CN203166046U - Ultra wide band filter based on double-stub-loaded resonator - Google Patents
Ultra wide band filter based on double-stub-loaded resonator Download PDFInfo
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- CN203166046U CN203166046U CN 201220695720 CN201220695720U CN203166046U CN 203166046 U CN203166046 U CN 203166046U CN 201220695720 CN201220695720 CN 201220695720 CN 201220695720 U CN201220695720 U CN 201220695720U CN 203166046 U CN203166046 U CN 203166046U
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Abstract
The utility model discloses a ultra wide band filter based on a double-stub-loaded resonator. The filter comprises a microstrip substrate, a right side portion, a reverse side portion and input/output ports. The right side portion and the reverse side portion are located on two sides of the microstrip substrate. The reverse side portion is served as a metal grounding plate of the filter. There are two input/output ports which are a first input/output port and a second input/output port. The right side portion comprises a first uniform transmission line unit, a second uniform transmission line unit, a first parallel coupling feed line, a second parallel coupling feed line and the double-stub-loaded resonator. The structure of the utility model is compact, the size is small, cost is low and a characteristic is good.
Description
Technical field
The utility model relates to the technical field of filter, particularly a kind of ultra-wide band filter that loads resonator based on two minor matters.
Background technology
Ultra broadband (UWB) filter has multiple application.Civilian aspect ultra-wideband pulse Radio Transmission Technology (military has just begun its research as far back as the seventies) is a kind of revolutionary wireless communication technology that has, have traffic rate and the capacity more much higher than the 3G communication technology, and the non-constant width of its frequency band that takies, its system need use ultra-wide band filter.The ultra broadband anti-collision radar system that uses in the automobile, the ultra broadband imaging system that is used for imaging, the ultra broadband rfid system that is used for storage and the covering of modern communications signal optimizing and direct discharging station etc. also need to use ultra-wide band filter.Ultra-wideband pulse radar system in the military electronic countermeasures also can be used ultra-wide band filter.Communication bureau of the United States Federal (FCC) has formally passed through in 2002 ultra broadband (UWB) technology is used for civilian proposal.After this, the research of ultra-wide band filter has attracted to study widely interest in academia.In fact, ultra-wide band filter exists multiple scheme.
Need place the UWB signal that a ultra-wide band filter can be launched system to meet the FCC standard at the front end of the radio frequency module of radio ultra wide band system, and reduce it as much as possible and be subjected to interference beyond the operating frequency.In addition, need to solve a large amount of ultra broadband matching problems in the radio ultra wide band system, for example the input and output of amplifier all need good matching network, to guarantee maximum transmission coefficient.Therefore, the ultra-wideband microwave filter is a crucial passive component in the UWB system, and its characteristic quality plays important effect for the overall performance of system.Because the UWB system uses very wide frequency band: so and a lot of other wireless communication system frequency range overlapping.The frequency range of UWB is 3.1-10.6GHZ, and U-NII (Unlicensed national information infrastructure) band limits has two parts, and 5.15GHz to 5.35GHz and 5.75 is to 5.85GHz.Though the transmitting power spectral density of radio ultra wide band system is very low in theory, should be able to and other system " undisturbedly coexistence ", radio ultra wide band system need be with experimental results show that to the compatibility of other system in the practical application.Particularly the working mechanism of radio ultra wide band system and characteristic also have a lot of unclear aspects, such as the outer interference problem of the band of radio ultra wide band system, be that ultra-wideband devices might produce certain interference to the wireless system outside its working frequency range, this part disturbs and also is difficult to accurately estimate with theoretical Calculation Method, as to the interference of GPS, to the interference of PCS Personal Communications System 900/1800MHzGSM, to interference of WLAN (wireless local area network) IEEE802.11 etc., particularly when there was a lot of ultra-wideband devices certain specific region, its concentrated interference must think better of.Therefore, from the relevant filter of hardware aspect design, to eliminate interference signal the interference of system is seemed particularly important.
Filter is quite important in ultra-wideband communication devices, and various filters have different functions and characteristic requirement.The necessary function of receiving terminal band pass filter is to avoid leaking and making receiver front end saturated owing to the transmitting terminal output signal, removes as the interference signal of image frequency one class and reduces Power leakage from the local oscillator of antenna end.The optimum performance of receiving terminal band pass filter comprises high decay (to remove interferences), reduce the band that directly influences receiving terminal sensitivity simultaneously and lead to Insertion Loss, so it must have precipitous attenuation outside a channel, good characteristics such as group delay.The basic function of transmitting terminal band pass filter is to reduce stray radiant power to avoid the interference to other wireless communication systems from transmitting terminal, and the main component of the signal that these are useless is two of emission signal frequency, triple-frequency harmonics and local oscillation.Another very important function be attenuate transmit in noise in the receive frequency section, suppress it to below the sensitivity of receiver.
2002 FCC (FCC) frequency range of 3.1-10.6GHz is free and open as after the application of the communications field, the ultra broadband short-distance wireless communication has caused the very big concern of global communication technical field.And filter is the passive device of indispensable and extensive utilization in the communication system, becomes one of focus of research especially.Because ultra-wide band filter requires to be operated in the so wideer band limits of 3.1-10.6GHz, and requires this filter that less size is arranged, traditional filter design method can't be designed wide band filter like this.
The method of realization ultra broadband has by low pass and high pass filter cascade or utilizes multimode resonator structure etc. at present.Structure such as various transmission line structures such as parallel coupled line, co-planar waveguide, microstrip line, strip line and form are come in the middle of all being applied to the design of ultra-wide band filter.But, along with radio communication product all develops towards light, thin, short, little direction, require filter size more and more littler.Therefore, how under the prerequisite of the performance that guarantees ultra-wide band filter, reducing filter size also is a major challenge of current ultra-wide band filter design.
In " Ultra-wideband bandpass filter using multiple-mode resonator " literary composition that people such as Zhu Lei deliver a kind of ultra-wide band filter based on the multimode resonator structure has been proposed in IEEE Microwave and Wireless Components Letter in 2005.Because simplicity of design, the filter characteristic of realization is better, thus this article quoted in a large number, yet the circuit size of this structure is bigger, and stopband attenuation is slow, band is outer to suppress relatively poor.People such as Zhu Lei deliver in IEEE Microwave and Wireless Components Letter in 2005 again then " Compact UWB bandpass filter using stub-loaded multiple-mode resonator " literary composition, as shown in Figure 2, multimode resonator structure based on the minor matters loading has been proposed, be used for the band external characteristic of the ultra-wide band filter of the above-mentioned multi-mode structure of improvement, and reduced circuit size.Though experimental result shows this structure and can reduce circuit size, suppresses outside band and not too big improvement of stop band attenuation.
The design that just is used in multiband filter before short circuit, open circuit minor matters load has very early suffered, and the minor matters loading structure also is one of main method of UWB filter design.Proposed a typical structure that loads minor matters in the document " Development of Packaged Ultra-Wideband Bandpass Filters ", its feature is exactly simple in structure, and the degree of freedom is big.This structure is the SIR structure of three moulds, and three modes of resonance all are independent controlled, so just makes things convenient for the scope of adjusting center resonance point and whole passband.We see that its passband is wideer also smooth, and just the insertion loss of stopband is big inadequately, and the parasitic passband that also has half-wavelength repeatability to bring.
The utility model content
The shortcoming that the purpose of this utility model is to overcome prior art provides a kind of ultra-wide band filter that loads resonator based on two minor matters with not enough.
In order to reach above-mentioned utility model purpose, the utility model by the following technical solutions:
A kind of ultra-wide band filter that loads resonator based on two minor matters of the utility model, comprise microstrip substrate, front portion, reverse side part and input output port, described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the metal ground plate of described filter; The input output port have two, be respectively first input output port and second input output port, described front portion comprises that the first uniform transmission line unit, the second uniform transmission line unit, the first parallel coupling feed, the second parallel coupling feed, two minor matters load resonator and dielectric-slab; The described first uniform transmission line unit, the second uniform transmission line unit lay respectively at positive two ends, the left and right sides and are on the same horizontal line, described first input output port link to each other with the first uniform transmission line unit, second import output port be connected with the second uniform transmission line unit; The first parallel coupling feed loads resonator with the second parallel coupling feed by two minor matters and is connected; The non-openend of the first parallel coupling feed is connected with the first uniform transmission line unit, and the non-openend of the second parallel coupling feed is connected with the second uniform transmission line unit, and dielectric-slab is connected with the grounded metal floor by the ground connection via hole.
Preferably, described pair of minor matters loading resonator is made of the multimode resonator of two open circuit minor matters and the multimode resonator of two short circuit minor matters.
Preferably, described two open circuit minor matters with respect to the electrical length of centre frequency 6.85GHz about 94.5 °, two short circuit minor matters are 42.5 ° with respect to the electrical length of centre frequency 6.85GHz.
Preferably, each section minor matters and transmission line impedance are identical.
Further, described impedance is 130.5 ohm.
Preferably, the via hole at described short circuit minor matters center is connected with metal ground plate by metal.
Preferably, described microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
Preferably, reverse side partly comprises unit, first defective ground, second defective unit, ground and grounded metal floor; Unit, first defective ground, unit, second defective ground all are that etching is removed corresponding planform on metal floor, thus the air element that forms; Unit, first defective ground is positioned at the first parallel coupling feed below, and unit, second defective ground is positioned at the second parallel coupling feed below; First the input output port, second the input output port also be connected with the grounded metal floor.
The utility model has following advantage and effect with respect to prior art:
1, utilize four patterns of two minor matters loaded type resonators to form unified broadband, can covering ultra wideband communications band 3.1-10.6GHz.Wherein two strange moulds and two even moulds can independently be controlled, and easily form unified passband.
2, by utilizing the loading of two pairs of minor matters (short circuit minor matters and open circuit minor matters), can respectively produce a transmission zero in the passband both sides, the rectangle degree is well improved.
3, two pairs of minor matters (short circuit minor matters and open circuit minor matters) all can produce transmission zero at last stopband, can improve the outer inhibition of band well.
4, two pairs of minor matters are crooked respectively, with the further miniaturization of UWB filter, size is little, and cost is low, and more compact structure is easier to other circuit integrated.
Description of drawings
Fig. 1 is the overall structural representation of the utility model ultra-wide band filter;
Fig. 2 is the front portion structural representation of the utility model ultra-wide band filter;
Fig. 3 is the reverse side part-structure schematic diagram of the utility model ultra-wide band filter;
Fig. 4 is Electromagnetic Simulation and the test curve with the frequency response of trap characteristic ultra-wide band filter.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, its by microstrip substrate, front portion, reverse side part and input output port form; Described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the metal ground plate of described filter; Input output port have two, be respectively input output port 1 and input output port 6.
As shown in Figure 2, described front portion comprises: the first uniform transmission line unit 2, the second uniform transmission line unit 5, the first parallel coupling feed 3, the second parallel coupling feed 4, two minor matters load resonator 7, dielectric-slab 8; The described first uniform transmission line unit 2, the second uniform transmission line unit 5 lay respectively at positive two ends, the left and right sides and are on the same horizontal line, described first input output port 1 link to each other with the first uniform transmission line unit 2, second import output port 6 be connected with the second uniform transmission line unit 5; The first parallel coupling feed 3 loads resonator 7 with the second parallel coupling feed 4 by two minor matters and is connected; The first parallel coupling feed 3 non-openends are connected with the first uniform transmission line unit 2, and the second parallel coupling feed 4 non-openends are connected with the second uniform transmission line unit 5; Two minor matters load resonator 7 by the multimode resonator formation of two open circuit minor matters (with respect to about 94.5 ° of the electrical length of centre frequency 6.85GHz), two short circuit minor matters (with respect to about 42.5 ° of the electrical length of centre frequency 6.85GHz); Each section minor matters and transmission line impedance are identical, are 130.5 ohm; The via hole at short circuit minor matters center is connected with metal ground plate by metal.The microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
As shown in Figure 3, described reverse side partly comprises: unit 9, first defective ground, unit 10, second defective ground, ground connection via hole 11 and grounded metal floor 12; Unit 9, first defective ground, unit 10, second defective ground all are that etching is removed corresponding planform on metal floor, thus the air element that forms; Unit 9, first defective ground is positioned at the first parallel coupling feed, 3 belows, and unit 10, second defective ground is positioned at the second parallel coupling feed, 4 belows; First the input output port 1, second the input output port 6 also be connected with grounded metal floor 12.
As shown in Figure 4, the frequency characteristic of present embodiment comprises: S21(inserts loss) parameter and S11(return loss) parameter, group delay.Abscissa represents frequency variable, and unit is GHz, and left side ordinate represents the amplitude variable, and unit is dB.Right side ordinate is group delay, and unit is ns.As can be seen from Figure 4, the three dB bandwidth of ultra-wide band filter of the present utility model is 2.9-10.8GHz, and the group delay of frequency is all less than 0.6ns, and last stopband inserts loss greater than 20dB in the 18GHz scope.In this example, two short circuit minor matters and two open circuit minor matters lay respectively at the both sides of one section transmission line.Two groups of minor matters can produce transmission zero in the frequency of needs, thereby suppress to go up the spurious mode of stopband, form wideer stopband characteristic.By changing the electrical length of two groups of minor matters, can control the pattern of ultra broadband, thereby adjust bandwidth, form the ultra broadband characteristic of 3.1-10.6GHz.
Above-described embodiment is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (8)
1. ultra-wide band filter that loads resonators based on two minor matters, comprise microstrip substrate, front portion, reverse side part and input output port, it is characterized in that, described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the grounded metal floor of described filter; The input output port have two, be respectively first input output port (1) and second input output port (6), described front portion comprises the first uniform transmission line unit (2), the second uniform transmission line unit (5), the first parallel coupling feed (3), the second parallel coupling feed (4), two minor matters loading resonator (7) and dielectric-slab (8); The described first uniform transmission line unit (2), the second uniform transmission line unit (5) lay respectively at positive two ends, the left and right sides and are on the same horizontal line, described first input output port (1) link to each other with the first uniform transmission line unit (2), second import output port (6) be connected with the second uniform transmission line unit (5); The first parallel coupling feed (3) loads resonator (7) with the second parallel coupling feed (4) by two minor matters and is connected; The non-openend of the first parallel coupling feed (3) is connected with the first uniform transmission line unit (2), the non-openend of the second parallel coupling feed (4) is connected with the second uniform transmission line unit (5), and dielectric-slab (8) is connected with the grounded metal floor by ground connection via hole (11).
2. the ultra-wide band filter based on two minor matters loading resonators according to claim 1 is characterized in that, described pair of minor matters load resonators (7) and are made of the multimode resonator of two open circuit minor matters and the multimode resonator of two short circuit minor matters.
3. the ultra-wide band filter that loads resonators based on two minor matters according to claim 2, it is characterized in that, described two open circuit minor matters are 94.5 ° with respect to the electrical length of centre frequency 6.85GHz, and two short circuit minor matters are 42.5 ° with respect to the electrical length of centre frequency 6.85GHz.
4. according to claim 2 or 3 described ultra-wide band filters based on two minor matters loading resonators, it is characterized in that each section minor matters and transmission line impedance are identical.
5. the ultra-wide band filter based on two minor matters loading resonators according to claim 4 is characterized in that described impedance is 130.5 ohm.
6. the ultra-wide band filter based on two minor matters loading resonators according to claim 4 is characterized in that the via hole at described short circuit minor matters center is connected with metal ground plate by metal.
7. the ultra-wide band filter based on two minor matters loading resonators according to claim 1 is characterized in that described microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
8. the ultra-wide band filter based on two minor matters loading resonators according to claim 1 is characterized in that, reverse side partly comprises unit (9), first defective ground, second defective unit (10), ground and grounded metal floor (12); Unit (9), first defective ground, second defective unit, ground (10) they all are to go up etching in grounded metal floor (12) to remove corresponding planform, thus the air element that forms; First defective unit, ground (9) is positioned at the first parallel coupling feed (3) below, and second defective unit, ground (10) is positioned at the second parallel coupling feed (4) below; First the input output port (1), second the input output port (6) also be connected with grounded metal floor (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220695720 CN203166046U (en) | 2012-12-15 | 2012-12-15 | Ultra wide band filter based on double-stub-loaded resonator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220695720 CN203166046U (en) | 2012-12-15 | 2012-12-15 | Ultra wide band filter based on double-stub-loaded resonator |
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| CN203166046U true CN203166046U (en) | 2013-08-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762478A (en) * | 2016-02-23 | 2016-07-13 | 电子科技大学 | Four-mode resonator loaded with high-impedance lines |
| CN105990632A (en) * | 2015-01-28 | 2016-10-05 | 青岛海尔电子有限公司 | Three-pass band filter |
| WO2018188292A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Broadband band-pass filter having broadband out-of-band suppression function |
| WO2018188294A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Double-stub matching open load- and coupling structure-based signal transmitting device |
| WO2018188293A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Signal transmitting device having broadband out-of-band rejection function |
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2012
- 2012-12-15 CN CN 201220695720 patent/CN203166046U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105990632A (en) * | 2015-01-28 | 2016-10-05 | 青岛海尔电子有限公司 | Three-pass band filter |
| CN105990632B (en) * | 2015-01-28 | 2019-03-08 | 青岛海尔电子有限公司 | A kind of three-passband filter |
| CN105762478A (en) * | 2016-02-23 | 2016-07-13 | 电子科技大学 | Four-mode resonator loaded with high-impedance lines |
| CN105762478B (en) * | 2016-02-23 | 2018-12-18 | 电子科技大学 | A kind of four mould resonators loading high resistant line |
| WO2018188292A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Broadband band-pass filter having broadband out-of-band suppression function |
| WO2018188294A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Double-stub matching open load- and coupling structure-based signal transmitting device |
| WO2018188293A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Signal transmitting device having broadband out-of-band rejection function |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130828 Effective date of abandoning: 20150603 |
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| RGAV | Abandon patent right to avoid regrant |