CN102361111A - Ultra-wideband (UWB) filter with band-notched characteristics - Google Patents
Ultra-wideband (UWB) filter with band-notched characteristics Download PDFInfo
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Abstract
The invention discloses an ultra-wideband (UWB) filter with band-notched characteristics. The UWB filter comprises a metal microstrip line at a front face part, a metal coating at a rear face part and a dielectric slab at a middle layer, wherein, the metal microstrip line is of a linear cascaded microstrip line structure which is formed by alternately connecting comb coupled microstrip lines with a quarter of wavelength and a microstrip line with half wavelength; the microstrip line with half wavelength is provided with microstrip slits; uniform transmission parts on the outer ends of the two comb coupled microstrip lines are respectively and electrically connected with input and output interfaces and two short-circuit stubs with a quarter of wavelength; and free ends of the short-circuit stubs with a quarter of wavelength are electrically connected with the metal coating at the rear face part. The UWB filter disclosed by the invention has the advantages of good band-notched characteristics, high coupling coefficient, small volume, easy machining process, steep sideband characteristics and good frequency selectivity, and a passband is internally provided with a steep trap with the relative width of more than 125%, thus meeting the requirement for miniaturization.
Description
Technical field
The present invention relates to a kind of filter of communication technical field, be specifically related to a kind of flat filter that has ultra broadband function, compact and have network interferences signal suppressing function.
Background technology
Along with developing rapidly of the communication technology, people to the information transmission system require increasingly high.Under this background, advantages such as the UWB super-broadband tech is simple with its system, cost is low, power consumption is little, data transmission bauds is fast, fail safe height become a research focus of the present communications field.Before the 90's of 20th century occurring from the sixties in 20th century, the UWB technology is main to adopt its initial pulse communication form, and is mainly used in the communication system of military radar and low intercepting and capturing rate.In recent years, along with the raising of the technology and the technology of microelectronic component, the UWB technology begins to be applied to civil area, and has started the upsurge to its research, development and application in the world.And the research of radio ultra wide band system and device thereof more and more receives people's attention, like UWB antenna, UWB filter, UWB amplifier etc.
In the prior art, parallel coupled line structure is compared with other coupling filter structures, just can access bigger coupling coefficient through the live width and the spacing of regulating parallel coupled line, thereby this structure usually is used to design the bigger microwave filter of relative bandwidth.But; Can produce some problems with parallel coupled structure design relative bandwidth greater than 100% ultra-wide band filter; Like Fig. 1, in filter, adopt traditional quarter-wave parallel coupled line structure, the filter volume can increase along with the increase of progression; Relative bandwidth can reduce, and parasitic passband or the like appears in the centre frequency place.
In recent years, the development of WLAN wireless local area network technology has been issued a lot of standards of IEEE802.11 series rapidly in succession.Wherein, 5.8GHz is the frequency of utilization section of WLAN, and for avoiding interfering with each other between WLAN and the UWB, we need produce a trap in the 5.8GHz of UWB filter frequency range.And the method that produces trap has a lot, roughly can be divided three classes: one type is to pass through SIR type minor matters of spacing coupling at resonator, and this method shortcoming is to increase the filter volume.Another kind of is in filter segment cascade 1/4th open circuit minor matters, like Fig. 3, adopts the quarter-wave open circuit minor matters structure of traditional realization trap characteristic, and shortcoming also is to increase the filter volume.Have one type to be on filter, to use the slit to produce a precipitous trap again, but before research mainly to concentrate be the gap structure that increases trap characteristic in input, also increased the filter volume.
The development of communication system at present, increasingly high to the sideband requirement of filter, the method that effectively improves the sideband characteristic of filter mainly contains two types: one is the progression that increases filter, and shortcoming is that the filter volume can be very big.One is to improve sideband characteristic through increase short circuit or open circuit minor matters.So seeking with the parallel coupled line structure is the basis, it is significant making the ultra-wide band filter with precipitous trap.But the function of present ultra-wide band filter is desirable not enough, can not satisfy various different field to wilderness demand high-quality, high performance filter.
Summary of the invention
The objective of the invention is to overcome the not enough of prior art and a kind of ultra-wide band filter with trap characteristic is provided, this filter has good trap characteristic, and coupling coefficient is high; Volume is little, and processing has a precipitous trap in the passband easily; And relative bandwidth is greater than 125%; Precipitous sideband characteristic is arranged, good frequency selectivity is arranged, realized the requirement of miniaturization.
For reaching the foregoing invention purpose, design of the present invention is:
1. in order to increase the coupling coefficient of coupled structure, on the basis of the parallel coupling of transmission, propose four novel line coupled structures, realized better filtering performance.
2. be in passband, to increase a precipitous trap, and do not increase the volume of filter, we are employed on the half-wavelength microstrip line and slot, i.e. microstrip gap.
3. connect two short circuit minor matters at the input/output port place, realized the precipitous characteristic of sideband,, adopted the short circuit mode of metal throuth hole in order to make filter be easier to processing.
4. the present invention adopts following dielectric-slab material: it is
=9.8 that medium substrate is selected dielectric constant for use, thickness h=1.27mm.
5. the circuit board after the processing is divided into three layers; Promptly the front is the metal micro-strip line structure, and the centre is medium flaggy, metal throuth hole and input/output port, and the medium sheet material back side is layer of metal coating; Wherein welding two sub-miniature A connectors in input/output port place are used for actual measurement.The front metal microstrip line construction is the short circuit minor matters that have metal throuth hole by two sections, and two section four line coupled structure and one section apertured microstrip line construction are formed, and have realized the ultra broadband filtering characteristic of precipitous trap.
According to the foregoing invention design, the present invention adopts following technical proposals:
A kind of ultra-wide band filter with trap characteristic comprises the metal micro-strip line of positive part, the coat of metal of reverse side part and the dielectric-slab in intermediate layer, and the dielectric-slab in intermediate layer has two sub-miniature A connectors, and said sub-miniature A connector is electrically connected with input/output interface respectively.Metal micro-strip line is connected to form linear pattern cascade microstrip line construction at interval by the microstrip line of quarter-wave pectination coupled microstrip line and half-wavelength; The microstrip line of half-wavelength has microstrip gap; The two ends of linear pattern cascade microstrip line construction are respectively equipped with two sections pectination coupled microstrip lines; The feed-in of linear pattern cascade microstrip line construction and the two ends that feed out electromagnetic signal are respectively the even transport part, outer end of two pectination coupled microstrip lines; The end of the inner evenly transport part of pectination coupled microstrip line and the microstrip line of half-wavelength electrically connects; Even transport part, the outer end of pectination coupled microstrip line is all non-coupling part with inner evenly transport part; Even transport part, the outer end of two pectination coupled microstrip lines electrically connects with input/output interface respectively; Even transport part, the outer end of two pectination coupled microstrip lines also electrically connects with two sections quarter-wave short circuit minor matters respectively, and the short circuit minor matters are parallelly connected with linear pattern cascade microstrip line construction, i.e. the coat of metal of the free end of quarter-wave short circuit minor matters and reverse side part electrically connects.
As a kind of technical scheme of the present invention; Above-mentioned metal micro-strip line is become with two sections short circuit minor matters by two sections pectination coupled microstrip lines, one section half-wavelength microstrip line; In the middle of the half-wavelength microstrip line is positioned at; Two sections pectination coupled microstrip lines are symmetricly set in the both sides of half-wavelength microstrip line respectively, and two sections pectination coupled microstrip lines and one section half-wavelength microstrip line form the linear pattern cascade microstrip line construction of brief formula.
Above-mentioned pectination coupled microstrip line is formed through identical gap four line interleaves coupling by four sections identical microstrip lines; Two sections non-conterminous microstrip lines wherein electrically connect through the microstrip line two ends of inner evenly transport part of pectination coupled microstrip line and half-wavelength; In addition two sections adjacent microstrip lines and the even transport part electric connection of the outer end of pectination coupled microstrip line; Two sections adjacent microstrip lines that are connected with the microstrip line of half-wavelength insert in other two sections formed spaces of non-conterminous microstrip line; Form the pectination coupling microstrip line structure of one group of four line interleave,, realized better new coupled structure of performance with traditional parallel coupled structure property ratio.
Above-mentioned half-wavelength microstrip line comprises a closed loop microstrip line with internal voids; In internal voids, draw one section open microstrip line of finger-type that is electrically connected with the closed loop microstrip line, form the microstrip gap of the uniform U-shaped of width between open microstrip line of finger-type and the closed loop microstrip line.Gap structure in the half-wavelength microstrip line of the present invention has been realized the precipitous trap characteristic of 5.8GHz, and does not increase the volume of filter.
Above-mentioned quarter-wave short circuit minor matters are vertical with four of the pectination coupled microstrip line even microstrip lines parallel to each other, strengthened the sideband characteristic of filter.
As improvement of the present invention, the dielectric-slab in above-mentioned intermediate layer has two plated-through holes, and plated-through hole electrically connects the free end of short circuit minor matters and the coat of metal of reverse side part.
The free end of short circuit minor matters is electrically connected with a metal connecting portion; The metal connecting portion directly electrically connects through the coat of metal of plated-through hole and reverse side part; Make the short circuit minor matters and the coat of metal realize electrically connecting indirectly; The metal connecting portion has a through hole measure-alike with plated-through hole, that the position is corresponding, makes filter be easier to processing and fabricating.
The shape and size of two sections above-mentioned pectination coupled microstrip lines are identical, position, left and right sides symmetry.
The shape and size of two sections above-mentioned short circuit minor matters are identical, position, left and right sides symmetry.
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art:
1. the present invention adopts four novel line coupled structures, and with traditional parallel coupled structure property ratio, volume is identical, but it is better to have band-pass behavior, the advantage that the passband relative bandwidth is bigger.
2. realize trap characteristic at the inner microstrip gap that adopts of filter, can realize more precipitous trap characteristic, and can extra increase filter volume.
3. adopt parallelly connected short circuit minor matters,, can largely improve the outer performance of filter band though do not produce transmission zero.
4. what the feeder line mode of this resonator structure adopted is direct access, and directly access method is that to use characteristic impedance be that 50 ohm microstrip line is directly received on the resonator.
5. have in the good band and the band external characteristic, simple in structure, be easy to processing.
Description of drawings
Fig. 1 is the quarter-wave parallel coupled line structure sketch map of prior art filter.
Fig. 2 is the open circuit minor matters structural representation with trap characteristic of prior art filter.
Fig. 3 is four line coupled structure sketch mapes of filter of the present invention.
Fig. 4 is the microstrip gap structural representation of the realization trap characteristic of filter of the present invention.
Fig. 5 is the ultra-wide band filter structural representation that the present invention has good trap characteristic.
Fig. 6 is the frequency response intention of the ultra-wide band filter of the present invention with good trap characteristic.
Embodiment
The preferred embodiments of the present invention accompanying drawings is following:
Embodiment one:
Referring to Fig. 3 and Fig. 4; A kind of ultra-wide band filter with trap characteristic; Comprise the metal micro-strip line of positive part, the coat of metal 8 of reverse side part and the dielectric-slab 9 in intermediate layer; The dielectric-slab 9 in intermediate layer has two sub-miniature A connectors; Input/output interface 1 is electrically connected with sub-miniature A connector respectively with input/output interface 5; It is characterized in that: metal micro-strip line is connected to form linear pattern cascade microstrip line construction at interval by the microstrip line 4 of quarter-wave pectination coupled microstrip line 2 and half-wavelength; The microstrip line 4 of half-wavelength has microstrip gap 3, and the two ends of linear pattern cascade microstrip line construction are respectively equipped with two sections pectination coupled microstrip lines 2, and the feed-in of linear pattern cascade microstrip line construction and the two ends that feed out electromagnetic signal are respectively the even transport part, outer end of two pectination coupled microstrip lines 2; The end of the inner evenly transport part of pectination coupled microstrip line 2 and the microstrip line 4 of half-wavelength electrically connects; Even transport part, the outer end of pectination coupled microstrip line 2 is all non-coupling part with inner evenly transport part, and even transport part, the outer end of two pectination coupled microstrip lines 2 electrically connects with input/output interface 1 and input/output interface 5 respectively, and even transport part, the outer end of two pectination coupled microstrip lines 2 also electrically connects with two sections quarter-wave short circuit minor matters 7 respectively; Short circuit minor matters 7 are parallelly connected with linear pattern cascade microstrip line construction, i.e. the coat of metal 8 of the free end of quarter-wave short circuit minor matters 7 and reverse side part electrically connects.In the present embodiment, on the basis of the parallel coupling of transmission, quarter-wave pectination coupled microstrip line 2 increases the coupling coefficient of coupled structure, can realize better filtering performance; Be employed in fluting on the microstrip line 4 of half-wavelength, i.e. microstrip gap, making increases a precipitous trap in the passband, and does not increase the volume of filter; Be connected two sections quarter-wave short circuit minor matters 7 at input/output interface 1 respectively with input/output interface 5 places, realized the precipitous characteristic of sideband.What the feeder line mode of this resonator structure adopted is direct access, and directly access method is that to use characteristic impedance be that 50 ohm microstrip line is directly received on the resonator.
Referring to Fig. 5; The metal micro-strip line of present embodiment preferably is made up of two sections pectination coupled microstrip lines 2, one section half-wavelength microstrip line 4 and two sections short circuit minor matters 7; In the middle of half-wavelength microstrip line 4 is positioned at; Two sections pectination coupled microstrip lines 2 are symmetricly set in the both sides of half-wavelength microstrip line 4 respectively, the linear pattern cascade microstrip line construction of two sections pectination coupled microstrip lines 2 and one section brief formula of half-wavelength microstrip line 4 formation.The present embodiment ultra-wide band filter comprises three-decker: the front comprises two sections quarter-wave short circuit minor matters 7, two sections pectination coupled microstrip lines 2 and one section half-wavelength microstrip line 4; The centre comprises the sub-miniature A connector of dielectric layer, input and output, and the back side comprises the complete coat of metal.
The pectination coupled microstrip line 2 of present embodiment is formed through identical gap four line interleaves coupling by four sections identical microstrip lines; Two sections non-conterminous microstrip lines wherein electrically connect through microstrip line 4 two ends of pectination coupled microstrip line 2 inner evenly transport parts and half-wavelength; In addition two sections adjacent microstrip lines and the even transport part electric connection of the outer end of pectination coupled microstrip line 2; Two sections adjacent microstrip lines that are connected with the microstrip line 4 of half-wavelength insert in other two sections formed spaces of non-conterminous microstrip line, form pectination coupled microstrip line 2 structures of one group of four line interleave.The novel four line coupled structures such as the sketch map of present embodiment are as shown in Figure 3; It is improved on the basis of traditional parallel coupled line structure as shown in Figure 1, and with traditional parallel coupled structure property ratio, volume is identical; But it is better to have band-pass behavior, the advantage that the passband relative bandwidth is bigger.Four line coupled structures have overcome parallel coupled structure the very high shortcoming of gap precision have been realized bigger coupling coefficient simultaneously, have better echoing characteristics, have increased coupling performance, make that the filtering performance of filter in passband is better.
The half-wavelength microstrip line 4 of present embodiment comprises a closed loop microstrip line with internal voids; In internal voids, draw one section open microstrip line of finger-type that is electrically connected with the closed loop microstrip line, form the microstrip gap 3 of the uniform U-shaped of width between open microstrip line of finger-type and the closed loop microstrip line.The method that increases trap characteristic in the band is a lot; Usually adopt two kinds: a kind of is in the quarter-wave open circuit minor matters of input and output quarter-wave strong point parallel connection; This method shortcoming filter volume increases, and is the quarter-wave open circuit minor matters structural representation of traditional realization trap characteristic like Fig. 2; Another kind can be realized trap characteristic at the inner microstrip gap 3 that adopts of filter; This method can realize more precipitous trap characteristic, and can extra increase filter volume, in the present embodiment; The attainable precipitous trap characteristic of microstrip gap 3 structures that adopts, as shown in Figure 4.
Referring to Fig. 5, the quarter-wave short circuit minor matters 7 of present embodiment are vertical with four of pectination coupled microstrip line 2 even microstrip lines parallel to each other.The method that improves filter band external characteristic roughly can be divided into: the one, increase filter order, and shortcoming is that the filter volume is too big.Another kind is parallelly connected minor matters; Wherein comprise two kinds of employing open circuit or short circuit minor matters again; Adopt the open circuit minor matters to increase transmission zero at the passband two ends, improve the band external characteristic, shortcoming is that the relative bandwidth of passband can not surpass 110%; Though and short circuit minor matters 7 do not produce transmission zero, can largely improve the outer performance of filter band.
Embodiment two:
Present embodiment and embodiment one are basic identical, and special feature is:
Referring to Fig. 5, the dielectric-slab 9 in the intermediate layer of present embodiment has two plated-through holes 6, and plated-through hole 6 electrically connects the free end of short circuit minor matters 7 and the coat of metal 8 of reverse side part.The dielectric-slab 9 in the intermediate layer of present embodiment has adopted the short circuit mode of plated-through hole 6.
In order to make filter be easier to processing and fabricating; The free end of short circuit minor matters 7 preferably is electrically connected with a metal connecting portion; The metal connecting portion directly electrically connects through the coat of metal 8 of plated-through hole 6 with the reverse side part; Make the short circuit minor matters 7 and the coat of metal 8 realize electrically connecting indirectly, the metal connecting portion has a through hole 6 measure-alike with plated-through hole, that the position is corresponding.
The shape and size of two sections pectination coupled microstrip lines 2 of the foregoing description are identical, position, left and right sides symmetry.Be convenient to processing and fabricating, the scope of convenient adjustment and definite passband.
The shape and size of two sections short circuit minor matters 7 of the foregoing description are identical, position, left and right sides symmetry.Be convenient to processing and fabricating, be convenient to adjust the realization effect of the precipitous characteristic of sideband.
The ultra-wide band filter that this is novel with good trap characteristic; Comprise three-decker: the front comprises two sections quarter-wave short circuit minor matters 7, four line coupling microstrip line structures and has half-wavelength microstrip line 4 structures of microstrip gap; The centre comprises the sub-miniature A connector of dielectric layer, two metal throuth holes, input and output, and the back side comprises the complete coat of metal.Metal micro-strip line, middle metal throuth hole part, the coat of metal of reverse side part can be electric conductivity preferred metal materials, like gold or silver or copper.The dielectric constant of the dielectric-slab in intermediate layer can be various numerical value, because square being inversely proportional to of the length of dielectric constant and resonator, so the size of the high more then respective filter of dielectric constant is more little.
Embodiment three:
Present embodiment and embodiment one are basic identical with embodiment two, and special feature is:
Fig. 5 is the structural representation of present embodiment, through design, emulation and optimization, confirms that finally the main material parameter of the novel ultra-wide band filter with good trap characteristic is following with concrete size:
The dielectric-slab 9 in intermediate layer is the dielectric-slab of dielectric constant
=9.8; This dielectric-slab thickness h=1.27mm, plated-through hole 6 covers conducting metal for punching back inwall; The length of four line interleave coupled microstrip lines of pectination coupled microstrip line 2 is all L3=4.4mm, and its width is all W1=0.1mm, the gap width G=0.1mm of adjacent coupled microstrip line; The total length L 4=8.4mm of the microstrip line 4 of half-wavelength; Its overall width W5=1.7mm; Its internal voids length L 5=5.9mm, its internal voids width W 2=0.2mm, the distance W 4=0.6mm of the closed loop microstrip line of the open end of the open microstrip line of its finger-type and the microstrip line 4 of said half-wavelength; The length L 1=4.4mm of short circuit minor matters 7, its width W 3=0.3mm; Radius R=the 0.92mm of plated-through hole 6; The metal connecting portion is L2=1.32mm along the length of said short circuit minor matters 7 bearing of trends.
Referring to Fig. 6, having designed centre frequency based on said method is 6.65GHz, and relative bandwidth is about 126.3% ultra-wide band filter, and HFSS carries out emulation through Electromagnetic Simulation software, debugging.
Referring to Fig. 6; Shown among the figure that present embodiment has the frequency response of the ultra-wide band filter of good trap characteristic, two sidebands that the result shows the present embodiment filter are steeper all, and in-band insertion loss is less; The trap of 5.8GHz in the band is very precipitous, and relative bandwidth reaches 126.3%.And Filter Structures is simple, has not only realized the precipitous trap characteristic of 5.8GHz, has effectively avoided the system interference with WLN, and has realized miniaturization.
Above result shows:
1. pass band width is about 8.4GHz, and in-band insertion loss is all less than 0.2dB.
2. passband is precipitous by the edge.
3. the trap centre frequency is 5.8GHz, inserts loss and reaches 25dB, and trap-three dB bandwidth is merely 0.2GHz, has reached precipitous characteristic.
4. in the band, band is outer functional, and is simultaneously simple in structure, is easy to processing.
Combine accompanying drawing that the embodiment of the invention is illustrated above; But the invention is not restricted to the foregoing description; Can also make multiple variation according to the purpose of innovation and creation of the present invention, change, the modification of making under all spirit and principles according to technical scheme of the present invention, substitute, combination, simplify, all should be the substitute mode of equivalence; As long as meet the structure and the aufbauprinciple of ultra-wide band filter, all belong to protection scope of the present invention with trap characteristic.
Claims (10)
1. ultra-wide band filter with trap characteristic; Comprise the metal micro-strip line of positive part, the coat of metal (8) of reverse side part and the dielectric-slab (9) in intermediate layer; The dielectric-slab in said intermediate layer (9) has two sub-miniature A connectors; Said sub-miniature A connector is electrically connected with input/output interface (1,5) respectively; It is characterized in that: said metal micro-strip line is connected to form linear pattern cascade microstrip line construction at interval by the microstrip line (4) of quarter-wave pectination coupled microstrip line (2) and half-wavelength; The microstrip line of said half-wavelength (4) has microstrip gap (3); The two ends of said linear pattern cascade microstrip line construction are respectively equipped with two sections pectination coupled microstrip lines (2); The feed-in of said linear pattern cascade microstrip line construction and the two ends that feed out electromagnetic signal are respectively the even transport part, outer end of two said pectination coupled microstrip lines (2); The end of the inner evenly transport part of said pectination coupled microstrip line (2) and the microstrip line (4) of said half-wavelength electrically connects; The even transport part, outer end of said pectination coupled microstrip line (2) is all non-coupling part with inner evenly transport part, and the even transport part, outer end of two said pectination coupled microstrip lines (2) electrically connects with input/output interface (1,5) respectively, and the even transport part, outer end of two said pectination coupled microstrip lines (2) also electrically connects with two sections quarter-wave short circuit minor matters (7) respectively; Said short circuit minor matters (7) are parallelly connected with said linear pattern cascade microstrip line construction, and the coat of metal (8) of the free end of promptly said quarter-wave short circuit minor matters (7) and said reverse side part electrically connects.
2. the ultra-wide band filter with trap characteristic according to claim 1; It is characterized in that: said metal micro-strip line is made up of two sections pectination coupled microstrip lines (2), one section half-wavelength microstrip line (4) and two sections short circuit minor matters (7); In the middle of said half-wavelength microstrip line (4) is positioned at; Two sections said pectination coupled microstrip lines (2) are symmetricly set in the both sides of said half-wavelength microstrip line (4) respectively, and two sections said pectination coupled microstrip lines (2) and one section said half-wavelength microstrip line (4) form the linear pattern cascade microstrip line construction of brief formula.
3. the ultra-wide band filter with trap characteristic according to claim 1 and 2; It is characterized in that: said pectination coupled microstrip line (2) is formed through identical gap four line interleaves coupling by four sections identical microstrip lines; Two sections non-conterminous microstrip lines wherein electrically connect through microstrip line (4) two ends of inner evenly transport part of said pectination coupled microstrip line (2) and said half-wavelength; In addition two sections adjacent microstrip lines and the even transport part electric connection of the outer end of said pectination coupled microstrip line (2); Two sections adjacent microstrip lines that are connected with the microstrip line (4) of said half-wavelength insert in other two sections formed spaces of non-conterminous microstrip line, form pectination coupled microstrip line (2) structure of one group of four line interleave.
4. the ultra-wide band filter with trap characteristic according to claim 3; It is characterized in that: said half-wavelength microstrip line (4) comprises a closed loop microstrip line with internal voids; In said internal voids, draw one section open microstrip line of finger-type that is electrically connected with said closed loop microstrip line, form the microstrip gap (3) of the uniform U-shaped of width between open microstrip line of said finger-type and the said closed loop microstrip line.
5. the ultra-wide band filter with trap characteristic according to claim 4 is characterized in that: said quarter-wave short circuit minor matters (7) are vertical with four of said pectination coupled microstrip line (2) even microstrip lines parallel to each other.
6. the ultra-wide band filter with trap characteristic according to claim 5; It is characterized in that: the dielectric-slab in said intermediate layer (9) has two plated-through holes (6), and said plated-through hole (6) electrically connects the free end of said short circuit minor matters (7) and the coat of metal (8) of said reverse side part.
7. the ultra-wide band filter with trap characteristic according to claim 6; It is characterized in that: the free end of said short circuit minor matters (7) is electrically connected with a metal connecting portion; Said metal connecting portion directly electrically connects through the coat of metal (8) of said plated-through hole (6) with said reverse side part; Make the said short circuit minor matters (7) and the said coat of metal (8) realize electrically connecting indirectly, said metal connecting portion has a through hole measure-alike with said plated-through hole (6), that the position is corresponding.
8. the ultra-wide band filter with trap characteristic according to claim 4 is characterized in that: the shape and size of two sections said pectination coupled microstrip lines (2) are identical, position, left and right sides symmetry.
9. the ultra-wide band filter with trap characteristic according to claim 8 is characterized in that: the shape and size of two sections said short circuit minor matters (7) are identical, position, left and right sides symmetry.
10. the ultra-wide band filter with trap characteristic according to claim 9 is characterized in that: the main material parameter of the ultra-wide band filter of characteristic is following with concrete size:
The dielectric-slab 9 in said intermediate layer is a dielectric constant
=9.8 dielectric-slab, this dielectric-slab thickness
h=1.27mm, plated-through hole 6 covers conducting metal for punching back inwall;
The length of four line interleave coupled microstrip lines of said pectination coupled microstrip line (2) is all L3=4.4mm, and its width is all W1=0.1mm, the gap width G=0.1mm of adjacent coupled microstrip line;
The total length L 4=8.4mm of the microstrip line of said half-wavelength (4); Its overall width W5=1.7mm; Its internal voids length L 5=5.9mm; Its internal voids width W 2=0.2mm, the distance W 4=0.6mm of the closed loop microstrip line of the microstrip line (4) of the open end of the open microstrip line of its finger-type and said half-wavelength;
The length L 1=4.4mm of said short circuit minor matters (7), its width W 3=0.3mm;
Radius R=the 0.92mm of said plated-through hole (6);
Said metal connecting portion is L2=1.32mm along the length of said short circuit minor matters (7) bearing of trend.
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| KR101870201B1 (en) * | 2017-03-03 | 2018-06-22 | 광운대학교 산학협력단 | A compact bandstop filter using frequency-selecting coupling structure with interdigital and spiral types |
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