CN209184571U - High low pass harmonic filter - Google Patents
High low pass harmonic filter Download PDFInfo
- Publication number
- CN209184571U CN209184571U CN201822208820.6U CN201822208820U CN209184571U CN 209184571 U CN209184571 U CN 209184571U CN 201822208820 U CN201822208820 U CN 201822208820U CN 209184571 U CN209184571 U CN 209184571U
- Authority
- CN
- China
- Prior art keywords
- low pass
- high low
- circuit
- harmonic filter
- pass harmonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model relates to a kind of high low pass harmonic filters, high low pass harmonic filter circuit including first switch switching circuit with multichannel difference filter range, the high low pass harmonic filter circuit of multichannel is electrically connected with the first switch switching circuit respectively, and first switch switching circuit is then accessed wherein high low pass harmonic filter circuit all the way by triggering；The input impedance of each high low pass harmonic filter circuit in road is identical；The high low pass harmonic filter circuit in every road include power absorption resistance R1, etc. smooth 7 rank Chebyshev's circuits without fluctuating in the 7 rank elliptic function circuits and passband of moire behaviors, the input terminal of the 7 rank elliptic function circuit and 7 rank Chebyshev's circuit connects, the output end of 7 rank Chebyshev's circuits is grounded through power absorption resistance R1, and the output end of 7 rank elliptic function circuits is connected to the output end of filter.
Description
Technical field
The utility model relates to a kind of high low pass harmonic filters.
Background technique
Transmitter in shortwave broadcasting system need to be filtered its electric wave, since shortwave broadcasting system generally has
Multi-Frequency, operating frequency range is wider, therefore the filter circuit of multichannel difference filter range need to be arranged and pass through switch
Switching circuit selectively accesses wherein filter circuit all the way, and in the prior art, the filter circuit of transmitter only has low-pass filtering,
Its harmonic suppression effect is poor, and can not absorb the power of harmonic wave, leads to transmitter job insecurity.
Utility model content
The purpose of this utility model is that aiming at the shortcomings in the prior art, and a kind of high low pass harmonic filter is provided,
The filter harmonic suppression effect is good, and the power of harmonic wave is absorbed.
The purpose of this utility model is achieved through the following technical solutions: high low pass harmonic filter, including first switch are cut
Change high low pass harmonic filter circuit of the circuit with multichannel difference filter range, the high low pass harmonic filter circuit of multichannel respectively with it is described
The electrical connection of first switch switching circuit, first switch switching circuit are then accessed wherein high low pass harmonic electricity all the way by triggering
Road；The input impedance of each high low pass harmonic filter circuit in road is identical；The high low pass harmonic filter circuit in every road includes power
Absorption resistance R1, etc. smooth 7 rank Chebyshev's circuits without fluctuating, institute in the 7 rank elliptic function circuits and passband of moire behaviors
The input terminal for stating 7 rank elliptic function circuits and 7 rank Chebyshev's circuit connects, the output end warp of 7 rank Chebyshev's circuits
Power absorption resistance R1 ground connection, the output end of 7 rank elliptic function circuits are connected to the output end of filter.
Wherein, the input impedance of the high low pass harmonic filter circuit in each road is 50 Ω.
Wherein, the resistance value of the power absorption resistance R1 of the high low pass harmonic filter circuit in each road is 50 Ω.
Wherein, the input terminal of the high low pass harmonic filter circuit of multichannel respectively can with the multiple of first switch switching circuit
Output end is selected to be electrically connected, the input terminal of first switch switching circuit is connected to the input terminal of filter.
Wherein, further include second switch switching circuit, the output end of the high low pass harmonic filter circuit of multichannel respectively with it is described
Multiple optional input terminal electrical connections of second switch switching circuit, the output end of second switch switching circuit are connected to filter
Output end.
Wherein, the switch in the first switch switching circuit and/or second switch switching circuit is specifically relay.
The utility model has the advantages that
The high low pass harmonic filter of the utility model includes first switch switching circuit and multichannel difference filter range
High low pass harmonic filter circuit, the high low pass harmonic filter circuit of multichannel are electrically connected with the first switch switching circuit respectively, the
One switch switching circuit is then accessed wherein high low pass harmonic filter circuit all the way by triggering；Each high low pass harmonic filter circuit in road
Input impedance is identical；The high low pass harmonic filter circuit in every road include power absorption resistance R1, etc. moire behaviors 7 ranks it is ellipse
Smoothly 7 rank Chebyshev's circuits without fluctuating, the 7 rank elliptic function circuit and 7 rank are cut in circular function circuit and passband
Input terminal than avenging husband's circuit connects, and the output end of 7 rank Chebyshev's circuits is grounded through power absorption resistance R1,7 rank ellipse letters
The output end of number circuit is connected to the output end of filter.The utility model passes through 7 rank elliptic function circuits and 7 rank Chebyshevs
Circuit is used cooperatively, so that the harmonic wave of working frequency can not only obtain higher inhibition, and the power of harmonic wave is all logical
Overpower absorption resistance R1 is sponged, and is greatly reduced the reflection power that power amplifier is subjected to, is improved transmitter high power work
Reliability.
Detailed description of the invention
Using attached drawing, the utility model is described in further detail, but the embodiment in attached drawing is not constituted to the utility model
Any restrictions for those of ordinary skill in the art without creative efforts, can also be according to following attached
Figure obtains other attached drawings.
Fig. 1 is the functional block diagram of LC high low pass harmonic filter.
Fig. 2 is the circuit diagram of 7 rank elliptic function low-pass filter circuits.
Fig. 3 is the circuit diagram of 7 rank Chebyshev's high-pass filtering circuits.
Fig. 4 is the circuit diagram of high low pass harmonic filter circuit circuit.
Fig. 5 is the low-pass characteristic curve of the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range.
Fig. 6 is the high pass characteristic curve of the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range.
Fig. 7 is the combined characteristic of the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range.
Fig. 8 is the schematic diagram of the index of the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range.
Specific embodiment
The utility model is further described with the following Examples.
The LC high low pass harmonic filter of the present embodiment be applied to transmitter in, operating frequency range be 3MHz~
30MHz, operating power 2kW are specifically shown in Fig. 1, it includes the high low pass harmonic filter circuit of A1 frequency range (3MHz~
4.4999MHz), the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range, the high low pass harmonic electricity of A3 frequency range
Road (6MHz~7.9999MHz), the high low pass harmonic filter circuit (8MHz~10.9999MHz) of A4 frequency range, the high low pass of A5 frequency range are humorous
Wave filter circuit (11MHz~13.9999MHz), the high low pass harmonic filter circuit (14MHz~17.9999MHz) of A6 frequency range, A7
The high low pass harmonic filter circuit (18MHz~23.9999MHz) of frequency range, the high low pass harmonic filter circuit of A8 frequency range (24MHz~
30MHz) and A9 and A10 relay switching circuit.
The circuit structure of the high low pass harmonic filter circuit of A1~A8 frequency range is identical, filters comprising low-pass filter circuit and high pass
Wave circuit, wherein low-pass filter circuit is using the 7 rank elliptic function circuits in passband with equal moire behaviors as shown in Figure 2；
High-pass filter is using smooth 7 rank Chebyshev's circuits without fluctuating in passband as shown in Figure 3.Pass through simulation calculation, adjustment
The value of first component in parallel of high-pass filtering circuit and low-pass filter circuit input terminal, so that being inputted after two circuit in parallel
Impedance still maintains 50 Ω, to realize the used in parallel of the high low pass harmonic filter circuit of A1~A8 frequency range.Specifically, see Fig. 4,
It is connected to and penetrates through A9 relay switching circuit after the input terminal of the input terminal of high-pass filtering circuit and low-pass filter circuit is connected
Frequency signal input part, 50 Ω power absorption resistance R1 of output termination one end ground connection of high-pass filtering circuit, low-pass filter circuit
Output end be connected to RF signal output.
In upper section, the major function of low-pass filter circuit be so that the frequency of working band with it is low-down decaying pass through,
Frequency outside working band obtains higher inhibition.For example, the high low pass harmonic filter circuit of A2 frequency range (4.5MHz~
The characteristic curve of low-pass filter circuit 5.9999MHz) is designed as shown in figure 5, ripples is waited to rise and fall in its passband by 0.01dB, by
5% deviation is selected in component, so the practical of filter circuit waits the ripples meeting of fluctuating slightly larger, but meets project indicator demand.
The major function of high-pass filter is to give power absorption electricity the secondary or higher hamonic wave of working frequency with lower fading transmission
Hinder R1.Or by taking the high low pass harmonic filter circuit (4.5MHz~5.9999MHz) of A2 frequency range as an example, the spy of high-pass filtering circuit
Linearity curve is as shown in Figure 6.
By being used cooperatively for low-pass filter and high-pass filter so that the harmonic wave of working frequency can not only obtain compared with
High inhibition, and the power of harmonic wave is all passed through power absorption resistance R1 and is sponged, greatly reduce power amplifier be subjected to it is anti-
Power is penetrated, the reliability of transmitter high power work is improved, for example, the high low pass harmonic filter circuit of A2 frequency range (4.5MHz~
Combined characteristic curve 5.9999MHz) is as shown in Figure 7.
Fig. 1, A9 and A10 relay switching circuit are seen by the external low level gating signal provided, and control relay is cut
Relay K1~the K8 changed on circuit is wherein connected all the way, realizes wherein being accessed all the way for A1~A8 frequency range, realizes LC height
The frequency range of logical harmonic filter is optional.The structure of relay K1~K8 is existing skill due to relay switching circuit and thereon
Art is not illustrated and is repeated to it herein.
The high low pass harmonic filter circuit of A1~A8 frequency range realize in frequency range working frequency it is secondary, three times and high order is humorous
Wave is filtered out, is absorbed to reach the harmonics restraint of -50dB, in order to avoid interference is generated to adjacent frequency, while it is logical to avoid Conventional filters
The mode for crossing reflected harmonics inhibits harmonic wave, so that power amplifier be caused to bear biggish reflection power.For example, A2 frequency range height
For the index of logical harmonic filter circuit as shown in figure 8, wherein M1 is the insertion loss of 4.5MHz, M2 is the insertion damage of 5.9999MHz
Consumption, it is passband fluctuation that the value of M2-M1, which takes absolute value, and M3 is that the second harmonic of 4.5MHz inhibits, and M4 is the secondary humorous of 5.9999MHz
Wave inhibits, and M5 is that the triple-frequency harmonics of 4.5MHz inhibits, and M6 is that the triple-frequency harmonics of 5.9999MHz inhibits, it follows that designed finger
Mark fully meets project demand.
The capacitor of the high low pass harmonic filter circuit of A1~A8 frequency range uses the high-power Leaded Ceramic Disc Capacitor of high Q, and every single order
Capacitor is all made of two forms in parallel, to meet the transmission power of 2kW.Inductance is the silver-plated red copper wire coiling that line footpath is 3mm
Air core coil, belong to customed product, wherein the length of the position L1 inductance be 45mm, the position diameter 30mm, L2 and L3 inductance
Length be 30mm, diameter 30mm.A1~A8 frequency range is since the frequency band of work is different, so the inductance and electricity of identical bits number
The value of appearance also can be different, and occurrence is according to actually carrying out adaptation setting.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (6)
1. high low pass harmonic filter,
High low pass harmonic filter circuit including first switch switching circuit with multichannel difference filter range, the high low pass harmonic wave of multichannel
Filter circuit is electrically connected with the first switch switching circuit respectively, and first switch switching circuit is then accessed wherein all the way by triggering
High low pass harmonic filter circuit；
It is characterized in that:
The input impedance of each high low pass harmonic filter circuit in road is identical；High low pass harmonic filter circuit includes function described in every road
Rate absorption resistance R1, etc. smooth 7 rank Chebyshev's circuits without fluctuating in the 7 rank elliptic function circuits and passband of moire behaviors,
The input terminal of the 7 rank elliptic function circuit and 7 rank Chebyshev's circuit connects, the output end of 7 rank Chebyshev's circuits
It is grounded through power absorption resistance R1, the output end of 7 rank elliptic function circuits is connected to the output end of filter.
2. high low pass harmonic filter according to claim 1, it is characterized in that: the high low pass harmonic filter circuit in each road is defeated
Entering impedance is 50 Ω.
3. high low pass harmonic filter according to claim 2, it is characterized in that: the function of the high low pass harmonic filter circuit in each road
The resistance value of rate absorption resistance R1 is 50 Ω.
4. high low pass harmonic filter according to claim 1, it is characterized in that: the high low pass harmonic filter circuit of multichannel is defeated
Enter end to be electrically connected with multiple optional output ends of the first switch switching circuit respectively, the input terminal of first switch switching circuit
It is connected to the input terminal of filter.
5. high low pass harmonic filter according to claim 4, it is characterized in that: further include second switch switching circuit, it is more
The output end of the high low pass harmonic filter circuit in road is electrically connected with multiple optional input terminals of the second switch switching circuit respectively,
The output end of second switch switching circuit is connected to the output end of filter.
6. high low pass harmonic filter according to claim 5, it is characterized in that: the first switch switching circuit and/or
Switch in second switch switching circuit is specifically relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822208820.6U CN209184571U (en) | 2018-12-26 | 2018-12-26 | High low pass harmonic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822208820.6U CN209184571U (en) | 2018-12-26 | 2018-12-26 | High low pass harmonic filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209184571U true CN209184571U (en) | 2019-07-30 |
Family
ID=67377886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822208820.6U Active CN209184571U (en) | 2018-12-26 | 2018-12-26 | High low pass harmonic filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209184571U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
-
2018
- 2018-12-26 CN CN201822208820.6U patent/CN209184571U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
| CN116683882B (en) * | 2023-06-06 | 2023-12-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102684633B (en) | There is device and the band pass filter wherein of at least three transmission zeros | |
| CN110429604B (en) | Multistage strong electromagnetic pulse protection power filter | |
| CN104112889A (en) | Wideband bandstop high-selectivity filter | |
| CN209184571U (en) | High low pass harmonic filter | |
| CN205142152U (en) | High -power band pass filter | |
| CN209658373U (en) | A kind of low intermodulation wideband two-way combiner | |
| CN204408289U (en) | The hand-held frequency spectrograph of shortwave | |
| CN110729978A (en) | High-frequency common mode rejection circuit and electrical apparatus | |
| CN209120148U (en) | A kind of power-supply filter of antistatic protection | |
| CN107689782B (en) | Filter for inhibiting second harmonic | |
| CN106454190A (en) | Band-pass filter having high out-of-band rejection of broad band | |
| CN214798045U (en) | Connector interface processing circuit and two circuit board devices | |
| CN211656211U (en) | On-vehicle CVBS composite video signal keeps apart filter circuit | |
| CN114124028A (en) | Combination filter circuit and combination filter device | |
| CN207251567U (en) | There is the wave filter that second harmonic suppresses | |
| CN105490657A (en) | A high-power band-pass filter | |
| CN209497433U (en) | A kind of absorption-type low-pass filter | |
| CN207039550U (en) | A kind of anti-interference low bit error wave filter | |
| CN207835421U (en) | Double frequency LC filter circuits | |
| CN207283512U (en) | Difference filter | |
| CN207869198U (en) | A kind of low-frequency filter using magnetic bead as HF switch | |
| CN207460112U (en) | LC low-pass filters | |
| CN105743461A (en) | Filtering circuit, radio frequency anti-jamming circuit and radio frequency signal generating circuit | |
| CN105322907A (en) | A duplexing filter circuit and an implementation method | |
| CN205039788U (en) | A multichannel wave filter and digital microwave transmission equipment for digital microwave transmission equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |