CN109786906B - Filter based on coplanar waveguide transmission line - Google Patents
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- CN109786906B CN109786906B CN201910202632.9A CN201910202632A CN109786906B CN 109786906 B CN109786906 B CN 109786906B CN 201910202632 A CN201910202632 A CN 201910202632A CN 109786906 B CN109786906 B CN 109786906B
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Abstract
The invention discloses a filter based on a coplanar waveguide transmission line, which consists of a dielectric substrate, a first metal grounding surface arranged on the first surface of the dielectric substrate, a second metal grounding surface arranged on the second surface of the dielectric substrate and the coplanar waveguide transmission line arranged on the first metal grounding surface; the coplanar waveguide transmission lines are bilaterally symmetrical; the coplanar waveguide transmission line comprises a first transmission line to a seventh transmission line which are sequentially connected end to end, and the first end of the first transmission line and the second end of the seventh transmission line are both open-circuited; the first transmission line to the seventh transmission line constitute a one-half wavelength resonator; the coplanar waveguide transmission line further comprises an eighth transmission line and a ninth transmission line, a first end of the eighth transmission line is connected with the first connection point on the second transmission line, and a first end of the ninth transmission line is connected with the second connection point on the sixth transmission line. The filter provided by the embodiment of the invention has the advantages of good low-pass filter characteristic, small area and low cost.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a filter based on a coplanar waveguide transmission line.
Background
With the increasing crowding of spectrum resources, wireless communication systems are developed towards multiband and microwave miniaturization, and filters with frequency selection function are indispensable in the whole wireless communication systems, and are also developed towards multiband and chipization according to the development trend of wireless communication systems.
The conventional filter is composed of a series of lumped components (capacitors and inductors), and when the filter is applied to a high frequency, the capacitors and inductors of the filter generate parasitic effects at the high frequency due to the shortened wavelength, so that the filter composed of the lumped components has a certain limitation when applied to the high frequency, and the sizes of the capacitors and inductors cannot be neglected any more at this time, which results in a large area of the filter, and in addition, the cost of the lumped components is high.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a filter based on a coplanar waveguide transmission line, which has good low-pass filter characteristics, a small area, and a low cost.
In order to solve the above technical problem, an embodiment of the present invention provides a filter based on a coplanar waveguide transmission line, where the filter is composed of a dielectric substrate, a first metal ground plane disposed on a first surface of the dielectric substrate, a second metal ground plane disposed on a second surface of the dielectric substrate, and a coplanar waveguide transmission line disposed on the first metal ground plane; the coplanar waveguide transmission line is bilaterally symmetrical;
the coplanar waveguide transmission line comprises a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a fifth transmission line, a sixth transmission line and a seventh transmission line which are sequentially connected end to end, and both a first end of the first transmission line and a second end of the seventh transmission line are open-circuited; the first transmission line to the seventh transmission line constitute a one-half wavelength resonator;
the coplanar waveguide transmission line further comprises an eighth transmission line and a ninth transmission line, wherein the first end of the eighth transmission line is connected with the first connection point on the second transmission line, and the first end of the ninth transmission line is connected with the second connection point on the sixth transmission line; the eighth transmission line is a first feed-in line of the filter, and the ninth transmission line is a second feed-in line of the filter;
the first connecting point divides the second transmission line into a first part and a second part, and the first part and the first transmission line form a first transmission zero point with a quarter wavelength; wherein the first portion is connected with the first transmission line;
the second connecting point divides the sixth transmission line into a third part and a fourth part, and the fourth part and the seventh transmission line form a second transmission zero point with a quarter wavelength; wherein the fourth portion is connected with the seventh transmission line.
Further, the lengths of the first transmission line, the third transmission line, the fifth transmission line and the seventh transmission line are all a first length; the lengths of the second transmission line, the fourth transmission line and the sixth transmission line are all a second length; the eighth transmission line and the ninth transmission line each have a third length.
Further, the first length is 235 mils, the second length is 90 mils, and the third length is 100 mils.
Further, the length of the first portion is 89 mils, and the length of the second portion is 1 mil; the length of the third portion is 1mil, and the length of the fourth portion is 89 mils.
Further, the impedance of the coplanar waveguide transmission line is 50 Ω, and the line width is 10 mil.
Further, the dielectric coefficient of the dielectric substrate is 4.4.
Further, the thickness of the medium substrate is 4 mil.
Furthermore, the first metal grounding surface and the second metal grounding surface are both copper plating layers.
Further, the thickness of the first metal ground plane and the thickness of the second metal ground plane are both 1.5 mil.
Compared with the prior art, the embodiment of the invention provides a filter based on a coplanar waveguide transmission line, which consists of a dielectric substrate, a first metal ground plane arranged on the first surface of the dielectric substrate, a second metal ground plane arranged on the second surface of the dielectric substrate and the coplanar waveguide transmission line arranged on the first metal ground plane; the eighth transmission line and the ninth transmission line of the coplanar waveguide transmission line are respectively a first feed-in line and a second feed-in line of the filter; the filter has the advantages of good low-pass filter characteristic, small area and low cost.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a filter based on coplanar waveguide transmission lines provided by the present invention;
fig. 2 is a schematic size diagram of a preferred embodiment of a filter based on coplanar waveguide transmission lines according to the present invention;
fig. 3 is a diagram of a two-dimensional simulation result of a filter based on coplanar waveguide transmission lines provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The embodiment of the present invention provides a filter based on coplanar waveguide transmission lines, which is shown in fig. 1 and is a schematic structural diagram of a preferred embodiment of the filter based on coplanar waveguide transmission lines, the filter is composed of a dielectric substrate 1, a first metal ground plane 2 disposed on a first surface of the dielectric substrate 1, a second metal ground plane 3 disposed on a second surface of the dielectric substrate 1, and a coplanar waveguide transmission line disposed on the first metal ground plane 2; the coplanar waveguide transmission line is bilaterally symmetrical;
the coplanar waveguide transmission line comprises a first transmission line L1, a second transmission line L2, a third transmission line L3, a fourth transmission line L4, a fifth transmission line L5, a sixth transmission line L6 and a seventh transmission line L7 which are sequentially connected end to end, and a first end of the first transmission line L1 and a second end of the seventh transmission line L7 are both open-circuited; the first to seventh transmission lines L1 to L7 constitute a one-half wavelength resonator;
the coplanar waveguide transmission line further comprises an eighth transmission line L8 and a ninth transmission line L9, a first end of the eighth transmission line L8 is connected with a first connection point on the second transmission line L2, and a first end of the ninth transmission line L9 is connected with a second connection point on the sixth transmission line L6; the eighth transmission line L8 is a first feeding line of the filter, and the ninth transmission line L9 is a second feeding line of the filter.
Specifically, a first metal ground plane 2 is laid on a first surface (i.e., an upper surface) of a dielectric substrate 1, a second metal ground plane 3 is laid on a second surface (i.e., a lower surface) of the dielectric substrate 1, the first metal ground plane 2, the dielectric substrate 1, and the second metal ground plane 3 are collectively referred to as a printed board of a filter, a Coplanar Waveguide (CPW) transmission line is disposed on the upper surface of the printed board, i.e., the first metal ground plane 2, and a structure of the filter formed by the CPW transmission lines is bilaterally symmetric.
The CPW transmission lines include a first transmission line L1, a second transmission line L2, a third transmission line L3, a fourth transmission line L4, a fifth transmission line L5, a sixth transmission line L6, and a seventh transmission line L7, a first end of the first transmission line L1 is open-circuited, a second end of the first transmission line L1 is connected to a first end of the second transmission line L2, a second end of the second transmission line L2 is connected to a first end of the third transmission line L3, a second end of the third transmission line L3 is connected to a first end of the fourth transmission line L4, a second end of the fourth transmission line L4 is connected to a first end of the fifth transmission line L5, a second end of the fifth transmission line L5 is connected to a first end of the sixth transmission line L6, a second end of the sixth transmission line L6 is connected to a first end of the seventh transmission line L7, a second end of the seventh transmission line L7 is open-circuited, a second end of the seventh transmission line L7 is formed by one of the first transmission line L1 to the seventh transmission line L36, the resonant frequency of the filter passband is represented, wherein the half wavelength is selected to produce a standing wave of electromagnetic waves to form the resonator.
The CPW transmission line further includes an eighth transmission line L8 and a ninth transmission line L9, a first end of the eighth transmission line L8 is connected to a first connection point on the second transmission line L2, a second end of the eighth transmission line L8 is connected to an input terminal or an output terminal of the filter, and the eighth transmission line L8 is a first feed-in line of the filter; a first end of the ninth transmission line L9 is connected to the second connection point on the sixth transmission line L6, a second end of the ninth transmission line L9 is connected to the output terminal or the input terminal of the filter, and the ninth transmission line L9 is the second feeding line of the filter.
It should be noted that fig. 1 is a top view of the filter, which shows the upper surface of the printed board, and the transmission lines of the CPW transmission line shown in fig. 1 are all connected vertically (the area of the filter can be optimized), which is only a schematic structural diagram of a preferred embodiment of the connection relationship of the transmission lines, and the connection angle between the transmission lines is not particularly limited in the present invention.
The filter based on the coplanar waveguide transmission line provided by the embodiment of the invention comprises a dielectric substrate, a first metal grounding surface arranged on the first surface of the dielectric substrate, a second metal grounding surface arranged on the second surface of the dielectric substrate and a CPW transmission line arranged on the first metal grounding surface; the CPW transmission lines are bilaterally symmetrical, a first transmission line to a seventh transmission line of the CPW transmission lines form a resonator with a half wavelength, and an eighth transmission line and a ninth transmission line of the CPW transmission lines are respectively a first feed-in line and a second feed-in line of the filter; compared with the traditional lumped component filter, the filter has good low-pass filter characteristics, small area and low cost, can reduce the chance of electromagnetic interference, and is more suitable for radio frequency microwave communication.
In addition, the structure of the CPW transmission line has the characteristics of flexible design degree and easy circuit integration design, and the design of the filter can be adjusted by changing the layout of the CPW transmission line, so that the CPW transmission line is beneficial to the design of multiple frequencies and chips of the filter.
In another preferred embodiment, the first connection point divides the second transmission line L2 into a first portion and a second portion, the first portion and the first transmission line L1 constituting a quarter-wavelength first transmission zero; wherein the first portion is connected with the first transmission line L1;
the second connection divides the sixth transmission line L6 into a third section and a fourth section, the fourth section and the seventh transmission line L7 constituting a quarter-wavelength second transmission zero; wherein the fourth portion is connected with the seventh transmission line L7.
Specifically, as shown in fig. 1, the first connection point on the second transmission line L2 divides the second transmission line L2 into two segments, i.e., a first segment and a second segment, the first segment is connected to the first transmission line L1, the second segment is connected to the third transmission line L3, and the first segment and the first transmission line L1 are connected to form an open transmission zero of a quarter wavelength, i.e., a first transmission zero, of the filter; the second connection point on the sixth transmission line L6 divides the sixth transmission line L6 into two sections, i.e., a third section and a fourth section, the third section is connected to the fifth transmission line L5, the fourth section is connected to the seventh transmission line L7, and the fourth section and the seventh transmission line L7 are connected to form another one-quarter-wavelength open transmission zero, i.e., a second transmission zero, of the filter.
According to the filter based on the coplanar waveguide transmission line, the two high-frequency zero points are formed through the two quarter-wavelength open-circuit transmission lines, so that the filter has a high suppression degree at high frequency.
Referring to fig. 2, which is a schematic size diagram of a preferred embodiment of the filter based on coplanar waveguide transmission lines according to the present invention, in combination with the above embodiment, the lengths of the first transmission line L1, the third transmission line L3, the fifth transmission line L5 and the seventh transmission line L7 are all the first length L1; the lengths of the second transmission line L2, the fourth transmission line L4 and the sixth transmission line L6 are all a second length L2; the lengths of the eighth transmission line L8 and the ninth transmission line L9 are each a third length L3.
It will be appreciated that the filter dimensions are: length is (l1+ l3) ((3) l2), length of the half-wavelength resonator (i.e. length of the CPW transmission line constituting the resonator) is 4 l1+3 l2, wherein it should be noted that the CPW transmission line itself has a line width, for clarity, the CPW transmission line shown in fig. 2 has a certain width, and in the size calculation, taking the width of the filter as an example, the width of the filter should be actually 3 l2+4 line width, but since the line width of the CPW transmission line is small and generally differs greatly from the length of the transmission line, the line width of the CPW transmission line can be ignored, and the width of the filter is considered to be 3 l2, and the line widths of other places can be ignored, and will not be described again.
Preferably, the first length is 235 mils, the second length is 90 mils, and the third length is 100 mils.
In conjunction with the above embodiments, the length parameters of each transmission line, i.e., l 1-235 mil, l 2-90 mil, and l 3-100 mil, are defined in the embodiments of the present invention, and are specifically parameters required for designing a 2.4GHz low-pass filter based on the coplanar waveguide transmission line.
Preferably, the length of the first part is 89 mils, and the length of the second part is 1 mil; the length of the third portion is 1mil, and the length of the fourth portion is 89 mils.
With reference to the above embodiments, the length parameters of the first and second portions of the second transmission line L2 and the third and fourth portions of the sixth transmission line L6 are defined, specifically, the length parameters are parameters required to generate the resonance point of the filter at 4.8GHz, and the length of the transmission line forming the transmission zero point of the open circuit with a quarter wavelength is L1+ L4-235 mil + 89-324 mil.
In yet another preferred embodiment, the impedance of the coplanar waveguide transmission line is 50 Ω and the line width is 10 mil.
It should be noted that the typical transmission line characteristic impedance is 50 Ω, and there is no reflection loss.
Preferably, the dielectric substrate has a dielectric coefficient of 4.4.
Preferably, the media substrate has a thickness of 4 mils.
Preferably, the first metal ground plane and the second metal ground plane are both copper plating layers.
Preferably, the thickness of each of the first metal ground plane and the second metal ground plane is 1.5 mil.
Preferably, the printed sheet has a thickness of 7 mils.
In order to understand the filtering characteristics of the filter based on the coplanar waveguide transmission line provided by the embodiment of the invention, the designed filter is simulated by HFSS software, and the specific simulation parameter settings are shown in table 1:
TABLE 1 Filter simulation parameter Table
| Name | Value | Unit |
| W | 10 | mil |
| D | 8 | mil |
| l1 | 235 | mil |
| l2 | 90 | mil |
| l3 | 100 | mil |
| l4 | 89 | mil |
| H | 7 | mil |
| u | 5.5 | mil |
| Hd | 1.5 | mil |
| Lc | 0.6 | mil |
| Rd | 9 | mil |
| B | 30 | mil |
| C | 30 | mil |
| C1 | 35 | mil |
| |
12 | mil |
| K | -0.5 | mil |
L1, l2, l3 and l4 in table 1 have the same meanings as l1, l2, l3 and l4 in the above examples, and other parameters in table 1 are all parameter settings required for simulation.
The filter was simulated according to the parameter settings in table 1, and the two-dimensional simulation results obtained accordingly are shown in fig. 3, in which the abscissa represents the operating frequency of the filter and the ordinate represents the loss of the filter, wherein the curve S11 represents the return loss and the curve S21 represents the insertion loss, and it can be seen from fig. 3 that when the operating frequency of the filter is 2.44GHz, the return loss is less than-20 dB and the insertion loss is-0.54 dB, and thus the filter has good low-pass filter characteristics.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A filter based on coplanar waveguide transmission lines is characterized by comprising a dielectric substrate, a first metal ground plane arranged on the first surface of the dielectric substrate, a second metal ground plane arranged on the second surface of the dielectric substrate and a coplanar waveguide transmission line arranged on the first metal ground plane; the coplanar waveguide transmission line is bilaterally symmetrical;
the coplanar waveguide transmission line comprises a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a fifth transmission line, a sixth transmission line and a seventh transmission line which are sequentially connected end to end, and both a first end of the first transmission line and a second end of the seventh transmission line are open-circuited; the first transmission line to the seventh transmission line constitute a one-half wavelength resonator;
the coplanar waveguide transmission line further comprises an eighth transmission line and a ninth transmission line, wherein the first end of the eighth transmission line is connected with the first connection point on the second transmission line, and the first end of the ninth transmission line is connected with the second connection point on the sixth transmission line; the eighth transmission line is a first feed-in line of the filter, and the ninth transmission line is a second feed-in line of the filter;
the first connecting point divides the second transmission line into a first part and a second part, and the first part and the first transmission line form a first transmission zero point with a quarter wavelength; wherein the first portion is connected with the first transmission line;
the second connecting point divides the sixth transmission line into a third part and a fourth part, and the fourth part and the seventh transmission line form a second transmission zero point with a quarter wavelength; wherein the fourth portion is connected with the seventh transmission line.
2. A coplanar waveguide transmission line based filter according to claim 1 wherein the lengths of the first, third, fifth and seventh transmission lines are each a first length; the lengths of the second transmission line, the fourth transmission line and the sixth transmission line are all a second length; the eighth transmission line and the ninth transmission line each have a third length.
3. A coplanar waveguide transmission line based filter as defined in claim 2 wherein the first length is 235 mils, the second length is 90 mils, and the third length is 100 mils.
4. A coplanar waveguide transmission line based filter as set forth in claim 3 wherein the first section has a length of 89 mils and the second section has a length of 1 mil; the length of the third portion is 1mil, and the length of the fourth portion is 89 mils.
5. The coplanar waveguide transmission line-based filter according to any one of claims 1 to 4, wherein the coplanar waveguide transmission line has an impedance of 50 Ω and a line width of 10 mil.
6. The coplanar waveguide transmission line-based filter according to any one of claims 1 to 4 wherein the dielectric substrate has a dielectric constant of 4.4.
7. The coplanar waveguide transmission line-based filter according to any one of claims 1 to 4, wherein the dielectric substrate has a thickness of 4 mil.
8. The coplanar waveguide transmission line based filter as defined in any one of claims 1 to 4 wherein the first metallic ground plane and the second metallic ground plane are both copper plated.
9. The coplanar waveguide transmission line based filter according to any one of claims 1 to 4 wherein the first metallic ground plane and the second metallic ground plane each have a thickness of 1.5 mils.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200718010A (en) * | 2005-10-21 | 2007-05-01 | Hon Hai Prec Ind Co Ltd | A low-pass filter |
| KR20070074393A (en) * | 2006-01-09 | 2007-07-12 | 삼성전자주식회사 | Parallel coupled cpw line filter |
| TW200737583A (en) * | 2006-03-17 | 2007-10-01 | Hon Hai Prec Ind Co Ltd | Broad-band low-pass filter |
| CN205666302U (en) * | 2016-04-18 | 2016-10-26 | 六盘水师范学院 | Tippers etc. are from excimer type microwave filter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043096A (en) * | 2006-03-22 | 2007-09-26 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter with wide cut-off bandwidth |
| CN106785258B (en) * | 2016-11-29 | 2019-07-12 | 中国电子科技集团公司第二十九研究所 | A kind of Wide stop bands microstrip line low-pass filter and design method |
| CN207923770U (en) * | 2017-12-18 | 2018-09-28 | 河南师范大学 | Novel electrical parameter measuring device based on coplanar waveguide transmission line |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200718010A (en) * | 2005-10-21 | 2007-05-01 | Hon Hai Prec Ind Co Ltd | A low-pass filter |
| KR20070074393A (en) * | 2006-01-09 | 2007-07-12 | 삼성전자주식회사 | Parallel coupled cpw line filter |
| TW200737583A (en) * | 2006-03-17 | 2007-10-01 | Hon Hai Prec Ind Co Ltd | Broad-band low-pass filter |
| CN205666302U (en) * | 2016-04-18 | 2016-10-26 | 六盘水师范学院 | Tippers etc. are from excimer type microwave filter |
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