CN201829593U - Microstrip folded line open loop coupled double-mode band-pass filter - Google Patents
Microstrip folded line open loop coupled double-mode band-pass filter Download PDFInfo
- Publication number
- CN201829593U CN201829593U CN2010202712099U CN201020271209U CN201829593U CN 201829593 U CN201829593 U CN 201829593U CN 2010202712099 U CN2010202712099 U CN 2010202712099U CN 201020271209 U CN201020271209 U CN 201020271209U CN 201829593 U CN201829593 U CN 201829593U
- Authority
- CN
- China
- Prior art keywords
- filter
- mode
- line open
- open loop
- pass filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a microstrip folded line open loop coupled double-mode band-pass filter, comprising an input feed line, an output feed line and two opposite double-mode couplers, wherein the input feed line and the output feed line perform feeding in a central symmetrical way or other feeding ways; each double-mode coupler consists of a folded line open loop and a short circuit branch connected to the symmetrical mid-point of the coupler; the length of the folded line open loop is equal to the half wave length of the center frequency of the filter; the bandwidth of the filter can be regulated to a desired bandwidth by properly regulating the length of the short circuit branch; and the two opposite double-mode couplers have the same physical size and are coupled with each other by electric field coupling. Compared with the prior art, the filter can effectively restrain second harmonic spurious passband, so that band-gap bandwidth of the filter is increased.
Description
Technical field
The utility model belongs to the technical field of microwave microstrip filter, relates in particular to a kind of open circuit loop coupling bimodule band-pass filter.
Background technology
Filter is the core devices in radio frequency and the microwave system.In recent years, the rise of wireless communication technology is to the demands for higher performance of filter at aspects such as miniaturization, lightweight, low costs.
The little band broken line of tradition shown in Figure 1 open circuit loop coupling single mode band pass filter comprises incoming feeder 11, output feeder 21, two opposed monomode couplers 12 and 22.Be illustrated in figure 2 as traditional little band broken line open circuit loop coupling single mode band pass filter frequency response chart.As can be seen from Figure 2 should tradition little band broken line open circuit loop coupling single mode band pass filter attenuation outside a channel is less, particularly has parasitic passband at the second harmonic place.
People such as Hong J-S have proposed a kind of little band broken line open circuit loop coupling single mode band pass filter (J.-S.Hong and M.J.Lancaster in 1996, " Compact microwave elliptic function filter usingnovel microstrip meander open-loop resonators; " Electronics Letters, 32,1996, pp.563-564.), this filter has advantages such as area is little, cost of manufacture is low.But this filter attenuation outside a channel is less, particularly has parasitic passband at the second harmonic place.
Summary of the invention
The utility model proposes a kind of microstrip meander line open loop coupling dual-mode band-pass filter at the deficiencies in the prior art, and this filter can effectively suppress the second harmonic parasitic passband.
The utility model adopts following technical scheme:
A kind of microstrip meander line open loop coupling dual-mode band-pass filter comprises incoming feeder, output feeder and two opposed dual-mode couplers.
Described incoming feeder, output feeder are 50 Ω characteristic line breadths, adopt center symmetric mode feed, also can adopt other feeding classifications.
Described dual-mode couplers is made of the short circuit minor matters that the broken line open circuit encircled and be connected in its symmetrical mid point.
Described broken line open circuit ring is 50 Ω characteristic line breadths, and length is the half-wavelength of the utility model filter center frequency.
Described short circuit minor matters are 50 Ω characteristic line breadths, and the length of suitable described adjusting short circuit minor matters can be adjusted to expected bandwidth with filter.
Described two opposed dual-mode couplers have identical physical size, adopt the mode of field coupled to intercouple.
Compared with prior art, the utility model filter can effectively suppress the second harmonic parasitic passband, makes filter forbidden band bandwidth be increased.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is traditional little band broken line open circuit loop coupling single mode bandpass filter structures schematic layout pattern.
Fig. 2 is traditional little band broken line open circuit loop coupling single mode band pass filter frequency response chart.
Fig. 3 is the utility model microstrip meander line open loop coupling dual-mode band-pass filter topology layout schematic diagram.
Fig. 4 is the utility model microstrip meander line open loop coupling dual-mode band-pass filter frequency response chart.
Embodiment
The microstrip meander line open loop coupling dual-mode band-pass filter embodiment of the utility model design and being described in detail as follows, it is 6.15 that shown embodiment is produced on dielectric constant, and thickness is on the microwave substrate of 0.64mm, and the centre frequency of band pass filter is 1.09GHz.
As shown in Figure 3, the microstrip meander line open loop coupling dual-mode band-pass filter of the utility model design comprises incoming feeder 31, output feeder 41 and two opposed dual- mode couplers 32 and 42.
Incoming feeder 31, output feeder 41 live widths are 0.94mm, and its characteristic line breadth is 50 Ω, adopt center symmetric mode feed, also can adopt other feeding classifications.
Dual-mode couplers 32 is made of with the short circuit minor matters 322 that are connected in its symmetrical mid point broken line open circuit ring 321.
The live width of broken line open circuit ring 321 is 0.94mm, and its characteristic line breadth is 50 Ω, and length is the half-wavelength of the utility model filter center frequency.
The live width of short circuit minor matters 322 is 0.94mm, and its characteristic line breadth is 50 Ω, the preferred 0.5mm of length, and the length of suitably regulating short circuit minor matters 322 can be adjusted to expected bandwidth with filter.
Dual-mode couplers 42 is made of with the short circuit minor matters 422 that are connected in its symmetrical mid point broken line open circuit ring 421.
Dual-mode couplers 42 has identical structure and physical size with dual-mode couplers 32, and the two adopts the mode of field coupled to intercouple.
Because short circuit minor matters 322 and 422 existence, coupler 32 and 42 be a dual-mode couplers, thereby the filter that the utility model is realized is four-step filter, and traditional little band broken line shown in Figure 1 loop coupling single mode band pass filter of opening a way is a second order filter.
Fig. 4 has shown the frequency response chart of the utility model microstrip meander line open loop coupling dual-mode band-pass filter emulation, compare and to find with the frequency response chart of traditional little band broken line open circuit loop coupling single mode band pass filter shown in Figure 2 emulation: traditional little band broken line open circuit loop coupling single mode band pass filter, at the second harmonic place, because the influence of ghost effect, harmonic wave inhibition degree about 2dB is only arranged, can not satisfy requirement of actual application far away, and the utility model filter is decayed in the frequency band from 1.5GHz to 3GHz in the forbidden band all greater than 26dB, has improved the forbidden decay degree of 24dB.
The above, it only is preferable embodiment of the present utility model, be not that the utility model is done any pro forma restriction, any content that does not break away from technical solutions of the utility model, according to any simple modification, equivalent variations and the modification that technical spirit of the present utility model is done above embodiment, all belong to the scope of technical solutions of the utility model.
Claims (1)
1. a microstrip meander line open loop coupling dual-mode band-pass filter comprises incoming feeder, output feeder and two opposed dual-mode couplers, and its feature comprises:
Described dual-mode couplers is made of the short circuit minor matters that the broken line open circuit encircled and be connected in its symmetrical mid point;
Described broken line open circuit ring length is the half-wavelength of described microstrip meander line open loop coupling dual-mode band-pass filter centre frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202712099U CN201829593U (en) | 2010-07-26 | 2010-07-26 | Microstrip folded line open loop coupled double-mode band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202712099U CN201829593U (en) | 2010-07-26 | 2010-07-26 | Microstrip folded line open loop coupled double-mode band-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201829593U true CN201829593U (en) | 2011-05-11 |
Family
ID=43968111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202712099U Expired - Fee Related CN201829593U (en) | 2010-07-26 | 2010-07-26 | Microstrip folded line open loop coupled double-mode band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201829593U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637931A (en) * | 2012-04-18 | 2012-08-15 | 南通大学 | Microwave three-passband bandpass filter |
| CN103022600A (en) * | 2012-12-24 | 2013-04-03 | 中国计量学院 | Symmetric ring twisted-pair-shaped terahertz wave filter |
| CN108258372A (en) * | 2018-01-15 | 2018-07-06 | 绍兴文理学院 | The method and comb filter of independent regulation and control comb filter frequency and bandwidth |
-
2010
- 2010-07-26 CN CN2010202712099U patent/CN201829593U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637931A (en) * | 2012-04-18 | 2012-08-15 | 南通大学 | Microwave three-passband bandpass filter |
| CN103022600A (en) * | 2012-12-24 | 2013-04-03 | 中国计量学院 | Symmetric ring twisted-pair-shaped terahertz wave filter |
| CN108258372A (en) * | 2018-01-15 | 2018-07-06 | 绍兴文理学院 | The method and comb filter of independent regulation and control comb filter frequency and bandwidth |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204130667U (en) | A kind of half module substrate integrated wave guide two band filter | |
| CN103700910B (en) | The two band filter of a kind of complementary openings resonant ring and defect ground structure half module substrate integrated wave guide | |
| CN201528031U (en) | L-type coupled-structure dual-mode microstrip bandpass filter | |
| CN102509821A (en) | Dual-mode bi-pass filter based on capacitance loading square resonant rings | |
| CN103367844A (en) | Multi-branch loading-based three passband high-temperature superconductive filter | |
| CN101667671B (en) | Microstrip dual-mode filter with features of wide stop band and low spurious | |
| CN103367843B (en) | Four-model resonator-based compact dual-passband high-temperature superconductive filter | |
| CN201829593U (en) | Microstrip folded line open loop coupled double-mode band-pass filter | |
| CN103187600B (en) | Dual-mode three-way wide-band filter based on multi-branch loaded square resonance ring | |
| CN103579722B (en) | Dual frequency filter | |
| CN108879043B (en) | Three-mode balance filter adopting coupling branch loading slot line resonance structure | |
| CN208385587U (en) | A kind of small-sized three band-pass filter with eight transmission zeros | |
| CN102664295B (en) | Ultra-wideband micro-strip bandpass filter | |
| CN206274545U (en) | A kind of PCB antenna based on resonator | |
| CN103490123B (en) | plane bandpass filter | |
| CN208478527U (en) | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure | |
| CN104320101A (en) | Antenna self-adaptation control matching circuit | |
| CN101894992A (en) | Microstrip meander line open loop coupling dual-mode band-pass filter | |
| CN204206139U (en) | A kind of negative group delay circuitry | |
| CN201725859U (en) | Open-loop coupling bandpass filter based on micro-strip interdigital capacitor | |
| CN202058840U (en) | Triangular open loop coupling band-pass filter | |
| CN103337679A (en) | Three-passband high-temperature superconductor (HTS) filter based on T-shaped branch loading stepped impedance resonator | |
| CN110534852A (en) | Multifrequency band-pass filter based on in-parallel coupling splitted construction multimode resonator | |
| CN104143971A (en) | Negative group delay circuit | |
| CN205828610U (en) | A kind of miniaturization cavity duplexer being applied to digital high-frequency amplification station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20130726 |