CN112909462A - L-band microstrip low-pass filter and radio frequency front-end transmitting system - Google Patents
L-band microstrip low-pass filter and radio frequency front-end transmitting system Download PDFInfo
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- CN112909462A CN112909462A CN202110200471.7A CN202110200471A CN112909462A CN 112909462 A CN112909462 A CN 112909462A CN 202110200471 A CN202110200471 A CN 202110200471A CN 112909462 A CN112909462 A CN 112909462A
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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
Abstract
The invention discloses an L-band microstrip low-pass filter and a radio frequency front-end transmitting system, relating to the technical field of radio frequency microwaves, wherein a metal microstrip comprises a signal input end, a signal output end, a microstrip stub, a microstrip long thin line and a microstrip short thin line, and further comprises a first microstrip long thin line, a second microstrip long thin line, a first microstrip short thin line and a second microstrip short thin line, the first microstrip long thin line and the second microstrip long thin line are arranged in bilateral symmetry about a vertical central axis of a metal ground, the microstrip short thin lines are also arranged in the same symmetry, the microstrip stub is connected with the first microstrip short thin line and the second microstrip short thin line, one end of the first microstrip long thin line is connected with the signal input end, one end of the second microstrip long thin line is connected with the signal output end, and under the condition of higher output power, a common LC filter can not bear higher power, so that the microstrip low-pass, and the volume of the low-pass filter is reduced on the basis, so that the low-pass filter can be applied to more practical projects.
Description
Technical Field
The invention relates to the technical field of radio frequency microwave, in particular to an L-band microstrip low-pass filter and a radio frequency front-end transmitting system.
Background
In the field of filters, filters can be classified into active and passive filters, depending on the operating frequency and the type of components employed. Among passive filters, there can be further divided into lumped parameter filters and distributed parameter filters. The main elements of the lumped parameter filter are the LC element and the crystal resonator, and the main elements of the distributed system filter are the coaxial line and the microstrip transmission line. The active filter is formed by cascaded amplifiers or other active devices.
In the front-end part of communication radio frequency, the filter plays an important role, mainly to selectively pass or reject a certain frequency band. Usually, a low-pass or band-pass filter is used in the rf front-end transmitting part to pass the useful signal and filter out the remaining clutter signals. The traditional LC filter cannot bear excessive power, and the microstrip line filter has large volume.
How to solve the above problems is urgently needed.
Disclosure of Invention
In view of the above, the present invention provides an L-band microstrip low-pass filter and a radio frequency front-end transmitting system, which adopt the form of open stub to ensure that high power can be passed through, and further reduce the size of the filter, have better rectangular coefficient, can bear high power, and further reduce the size, and have an in-band insertion loss less than 0.5dB, discrete devices of the transmitting system design PA, LNA and SWITCH to implement TDD duplexing and control, and a signal is amplified by 20WPA, then passes through an LPF, and then is transmitted to an antenna.
The invention is realized by the following technical scheme:
the utility model provides a L wave band microstrip low pass filter, includes the dielectric plate, L wave band microstrip low pass filter is applied to radio frequency front end transmitting system, a surface of dielectric plate is equipped with metal microstrip, another surface of dielectric plate is equipped with the metal ground, metal microstrip includes signal input part, signal output part, microstrip stub, the long fine rule of microstrip and the short fine rule of microstrip, the long fine rule of microstrip includes the long fine rule of first microstrip and the long fine rule of second microstrip, the long fine rule of first microstrip and the long fine rule of second microstrip set up about the vertical central axis bilateral symmetry of metal ground, the short fine rule of microstrip includes the short fine rule of first microstrip and the short fine rule of second microstrip, the short fine rule of first microstrip and the short fine rule of second microstrip set up about the vertical central axis bilateral symmetry of metal ground. The signal input part is connected to first microstrip short fine line one end, second microstrip short fine line and microstrip short stub are connected to the first microstrip short fine line other end, just the second microstrip short fine line is connected to the microstrip short stub, signal output part is connected to the second microstrip short fine line other end, signal input part is connected to first microstrip long fine line one end, signal output part is connected to second microstrip long fine line one end.
In the scheme, under the condition of larger output power, a common LC filter cannot bear larger power, the structure can bear large power, and meanwhile, the structure design further reduces the volume reasonably, so that the LC filter can be applied to more practical projects.
Furthermore, the signal input end, the signal output end, the microstrip stub, the microstrip long thin line and the microstrip short thin line are all metal copper sheets with strip structures.
Preferably, the first and second microstrip short thin lines each have a length of 10mm, and the first and second microstrip short thin lines each have a width of 0.5 mm.
Further, the first and second microstrip long fine lines each have a length of 18.5mm, and the first and second microstrip long fine lines have a width of 0.25 mm.
Preferably, the length of the microstrip line of the signal input end is 1.5mm, and the width of the microstrip line of the signal input end is 1.1 mm; the length of the microstrip line of the signal output end is 1.5mm, and the width of the microstrip line of the signal output end is 1.1 mm.
Preferably, the microstrip stub length is 9mm, and the microstrip stub width is 6 mm.
Optionally, the dielectric plate is a rocky 4350b dielectric plate.
A radio frequency front end transmitting system uses the L-band microstrip low-pass filter and comprises a signal receiving module, a time slot control module, a wireless encryption module and an antenna transmitting port, wherein the signal receiving module acquires a signal and transmits the signal to the L-band microstrip low-pass filter through the time slot control module and transmits the signal through the antenna transmitting port.
In the scheme, due to the reason of higher power, the implementation is realized without using an LC filter, an L-waveband micro-strip low-pass filter is designed, and the size of the micro-strip low-pass filter is reduced on the premise of meeting the requirement of the scheme, so that the overall size is also reduced, and the in-band insertion loss is less than 0.5 dB.
Preferably, the wireless encryption module is 20WPA, and the antenna transmission port includes a PA interface, a LNA interface, and a SWITCH interface.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to an L-band microstrip low-pass filter and a radio frequency front end transmitting system, which can reduce the size of the filter while ensuring that the high power can be borne, so that the whole size of a transmitting part of the radio frequency front end is reduced and the target requirement can be met, in addition, the radio frequency front end adopts discrete devices to design PA, LNA and SWITCH, TDD duplex and control are realized, in addition, due to the use of 20WPA, the following low-pass filter needs to bear 20W power, due to the higher power, on the premise of meeting the scheme requirement, the size of the microstrip low-pass filter is reduced, so that the whole size is also reduced, the in-band insertion loss is less than 0.5dB, and the invention is realized without using an LC filter.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an L-band microstrip low-pass filter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an overall structure of an L-band microstrip low-pass filter according to an embodiment of the present invention;
FIG. 3 is a simulation diagram of S-parameters in an embodiment of the present invention;
FIG. 4 is a diagram of an actual test chart in an embodiment of the present invention;
fig. 5 is a schematic diagram of an rf front-end transmitting system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Examples
As shown in fig. 1 and 2, the L-band microstrip low-pass filter of the present invention includes a dielectric plate, the L-band microstrip low-pass filter is applied to a radio frequency front end transmission system, one surface of the dielectric plate is provided with a metal microstrip, the other surface of the dielectric plate is provided with a metal ground, the metal microstrip includes a signal input end, a signal output end, a microstrip stub, a microstrip long thin line, and a microstrip short thin line, the microstrip long thin line includes a first microstrip long thin line and a second microstrip long thin line, the first microstrip long thin line and the second microstrip long thin line are arranged in bilateral symmetry with respect to a vertical central axis of the metal ground, the microstrip short thin line includes a first microstrip short thin line and a second microstrip short thin line, and the first microstrip short thin line and the second microstrip short thin line are arranged in bilateral symmetry with respect to the vertical central axis of the metal ground. The signal input part is connected to first microstrip short fine line one end, second microstrip short fine line and microstrip short stub are connected to the first microstrip short fine line other end, just the second microstrip short fine line is connected to the microstrip short stub, signal output part is connected to the second microstrip short fine line other end, signal input part is connected to first microstrip long fine line one end, signal output part is connected to second microstrip long fine line one end.
It can be understood that under the condition of larger output power, the ordinary LC filter can not bear larger power, so the microstrip low-pass filter is selected to realize the relevant functions, and the volume of the low-pass filter is reduced on the basis, so that the low-pass filter can be applied to more practical projects
As a preferable example of the above embodiment, the signal input terminal, the signal output terminal, the microstrip stub, the microstrip long thin line, and the microstrip short thin line are all metal copper sheets with strip structures.
As shown in fig. 1, the first and second microstrip short thin lines preferably have a length of 10mm and a width of 0.5mm, respectively.
In the above embodiment, as shown in fig. 1, the first and second microstrip long thin lines each have a length of 18.5mm, and the first and second microstrip long thin lines each have a width of 0.25 mm.
As a preferable example of the above embodiment, as shown in fig. 1, the microstrip line length of the signal input terminal is 1.5mm, and the microstrip line width of the signal input terminal is 1.1 mm; the length of the microstrip line of the signal output end is 1.5mm, and the width of the microstrip line of the signal output end is 1.1 mm.
As a preferable example of the above embodiment, as shown in fig. 1, the microstrip stub length is 9mm, and the microstrip stub width is 6 mm.
Further, the dielectric plate is a dielectric plate of rogers 4350 b.
It can be understood that, in the invention, the insertion loss of the filter at 1.67GHz is less than 0.5dB, a hodes 4350b dielectric plate is used, the surface of the dielectric plate is a metal microstrip, the lower surface is a metal ground, the filter adopts the open stub structure design, and the structure has the advantages of better rectangular coefficient and farther parasitic passband.
As shown in fig. 1, the parameters of each microstrip line are shown in table 1:
TABLE 1
Based on the above parameters, after simulation tests, as shown in fig. 1, fig. 3 and fig. 4, the structure of the L-band microstrip low-pass filter and the S-parameter simulation diagram show that the size of the microstrip low-pass filter is 14.5mm by 12.9mm, the cutoff frequency is 2GHz, and the insertion loss is less than 0.5dB at the required frequency of 1.67GHz, so that the invention can be used for the L-band radio frequency front end transmitting part, further reduces the volume while bearing high power, and reasonably solves the problems existing in the scheme
In addition, the invention also provides a radio frequency front end transmitting system applying the L-band microstrip low-pass filter, which comprises a signal receiving module, a time slot control module, a wireless encryption module and an antenna transmitting port, wherein the signal receiving module acquires signals, transmits the signals to the L-band microstrip low-pass filter through the time slot control module and transmits the signals through the antenna transmitting port, and reduces the size of the microstrip low-pass filter on the premise of meeting the requirement of a scheme, so that the overall size is also reduced, and the in-band insertion loss is less than 0.5 dB.
Further, the wireless encryption module is 20WPA, and the antenna transmission port comprises a PA interface, a LNA interface and a SWITCH interface.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An L-band microstrip low-pass filter comprises a dielectric plate and is characterized in that the L-band microstrip low-pass filter is applied to a radio frequency front end transmitting system, a metal microstrip is arranged on one surface of the dielectric plate, a metal ground is arranged on the other surface of the dielectric plate, the metal microstrip comprises a signal input end, a signal output end, a microstrip short stub, a microstrip long fine line and a microstrip short fine line, the microstrip long fine line comprises a first microstrip long fine line and a second microstrip long fine line, the first microstrip long fine line and the second microstrip long fine line are arranged in a bilateral symmetry mode about the vertical central axis of the metal ground, the microstrip short fine line comprises a first microstrip short fine line and a second microstrip short fine line, and the first microstrip short fine line and the second microstrip short fine line are arranged in a bilateral symmetry mode about the vertical central axis of the metal ground;
one end of the first microstrip short thin line is connected with a signal input end, the other end of the first microstrip short thin line is connected with a second microstrip short thin line and a microstrip stub line, the microstrip stub line is connected with the second microstrip short thin line, and the other end of the second microstrip short thin line is connected with a signal output end;
one end of the first microstrip long thin line is connected with a signal input end, and one end of the second microstrip long thin line is connected with a signal output end.
2. The L-band microstrip low-pass filter according to claim 1, wherein the signal input terminal, the signal output terminal, the microstrip stub, the microstrip long thin line and the microstrip short thin line are all metal copper sheets with strip structures.
3. The L-band microstrip low pass filter according to claim 1, wherein the first and second microstrip short thin lines each have a length of 10mm, and the first and second microstrip short thin lines each have a width of 0.5 mm.
4. The L-band microstrip low pass filter according to claim 1, wherein the first microstrip long thin line and the second microstrip long thin line are both 18.5mm in length, and the first microstrip long thin line and the second microstrip long thin line are 0.25mm in width.
5. The L-band microstrip low pass filter according to claim 1, wherein the microstrip line length of the signal input terminal is 1.5mm, and the microstrip line width of the signal input terminal is 1.1 mm; the length of the microstrip line of the signal output end is 1.5mm, and the width of the microstrip line of the signal output end is 1.1 mm.
6. The L-band microstrip low pass filter according to claim 1, wherein the microstrip stub length is 9mm and the microstrip stub width is 6 mm.
7. The L-band microstrip low pass filter according to claim 1 wherein said dielectric slab is a rocky 4 b dielectric slab.
8. The RF front-end transmitting system using the L-band microstrip low-pass filter as claimed in any one of claims 1 to 7, wherein the RF front-end transmitting system comprises a signal receiving module, a time slot control module, a wireless encryption module and an antenna transmitting port, and the signal receiving module acquires a signal and transmits the signal to the L-band microstrip low-pass filter through the time slot control module and transmits the signal through the antenna transmitting port.
9. The RF front-end transmission system according to claim 8, wherein the wireless encryption module is 20WPA, and the antenna transmission port includes a PA interface, an LNA interface and a SWITCH interface.
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| CN202110200471.7A CN112909462A (en) | 2021-02-23 | 2021-02-23 | L-band microstrip low-pass filter and radio frequency front-end transmitting system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1065402A (en) * | 1996-06-26 | 1998-03-06 | Korea Electron Telecommun | Low pass filter adopting microstrip open stub line system and its manufacture |
| CN204905390U (en) * | 2015-08-19 | 2015-12-23 | 成都九洲迪飞科技有限责任公司 | Miniaturized high -power microstrip low pass filter |
| CN112260713A (en) * | 2020-10-22 | 2021-01-22 | 北京邮电大学 | Transceiver design method and device |
-
2021
- 2021-02-23 CN CN202110200471.7A patent/CN112909462A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1065402A (en) * | 1996-06-26 | 1998-03-06 | Korea Electron Telecommun | Low pass filter adopting microstrip open stub line system and its manufacture |
| CN204905390U (en) * | 2015-08-19 | 2015-12-23 | 成都九洲迪飞科技有限责任公司 | Miniaturized high -power microstrip low pass filter |
| CN112260713A (en) * | 2020-10-22 | 2021-01-22 | 北京邮电大学 | Transceiver design method and device |
Non-Patent Citations (2)
| Title |
|---|
| DHIRENDRA KUMAR 等: ""Compact Low Pass Filter Design for L-Band Application"", 《JOURNAL OF ELECTROMAGNETIC ANALYSIS AND APPLICATIONS》 * |
| MAHMUT BERA GUNASLAN 等: ""Parallel Line Microstrip Low Pass Filter Design"", 《2017 25TH SIGNAL PROCESSING AND COMMUNICATIONS APPLICATIONS CONFERENCE (SIU)》 * |
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