CN103855449A - Double-trap-wave UWB filter with adjustable trap wave and adjustable passband - Google Patents
Double-trap-wave UWB filter with adjustable trap wave and adjustable passband Download PDFInfo
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- CN103855449A CN103855449A CN201210504523.0A CN201210504523A CN103855449A CN 103855449 A CN103855449 A CN 103855449A CN 201210504523 A CN201210504523 A CN 201210504523A CN 103855449 A CN103855449 A CN 103855449A
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- counterfoil
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Abstract
The invention discloses a double-trap-wave UWB filter with an adjustable trap wave and an adjustable passband. The filter is composed of a medium substrate (104), a multimode resonant cavity (101) arranged on the medium substrate, a microstrip structure (103) of an open-circuit stub, a combined type transmission coupling line (102), and a metal grounding plate (105) below the medium substrate. The multimode resonant cavity is utilized to realize passband bandwidth and the adjustable passband required by UWB, and the microstrip structure of the open-circuit stub is utilized to realize double trap wave and the adjustable trap wave. The filter is great in double trap wave characteristics. The trap wave is near 5.2/5.7Ghz so that interference of WLAN signals to the UWB filter can be filtered. The filter is simple in design, compact in structure, convenient to process, low in cost, adjustable in passband and adjustable in trap wave.
Description
Technical field
The present invention relates to two trap UWB filters that a kind of trap is adjustable and passband is adjustable, this filter can filtering UWB in the interference of WLAN signal.
Background technology
In February, 2002, FCC (FCC) approval 3.1-10.6GHz frequency range is for business telecommunication, and therefore UWB is widely used.But in the commercial scope of FCC definition, UWB signal may be subject to such as WiAX(3.5-GHz), WLAN(5.15-5.825GHz), RFID(6.8GHz) etc. the interference of signal.How solving co-channel interference becomes UWB research important content, and the filter therefore with trap characteristic has very high practical value.
Occurred in recent years some mentalities of designing, as multimode resonator (MMR), via structure etc., although these structures can realize trap effect, but trap is non-adjustable.Or introduce the poor line of rabbet joint that refers to, and realize two trap characteristics, although trap is adjustable, the passband of broadband filter is non-adjustable.So it is adjustable that design has passband, two trap UWB filters that trap is adjustable have great importance.
Summary of the invention
The object of the present invention is to provide and have two trap UWB filters that passband is adjustable and trap is adjustable, this filter can reduce the interference of WLAN signal to UWB signal.
The technical solution adopted in the present invention:
Two trap UWB filters that a kind of novel trap is adjustable and passband is adjustable, comprise and be formed at the multimode cavity (101) of dielectric-slab upper surface, microstrip structure (103), the combined transmission coupling line (102) of open circuit counterfoil, affiliated multimode cavity comprises that annulus loads counterfoil (1011), microstrip transmission line (1012), straight-flanked ring loads counterfoil (1013) and open circuit loads counterfoil (1014).[0007] described two trap UWB filters that trap is adjustable and passband is adjustable, is characterized in that, have the microstrip structure (103) of two counterfoils (1031) (1032) of opening a way, and produce trap characteristic and trap is adjustable; And the width of the each counterfoil broadside of microstrip line of open circuit counterfoil equates, and each broadside equates with the gap of straight-flanked ring.
Two trap UWB filters that described trap is adjustable and passband is adjustable, is characterized in that, have the microstrip structure (103) of two open circuit counterfoils (1031) (1032), produce trap characteristic; By the adjusting counterfoil length of opening a way, realize trap adjustable; And the width of the each counterfoil broadside of microstrip line of open circuit counterfoil equates, and each broadside equates with the gap of straight-flanked ring.
Two trap UWB filters that described trap is adjustable and passband is adjustable, it is characterized in that, multimode cavity load counterfoil (1011), microstrip transmission line (1012) and straight-flanked ring loading counterfoil (1013) by annulus, open a way and load counterfoil (1014) formation, load the radius of counterfoil (1011) and the ultra broadband of transmission line (1012) length and width generation 3.1-10.6GHz by adjusting annulus.
Two trap UWB filters that described trap is adjustable and passband is adjustable, is characterized in that, the adjustment of above-mentioned annular radii and transmission line length and width, in the situation that adjusting free transmission range, does not affect trap frequency; The adjustment of microstrip line counterfoil length, does not affect free transmission range yet, can realize passband adjustable with the adjustable non-interfering characteristic of trap, realize the compatibility of ultra-wideband communications and narrow-band communication system.
This invention filter has following characteristic and advantage with respect to existing filter:
Simplicity of design, compact conformation, easy to process, with low cost, passband is adjustable, trap is adjustable.
By adjust multimode resonator (101) size, can regulate passband at UWB(3.1-10.6GHz) scope.
Length by adjustment with open circuit counterfoil microstrip line construction (103), can realize trap adjustable.
Passband is adjustable not to be interfere with each other with trap is adjustable.
Accompanying drawing explanation
Fig. 1 is the basic structure end view of the invention process example 1;
Fig. 2 is the basic structure vertical view of the invention process example 1;
Fig. 3 is the multimode cavity structure chart of the invention process example 1;
Fig. 4 is the open circuit counterfoil microstrip line construction figure of the invention process example 1;
Fig. 5 is the equivalent mode of the invention process example 1;
Embodiment
The present invention has designed two trap UWB filters, and this filter trap is adjustable, passband is adjustable, and both adjustment are not interfere with each other.
Below in conjunction with accompanying drawing distance, invention is described in more detail:
As shown in Figure 2, medium substrate (104) is that dielectric constant is 10.2 RT/Duroid 6010 to an example of the present invention.The thickness of this medium substrate is 1.27mm, and dielectric loss tangent angle is 0.0023.Metal ground plate (105) under medium substrate adopts copper product.
As shown in Figure 1, two trap UWB filtering that trap of the present invention is adjustable and passband is adjustable, the multimode cavity (101) on medium substrate, microstrip structure (103), the combined transmission coupling line (102) of open circuit counterfoil, adopt copper product.
As shown in Figure 3, two trap UWB filters that trap of the present invention is adjustable and passband is adjustable, its multimode cavity comprises that annulus loads counterfoil (1011), microstrip transmission line (1012) and straight-flanked ring and loads counterfoil (1013), open circuit loads counterfoil (1014), realizes broadband character by multimode cavity.
As shown in Figure 4, the UWB filter of the two trap characteristics of the present invention adopts the microstrip structure of two open counterfoils (1031) (1032) to realize two trap characteristics.
The design parameter of the UWB filter of the two trap characteristics of this invention:
The selection of medium substrate: the RT/Duroid 6010 that dielectric constant is 10.2.The dielectric constant of general medium substrate is between 2--9.8, and the present invention adopts 10.2 substrate,, high dielectric constant makes the guide wavelength of signal less, and it is less that circuit can do.The dielectric loss tangent angle of substrate is 0.0023, has guaranteed that loss is less.The thickness of this medium substrate is that 1.27mm meets required intensity.
Metal ground plate under multimode cavity and medium substrate on medium substrate all adopts copper product.
The design of multimode resonator: according to filter correlation theory, design meets the circular ring structure resonant element of ultra-wideband communications.By adjusting annular radii and transmission line length and width, adjust bandwidth and cut-off frequency, make related filter meet UWB demand.
Open counterfoil microstrip design: according to micro-band transmission theory, calculate resonance frequency, thereby design the dimension of microstrip line with two open counterfoils, produce trap characteristic, the signal at elimination resonance frequency place, thereby inhibition zone external signal.
Claims (5)
1. two trap UWB filters that novel trap is adjustable and passband is adjustable, it is characterized in that, comprise and be formed at the multimode cavity (101) of dielectric-slab upper surface, microstrip structure (103), the combined transmission coupling line (102) of open circuit counterfoil, affiliated multimode cavity comprises that annulus loads counterfoil (1011), microstrip transmission line (1012), straight-flanked ring loads counterfoil (1013) and open circuit loads counterfoil (1014).
2. two trap UWB filters that trap according to claim 1 is adjustable and passband is adjustable, is characterized in that, have the microstrip structure (103) of two open circuit counterfoils (1031), (1032), produce trap characteristic; By the adjusting counterfoil length of opening a way, realize trap adjustable; And the width of the each counterfoil broadside of microstrip line of open circuit counterfoil equates, and each broadside equates with the gap of straight-flanked ring.
3. two trap UWB filters that trap according to claim 1 is adjustable and passband is adjustable, is characterized in that, combined transmission coupling line (102) is open circuit toe structure, and the gap between the width of every toe and each toe equates.
4. two trap UWB filters that trap according to claim 1 and 2 is adjustable and passband is adjustable, it is characterized in that, multimode cavity load counterfoil (1011), microstrip transmission line (1012) and straight-flanked ring loading counterfoil (1013) by annulus, open a way and load counterfoil (1014) formation, load the radius of counterfoil (1011) and the ultra broadband of transmission line (1012) length and width generation 3.1-10.6GHz by adjusting annulus.
5. and two trap UWB filters that passband adjustable adjustable according to the trap described in claim 2 or 4, is characterized in that, the adjustment of above-mentioned annular radii and transmission line length and width, in the situation that adjusting free transmission range, does not affect trap frequency; The adjustment of microstrip line counterfoil length, does not affect free transmission range yet, can realize passband adjustable with the adjustable non-interfering characteristic of trap, realize the compatibility of ultra-wideband communications and narrow-band communication system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504523.0A CN103855449A (en) | 2012-11-30 | 2012-11-30 | Double-trap-wave UWB filter with adjustable trap wave and adjustable passband |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504523.0A CN103855449A (en) | 2012-11-30 | 2012-11-30 | Double-trap-wave UWB filter with adjustable trap wave and adjustable passband |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103855449A true CN103855449A (en) | 2014-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210504523.0A Pending CN103855449A (en) | 2012-11-30 | 2012-11-30 | Double-trap-wave UWB filter with adjustable trap wave and adjustable passband |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103855449A (en) |
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2012
- 2012-11-30 CN CN201210504523.0A patent/CN103855449A/en active Pending
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140611 |