CN101677232A - Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof - Google Patents
Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof Download PDFInfo
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- CN101677232A CN101677232A CN200810211300A CN200810211300A CN101677232A CN 101677232 A CN101677232 A CN 101677232A CN 200810211300 A CN200810211300 A CN 200810211300A CN 200810211300 A CN200810211300 A CN 200810211300A CN 101677232 A CN101677232 A CN 101677232A
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- magnetic core
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- core inductance
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Abstract
The invention relates to a band elimination filter capable of eliminating harmonic waves and a related satellite signal receiver thereof. Concretely, the band elimination filter capable of eliminatingthe harmonic waves comprises a first signal terminal, a second signal terminal, a high-pass filter and a low-pass filter, wherein the high-pass filter is coupled between the first signal terminal andthe second signal terminal and is used for carrying out high-pass filtering on signals transmitted between the first signal terminal and the second signal terminal; and the low-pass filter is coupledbetween the first signal terminal and the second signal terminal and is used for carrying out low-pass filtering on signals transmitted between the first signal terminal and the second signal terminal. The low-pass filter comprises a plurality of non-magnetic core inductors and a plurality of capacitors, wherein the plurality of non-magnetic core inductors are connected in series between the first signal terminal and the second signal terminal into a sequence; and the plurality of capacitors are respectively coupled between the non-magnetic core inductors adjacent to a first non-magnetic coreinductor and a second non-magnetic core inductor and a grounding terminal. Through the band elimination filter of the invention, the satellite signal receiver can ensure the communication quality ofhome networks.
Description
Technical field
But the present invention relates to a kind of band stop filter and related satellite signal receiver thereof of harmonic carcellation, relate in particular to and a kind ofly avoid magnetic saturation to produce band stop filter and the related satellite signal receiver thereof of nonlinear Harmonic Interference signal to guarantee communication quality.
Background technology
The purpose of filter is the signal by special frequency band, decay all signals beyond this frequency band can divide four kinds of low pass filter (Low Pass Filter), high pass filter (High Pass Filter), band pass filter (Band PassFilter) and band stop filters (Band Rejection Filter) etc. according to its function.Wherein, but therefore the signal of band stop filter filtering special frequency band is usually used in the communication system by high and low frequency band transmission signals, as satellite signal receiver.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a satellite signal receiver 10.Satellite signal receiver 10 is a superheterodyne receiver, and it is made up of an antenna 100, a frequency demultiplier 102 and a set-top box 104 briefly.But antenna 100 receiving satellite signals after frequency demultiplier 102 is reduced to intermediate frequency, carry out subsequent treatment by set-top box 104.The signal path that frequency demultiplier 102 and set-top box are 104 is formed by a cable 106, in other words, cable 106 needs to transmit: set-top box 104 offers DC power supply (its frequency is 0), frequency demultiplier 102 and 104 two-way frequency shift keyings of set-top box of frequency demultiplier 102, and (Frequency Shift Keying, FSK) communicate by letter employed signal (its frequency is 2.3MHz) and frequency demultiplier 102 exports the intermediate-freuqncy signal (its frequency be 250 to 2150MHz) of set-top box 104 to.Under general the application, cable 106 can transmit DC power supply and coherent signal effectively, is able to normal operation to guarantee frequency demultiplier 102 and set-top box 104.Yet, in some cases, as a plurality of set-top box 104 to each other by home-network linkups, cable 106 may influence the communication quality of home network, its main cause is: the devices such as direct current transducer, crystal oscillator and fsk modulator in the frequency demultiplier 102, in operation, leakage signal may be produced, when leakage signal drops in the frequency band of home network 4 to 100MHz, the communication quality of home network will be influenced.In this case, must add a band stop filter, and its cutoff frequency band is at least 4 to 100MHz at frequency demultiplier 102 and set-top box 104 (they being on the cable 106), and may be with the filtering leakage signal to the influence that home network was produced.
In known technology, the implementation of band stop filter has many kinds, and modal is exactly in conjunction with a high pass filter and a low pass filter.Please refer to Fig. 2 A and Fig. 2 B, Fig. 2 A is the schematic diagram that is applicable to the band stop filter 20 on the cable 106 among Fig. 1, and Fig. 2 B is the frequency response schematic diagram of band stop filter 20.Shown in Fig. 2 A, band stop filter 20 comprises a high pass filter 200 and a low pass filter 202.In addition, shown in Fig. 2 B, the higher cutoff frequency F of high pass filter 200
HNeed with filtering HF leakage signal, and to guarantee that the intermediate-freuqncy signal that frequency demultiplier 102 is exported can be sent to set-top box 104 greater than 100MHz and less than 250MHz; And the minimum cutoff F of low pass filter 202
LNeed with filtering low frequency leakage signal, and to guarantee that DC power supply and two-way frequency shift keyed signals can normally transmit greater than 2.3MHz and less than 4MHz.Low pass filter 202 is made up of inductance and electric capacity usually, and considers that based on cost and size inductance adopts coil type magnetic core inductance more.Yet, because the power requirements of the frequency shift keyed signals of 2.3MHz is-4dBm, when this high power signals is passed through coil type magnetic core inductance, can make the magnetic core internal magnetic field saturated and produce nonlinear interaction, produce the harmonic wave (Harmonics) of 2.3MHz on the contrary, as signals such as 4.6MHz, 6.9MHz, 9.2MHz..., it just drops in the frequency band of home network 4 to 100MHz, thereby the communication quality of home network is impacted.
Summary of the invention
Therefore, but main purpose of the present invention promptly is to provide a kind of band stop filter and related satellite signal receiver thereof of harmonic carcellation.
But the present invention discloses a kind of band stop filter of harmonic carcellation, includes one first signal end; One secondary signal end; One high pass filter is coupled between this first signal end and this secondary signal end, is used for the signal that transmits between this first signal end and this secondary signal end is carried out high-pass filtering; And a low pass filter, be coupled between this first signal end and this secondary signal end, be used for the signal that transmits between this first signal end and this secondary signal end is carried out low-pass filtering.This low pass filter includes a plurality of non-magnetic core inductance, for being serially connected with the sequence between this first signal end and this secondary signal end; And a plurality of electric capacity, be respectively coupled between the adjacent non-magnetic core inductance and a ground end of these a plurality of non-magnetic core inductance.
The present invention also discloses a kind of satellite signal receiver, includes an antenna, is used for receiving a radiofrequency signal; One frequency demultiplier is coupled to this antenna, is used for the frequency of this radiofrequency signal is reduced to a predeterminated frequency, to export an intermediate-freuqncy signal; One set-top box is used for handling this intermediate-freuqncy signal, and controls the running of this frequency demultiplier; And a band stop filter, be used for harmonic carcellation.This band stop filter includes one first signal end, is coupled to this frequency demultiplier; One secondary signal end is coupled to this set-top box; One high pass filter is coupled between this first signal end and this secondary signal end, is used for the signal that transmits between this first signal end and this secondary signal end is carried out high-pass filtering; And a low pass filter, be coupled between this first signal end and this secondary signal end, be used for the signal that transmits between this first signal end and this secondary signal end is carried out low-pass filtering.This low pass filter includes a plurality of non-magnetic core inductance, for being serially connected with the sequence between this first signal end and this secondary signal end; And a plurality of electric capacity, be respectively coupled between the adjacent non-magnetic core inductance and a ground end of these a plurality of non-magnetic core inductance.
In the present invention, the low pass filter in the band stop filter can avoid magnetic saturation to produce nonlinear Harmonic Interference signal, to guarantee communication quality.Therefore, by band stop filter of the present invention, satellite signal receiver can be guaranteed the communication quality of home network.
Description of drawings
Fig. 1 is the schematic diagram of a satellite signal receiver.
Fig. 2 A is the schematic diagram that is applicable to the band stop filter on the cable among Fig. 1.
Fig. 2 B is the frequency response schematic diagram of the band stop filter of Fig. 2 A.
Fig. 3 is the schematic diagram according to the band stop filter that one embodiment of the invention proposed.
Fig. 4 is the schematic diagram of alternate embodiment of the band stop filter of Fig. 3.
Fig. 5 is applied to the schematic diagram of the satellite signal receiver of Fig. 1 for the band stop filter of Fig. 3.
The primary clustering symbol description:
10 satellite signal receivers
100 antennas
102 frequency demultipliers
104 set-top box
106 cables
20,30 band stop filters
200,300 high pass filters
202,302 low pass filters
F
L, F
HCut-off frequency
T_in, T_out signal end
C
H1～C
H (M+1), C
L1～C
LN, C
LS1～C
LS (N-1)Electric capacity
L
H1～L
HM, L
S1, L
S2, L
L1～L
L (N-1)Inductance
Embodiment
Please refer to Fig. 3, Fig. 3 is the schematic diagram according to the band stop filter 30 that one embodiment of the invention proposed.Band stop filter 30 preferably is applied in the satellite signal receiver 10 of Fig. 1, and is arranged at 104 of frequency demultiplier 102 and set-top box, in order to harmonic carcellation.Band stop filter 30 includes signal end T_in, T_out, a high pass filter 300 and a low pass filter 302.High pass filter 300 includes capacitor C
H1～C
H (M+1)And inductance L
H1～L
HMCapacitor C
H1～C
H (M+1)For being serially connected with the sequence between signal end T_in and T_out, and inductance L
H1～L
HMThen be respectively coupled to capacitor C
H1～C
H (M+1)In between two adjacent electric capacity and the ground end.Low pass filter 302 includes inductance L
S1, L
S2, L
L1～L
L (N-1)And capacitor C
L1～C
LNInductance L
S1, L
L1～L
L (N-1)And L
S2For being serially connected with the sequence between signal end T_in and T_out, and capacitor C
L1～C
LNThen be respectively coupled to inductance L
S1, L
L1～L
L (N-1)And L
S2In between two adjacent inductance and the ground end.
That pays special attention to is inductance L
S1, L
L1～L
L (N-1)And L
S2Be all non-magnetic core inductance, as ceramic core (Ceramic Core) inductance or air-core (Air Core) inductance.In addition, preferably, inductance L
S1With L
S2Inductance value identical (nH level) and less than inductance L
L1～L
L (N-1)Inductance value (uH level).In other words, be coupled to the inductance L of signal end T_in and T_out
S1With L
S2Inductance value less, can allow the low frequency signal of 2.3MHz pass through, but stop 250 to 2150MHz high-frequency signal, thus isolated inductance L
L1～L
L (N-1)Influence to intermediate-freuqncy signal.Therefore, low pass filter 302 can reduce the influence to intermediate-freuqncy signal, keeps the low insertion loss response of band stop filter 30 in the intermediate frequency frequency range.
In addition, in order to strengthen the usefulness of low pass filter 302, make its performance that " precipitous " arranged more in frequency response, the present invention in addition can be as shown in Figure 4, with capacitor C
LS1～C
LS (N-1)Respectively with inductance L
L1～L
L (N-1)And connect.Thus, pass through capacitor C
LS1～C
LS (N-1)Auxiliary, low pass filter 302 can promote (shown in the 2nd figure) minimum cutoff F
LThe frequency cutoff effect, with the usefulness of further lifting band stop filter 30.
Please continue with reference to figure 5, Fig. 5 is applied to the schematic diagram of the satellite signal receiver 10 of Fig. 1 for band stop filter 30 of the present invention.Band stop filter 30 is arranged at frequency demultiplier 102 and 104 of set-top box (being on the cable 106), and the running of antenna 100, frequency demultiplier 102 and set-top box 104 can not given unnecessary details at this with reference to above stated specification.In Fig. 5, but the signal of band stop filter 30 filterings 4 to 100MHz, to avoid influencing the communication quality of home network, simultaneously, low pass filter 302 uses non-magnetic core inductance, can further not guarantee the communication quality of home network because of magnetic saturation produces nonlinear Harmonic Interference signal.In addition, in low pass filter 302, inductance L
S1With L
S2Inductance value less, can allow the low frequency signal of 2.3MHz pass through, and isolated inductance L
L1～L
L (N-1)To the influence of intermediate-freuqncy signal, thereby can keep the low insertion loss response of band stop filter 30 in the intermediate frequency frequency range.Certainly, also can increase capacitor C as shown in Figure 4
LS1～C
LS (N-1), to strengthen the usefulness of low pass filter 302.
In sum, in the present invention, the low pass filter in the band stop filter uses non-magnetic core inductance, can avoid magnetic saturation to produce nonlinear Harmonic Interference signal, to guarantee communication quality.Therefore, by band stop filter of the present invention, satellite signal receiver can be guaranteed the communication quality of home network.
The above only is preferred embodiment of the present invention, and all equivalent variations and modifications of being done according to claims scope of the present invention all should belong to covering scope of the present invention.
Claims (15)
1. but the band stop filter of a harmonic carcellation comprises:
One first signal end;
One secondary signal end;
One high pass filter is coupled between described first signal end and described secondary signal end, is used for the signal that transmits between described first signal end and described secondary signal end is carried out high-pass filtering; And
One low pass filter is coupled between described first signal end and described secondary signal end, is used for the signal that transmits between described first signal end and described secondary signal end is carried out low-pass filtering, and described low pass filter comprises:
A plurality of non-magnetic core inductance are for being serially connected with the sequence between described first signal end and described secondary signal end; And
A plurality of electric capacity are respectively coupled between the adjacent non-magnetic core inductance and a ground end of described a plurality of non-magnetic core inductance.
2. band stop filter as claimed in claim 1, the inductance value that is coupled to one first non-magnetic core inductance of described first signal end and described secondary signal end and one second non-magnetic core inductance in wherein said a plurality of non-magnetic core inductance are all less than the inductance value of other non-magnetic core inductance.
3. band stop filter as claimed in claim 2, the wherein said first non-magnetic core inductance is identical with the inductance value of the described second non-magnetic core inductance.
4. band stop filter as claimed in claim 2, wherein said low pass filter also comprises:
A plurality of electric capacity are connected to the first non-magnetic core inductance described in described a plurality of non-magnetic core inductance and the described second non-magnetic core inductance other non-magnetic core inductance in addition respectively.
5. band stop filter as claimed in claim 1, wherein said a plurality of non-magnetic core inductance are all the ceramic core inductance.
6. band stop filter as claimed in claim 1, wherein said a plurality of non-magnetic core inductance are all the air-core inductance.
7. band stop filter as claimed in claim 1, wherein said high pass filter comprises:
A plurality of electric capacity are for being serially connected with the sequence between described first signal end and described secondary signal end; And
A plurality of inductance are respectively coupled between the adjacent capacitor and described the end of described a plurality of electric capacity.
8. band stop filter as claimed in claim 1, it is used between a satellite signal receiver one frequency mixer and the set-top box.
9. satellite signal receiver comprises:
One antenna is used for receiving satellite signal;
One frequency demultiplier is coupled to described antenna, is used for reducing the frequency of the satellite-signal that described antenna receives, to export an intermediate-freuqncy signal;
One set-top box is used for handling described intermediate-freuqncy signal, and controls the running of described frequency demultiplier; And
One band stop filter is used for harmonic carcellation, and described band stop filter comprises:
One first signal end is coupled to described frequency demultiplier;
One secondary signal end is coupled to described set-top box;
One high pass filter is coupled between described first signal end and described secondary signal end, is used for the signal that transmits between described first signal end and described secondary signal end is carried out high-pass filtering; And
One low pass filter is coupled between described first signal end and described secondary signal end, is used for the signal that transmits between described first signal end and described secondary signal end is carried out low-pass filtering, and described low pass filter comprises:
A plurality of non-magnetic core inductance are for being serially connected with the sequence between described first signal end and described secondary signal end; And
A plurality of electric capacity are respectively coupled between the adjacent non-magnetic core inductance and a ground end of described a plurality of non-magnetic core inductance.
10. satellite signal receiver as claimed in claim 9, the inductance value that is coupled to one first non-magnetic core inductance of described first signal end and described secondary signal end and one second non-magnetic core inductance in wherein said a plurality of non-magnetic core inductance are all less than the inductance value of other non-magnetic core inductance.
11. satellite signal receiver as claimed in claim 10, the wherein said first non-magnetic core inductance is identical with the inductance value of the described second non-magnetic core inductance.
12. satellite signal receiver as claimed in claim 10, wherein said low pass filter also comprises:
A plurality of electric capacity are connected to the first non-magnetic core inductance described in described a plurality of non-magnetic core inductance and the described second non-magnetic core inductance other non-magnetic core inductance in addition respectively.
13. satellite signal receiver as claimed in claim 9, wherein said a plurality of non-magnetic core inductance are all the ceramic core inductance.
14. satellite signal receiver as claimed in claim 9, wherein said a plurality of non-magnetic core inductance are all the air-core inductance.
15. satellite signal receiver as claimed in claim 9, wherein said high pass filter comprises:
A plurality of electric capacity are for being serially connected with the sequence between described first signal end and described secondary signal end; And
A plurality of inductance are respectively coupled between the adjacent capacitor and described the end of described a plurality of electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102113009A CN101677232B (en) | 2008-09-17 | 2008-09-17 | Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102113009A CN101677232B (en) | 2008-09-17 | 2008-09-17 | Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof |
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| Publication Number | Publication Date |
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| CN101677232A true CN101677232A (en) | 2010-03-24 |
| CN101677232B CN101677232B (en) | 2012-05-23 |
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| CN2008102113009A Active CN101677232B (en) | 2008-09-17 | 2008-09-17 | Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542783A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current testing device for CVT secondary voltage testing device |
| CN112702059A (en) * | 2020-12-11 | 2021-04-23 | 兰州空间技术物理研究所 | Frequency synthesizer for cesium atomic clock |
| CN113484579A (en) * | 2021-06-16 | 2021-10-08 | 深圳供电局有限公司 | Magnetic saturation characteristic determination method and device, computer equipment and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6437554B1 (en) * | 1999-11-19 | 2002-08-20 | The United States Of America As Represented By The Secretary Of The Interior | High current measurement system incorporating an air-core transducer |
| CN1472889A (en) * | 2002-08-02 | 2004-02-04 | 百一电子股份有限公司 | Multiplexer of ceramic filter piled satellite spectrum reducer |
| CN200987146Y (en) * | 2006-12-25 | 2007-12-05 | 深圳市同洲电子股份有限公司 | Duplex filter and printed circuit boards having the same |
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2008
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542783A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current testing device for CVT secondary voltage testing device |
| CN112702059A (en) * | 2020-12-11 | 2021-04-23 | 兰州空间技术物理研究所 | Frequency synthesizer for cesium atomic clock |
| CN113484579A (en) * | 2021-06-16 | 2021-10-08 | 深圳供电局有限公司 | Magnetic saturation characteristic determination method and device, computer equipment and storage medium |
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| Publication number | Publication date |
|---|---|
| CN101677232B (en) | 2012-05-23 |
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