CN211046888U - Harmonic high-suppression filter circuit and harmonic high-suppression filter - Google Patents
Harmonic high-suppression filter circuit and harmonic high-suppression filter Download PDFInfo
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- CN211046888U CN211046888U CN201922438334.8U CN201922438334U CN211046888U CN 211046888 U CN211046888 U CN 211046888U CN 201922438334 U CN201922438334 U CN 201922438334U CN 211046888 U CN211046888 U CN 211046888U
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Abstract
the utility model discloses a harmonic high suppression filter circuit and harmonic high suppression wave filter, including input and output, it has first electric capacity to establish ties in proper order on the circuit between input to the output, the second electric capacity, fifth electric capacity and sixth electric capacity, be connected with first port matching resistance between first electric capacity and the input, be connected with first parallel resonance group between first electric capacity and the second electric capacity, still be connected with second parallel resonance group between fifth electric capacity and the sixth electric capacity, still be connected with second port matching resistance between sixth electric capacity and the output, first port matching resistance, the other end of first parallel resonance group and second parallel resonance group is equal ground connection, this circuit passes through L C resonance principle, the signal that will be higher than or be less than resonant frequency bypasses to ground, realize fine filtering characteristic and harmonic suppression characteristic.
Description
Technical Field
The utility model discloses be applied to the communication technology field, concretely relates to harmonic high suppression filter circuit and harmonic high suppression wave filter.
Background
At present, with the rapid development of modern electronic technology. 433MH communication antenna is applied to communications facilities, when the signal harmonic is great, perhaps antenna impedance mismatch arouses the harmonic, and when filter ground impedance increased simultaneously, the filter port matched impedance uses electric capacity can arouse ground coupling, leads to the instrument harmonic to restrain and reduces to can not satisfy equipment operation requirement, consequently design a harmonic high suppression filter and be very important.
Disclosure of Invention
The utility model aims at providing a harmonic high suppression filter circuit and harmonic high suppression wave filter to solve because of the too big instrument harmonic of ground impedance restraines the condition that reduces, will be higher than or be less than resonant frequency's signal bypass to ground simultaneously, realize fine filtering characteristic and outband harmonic rejection characteristic.
The utility model aims at realizing through following technical means, a harmonic high suppression filter circuit, including input and output, it has first electric capacity to establish ties in proper order on the circuit between input to the output, the second electric capacity, fifth electric capacity and sixth electric capacity, be connected with first port matched resistance between first electric capacity and the input, be connected with first parallel resonance group between first electric capacity and the second electric capacity, still be connected with second parallel resonance group between fifth electric capacity and the sixth electric capacity, still be connected with second port matched resistance between sixth electric capacity and the output, first port matched resistance, first parallel resonance group, second parallel resonance group and second port matched resistance's the other end all ground connection.
The first parallel resonant group comprises a first inductor and a third capacitor which are connected in parallel.
The second parallel resonance group comprises a second inductor and a fourth capacitor which are connected in parallel.
The resonant frequency of the first parallel resonance group and the resonant frequency of the second parallel resonance group are both 433 MHz.
The utility model provides a harmonic high suppression filter for install foretell harmonic high suppression filter circuit, includes the filter shell, and filter shell in-connection has PCB welded plate, is connected with harmonic high suppression filter circuit on the PCB welded plate, should have filter metal covering above the filter shell.
The filter comprises a PCB welding plate, a filter shell and a coaxial cable, wherein a first coaxial connector is connected to the lower portion of the filter shell, a coaxial cable is further connected to one side of the filter shell and is connected with an external electric signal through a second coaxial connector, and the coaxial cable and the first coaxial connector are both connected with an electric signal of a harmonic high-suppression filter circuit on the PCB welding plate.
the beneficial effects of the utility model reside in that 1, first parallel resonance group and second parallel resonance group pass through L C resonance principle, and resonant frequency is at 433MHz, will be higher than or be less than resonant frequency's signal bypass to ground, realize fine filtering characteristic and outband harmonic suppression characteristic.
2. The first port matching resistor and the second port matching resistor are used as port matching impedances, so that the phenomenon that the bypass effect is reduced due to overlarge grounding impedance of the equipment and harmonic waves are coupled to an output end from an input end through a PCB (printed circuit board) stratum is avoided. The situation that harmonic suppression of the instrument is reduced due to overlarge grounding impedance can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of a harmonic high-rejection filter circuit;
FIG. 2 is a schematic diagram of a harmonic high rejection filter;
in the figure, the filter comprises a filter metal cover plate 1, a PCB (printed Circuit Board) welded plate 2, a filter shell 3, a first coaxial connector 4, a coaxial cable 5, a coaxial cable 6, a second coaxial connector, a C1 capacitor, a C2 capacitor, a second capacitor, a C3 capacitor, a third capacitor, a C4 capacitor, a fourth capacitor, a C5 capacitor, a fifth capacitor, a C6 capacitor, a sixth capacitor, a R1 capacitor, a first port matching resistor, a R2 capacitor, a second port matching resistor, a L1 inductor, a first inductor, a L2 inductor and a second inductor.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ example 1 ]
As shown in fig. 1, a harmonic high-rejection filter circuit is characterized in that: the parallel resonant circuit comprises an input end and an output end, a first capacitor C1, a second capacitor C2, a fifth capacitor C5 and a sixth capacitor C6 are sequentially connected in series on a line between the input end and the output end, a first port matching resistor R1 is connected between the first capacitor C1 and the input end, a first parallel resonant group is connected between the first capacitor C1 and the second capacitor C2, a second parallel resonant group is further connected between the fifth capacitor C5 and the sixth capacitor C6, a second port matching resistor R2 is further connected between the sixth capacitor C6 and the output end, and the other ends of the first port matching resistor R1, the first parallel resonant group, the second parallel resonant group and the second port matching resistor R2 are all grounded.
The first capacitor C1, the second capacitor C2, the fifth capacitor C5 and the sixth capacitor C6 are connected in series on a line from the input end to the output end in sequence, the output end of the first port matching resistor R1 is connected with the input end of the first parallel resonance group, and the first parallel resonance group is also grounded.
The input end of the second parallel resonance group is connected between the fifth capacitor C5 and the sixth capacitor C6, and the output end of the second parallel resonance group is grounded.
The input end of the second port matching resistor R2 is connected between the sixth capacitor C6 and the output end, and the output end of the second port matching resistor R2 is grounded.
When the filter is installed in a particular device, the device has excessive ground impedance, which causes reduced bypass and harmonic coupling from the input to the output through the PCB ground. Through the port matching resistors, namely the input end matching resistor-first port matching resistor R1 and the output end matching resistor-second port matching resistor R2, the problem that harmonic suppression of an instrument is reduced due to overlarge grounding impedance can be effectively solved.
[ example 2 ]
as shown in fig. 1, based on embodiment 1, the first parallel resonant group includes a first inductor L1 and a third capacitor C3 connected in parallel.
the second parallel resonant group comprises a second inductor L2 and a fourth capacitor C4 connected in parallel.
The resonant frequency of the first parallel resonance group and the resonant frequency of the second parallel resonance group are both 433 MHz.
by utilizing the parallel resonance of the first inductor L1 and the third capacitor C3, the parallel resonance of the second inductor L2 and the fourth capacitor C4, the resonance frequency of the two capacitors is 433MHz, and according to the principle of infinite parallel resonance impedance, the bypass where the first parallel resonance group and the second parallel resonance group are located can not pass through 433MHz signals.
Meanwhile, when the frequency of the input signal is greater than the resonant frequency, the resonant circuit presents the capacitive property, and when the frequency of the input signal is less than the resonant frequency, the resonant circuit presents the inductive property.
The impedance of the capacitive circuit is calculated by the formula 
，
The capacitive circuit impedance, f the signal frequency, c the capacitance. It can be seen that the higher the frequency f, the lower the capacitive circuit impedance, so that signals above the resonant frequency can be bypassed to ground, increasing their insertion loss.
The impedance of the inductive circuit is calculated as 
，
L is an inductance, and the smaller the frequency, the smaller the inductive circuit impedance, and the signal lower than the resonance frequency can be bypassed to the ground, thereby increasing the insertion loss.
Meanwhile, the first capacitor C1, the second capacitor C2, the fifth capacitor C5 and the sixth capacitor C6 are all dielectric capacitors, and the capacitance values are very small according to the principle that The impedance of the capacitive circuit is calculated by the formula 
It can be seen that, for a given capacitance value, the impedance is higher when the frequency is lower, thereby providing a high impedance for signals smaller than the resonant frequency and increasing the insertion loss of the signals.
And finally, all signals lower than or higher than the resonant frequency, namely 433MHz signals are discharged through the bypass grounding, so that the signals with the resonant frequency of 433MHz are transmitted from the input end to the output end, and the filtering is realized.
[ example 3 ]
As shown in fig. 2, based on embodiment 2, a harmonic high-rejection filter for installing the harmonic high-rejection filter circuit includes a filter housing 3, a PCB welding board 2 is connected in the filter housing 3, the harmonic high-rejection filter circuit is connected on the PCB welding board 2, and a filter metal cover plate 1 is disposed above the filter housing 3.
The filter shell 3 is internally connected with a PCB (printed circuit board) welded plate 2, and the PCB welded plate 2 is connected with the harmonic high-suppression filter circuit described in the embodiment 2.
The filter comprises a filter shell 3, a first coaxial connector 4 is connected to the lower portion of the filter shell 3, a coaxial cable 5 is further connected to one side of the filter shell 3, the coaxial cable 5 is connected with an external electric signal through a second coaxial connector 6, and the coaxial cable 5 and the first coaxial connector 4 are both connected with an electric signal of a harmonic high-suppression filter circuit on a PCB welding plate 2. The first coaxial connector 4 is connected as one signal terminal to an external signal, and the coaxial cable 5 and the second coaxial connector 6 are connected as a second signal terminal to the external signal. For example, the first coaxial connector 4 is electrically connected as a signal input to the input of the harmonic high rejection filter circuit, and the coaxial cable 5 and the second coaxial connector 6 are electrically connected as outputs to the output of the harmonic high rejection filter circuit.
In practice, the specific values of each element can be the values in the following table
Claims (6)
1. A harmonic high-rejection filter circuit, characterized by: including input and output, it has first electric capacity (C1) to establish ties in proper order on the circuit between input to the output, second electric capacity (C2), fifth electric capacity (C5) and sixth electric capacity (C6), be connected with first port matched resistance (R1) between first electric capacity (C1) and the input, be connected with first parallel resonance group between first electric capacity (C1) and second electric capacity (C2), still be connected with second parallel resonance group between fifth electric capacity (C5) and sixth electric capacity (C6), still be connected with second port matched resistance (R2) between sixth electric capacity (C6) and the output, first port matched resistance (R1), first parallel resonance group, the other end of second parallel resonance group and second port matched resistance (R2) is all grounded.
2. the harmonic high-rejection filter circuit according to claim 1, wherein the first parallel resonant group comprises a first inductor (L1) and a third capacitor (C3) connected in parallel.
3. the harmonic high-rejection filter circuit according to claim 1, wherein the second parallel resonance group comprises a second inductor (L2) and a fourth capacitor (C4) connected in parallel.
4. The harmonic high rejection filter circuit of claim 1, wherein: the resonant frequency of the first parallel resonance group and the resonant frequency of the second parallel resonance group are both 433 MHz.
5. A harmonic high-rejection filter for mounting the harmonic high-rejection filter circuit of claim 1, characterized in that: including filter shell (3), filter shell (3) in-connection has PCB welded plate (2), is connected with harmonic high suppression filter circuit on PCB welded plate (2), should have filter metal covering plate (1) above filter shell (3).
6. A harmonic high rejection filter according to claim 5, wherein: the filter is characterized in that a first coaxial connector (4) is connected to the lower portion of the filter shell (3), a coaxial cable (5) is further connected to one side of the filter shell (3), the coaxial cable (5) is connected with an external electric signal through a second coaxial connector (6), and the coaxial cable (5) and the first coaxial connector (4) are both connected with an electric signal of a harmonic high-suppression filter circuit on the PCB welding plate (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438334.8U CN211046888U (en) | 2019-12-30 | 2019-12-30 | Harmonic high-suppression filter circuit and harmonic high-suppression filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438334.8U CN211046888U (en) | 2019-12-30 | 2019-12-30 | Harmonic high-suppression filter circuit and harmonic high-suppression filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211046888U true CN211046888U (en) | 2020-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922438334.8U Active CN211046888U (en) | 2019-12-30 | 2019-12-30 | Harmonic high-suppression filter circuit and harmonic high-suppression filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211046888U (en) |
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2019
- 2019-12-30 CN CN201922438334.8U patent/CN211046888U/en active Active
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