CN203242724U - Band pass filter with dumbbell band gap structures - Google Patents
Band pass filter with dumbbell band gap structures Download PDFInfo
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- CN203242724U CN203242724U CN 201220749598 CN201220749598U CN203242724U CN 203242724 U CN203242724 U CN 203242724U CN 201220749598 CN201220749598 CN 201220749598 CN 201220749598 U CN201220749598 U CN 201220749598U CN 203242724 U CN203242724 U CN 203242724U
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- dumbbell
- line
- band gap
- bandgap structure
- band
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Abstract
The utility model discloses a band pass filter with dumbbell band gap structures, which is used in fields of wireless communication systems, etc. The band pass filter with dumbbell band gap structures comprises an input feed line, an output feed line, two parallel coupled lines and two broken-line-shaped dumbbell band gap structure resonators. Each broken-line-shaped dumbbell band gap structure resonator is composed of a closed-loop rectangular microstrip line and a broken-line-shaped dumbbell band gap structure. The dumbbell parts on the two sides of each broken-line-shaped dumbbell band gap structure are square band gaps with the same length and the same width. The middle dumbbell arm is a broken-line-shaped band gap. The input feed line and the output feed line respectively having a 50-ohm feature line width are connected with an SMA feed device. The filter has the characteristics of small dimension, simple technology, high stop band suppression degree, and narrow and flat passing band, etc.
Description
Technical field
The utility model relates to a kind of band pass filter with dumbbell bandgap structure, can successfully suppress the high order parasitic passband, has preferably arrowband bandpass characteristics and frequency selectivity, can be used for the fields such as wireless communication system.
Background technology
The filter of microstrip structure is widely applied in wireless communication system because of advantages such as it are easy to design, easy integrated.Band pass filter is a kind of critical component in the radio communication, along with the development of space flight, radar and the communication technology, band pass filter has been proposed the requirements such as miniaturization, low insertion loss, high selectivity, the high inhibition degree of stopband.In order to adapt to the growth requirement of communication terminal device miniaturization and portability, at present research concentrates on the band pass filter of project organization compactness to satisfy actual needs.
Band pass filter (the D Jung of traditional dumbbell bandgap structure that the people such as D Jung propose in the paper " Miniaturised bandpass filter using dumb-bell-shaped slot resonator " that in January, 2012, " Electronics Letters " periodical was delivered, J Hansen and K Chang.Miniaturised bandpass filter using dumb-bell-shaped slot resonator[J] .Electronics Letters, 2012.1,48 (2): 100-102.), its size is larger, to the inhibition degree of stopband a little less than.
The utility model content
For the deficiencies in the prior art, the utility model provides a kind of band pass filter with dumbbell bandgap structure, and this kind band pass filter technique is simple, and have that insertion loss is low, passband is narrow, the performance index preferably such as the high inhibition degree of stopband, size are little.
The concrete technical scheme of the utility model is as follows:
A kind of band pass filter with dumbbell bandgap structure that the utility model proposes comprises incoming feeder, output feeder, two parallel coupled lines and two fold-line-shaped dumbbell bandgap structure resonators.Fold-line-shaped dumbbell bandgap structure resonator is comprised of closed loop rectangular microstrip line and dumbbell bandgap structure, and the dumbbell on dumbbell band gap both sides partly is as broad as long square band gap, and middle dumbbell arm is the fold-line-shaped band gap.
Described input and output feeder line is respectively 50 ohm characteristic live widths, connects feeder equipment.
The fold-line-shaped band gap is positioned at dumbbell band gap centre position, is symmetrical up and down with the Parallel Symmetric line; The gap of fold-line-shaped band gap is rectangular configuration, and between each gap between the upper and lower every equate, left and right sides equal in length; Microstrip line between the fold-line-shaped band gap up and down width equate, left and right sides equal in length.
The utility model compared with prior art has following outstanding substantive distinguishing features and remarkable advantage:
1. the linear arm of traditional dumbbell is improved to the fold-line-shaped structure, has increased the open circuit minor matters, thereby increase equivalent parallel electric capacity, rely on the characteristic of its slow wave effectively to reduce the size of filter.
2. the existence of microstrip capacitive load has reduced the insertion loss of passband, and two transmission zeros are arranged near passband, and stopband attenuation is larger, thereby has the characteristic that suppresses high order harmonic component.
3. feeder equipment adopts the commercial connector of SMA, and is simple in structure, saves cost.
Description of drawings
Fig. 1 is the band pass filter schematic layout pattern of traditional dumbbell bandgap structure.
Frequency is the band pass filter frequency response chart of traditional dumbbell bandgap structure of 7.38GHz centered by Fig. 2.
Fig. 3 is the band pass filter schematic layout pattern with dumbbell bandgap structure described in the utility model.
Fig. 4 is that centre frequency described in the utility model is the band pass filter frequency response chart with dumbbell bandgap structure of 6.16GHz.
Among the figure: 11-conventional filter incoming feeder, the left parallel coupled line of 12-conventional filter, the left closed loop rectangular microstrip of 13-conventional filter line, the left dumbbell bandgap structure of 14-, the right closed loop rectangular microstrip of 15-conventional filter line, the right dumbbell bandgap structure of 16-, the right parallel coupled line of 17-conventional filter, 18-conventional filter output feeder; 31-Novel Filter incoming feeder, the left parallel coupled line of 32-Novel Filter, the left closed loop rectangular microstrip of 33-Novel Filter line, the linear dumbbell bandgap structure of 34-left folding, the right closed loop rectangular microstrip of 35-Novel Filter line, the linear dumbbell bandgap structure of 36-right folding, the right parallel coupled line of 37-Novel Filter, 38-Novel Filter output feeder.
Embodiment
Below in conjunction with accompanying drawing, by embodiment the utility model is further described.
Referring to Fig. 3, a preferred embodiment is to work in the band pass filter with dumbbell bandgap structure that centre frequency is 6.16GHz.As shown in Figure 3, the band pass filter that has a dumbbell bandgap structure comprises incoming feeder 31, output feeder 38, left parallel coupled line 32, right parallel coupled line 37, left closed loop rectangular microstrip line 33, right closed loop rectangular microstrip line 35, the linear dumbbell bandgap structure 34 of left folding and the linear dumbbell bandgap structure 36 of right folding.
The utility model is on the band pass filter basis of traditional dumbbell bandgap structure shown in Figure 1, respectively the linear dumbbell arm of dumbbell bandgap structure 14 and 16 is changed into fold-line-shaped dumbbell arm, fold-line-shaped dumbbell arm is positioned at the centre position of dumbbell, between the upper and lower every equal, left and right sides equal in length, the dumbbell on both sides is as broad as long square structure between the band gap.Because fold-line-shaped dumbbell arm has increased the open circuit minor matters, thereby has increased equivalent parallel electric capacity, its slow wave characteristic has reduced the size of filter effectively.
The utility model dielectric material adopts Rogers5880, and its dielectric constant is ε
r=2.2, thickness H=0.508mm.As shown in Figure 3, closed loop rectangular microstrip line 33 and 35 sizes are identical, long L
2Be 7.9mm, wide L
1Be 4.4mm.The wide D of the dumbbell of dumbbell bandgap structure equals long E, is respectively 3mm; Dumbbell arm lengths L
3Be 1.5mm, fold-line-shaped band gap width C
1Be 0.1mm, length G is 1.1mm.Coupling width C between two fold-line-shaped dumbbell bandgap structure resonators
3Be 0.3mm.The coupling width C of parallel coupled line and fold-line-shaped dumbbell bandgap structure resonator
2Be 0.25mm, incoming feeder 31 is identical with output feeder 38 length, links to each other with parallel coupled line respectively, is centrosymmetric with the filter center point, and live width w is 1.56mm.
Traditional work in centre frequency be 7.38GHz traditional dumbbell bandgap structure band pass filter as shown in Figure 1.Closed loop rectangular microstrip line 13 and 15 sizes are identical, long L
2Be 7.9mm, wide L
1Be 4.4mm.The wide D of square dumbbell of dumbbell bandgap structure equals long E, is respectively 3mm; Dumbbell arm width C
1Be 0.2mm, length L
3Be 1.5mm.Coupling width C between two dumbbell bandgap structure resonators
3Be 0.3mm.The coupling width C of parallel coupled line and dumbbell bandgap structure resonator
2Be 0.25mm, incoming feeder 11 is identical with output feeder 18 length, links to each other with parallel coupled line respectively, is centrosymmetric with the filter center point, and live width w is 1.56mm.
Described signal input, output port with dumbbell bandgap structure band pass filter is the coaxial feed device, is positioned at the outer end of incoming feeder and output feeder.The commercial connector of SMA that the present embodiment is preferred 50 ohm is saved cost.
Fig. 4 is that centre frequency described in the utility model is the band pass filter frequency response curve with dumbbell bandgap structure of 6.16GHz, the logical scope of band be 6.10GHz to 6.25GHz ,-three dB bandwidth is 2.4%.The in-band insertion loss of this filter is approximately-1dB, return loss is approximately-30dB in the band, produced two transmission zeros respectively at 6.52GHz and 8.73GHz in stopband range, and the decay of dead-center position surpassed all-60dB, stopband has been had very strong inhibitory action.Fig. 2 is that centre frequency is the traditional dumbbell bandgap structure of having of 7.38GHz band pass filter frequency response curve, compare with Fig. 4, there is parasitic passband in traditional band pass filter passband right side, and there is not transmission zero, the center resonant frequency of filter is 7.38GHz,-three dB bandwidth is 3.6%, and return loss is approximately-15dB in the band.Therefore compare with the band pass filter of traditional dumbbell bandgap structure, the belt resistance inhibitor system of band pass filter described in the utility model will be apparently higher than traditional.
By Fig. 3 and shown in Figure 1, two kinds of band pass filter outside dimensions are identical, according to both work centre frequency ratio as can be known, the size of filter described in the utility model has dwindled 16% than the size of conventional filter.
The present embodiment changes the outline microstrip line length of fold-line-shaped dumbbell bandgap structure resonator and length and the width of inner fold-line-shaped dumbbell band gap, can be applicable to other frequencies.
Claims (5)
1. band pass filter with dumbbell bandgap structure, comprise incoming feeder, output feeder, two parallel coupled lines and two dumbbell bandgap structure resonators, its feature comprises: dumbbell bandgap structure resonator is comprised of closed loop rectangular microstrip line and dumbbell bandgap structure, wherein the dumbbell on dumbbell bandgap structure both sides partly is as broad as long square band gap, and middle dumbbell arm is the fold-line-shaped band gap.
2. a kind of band pass filter with dumbbell bandgap structure according to claim 1, its feature comprises: the fold-line-shaped band gap is positioned at dumbbell band gap centre position; The gap of fold-line-shaped band gap is rectangular configuration, and between each gap between the upper and lower every equate, left and right sides equal in length; Microstrip line between the fold-line-shaped band gap up and down width equate, left and right sides equal in length.
3. a kind of band pass filter with dumbbell bandgap structure according to claim 1, its feature comprises: two dumbbell bandgap structure resonator structures and size are identical.
4. a kind of band pass filter with dumbbell bandgap structure according to claim 1, its feature comprises: be rectangle coupling band gap between two dumbbell bandgap structure resonators.
5. a kind of band pass filter with dumbbell bandgap structure according to claim 1, its feature comprises: be rectangle coupling band gap in the middle of left parallel coupled line and the left dumbbell bandgap structure resonator, be rectangle coupling band gap in the middle of right parallel coupled line and the right dumbbell bandgap structure resonator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220749598 CN203242724U (en) | 2012-12-28 | 2012-12-28 | Band pass filter with dumbbell band gap structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220749598 CN203242724U (en) | 2012-12-28 | 2012-12-28 | Band pass filter with dumbbell band gap structures |
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| Publication Number | Publication Date |
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| CN203242724U true CN203242724U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220749598 Expired - Fee Related CN203242724U (en) | 2012-12-28 | 2012-12-28 | Band pass filter with dumbbell band gap structures |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108281738A (en) * | 2017-12-27 | 2018-07-13 | 厦门大学 | Bicyclic mode filter is coupled based on the cascade all-wave length of parallel coupled line head and the tail |
| CN110635204A (en) * | 2019-08-28 | 2019-12-31 | 电子科技大学 | Wide-stopband high-rejection band-pass cavity filter |
-
2012
- 2012-12-28 CN CN 201220749598 patent/CN203242724U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108281738A (en) * | 2017-12-27 | 2018-07-13 | 厦门大学 | Bicyclic mode filter is coupled based on the cascade all-wave length of parallel coupled line head and the tail |
| CN110635204A (en) * | 2019-08-28 | 2019-12-31 | 电子科技大学 | Wide-stopband high-rejection band-pass cavity filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20151228 |
|
| EXPY | Termination of patent right or utility model |