CN1747227A - Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress - Google Patents
Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress Download PDFInfo
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- CN1747227A CN1747227A CN 200510029139 CN200510029139A CN1747227A CN 1747227 A CN1747227 A CN 1747227A CN 200510029139 CN200510029139 CN 200510029139 CN 200510029139 A CN200510029139 A CN 200510029139A CN 1747227 A CN1747227 A CN 1747227A
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Abstract
The little band open loop coupling band-pass filter that the invention discloses a kind of offset-type micro-strip resonantor and have harmonic restraining function.Described filter comprises incoming feeder and output feeder, open circuit loop coupling device, it is characterized in that, also comprises the offset-type micro-strip resonantor, and described incoming feeder links to each other with open circuit loop coupling device respectively with after the series connection of offset-type micro-strip resonantor with output feeder again.The present invention is by on the basis of traditional open loop coupling band-pass filter, series compensation type micro-band resonance unit between input and output feeder line and open circuit loop coupling device relies on the forbidden band characteristic of compensated compact microstrip resonant cell to reach the function that increases the outer inhibition of filter band.That the present invention has is simple in structure, overall dimensions is little, and insert that loss is little, band is outer suppresses advantage such as big, can be with the backing material making of any suitable microwave circuit.
Description
Technical field:
The invention belongs to the technical field of microwave microstrip circuit, particularly Design of Bandpass, specifically a kind of offset-type micro-strip resonantor and the little band open loop coupling band-pass filter that comprises the harmonic wave inhibition of this resonator.
Background technology:
Band pass filter is very important device in the microwave circuit,, the performance and the cost of filter is had higher requirement more and more under the serious situation in frequency spectrum resource growing tension and electromagnetic interference.Desirable filter characteristic should be undamped in passband, and big as far as possible decay is arranged in the forbidden band.
The microstrip coupled band pass filter of open circuit ring is to be proposed first in nineteen ninety-five by Jia-Sheng Hong, and has obtained using widely in the plane microwave circuit.The filter of the type has good frequency selectivity and low insertion loss, and area is less, just can realize on the common printed circuit board technology, need not through hole ground connection.But less at this filter at attenuation outside a channel, the decay of 10dB～15dB is particularly only arranged at second order, three order harmonics places, can not satisfy the needs of practical application far away, often need to add low pass filter and suppress harmonic wave.
Fig. 1 has shown the structure chart of the microstrip coupled band pass filter of open circuit ring, and as we can see from the figure, this coupling filter is by two open circuit resonant ring symmetrical coupled, and adopts asymmetrical 50 Ω input and output feeder lines.The microstrip coupled band pass filter of this open circuit ring, the work centre frequency is 1.8GHz, uses the F4B material, and relative dielectric constant is 2.65, and thickness is 1mm, and the length of open circuit coupling loop is 56mm, is 1/2nd guide wavelengths of operating frequency.Fig. 2 is the emulation of filter and the frequency response chart of test for this reason.Among the figure, S21 is the transmission characteristic of this filter, leads to in-band insertion loss less than 2.7dB (comprising two SMA connectors); S11 is the stationary wave characteristic of this filter, and all greater than 12.6dB, at the second harmonic place of operating frequency, minimum attenuation outside a channel is 12dB in free transmission range.This shows that the microstrip coupled band pass filter of this open circuit ring has good filtering characteristic in passband.But because the parasitic passband effect of microstrip circuit, it is less to decay at the second harmonic place, can not well satisfy needs and application in the side circuit.
Summary of the invention:
The objective of the invention is to overcome the prior art above shortcomings, propose a kind of little band open loop coupling band-pass filter with harmonic restraining function, make it under the situation that does not influence the passband internal characteristic, the band that has increased filter suppresses outward.
The technical scheme of technical solution problem of the present invention is as follows:
A kind of offset-type micro-strip resonantor is characterized in that, comprises micro-band resonance unit and open circuit compensated microstrip line, and the centre of described micro-band resonance unit is each open circuit compensated microstrip line in parallel up and down; Described micro-band resonance unit comprises input, output, one group of folding microstrip line and middle microstrip line, described folding microstrip line inward at both ends is folding and be that the line of symmetry symmetry is provided with middle microstrip line, described in the middle of the two ends of microstrip line link to each other with output with input respectively.
A kind of little band open loop coupling band-pass filter with harmonic restraining function, comprise incoming feeder and output feeder, open circuit loop coupling device, it is characterized in that, also comprise aforesaid offset-type micro-strip resonantor, described incoming feeder links to each other with open circuit loop coupling device respectively with after the series connection of offset-type micro-strip resonantor with output feeder again.
Described input and output feeder line live width is 50 Ω characteristic line breadths, adopts asymmetric feeder line, also can adopt symmetrical feeder line.
The input of described micro-band resonance unit, output link to each other with the incoming feeder of filter or output feeder, open circuit loop coupling device respectively.Incoming feeder one end that is filter links to each other with the input of first micro-band resonance unit, and the output of described micro-band resonance unit links to each other with the input of open circuit loop coupling device; The output of open circuit loop coupling device links to each other with the input of second micro-band resonance unit, and the output of described micro-band resonance unit is linking to each other with output feeder.
The total length of described coupling open circuit ring is 1/2nd of a filter center frequency wavelength, and width is 50 Ω live widths.
Coupling gap between the terminal coupling gap of described open circuit ring and two open circuits encircle is decided on concrete filter center frequency and substrate.
By above disclosed technical scheme as can be known, beneficial effect of the present invention is as follows:
Offset-type micro-strip resonantor of the present invention can reach the characteristic impedance of coupling low-frequency range and increase the purpose in forbidden band by at the middle part of micro-band resonance unit microstrip capacitive load in parallel.In addition, the open loop coupling band-pass filter that harmonic wave of the present invention suppresses, on the basis of traditional open loop coupling band-pass filter, at the input and output feeder line and the offset-type micro-strip resonantor of the present invention of connecting between the loop coupling device of opening a way, rely on the forbidden band characteristic of offset-type micro-strip resonantor to reach the function that increases the outer inhibition of filter band.Compare with original open loop coupling band-pass filter, do not increase circuit area, do not increase the insertion loss in the passband, the present invention can make of the backing material of any suitable microwave circuit.
Description of drawings:
Fig. 1 is traditional open loop coupling band-pass filter topology layout schematic diagram.
Fig. 2 is traditional open loop coupling band-pass filter frequency response chart of 1.8GHz for centre frequency.
Fig. 3 is the topology layout schematic diagram of offset-type micro-strip resonantor of the present invention.
Fig. 4 is the compensated compact microstrip resonant cell frequency response chart of 1.8GHz for cut-off frequency of the present invention.
Fig. 5 is the topology layout schematic diagram with little band open loop coupling band-pass filter of harmonic restraining function of the present invention.
Accompanying drawing 6 is the little band open loop coupling band-pass filter frequency response chart with harmonic restraining function of 1.8GHz for centre frequency of the present invention.
More than in each frequency response chart, S11 represents the stationary wave characteristic curve of this filter of drawing according to the analogue value, the stationary wave characteristic curve of this filter that S11 ' expression is drawn according to measured value; S21 represents the transfer curve according to this filter of analogue value drafting, and S21 ' expression is according to the transfer curve of this filter of measured value drafting.
Embodiment:
Little band open loop coupling band-pass filter embodiment with harmonic restraining function of the present invention design and being described in detail as follows, it is 2.65 that all embodiment all are produced on dielectric constant, thickness is on the F4B substrate of 1mm.The present invention also can make on other substrate, all belongs to protection scope of the present invention.
As shown in Figure 3, offset-type micro-strip resonantor of the present invention comprises micro-band resonance unit 10 and open circuit compensated microstrip line 11,12, and the centre of described micro-band resonance unit is each open circuit compensated microstrip line 11,12 in parallel up and down; Described micro-band resonance unit comprises input 13, output 14, one group of folding microstrip line 15,16 and middle microstrip line 17, described folding microstrip line 15,16 inward at both ends are folding and be that the line of symmetry symmetry is provided with middle microstrip line 17, and the two ends of described centre microstrip line 17 link to each other 14 with input 13 with output respectively.Wherein open a way compensated microstrip line 11,12 as the impedance of capacity load compensate for low frequency section and the forbidden band characteristic of increase micro-band resonance unit.Fig. 4 has shown the stimulation frequency response diagram of this offset-type micro-strip resonantor, can see that this offset-type micro-strip resonantor has the substantial low pass filtering characteristic, and cut-off frequency is 1.8GHz.Input/ output terminal 13 and 14 live width are 2.7mm, are 50 Ω characteristic line breadths, and the live width and the gap of micro-band resonance unit 10 are 0.3mm, and the length of open circuit compensated microstrip line 11,12 is 11.7mm, and width is 1mm.
As shown in Figure 5, little band open loop coupling band-pass filter that the present invention has harmonic restraining function comprises incoming feeder 31 and output feeder 32, and traditional open circuit loop coupling device 33 and 34 also comprises offset-type micro-strip resonantor 35 and 36 as shown in Figure 3.The present invention is on the basis of traditional open loop coupling band-pass filter, respectively at incoming feeder 31 and the output feeder 32 and an offset- type micro-strip resonantor 35 and 36 of respectively having connected between the loop coupling device 33,34 of opening a way.The two ends of described offset-type micro-strip resonantor promptly in the middle of the input of microstrip line and output respectively with open circuit loop coupling device 33 or 34, incoming feeder 31 or output feeder 32 link to each other.Fig. 6 has shown that the open circuit with harmonic restraining function of emulation and test encircles the frequency response chart of microstrip coupled filter.Can see insertion loss in passband all less than 2.8dB, not compare with insertion loss 2.7dB that traditional open circuit encircles microstrip coupled band pass filter and obviously increase that the main cause that causes this loss is the substrate dielectric loss.At the second harmonic place, the degree of decay reaches 58dB, encircles the degree of decay of the 12dB of the second harmonic place of microstrip coupled filter with traditional open circuit and compares, and the band that has increased 46dB is degree of inhibition outward.The live width of input/ output terminal 31 and 32 live width and open circuit coupling line 33 and 34 is 2.7mm, is 50 Ω characteristic line breadths.The inner separately coupling gap of open circuit ring 33 and 34 is 0.2mm, and the coupling gap between the open circuit ring 33 and 34 is 0.5mm.
Claims (5)
1. an offset-type micro-strip resonantor is characterized in that, comprises micro-band resonance unit and open circuit compensated microstrip line, and the centre of described micro-band resonance unit is each open circuit compensated microstrip line in parallel up and down; Described micro-band resonance unit comprises input, output, one group of folding microstrip line and middle microstrip line, described folding microstrip line inward at both ends is folding and be that the line of symmetry symmetry is provided with middle microstrip line, described in the middle of the two ends of microstrip line link to each other with output with input respectively.
2. little band open loop coupling band-pass filter with harmonic restraining function, comprise incoming feeder and output feeder, open circuit loop coupling device, it is characterized in that, also comprise offset-type micro-strip resonantor as claimed in claim 1, described incoming feeder links to each other with open circuit loop coupling device respectively with after the series connection of offset-type micro-strip resonantor with output feeder again.
3. little band open loop coupling band-pass filter that harmonic wave according to claim 2 suppresses is characterized in that, the input of described micro-band resonance unit, output link to each other with the incoming feeder of filter or output feeder, open circuit loop coupling device respectively.
4. little band open loop coupling band-pass filter that harmonic wave according to claim 2 suppresses is characterized in that described input and output feeder line live width is 50 Ω characteristic line breadths, adopts asymmetric feeder line, also can adopt symmetrical feeder line.
5. the little band open loop coupling band-pass filter that suppresses according to each described harmonic wave of claim 2 to 4 is characterized in that the total length of described open circuit loop coupling device is 1/2nd wavelength of operating frequency, and live width is 50 Ω characteristic line breadths.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510029139 CN1747227A (en) | 2005-08-26 | 2005-08-26 | Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress |
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| CN 200510029139 CN1747227A (en) | 2005-08-26 | 2005-08-26 | Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098018A (en) * | 2011-03-10 | 2011-06-15 | 江苏苏美达机电有限公司 | Tunable bandpass filter system |
| CN101694899B (en) * | 2009-10-16 | 2012-11-07 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
| CN102832434A (en) * | 2012-08-21 | 2012-12-19 | 华南理工大学 | Equal power splitter integrating band-pass filtering function |
| CN102881971A (en) * | 2012-06-12 | 2013-01-16 | 电子科技大学 | Novel ultra-wideband pass filter based on multimode resonance structure |
| CN110837722A (en) * | 2019-11-13 | 2020-02-25 | 中国船舶重工集团公司第七二四研究所 | Design method of high-power microwave transceiving front-end circuit |
-
2005
- 2005-08-26 CN CN 200510029139 patent/CN1747227A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694899B (en) * | 2009-10-16 | 2012-11-07 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
| CN102098018A (en) * | 2011-03-10 | 2011-06-15 | 江苏苏美达机电有限公司 | Tunable bandpass filter system |
| CN102881971A (en) * | 2012-06-12 | 2013-01-16 | 电子科技大学 | Novel ultra-wideband pass filter based on multimode resonance structure |
| CN102881971B (en) * | 2012-06-12 | 2015-01-21 | 电子科技大学 | Novel ultra-wideband pass filter based on multimode resonance structure |
| CN102832434A (en) * | 2012-08-21 | 2012-12-19 | 华南理工大学 | Equal power splitter integrating band-pass filtering function |
| CN110837722A (en) * | 2019-11-13 | 2020-02-25 | 中国船舶重工集团公司第七二四研究所 | Design method of high-power microwave transceiving front-end circuit |
| CN110837722B (en) * | 2019-11-13 | 2021-05-28 | 中国船舶重工集团公司第七二四研究所 | Design method of high-power microwave transceiving front-end circuit |
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