CN111029694A - Microstrip filter - Google Patents
Microstrip filter Download PDFInfo
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- CN111029694A CN111029694A CN201911251218.3A CN201911251218A CN111029694A CN 111029694 A CN111029694 A CN 111029694A CN 201911251218 A CN201911251218 A CN 201911251218A CN 111029694 A CN111029694 A CN 111029694A
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- transmission line
- substrate
- microstrip filter
- resonance
- grounding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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Abstract
The invention relates to the technical field of communication, in particular to a microstrip filter. The microstrip filter comprises a substrate, and a transmission line, a grounding piece and at least two resonance units which are arranged on the substrate, wherein the transmission line is used for transmitting signals, the resonance units are arranged in parallel, one end of each resonance unit is electrically connected with the grounding piece, and the other end of each resonance unit is electrically connected with the transmission line. The microstrip filter has the advantages of low loss and wide bandwidth.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of communication, in particular to a microstrip filter.
[ background of the invention ]
With the continuous development of society, the functions of mobile terminals are increasing, and the mobile terminals include antenna modules, so that the environment of microstrip filters is more and more complicated, and the design of filters with miniaturization, low profile, low loss, low tolerance and broadband has become a challenge.
The microstrip filter is a low-profile filter structure, and the existing microstrip filter has the defects of large loss and the like in millimeter wave application, and the requirement of broadband operation is difficult to meet on a medium substrate with lower thickness.
Therefore, it is necessary to provide a microstrip filter with low loss and wide bandwidth to solve the above problems.
[ summary of the invention ]
The invention aims to provide a microstrip filter with low loss and wide bandwidth.
The technical scheme of the invention is as follows:
the invention provides a microstrip filter, which comprises a substrate, a transmission line, a grounding piece and at least two resonance units, wherein the transmission line, the grounding piece and the at least two resonance units are arranged on the substrate, the transmission line is used for transmitting signals, the resonance units are arranged in parallel, one end of each resonance unit is electrically connected with the grounding piece, and the other ends of every two adjacent resonance units are electrically connected through the transmission line.
Preferably, the resonance unit is vertically disposed with respect to the transmission line.
Preferably, the length of the resonance unit is one quarter of the wavelength length of the transmission line transmitting the signal.
Preferably, the resonance units are arranged at intervals.
Preferably, the resistance of the transmission line is 45-55 omega.
Preferably, the substrate has a thickness of less than 70 μm.
Preferably, when the number of the resonance units is greater than two, the distances between the resonance units are equal.
Preferably, the resonance unit includes three.
Preferably, the substrate includes first and second opposing surfaces, the transmission line and the resonant unit are disposed on the first surface of the substrate, and the ground is disposed on the second surface of the substrate.
Preferably, the substrate is provided with grounding holes, the number of the grounding holes is the same as that of the resonance units, the microstrip filter further comprises grounding posts, the grounding posts are located in the grounding holes, and each resonance unit is electrically connected with the grounding piece through one grounding post.
Compared with the prior art, the microstrip filter comprises a substrate, and a transmission line, a grounding piece and at least two resonance units which are arranged on the substrate, wherein the transmission line is used for transmitting signals, the resonance units are arranged in parallel, one end of each resonance unit is electrically connected with the grounding piece, the other ends of every two adjacent resonance units are electrically connected through the transmission line, the microstrip filter has good performance, can be suitable for the substrate with a thin thickness, has small insertion loss, wide relative bandwidth and low tolerance, and has wide application prospect in millimeter wave communication.
[ description of the drawings ]
Fig. 1 is a schematic perspective view of a microstrip filter according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of a microstrip filter according to an embodiment of the present invention.
Fig. 3 is an enlarged schematic view of a portion a in fig. 1.
Fig. 4 is a S characteristic parameter graph of the microstrip filter according to the embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and 2 together, the present invention provides a microstrip filter 10, the microstrip filter 10 includes a substrate 11, a transmission line 12 disposed on the substrate 11, a ground element 13, and at least two resonant units 14. The transmission line 12 is used for transmitting signals, the resonance units 14 are arranged in parallel, one end of each resonance unit 14 is electrically connected with the grounding piece 13, the other ends of every two adjacent resonance units 14 are electrically connected through the transmission line 12, and each resonance unit 14 is electrically connected with the grounding piece 13. The grounding member 13 is grounded, and the resonance unit 14 can filter the signal transmitted on the transmission line 12 when the signal is transmitted on the transmission line 12.
The substrate 11 may be a Printed Circuit Board (PCB) substrate 11. The microstrip filter 10 of the present invention can meet the bandwidth requirement even when the substrate 11 is thin. Specifically, the thickness of the substrate 11 is less than 70 μm, for example, the thickness of the substrate 11 may be 60 μm. The substrate 11 includes a first surface and a second surface that are oppositely disposed. The transmission line 12, the ground 13, and the at least two resonance units 14 are disposed on both surfaces of the substrate 11. Specifically, the transmission line 12 and the resonant unit 14 are disposed on a first surface of the substrate 11, and the ground 13 is disposed on a second surface of the substrate 11. The substrate 11 is provided with ground holes 111 in the same number as the resonant cells 14. It is understood that the transmission line 12, the grounding member 13, and the at least two resonant units 14 may also be disposed on the same surface of the substrate 11, such as all disposed on the first surface of the substrate 11, and in this case, the substrate 11 may not be provided with the grounding hole 111.
Referring to fig. 3, the transmission line 12 includes an input end 121 and an output end 122 opposite to each other. The input terminal 121 is used for inputting signals, and the output terminal 122 is used for outputting signals. Preferably, the transmission line 12 is linear. The transmission line 12 may be a copper line, which has a good transmission performance. The transmission line 12 has a resistance of 45 to 55 Ω, preferably 50 Ω. The length of the transmission line 12 is not limited, and the coupling strength between the resonant units 14 can be adjusted by changing the length of the transmission line 12.
The ground 13 is used for grounding. The material of the ground piece 13 is preferably copper. The grounding member 13 may be shaped as a plate, i.e. the grounding member 13 is a grounding plate.
The resonance unit 14 is a wire capable of transmitting signals, and specifically, the resonance unit 14 is a short-circuit wire, that is, the resonance unit 14 is grounded through the grounding member 13. Each resonant element 14 is substantially perpendicular to the transmission line 12, specifically, the angle b between the resonant element 14 and the transmission line 12 is 85 ° to 95 °, and preferably, the resonant elements 14 are perpendicular to the transmission line 12. The resonant cells 14 are spaced apart. When the number of the resonance units 14 is greater than two, the distances L1 between the resonance units 14 are equal. The distance L1 between two adjacent resonant cells 14 is not limited, that is, the length of the transmission line 12 between two adjacent resonant cells 14 is not limited, and the coupling strength between two adjacent resonant cells 14 can be adjusted by controlling the length of the transmission line 12 connected therebetween. The length L2 of the resonant cell 14 is one quarter of the wavelength length of the transmission line 12 transmitting the signal. When the resonant unit 14 is electrically connected to the transmission line 12, the end of the resonant unit 14 is electrically connected to the transmission line 12. The microstrip filter 10 may further include ground studs (not shown) in accordance with the number of the resonant units 14, each ground stud is located in one of the ground holes 111, the ground studs are electrically conductive, and each resonant unit 14 is electrically connected to the ground member 13 through one of the ground studs.
The number of the resonance units 14 is at least two, and in the present invention, three resonance units 14 are exemplified. The resonance unit 14 specifically includes a first resonance unit 141, a second resonance unit 142, and a third resonance unit 143.
The first resonant cell 141 is perpendicular with respect to the transmission line 12. The length of the first resonance unit 141 is a quarter of the wavelength length of the transmission line 12 transmitting the signal. The first resonance unit 141 includes opposite first and second ends. A first end of the first resonant unit 141 is electrically connected to the transmission line 12, and a second end of the second resonant unit 142 is electrically connected to the ground 13. Specifically, the second end of the second resonant unit 142 is electrically connected to the ground member 13 through a ground post.
The second resonator element 142 is perpendicular with respect to the transmission line 12. The length of the second resonance unit 142 is one quarter of the wavelength length of the transmission line 12 transmitting the signal. The second resonant cell 142 includes third and fourth opposing terminals. The third terminal of the second resonant unit 142 is electrically connected to the transmission line 12, and the fourth terminal of the second resonant unit 142 is electrically connected to the ground 13. Specifically, the fourth terminal of the second resonant unit 142 is electrically connected to the ground member 13 through a ground post.
The third resonant cell 143 is perpendicular with respect to the transmission line 12. The length of the third resonance unit 143 is a quarter of the wavelength length of the transmission line 12 transmitting the signal. The third resonance unit 143 includes opposite fifth and sixth ends. The fifth end of the third resonant unit 143 is electrically connected to the transmission line 12, and the sixth end of the third resonant unit 143 is electrically connected to the ground 13. Specifically, the sixth end of the third resonant unit 143 is electrically connected to the ground member 13 through a ground post. The distance between the first resonance unit 141 and the second resonance unit 142 is equal to the distance between the second resonance unit 142 and the third resonance unit 143.
As shown in fig. 4, S11 is the port reflection coefficient of the microstrip filter 10 of the present invention, and S21 is the transmission coefficient, when the substrate of the microstrip filter 10 of the present invention is thin, the performance of the microstrip filter 10 is good, for example, when the thickness of the substrate 11 is 60 μm, the center frequency of the microstrip filter 10 is 30.5GHz, the relative bandwidth is 45.9%, the insertion loss is less than 0.6dB, and the microstrip filter 10 meets the requirement of a 5G millimeter wave communication system, and has a broad application prospect in millimeter wave communication.
Compared with the prior art, the microstrip filter comprises a substrate, and a transmission line, a grounding piece and at least two resonance units which are arranged on the substrate, wherein the transmission line is used for transmitting signals, the resonance units are arranged in parallel, one end of each resonance unit is electrically connected with the grounding piece, the other ends of every two adjacent resonance units are electrically connected through the transmission line, the microstrip filter has good performance, can be suitable for the substrate with a thin thickness, has small insertion loss, wide relative bandwidth and low tolerance, and has wide application prospect in millimeter wave communication.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A microstrip filter characterized by: the microstrip filter comprises a substrate, and a transmission line, a grounding piece and at least two resonance units which are arranged on the substrate, wherein the transmission line is used for transmitting signals, the resonance units are arranged in parallel, one end of each resonance unit is electrically connected with the grounding piece, and the other ends of the resonance units are electrically connected with the transmission line.
2. The microstrip filter of claim 1, wherein: the resonance unit is vertically disposed with respect to the transmission line.
3. The microstrip filter of claim 1, wherein: the length of the resonance unit is one quarter of the wavelength length of the transmission line for transmitting signals.
4. The microstrip filter of claim 1, wherein: the resonance units are arranged at intervals.
5. The microstrip filter of claim 1, wherein: the resistance of the transmission line is 45-55 omega.
6. The microstrip filter of claim 1, wherein: the thickness of the substrate is less than 70 μm.
7. The microstrip filter of claim 1, wherein: when the number of the resonance units is more than two, the distances between the resonance units are equal.
8. The microstrip filter of claim 7, wherein: the resonant unit includes three.
9. The microstrip filter of claim 1, wherein: the substrate comprises a first surface and a second surface which are opposite, the transmission line and the resonance unit are arranged on the first surface of the substrate, and the grounding piece is arranged on the second surface of the substrate.
10. The microstrip filter of claim 9, wherein: the microstrip filter comprises a substrate, resonance units and grounding columns, wherein the substrate is provided with grounding holes, the number of the grounding holes is the same as that of the resonance units, the grounding columns are positioned in the grounding holes, and each resonance unit is electrically connected with a grounding piece through one grounding column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251218.3A CN111029694A (en) | 2019-12-09 | 2019-12-09 | Microstrip filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251218.3A CN111029694A (en) | 2019-12-09 | 2019-12-09 | Microstrip filter |
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| CN111029694A true CN111029694A (en) | 2020-04-17 |
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| CN201911251218.3A Pending CN111029694A (en) | 2019-12-09 | 2019-12-09 | Microstrip filter |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901950A (en) * | 2010-07-05 | 2010-12-01 | 南京赛格微电子科技有限公司 | Broadband triple-band filter |
| CN102544653A (en) * | 2012-02-24 | 2012-07-04 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN204011616U (en) * | 2014-08-06 | 2014-12-10 | 成都信息工程学院 | Compact short-circuit line microstrip filter |
| CN104241749A (en) * | 2014-09-16 | 2014-12-24 | 电子科技大学 | Microstrip filter with controllable transmission zeros |
| CN106169635A (en) * | 2016-08-13 | 2016-11-30 | 南京理工大学 | A kind of pocket super-broadband band filter with trap characteristic |
| CN106887655A (en) * | 2017-01-19 | 2017-06-23 | 宁波大学 | A kind of quarter-wave short circuited stub microstrip filter |
| CN206806478U (en) * | 2017-03-30 | 2017-12-26 | 湖北大学 | It is a kind of to load T-shaped minor matters in parallel and the Microstrip Low-Pass of defect ground structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
| CN207743368U (en) * | 2017-12-29 | 2018-08-17 | 苏州富电通讯有限公司 | A kind of microstrip coupled dielectric filter |
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
| CN110247145A (en) * | 2019-06-26 | 2019-09-17 | 北京邮电大学 | It is a kind of with the adjustable wideband filtered balun of the bandwidth with interior matched well and isolation |
-
2019
- 2019-12-09 CN CN201911251218.3A patent/CN111029694A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901950A (en) * | 2010-07-05 | 2010-12-01 | 南京赛格微电子科技有限公司 | Broadband triple-band filter |
| CN102544653A (en) * | 2012-02-24 | 2012-07-04 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN204011616U (en) * | 2014-08-06 | 2014-12-10 | 成都信息工程学院 | Compact short-circuit line microstrip filter |
| CN104241749A (en) * | 2014-09-16 | 2014-12-24 | 电子科技大学 | Microstrip filter with controllable transmission zeros |
| CN106169635A (en) * | 2016-08-13 | 2016-11-30 | 南京理工大学 | A kind of pocket super-broadband band filter with trap characteristic |
| CN106887655A (en) * | 2017-01-19 | 2017-06-23 | 宁波大学 | A kind of quarter-wave short circuited stub microstrip filter |
| CN206806478U (en) * | 2017-03-30 | 2017-12-26 | 湖北大学 | It is a kind of to load T-shaped minor matters in parallel and the Microstrip Low-Pass of defect ground structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
| CN207743368U (en) * | 2017-12-29 | 2018-08-17 | 苏州富电通讯有限公司 | A kind of microstrip coupled dielectric filter |
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
| CN110247145A (en) * | 2019-06-26 | 2019-09-17 | 北京邮电大学 | It is a kind of with the adjustable wideband filtered balun of the bandwidth with interior matched well and isolation |
Non-Patent Citations (2)
| Title |
|---|
| MOHAMMAD SHAHRAZEL RAZALLI等: "Compact Configuration Ultra-Wideband Microwave Filter Using Quarter-Wave Length Short-Circuited Stub", 《PROCEEDINGS OFASIA-PACIFIC MICROWAVE CONFERENCE 2007》 * |
| SATISH CHAND GUPTA等: "Design of Multi notch Band UWB Filter", 《PROCEEDINGS OF 2014 RAECS UIET PANJAB UNIVERSITY CHANDIGARH》 * |
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Application publication date: 20200417 |
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