CN103187602A - Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading - Google Patents
Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading Download PDFInfo
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Abstract
The invention discloses a miniaturized controllable three-frequency filter based on open-circuit step impedance line loading. The miniaturized controllable three-frequency filter based on open-circuit step impedance line loading comprises an upper-layer micro-strip structure, a middle-layer dielectric substrate and a lower-layer grounding metal plate, wherein the upper-layer micro-strip structure is attached to the upper surface of the middle-layer dielectric substrate, and the lower-layer grounding metal plate is attached to the lower surface of the middle-layer dielectric substrate; the upper-layer micro-strip structure comprises a first feed line, a second feed line, a signal input end, a signal output end, a first resonator and a second resonator; the two resonators are arrayed into a centrosymmetric structure; and the first feed line and the second feed line are the same in structure and arrayed into a centrosymmetric structure, the first feed line is connected with the signal input end, the second feed line is connected with the signal output end, and coupling structures are formed between the first feed line and the first resonator, as well as between the second feed line and the second resonator respectively. The miniaturized controllable three-frequency filter based on open-circuit step impedance line loading disclosed by the invention has the advantages of being small in volume, high in selectivity, and convenient in controlling three centre frequencies.
Description
Technical field
The present invention relates to a kind of three frequency filters of miniaturization, it is little particularly to relate to a kind of volume, high selectivity,
Three convenient controls of centre frequency can be applicable to the multi-frequency communication system band pass filter in the radio-frequency (RF) front-end circuit.
Background technology
Current society, along with the fast development of multisystem radio communication and mobile communication technology, modern microwave, millimeter-wave systems rapidly to miniaturization, lightweight, high reliability, multifunctionality and cheaply direction develop.Filter also becomes hot issue as the Primary Component of radio system front end, and the filter of miniaturization, many passbands, high selectivity has very urgent demand.
The researcher has done big quantity research aspect radio-frequency filter both at home and abroad at present, has also obtained many achievements, and main traditional method for designing of comb filter can be divided into following three kinds.First method is to utilize a plurality of filter combination design multiband filters, comprises the combination of band pass filter and band stop filter, the combination of a plurality of band pass filters etc.The method for designing of the patent as bear army of Datang Mobile Communication Apparatus Co., Ltd---a kind of cascading filter and design apparatus (patent No. 200910241860.3) have proposed the junction filter of a kind of PFIR and cic filter cascade.Second method is that how the cover resonators make up by using, and different resonators produces different passbands, thereby reaches the effect that obtains many passbands.As paper B.-J. Chen, T.-M. Shen, and R.-B. Wu, " Design of tri-band filters with improved band allocation; " IEEE Trans. Microw. Theory Tech., vol. 57, no. 7, pp. 1790-1797, Jul. 2009 use two cover resonator combinations, wherein a cover resonator produces a passband, and two other passband of another set of generation has been realized the design of three passband band pass filters.The third method is to adopt more piece step electric impedance resonator structure,, crown prince monarch's good as silver among Xiao of Shanghai university, Huang Chunyan, Wang Yeqing, Lee patent---based on the super arrowband double frequency filter (patent No. 201210116440.4) of asymmetric stepped electric impedance resonator, utilize two joint step electric impedance resonators, recently obtain required resonance frequency by the impedance that changes the step electric impedance resonator, thereby realize the design of double frequency filter.The overall filter size of first and second kind method design is big, cost is high, is in a disadvantageous position in the increasingly competitive communications industry.Though and the filter of the third method design is simple in structure, volume is also very little, because its several frequencies influence each other, causes frequency to be not easy control, and pass band width also is not easy control.
In recent years, the center loaded structure is because favor simple in structure, that design conveniently is subjected to the researcher of numerous designing filters.Chinese scholar Zhang Xiuyin professor utilize open circuit minor matters line center loaded resonator structural design the easy double frequency filter of control of band connection frequency, obtained good effect.As X. Y. Zhang, J.-X. Chen, Q. Xue, and S.-M. Li, " Dual-band bandpass filter using stub-loaded resonators, " IEEE Microw. Wireless Compon.Lett., vol. 17, no. 8, pp. 583 – 585, Aug. 2007.And at Ming-Qi Zhou, Xiao-Hong Tang, and Fei Xiao, " Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths, " IEEE Microw. Wireless Compon. Lett., vol.18, no. 12, pp.779-781 is in Dec. 2008. articles, employing loads short circuit minor matters line in the middle of open-circuit line, designed the littler double frequency filter of size.What but they loaded is the minor matters line of impedance unanimity, and all is double-passband filter, does not utilize frequency band well, does not fully take into account the characteristics such as pass band width, the outer performance of band, transmission zero that coupled structure has determined filter.
Summary of the invention
Because the defective of existing method for designing, shortcoming such as make that existing multiband filter exists that volume is big, cost is high, frequency and passband are wayward.The objective of the invention is to overcome the prior art above shortcomings, a kind of controlled three frequency filters of miniaturization based on the loading of open circuit step impedance line of miniaturization are provided.
For realizing purpose of the present invention, the technical solution adopted in the present invention is as follows:
A kind of miniaturization controlled three that loads based on open circuit step impedance line is filter frequently, and it comprises upper strata microstrip structure, intermediate layer medium substrate and lower floor's grounding plate; The upper strata microstrip structure is attached to intermediate layer medium substrate upper surface, and lower floor's grounding plate is attached to intermediate layer medium substrate lower surface; The upper strata microstrip structure comprises first feed line, second feed line, signal input part, signal output part, first resonator and second resonator; Two resonators are arranged into centrosymmetric structure, and two resonator structures are identical; Resonator comprises the open circuit step impedance minor matters line of a main transmission line and a center loaded; First feed line, second feeder structure is identical and be arranged into centrosymmetric structure, first feed line is connected with signal input part, second feed line is connected with signal output part, and between first feed line and first resonator, all form coupled structure between second feed line and second resonator.
Further optimize symmetrical structure centered by the microstrip structure of described upper strata.
Further optimize, the main transmission line of first resonator comprises second microstrip line, the 3rd microstrip line and the tenth microstrip line, second microstrip line, one end open circuit, the other end links to each other with the 3rd microstrip line, the other end of the 3rd microstrip line links to each other with the tenth microstrip line, the other end open circuit of the tenth microstrip line, second microstrip line, the 3rd microstrip line and the tenth microstrip line are linked to be into symmetrical n shape structure in turn; The open circuit step impedance minor matters line of the center loaded of first resonator comprises the 4th microstrip line and the 5th microstrip line, the 4th microstrip line one end links to each other with the 3rd microstrip line, the other end links to each other with the 5th microstrip line, the other end open circuit of the 5th microstrip line, the 4th microstrip line, the 5th microstrip line connect into perpendicular " 1 " shape in turn, and the 4th microstrip line, the 5th microstrip line do not wait on width.
Further optimize, first feed line comprises first microstrip line, the 6th microstrip line, the 7th microstrip line and the 8th microstrip line, and wherein an end of first microstrip line links to each other with the 9th microstrip line, other end open circuit; The 6th microstrip line, the 7th microstrip line and the 8th microstrip line connect and compose n shape structure successively, the 6th microstrip line one end open circuit, and the 8th microstrip line one end links to each other with the 9th microstrip line; The 9th microstrip line is signal input part, and the 11 microstrip line is signal output part; Signal separates two-way to feed line then from the left end input of the 9th microstrip line, the coupling between feed line and resonator again, and signal enters into resonator, finally by the right-hand member output of the 11 microstrip line.
Further optimize the length L of main transmission line
1Second resonance frequency f for described filter
2/ 2nd of a corresponding wavelength X, namely
Wherein c is light wave or the propagation velocity of electromagnetic wave in vacuum or medium, L
1Be the length of main transmission line, and L
1Be the length sum of second microstrip line and the 3rd microstrip line of twice, ε
EffDielectric constant for the intermediate layer medium substrate;
And half of main transmission line length adds that step impedance minor matters line produces first frequency f
1With the 3rd frequency f
3, f wherein
1With f
3Satisfy
Z wherein
1Be the characteristic impedance of main transmission line, Z
3The characteristic impedance of the 5th microstrip line, R
zBe Z
1With Z
3Impedance ratio.
Further optimize, the material of upper strata microstrip structure and lower floor's grounding plate is the uniform copper of quality; The material of intermediate layer medium substrate is Rogers RO4003 medium substrate, and Rogers RO4003 parameters is as follows: dielectric constant is 3.38 ± 0.05, and fissipation factor is 0.0027, and conductive coefficient is 0.64W/(mK), volume resistance is 1.7 * 10
10M Ω .cm, sheet resistance is 4.2 * 10
9M Ω.
With respect to prior art, the present invention has following advantage and technique effect:
(1) multifrequency.The fast development of communication has proposed requirements such as miniaturization, integrated, high performance to the transceiver of communication system, adopt multifrequency antenna, multiband filter and multifrequency amplifier can realize above-mentioned requirements and save cost greatly.The invention provides a kind of multifrequency tunable filter, have broad application prospects and huge economic benefit.
The convenient control of the centre frequency of (2) three passbands.Regulate second centre frequency by the length of regulating main transmission line earlier, afterwards only by the total length of regulating the step impedance minor matters line of opening a way and the frequency that width is regulated the first and the 3rd passband.
(3) has high selectivity.In the present invention, adopt the minor matters line feed of cross-linked structure and open circuit, make the both sides of each passband have transmission zero to strengthen the selectivity of passband, make the selectivity of filter higher.
(4) volume is less.Cause the volume of filter excessive compared to using many cover resonators to produce comb filter, the present invention has only adopted two resonators, and how many volumes the open circuit step impedance line of center loaded does not increase, but but can produce three frequency bands, so that the volume of filter reduce greatly, for radio-frequency (RF) front-end circuit has been saved many spaces.
(5) cost is low.The present invention adopts open circuit step impedance minor matters line to load resonator design three filter frequently, the material of upper strata microstrip structure and lower floor's grounding plate all is copper, the material of intermediate layer medium substrate is Rogers RO4003 medium substrate, compared to existing many filters, volume is little and cost is low, has improved the market competitiveness of multiband filter in radio-frequency (RF) front-end circuit.
Description of drawings
Fig. 1 is the easy three passband bandpass filter structures figure of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
Fig. 2 is the easy three passband bandpass filter structures schematic diagrames of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
Fig. 3 a is the easy resonator structure of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
Fig. 3 b is the easy strange mould equivalent electric circuit of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
Fig. 3 c is the easy even mould equivalent electric circuit of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
Fig. 4 is the easy simulation result figure of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing, but the scope of protection of present invention is not limited to down the scope of example statement.
The controlled three frequency filters of miniaturization based on the loading of open circuit step impedance line of the high selectivity of the miniaturization of this example comprise upper strata microstrip structure, intermediate layer medium substrate and lower floor's grounding plate.The material of upper strata microstrip structure and lower floor's grounding plate is the uniform copper of quality, and the material of intermediate layer medium substrate is Rogers RO4003 medium substrate.The upper strata microstrip structure is attached to intermediate layer medium substrate upper surface, and lower floor's grounding plate is attached to intermediate layer medium substrate lower surface.The upper strata microstrip structure comprises first feed line, second feed line, signal input part, signal output part, the first resonator A and the second resonator B; Two resonators are arranged into centrosymmetric structure, and two resonator structures are identical; Resonator comprises the open circuit step impedance minor matters line of a main transmission line and a center loaded; First feed line, second feeder structure is identical and be arranged into centrosymmetric structure, first feed line is connected with signal input part, second feed line is connected with signal output part, and between first feed line and first resonator, all form coupled structure between second feed line and second resonator.
The first resonator A of upper left side sign comprises the open circuit step impedance minor matters line part of main transmission microstrip line part and center loaded as shown in Figure 1.Wherein main transmission line partly comprises second microstrip line 2, the 3rd microstrip line 3 and the tenth microstrip line 10, second microstrip line, 2 one ends open circuit, the other end links to each other with the 3rd microstrip line 3, the other end of the 3rd microstrip line 3 links to each other with the tenth microstrip line 10, the other end open circuit of the tenth microstrip line 10, second microstrip line 2, the 3rd microstrip line 3 and the tenth microstrip line 10 constitute symmetrical n shape structure; The second resonator B becomes centrosymmetric structure with the first resonator A, and identical with the structure of first resonator; The open circuit step impedance minor matters line of center loaded partly comprises the 4th microstrip line 4 and the 5th microstrip line 5, the 4th microstrip line 4 one ends link to each other with the 3rd microstrip line 3, the other end links to each other with the 5th microstrip line 5, the other end open circuit of the 5th microstrip line 5,4th, the 5th microstrip line 5 connects into perpendicular " 1 " shape in turn, but the 4th, the 5th microstrip line 5 does not wait on width.
First feed line part is made up of first microstrip line 1, the 6th microstrip line 6, the 7th microstrip line 7 and the 8th microstrip line 8, and wherein an end of first microstrip line 1 links to each other with the 9th microstrip line 9, other end open circuit; The 6th microstrip line 6, the 7th microstrip line 7 and the 8th microstrip line 8 connect and compose n shape structure successively, the 6th microstrip line 6 one ends open circuit, and the 8th microstrip line 8 one ends link to each other with the 9th microstrip line 9.The 9th microstrip line 9 is signal input parts, and the 11 microstrip line 11 is signal output parts.Signal separates two-way to feed line then from the left end input of the 9th microstrip line 9, the coupling between feed line and resonator again, and signal enters into resonator, finally by the right-hand member output of the 11 microstrip line 11.
As an example, in the three passband band pass filters, resonator, feed line, signal input output end part become centrosymmetric structure fully.
Fig. 3 a is the easy resonator structure of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization; Fig. 3 b is the easy strange mould equivalent electric circuit of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization; Fig. 3 c is the easy even mould equivalent electric circuit of three passband band pass filters of the center loaded open circuit step impedance line of control of frequency of the high selectivity of miniaturization;
In Fig. 3 a resonator structure, L
1Length for main transmission line.By even and odd mode analysis as can be known, the length L of main transmission line
1Second resonance frequency f for described three passband band pass filters
2/ 2nd of a corresponding wavelength X, namely
Wherein c is light wave or the propagation velocity of electromagnetic wave in vacuum or medium, L
1Be the length of main transmission line, and L
1Be the length sum of second microstrip line 2 and the 3rd microstrip line 3 of twice, ε
EffDielectric constant for the intermediate layer medium substrate.
And half of main transmission line length adds that step impedance minor matters line produces the first and the 3rd frequency.F wherein
1With f
3Relation be expressed as follows
Z wherein
1Be the characteristic impedance of main transmission line, Z
3The characteristic impedance of the 5th microstrip line 5, R
zBe Z
1With Z
3Impedance ratio.
By even and odd mode analysis as can be known, the length L of main transmission line
1Second resonance frequency f for described three passband band pass filters
2/ 2nd of a corresponding wavelength X, and half of main transmission line length adds that step impedance minor matters line produces the first and the 3rd frequency.Therefore can regulate second passband central frequency earlier, regulate the first and the 3rd frequency by length and the width of regulating open circuit step impedance minor matters line then.
Therefore when the main transmission line length L
1After fixing, by changing length and the width of open circuit step impedance minor matters line, namely change length and the width of the 4th, the 5th microstrip line 5, just can change the first and the 3rd resonance frequency.The operating frequency that designs three passband band pass filters is 1.5GHz, 2GHz and 3.65GHz, then the length of first microstrip line 1 is 25.4 ± 0.2 mm according to calculating as can be known, the length of second microstrip line 2 is 23 ± 0.2mm, the length of the 3rd microstrip line 3 is 14 ± 0.2mm, the length of the 4th microstrip line 4 is 14.2 ± 0.4mm, the length of the 5th microstrip line 5 is 8 ± 0.2mm, the length of the 6th microstrip line 6 is 21.3 ± 0.4mm, the length of the 7th microstrip line 7 is 4 ± 0.2mm, the length of the 8th microstrip line 8 is 23.1 ± 0.2mm, and the length of the 9th microstrip line 9 can be free.The width of first microstrip line 1 is 0.4 ± 0.2 mm, the width of second microstrip line 2 and the 3rd microstrip line 3 is 1 ± 0.2 mm, the width of the 4th microstrip line 4 is 1.4 ± 0.2mm, the width of the 5th microstrip line 5 is 0.4 ± 0.2mm, the 6th microstrip line 6, the width of the 7th microstrip line 7 and the 8th microstrip line 8 is 0.4 ± 0.2 mm, and the width of the 9th microstrip line 9 is 1.86 ± 0.2 mm.
As the above analysis, feed line, signal input output end do not influence the adjusting of filter frequencies.Therefore keep the length of feed line microstrip line, width constant, port lines length is free, the port lines width is constant, can regulate second passband central frequency earlier, regulate the first and the 3rd passband central frequency by length and the width of regulating open circuit step impedance minor matters line then, obtain three passband band pass filters of different center frequency.
In the three passband band pass filters of the center loaded open circuit step impedance line that the frequency of the high selectivity of above-mentioned miniaturization is easily controlled, the external mass factor mainly is to be controlled by the coupling between the feed line resonator, this section microstrip line and the control of the coupling between the resonator that is coupled together by first microstrip line and the 6th, the 7th, the 8th microstrip line just, what therefore influence the external mass factor is exactly length, width and the coupling gap of these several microstrip lines.Coupling between the resonator is determined by coupling distance and length between two resonators.Just can obtain suitable bandwidth by choosing suitable length and width.
Embodiment
The frequency of the high selectivity of miniaturization easily three passband band pass filters of the center loaded open circuit step impedance line of control structure as shown in Figure 1, relevant dimensions is as shown in Figure 2.The thickness of medium substrate is 0.81mm, and relative dielectric constant is 3.38, and loss angle tangent is 0.0027.Resonator is folded into n shape structure, filter becomes centrosymmetric structure can effectively reduce the size of filter.Each dimension of microstrip line parameter of seeing filter from Fig. 2 is as follows: L=25.4 ± 0.2 mm, L
2=15 ± 0.2 mm, L
3=23 ± 0.2 mm, L
4=21.3 ± 0.2 mm, L
5=8 ± 0.2 mm, L
6=14.2 ± 0.2 mm, L
7=23.5 ± 0.2 mm, W
1=1.92mm, W
2=1 ± 0.2 mm, W
3=0.4 ± 0.1 mm, W
4=1 ± 0.2mm, W
5=0.4 ± 0.1 mm, W
6=0.4 ± 0.1 mm, W
7=1.4 ± 0.2 mm, g
1=0.2 mm, g
2=0.3 mm, g
1=0.9 mm.The whole size of this filter is 0.167 λ
g* 0.24 λ
g, λ wherein
gIt is the guide wavelength of minimum band connection frequency.Select these microstrip lines length and width separately, to obtain transmission characteristic and out-of band rejection characteristic in required I/O impedance operator, the frequency band.Fig. 4 is according to above parameter, the simulation result figure of the filter that designs.S
11Expression return loss, S
21Loss is inserted in expression.As can be seen from the figure, three frequencies lay respectively at 1.5GHz, 2GHz, and 3.65GHz, the insertion loss of three passbands is respectively 1.7dB, 1.3dB, 1.3dB, return loss is all less than-10dB.The 3dB relative bandwidth is respectively 9.6%, 7.4%, and 9.8%.Eight transmission zeros lay respectively at 1.09GHz, 1.27GHz, 1.42GHz, 1.83GHz, 2.47GHz, 2.59GHz, 3.80 GHz, 4.39 GHz.These transmission zeros have greatly improved the selectivity of filter.From above index, the present invention has reached a reasonable effect.Emulation is finished by the commercial electromagnetism ZELAND of simulation software.
The above only is preferred embodiments of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the controlled three frequency filters of miniaturization that load based on open circuit step impedance line is characterized in that comprising upper strata microstrip structure, intermediate layer medium substrate and lower floor's grounding plate; The upper strata microstrip structure is attached to intermediate layer medium substrate upper surface, and lower floor's grounding plate is attached to intermediate layer medium substrate lower surface; The upper strata microstrip structure comprises first feed line, second feed line, signal input part, signal output part, first resonator and second resonator; Two resonators are arranged into centrosymmetric structure, and two resonator structures are identical; First resonator comprises the open circuit step impedance minor matters line of a main transmission line and a center loaded; First feed line, second feeder structure is identical and be arranged into centrosymmetric structure, first feed line is connected with signal input part, second feed line is connected with signal output part, and between first feed line and first resonator, all form coupled structure between second feed line and second resonator.
2. a kind of miniaturization controlled three that loads based on open circuit step impedance line according to claim 1 filters frequently is characterized in that symmetrical structure centered by the microstrip structure of described upper strata.
3. a kind of miniaturization controlled three that loads based on open circuit step impedance line according to claim 1 filters frequently, the main transmission line that it is characterized in that first resonator comprises second microstrip line, the 3rd microstrip line and the tenth microstrip line, second microstrip line, one end open circuit, the other end links to each other with the 3rd microstrip line, the other end of the 3rd microstrip line links to each other with the tenth microstrip line, the other end open circuit of the tenth microstrip line, second microstrip line, the 3rd microstrip line and the tenth microstrip line are linked to be into symmetrical n shape structure in turn; The open circuit step impedance minor matters line of the center loaded of first resonator comprises the 4th microstrip line and the 5th microstrip line, the 4th microstrip line one end links to each other with the 3rd microstrip line, the other end links to each other with the 5th microstrip line, the other end open circuit of the 5th microstrip line, the 4th microstrip line, the 5th microstrip line connect into perpendicular " 1 " shape in turn, and the 4th microstrip line, the 5th microstrip line do not wait on width.
4. a kind of miniaturization controlled three that loads based on open circuit step impedance line according to claim 1 filters frequently, it is characterized in that first feed line comprises first microstrip line, the 6th microstrip line, the 7th microstrip line and the 8th microstrip line, wherein an end of first microstrip line links to each other with the 9th microstrip line, other end open circuit; The 6th microstrip line, the 7th microstrip line and the 8th microstrip line connect and compose n shape structure successively, the 6th microstrip line one end open circuit, and the 8th microstrip line one end links to each other with the 9th microstrip line; The 9th microstrip line is signal input part, and the 11 microstrip line is signal output part; Signal separates two-way to feed line then from the left end input of the 9th microstrip line, the coupling between feed line and resonator again, and signal enters into resonator, finally by the right-hand member output of the 11 microstrip line.
5. a kind of miniaturization controlled three that loads based on open circuit step impedance line according to claim 1 filters frequently is characterized in that the length L of main transmission line
1Second resonance frequency f for described filter
2/ 2nd of a corresponding wavelength X, namely
Wherein c is light wave or the propagation velocity of electromagnetic wave in vacuum or medium, L
1Be the length of main transmission line, and L
1Be the length sum of second microstrip line and the 3rd microstrip line of twice, ε
EffDielectric constant for the intermediate layer medium substrate;
And half of main transmission line length adds that step impedance minor matters line produces first frequency f
1With the 3rd frequency f
3, f wherein
1With f
3Satisfy
Z wherein
1Be the characteristic impedance of main transmission line, Z
3The characteristic impedance of the 5th microstrip line, R
zBe Z
1With Z
3Impedance ratio.
6. a kind of controlled three frequency filters of miniaturization that load based on open circuit step impedance line according to claim 1 is characterized in that the material of upper strata microstrip structure and lower floor's grounding plate is the uniform copper of quality; The material of intermediate layer medium substrate is Rogers RO4003 medium substrate, and Rogers RO4003 parameters is as follows: dielectric constant is 3.38 ± 0.05, and fissipation factor is 0.0027, and conductive coefficient is 0.64W/(mK), volume resistance is 1.7 * 10
10M Ω .cm, sheet resistance is 4.2 * 10
9M Ω.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255123A (en) * | 2011-05-10 | 2011-11-23 | 清华大学 | High temperature superconductive microstrip filter with tap structure |
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
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- 2013-03-11 CN CN201310077583.3A patent/CN103187602B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255123A (en) * | 2011-05-10 | 2011-11-23 | 清华大学 | High temperature superconductive microstrip filter with tap structure |
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
Non-Patent Citations (2)
| Title |
|---|
| QING-XIN CHU ET AL.: "Novel UWB Bandpass Filter Using Stub-Loaded Multiple-Mode Resonator", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| 陈付昌 等: "基于组合多通带谐振器的三频滤波器设计", 《华南理工大学学报（自然科学版）》 * |
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