CN201503900U - Source-end coupling microstrip filter - Google Patents
Source-end coupling microstrip filter Download PDFInfo
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- CN201503900U CN201503900U CN2009201950646U CN200920195064U CN201503900U CN 201503900 U CN201503900 U CN 201503900U CN 2009201950646 U CN2009201950646 U CN 2009201950646U CN 200920195064 U CN200920195064 U CN 200920195064U CN 201503900 U CN201503900 U CN 201503900U
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Abstract
The utility model discloses a source-end coupling microstrip filter which comprises a T-shaped resonator, an input coupling feeder, an output coupling feeder and an interdigital coupled line, wherein the T-shaped resonator has two open-circuit branch knots and one short-circuit branch knot; the two open-circuit branch knots form two sides of a U-shaped microstrip line; the short-circuit branch knot is arranged at the bottom end of the U-shaped microstrip line; the short-circuit end of the short-circuit branch knot is provided with a grounded through hole; the sum of the length of the open-circuit branch knots and the short-circuit branch knot is half of the wavelength; the input coupling feeder and the output coupling feeder are coupled with the two open-circuit branch knots at the internal sides of the open-circuit branch knots of the T-shaped resonator; and the interdigital coupled line is arranged in the T-shaped resonator and between the input coupling feeder and the output coupling feeder. The source-end coupling microstrip filter has the advantages of having a plurality of controllable transmission zero points, flexible design, small volume, small insertion loss and the like.
Description
Technical field
The utility model relates to microwave microstrip filter field, the source end coupling microstrip filter that relates in particular to a kind of multimode resonator and have source end coupled structure.
Background technology
As the headend equipment of wireless communication system, the availability of frequency spectrum is urgent to the radio-frequency filter demand with high selectivity, small size, low cost, flexible design efficiently.High selectivity is meant that the passband of filter response is very rapid to the stopband transition, and promptly transition band is very precipitous, and the stopband Insertion Loss will be tried one's best greatly.The transmission zero of passband both sides and stopband will be improved the selectivity of filter greatly.Transmission zero is exactly the trap point, can think the zero point on the frequency response curve.Transmission zero can appear at the one or both sides of passband, and band is outer to be suppressed and generation symmetry or asymmetrical filter response to improve.Utilize transmission zero can make lower order filter obtain characteristic preferably.Simultaneously, the design cycle has been shortened in the flexibility that the independent design that bandwidth and filter selectivity are carried out has improved Design of Filter.
Filter realize the principle of transmission zero be electromagnetic signal from the input to the output through different paths, identical in the amplitude of a certain frequency signal, phase place is opposite, thus cancel out each other the generation transmission zero.Based on this principle, existing microstrip filter realizes that the technology of transmission zero has: the microstrip filter, cross-couplings microstrip filter and the source end coupling microstrip filter that load minor matters on resonator.On resonator, load signal that minor matters make that the signal that transmits from port returns with the minor matters end reflection with anti-phase, thereby make filter produce zero point.The cross-couplings technology is meant that electromagnetic signal not only passed through main coupling path from the input of filter to output, has also passed through the cross-couplings path.Main coupling is meant that input is to the coupling successively in order of the resonant element between the output in the filter; Cross-couplings is meant the coupled relation that has between the non-adjacent resonant element.Main coupling path and cross-couplings path make filter produce transmission zero.As at disclosed Chinese invention patent application CN1414658A on April 30th, 2003, just disclosed a kind of filter that adopts the cross-couplings technology, the main coupling of this filter is to be coupled by the slit between the adjacent resonators, and inferior coupling is by a microstrip line two resonators to be coupled between the non-adjacent resonators.And source end coupling microstrip filter is to make electromagnetic signal be not only from the input port to the output port by resonator to transmit, and also exists a more direct transmission path: be coupled to output port from input port.Signal transmits by many comparatively direct paths, thereby makes filter realize a plurality of transmission zeros.
Under existing technical conditions, the size that loads filters such as minor matters and cross-couplings is bigger, and the multipath of signal transmission is not easy control, and the transmission zero number is limited, and transmission zero and bandwidth etc. can not separately be controlled.And the higher order filter that traditional flat type filter and Chebyshev filter form by a plurality of resonator cascades also can make filter response have comparatively precipitous transition band, but this filter exists that volume is big, deficiencies such as Insertion Loss is also bigger in the band.
The utility model content
The purpose of this utility model is can't realize selectivity preferably in order to solve existing microstrip filter, and volume is still bigger, design inflexible technical problem, a kind of novel source end coupling microstrip filter is provided, the utlity model has a plurality of controllable transmission zero points, two different source end coupling networks make not only filter when realizing a plurality of controllable transmission zero points but also can design the filter that is applied to different communication systems, its flexible design, volume is little, the insertion loss is little, cost is low, characteristic is good, can satisfy the demand of various radio communications, be the splendid selection that substitutes existing microstrip bandpass filter product.
The purpose of this utility model can be achieved through the following technical solutions: source end coupling microstrip filter comprises a T shape resonator, input coupling feed, output coupling feed, one group of interdigital coupling line; Wherein T shape resonator has two open circuit minor matters and short circuit minor matters, two open circuit minor matters constitute the both sides of U-shaped microstrip line, the short circuit minor matters are arranged on the bottom of described U-shaped microstrip line, the short-circuit end of short circuit minor matters is provided with grounding through hole, and the length sum of two open a way minor matters and short circuit minor matters is 1/2nd wavelength; Input coupling feed, output coupling feed are coupled with the open circuit minor matters in the inboard of the open circuit minor matters of T shape resonator; Interdigital coupling line is positioned at T shape resonator, and is arranged between input coupling feed and the output coupling feed.
Described interdigital coupling line with the input coupling feed, output coupling feed vertical.
Described interdigital coupling line is provided with at least 2.
Described interdigital coupling line is for the interdigital coupling line of open circuit or be the interdigital coupling line of short circuit; When described interdigital coupling line was the interdigital coupling line of short circuit, the short-circuit end of interdigital coupling line was provided with grounding through hole.
The purpose of this utility model can also be achieved through the following technical solutions: source end coupling microstrip filter comprises at least two T shape resonator, input coupling feed, output coupling feed, interdigital coupling lines of at least two groups that embed the coupling cascade; Wherein each T shape resonator all has two open circuit minor matters and short circuit minor matters, two open circuit minor matters constitute the both sides of U-shaped microstrip line, the short circuit minor matters are arranged on the bottom of described U-shaped microstrip line, the short-circuit end of short circuit minor matters is provided with grounding through hole, and the length sum of two open a way minor matters and short circuit minor matters is 1/2nd wavelength; Input coupling feed, output coupling feed are coupled at the inboard of the open circuit minor matters of first T shape resonator, last T shape resonator and with corresponding open circuit minor matters respectively; Every group of interdigital coupling line all is positioned at T shape resonator, and be arranged on input coupling feed or output coupling feed and and this T shape resonator embed between the open circuit minor matters of T shape resonator of coupling cascade, or be arranged on and this T shape resonator embeds between the open circuit minor matters of two T shape resonators of coupling cascade.
Preferably, above-mentioned source end coupling microstrip filter comprises a T shape resonator and the 2nd T shape resonator that embeds the coupling cascade, and first group of interdigital coupling line, second group of interdigital coupling line; First group of interdigital coupling line is positioned at a T shape resonator, and is arranged between the open circuit minor matters of input coupling feed and the 2nd T shape resonator; Second group of interdigital coupling line is positioned at the 2nd T shape resonator, and is arranged between the open circuit minor matters of an output coupling feed and a T shape resonator.
Preferably, above-mentioned source end coupling microstrip filter comprises a T shape resonator, the 2nd T shape resonator, the 3rd T shape resonator that embeds the coupling cascade, and first group of interdigital coupling line, second group of interdigital coupling line, the 3rd group of interdigital coupling line; First group of interdigital coupling line is positioned at a T shape resonator, and is arranged between the open circuit minor matters of input coupling feed and the 2nd T shape resonator; Second group of interdigital coupling line is positioned at the 2nd T shape resonator, and is arranged between the open circuit minor matters of the open circuit minor matters of a T shape resonator and the 3rd T shape resonator; The 3rd group of interdigital coupling line is positioned at the 3rd T shape resonator, and is arranged between the open circuit minor matters of output coupling feed and the 2nd T shape resonator.
Compared with prior art, the utlity model has following advantage:
1. though the traditional flat type filter of high-order that a plurality of resonant element cascades form and Chebyshev filter transition band utilized is comparatively precipitous, its size is bigger, the design process complexity, and the band internal characteristic is also very undesirable.And filter described in the utility model can only be a second order filter, but makes frequency response curve produce four transmission zeros, allows the selectivity of filter become very desirable, and Insertion Loss is very little in the band; Be that the utility model has only used the elliptic function filter of second order just to realize being equal to or being better than the transmission performance that realizes with flat type filter of high-order and Chebyshev filter, reduced the number of required resonant element, thereby reduced the volume of filter, reduced production cost, also made signal simultaneously very little by loss in the filter.
2. load filter, cross-couplings filter etc. with existing minor matters and have the filter at additional transmissions zero point and compare, the utlity model has lower exponent number, littler volume, more transmission zero and design flexible more.Minor matters load filter, and same of minor matters reflected signal and input signal are anti-phase to have produced extra transmission zero by making, but this filter can only produce an extra transmission zero.The cross-couplings filter has produced extra transmission zero by main coupling with two different paths of cross-couplings, but the cross-couplings filter of a second order also can only produce an extra transmission zero.An extra limited transmission zero can not make the selectivity characteristic of filtering become very desirable.And in the utility model, filter is by the coupling between port coupling and port and the resonator, for two more direct parallel transmission paths have been created in the transmission of signal, make the frequency response of filter produce maximum 4 extra transmission zeros, and the source end coupling that can freely control stiffness of coupling makes the number of transmission zero and position to control again, thereby has created condition for producing different transmission zero situations; And when changing the transmission zero situation, all without any influence, make Design of Filter flexible to centre frequency and bandwidth.Above-mentioned advantage makes the utility model can satisfy the needs of different filter designer.
In addition, filter construction described in the utility model also can constitute any 2n rank filter by the cascade of a plurality of T shape resonator, suppresses outward thereby obtain more desirable band.
3. adopt port coupling microstrip filter structure of the present utility model can also design the more desirable higher order filter of the outer inhibition of band, also can design microstrip bandpass filter with inhibition parasitic passband and second harmonic.
4. the utility model can combine with existing other multimode resonator, and it is littler to create volume, the multi-zero port coupling filter that performance is more superior.
Description of drawings
Fig. 1 is the open a way second order source end coupling microstrip filter structure of interdigital coupling line of the utility model band.
Fig. 2 is the second order source end coupling microstrip filter structure of the interdigital coupling line of the utility model band short circuit.
Fig. 3 is a quadravalence source end coupling microstrip filter structure of the present utility model.
Fig. 4 is six rank source end coupling microstrip filter structures of the present utility model.
Fig. 5 is the different transmission path schematic diagram of signal from the input port to the output port in the utility model.
Fig. 6 has the Electromagnetic Simulation frequency response curve of three additional transmissions during zero point when as shown in Figure 1 second order filter in the utility model.
Fig. 7 has the Electromagnetic Simulation frequency response curve of four additional transmissions during zero point when as shown in Figure 1 second order filter in the utility model.
Fig. 8 is as shown in Figure 2 the Electromagnetic Simulation frequency response curve of second order filter in the utility model.
Fig. 9 is as shown in Figure 3 the Electromagnetic Simulation frequency response curve of four-step filter in the utility model.
Figure 10 is as shown in Figure 4 the Electromagnetic Simulation frequency response curve of six rank filters in the utility model.
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.
As shown in Figure 1, present embodiment is the second order source end coupling microstrip filter with a plurality of controllable transmission zero points, comprise a T shape resonator 11 that is centrosymmetric, input coupling feed 17, output coupling feed 10, and in T shape resonator, be arranged on input coupling feed and output between the coupling feed and with input coupling feed, one group of vertical interdigital coupling line 15 of output coupling feed.T shape resonator 11 comprises two open circuit minor matters 12, short circuit minor matters 13, and wherein two open circuit minor matters 12 constitute the both sides of U-shaped microstrip lines; Short circuit minor matters 13 are arranged on the bottom of described U-shaped microstrip line, and the short-circuit end of short circuit minor matters 13 is provided with grounding through hole 14, and microstrip line is by the formation short circuit that links to each other with ground of this grounding through hole 14.The input port 18 of source end coupling microstrip filter, output port 19 are drawn from input coupling feed 17, output coupling feed 10 respectively.
The length sum of two open a way minor matters 12 and short circuit minor matters 13 is 1/2nd wavelength (total length that is T shape resonator 11 is 1/2nd wavelength), and the length of the minor matters of wherein opening a way 12 is far longer than the length of short circuit minor matters 13; In addition, the characteristic impedance of open circuit minor matters 12 and short circuit minor matters 13 can be the same or different, promptly the width of minor matters can difference also can be identical.This T shape resonator is a dual-mode resonator, so can form a second order filter, compares with the existing second order filter that is made of the resonator of two 1/2nd wavelength, has reduced size.
The both sides of two open circuit minor matters 12 formation U-shaped microstrip lines make filter construction compact more, have also created condition in order to introduce coupling between port simultaneously.The coupling feed structure is adopted in the input and output of filter, between the open circuit minor matters 12 of the input coupling feed 17 of filter, output coupling feed 10 and T shape resonator 11 certain distance is arranged all, is coupled in the inboard of open circuit minor matters and the minor matters of opening a way.In the present embodiment, one group of interdigital coupling line 15 between input coupling feed 17, output coupling feed 10 is provided with 2 interdigital coupling lines, and input port and output port directly are coupled by interdigital coupling line 15; In the present embodiment, interdigital coupling line is for the interdigital coupling line of open circuit, shown in the Reference numeral among Fig. 1 16.In addition, the width of interdigital coupling line and interdigital coupling line distance each other can be regulated according to different needs situations at zero point, and interdigital coupling line also can be according to needs situation and easy on and off is regulated at zero point in the position of input coupling feed, output coupling feed.
The path of signal from the input port to the output port can be T shape resonator 11, also can be directly by interdigital coupling line 15.Such mulitpath makes has had a plurality of transmission zeros in the transmission characteristic of filter.The length of interdigital coupling line 15, live width, distance between centers of tracks can change the stiffness of coupling between the port, thereby the number and the position of transmission zero exerted an influence.
As shown in Figure 2, present embodiment also is the second order source end coupling microstrip filter with a plurality of controllable transmission zero points, structurally similar to Example 1: as to comprise the T shape resonator 21 that is centrosymmetric, input coupling feed 27, output coupling feed 20, and in T shape resonator, be arranged on input coupling feed 27, the one group interdigital coupling line 25 of output between the coupling feed 20.T shape resonator 21 comprises that two open circuit minor matters 22 and 23, two open circuits of short circuit minor matters minor matters 22 constitute the both sides of U-shaped microstrip line; Short circuit minor matters 23 are arranged on the bottom of described U-shaped microstrip line, and the short-circuit end of short circuit minor matters 23 is provided with grounding through hole 24, and described U-shaped microstrip line is by the formation short circuit that links to each other with ground of this grounding through hole 24.As different from Example 1: one group of set interdigital coupling line 25 is the interdigital coupling lines of short circuit between input coupling feed 27, the output coupling feed 20.The short-circuit end of the interdigital coupling line of present embodiment is provided with the short circuit through hole, and shown in the Reference numeral among Fig. 2 26, microstrip line is connected with the floor by this short circuit through hole.
The transmission path of signal is also identical with embodiment 1, and 29 path is T shape resonator 21 or directly passes through interdigital coupling line 25 from input port 28 to output port.The length of interdigital coupling line 25, live width, distance between centers of tracks can change the stiffness of coupling between the port, thereby the number and the position of transmission zero exerted an influence.
As shown in Figure 3, present embodiment is the quadravalence source end coupling microstrip filter, comprise the T shape resonator 31 and the 2nd T shape resonator 32 that embed the coupling cascade, and first group of interdigital coupling line 33, second group of interdigital coupling line 34, input coupling feed 35, export coupling feed 36.First group of interdigital coupling line 33 is provided with 2 interdigital coupling lines, is positioned at a T shape resonator 31, and is arranged between the open circuit minor matters of input coupling feed 35 and the 2nd T shape resonator 32; Second group of interdigital coupling line 34 is provided with 2 interdigital coupling lines, is positioned at the 2nd T shape resonator 32, and is arranged between the open circuit minor matters of an output coupling feed 36 and a T shape resonator 31.Wherein a T shape resonator 31 is by the second interdigital coupling line 34 and 36 couplings of output coupling feed, and the 2nd T shape resonator 32 is by the first interdigital coupling line 33 and 35 couplings of input coupling feed; Input port 37 is drawn from input coupling feed 35, and output port 38 is drawn from output coupling feed 36.
In the present embodiment, the structure of two T shape resonators is identical with embodiment 1 all; First, second organizes interdigital coupling line also is to be the interdigital coupling line of interdigital coupling line or short circuit of opening a way.
As shown in Figure 4, present embodiment is six rank source end coupling microstrip filters, comprise the T shape resonator 41, the 2nd T shape resonator 42, the 3rd T shape resonator 43 that embed the coupling cascade, and the interdigital coupling line of first group of interdigital coupling line 44, second group 45, the 3rd group of interdigital coupling line 46, incoming feeder 47 and output feeder 48.First group of interdigital coupling line 44 is positioned at a T shape resonator 41, and is arranged between the open circuit minor matters of input coupling feed 47 and the 2nd T shape resonator 42; Second group of interdigital coupling line 45 is positioned at the 2nd T shape resonator 42, and is arranged between the open circuit minor matters of the open circuit minor matters of a T shape resonator 41 and the 3rd T shape resonator 43; The 3rd group of interdigital coupling line 46 is positioned at the 3rd T shape resonator 43, and is arranged between the open circuit minor matters of output coupling feed 48 and the 2nd T shape resonator 42.Be coupled by the second interdigital coupling line 45 between the one T shape resonator 41 and the 3rd T shape resonator 43, the 2nd T shape resonator 42 is by the 3rd interdigital coupling line 46 and 48 couplings of output coupling feed, and the 2nd T shape resonator 42 is by the first interdigital coupling line 44 and 47 couplings of input coupling feed; Input port 49 is drawn from input coupling feed 47, and output port 40 is drawn from output coupling feed 48.
In the present embodiment, the structure of two T shape resonators is identical with embodiment 1 all; First, second organizes interdigital coupling line also is to be the interdigital coupling line of interdigital coupling line or short circuit of opening a way.
The utility model source end coupling microstrip filter can utilize the little band of traditional common metal to realize, also can realize with high temperature superconducting materia.By embodiment 1-4 as can be known, with the cascade that is coupled successively of n T shape resonator described in the utility model, just can constitute any 2n rank source end coupling microstrip filter.
The centre frequency of the utility model filter and the principle of bandwidth Design are: the total length of the T shape resonator 11,21 as shown in Fig. 1 and Fig. 2 is 1/2nd wavelength.These T shape resonator 11,21 even mould resonance frequencys are determined jointly by the length of open circuit minor matters 12,22 and short circuit minor matters 13,23; And strange mould resonance frequency is only relevant with the length of open circuit minor matters 12,22, and is irrelevant with the length of short circuit minor matters 13,23; That is to say that the length of open circuit minor matters and short circuit minor matters is used to determine the even mould resonance frequency of T shape resonator, the length of open circuit minor matters is used to determine the strange mould resonance frequency of T shape resonator.Therefore, only just can change the even mould resonance frequency of T shape resonator 11,21, and strange mould resonance frequency does not change, can change the bandwidth of filter thus easily by the length that changes short circuit minor matters 13,23.
In described filter, the principle that the filter multi-zero produces as shown in Figure 5.Electromagnetic signal from the input port to the output port through different path, identical in the amplitude of a certain frequency signal, phase place is opposite, thus cancel out each other the generation transmission zero.When electromagnetic signal is passed through described filter, two very directly paths are arranged, article one is to be coupled to T shape resonator from input port, is coupled to output port from T shape resonator again, shown in the path among Fig. 5 51; The second path is to be directly coupled to output port from input port by interdigital coupling line, shown in the path among Fig. 5 52.Such mulitpath makes the frequency response of filter extra transmission zero occur.And interdigital coupling line can wait and change two stiffness of couplings between the port by changing its length, live width, distance between centers of tracks, and coupling line is long more, live width is thin more, distance between centers of tracks is more little, and the stiffness of coupling between the port is just big more.And the situation of filter transmission zero can be according to the difference of stiffness of coupling between port and difference, and when stiffness of coupling increased gradually by zero, the number of the limited transmission zero of filter can be increased to four by zero; Simultaneously, the transmission zero on passband both sides can make that the transition band of filter is more and more precipitous more and more near centre frequency, and selectivity is become better and better; Simultaneously, the outer inhibition of band also becomes better because a plurality of transmission zeros have been arranged.Increase gradually in the process that slowly changes with dead-center position in transmission zero, any variation does not take place in the centre frequency of filter and bandwidth.Fig. 6 and Fig. 7 are respectively the Electromagnetic Simulation frequency response curve when the filter among Fig. 1 has 3 and 4 transmission zeros, what Fig. 8 represented is the filter Electromagnetic Simulation frequency response curve that the interdigital coupling line of short circuit is arranged between the port shown in Fig. 2, wherein S21 is the loss curve, and S11 is the reflection loss curve.From Fig. 7 and Fig. 8, can see a transmission zero respectively being arranged, thereby make that the transition band of filter transmission curve is very precipitous on the passband both sides of filter.Simultaneously, also have two transmission zeros, make that again the band outside inhibitory of filter can be comparatively desirable at high stopband.Filter shown in Figure 2 also has the function that suppresses parasitic passband and second harmonic.Quadravalence is also the same with the second order source end coupling microstrip filter with six rank source end coupling microstrip filters, because signal exists mulitpath from the input port to the output port, thereby makes filter freguency response also have 4 transmission zeros, as Fig. 9 and shown in Figure 10.In like manner, end coupling in source, 2n rank also has the same characteristic arbitrarily.
The foregoing description 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 spirit 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 (10)
1. a source end coupling microstrip filter is characterized in that: comprise a T shape resonator, input coupling feed, output coupling feed, one group of interdigital coupling line; Wherein T shape resonator has two open circuit minor matters and short circuit minor matters, two open circuit minor matters constitute the both sides of U-shaped microstrip line, the short circuit minor matters are arranged on the bottom of described U-shaped microstrip line, the short-circuit end of short circuit minor matters is provided with grounding through hole, and the length sum of two open a way minor matters and short circuit minor matters is 1/2nd wavelength; Input coupling feed, output coupling feed are coupled with the open circuit minor matters in the inboard of the open circuit minor matters of T shape resonator; Interdigital coupling line is positioned at T shape resonator, and is arranged between input coupling feed and the output coupling feed.
2. source end coupling microstrip filter according to claim 1 is characterized in that: described interdigital coupling line with the input coupling feed, output coupling feed vertical.
3. source end coupling microstrip filter according to claim 2 is characterized in that: described interdigital coupling line is provided with at least 2.
4. source end coupling microstrip filter according to claim 2 is characterized in that: described interdigital coupling line is for the interdigital coupling line of open circuit or be the interdigital coupling line of short circuit.
5. source end coupling microstrip filter according to claim 4 is characterized in that: when described interdigital coupling line was the interdigital coupling line of short circuit, the short-circuit end of interdigital coupling line was provided with grounding through hole.
6. a source end coupling microstrip filter is characterized in that: comprise two T shape resonator, input coupling feed, output coupling feed, interdigital coupling lines of two groups that embed the coupling cascade at least at least; Wherein each T shape resonator all has two open circuit minor matters and short circuit minor matters, two open circuit minor matters constitute the both sides of U-shaped microstrip line, the short circuit minor matters are arranged on the bottom of described U-shaped microstrip line, the short-circuit end of short circuit minor matters is provided with grounding through hole, and the length sum of two open a way minor matters and short circuit minor matters is 1/2nd wavelength; Input coupling feed, output coupling feed are coupled at the inboard of the open circuit minor matters of first T shape resonator, last T shape resonator and with corresponding open circuit minor matters respectively; Every group of interdigital coupling line all is positioned at T shape resonator, and be arranged on input coupling feed or output coupling feed and and this T shape resonator embed between the open circuit minor matters of T shape resonator of coupling cascade, or be arranged on and this T shape resonator embeds between the open circuit minor matters of two T shape resonators of coupling cascade.
7. source end coupling microstrip filter according to claim 6 is characterized in that: comprise the T shape resonator and the 2nd T shape resonator that embed the coupling cascade, and first group of interdigital coupling line, second group of interdigital coupling line; First group of interdigital coupling line is positioned at a T shape resonator, and is arranged between the open circuit minor matters of input coupling feed and the 2nd T shape resonator; Second group of interdigital coupling line is positioned at the 2nd T shape resonator, and is arranged between the open circuit minor matters of an output coupling feed and a T shape resonator.
8. source end coupling microstrip filter according to claim 6, it is characterized in that: comprise the T shape resonator, the 2nd T shape resonator, the 3rd T shape resonator that embed the coupling cascade, and first group of interdigital coupling line, second group of interdigital coupling line, the 3rd group of interdigital coupling line; First group of interdigital coupling line is positioned at a T shape resonator, and is arranged between the open circuit minor matters of input coupling feed and the 2nd T shape resonator; Second group of interdigital coupling line is positioned at the 2nd T shape resonator, and is arranged between the open circuit minor matters of the open circuit minor matters of a T shape resonator and the 3rd T shape resonator; The 3rd group of interdigital coupling line is positioned at the 3rd T shape resonator, and is arranged between the open circuit minor matters of output coupling feed and the 2nd T shape resonator.
9. according to each described source end coupling microstrip filter among the claim 6-8, it is characterized in that: every group of interdigital coupling line is equipped with at least 2 interdigital coupling lines.
10. according to each described source end coupling microstrip filter among the claim 6-8, it is characterized in that: every group of interdigital coupling line is the interdigital coupling line of open circuit or is the interdigital coupling line of short circuit.
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| CN102522615B (en) * | 2011-12-01 | 2014-11-12 | 华南理工大学 | Miniature dual-band band-pass filter with adjustable low band |
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| CN107666034A (en) * | 2016-07-28 | 2018-02-06 | 大唐终端技术有限公司 | A kind of antenna assembly and mobile terminal |
| CN107666034B (en) * | 2016-07-28 | 2024-05-10 | 大唐终端技术有限公司 | Antenna device and mobile terminal |
| CN108110388A (en) * | 2017-12-12 | 2018-06-01 | 中国船舶重工集团公司第七〇九研究所 | Electricity adjusts the constant bandwidth broadband filter of transmission zero |
| CN108123193A (en) * | 2018-02-07 | 2018-06-05 | 南京信息工程大学 | A kind of transmission zero variable band-pass filter of T-shaped source load coupling |
| CN108461877A (en) * | 2018-02-07 | 2018-08-28 | 南京信息工程大学 | A kind of transmission zero variable band-pass filter of π types source load coupling |
| CN110518324A (en) * | 2019-07-16 | 2019-11-29 | 杭州电子科技大学 | It is a kind of with it is outer introduce dual transfer zero broadband filter |
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