CN202308232U - Microwave filter with double frequency bands - Google Patents
Microwave filter with double frequency bands Download PDFInfo
- Publication number
- CN202308232U CN202308232U CN2011204030756U CN201120403075U CN202308232U CN 202308232 U CN202308232 U CN 202308232U CN 2011204030756 U CN2011204030756 U CN 2011204030756U CN 201120403075 U CN201120403075 U CN 201120403075U CN 202308232 U CN202308232 U CN 202308232U
- Authority
- CN
- China
- Prior art keywords
- filter
- metal
- double frequency
- metal patch
- microwave 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
- 239000002184 metal Substances 0.000 claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 description 16
- 230000009977 dual effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a microwave filter with double frequency bands. The microwave filter comprises a medium substrate, a first metal paster and a second metal paster, wherein the two pasters respectively cover the upper surface and the lower surface of the medium substrate; the first metal paster comprises a sheet metal (6), an input port (4) and an output port (5); two short circuit sections are loaded on a stepped impedance line of the sheet metal (6), and two metalized through holes (9) are arranged at the tail ends of the two short circuit sections; and the second metal paster is provided with metalized through holes corresponding to the first metal paster, and the first metal paster is connected with the second metal paster by the metalized through holes. In the microwave filter disclosed by the utility model, two short circuit sections are loaded on the stepped impedance line, and a source is added at the input end and the output end and is coupled with a load, and therefore, one filter with double frequency bands is realized with one resonator, and the filter has the characteristics of being compact in structure, low in cost and high in performance.
Description
Technical field
The utility model relates to the stepped impedance double frequency-band microwave filter that a kind of short circuit minor matters load, and belongs to the design field of millimeter wave and microwave device.
Background technology
Microwave filter is widely used in the systems such as microwave communication, radar navigation, electronic countermeasures, missile guidance, test instrumentation, is indispensable device in microwave and the millimeter-wave systems, and the quality of its performance tends to directly influence the performance of whole communication system
[1]
The one-segment communication system has seemed outmoded in the advanced information society, can not satisfy the demand of radio communication well.Along with the fast development of wireless communication technology, the one-segment communication system more and more demonstrates its limitation.Particularly wireless lan (wlan) The Application of Technology and development promoted many scientific research institutions and scholar then has been engaged in double frequency-band and the research of multiband communication system related fields.
In order to make full use of existing frequency spectrum and infrastructure device resource, in communication system, be provided with a plurality of communications bands that can work simultaneously, one of effective way is exactly to research and develop high performance double frequency-band microwave filter.Filter is as one of indispensable Primary Component in the modern communications equipment; It is various unwanted signals of filtering and noise signal effectively; The signal that reduces between each communication channel disturbs; Thereby ensure the operate as normal of communication equipment, realize high-quality communication, and then reach effective utilization of frequency spectrum resource.The fast development of modern communications need effectively utilize increasing frequency channels, and in order to reduce telecommunication circuit equipment volume and weight, the research of double frequency-band device more and more draws attention.Therefore, the research to dual frequency filter has great importance and practical value.
The conventional design method of dual frequency filter mainly contains in the radio communication:
1. filter cascade
[2]: a band pass filter and a band stop filter are carried out cascade, realize the double frequency effect through regulating, but will increase the volume and the supplementary load loss of filter.
2. coupled resonance filter
[3] [4]: through with two shared same input/output terminal effected dual frequency filters of resonator, each resonator independent regulation is passband separately, but this structure is too complicated.
3. stepped impedance filter
[5]: utilize the parasitic passband of coupled resonance filter to realize double frequency filter.The resonance frequency of stepped impedance can be regulated through the reactance ratio and the electrical length that change stepped impedance.Easy to adjust, compact conformation, but the performance of filter still needs to improve.
List of references:
[1] Gan Ben pulls out, Wu Wanchun. the structure of modern microwave filter and design. and Beijing: Science Press, 1974.
[2]Tsai,?L.-C.,?and?Huse,?C.-W.:?‘Dual-band?bandpasslters?using?equal-length?coupled-serial-shunted?lines?and?Z-transform?techniques’,?
IEEE?Trans.?Microw.?Theory?Tech.,?2004,?52,?(4),?pp.?1111–1117。
[3]?Jung-Woo?Baik,?Lei?Zhu?and?Young-Sik?Kim:?‘Dual-Mode?Dual-Band?Bandpass?Filter?Using?Balun?Structure?for?Single?Substrate?Con?guration’,?
IEEE?Microwave?and?Wireless?Components?Letters,?2010,?20(1),?pp.613-615。
[4]?Hong-wei?Deng,?Yong-jiu?Zhao,?Lu?Zhang,?Xue-shun?Zhang,?Wei?Zhao,?A?Dual-Band?BPF?with?DSIR?and?TSIR.?
Electronics?Letters.?2010,?46(17),?pp.?1205-1206。
[5]Chu,?Q.-X.,?and?Chen,?F.-C.:‘A?compact?dual-band?bandpasslter?using?meandering?stepped?impedance?resonators’,?
IEEE?Microwave?and?Wireless?Components?Letters,?2008,?18,?(5),?pp.?320–322。
Summary of the invention
The utility model technical problem to be solved is for realizing the miniaturization of filter construction, improve performance of filter, cut down finished cost, the stepped impedance double frequency-band microwave filter that provides a kind of short circuit minor matters that relate to millimeter wave and microwave device to load.
The utility model adopts following technical scheme for solving the problems of the technologies described above:
A kind of double frequency-band microwave filter; Comprise dielectric substrate, first metal patch, second metal patch; Said two metal patches are coated on the upper and lower surface of dielectric substrate respectively; Said first metal patch comprises sheet metal, input port and output port, and said sheet metal is made up of the short branch that loads two sections symmetries on the stepped impedance line of one section symmetric curvature, is respectively arranged with two plated-through holes at the two ends of two sections short branch;
Said second metal patch is provided with and the corresponding plated-through hole of first metal patch, and said first metal patch is connected through plated-through hole with second metal patch.
Further, a kind of double frequency-band microwave filter of the utility model, input port and output port all adopt the L type microstrip structure that the external symmetry of 50 ohm microstrip is placed.
Further, a kind of double frequency-band microwave filter of the utility model, said two sections short branch are arranged at the two ends of middle shaft part of the stepped impedance line of symmetric curvature respectively.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
1, high-performance; The L type microstrip structure that the input port of this filter and output port all adopt the external symmetry of 50 ohm microstrip to place; Thereby realize capacitive source and load coupling; And two short circuit minor matters on stepped impedance, have been loaded; Make around two passbands, to have produced 5 transmission zeros, strengthened the outer inhibition of band, improved performance of filter.
2, low cost; This filter construction only adds upper and lower double layer of metal coating by the single-layer medium plate and two through holes constitute; So can adopt very ripe at present single-layer printed circuit plate (PCB) production technology produces; Add the characteristics of its miniaturization; Whole board dimension is littler, and processing cost is very cheap.
3, size is little; What this structure was used when realizing dual frequency filter is step electric impedance resonator; Filter based on step electric impedance resonator has compact conformation; The advantage that size is little, and the utility model only used a resonator when realizing the double frequency passband, when satisfying same condition; Structure is concision and compact more, and size is littler.
4, design process is more succinctly convenient; This filter has loaded two short circuit minor matters and has realized that the frequency of two passbands can be passed through the stepped impedance simple adjustment between stepped impedance, use the analysis of odd even modulus method, greatly facilitates the design of filter band.
Description of drawings
Fig. 1 is the front view of the structure of the utility model.
Fig. 2 is the end view of the structure of the utility model.
Fig. 3 is the upward view of the structure of the utility model.
Fig. 4 is the filter transmission coefficient S of the utility model
21Correlation curve figure.
Fig. 5 is the filter reflection coefficient S of the utility model
11Correlation curve figure.
Label is explained in the accompanying drawing: 1-dielectric substrate, 2-second metal patch, 3-first metal patch, 4-input port, 5-output port, 6-sheet metal, 7-stepped impedance line, 8-short branch, 9-plated-through hole.
Embodiment
Below in conjunction with accompanying drawing the technical scheme of the utility model is done further detailed description:
As shown in Figure 1; First metal patch 3 of the dual frequency filter of the utility model; Form by sheet metal 6, input port 4 and output port 5; Wherein sheet metal 6 is made up of two sections short branch 8 of symmetry loading on one section stepped impedance line 7, is respectively arranged with two plated-through holes 9 at the two ends of two sections short branch 8.For reducing volume, stepped impedance line symmetric curvature.
As the preferred enforcement of the utility model, input port 4 all adopts the external symmetrical L type microstrip structure of placing of 50 ohm microstrip with output port 5.Two sections short branch are arranged at the two ends of middle shaft part of the stepped impedance line of symmetric curvature respectively
As shown in Figure 2, the structure of the dual frequency filter of the utility model comprises that dielectric substrate 1, first metal patch 3,2, two metal patches of second metal patch are coated on the two sides of dielectric substrate respectively.
As shown in Figure 3, corresponding with first metal patch, two plated-through hole also is set above second metal patch, first metal patch is connected through plated-through hole with second metal patch.
The course of work of the filter of the utility model when communication is following: signal carries out feed through 4 pairs of sheet metals of input port 6, at last by output port 5 outputs.This resonator can produce four modes of resonance in free transmission range, preceding two patterns constitute first passband, and latter two produces second passband, and can be by the convenient adjusting of the different size parameter of resonator.When in addition suitable source and load coupling, only use a resonator can constitute the double frequency-band microwave filter.
Like Fig. 4 and shown in Figure 5, show emulation and the test data contrast of transmission curve in working band.Two frequency bands lay respectively at 1.57GHz and 5.35GHz, and in-band insertion loss is at 0.5 decibel ± 0.1 decibel, and return loss is all below 18 decibels; What test and emulation coincide simultaneously is fine.
Claims (3)
1. double frequency-band microwave filter; Comprise dielectric substrate, first metal patch, second metal patch; Said two metal patches are coated on the upper and lower surface of dielectric substrate respectively; It is characterized in that: said first metal patch comprises sheet metal, input port and output port, and said sheet metal is made up of the short branch that loads two sections symmetries on the stepped impedance line of one section symmetric curvature, is respectively arranged with two plated-through holes at the two ends of two sections short branch;
Said second metal patch is provided with and the corresponding plated-through hole of first metal patch, and said first metal patch is connected through plated-through hole with second metal patch.
2. a kind of double frequency-band microwave filter according to claim 1 is characterized in that: the L type microstrip structure that input port and output port all adopt the external symmetry of 50 ohm microstrip to place.
3. a kind of double frequency-band microwave filter according to claim 1 is characterized in that: said two sections short branch are arranged at the two ends of middle shaft part of the stepped impedance line of symmetric curvature respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204030756U CN202308232U (en) | 2011-10-21 | 2011-10-21 | Microwave filter with double frequency bands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204030756U CN202308232U (en) | 2011-10-21 | 2011-10-21 | Microwave filter with double frequency bands |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202308232U true CN202308232U (en) | 2012-07-04 |
Family
ID=46377060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204030756U Expired - Fee Related CN202308232U (en) | 2011-10-21 | 2011-10-21 | Microwave filter with double frequency bands |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202308232U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018171231A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band band-pass filter based on open loads and short-circuit loads |
| CN109980327A (en) * | 2019-04-15 | 2019-07-05 | 南京航空航天大学 | It is a kind of with highly selective and constant bandwidth adjustable bimodule band-pass filter |
-
2011
- 2011-10-21 CN CN2011204030756U patent/CN202308232U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018171231A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band band-pass filter based on open loads and short-circuit loads |
| CN109980327A (en) * | 2019-04-15 | 2019-07-05 | 南京航空航天大学 | It is a kind of with highly selective and constant bandwidth adjustable bimodule band-pass filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110034361B (en) | Miniaturized ultra-wideband filtering power division feed network for 5G communication and design method thereof | |
| Zhang et al. | Planar tri-band bandpass filter with compact size | |
| CN102361110B (en) | Small-sized double-module double-frequency micro-strip filter | |
| CN101976754B (en) | Tri-band Wilkinson power distributor | |
| CN102610879B (en) | Double-frequency band-pass filter | |
| CN105762465A (en) | Miniaturized ultra wide band filter with two-notch features | |
| CN204130667U (en) | A kind of half module substrate integrated wave guide two band filter | |
| CN112332054B (en) | Dual-passband band-pass filter based on asymmetric coupling line | |
| CN101958442B (en) | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure | |
| CN103904391B (en) | Multilayer hybrid guided mode hexagon substrate integral wave guide filter | |
| CN101320840B (en) | Multi-stop band ultra-wideband antenna based on miniaturization double module resonator | |
| CN102361112A (en) | Dual-band microwave filter | |
| CN104124496A (en) | Microstrip tri-band bandpass filter | |
| CN107732399A (en) | A kind of frequency four-port microstrip combiner of ultra wide band three for mobile radio system | |
| KR102289944B1 (en) | Composite L-Type TL for Spurious Band Suppression in Dual Band Power Divider | |
| CN208385587U (en) | A kind of small-sized three band-pass filter with eight transmission zeros | |
| CN202308232U (en) | Microwave filter with double frequency bands | |
| CN207409639U (en) | A kind of three frequency four-port microstrip combiner of ultra wide band for mobile radio system | |
| CN202434677U (en) | High pass filter | |
| CN202523822U (en) | Double-frequency band pass filter | |
| CN106876855A (en) | A kind of Mini Microstrip broadband work(clutch | |
| CN113224483A (en) | Three-passband filter based on SLR structure | |
| CN202076392U (en) | Ultra wideband filter | |
| CN101764276A (en) | Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure | |
| CN201188454Y (en) | Implementation of multi-frequency interference resistance ultra-wideband antenna using double frequency characteristics of ladder impedance resonator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20161021 |