CN208797149U - A kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator - Google Patents
A kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator Download PDFInfo
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- CN208797149U CN208797149U CN201821678475.6U CN201821678475U CN208797149U CN 208797149 U CN208797149 U CN 208797149U CN 201821678475 U CN201821678475 U CN 201821678475U CN 208797149 U CN208797149 U CN 208797149U
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- mirror image
- open circuit
- resonator
- wide band
- input line
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Abstract
The utility model discloses a kind of ultra wide band bandpass filters based on mirror image open circuit step electric impedance resonator, are used for radio frequency, microwave system field.It includes the input line of a parallel two wires coupled structure composition with defect ground, an output line and a mirror image open circuit step electric impedance resonator being made of the parallel two wires coupled structure with defect ground.The input line and the output line are made of two Coupled Miccrostrip Lines structures with defect ground structure, the defect ground structure is made of two symmetrical rectangular slots, and the stepped impedance minor matters that the mirror image open circuit step electric impedance resonator is opened a way by a common half-wave resonator by load images form.This ultra wide band bandpass filter realizes the harmonics restraint effect of circuit using defect ground structure, makes the position of transmission zero be easy to adjust by minor matters load images open circuit step electric impedance resonator, to realize excellent passband selectivity, and without undesirable coupling.
Description
Technical field
The utility model belongs to radio frequency, microwave system field, humorous based on mirror image open circuit stepped impedance more particularly to one kind
The bandpass filter of vibration device, with ultra wide bandwidth and excellent passband selectivity.
Background technique
The research of Conventional wide band filter comparative maturity, but mostly still using the design theory of narrow band filter as base
Plinth, thus formula is more tedious, and narrower bandwidth, is poorly suitable for the design of modern broadband filter.Currently, modern broadband filters
The design of device can be summarized as two aspects, on the one hand be to improve to the traditional structure of broadband filter, to traditional design formula
Simplified, so that design is become simple and feasible, and the pass band width and bandwidth of rejection of extended filtering device to a certain extent；It is another
Aspect is that continuous new construction, the new model for proposing broadband filter obtains functional to fundamentally solve bandwidth problem
Satisfactory broadband and ultra wide band microwave filter.Such as Zhu L. et al. was proposed in 2005 and is hindered a three mode step ladders
Antiresonance device structure is designed for ultra-wide band filter.Due to this design method based on multimode resonator, structure letter is realized
List and pass-band performance is good, causes many scholars and has carried out a large amount of extension Journal of Sex Research, propose many modified resonators
Structure applies to ultra-wide band filter design.Although these ultra-wide band filters can satisfy Federal Communications Commission
(FCC) requirement for ultra-wide band filter in terms of pass-band performance, but it is slower in the rate of decay of lower sideband, and
Front end stopband rejection characteristic is also to be improved.
Summary of the invention
It is a kind of using with defect ground structure parallel coupling that in order to overcome the deficiencies of the prior art, the utility model provides
Structure opens a way step electric impedance resonator using minor matters load images to control positioned at lower come the problem of improving coupling gap
With the transmission zero at upper-passband edge, to realize excellent passband selectivity.
The technical scheme adopted by the utility model to solve the technical problem is as follows: based on mirror image open circuit step electric impedance resonator
Ultra wide band bandpass filter include one with defect ground parallel two wires coupled structure composition input line, one by band defect
The output line of the parallel two wires coupled structure composition on ground and a mirror image open circuit step electric impedance resonator.The input line and described
Output line is made of two Coupled Miccrostrip Lines structures with defect ground structure, and the defect ground structure is by two symmetrical squares
Shape slot composition, described two symmetrical rectangular slots are located at the lower section of the parallel coupling structure of the input line/output line
Substrate ground end.The mirror image open circuit step electric impedance resonator is opened a way by a common half-wave resonator by load images
Stepped impedance minor matters composition, the half-wave resonator, the minor matters plane of symmetry having the same in vertical direction.It is described
Input line is located at the left side of mirror image open circuit step electric impedance resonator, and the output line is located at mirror image open circuit stepped impedance
The right side of resonator, two ports are the microstrip lines that impedance is 50 ohm, and described two ports are located at the ultra wide band
The left and right side of bandpass filter, the left side port and the Coupled Miccrostrip Lines phase positioned at the input line bottom
Even, the right side port is connected with the Coupled Miccrostrip Lines positioned at the output line bottom, and signal is defeated from left side port
Enter, it is defeated from right side port successively after the input line, mirror image open circuit step electric impedance resonator and the output line
Out.
The gap between the input line and the Coupled Miccrostrip Lines of the output line can influence ultra wide band band
The relative bandwidth of bandpass filter, the defect ground structure can increase the Out-of-band rejection of filter, and the impedance for improving circuit is special
Property, the mirror image open circuit step electric impedance resonator determines to be located at the frequency where lower and upper-passband edge transmission zero.
The utility model has the beneficial effects that due to using defect ground structure, and then influence distributed inductance, the capacitor of circuit
It realizes the harmonics restraint effect of circuit, is loaded with mirror image step electric impedance resonator of opening a way by minor matters and makes the position of transmission zero
Easy adjusting is set, to realize excellent passband selectivity, and without undesirable coupling.
Detailed description of the invention
Fig. 1 is the positive structure schematic of the ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator, Fig. 2
For the reverse structure schematic of the ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator.
Fig. 3 be based on mirror image open a way step electric impedance resonator ultra wide band bandpass filter domain front, Fig. 4 be based on
The reverse side of the ultra wide band bandpass filter domain of mirror image open circuit step electric impedance resonator.
Fig. 5 is the parameter of the ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonatorS 11、S 21Analogous diagram.
In figure: 1 and 7 be port, and 2 be input line, and 3 and 8 for defect, and 4 be half-wave resonator, and 5 and 6 be stepped impedance
Minor matters, 9 be output line, 10 and 11 be coupled microstrip line, and 12 be gap.
Specific embodiment
With reference to the accompanying drawing, the utility model is further described.
In Fig. 1, port 1 is located at the left end of filter, and port 7 is located at the right end of filter；Input line 2 is parallel by two
Coupled microstrip line 10,11 forms；Gap 12 is between coupled microstrip line 10 and coupled microstrip line 11；9 be output line, input line
2 and output line 9 along the plane of symmetry bilateral symmetry；Defect 3 be located at input line 2 lower substrate ground terminal；Defect 8 be located at output
The lower substrate ground terminal of line 9；4 be half-wave resonator；5 and 6 be stepped impedance minor matters；Half-wave resonator 4, stepped impedance
Minor matters 5 and 6 are placed along plane of symmetry bilateral symmetry；Signal is inputted by port 1, enters loading stepped impedance branch by input line 2
The resonator 4 of section is exported using output line 9 from port 7.
In Fig. 2, defect 3 and defect 8 be two along the symmetrical rectangular channel of the plane of symmetry.It is to be noted that drawing
Entering defect ground structure makes the bandwidth of filter become 6.1GHz from 5.6GHz, it is seen that bandwidth of the defect ground structure to filter
It has a significant effect.
Fig. 3 is the front of the ultra wide band bandpass filter domain based on mirror image open circuit step electric impedance resonator, input port 1
It is all 50 ohm microstrips with output port 7；Input line 2 is made of two Coupled Miccrostrip Lines 10,11, coupled microstrip line 10
Length with coupled microstrip line 11 is all 4.1mm, and width is all 0.2mm, between coupled microstrip line 10 and coupled microstrip line 11
Gap 12 is 0.1mm；The length of half-wave resonator 4 is 8.9mm, width 0.2mm；The length of stepped impedance minor matters 5 is
6.7mm, width 0.4mm；The length of stepped impedance minor matters 6 is 1mm, width 0.9mm；Input line 2 and output line 9 are along symmetrical
Face bilateral symmetry；Signal is inputted by port 1, the resonator 4 of loading stepped impedance minor matters is entered by input line 2, using defeated
Outlet 9 is exported from port 7.The dielectric constant for making the printed board of bandpass filter is 10.2, plate thickness 0.635mm, copper
Foil is with a thickness of 0.035mm.
Fig. 4 be based on mirror image open a way step electric impedance resonator ultra wide band bandpass filter domain reverse side, defect 3
In the lower substrate ground terminal of input line 2；Defect 8 be located at output line 9 lower substrate ground terminal；Defect 3 and defect 8
It is two along the symmetrical rectangular channel of the plane of symmetry；Defect 3 and defect 8 length be all 4.1mm, width is all 1mm.
With reference to Fig. 5, the passband of bandpass filter is 3.7GHz to 9.8GHz, centre frequency 6.75GHz, is transmitted at two
Frequency 3.57GHz and 10.49GHz corresponding to zero point nearby have more than the excellent Out-of-band rejection of 35dB, the echo damage of filter
Consumption is lower than -10dB.
Claims (4)
1. a kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator, including by parallel two with defect ground
The input line of line coupled structure composition, the output line being made of the parallel two wires coupled structure with defect ground and a mirror image are opened a way
Ladder hinders terraced resonator, characterized in that the input line is located at the left side that mirror image open circuit ladder hinders terraced resonator, described defeated
Outlet is located at the right side that mirror image open circuit ladder hinders terraced resonator, and the input line and the output line are opened a way along the mirror image
The longitudinally asymmetric face bilateral symmetry that ladder hinders terraced resonator is placed, and two ports are located at the ultra wide band bandpass filter
Left and right side, input signal are inputted from left side port, successively hinder terraced resonance by the input line, mirror image open circuit ladder
After device and the output line, exported from right side port.
2. ultra wide band bandpass filter according to claim 1, characterized in that constitute the two of the input line/output line
The equal length of Coupled Miccrostrip Lines, gap and position between two Coupled Miccrostrip Lines of the input line
Gap between two Coupled Miccrostrip Lines of the input line is equidistant.
3. ultra wide band bandpass filter according to claim 1, characterized in that constitute the institute of the input line/output line
It states defect ground structure to be made of two symmetrical rectangular slots, described two symmetrical rectangular slots are located at the input line/output line
The parallel two wires coupled structure lower substrate ground terminal.
4. ultra wide band bandpass filter according to claim 1, characterized in that the mirror image open circuit ladder hinders terraced resonator
The stepped impedance minor matters opened a way by a common half-wave resonator by load images form, the half-wave resonator,
The minor matters plane of symmetry having the same in vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821678475.6U CN208797149U (en) | 2018-10-17 | 2018-10-17 | A kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821678475.6U CN208797149U (en) | 2018-10-17 | 2018-10-17 | A kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator |
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| Publication Number | Publication Date |
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| CN208797149U true CN208797149U (en) | 2019-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821678475.6U Expired - Fee Related CN208797149U (en) | 2018-10-17 | 2018-10-17 | A kind of ultra wide band bandpass filter based on mirror image open circuit step electric impedance resonator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525217A (en) * | 2020-03-27 | 2020-08-11 | 北京邮电大学 | 5G millimeter wave stepped impedance open-circuit branch film IPD band-pass filter chip |
-
2018
- 2018-10-17 CN CN201821678475.6U patent/CN208797149U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525217A (en) * | 2020-03-27 | 2020-08-11 | 北京邮电大学 | 5G millimeter wave stepped impedance open-circuit branch film IPD band-pass filter chip |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190426 Termination date: 20191017 |
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| CF01 | Termination of patent right due to non-payment of annual fee |