CN105789767A - Bandwidth compact type controllable UWB (Ultra-Wide Bandwidth) tri-band-pass filter - Google Patents
Bandwidth compact type controllable UWB (Ultra-Wide Bandwidth) tri-band-pass filter Download PDFInfo
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- CN105789767A CN105789767A CN201410810619.9A CN201410810619A CN105789767A CN 105789767 A CN105789767 A CN 105789767A CN 201410810619 A CN201410810619 A CN 201410810619A CN 105789767 A CN105789767 A CN 105789767A
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Abstract
The invention discloses a bandwidth compact type controllable UWB (Ultra-Wide Bandwidth) tri-band-pass filter. The filter comprises a double-mode resonator (101) loaded in a first middle short-circuited stub and located on the surface of a dielectric substrate, a double-mode resonator (102) loaded in a second middle short-circuited stub, two embedded half-wavelength resonators (103), input and output ports (104) directly connected with the two resonators in a tap-coupling manner, the dielectric substrate (105), and a metal grounding plate (106) at the lower part of the dielectric substrate. According to the filter, three independent and controllable resonant modes are realized by utilizing the double-mode resonators loaded in the short-circuited stubs and the half-wavelength resonator; the pass-band characteristics of three pass-bands of the filter are independent and controllable; and the filter is simple in design, compact in structure, convenient to machine and low in cost.
Description
Technical field
The present invention relates to bandwidth compact controlled UWB tri-band-pass filter, this wave filter is respectively provided with independent end coupling and Incoupling structure at three passbands, ensureing on the undersized basis of wave filter, it is achieved that there are three band connection frequencies and all individually controllable three band-pass filters of bandwidth.
Background technology
In February, 2002, FCC (FCC) ratifies 3.1-10.6GHz frequency range for business telecommunication, and therefore UWB is widely used.But, in the commercial scope of FCC definition, UWB signal is likely to be subject to the interference of the signals such as such as WiAX (3.5-GHz), WLAN (5.15-5.825GHz), RFID (6.8GHz).How solving co-channel interference and become UWB research important content, multiband filter is as one of Primary Component indispensable in Multi-Frequency Signaling System, and UWB tri-band-pass filter obtains extensive concern and research.
Occurring in that some mentalities of designing in recent years, existing multifrequency microstrip filter prevailing design approach mainly has two kinds, and the first is to utilize multiple single-pass band filter modular design multiband filter.The second is to utilize dual-mode resonator to design multiband filter, including step electric impedance resonator multiband filter, loaded type resonator multiband filter.Wave filter overall dimensions designed by first method is big, cost is high, is unfavorable for the miniaturization of Multi-Frequency Signaling System.Multiband filter designed by second method is easy to control, but can only basically reach each band connection frequency of multiband filter, and the bandwidth of achieved passband is too small.So design multiband filter can realize big bandwidth and UWB tri-that dual-passband is controlled frequency wave filter have great importance.
Summary of the invention
The UWB tri-frequency wave filter that it is an object of the invention to structure dual-passband controlled has two groups of resonators, the dual-mode resonator of namely peripheral middle short circuit minor matters loading and embedded two half-wave resonator, input/output port is joined directly together respectively by tap coupler and two resonators.
The technical solution adopted in the present invention:
A kind of novel bandwidth compact controlled UWB tri-band-pass filter, this wave filter includes the dual-mode resonator (101) that in the middle of the first of dielectric-slab surface, short circuit minor matters load, the dual-mode resonator (102) that in the middle of second, short circuit minor matters load, two embedded half-wave resonator (103), input/output port (104), medium substrate (105), the metal ground plate (106) under medium substrate.
Described novel bandwidth compact controlled UWB tri-band-pass filter is characterized in that, the dual-mode resonator (101) that in the middle of first, short circuit minor matters load, the dual-mode resonator (102) that in the middle of second, short circuit minor matters load, two embedded half-wave resonator (103), input/output port (103) is symmetrical about the grounding through hole at center.
Described novel bandwidth compact controlled UWB tri-band-pass filter, the dual-mode resonator (101) loaded by middle short circuit minor matters controls the characteristic of the first passband, by changing the length sum of each several part microstrip line of the dual-mode resonator (101) that middle short circuit minor matters load, change the band connection frequency of the first passband.
Described novel bandwidth compact controlled UWB tri-band-pass filter, with in short circuit minor matters load in the middle of second dual-mode resonator (102) control the characteristic of the second passband, by changing the length sum of each several part microstrip line of the dual-mode resonator (102) that middle short circuit minor matters load, change the band connection frequency of the second passband.
Described novel bandwidth compact controlled UWB tri-band-pass filter, controls the characteristic of the 3rd passband with two embedded half-wave resonator (103), by changing the length sum of its each several part microstrip line, changes the band connection frequency of the 3rd passband.
This invention wave filter has following characteristic and advantage relative to existing wave filter:
Design is simple, compact conformation, easy to process, with low cost, passband is adjustable, and bandpass characteristics is adjustable.
When peripheral short-circuit minor matters load dual-mode resonator work, this wave filter is operated in the first passband.Even mould fundamental frequency can be independently controlled by middle short circuit minor matters, such that it is able to coupling size when controlling passband 1.
During dual-mode resonator (102) work that in the middle of second, short circuit minor matters load, this wave filter is operated in the second passband.Opening resonator does not work and as the part of input port output port, by adjusting the coupling space source of introducing-load coupling of two adjacent opening resonators.
During opening resonator works, when wave filter is operated in three passbands, input port output port directly and connects between opening resonator, forms tap feed.
Accompanying drawing explanation
Fig. 1 is the basic structure top view of the invention process example；
Fig. 2 is the basic structure side view of the invention process example；
Fig. 3 is the frequency response characteristic figure of the invention process example；
Detailed description of the invention
The present invention devises bandwidth compact controllable multi-frequency band filter, and wave filter trap is adjustable, passband is adjustable for this, and both adjustment are not interfere with each other.
Below in conjunction with accompanying drawing distance, invention is described in more detail:
An example of the present invention is as in figure 2 it is shown, medium substrate (105) is K dielectric constant is the ArlonDiClad880 of 2.2.The thickness of this medium substrate is 0.508mm, and the thickness of this medium substrate is that 0.508mm meets required intensity, and the metal ground plate (105) under medium substrate adopts copper product.
As shown in Figure 1, controlled three band-pass filters of bandwidth compact of the present invention, dual-mode resonator (102), embedded two half-wave resonator (103) and input/output port (104) that in the middle of the middle dual-mode resonator (101) of short circuit minor matters loading, the first of inner side, short circuit minor matters load adopt copper product.
As shown in Figure 2, controlled three band-pass filters of bandwidth compact of the present invention, the length of dual-mode resonator (101) each microstrip line wherein loaded by short circuit minor matters in the middle of regulating adjusts the bandpass characteristics of the first passband, regulates the bandpass characteristics of the second passband by regulating the length of each microstrip line of embedded two half-wave resonator (102).
The design parameter of the UWB wave filter of the double; two trap characteristic of this invention: size following L=0.48mm, L1=5.90mm, the L2=L3=0.60mm of parameters, L4=4.28mm, L5=12.32mm, L6=17.3mm, L7=4.11mm, L8=1.62mm, L9=2.32mm, L10=2.32mm, L11=2.32mm, L12=10.64mm, W1=2.00mm, W2=W3=0.50mm, W4=0.60mm, W5=1.00mm, S=0.64mm, d=3.48mm, g1=0.32mm, g2=0.38mm, g3=0.36mm, R=0.30mm.
The design of multimode resonator: the dual-mode resonator (101) that middle short circuit minor matters load controls the characteristic of the first passband, by adjusting the coupling space source of the introducing-load coupling of two adjacent opening resonators.Control the characteristic of the second passband with two embedded half-wave resonator (102), between the microstrip line that two opening resonators are adjacent, form parallel coupling.During opening resonator works, wave filter is operated in the 3rd passband.By coupling the design in gap and tap position, it is possible to freely control the end coupling size under three passbands, it is achieved the design of three pass band widths.
Fig. 3 provides the frequency response characteristic of wave filter and includes transmission characteristic i.e. | S21 | amplitude response, and reflection characteristic is | S11 | amplitude response, it addition, also require to have in passband smooth delay character for ultra-wide band filter.Three transmission zeros lay respectively at 2.02GHz, 5.02GHz, 6.79GHz as seen from the figure；Decay between the three frequency each passbands of wave filter is all higher than 20dB, and each passband has good selectivity.
Claims (5)
1. bandwidth compact controlled UWB tri-band-pass filter, including the dual-mode resonator (101) that the first middle short circuit minor matters on dielectric-slab surface load, the dual-mode resonator (102) that in the middle of second, short circuit minor matters load, two embedded half-wave resonator (103), the input/output port (104) being joined directly together by tap coupler mode with two resonators, medium substrate (105), the metal ground plate (106) under medium substrate.
2. bandwidth compact according to claim 1 controlled UWB tri-band-pass filter is characterized in that, the dual-mode resonator (101) that in the middle of first, short circuit minor matters load, the dual-mode resonator (102) that in the middle of second, short circuit minor matters load, two embedded half-wave resonator (103), input/output port (103) is symmetrical about the grounding through hole at center.
3. bandwidth compact controlled UWB tri-band-pass filter described in, the dual-mode resonator (101) loaded by middle short circuit minor matters controls the characteristic of the first passband, by changing the length sum of each several part microstrip line of the dual-mode resonator (101) that middle short circuit minor matters load, change the band connection frequency of the first passband.
4. bandwidth compact controlled UWB tri-band-pass filter described in, with in short circuit minor matters load in the middle of second dual-mode resonator (102) control the characteristic of the second passband, by changing the length sum of each several part microstrip line of the dual-mode resonator (102) that middle short circuit minor matters load, change the band connection frequency of the second passband.
5. bandwidth compact controlled UWB tri-band-pass filter described in, controls the characteristic of the 3rd passband with two embedded half-wave resonator (103), by changing the length sum of its each several part microstrip line, changes the band connection frequency of the 3rd passband.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410810619.9A CN105789767A (en) | 2014-12-23 | 2014-12-23 | Bandwidth compact type controllable UWB (Ultra-Wide Bandwidth) tri-band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410810619.9A CN105789767A (en) | 2014-12-23 | 2014-12-23 | Bandwidth compact type controllable UWB (Ultra-Wide Bandwidth) tri-band-pass filter |
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| CN105789767A true CN105789767A (en) | 2016-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131108A (en) * | 2021-03-22 | 2021-07-16 | 华东交通大学 | Balance filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131108A (en) * | 2021-03-22 | 2021-07-16 | 华东交通大学 | Balance filter |
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Application publication date: 20160720 |