages of simple and compact structure, convenience in processing and manufacturing, and suitability for microwave integrated circuits.
Description
Technical field
The present invention relates to microstrip filter technical field, particularly a kind of minimized wide-band band pass filter based on helical resonator.
Background technology
Filter is for suppressing the indispensable important passive device of interference signal in wireless communication system.Along with the fast development of radio communication, for the requirement of communication channel capacity, grow with each passing day, need to improve with the broadband filter of the Wideband Signal Processing the channel capacity of whole system.
In the microwave/radio-frequency apparatus of communication, frequency range represents with hertz (Hz) conventionally.From band wide angle, relative bandwidth be greater than 20% or absolute bandwidth be greater than 1GHz and belong to broadband filter.Wherein, relative bandwidth BW=(f
2-f
1)/f
0.F
2and f
1be respectively the upper lower limiting frequency of passband, f
0centered by frequency.
The broadband filter that micro-band is realized adopts interdigital or pectinate line structure to realize mostly, but this class filter all needs ground connection, is to face the inevitably interference of other circuit when the system integration.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of minimized wide-band band pass filter based on helical resonator, is difficult to avoid the problem of ground connection to solve traditional broadband filter, increases stiffness of coupling between resonator, reduces filter size.
(2) technical scheme
For achieving the above object, the invention provides a kind of minimized wide-band band pass filter based on helical resonator, this minimized wide-band band pass filter adopts micro-band forms to realize, comprise microstrip substrate, bottom and top layer microstrip circuit, wherein, microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate; Wherein, top layer microstrip circuit comprises input tap 5, output tap 6 resonator row, and these resonator row are connected between input tap 5 and output tap 6.
In such scheme, the transmission line that described input tap 5 or output tap 6 are 50 ohm of characteristic impedances.
In such scheme, between described input tap 5 or output tap 6 and this resonator row, adopt the transmission line of gradual change.
In such scheme, described resonator row comprise the resonator element of a plurality of parallel coupling structures, and each resonator element comprises the helical resonator of two mutually nested couplings.Described helical resonator adopts uniform impedance transmission line or stepped impedance transmission line, and its electrical length is 1/2 wavelength at centre frequency place.The resonator element of the described a plurality of parallel coupling structures certain position that spatially staggers up and down, makes first helical resonator in all resonator elements in same level position.
In such scheme, the relative dielectric constant 1-100 of described microstrip substrate, thickness is 0.05-5mm.
In such scheme, this minimized wide-band band pass filter adopts direct-connected feeding classification or coupling feed way.
(3) beneficial effect
From technique scheme, can find out, the present invention has following beneficial effect:
1, the minimized wide-band band pass filter based on helical resonator provided by the invention, owing to adopting helical structure, compares with 1/2 traditional wavelength hairpin-type resonator, and size reduces greatly.
2, the minimized wide-band band pass filter based on helical resonator provided by the invention, helical structure can be realized nested coupling, has greatly strengthened the stiffness of coupling between resonator, is easy to realize broadband character.
3, the minimized wide-band band pass filter based on helical resonator provided by the invention, due to every two nested couplings of resonator, when the every increase of filter order two rank only approximately increase a resonator area, has increased reduced size when improving stopband inhibition.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to the minimized wide-band band pass filter based on helical resonator of the embodiment of the present invention.
Fig. 2 is the schematic diagram of resonator element in the minimized wide-band band pass filter shown in Fig. 1.
Fig. 3 is the schematic diagram of helical resonator in the resonator element shown in Fig. 2.
Fig. 4 is the schematic diagram of two resonator element parallel couplings in the minimized wide-band band pass filter shown in Fig. 1.
Fig. 5 carries out the result figure of emulation testing to the minimized wide-band band pass filter shown in Fig. 1.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, the invention provides a kind of minimized wide-band band pass filter based on helical resonator, adopt micro-band forms to realize, comprise microstrip substrate, bottom and top layer microstrip circuit, wherein, microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate; Wherein, top layer microstrip circuit comprises input tap 5, output tap 6 resonator row, and these resonator row are connected between input tap 5 and output tap 6.The relative dielectric constant 1-100 of microstrip substrate, thickness is 0.05-5mm.This minimized wide-band band pass filter adopts direct-connected feeding classification or coupling feed way.
Wherein, these resonator row comprise the resonator element of a plurality of parallel coupling structures, and each resonator element comprises the helical resonator of two mutually nested couplings, as shown in Figure 2.Described helical resonator adopts uniform impedance transmission line or stepped impedance transmission line, and its electrical length is 1/2 wavelength at centre frequency place.The resonator element of the described a plurality of parallel coupling structures certain position that spatially staggers up and down, makes first helical resonator in all resonator elements in same level position.
For this resonator row, helical resonator from left to right, (2N+1) individual resonator and (2N+2) individual resonator (N=0 that is nested, 1,2...), the every increase of filter order two rank approximately increase the area of 1 resonator, have greatly reduced the size of filter.(2N+1) (N=0,1,2...) individual resonator and (2N+2) individual resonator are nested, and realize on the one hand stronger coupling, have reduced significantly on the other hand filter area.Adopt nested coupling greatly to increase the stiffness of coupling between resonator, coordinate tapped feeding classification, be easy to realize broadband band-pass filter.The number of helical resonator is determined according to selected filter order.The folding number of turns of helical resonator is determined by craft precision, frequency range etc.
The transmission line that input tap 5 or output tap 6 are 50 ohm of characteristic impedances.Between input tap 5 or output tap 6 and this resonator row, adopt the transmission line of gradual change.The position of input tap and output tap is determined by selected bandwidth, exponent number and return loss.
In the present embodiment, substrate relative dielectric constant 3.55, thickness 0.508mm.
As shown in Figure 1, Fig. 1 is the schematic diagram according to the minimized wide-band band pass filter based on helical resonator of the embodiment of the present invention, and the present embodiment is the 6 rank band pass filters that utilize helical resonator to realize, centre frequency 6.6GHz, relative bandwidth 25%, initial designs clawback loss-20dB.According to computation of table lookup, obtain coupling coefficient K12=K56=0.215, K23=K45=0.154, K34=0.146.Wherein, digitized representation resonator order from left to right.As K12 represents the coupling coefficient of first resonator and second resonator, other by that analogy.Have the quality factor q ex=3.85 of carrying, it determines tap position T.
In Fig. 1,6 rank band pass filters form by inputting tap 5, output tap 6, the first resonator 7, the second resonator 8, the 3rd resonator 9, the 4th resonator 10, the 5th resonator 11 and sixth resonator 12.The coupling space 0.375mm of the first resonator 7 and the second resonator 8, the coupling space 0.15mm of the second resonator 8 and the 3rd resonator 9, the coupling space 0.225mm of the 3rd resonator 9 and the 4th resonator 10, the coupling space 0.15mm of the 4th resonator 10 and the 5th resonator 11, the coupling space 0.375mm of the 5th resonator 11 and sixth resonator 12.
Fig. 2 is the schematic diagram of resonator element in the minimized wide-band band pass filter shown in Fig. 1.As shown in Figure 2, in resonator element, two helical resonators adopt nested type coupled structure.Resonator 1 resonator 2, about center odd symmetry, changes interval S 1 and can regulate coupling coefficient.The coupling space of nested type coupled structure refers to S1 in the following description.
Fig. 3 is the schematic diagram of helical resonator in the resonator element shown in Fig. 2.Helical resonator electrical length is 1/2 wavelength at centre frequency place, and transmission line width is that W is 0.3mm.In actual applications, frequency place 1/2 wavelength centered by the initial designs length of helical resonator.Due to the impact of adjacent resonators, on final realization, resonator length is slightly longer than initial designs length.For the folding criterion of helical resonator, H1, H2, W1 and W2 are greater than the minimum process precision of W twice, and this example is got and is not less than 0.8mm.In the present embodiment, helical resonator is at 6.6GHz place resonance.
Fig. 4 is the schematic diagram of two resonator element parallel couplings in the minimized wide-band band pass filter shown in Fig. 1.Resonator 3 resonator 4, about center odd symmetry, change interval S 2 and can regulate coupling coefficient.The coupling space of parallel coupling structure refers to S2 in the following description.
As shown in Figure 5, Fig. 5 carries out the result figure of emulation testing to the minimized wide-band band pass filter shown in Fig. 1.The emulation of embodiment of the present invention and test result frequency characteristic comprise: S11 and S21, and abscissa represents frequency variable, unit is GHz; Ordinate represents amplitude variable, and unit is dB.Dotted line represents simulation result, realizes and represents test result.As seen from Figure 5, band pass filter centre frequency 6.6GHz of the present invention, absolute bandwidth is greater than 1.5GHz.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the minimized wide-band band pass filter based on helical resonator, it is characterized in that, this minimized wide-band band pass filter adopts micro-band forms to realize, comprise microstrip substrate, bottom and top layer microstrip circuit, wherein, microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate; Wherein, top layer microstrip circuit comprises input tap (5), output tap (6) resonator row, and these resonator row are connected between input tap (5) and output tap (6).
2. the minimized wide-band band pass filter based on helical resonator according to claim 1, is characterized in that, the transmission line that described input tap (5) or output tap (6) are 50 ohm of characteristic impedances.
3. the minimized wide-band band pass filter based on helical resonator according to claim 1, is characterized in that, adopts the transmission line of gradual change between described input tap (5) or output tap (6) and this resonator row.
4. the minimized wide-band band pass filter based on helical resonator according to claim 1, it is characterized in that, described resonator row comprise the resonator element of a plurality of parallel coupling structures, and each resonator element comprises the helical resonator of two mutually nested couplings.
5. the minimized wide-band band pass filter based on helical resonator according to claim 4, is characterized in that, described helical resonator adopts uniform impedance transmission line or stepped impedance transmission line, and its electrical length is 1/2 wavelength at centre frequency place.
6. the minimized wide-band band pass filter based on helical resonator according to claim 4, it is characterized in that, the resonator element of the described a plurality of parallel coupling structures certain position that spatially staggers up and down, makes first helical resonator in all resonator elements in same level position.
7. minimized wide-band band pass filter according to claim 1, is characterized in that, the relative dielectric constant 1-100 of described microstrip substrate, and thickness is 0.05-5mm.
8. the minimized wide-band band pass filter based on helical resonator according to claim 1, is characterized in that, this minimized wide-band band pass filter adopts direct-connected feeding classification or coupling feed way.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410287082.2A CN104051832A (en) | 2014-06-24 | 2014-06-24 | Miniaturized broadband band-pass filter based on spiral resonator |
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| CN201410287082.2A CN104051832A (en) | 2014-06-24 | 2014-06-24 | Miniaturized broadband band-pass filter based on spiral resonator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409816A (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | Plane band-pass filter capable of realizing ultra-wide stop-band suppression |
| CN104966871A (en) * | 2015-07-13 | 2015-10-07 | 南京恒电电子有限公司 | Microstrip planar spiral filter and design method thereof |
| CN107317073A (en) * | 2017-06-23 | 2017-11-03 | 电子科技大学 | A kind of wave filter based on additional electric coupling circuit/combiner power capacity lift technique |
| CN112563699A (en) * | 2021-02-25 | 2021-03-26 | 成都频岢微电子有限公司 | Miniaturized spiral surface-mountable band-pass filter based on multilayer PCB structure |
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|---|---|---|---|---|
| CN1301411A (en) * | 1998-05-15 | 2001-06-27 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
| CN1433582A (en) * | 1999-12-01 | 2003-07-30 | 纳幕尔杜邦公司 | Tunable high temperature superconducting filter |
| CN1622389A (en) * | 2003-11-24 | 2005-06-01 | 海泰超导通讯科技（天津）有限公司 | Resonator with symmetric double helix structure and filter thereof |
| CN1938899A (en) * | 2003-11-21 | 2007-03-28 | 纳幕尔杜邦公司 | Laser trimming to tune the resonance frequency of a spiral resonator, the characteristics of a high temperature superconductor filter comprised of spiral resonators, or the resonance frequency of a pl |
| CN103762403A (en) * | 2013-12-31 | 2014-04-30 | 电子科技大学 | Three-passing-band filter |
-
2014
- 2014-06-24 CN CN201410287082.2A patent/CN104051832A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301411A (en) * | 1998-05-15 | 2001-06-27 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
| CN1433582A (en) * | 1999-12-01 | 2003-07-30 | 纳幕尔杜邦公司 | Tunable high temperature superconducting filter |
| CN1938899A (en) * | 2003-11-21 | 2007-03-28 | 纳幕尔杜邦公司 | Laser trimming to tune the resonance frequency of a spiral resonator, the characteristics of a high temperature superconductor filter comprised of spiral resonators, or the resonance frequency of a pl |
| CN1622389A (en) * | 2003-11-24 | 2005-06-01 | 海泰超导通讯科技（天津）有限公司 | Resonator with symmetric double helix structure and filter thereof |
| CN103762403A (en) * | 2013-12-31 | 2014-04-30 | 电子科技大学 | Three-passing-band filter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409816A (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | Plane band-pass filter capable of realizing ultra-wide stop-band suppression |
| CN104966871A (en) * | 2015-07-13 | 2015-10-07 | 南京恒电电子有限公司 | Microstrip planar spiral filter and design method thereof |
| CN107317073A (en) * | 2017-06-23 | 2017-11-03 | 电子科技大学 | A kind of wave filter based on additional electric coupling circuit/combiner power capacity lift technique |
| CN112563699A (en) * | 2021-02-25 | 2021-03-26 | 成都频岢微电子有限公司 | Miniaturized spiral surface-mountable band-pass filter based on multilayer PCB structure |
| CN112563699B (en) * | 2021-02-25 | 2021-05-11 | 成都频岢微电子有限公司 | Miniaturized spiral surface-mountable band-pass filter based on multilayer PCB structure |
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Application publication date: 20140917 |