CN102544652A - Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect - Google Patents
Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect Download PDFInfo
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Abstract
The invention provides an ultra-wide-band filter with high selectivity and an ultrahigh attenuation band restrain effect, which is composed of a first input/output port, a second input/output port, an interlayer medium substrate, an upper layer micro-strip structure arranged on the interlayer medium substrate and an underlying metal floor board. The upper layer micro-strip structure comprises a first feed network, a multi branch knot loading multimode resonator and a second feed network. The multi branch knot loading multimode resonator of the upper layer micro-strip structure has five resonance modes in an ultra-wide-band frequency band scope, a transmission zero is generated above and below a passband respectively, and passband selectivity is greatly improved. In addition, generated zero and frequency doubling zero of the zero restrains high sequence resonance modes of the multimode resonator, and restraining effects of an upper attenuation band of the passband are greatly broadened. The ultra-wide-band filter has good passband character, high passband selectivity and ultra-high attenuation band restraining effect, and is applicable to ultra-wide-band wireless communication systems with high standard communication.
Description
Technical field
The present invention relates to the radio-frequency filter technical field in the radio communication, more particularly, relate to a kind of ultra-wide band filter with high selectivity and superelevation stopband inhibition effect.
Background technology
Along with developing rapidly of the communication technology, people not only are simple speech exchange to the requirement of radio communication, but pursue the wireless communication system of big data quantity such as HD video and high security.The research focus that ultra broadband (UWB) wireless communication technology is simple with its system configuration, characteristics such as cost is low, power consumption is little, transmission rate is high, good confidentiality become present wireless communication field.The The Technology of Ultra original form is the pulse of nanosecond or the subnanosecond level pulse wireless power technology as information carrier for directly utilizing pulsewidth, is mainly used in the wireless system of radar and low intercepting and capturing the/low investigation rate.Along with the development of microelectronic component technology, the UWB technology begins to be applied to civil area, has caused the upsurge to its research, development and application in the world, and is considered to the revolutionary technology of next generation wireless communication.In February, 2002, FCC (FCC) has ratified the application of UWB technology in the short-distance wireless communication field, opened 3.1GHz to this frequency range of 10.6GHz as commercialization.The UWB technology has broad application prospects, and for example various fields such as a high-speed radio territory net, wireless ether interface link, intelligent wireless local area network have a wide range of applications.As one of Primary Component in the UWB communication system, ultra-wide band filter obtains broad research.
The present major design method of ultra-wide band filter comprises: 1, based on short circuit minor matters loaded transmission line structure.This type of pass band width can load number control through the short circuit minor matters, and the ultra-wide band filter size that is designed is big, the passband poor selectivity, and it is poor that stopband suppresses, and Insertion Loss also increases with the minor matters number and increases.2, cascade high pass, low pass (band leads to, is with resistance) filter are realized ultra broadband.The same size of this type of ultra-wide band filter is bigger, is unfavorable for the miniaturized application of radio ultra wide band system.3, multimode resonator design ultra-wide band filter.Step electric impedance resonator in 2005 by first Application in the ultra-wide band filter design; Thereafter; Its passband selectivity, band are outer to be suppressed etc. in order to improve, and minor matters load multimode resonator, little band/co-planar waveguide multi-mode structure by being applied in the ultra-wide band filter design in succession.But, how to design have good pass-band performance, the ultra-wide band filter of high selectivity and high stopband suppression characteristic still is the research focus of present ultra-wide band filter design.
Certain methods has been mentioned in being implemented in of ultra-wide band filter in some patents; Like the patent No. is 201020585865.6 the ultra-wide band filter that loads based on step electric impedance resonator, and this patent is a kind of ultra-wide band filter that utilizes the step electric impedance resonator design.This step electric impedance resonator is a half-wave resonator centre position loading stepped impedance open circuit minor matters, can respectively produce a transmission zero at the upper and lower sides of ultra broadband passband through stepped impedance open circuit minor matters, has improved the selectivity of passband greatly.But this multimode resonator has only three modes of resonance in passband, and the transmission characteristic in the passband needs further to improve; It is also very narrow that the last stopband of the ultra-wide band filter that is designed suppresses bandwidth, and this also is to need to improve.
Summary of the invention
The objective of the invention is to overcome shortcoming of the prior art with not enough; A kind of ultra-wide band filter with high selectivity and superelevation stopband inhibition effect is provided; The present invention loads multimode resonator through adopting novel racemosus joint; The stopband that design has good pass-band performance, high passband selectivity and a superelevation suppresses the ultra-wide band filter of effect characteristic, and this ultra-wide band filter is particularly suitable for being applied in the ultra-wideband communication system in the short-distance wireless communication.
In order to achieve the above object; The present invention is achieved through following technical proposals: a kind of have a ultra-wide band filter that high selectivity and superelevation stopband suppress effect, it is characterized in that: be made up of first input/output end port, second input/output end port, intermediate layer medium substrate, the underlying metal floor that is arranged on the upper strata microstrip structure of intermediate layer medium substrate upper surface and is arranged on medium substrate bottom surface, intermediate layer; Said upper strata microstrip structure comprises that first feeding network, racemosus joint load the multimode resonator and second feeding network; Said first feeding network is made up of uniform transmission line three, uniform transmission line four and uniform transmission line five; One end of said uniform transmission line three links to each other with first input/output end port; The other end links to each other with uniform transmission line five with uniform transmission line four, and uniform transmission line four is parallel to uniform transmission line five; Second feeding network is made up of uniform transmission line six, uniform transmission line seven and uniform transmission line eight; One end of said uniform transmission line six links to each other with second input/output end port; The other end links to each other with uniform transmission line eight with uniform transmission line seven, and uniform transmission line seven is parallel to uniform transmission line eight; Said racemosus joint loads multimode resonator to be made up of uniform transmission line nine, uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, non uniform transmission line 14 and non uniform transmission line 15, and said non uniform transmission line 14 is arranged on the centre position of uniform transmission line nine with non uniform transmission line 15 and lays respectively at the both sides of uniform transmission line nine; Non uniform transmission line 14 forms by two sections not wide uniform transmission lines stack combinations successively with non uniform transmission line 15, and all is connected with uniform transmission line nine through one section narrower uniform transmission line; Said uniform transmission line ten, uniform transmission line 11, uniform transmission line 12 and uniform transmission line 13 are four sections identical uniform transmission lines and are carried in symmetrically on the uniform transmission line nine; Wherein uniform transmission line ten and uniform transmission line 11 are positioned at a side of non uniform transmission line 14 and non uniform transmission line 15, and uniform transmission line 12 and uniform transmission line 13 are positioned at the opposite side of non uniform transmission line 14 and non uniform transmission line 15; One end of said uniform transmission line nine inserts between the uniform transmission line four and uniform transmission line five of first feeding network, and the other end inserts between the uniform transmission line seven and uniform transmission line eight of second feeding network;
In the such scheme, non uniform transmission line 14 can respectively produce a transmission zero in the upper and lower both sides of ultra broadband passband, improves the passband selectivity of filter greatly; On the other hand; The frequency multiplication zero point at above-mentioned zero point and the transmission zero that produces by the non uniform transmission line that loads 15 and uniform transmission line ten or uniform transmission line 11 or uniform transmission line 12 or uniform transmission line 13; Be positioned at the last stopband of ultra broadband passband; These transmission zeros have been expanded bandwidth of rejection, and the stopband of having obtained superelevation suppresses effect.
More particularly, said first input/output end port and second input/output end port are on the same horizontal line, and about medial axis symmetry, and said medial axis is positioned at uniform transmission line nine intermediate point positions and perpendicular to uniform transmission line nine.
It is five mould resonators that described racemosus joint loads multimode resonator.This resonator (3.1GHz-10.6GHz) in the ultra broadband frequency range has five modes of resonance, has guaranteed that the ultra-wide band filter that is designed has good pass-band performance.
Said underlying metal floor comprises unit 16, first defective ground, second defective unit 17, ground and metal unit 18; Said first defective unit, ground and unit, second defective ground are the air element that etching forms on metal unit.
Unit, said first defective ground be arranged on by uniform transmission line four, uniform transmission line five and uniform transmission line nine form parallel three-way under; Unit, said second defective ground be arranged on by uniform transmission line seven, uniform transmission line eight and uniform transmission line nine form parallel three-way under.
Compared with prior art, the present invention has following advantage and beneficial effect:
1, the present invention adopts the racemosus joint to load multimode resonator, in the ultra broadband frequency range, has five modes of resonance, makes its pass-band performance better.
2, the centre of racemosus joint loading multimode resonator of the present invention is that asymmetrical stepped impedance minor matters load, and one of them stepped impedance minor matters can respectively produce a transmission zero in the upper and lower side of passband, has improved the selection performance of passband greatly.
3, the present invention is positioned at stopband on the passband by transmission zero and the frequency multiplication thereof that each loads the minor matters generation zero point, and these transmission zeros have suppressed the higher modes of multimode resonator, and the stopband that has obtained superelevation suppresses effect.
4, the ultra-wide band filter among the present invention adopts the planar circuit structure, be suitable for radio ultra wide band system in other devices integrated, in addition, the circuit overall dimensions is little, compact conformation, space availability ratio is high.
Description of drawings
Fig. 1 is the structural representation of ultra-wide band filter of the present invention;
Fig. 2 is the upper strata microstrip structure sketch map of ultra-wide band filter of the present invention;
Fig. 3 is the underlying metal ground structure sketch map of ultra-wide band filter of the present invention;
Fig. 4 is the frequency response curve sketch map of ultra-wide band filter of the present invention at frequency range 0-16GHz;
Fig. 5 is the frequency response curve sketch map of ultra-wide band filter of the present invention at frequency range 0-39GHz.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
Embodiment
The structural representation of ultra-wide band filter of the present invention is as shown in Figure 1; This ultra-wide band filter has good pass-band performance, high passband selectivity and the stopband of superelevation and suppresses effect; This ultra-wide band filter is made up of first input/output end port 1, second input/output end port 2, upper strata microstrip structure, intermediate layer medium substrate and underlying metal floor, its at the middle and upper levels microstrip structure and underlying metal floor respectively attached to medium substrate above and below, intermediate layer.
As shown in Figure 2, the upper strata microstrip structure comprises that first feeding network, racemosus joint load multimode resonator, second feeding network.Wherein first feeding network is made up of uniform transmission line 33, uniform transmission line 44 and uniform transmission line 55; Wherein an end of uniform transmission line 33 links to each other with first input/output end port 1, and its other end links to each other with uniform transmission line 55 with uniform transmission line 44 respectively.Second feeding network is made up of uniform transmission line 66, uniform transmission line 77 and uniform transmission line 88, and wherein an end of uniform transmission line 66 links to each other with second input/output end port 2, and its other end links to each other with uniform transmission line 88 with uniform transmission line 77 respectively.The racemosus joint loads multimode resonator and is made up of uniform transmission line 99, uniform transmission line 10, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, non uniform transmission line 14 and non uniform transmission line 15; Wherein non uniform transmission line 14 and non uniform transmission line 15 are in the centre position of uniform transmission line 99; And combine by two sections not wide uniform transmission lines respectively; All be connected with uniform transmission line 99, and lay respectively at the both sides up and down of uniform transmission line 99 through one section narrower uniform transmission line; Uniform transmission line 10, uniform transmission line 11, uniform transmission line 12 and uniform transmission line 13 are four sections identical uniform transmission lines and are carried in symmetrically on the uniform transmission line 99; Wherein, Uniform transmission line 10 and uniform transmission line 11 are positioned at a side of non uniform transmission line 14 and non uniform transmission line 15, and uniform transmission line 12 and uniform transmission line 13 are positioned at the opposite side of non uniform transmission line 14 and non uniform transmission line 15.First input/output end port 1 and second input/output end port 2 are on the same horizontal line, and symmetrical about the medial axis of intermediate layer medium substrate, and medial axis is perpendicular to uniform transmission line 99.First feeding network and second feeding network are about the medial axis symmetry of intermediate layer medium substrate, and medial axis is perpendicular to uniform transmission line 99.One end of uniform transmission line 99 inserts between the uniform transmission line 44 and uniform transmission line 55 of first feeding network, and the other end inserts between the uniform transmission line 77 and uniform transmission line 88 of second feeding network.
The underlying metal ground structure sketch map of ultra-wide band filter of the present invention is as shown in Figure 3, and the underlying metal floor comprises unit 16, first defective ground, second defective unit 17, ground and metal unit 18; Wherein, unit 16, first defective ground, unit 17, second defective ground all are that etching is removed the corresponding structure shape on metal unit 18, form air element.As shown in Figure 1, unit 16, first defective ground be positioned at by uniform transmission line 44, uniform transmission line 55 and uniform transmission line 99 form parallel three-way under; Unit 17, second defective ground be positioned at by uniform transmission line 77, uniform transmission line 88 and uniform transmission line 99 form parallel three-way under.
In the present embodiment, the dielectric constant of middle level medium substrate is 2.55, and thickness is 0.8mm.In this ultra-wide band filter, the live width of uniform transmission line 99 is made as 0.5mm, and length is half guide wavelength under the mode frequency 4.61GHz, i.e. 22.2mm.Uniform transmission line 10, uniform transmission line 11, uniform transmission line 12 and the uniform transmission line 13 of racemosus joint loading multimode resonator can be controlled the mode profile of this multimode resonator, and its live width all is made as 1.0mm, and length all is made as 2.65mm.Non uniform transmission line 14 can respectively produce a transmission zero at passband upside and downside; Improved the selection performance of ultra broadband passband greatly, and its frequency multiplication is positioned at stopband on the passband zero point, also expanded the bandwidth of rejection of this ultra-wide band filter; The low-resistance line live width of non uniform transmission line 14 is 1.1mm; Line length is 8.9mm, and its high resistant line part live width is 4.78mm, and live width is 4.23mm.The non uniform transmission line 15 that is positioned at the downside of uniform transmission line 99 can produce transmission zero by stopband on passband, improve stopband and suppress effect, and its low-resistance line live width is 0.28mm, and line length is 0.33mm, and high resistant line part live width is 1.4mm, and line length is 1.8mm.
The frequency response characteristic of filter comprises that transmission characteristic is promptly | S21| amplitude response, reflection characteristic promptly | the S11| amplitude response in addition, also requires to have smooth delay character in the passband for ultra-wide band filter.Fig. 4 ultra-wide band filter of the present invention is at the frequency response curve sketch map of frequency range 0-16GHz; Its 3-dB bandwidth has comprised the frequency range from 3.1GHz to 11.1GHz; Have the ultra broadband bandpass characteristics, wherein the Insertion Loss of 3.1GHz in the 10.6GHz frequency band is less than 1.0dB.Respectively there is a transmission zero at upside 2.8GHz and downside 11.5GHz place at passband, have good passband selectivity.
Fig. 5 is the frequency response curve sketch map of ultra-wide band filter of the present invention at frequency range 0-39GHz.This filter-the 20dB bandwidth of rejection is extended to 29.7GHz, and have very high stopband and suppress effect.Simultaneously, the passband delay character of this filter is good.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. one kind has the ultra-wide band filter that high selectivity and superelevation stopband suppress effect, it is characterized in that: be made up of first input/output end port, second input/output end port, intermediate layer medium substrate, the underlying metal floor that is arranged on the upper strata microstrip structure of intermediate layer medium substrate upper surface and is arranged on medium substrate bottom surface, intermediate layer; Said upper strata microstrip structure comprises that first feeding network, racemosus joint load the multimode resonator and second feeding network; Said first feeding network is made up of uniform transmission line three, uniform transmission line four and uniform transmission line five; One end of said uniform transmission line three links to each other with first input/output end port; The other end links to each other with uniform transmission line five with uniform transmission line four, and uniform transmission line four is parallel to uniform transmission line five; Second feeding network is made up of uniform transmission line six, uniform transmission line seven and uniform transmission line eight; One end of said uniform transmission line six links to each other with second input/output end port; The other end links to each other with uniform transmission line eight with uniform transmission line seven, and uniform transmission line seven is parallel to uniform transmission line eight; Said racemosus joint loads multimode resonator to be made up of uniform transmission line nine, uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, non uniform transmission line 14 and non uniform transmission line 15, and said non uniform transmission line 14 is arranged on the centre position of uniform transmission line nine with non uniform transmission line 15 and lays respectively at the both sides of uniform transmission line nine; Non uniform transmission line 14 forms by two sections not wide uniform transmission lines stack combinations successively with non uniform transmission line 15, and all is connected with uniform transmission line nine through one section narrower uniform transmission line; Said uniform transmission line ten, uniform transmission line 11, uniform transmission line 12 and uniform transmission line 13 are four sections identical uniform transmission lines and are carried in symmetrically on the uniform transmission line nine; Wherein uniform transmission line ten and uniform transmission line 11 are positioned at a side of non uniform transmission line 14 and non uniform transmission line 15, and uniform transmission line 12 and uniform transmission line 13 are positioned at the opposite side of non uniform transmission line 14 and non uniform transmission line 15; One end of said uniform transmission line nine inserts between the uniform transmission line four and uniform transmission line five of first feeding network, and the other end inserts between the uniform transmission line seven and uniform transmission line eight of second feeding network.
2. the ultra-wide band filter with high selectivity and superelevation stopband inhibition effect according to claim 1; It is characterized in that: said first input/output end port and second input/output end port are on the same horizontal line; And about medial axis symmetry, said medial axis is positioned at uniform transmission line nine intermediate point positions and perpendicular to uniform transmission line nine.
3. the ultra-wide band filter with high selectivity and superelevation stopband inhibition effect according to claim 1, it is characterized in that: it is five mould resonators that described racemosus joint loads multimode resonator.
4. the ultra-wide band filter with high selectivity and superelevation stopband inhibition effect according to claim 1, it is characterized in that: said underlying metal floor comprises unit, first defective ground, second defective unit, ground and metal unit; Said first defective unit, ground and unit, second defective ground are the air element that etching forms on metal unit.
5. according to claim 4 have a ultra-wide band filter that high selectivity and superelevation stopband suppress effect, it is characterized in that: unit, said first defective ground be arranged on by uniform transmission line four, uniform transmission line five and uniform transmission line nine form parallel three-way under; Unit, said second defective ground be arranged on by uniform transmission line seven, uniform transmission line eight and uniform transmission line nine form parallel three-way under.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035986A (en) * | 2012-12-15 | 2013-04-10 | 华南理工大学 | Ultra wide-band filter based on double minor matters loading harmonic oscillator |
| CN103151582A (en) * | 2013-02-27 | 2013-06-12 | 西安电子工程研究所 | Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band |
| CN104051830A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Multimode broadband band-pass filter |
| CN104577268A (en) * | 2015-01-04 | 2015-04-29 | 华南理工大学 | Planar lowpass-bandpass triplexer |
| CN105070990A (en) * | 2015-08-13 | 2015-11-18 | 电子科技大学 | Micro-strip ultra wide band band-pass filter based on novel multimode resonator which is shaped like a Chinese character wang |
| CN107146932A (en) * | 2017-06-27 | 2017-09-08 | 南京理工大学 | Ultra wide band bandpass filter based on parallel coupled line |
| CN107395224A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with three minor matters coupling microstrip cable architectures of loading |
| CN107394321A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
| CN107395223A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with the coupling of three minor matters and double minor matters matching microstrip line construction |
| WO2018233230A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter with widened relative bandwidth |
| CN113611992A (en) * | 2021-05-07 | 2021-11-05 | 电子科技大学 | High-frequency reconfigurable microstrip band-pass filter |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035986A (en) * | 2012-12-15 | 2013-04-10 | 华南理工大学 | Ultra wide-band filter based on double minor matters loading harmonic oscillator |
| CN103035986B (en) * | 2012-12-15 | 2015-06-03 | 华南理工大学 | Ultra wide-band filter based on double minor matters loading harmonic oscillator |
| CN103151582A (en) * | 2013-02-27 | 2013-06-12 | 西安电子工程研究所 | Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band |
| CN104051830A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Multimode broadband band-pass filter |
| CN104577268A (en) * | 2015-01-04 | 2015-04-29 | 华南理工大学 | Planar lowpass-bandpass triplexer |
| CN104577268B (en) * | 2015-01-04 | 2017-06-06 | 华南理工大学 | Plane low pass band logical triplexer |
| CN105070990A (en) * | 2015-08-13 | 2015-11-18 | 电子科技大学 | Micro-strip ultra wide band band-pass filter based on novel multimode resonator which is shaped like a Chinese character wang |
| CN105070990B (en) * | 2015-08-13 | 2018-03-09 | 电子科技大学 | A kind of micro band superwide band bandpass filter based on new king's font multimode resonator |
| CN107395224A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with three minor matters coupling microstrip cable architectures of loading |
| CN107394321A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
| CN107395223A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with the coupling of three minor matters and double minor matters matching microstrip line construction |
| WO2018233230A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter with widened relative bandwidth |
| WO2018233227A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter loaded with three-branch coupled micro-strip line |
| CN107146932A (en) * | 2017-06-27 | 2017-09-08 | 南京理工大学 | Ultra wide band bandpass filter based on parallel coupled line |
| CN107146932B (en) * | 2017-06-27 | 2019-06-21 | 南京理工大学 | Ultra wide band bandpass filter based on parallel coupled line |
| CN113611992A (en) * | 2021-05-07 | 2021-11-05 | 电子科技大学 | High-frequency reconfigurable microstrip band-pass filter |
| CN113611992B (en) * | 2021-05-07 | 2022-07-15 | 电子科技大学 | High-frequency reconfigurable microstrip band-pass filter |
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