CN219759932U - Switch filter based on terminal loading type coupling line structure - Google Patents
Switch filter based on terminal loading type coupling line structure Download PDFInfo
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- CN219759932U CN219759932U CN202321400159.3U CN202321400159U CN219759932U CN 219759932 U CN219759932 U CN 219759932U CN 202321400159 U CN202321400159 U CN 202321400159U CN 219759932 U CN219759932 U CN 219759932U
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- 230000008878 coupling Effects 0.000 title claims description 30
- 238000010168 coupling process Methods 0.000 title claims description 30
- 238000005859 coupling reaction Methods 0.000 title claims description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000003780 insertion Methods 0.000 abstract description 8
- 230000037431 insertion Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of electronic elements, in particular to a switch filter based on a terminal loading type coupled line structure, which comprises a metal bottom plate, a coupled line structure, an open circuit branch, a short circuit branch, a diode, a capacitor, a resistor and a power supply. The effect of realizing the switch is generally that diodes are adopted, the more the number of the diodes is, the larger the insertion loss is, and at present, the switch is generally realized by more than two pairs of diodes.
Description
Technical Field
The utility model relates to the technical field of electronic elements, in particular to a switch filter based on a terminal loading type coupling line structure.
Background
The switch filter group generally adopts a mode of combining a filter with a microwave switch, wherein the filter has three structures of a microstrip filter, a waveguide filter and a cavity filter.
However, the existing microstrip filter has the defects of low structure Q value, large insertion loss, poor out-of-band rejection, large number of diodes, large insertion loss, complex design and simulation, large insertion loss, and incapability of meeting the requirements of high frequency and high impedance, and most of the prior art schemes need more diodes to realize the switching effect, large number and large insertion loss. The waveguide filter and the cavity filter are not suitable for the application of the miniaturized radio frequency front end due to large volume, high manufacturing cost and complex structure.
Disclosure of Invention
The utility model aims to provide a switch filter based on a terminal loading type coupling line structure, and aims to solve the problem that the existing filter is large in size.
In order to achieve the above purpose, the utility model provides a switch filter based on a terminal loading type coupling line structure, which comprises a metal bottom plate, a coupling line structure, an open circuit branch, a short circuit branch, a diode, a capacitor, a resistor and a power supply, wherein the coupling line structure is connected with the metal bottom plate, the open circuit branch is connected with the coupling line structure, the short circuit branch is connected with the coupling line structure, one end of the diode is connected with the coupling line structure, one end of the capacitor is connected with the coupling line structure, the other end of the capacitor is grounded, one end of the resistor is connected with one end of the capacitor, and the power supply is connected with the other end of the resistor.
The coupling line structure is provided with a first port, a third port and a fourth port, wherein the first port and the third port are connected in series with the open branch, and the fourth port is used for connecting the short branch.
The coupling line structure, the open circuit branch joint and the short circuit branch joint are all microstrip lines.
Wherein the resistance value of the resistor is 2k.
Wherein, the blocking capacitance of the capacitor is 100pF.
The utility model relates to a switch filter based on a terminal loading type coupling line structure, which comprises a metal bottom plate, a coupling line structure, a short circuit branch, a diode, a capacitor, a resistor and a power supply, wherein the metal bottom plate provides mounting conditions for the coupling line structure, the short circuit branch, the diode, the capacitor, the resistor and the power supply. The effect of realizing the switch is generally that diodes are adopted, the more the number of the diodes is, the larger the insertion loss is, and at present, the switch is generally realized by adopting more than one pair of diodes.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of a switching filter based on a terminal-loading type coupled line structure according to a first embodiment of the present utility model.
Fig. 2 is a simulation result filtering state diagram of the terminal loading type switching filter.
Fig. 3 is a simulation result blocking state diagram of the terminal loading type switching filter.
Detailed Description
Referring to fig. 1-3, for this embodiment, the capacitor comprises a metal bottom plate, a coupled line structure, a short-circuit branch, a diode, a capacitor, a resistor and a power supply, wherein the coupled line structure is connected with the metal bottom plate, the short-circuit branch is connected with the coupled line structure, the open-circuit branch is connected with the coupled line structure, one end of the diode is connected with the coupled line structure, one end of the capacitor is connected with the coupled line structure, the other end of the capacitor is grounded, one end of the resistor is connected with one end of the capacitor, and the power supply is connected with the other end of the resistor. The metal bottom plate provides mounting conditions for the coupling line structure, the short circuit branch joint, the open circuit branch joint, the diode, the capacitor, the resistor and the power supply, the short circuit branch joint, the diode, the capacitor, the resistor and the power supply can be communicated through the coupling line structure, out-of-band rejection performance can be enhanced through the short circuit branch joint, the diode is a Skyworks product SMP1345-079LFp-i-n diode, the resistor is used for providing direct current bias and blocking radio frequency signals, the power supply can be used for supplying power to the diode through the resistor, and the capacitor is used for preventing the loaded switching power supply from affecting the performance of the filter.
The coupling line structure is provided with a first port, a third port and a fourth port, wherein the first port and the third port are connected in series with the open branch, and the fourth port is used for connecting the short branch.
And secondly, the coupling line structure and the short circuit branch are microstrip lines.
Meanwhile, the resistance value of the resistor is 2k.
In addition, the blocking capacitance of the capacitor is 100pF.
The metal bottom plate provides mounting conditions for the coupled line structure, the short circuit branch, the open circuit branch, the diode, the capacitor, the resistor and the power supply, and in the utility model, a second-order symmetrical structure is adopted to reduce the debugging optimization quantity by half, and meanwhile, the in-band performance and the out-of-band rejection performance are excellent. The effect of realizing the switch is generally that diodes are adopted, the more the number of the diodes is, the larger the insertion loss is, and at present, the switch is generally realized by more than two pairs of diodes.
Examples:
according to the theory in the design scheme, the required center frequency and bandwidth are determined, the impedance value and the electrical length of each branch theory can be calculated, and then the length and the width of the microstrip line are converted according to the actual processed board. The center frequency is set to be 1GHz, the bandwidth is 400MHz, and the length and the width of the microstrip line are calculatedModeling and simulation were performed in Sonnet. The microstrip filter is composed of a terminal connected with a Coupled Line Structure (TCLs), two ports of four terminals of the coupled line are connected with two serially connected open branches, and one port is connected with a short-circuit branch. The coupling line and the branch joint are microstrip lines and are composed of non-microstrip lines with different widths and composed of different impedance values, wherein two pairs of transmission zero points are added to two serially connected branch joints, and the short circuit branch joint enhances out-of-band rejection performance. According to the theory, after substituting center frequency, bandwidth and the like, ideal impedance and electric length, Z can be calculated 0e ＝159.7Ω,Z 0o ＝91.15Ω,θ＝88.9°,Z 1 ＝35Ω,θ＝95°,Z 2 ＝180Ω,θ＝87.25°,Z 3 ＝78.5Ω,θ＝79°,Z 4 ＝136Ω,θ＝93.57°,Z 5 =136 Ω, θ=87°. Wherein C is 1 Is the blocking capacitor C loaded on the port 1 1 =100 pF, in order to prevent the loaded switching power supply from affecting the filter performance. The resistor rs=2k in the figure is used to provide dc bias and block the rf signal, and the Skyworks product SMP1345-079LFp-i-n diode is used, the equivalent circuit of which is shown. An external direct Voltage (VSW) in parallel with the resistor is used to turn the diode on/off. When the reverse bias p-i-n diode is set, the port 4 is turned on, i.e. the switch shows an on-state filtering state, and when the p-i-n diode is forward biased, the port 4 is turned off, i.e. the switch shows an off-state blocking state.
The utility model can realize the switching and filtering functions by adopting the terminal loading type coupling line structure, and can achieve excellent performance by using only one diode. Compared with the prior art, the utility model can directly bring the following beneficial effects:
1. the number of debugging optimization parameters is reduced by half, and the manufacturing cost and the debugging time are reduced;
2. the in-band performance and the out-of-band rejection performance are excellent, and unwanted signals can be effectively filtered;
3. only one diode is needed, so that the insertion loss can be reduced, and the cost is saved.
The foregoing disclosure is only illustrative of one or more preferred embodiments of the present utility model, and it is not intended to limit the scope of the claims hereof, as persons of ordinary skill in the art will understand that all or part of the processes for practicing the embodiments described herein may be practiced with equivalent variations in the claims, which are within the scope of the utility model.
Claims (5)
1. A switch filter based on a terminal loading type coupled line structure is characterized in that,
the capacitive load comprises a metal bottom plate, a coupling line structure, an open circuit branch, a short circuit branch, a diode, a capacitor, a resistor and a power supply, wherein the coupling line structure is connected with the metal bottom plate, the open circuit branch is connected with the coupling line structure, the short circuit branch is connected with the coupling line structure, one end of the diode is connected with the coupling line structure, one end of the capacitor is connected with the coupling line structure, the other end of the capacitor is grounded, one end of the resistor is connected with one end of the capacitor, and the power supply is connected with the other end of the resistor.
2. A switched filter based on a terminally loaded coupled line structure as claimed in claim 1,
the coupling line structure is provided with a first port, a third port and a fourth port, wherein the first port and the third port are connected in series with the open branch, and the fourth port is used for connecting the short branch.
3. A switched filter based on a terminally loaded coupled line structure as claimed in claim 2,
the coupling line structure, the open circuit branch joint and the short circuit branch joint are all microstrip lines.
4. A switched filter based on a terminally loaded coupled line structure as claimed in claim 3,
the resistance value of the resistor is 2k.
5. A switched filter based on a terminally loaded coupled line structure as claimed in claim 4,
the blocking capacitance of the capacitor is 100pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321400159.3U CN219759932U (en) | 2023-06-05 | 2023-06-05 | Switch filter based on terminal loading type coupling line structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321400159.3U CN219759932U (en) | 2023-06-05 | 2023-06-05 | Switch filter based on terminal loading type coupling line structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219759932U true CN219759932U (en) | 2023-09-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321400159.3U Active CN219759932U (en) | 2023-06-05 | 2023-06-05 | Switch filter based on terminal loading type coupling line structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219759932U (en) |
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2023
- 2023-06-05 CN CN202321400159.3U patent/CN219759932U/en active Active
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