CN105789774A - Ultra wideband dual-frequency pass-band filter based on stepped impedance resonator - Google Patents
Ultra wideband dual-frequency pass-band filter based on stepped impedance resonator Download PDFInfo
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- CN105789774A CN105789774A CN201410815276.5A CN201410815276A CN105789774A CN 105789774 A CN105789774 A CN 105789774A CN 201410815276 A CN201410815276 A CN 201410815276A CN 105789774 A CN105789774 A CN 105789774A
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Abstract
The invention discloses an ultra wideband dual-frequency pass-band filter based on a stepped impedance resonator. The ultra wideband dual-frequency pass-band filter comprises a first input-output end (101), a second input-output end (102), a first open-loop stepped impedance resonator (103), a second open-loop stepped impedance resonator (104), a first loading double-branch line (105), a second loading double-branch line (106), a dielectric substrate (107) and a metal grounding plate (108) under the dielectric substrate. The filter has the advantages of simple design, compact structure and low cost, and is convenient to process, and adjustable dual-frequency pass-band performance can be achieved.
Description
Technical field
The present invention relates to the ultra-broadband dual-frequency band filter based on step electric impedance resonator, this wave filter is a kind of dual frequency filter realizing source load coupling based on bimodulus step electric impedance resonator.Two passbands of double frequency filter are respectively provided with the coupling of independent end and Incoupling structure, have dual-passband frequency and all individually controllable double frequency band-pass filter of bandwidth ensureing to achieve on the undersized basis of wave filter.
Background technology
In February, 2002, FCC (FCC) ratifies 3.1-10.6GHz frequency range for business telecommunication, and therefore ultra broadband is widely used.But, in the commercial scope of FCC definition, ultra-broadband 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 ultra broadband research important content, multiband filter is as one of Primary Component indispensable in Multi-Frequency Signaling System, and ultra wideband multi-band band 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 multimode 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 to realize the ultra-broadband dual-frequency band filter based on step electric impedance resonator significant.
Summary of the invention
It is an object of the invention to the ultra-broadband dual-frequency band filter based on step electric impedance resonator, the design adopts planar microstrip structure, design the ultra-broadband dual-frequency band filter based on step electric impedance resonator that can cover whole WLAN frequency range, in its frequency range, achieve relatively low insertion loss, further reduce the volume of wave filter.
The technical solution adopted in the present invention:
A kind of novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, including the first input/output terminal (101), the second input/output terminal (102), first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104), first loads double branch line (105), the second loading double branch line (106), medium substrate (107), the metal ground plate (108) under medium substrate.
The described novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, it is characterized in that the first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104) are symmetrical arranged side by side, the opening of its open loop is oppositely arranged, it is provided with the first loading double branch line (105) on the opposite of the first open loop step electric impedance resonator inner opening, is provided with the second loading double branch line (106) on the opposite of the second open loop step electric impedance resonator inner opening.
The described novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, it is characterized in that the first input/output terminal (101) is connected with the first open loop step electric impedance resonator (103), the second input/output terminal (102) is connected with the second open loop step electric impedance resonator (104).
The described novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, by changing the length sum of the various piece microstrip line of the first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104), regulate the band connection frequency of the first passband.
The described novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, load the length of double branch line (106) and the spacing of branch line by changing the first loading double branch line (105) and second, regulate the band connection frequency of the second passband.
The described novel ultra-broadband dual-frequency band filter based on step electric impedance resonator, first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104) opening adopt the second gap (g2) to couple in coming, and adopt the first gap (g1) to carry out interstage coupling between two open loop step electric impedance resonators.
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 the first passband work, first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104) work, and first loads double branch line (105) and the second loading double branch line (106) does not work, by adjusting the coupling space source of the introducing-load coupling of bimodulus stepped impedance counterfoil resonator, can respectively introduce a transmission zero in the first passband both sides, improve the first passband selectivity.
When the second passband work, first loads double branch line (105) and second loads double branch line (106) work, first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104) feed for tap, a zero point can be produced between two passbands, be effectively improved the stopband attenuation between passband.When the second passband work, the second resonant frequency can be regulated by the length of relative distance and size and two parallel coupled lines that adjustment the first loading double branch line (105) and second load double branch line (106).
Accompanying drawing explanation
Fig. 1 is the basic structure top view of the invention process example；
Fig. 2 is the basic structure dimensional drawing of the invention process example；
Fig. 3 is the basic structure side view of the invention process example；
Fig. 4 is the frequency response curve of the invention process example；
Detailed description of the invention
The present invention devises the ultra-broadband dual-frequency band filter based on bimodulus stepped impedance counterfoil resonator, and filter band characteristic 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 as in figure 2 it is shown, medium substrate (107) relative dielectric constant ε R=2.65 substrate on, TAN δ=0.001 and h=1 millimeter.Conductor thickness is 35 microns is 6.14 × 107S/s with electrical loss, and the metal ground plate (108) under medium substrate adopts copper product.Based on the double frequency band-pass filter of double branch line loading stepped-impedance resonator, it is characterized in that 50 ohm of couplings impedance of described first input/output terminal (101), the second input/output terminal (102) respectively described double frequency band-pass filter.
As shown in Figure 2, the ultra-broadband dual-frequency band filter based on bimodulus stepped impedance counterfoil resonator of present invention design, first input/output terminal (101), the second input/output terminal (102), first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104), the first loading double branch line (105), the second loading double branch line (106) all adopt copper product.
As in figure 2 it is shown, the design parameter of the ultra-wide band filter of the double; two trap characteristic of this invention: size following W=2.73mm, the W1=1.2mm of parameters, W2=2.2mm, L1=6.9mm, L2=11.7mm, L3=12.97mm, L4=3.5mm, L5=6.26mm, L6=4.06mm, L7=3.9mm, g1=0.32mm, g2=0.7mm, g3=0.5mm.
As shown in Figures 2 and 3, the ultra-broadband dual-frequency band filter based on bimodulus stepped impedance counterfoil resonator of the present invention, wherein adjust the first resonant frequency of the first passband by regulating the length of each microstrip line of the first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104), regulate the second resonant frequency of the second passband by regulating the length of relative distance and size and two parallel coupled lines that the first loading double branch line (105) and second loads double branch line (106).
Fig. 4 provides the frequency response curve of this example.In figure, curve | S21 | is the transfer curve of signal, and curve | S11 | is the coverage diagram of port.As seen from the figure, based on the ultra-broadband dual-frequency band filter of bimodulus stepped impedance counterfoil resonator, at 1.85GHz and 2.66GHz, there is good dual-passband performance.In adjacent dual-passband, it is achieved four transmission zeros, it is achieved that the individually controllable property of the mid frequency of the passband of wave filter and good selectivity.
Claims (6)
1. include the first input/output terminal (101), the second input/output terminal (102) based on the ultra-broadband dual-frequency band filter of step electric impedance resonator, first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104), first loads double branch line (105), the second loading double branch line (106), medium substrate (107), the metal ground plate (108) under medium substrate.
2. the ultra-broadband dual-frequency band filter based on step electric impedance resonator novel according to claim 1, it is characterized in that the first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104) are symmetrical arranged side by side, the opening of its open loop is oppositely arranged, it is provided with the first loading double branch line (105) on the opposite of the first open loop step electric impedance resonator inner opening, is provided with the second loading double branch line (106) on the opposite of the second open loop step electric impedance resonator inner opening.
3. the ultra-broadband dual-frequency band filter based on step electric impedance resonator novel described in, it is characterized in that the first input/output terminal (101) is connected with the first open loop step electric impedance resonator (103), the second input/output terminal (102) is connected with the second open loop step electric impedance resonator (104).
4. the ultra-broadband dual-frequency band filter based on step electric impedance resonator novel described in, by changing the length sum of the various piece microstrip line of the first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104), regulate the band connection frequency of the first passband.
5. the ultra-broadband dual-frequency band filter based on step electric impedance resonator novel described in, load the length of double branch line (106) and the spacing of branch line by changing the first loading double branch line (105) and second, regulate the band connection frequency of the second passband.
6. the ultra-broadband dual-frequency band filter based on step electric impedance resonator novel described in, first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104) opening adopt the second gap (g2) to couple in coming, and adopt the first gap (g1) to realize interstage coupling between two open loop step electric impedance resonators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815276.5A CN105789774A (en) | 2014-12-23 | 2014-12-23 | Ultra wideband dual-frequency pass-band filter based on stepped impedance resonator |
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| CN201410815276.5A CN105789774A (en) | 2014-12-23 | 2014-12-23 | Ultra wideband dual-frequency pass-band filter based on stepped impedance resonator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549227A (en) * | 2016-10-20 | 2017-03-29 | 南京理工大学 | A kind of dual-band dual-circular polarization common reflector |
| CN107134613A (en) * | 2017-04-25 | 2017-09-05 | 西安电子科技大学 | Three band band-pass filters of resonator are loaded based on open circuit minor matters |
| CN112072230A (en) * | 2020-09-08 | 2020-12-11 | 重庆邮电大学 | Double-frequency microstrip filtering antenna based on open-circuit branch loaded SIR |
-
2014
- 2014-12-23 CN CN201410815276.5A patent/CN105789774A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549227A (en) * | 2016-10-20 | 2017-03-29 | 南京理工大学 | A kind of dual-band dual-circular polarization common reflector |
| CN107134613A (en) * | 2017-04-25 | 2017-09-05 | 西安电子科技大学 | Three band band-pass filters of resonator are loaded based on open circuit minor matters |
| CN112072230A (en) * | 2020-09-08 | 2020-12-11 | 重庆邮电大学 | Double-frequency microstrip filtering antenna based on open-circuit branch loaded SIR |
| CN112072230B (en) * | 2020-09-08 | 2021-11-02 | 重庆邮电大学 | Double-frequency microstrip filtering antenna based on open-circuit branch loaded SIR |
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Application publication date: 20160720 |