CN204375892U - Based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator - Google Patents
Based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator Download PDFInfo
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- CN204375892U CN204375892U CN201420830717.4U CN201420830717U CN204375892U CN 204375892 U CN204375892 U CN 204375892U CN 201420830717 U CN201420830717 U CN 201420830717U CN 204375892 U CN204375892 U CN 204375892U
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Abstract
The utility model discloses the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, comprise the first input/output terminal (101), second input/output terminal (102), first open loop step electric impedance resonator (103), second open loop step electric impedance resonator (104), first bimodulus stepped impedance counterfoil resonator (105), second bimodulus stepped impedance counterfoil resonator (106), first Coupled Miccrostrip Lines (107), second Coupled Miccrostrip Lines (108), metal ground plate (1010) under medium substrate (109) and medium substrate.This design of filter is simple, compact conformation, easy to process, with low cost, can to realize double frequency band-pass behavior adjustable.
Description
Technical field
The utility model relates to the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, and this filter is a kind of dual frequency filter realizing source load coupling based on bimodulus stepped impedance counterfoil resonator.Double frequency filter two passbands have independently end coupling and Incoupling structure respectively, the guarantee undersized basis of filter achieves and has dual-passband frequency and all independent controlled double frequency band-pass filter of bandwidth.
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 may 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 to solve 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 pass filter obtains extensive concern and research.
Occurred some mentalities of designing in recent years, existing multifrequency microstrip filter prevailing design approach mainly contains two kinds, and the first utilizes multiple single-pass band filter Combination Design multiband filter.The second utilizes multimode resonator to design multiband filter, comprises step electric impedance resonator multiband filter, loaded type resonator multiband filter.Overall filter size designed by first method is large, cost is high, is unfavorable for the miniaturization of Multi-Frequency Signaling System.Multiband filter designed by second method is easy to control, but substantially can only reach each band connection frequency of multiband filter, and the bandwidth of achieved passband is too small.So the compact double frequency band-pass ultra-wide band filter that can realize based on step electric impedance resonator of design multiband filter is significant.
Utility model content
The purpose of this utility model is the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, the design adopts planar microstrip structure, design the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator that can cover whole WLAN frequency range, in its frequency range, achieve lower insertion loss, further reduce the volume of filter.
The technical scheme that the utility model adopts:
A kind of novel compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, comprise the first input/output terminal (101), second input/output terminal (102), first open loop step electric impedance resonator (103), second open loop step electric impedance resonator (104), first bimodulus stepped impedance counterfoil resonator (105), second bimodulus stepped impedance counterfoil resonator (106), first Coupled Miccrostrip Lines (107), second Coupled Miccrostrip Lines (108), medium substrate (109), metal ground plate (1010) under medium substrate.
Wherein, 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 arranged in opposite directions, be provided with the first bimodulus stepped impedance counterfoil resonator (105) on the opposite of the first open loop step electric impedance resonator inner opening, be provided with the second bimodulus stepped impedance counterfoil resonator (106) on the opposite of the second open loop step electric impedance resonator inner opening.
Wherein, the first input/output terminal (101) is connected with the first open loop step electric impedance resonator (103), and the second input/output terminal (102) is connected with the second open loop step electric impedance resonator (104).
Wherein, 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 carry out interior coupling, adopt the first gap (g1) to carry out interstage coupling between two open loop step electric impedance resonators.First Coupled Miccrostrip Lines (107) and the second Coupled Miccrostrip Lines (108) adopt the first gap (g3) to realize coupling.
This utility model filter has following characteristic and advantage relative to existing filter:
Simplicity of design, 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 the first bimodulus stepped impedance counterfoil resonator (105) and the second bimodulus stepped impedance counterfoil resonator (106) do not work, by the coupling space source of the introducing-load coupling of adjustment bimodulus stepped impedance counterfoil resonator, can respectively introduce a transmission zero in the first passband both sides, improve the first passband selectivity.
Design based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator: when the second passband work, first bimodulus stepped impedance counterfoil resonator (105) and the work of the second bimodulus stepped impedance counterfoil resonator (106), first open loop step electric impedance resonator (103), the second open loop step electric impedance resonator (104) are tap feed, a zero point can be produced between two passbands, effectively improve the stopband attenuation between passband.
In first passband situation, adopting the first gap (g1) source of introducing-load coupling by adjusting between two open loop step electric impedance resonators, can respectively introduce a transmission zero in the first passband both sides, effectively improve the first passband selectivity.In second passband situation, input port output port directly and between open loop step electric impedance resonator connects, and forms tap feed, can respectively introduce a transmission zero in the second passband both sides, effectively improves the selectivity of the second passband.
The Main Function of two Coupled Miccrostrip Lines first Coupled Miccrostrip Lines (107) and the second Coupled Miccrostrip Lines (108) is the bandwidth being reached increase by second passband by the coupling coefficient increased between two open loop stepped impedance resonant cavitys, loads to compare to adopt step electric impedance resonator to have more variable to regulate frequency bandwidth characteristics with traditional uniform impedance resonator and single branch line.
Accompanying drawing explanation
Fig. 1 is the basic structure vertical view of the utility model embodiment;
Fig. 2 is the basic structure dimensional drawing of the utility model embodiment;
Fig. 3 is the basic structure end view of the utility model embodiment;
Fig. 4 is the frequency response curve of the utility model embodiment;
Embodiment
The utility model devises the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, and this filter band characteristic is adjustable, passband is adjustable, and both adjustment do not interfere with each other.
Below in conjunction with accompanying drawing distance, utility model is described in more detail:
An example of the present utility model as shown in Figure 2, on the substrate of the relative dielectric constant ε R=2.65 of medium substrate (109), TAN δ=0.001 and h=1 millimeter.Conductor thickness is 35 microns and electrical loss is 6.14 × 107S/s, 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 described first input/output terminal (101), 50 ohm of matched impedances that the second input/output terminal (102) is respectively described double frequency band-pass filter.
As shown in Figure 2, the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator of the utility model 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), first bimodulus stepped impedance counterfoil resonator (105), the second bimodulus stepped impedance counterfoil resonator (106), first Coupled Miccrostrip Lines (107), the second Coupled Miccrostrip Lines (108) all adopts copper product.
As shown in Figure 2, the design parameter of the ultra-wide band filter of the two trap characteristic of this utility model: size following W=2.73mm, the W1=1.8mm of parameters, W2=2.2mm, L1=6.9mm, L2=11.7mm, L3=12.97mm, L4=3.5mm, L5=6.9mm, L6=2.9mm, L7=3.9mm, L8=26mm, g1=0.32mm, g2=3.78mm, g3=0.44mm.
As shown in Figures 2 and 3, compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator of the present utility model, wherein adjusted the bandpass characteristics of the first passband by the length of each microstrip line of adjustment first open loop step electric impedance resonator (103) and the second open loop step electric impedance resonator (104), by the bandpass characteristics regulating the length of the first bimodulus stepped impedance counterfoil resonator (105) and second bimodulus stepped impedance counterfoil resonator (106) each microstrip line to regulate the second passband.
Fig. 4 provides the frequency response curve of this example.Curve in figure | S21| is the transfer curve of signal, curve | S11| is the coverage diagram of port.As seen from the figure, based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator, at 1.80GHz and 2.61GHz, there is good dual-passband performance.In adjacent dual-passband, realize four transmission zeros, achieve the independent controllability of the centre frequency of the passband of filter and good selectivity.
Claims (4)
1. the novel compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator, comprise the first input/output terminal (101), second input/output terminal (102), first open loop step electric impedance resonator (103), second open loop step electric impedance resonator (104), first bimodulus stepped impedance counterfoil resonator (105), second bimodulus stepped impedance counterfoil resonator (106), first Coupled Miccrostrip Lines (107), second Coupled Miccrostrip Lines (108), medium substrate (109), metal ground plate (1010) under medium substrate.
2. the compact double frequency band-pass ultra-wide 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 arranged in opposite directions, be provided with the first bimodulus stepped impedance counterfoil resonator (105) on the opposite of the first open loop step electric impedance resonator inner opening, be provided with the second bimodulus stepped impedance counterfoil resonator (106) on the opposite of the second open loop step electric impedance resonator inner opening.
3. the compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator according to claim 1, 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 compact double frequency band-pass ultra-wide band filter based on step electric impedance resonator 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) opening adopt the second gap (g2) to carry out interior coupling, between two open loop step electric impedance resonators, adopt the first gap (g1) to carry out interstage coupling.First Coupled Miccrostrip Lines (107) and the second Coupled Miccrostrip Lines (108) adopt the first gap (g3) to realize coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830717.4U CN204375892U (en) | 2014-12-23 | 2014-12-23 | Based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830717.4U CN204375892U (en) | 2014-12-23 | 2014-12-23 | Based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator |
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| CN204375892U true CN204375892U (en) | 2015-06-03 |
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| CN201420830717.4U Expired - Fee Related CN204375892U (en) | 2014-12-23 | 2014-12-23 | Based on the compact double frequency band-pass ultra-wide band filter of step electric impedance resonator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720339A (en) * | 2016-03-30 | 2016-06-29 | 华南理工大学 | Dual-band adjustable band-pass filter |
-
2014
- 2014-12-23 CN CN201420830717.4U patent/CN204375892U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720339A (en) * | 2016-03-30 | 2016-06-29 | 华南理工大学 | Dual-band adjustable band-pass filter |
| CN105720339B (en) * | 2016-03-30 | 2018-07-20 | 华南理工大学 | A kind of double frequency variable band-pass filter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20151223 |
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| EXPY | Termination of patent right or utility model |