CN203760599U - Compact type ultra wide band double-band-notch balance band-pass filter - Google Patents
Compact type ultra wide band double-band-notch balance band-pass filter Download PDFInfo
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- CN203760599U CN203760599U CN201420147268.3U CN201420147268U CN203760599U CN 203760599 U CN203760599 U CN 203760599U CN 201420147268 U CN201420147268 U CN 201420147268U CN 203760599 U CN203760599 U CN 203760599U
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Abstract
The utility model discloses a compact type ultra wide band double-band-notch balance band-pass filter and belongs to technical field of wireless communication. The compact type ultra wide band double-band-notch balance band-pass filter comprises a first filter body, a second filter body and supplement structures. The first filter body and the second filter body are structurally symmetrical. Each of the first filter body and the second filter body comprises a micro-strip line structure formed on the upper layer of a medium substrate and a slot line structure formed on the lower layer of the medium substrate. In order to restrain common-mode harmonic waves and achieve the double-band-notch characteristic, the supplement structures are added to the micro-strip line structures on the upper layers. Each supplement structure comprises a first micro-strip branch, a second micro-strip branch, a first resonator, a second resonator, a third resonator and a fourth resonator, wherein the first resonator and the second resonator are parallelly disposed on two sides of the first micro-strip branch, and the third resonator and the fourth resonator are parallelly disposed on two sides of the second micro-strip branch. The compact type ultra wide band double-band-notch balance band-pass filter has wide different-mode signal passing band, has the double-band-notch characteristic, has high common-mode restraining characteristic in band, and is compact in structure, simple in circuit, and easy to machine.
Description
Technical field
The utility model relates to wireless communication technology field, relates in particular to the sunken balancing band bandpass filter of a kind of compact ultra broadband biobelt.
Background technology
The fast development of Modern Communication System is had higher requirement to the performance of filter, miniaturization, and high-performance, wide band filter is the requisite part of communication system.Balance filter can effectively suppress internal noise and the ambient noise of system, compares with common single-ended filter, has larger advantage.
When relative bandwidth surpasses 100%, the balancing band bandpass filter of design broadband or ultra broadband, when not only needing to guarantee low insertion loss, realizes the transmission of the difference mode signal of ultra broadband, and need to suppress the common-mode signal of ultra broadband, and guarantee that filter construction is compact.Therefore, how increasing the difference mode signal passband of balance filter and improve its common-mode signal inhibition is the difficult point of studying at present.According to practical application request, need design with the filter of trap characteristic, design band resistance-trap filter is also a study hotspot.
At present, the design of balancing band bandpass filter mainly contains following three kinds of methods: the first is the balance filter based on two-sided parallel strips structure, have good common mode inhibition characteristic, but internal circuit configuration is complicated, and size is very large, and cost of manufacture is very high; The second is that the design of its differential-mode response is relatively simple based on micro-balance filter with stepped impedance coupled line structure, and has good common mode inhibition characteristic, but the design of its common-mode response is loaded down with trivial details, and has significant limitation for broadband application; The third is based on micro-balance filter with the equilibrating of short circuit branch line band pass filter, it has the common mode inhibition characteristic in good differential mode band internal characteristic and band, and mentality of designing is comparatively simple, but its shortcoming is under differential mode Out-of-band rejection performance and under ultra broadband state common mode inhibition characteristic not good.
Utility model content
In order to address the above problem, the utility model proposes a kind of balancing band bandpass filter of the three die cavity line resonators based on folding, this filter has ultra broadband, biobelt falls into characteristic, in difference mode signal passband, there is higher common mode inhibition characteristic, compact conformation, circuit is simple, is easy to processing.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
The balancing band bandpass filter that compact ultra broadband biobelt is sunken, comprises the first filter, the second filter and supplementing structure;
Described the first filter comprises the first feeder line, the second feeder line, the first microstrip line open circuit minor matters, the second microstrip line open circuit minor matters and the first line of rabbet joint resonator;
One end of described the first feeder line is connected with tap line structure with the short-circuit end of the first microstrip line open circuit minor matters; One end of described the second feeder line is connected with tap line structure with the short-circuit end of the second microstrip line open circuit minor matters; The other end of the other end of described the first feeder line and the second feeder line input/output port that partners; Described the first microstrip line open circuit minor matters and the second microstrip line open circuit minor matters are parallel to each other; The three mould resonators that described the first line of rabbet joint resonator is foldable structure, by the first U-shaped resonator and the second U-shaped resonator, formed, described the first microstrip line open circuit minor matters relative position is in the first U-shaped resonator, and described the second microstrip line open circuit minor matters relative position is in the second U-shaped resonator;
Described the second filter comprises the 3rd feeder line, the 4th feeder line, the 3rd microstrip line open circuit minor matters, the 4th microstrip line open circuit minor matters, the second line of rabbet joint resonator;
One end of described the 3rd feeder line is connected with tap line structure with the short-circuit end of the 3rd microstrip line open circuit minor matters; One end of described the 4th feeder line is connected with tap line structure with the short-circuit end of the 4th microstrip line open circuit minor matters; The other end of the other end of described the 3rd feeder line and the 4th feeder line input/output port that partners; Described the 3rd microstrip line open circuit minor matters and the 4th microstrip line open circuit minor matters are parallel to each other; The three mould resonators that described the second line of rabbet joint resonator is foldable structure, opening direction is contrary with described the first line of rabbet joint resonator, by the 3rd U-shaped resonator and the 4th U-shaped resonator, formed, described the 3rd microstrip line open circuit minor matters relative position is in the 3rd U-shaped resonator, and described the 4th microstrip line open circuit minor matters relative position is in the 4th U-shaped resonator;
Described supplementing structure comprises first micro-band minor matters, second micro-band minor matters, the first resonator, the second resonator, the 3rd resonator, the 4th resonator;
Described first micro-one end with minor matters is connected with described the second feeder line, is parallel to the first micro-band open circuit minor matters, and both sides parallel the first resonator, the second resonator of being provided with respectively; Described second micro-one end with minor matters is connected with described the 4th feeder line, is parallel to the 4th micro-band open circuit minor matters, and both sides parallel the 3rd resonator, the 4th resonator of being provided with respectively; Described first to fourth resonator is short circuit grounding respectively, and first and second resonator is short-circuit end near one end of the second feeder line, and the 3rd and the 4th resonator is short-circuit end near one end of the 4th feeder line;
Described the first filter and described the second filter size are equal, symmetrical;
Wherein said the first feeder line and described the 3rd feeder line are symmetrical; Described the second feeder line and described the 4th feeder line are symmetrical; Described the first microstrip line open circuit minor matters and described the 3rd microstrip line open circuit minor matters are symmetrical; Described the second microstrip line open circuit minor matters and described the 4th microstrip line open circuit minor matters are symmetrical; Described the first line of rabbet joint resonator and described the second line of rabbet joint resonator are symmetrical about the plane of symmetry, and are connected in one on the plane of symmetry;
Described supplementing structure is symmetrical about the plane of symmetry of described the first filter and described the second filter;
Wherein said first micro-band minor matters and described second micro-band minor matters are symmetrical, and connect as one on the plane of symmetry; Described the first resonator and described the 3rd resonator are symmetrical; Described the second resonator and described the 4th resonator are symmetrical.
As the sunken further prioritization scheme of balancing band bandpass filter of a kind of compact ultra broadband of this law biobelt, described first to fourth feeder line characteristic impedance is 50 ohm.
As the sunken further prioritization scheme of balancing band bandpass filter of a kind of compact ultra broadband of this law biobelt, described first to fourth microstrip line open circuit minor matters length is 1/4th of passband centre frequency corresponding wavelength, and the length of described first to fourth resonator is respectively 1/4th of its corresponding trap place frequency corresponding wavelength.
Described balance filter has two input port: P
in1and P
in2, two output port: P
out1and P
out2(also can be simultaneously by P
out1and P
out2as input port, P
in1and P
in2as output port).
When difference mode signal enters system by input port Pin1 and input port Pin2, the part of this balance filter on plane of symmetry OPP ' O ' is equivalent to short circuit grounding, symmetry due to structure, along the plane of symmetry, this filter is divided into two-part structure, half structure of take is wherein example explanation, without loss of generality.The first microstrip line open circuit minor matters, the second microstrip line open circuit minor matters and the first line of rabbet joint resonator form the filter of a dual-port.The design of line of rabbet joint resonator folded form makes whole balance electric filter structure compact, and two microstrip lines are opened a way between minor matters and have cross-couplings between input and output, have introduced the transmission zero of two difference mode signals in passband edge.By regulating the width of microstrip line open circuit minor matters can obtain in good band, mate, thereby above-mentioned balance filter can transmit the difference mode signal in passband.In addition, one end that the first microstrip line minor matters are positioned at the plane of symmetry is equivalent to short circuit grounding, and the first resonator, the second resonator are placed on its both sides abreast, forms reverse quarter-wave resonance device group.The first resonator, the second resonator intercouple with first micro-band minor matters respectively, are not increasing under the prerequisite of balance filter size, introduce new transmission zero, introduce trap in passband.The size of the first resonator, the second resonator is different, the corresponding trap that produces two different frequencies in passband.Can, by regulating the length of quarter-wave resonance device, change sunken wave frequency.
When common-mode signal enters system by input port Pin1 and input port Pin2, the part of this balance filter on plane of symmetry OPP ' O ' is equivalent to open-circuit condition, now between the first line of rabbet joint resonator and the second line of rabbet joint resonator, present open-circuit condition, between input and output side, just there is not coupling, cause common-mode signal not transmit, effectively suppressed the common-mode signal except common mode harmonic wave in passband.In addition, between micro-feeder line that is positioned at input and output difference port with minor matters, introduce common mode transmission zero point, effectively suppressed common mode harmonic wave.
Compared with prior art, the beneficial effect that technique scheme has is: utilize two folding line of rabbet joint resonators and four microstrip line open circuit minor matters, form the transmission zero of two difference mode signals in passband edge, realize super wide passband.Utilize reverse quarter-wave resonance device group and micro-with the coupling between minor matters, form multiple transmission zero, effectively suppress common-mode signal, in super wide passband, form two stopbands simultaneously; What the utility model adopted is microstrip structure, is convenient to processing, and cost is low, and volume compact is easy to carry out integrated with other circuit.
Accompanying drawing explanation
Fig. 1 is the tangent plane schematic diagram of single-layer printed circuit plate;
Fig. 2 is balance filter superstructure schematic diagram;
Fig. 3 is balance filter understructure schematic diagram;
Fig. 4 is the equivalent electric circuit of balance filter under difference mode signal excitation;
Fig. 5 is emulation and the measurement result of difference mode signal insertion loss curve, difference mode signal return loss plot and the common-mode signal insertion loss curve of balance filter;
Fig. 6 is the test result of balance filter group delay.
In figure, 1: the first feeder line; 2: the second feeder lines; 3: the three feeder lines; 4: the four feeder lines; A1: the first microstrip line open circuit minor matters; A2: the second microstrip line open circuit minor matters; A3: the 3rd microstrip line open circuit minor matters; A4: the 4th microstrip line open circuit minor matters; B1: first micro-band minor matters; B2: second micro-band minor matters; C1: the first resonator; C2: the second resonator; C3: the 3rd resonator; C4: the 4th resonator; D1: the first line of rabbet joint resonator; D2: the second line of rabbet joint resonator; E1: substrate upper strata metal; E2: substrate lower metal; E3: medium; Pin1: first input end mouth; Pin2: the second input port; Pout1: the first output port; Pout2: the second output port; O1: the first through hole; O2: the second through hole; O3: third through-hole; O4: fourth hole; S
dd21: difference mode signal insertion loss curve; S
dd11: difference mode signal return loss plot; S
cc21: common-mode signal insertion loss curve.
Specific embodiments
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail:
The output port of balance filter described in the utility model and input port all adopt the welding of SMA head, so that access is tested or is connected with other circuit.
It is 2.2 that the utility model adopts relative dielectric constant, and thickness is 0.508mm, and the RT/Duriod5880 plate that fissipation factor is 0.0009 is made substrate, also can adopt the pcb board of other specifications to make substrate.As shown in Figure 1, on the upper and lower surface of the dielectric substrate E3 of pcb board, be covered with respectively metal level E1 and lower metal layer E2.The upper strata microstrip line construction of balance filter described in the utility model is upper metal layers E1, the i.e. etching formation on lower metal E2 of slot line structure.
Fig. 2 and Fig. 3 are respectively upper strata circuit structure and the lower circuit structures of described balance filter, wherein the upper strata microstrip line construction shown in Fig. 2 is the metal coating being printed on the E1 of medium substrate upper strata, and the metal ground plane of the slot line structure Shi Jiang medium substrate lower floor shown in Fig. 3 is etched away and forms after a part.Position relationship between the circuit of the upper and lower is consistent with Fig. 2 and Fig. 3.Described balance filter comprises the first filter and the second filter, and both symmetrical configuration are identical.Wherein the first filter comprises shown in Fig. 2: the first feeder line 1, the second feeder line 2, the first microstrip line open circuit minor matters A1, the second microstrip line open circuit minor matters A2, and the first line of rabbet joint resonator D1 that is positioned at medium substrate lower floor shown in Fig. 3; Wherein the short-circuit end of the first microstrip line open circuit minor matters A1 is connected with one end of the first feeder line 1, the short-circuit end of the second microstrip line open circuit minor matters A2 is connected with one end of the second feeder line 2, the first microstrip line open circuit minor matters A1 and the second microstrip line open circuit minor matters A2 are parallel to each other, and the other end of the first feeder line 1 and the second feeder line 2 is as input or output port.The three mould resonators that described the first line of rabbet joint resonator D1 is foldable structure, by the first U-shaped resonator and the second U-shaped resonator, formed, described the first microstrip line open circuit minor matters A1 relative position is in the first U-shaped resonator, and described the second microstrip line open circuit minor matters A2 relative position is in the second U-shaped resonator;
Described the second filter comprises shown in Fig. 2: the 3rd feeder line 3, the four feeder line 4, the three microstrip line open circuit minor matters A3, the 4th microstrip line open circuit minor matters A4, and the second line of rabbet joint resonator D2 shown in Fig. 3; Wherein the 3rd microstrip line open circuit minor matters A3 is connected with one end of the 3rd feeder line 3, the 4th microstrip line open circuit minor matters A4 is connected with one end of the 4th feeder line 4, the the 3rd and the 4th microstrip line open circuit minor matters are parallel to each other, and the other end of the 3rd feeder line 3 and the 4th feeder line 4 is as input or output port.The three mould resonators that described the second line of rabbet joint resonator D2 is foldable structure, by the 3rd U-shaped resonator and the 4th U-shaped resonator, formed, described the 3rd microstrip line open circuit minor matters A3 relative position is in the 3rd U-shaped resonator, and described the 4th microstrip line open circuit minor matters A4 relative position is in the 4th U-shaped resonator;
Described supplementing structure is as follows: first micro-one end with minor matters B1 is connected to the second feeder line 2, is parallel to the first micro-band open circuit minor matters A1, and parallel in its both sides have the first resonator C1, a second resonator C2; Second micro-one end with minor matters B2 is connected on the 4th feeder line 4, is parallel to the 4th micro-band open circuit minor matters A4, at the parallel placement in described minor matters both sides the 3rd resonator C3, the 4th resonator C4.First to fourth resonator C1-C4 is respectively by first to fourth through hole O1-O4 short circuit grounding, the first resonator C1 and the second resonator C2 are short-circuit end near one end of the second feeder line 2, and the 3rd resonator C3 and the 4th resonator C4 are short-circuit end near one end of the 4th feeder line 4.
Described the first filter and the second filter construction are symmetrical, size equates, wherein the first feeder line 1 and the 3rd feeder line 3 symmetries, the second feeder line 2 and the 4th feeder line 4 symmetries, the first microstrip line open circuit minor matters A1 and the 3rd microstrip line open circuit minor matters A3 are symmetrical, the second microstrip line open circuit minor matters A2 and the 4th microstrip line open circuit minor matters A4 are symmetrical, and the first line of rabbet joint resonator D1 and the second line of rabbet joint resonator D2 are symmetrical about the plane of symmetry, and are connected in one side by side on the plane of symmetry.Described supplementing structure is symmetrical about the plane of symmetry, i.e. first micro-band minor matters B1 and second micro-band minor matters B2 symmetrical configuration, size equates, on the plane of symmetry, connects as one, the first resonator C1 and the 3rd resonator C3 are symmetrical, and the second resonator C2 and the 4th resonator C4 are symmetrical.
When difference mode signal enters system by input port Pin1 and input port Pin2, the part of this balance filter on plane of symmetry OPP ' O ' is equivalent to short circuit grounding, as shown in Figure 4, wherein left figure is upper strata circuit equivalent structure to its equivalent electric circuit, and right figure is lower circuit equivalent structure.Due to the symmetry of structure, along the plane of symmetry, this filter is divided into two-part structure, half structure of take is wherein example explanation, without loss of generality.The first microstrip line open circuit minor matters A1, the second microstrip line open circuit minor matters A2 and the first line of rabbet joint resonator D1 form the filter of a two-port, and difference mode signal can normal transmission.The design of the folded form of the first line of rabbet joint resonator D1 makes whole balance electric filter structure compact, cross-couplings between cross-couplings between two microstrip lines open circuit minor matters A1 and A2 and input 1 and output 2, has introduced the transmission zero of two difference mode signals in passband edge.By regulating the width of microstrip line open circuit minor matters can obtain in good band, mate, thereby above-mentioned balance filter can transmit the difference mode signal in passband.In addition, one end that the first microstrip line minor matters B1 is positioned at the plane of symmetry is equivalent to short circuit grounding, and the first resonator C1, the second resonator C2 are placed on its both sides abreast, forms reverse quarter-wave resonance device group.The first resonator C1, the second resonator C2 intercouple with first micro-band minor matters B1 respectively, are not increasing under the prerequisite of balance filter size, introduce new transmission zero, introduce trap in passband.The size of the first resonator C1, the second resonator C2 is different, the corresponding trap that produces two different frequencies in passband.Can, by regulating the size of quarter-wave resonance device C1, C2, change sunken wave frequency.
When common-mode signal enters system by input port Pin1 and input port Pin2, the part of this balance filter on plane of symmetry OPP ' O ' is equivalent to open-circuit condition.Now between the first line of rabbet joint resonator D1 and the second line of rabbet joint resonator D2, present open-circuit condition, destroyed coupled structure, cause the common-mode signal can not normal transmission, effectively suppressed the common-mode signal except common mode harmonic wave in passband.In addition, the micro-band minor matters B1, the B2 that between the feeder line of input and output difference port, place, introduced common mode transmission zero point, effectively suppressed common mode harmonic wave.
Fig. 5 is difference mode signal insertion loss curve S dd21 and difference mode signal return loss plot Sdd11 and the cc21 emulation of common-mode signal insertion loss curve S and the measurement result of balance filter, what wherein emulation adopted is HFSS software, and what test adopted is Agilent N5230C vector network analyzer.Described balance filter actual measurement is consistent with simulation result as seen from the figure, has 94.8% relative bandwidth at 5.5GHz place, and differential mode insertion loss is 1.1dB, and return loss is better than 10dB.Actual measurement common-mode signal insertion loss is greater than 16dB in whole differential mode passband.Two differential mode transmission zeros are positioned at 1.13GHz and 8.88GHz place, have guaranteed very high frequency selectivity.Two sharp-pointed stopbands are positioned at 5.33 and 5.99GHz place, realize the characteristic of biobelt filling.
Fig. 6 is the test group delay of described balance filter, as seen in difference mode signal passband, group delay be 0.4ns between 0.6ns, group delay is very little, and has very smooth characteristic.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art, under the prerequisite that does not depart from the utility model principle, can also make some improvement, these improvement also should be considered as protection range of the present utility model.
Claims (3)
1. the sunken balancing band bandpass filter of compact ultra broadband biobelt, is characterized in that, comprises the first filter, the second filter and supplementing structure;
Described the first filter comprises the first feeder line, the second feeder line, the first microstrip line open circuit minor matters, the second microstrip line open circuit minor matters and the first line of rabbet joint resonator;
One end of described the first feeder line is connected with tap line structure with the short-circuit end of the first microstrip line open circuit minor matters; One end of described the second feeder line is connected with tap line structure with the short-circuit end of the second microstrip line open circuit minor matters; The other end of the other end of described the first feeder line and the second feeder line input/output port that partners; Described the first microstrip line open circuit minor matters and the second microstrip line open circuit minor matters are parallel to each other; The three mould resonators that described the first line of rabbet joint resonator is foldable structure, by the first U-shaped resonator and the second U-shaped resonator, formed, described the first microstrip line open circuit minor matters relative position is in the first U-shaped resonator, and described the second microstrip line open circuit minor matters relative position is in the second U-shaped resonator;
Described the second filter comprises the 3rd feeder line, the 4th feeder line, the 3rd microstrip line open circuit minor matters, the 4th microstrip line open circuit minor matters, the second line of rabbet joint resonator;
One end of described the 3rd feeder line is connected with tap line structure with the short-circuit end of the 3rd microstrip line open circuit minor matters; One end of described the 4th feeder line is connected with tap line structure with the short-circuit end of the 4th microstrip line open circuit minor matters; The other end of the other end of described the 3rd feeder line and the 4th feeder line input/output port that partners; Described the 3rd microstrip line open circuit minor matters and the 4th microstrip line open circuit minor matters are parallel to each other; The three mould resonators that described the second line of rabbet joint resonator is foldable structure, opening direction is contrary with described the first line of rabbet joint resonator, by the 3rd U-shaped resonator and the 4th U-shaped resonator, formed, described the 3rd microstrip line open circuit minor matters relative position is in the 3rd U-shaped resonator, and described the 4th microstrip line open circuit minor matters relative position is in the 4th U-shaped resonator;
Described supplementing structure comprises first micro-band minor matters, second micro-band minor matters, the first resonator, the second resonator, the 3rd resonator, the 4th resonator;
Described first micro-one end with minor matters is connected with described the second feeder line, is parallel to the first micro-band open circuit minor matters, and both sides parallel the first resonator, the second resonator of being provided with respectively; Described second micro-one end with minor matters is connected with described the 4th feeder line, is parallel to the 4th micro-band open circuit minor matters, and both sides parallel the 3rd resonator, the 4th resonator of being provided with respectively; Described first and second resonator short circuit grounding, one end of close the second feeder line is short-circuit end; The the described the 3rd and the 4th resonator short circuit grounding, one end of close the 4th feeder line is short-circuit end;
Described the first filter and described the second filter size are equal, symmetrical;
Wherein said the first feeder line and described the 3rd feeder line are symmetrical; Described the second feeder line and described the 4th feeder line are symmetrical; Described the first microstrip line open circuit minor matters and described the 3rd microstrip line open circuit minor matters are symmetrical; Described the second microstrip line open circuit minor matters and described the 4th microstrip line open circuit minor matters are symmetrical; Described the first line of rabbet joint resonator and described the second line of rabbet joint resonator are symmetrical about the plane of symmetry, and are connected in one on the plane of symmetry;
Described supplementing structure is symmetrical about the plane of symmetry of described the first filter and described the second filter;
Wherein said first micro-band minor matters and described second micro-band minor matters are symmetrical, and connect as one on the plane of symmetry; Described the first resonator and described the 3rd resonator are symmetrical; Described the second resonator and described the 4th resonator are symmetrical.
2. the sunken balancing band bandpass filter of compact ultra broadband biobelt according to claim 1, is characterized in that, described first to fourth feeder line characteristic impedance is 50 ohm.
3. the sunken balancing band bandpass filter of compact ultra broadband biobelt according to claim 1, it is characterized in that, described first to fourth microstrip line open circuit minor matters length is 1/4th of passband centre frequency corresponding wavelength, and the length of described first to fourth resonator is respectively 1/4th of its corresponding trap place frequency corresponding wavelength.
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|---|---|---|---|
| CN201420147268.3U CN203760599U (en) | 2014-03-28 | 2014-03-28 | Compact type ultra wide band double-band-notch balance band-pass filter |
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|---|---|---|---|
| CN201420147268.3U CN203760599U (en) | 2014-03-28 | 2014-03-28 | Compact type ultra wide band double-band-notch balance band-pass filter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915665A (en) * | 2014-03-28 | 2014-07-09 | 南京航空航天大学 | Compact type UWB dual-band trap balancing band-pass filter |
| CN104993195A (en) * | 2015-05-26 | 2015-10-21 | 华南理工大学 | Multi-transmission zero balancing filter using coupling feeder lines to perform loading |
| CN108155447A (en) * | 2017-12-14 | 2018-06-12 | 南京航空航天大学 | Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter |
| CN109066023A (en) * | 2018-08-13 | 2018-12-21 | 上海健康医学院 | A kind of microstrip line low-pass filter based on open-loop resonator |
| CN109301409A (en) * | 2018-09-07 | 2019-02-01 | 北京信息科技大学 | A kind of bandpass filter based on resonator based on via structure |
| CN109841933A (en) * | 2019-03-11 | 2019-06-04 | 南通大学 | A kind of Compact type broadband differential bandpass filter |
| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
-
2014
- 2014-03-28 CN CN201420147268.3U patent/CN203760599U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915665A (en) * | 2014-03-28 | 2014-07-09 | 南京航空航天大学 | Compact type UWB dual-band trap balancing band-pass filter |
| CN104993195A (en) * | 2015-05-26 | 2015-10-21 | 华南理工大学 | Multi-transmission zero balancing filter using coupling feeder lines to perform loading |
| CN104993195B (en) * | 2015-05-26 | 2018-01-16 | 华南理工大学 | A kind of more transmission zero balance filters loaded using coupling feed |
| CN108155447A (en) * | 2017-12-14 | 2018-06-12 | 南京航空航天大学 | Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter |
| CN109066023A (en) * | 2018-08-13 | 2018-12-21 | 上海健康医学院 | A kind of microstrip line low-pass filter based on open-loop resonator |
| CN109066023B (en) * | 2018-08-13 | 2024-02-13 | 上海健康医学院 | Microstrip low-pass filter based on open-loop resonator |
| CN109301409A (en) * | 2018-09-07 | 2019-02-01 | 北京信息科技大学 | A kind of bandpass filter based on resonator based on via structure |
| CN109841933A (en) * | 2019-03-11 | 2019-06-04 | 南通大学 | A kind of Compact type broadband differential bandpass filter |
| CN109841933B (en) * | 2019-03-11 | 2021-07-09 | 南通大学 | Compact broadband differential band-pass filter |
| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
| CN113193316B (en) * | 2021-04-30 | 2021-10-29 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
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