CN206341311U - A kind of low pass filter and LNB module - Google Patents
A kind of low pass filter and LNB module Download PDFInfo
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- CN206341311U CN206341311U CN201621160935.7U CN201621160935U CN206341311U CN 206341311 U CN206341311 U CN 206341311U CN 201621160935 U CN201621160935 U CN 201621160935U CN 206341311 U CN206341311 U CN 206341311U
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- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000003780 insertion Methods 0.000 claims description 12
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- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 5
- 238000009432 framing Methods 0.000 claims description 5
- 230000001629 suppression Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000003672 processing method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/455—Demodulation-circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Structure Of Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The utility model discloses a kind of low pass filter being used in LNB modules and LNB modules, the LNB modules include LNB circuits and satellite positioning circuitry, the passband frequency range of the low pass filter is 950MHz to 1450MHz, the rejection frequency scope of the low pass filter is 1560MHz to 1616MHz, the low pass filter input connects LNB circuits, wideband direct broadcast satellite TV signal after low pass filter processing is exported with the satellite positioning signal combining after being handled through the satellite positioning circuitry, the low pass filter by LTCC wave filter groups into.In the utility model embodiment, GNSS satellite navigation signal, which can be effectively ensured, to be disturbed by wideband direct broadcast satellite TV signal.
Description
Technical field
The utility model is related to a kind of wideband direct broadcast satellite TV tuner, and in particular to a kind of low pass filter and LNB module
And signal processing method.
Background technology
With the development of information technology, direct broadcast television satellite tuner is greatly promoted in rural areas, but due to
Market mountain vallage machine, flight data recorder are more and more, and the box for even more having country to call for bid is brought into city and used, and there is line number impact locality
The market of word machine top box, causes confusion to market and management.Thus General Bureau of Radio, Film and Television, which is proposed to have, receives the live of GNSS signal
The product of telstar tuner, its final purpose be to broadcasting and TV in every family general family provide meet its technical need, it is stable,
High-quality, inexpensive product, satisfactory product and service are provided to client.
The effect of LNB modules with positioning function is：The wideband direct broadcast satellite TV signal of Ku wave bands can not only be received, is passed through
It is amplified, combining, filtering, down coversion and intermediate frequency amplification etc. signal transacting, then export wideband direct broadcast satellite TV signal
Intermediate-freuqncy signal 950MHz~1450MHz；And GNSS signal can be received simultaneously, and the GNSS signal received is filtered
Ripple, amplification；Finally, DVB or set top box solution will be sent to after direct broadcast television satellite intermediate-freuqncy signal and GNSS signal combining
Adjust.
In order to prevent that direct broadcast television satellite signal from being disturbed by inband signaling, selectable GNSS signal can be defended for the Big Dipper
Star navigation signal centre frequency is 1561.098MHz B1 frequency band signals, or gps satellite signal centre frequency is
1575.42MHz L1 frequency band signals or GLONASS signal band limits are believed for 1602MHz+0.5625MHz*K L1 frequency ranges
Number etc., wherein K=1~24.
LNB modules with positioning function are to be believed direct broadcast television satellite intermediate-freuqncy signal and GNSS by a coaxial wire
DVB or set top box demodulation are sent to after number combining.It will now need to carry out alien frequencies conjunction on direct broadcast television satellite tuner
The design of road device.The main Out-of-band rejection ratio for seeing two paths of quality of pilot frequency combiner performance, insertion loss, standing-wave ratio and with interior
Fluctuation.Device frequency-selecting design and combining are filtered using discrete component in the typical design, this method for designing is complicated, and member
Part insertion loss causes pass-band loss big than larger.
Using the pilot frequency combiner of microstrip design, due to direct broadcast television satellite intermediate-freuqncy signal and GNSS signal wavelength compared with
Long, quarter-wave will will now add the size of printed circuit board (PCB), cause into more than 20 millimeters on a printed circuit
This increase.Or be the pilot frequency combiner for using pilot frequency combiner integrated chip, integrated chip price general charged is somewhat expensive, will lead
Causing cost will increase.
Because the frequency interval of tv-if signal and Big Dipper satellite signal is close, therefore realization is " with outer high rejection ratio "
The key of whole radio frequency path design.Under the premise of LNB circuit sizes are less, the wave filter using discrete LC components is difficult
Realize this " with outer high rejection ratio " wave filter (squareness factor of wave filter is poor)；Because to realize the " band of wave filter
Outer high rejection ratio " performance, it is necessary to increase the exponent number of LC wave filters, can so increase the component numbers such as electric capacity, inductance；While by
In the influence of component precision, skew will be produced in the passband of high volume production process median filter and the frequency of stopband, so that shadow
Ring wideband direct broadcast satellite TV signal and Big Dipper satellite signal.Sum it up, under limited circuit space size, first device is separated based on LC
The wave filter of part will make wideband direct broadcast satellite TV intermediate-freuqncy signal disturb GNSS satellite navigation signal, so as to cause the DVB can not
Normal rating and positioning.
Utility model content
The purpose of this utility model be suppress for above-mentioned problem there is provided one kind high stop band, frequency it is accurate
Stable wave filter so that GNSS satellite navigation signal will not be disturbed by wideband direct broadcast satellite TV signal, so as to allow satellite reception
The normal rating of machine and positioning, and corresponding LNB tuners and signal processing method are provided.
In order to realize the purpose of this utility model, the utility model provides a kind of low pass filter being used in LNB modules,
The LNB modules include LNB circuits and satellite positioning circuitry, and the passband frequency range of the low pass filter arrives for 950MHz
1450MHz, the rejection frequency scope of the low pass filter is 1560MHz to 1616MHz, and the low pass filter input connects
Connect LNB circuits, the wideband direct broadcast satellite TV signal after the low pass filter processing with handled through the satellite positioning circuitry after
Satellite positioning signal combining is exported.
The low pass filter is made up of two LTCC filters in series；Or the low pass filter is by a discrete LC
Component low pass filter and a LTCC filters in series composition.
The pass band insertion signal is less than 5dB, and input vswr and output VSWR are less than 1.8,
Suppression scope at 1560MHz~1580MHz is in 38dB to 60dB.
The satellite positioning signal that the satellite positioning circuitry is received is big-dipper satellite framing signal.
Accordingly, the utility model additionally provides a kind of LNB modules including low pass filter.
Accordingly, the utility model additionally provides a kind of signal processing method applied to LNB, and the LNB, which has, to be received
The function of satellite positioning signal and wideband direct broadcast satellite TV signal, the step includes：
The wideband direct broadcast satellite TV signal that will be received by LNB circuits, 1560MHz to 1616MHz models are filtered by low pass filter
The signal enclosed；Again by the wideband direct broadcast satellite TV signal after low pass filter is handled and satellite positioning signal after treatment
It is combined output.
Methods described also includes：
Wideband direct broadcast satellite TV signal is received, the two-stage LNA circuits that the wideband direct broadcast satellite TV signal is passed through in LNB circuits
It is amplified processing；
It is filtered by image-reject filter；
Down coversion and intermediate frequency enhanced processing are carried out by down coversion and IF amplifier circuit, the direct broadcasting satellite electricity after by processing
Inputted depending on signal to low pass filter.
Methods described also includes：
Receive satellite positioning signal of the signal frequency range in 1560MHz to 1616MHz；
Processing is amplified by the two-stage LNA circuits in satellite positioning circuitry.
Methods described also includes：
Satellite positioning signal is filtered based on SAW filter；
It is described that step is filtered to satellite positioning signal in satellite positioning signal by two-stage LNA based on SAW filter
Carry out, or carried out in satellite positioning signal after first order LNA circuits after circuit amplification.
Combining is inputted to pilot frequency combiner after treatment for the satellite positioning signal and wideband direct broadcast satellite TV signal, then by
Pilot frequency combiner combining is exported to set top box or DVB.
Described exported by pilot frequency combiner combining to set top box or DVB includes：
Based on the separating component match circuit in pilot frequency combiner by F combining output matchings to 75 Ohms systems.
After scheme above, the beneficial effects of the utility model include：
1st, the LTCC wave filters squareness factor for the direct broadcasting satellite signal transacting link rear end that the utility model is related to is good, stopband
Suppress, GNSS satellite navigation signal, which can be effectively ensured, to be disturbed by wideband direct broadcast satellite TV signal.
2nd, the LTCC filter passband insertion loss for the direct broadcasting satellite signal transacting link rear end that the utility model is related to is small,
Port standing-wave ratio is good so that signal transmission performance is good.
3rd, the LTCC filter frequencies for the direct broadcasting satellite signal transacting link rear end that the utility model is related to are precise and stable, body
Product is small, and production paster technique is simple, it is ensured that the quality of product, while simplifying circuit design, improves production efficiency.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the signal transacting of the direct broadcasting satellite tuner (LNB) with navigation/positioning function in the utility model embodiment
Schematic flow sheet；
Fig. 2 is pilot frequency combiner modular circuit schematic diagram in the utility model embodiment；
Fig. 3 is the circuit theory diagrams of low pass filter first embodiment in the utility model embodiment；
Fig. 4 is the circuit theory diagrams of low pass filter second embodiment in the utility model embodiment；
Fig. 5 is that the insertion loss S21 of low pass filter in pilot frequency combiner modular circuit in the utility model embodiment is surveyed
Test result figure；
Fig. 6 is the input vswr test result of low pass filter in pilot frequency combiner modular circuit in the utility model
Figure；
Fig. 7 is the output VSWR test result of low pass filter in pilot frequency combiner modular circuit in the utility model
Figure；
Fig. 8 is the insertion loss S21 test results of SAW filter in pilot frequency combiner modular circuit in the utility model
Figure；
Fig. 9 is the input vswr of SAW filter and output standing wave in pilot frequency combiner modular circuit in the utility model
Than test result figure；
Figure 10 is SAW filter placement second level amplifier circuit in low noise (LNA) position signal afterwards in the utility model
Figure；
Figure 11 is SAW filter placement first order amplifier circuit in low noise (LNA) position signal afterwards in the utility model
Figure；
Figure 12 is the path combining of pilot frequency combiner module two output use vertical mode schematic diagram in the utility model；
Figure 13 is the path combining of pilot frequency combiner module two output use relative mode schematic diagram in the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The all other embodiment obtained, belongs to the scope of the utility model protection.
The low pass filter being used in LNB modules involved by the utility model embodiment, the LNB modules include LNB electricity
Road and satellite positioning circuitry, the passband frequency range of the low pass filter is 950MHz to 1450MHz, and low pass filter is filtered
Frequency range is 1560MHz to 1616MHz, and low pass filter input connection LNB circuits are live after low pass filter processing
Satellite TV signal is exported with the satellite positioning signal combining after being handled through satellite positioning circuitry.Low pass filter is by two LTCC
Filters in series is constituted；Or the low pass filter is by a discrete LC components low pass filter and a LTCC wave filter
It is composed in series.
The signal processing method applied to LNB involved by the utility model embodiment, the LNB, which has, receives satellite fix
The function of signal and wideband direct broadcast satellite TV signal, the LNB has the work(for receiving satellite positioning signal and wideband direct broadcast satellite TV signal
Can, in the process, the wideband direct broadcast satellite TV signal that LNB circuits are received, by low pass filter filter 1560MHz to
The signal of 1616MHz scopes；Again by the wideband direct broadcast satellite TV signal after low pass filter is handled and defending after treatment
Star framing signal is combined output.
It is embodied in implementation process, wideband direct broadcast satellite TV processing procedure includes in LNB：Receive wideband direct broadcast satellite TV letter
Number, the two-stage LNA circuits that the wideband direct broadcast satellite TV signal passes through in LNB circuits are amplified processing；Suppressed by mirror image
Wave filter is filtered；Down coversion and intermediate frequency enhanced processing are carried out by down coversion and IF amplifier circuit, it is straight after by processing
Satellite TV signal is broadcast to input to low pass filter；The wideband direct broadcast satellite TV signal that LNB circuits are received, is filtered by low pass filter
Except the signal of 1560MHz to 1616MHz scopes；Again by the wideband direct broadcast satellite TV signal after low pass filter is handled with passing through
Satellite positioning signal after processing is combined output.
In specific implementation process, LNB module Satellite framing signal processing procedures include：Signal frequency range is received to exist
1560MHz to 1616MHz satellite positioning signal；Processing is amplified by the two-stage LNA circuits in satellite positioning circuitry.
During this, also relate to and satellite positioning signal is filtered based on SAW filter；Based on SAW filter to satellite
Position signal is filtered step and carried out in satellite positioning signal after the amplification of two-stage LNA circuits, or in satellite positioning signal
Carried out after first order LNA circuits.
In specific implementation process, satellite positioning signal and the combining after treatment of wideband direct broadcast satellite TV signal are inputted to alien frequencies
Combiner, then exported by pilot frequency combiner combining to set top box or DVB.Exported by pilot frequency combiner combining to machine
Top box or DVB include：Based on the separating component match circuit in pilot frequency combiner by F combining output matchings
To 75 Ohms systems.
The utility model is further illustrated below with reference to the accompanying drawings, referring to figs. 1 to Figure 13.
As shown in figure 1, direct broadcasting satellite tuner (LNB) antenna with navigation/positioning function receives GNSS satellite positioning
Signal frequency is 1560MHz~1580MHz, and signal characteristic is the spread-spectrum signal using pseudorandom sequence modulates, the integration of signal
Noise intensity is about -110dBm；Then first order low-noise amplifier (LNA) circuit and second level low-noise amplifier are passed through
(LNA) circuit is amplified processing, and link overall gain is about 33dB, and the signal intensity finally exported is about -77dBm.
As shown in figure 1, signal intensity is about -123dBm, satellite tv antenna when wideband direct broadcast satellite TV signal reaches ground
Gain be about 13dB, the signal intensity for being fed into the direct broadcasting satellite tuner (LNB) with navigation/positioning function is about-
110dBm；Wideband direct broadcast satellite TV signal passes through first order low-noise amplifier (LNA) circuit, second level low-noise amplifier
(LNA) circuit is amplified processing, handled by filtering, down coversion and IF amplifier circuit；Whole direct broadcasting satellite signal
It is 55dB to handle link overall gain, then the wideband direct broadcast satellite TV intermediate-freuqncy signal intensity of final output is -110+55=-55dBm.Directly
Satellite TV signal frequency range RF is broadcast for 11.7GHz~12.2GHz, the direct broadcasting satellite tuner (LNB) with navigation/positioning function is originally
Signal frequency of shaking LO is 10.75GHz, according to down coversion formula IF=RF-LO, show that the wideband direct broadcast satellite TV intermediate frequency after frequency conversion is believed
Number IF is 950MHz~1450MHz.Simultaneously as wideband direct broadcast satellite TV signal amplifies the amplification of frequency changer circuit, cause
The bottom broadband noise signal intensity about -55dBm of 1560MHz~1580MHz band limits.
Now, wideband direct broadcast satellite TV intermediate-freuqncy signal and GNSS (global positioning satellite system) signal drawn will be combined
Output, from the above mentioned, in order to ensure that GNSS satellite navigation signal is not influenceed by bottom broadband noise signal, as shown in Fig. 2
Pilot frequency combiner modular circuit needs to be filtered wideband direct broadcast satellite TV intermediate-freuqncy signal (950MHz~1450MHz), by low
Background noise signal intensity at 1560MHz~1580MHz is suppressed to more than -55- (- 77)+12=34dB by bandpass filter, is examined
Consider geographic difference, spatial electromagnetic characteristic and various weather conditions etc., the LPF in pilot frequency combiner modular circuit
The Out-of-band rejection of device, which is actually needed, accomplishes more than 38dBc.
Fig. 2 shows the pilot frequency combiner modular structure schematic diagram in the utility model embodiment, of the present utility model different
Frequency combiner module is by SAW filter, the first discrete component match circuit, the SAW filter input and GNSS signal
Circuit is connected, and the SAW filter output end is connected with the first discrete component match circuit, the first discrete component matching electricity
Road output end is connected with the F combining delivery outlet；And low pass filter, the second discrete component match circuit, low pass filtered
Ripple device input is connected with LNB circuits, and first low pass filter output connects with the second discrete component match circuit input
Connect, the second discrete component match circuit output end is connected with the F combining delivery outlet.
On the whole, pilot frequency combiner module passes through SAW filter, low pass filter, several discrete LC components etc.
Constitute, Out-of-band rejection ratio, insertion loss, standing-wave ratio and the passband fluctuation of the pilot frequency combiner module fully meet design requirement,
High stability and with low cost.
From the above mentioned, due to wideband direct broadcast satellite TV intermediate-freuqncy signal (950MHz~1450MHz) and GNSS (HA Global Positioning Satellites
System) signal (1560MHz~1580MHz) frequency is separately smaller, and will the alien frequencies combining in so small frequency interval
The Out-of-band rejection of low pass filter in device modular circuit at least needs to accomplish more than 34dBc, and Reliable Design needs to accomplish 38dBc
More than, this low pass filter that discrete LC components are built at present is because the Insertion Loss of discrete LC components will be with interior insertion
Loss is big, or Out-of-band rejection does not reach requirement.And the low pass filter in the utility model pilot frequency combiner module has two
Embodiment is planted, is respectively：1st, as shown in figure 3, low pass filter employs two LTCC (Low Temperature Co-
Fired Ceramic, low-temp ceramics burn altogether) filters in series composition.2nd, as shown in figure 4, low pass filter employs one
LTCC (Low Temperature Co-fired Ceramic, low-temp ceramics burn altogether) wave filters and one are by the discrete structures of discrete LC
The low pass filter built is composed in series.It is built-up that the low pass filter of the utility model two ways contrasts discrete LC components
Low pass filter, it has miniaturization, high quality factor, high stability, high integration, and the advantages of design is simple is and right
The characteristics of having the cheap function admirable without mistake than other integrated filters.
As shown in Figures 5 to 7, the pass band insertion loss IL of low pass filter is less than 5dB, input vswr and output standing wave
Than less than 1.8, the suppression at 1560MHz~1580MHz is much larger than 38dBc, can be to 60dBc.So so that direct broadcasting satellite is believed
Number processing link overall gain can ensure the background noise at 1560MHz~1580MHz in 55dB~70dB dynamic ranges
Less than -95dBm so that DVB (set top box) being capable of normally rating and positioning.
As shown in Fig. 2 the path by GNSS satellite framing signal in the utility model pilot frequency combiner modular circuit
It is filtered using SAW filter.SAW filter has the advantages that good squareness factor, strong antijamming capability, small volume.Such as
Shown in Fig. 8 and Fig. 9, SAW filter pass band insertion loss IL is less than 2dB, and output VSWR and output VSWR are less than 1.6,
Suppression at 950MHz~1450MHz is more than 30dBc.
Module in the utility model embodiment includes：GNSS signal circuit, LNB circuits, and pilot frequency combiner module,
The GNSS signal circuit is connected with the pilot frequency combiner module, and the LNB circuits are connected with pilot frequency combiner module, and the alien frequencies is closed
Road device module output end is connected with DVB or set top box, wherein：GNSS signal circuit is put including first order low noise
Big device and second level low-noise amplifier, and LNB circuits include first order low-noise amplifier, second level low-noise amplifier
With filtering, down coversion and IF amplifier circuit etc..Specifically as shown in Figure 10 and Figure 11, SAW filter is high in direct broadcasting satellite
Second level amplifier circuit in low noise (LNA) can be placed in frequency head (LNB) circuit design afterwards or placement first order low noise is put
After big device circuit (LNA), circuit design is flexible.
Direct broadcasting satellite tuner (LNB) with navigation/positioning function is will be live by a 75 ohm coaxial cable lines
Satellite television medium-frequency signal and GNSS signal are transferred to DVB (set top box) demodulation, as shown in Fig. 2 defeated in F combinings
Before going out, there is discrete LC Matching components circuit in two paths.By discrete LC Matching components circuit, by F combining outputs
75 Ohms systems are fitted on, the standing-wave ratio of final F combining output is less than 2.0.
To avoid wideband direct broadcast satellite TV intermediate-freuqncy signal and GNSS (global positioning satellite system) signals parallel coupling from disturbing shadow
Signal quality is rung, as shown in Figure 12 and Figure 13, when two paths import the F head delivery outlets of direct broadcasting satellite tuner (LNB), is used
The either relative mode imported of orthogonal mode is combined output, reduces the interference between signal.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
To instruct the hardware of correlation to complete by program, the program can be stored in a computer-readable recording medium, storage
Medium can include：Read-only storage (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
The low pass filter and LNB modules and signal processing method provided above the utility model embodiment is carried out
It is discussed in detail, specific case used herein is set forth to principle of the present utility model and embodiment, the above is implemented
The explanation of example is only intended to help and understands method of the present utility model and its core concept；Simultaneously for the general skill of this area
Art personnel, according to thought of the present utility model, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as to limitation of the present utility model.
Claims (5)
1. a kind of low pass filter being used in LNB modules, it is characterised in that the LNB modules include LNB circuits and satellite
Position circuit, the passband frequency range of the low pass filter is 950MHz to 1450MHz, the rejection frequency of the low pass filter
Scope is 1560MHz to 1616MHz, and the low pass filter input connects LNB circuits, after the low pass filter processing
Wideband direct broadcast satellite TV signal is exported with the satellite positioning signal combining after being handled through the satellite positioning circuitry, the LPF
Device by LTCC wave filter groups into.
2. low pass filter as claimed in claim 1, it is characterised in that the low pass filter is by two LTCC wave filter strings
Joint group into；Or the low pass filter is by a discrete LC components low pass filter and a LTCC filters in series group
Into.
3. low pass filter as claimed in claim 1, it is characterised in that the pass band insertion signal is less than
5dB, input vswr and output VSWR are less than 1.8, and the suppression scope at 1560MHz~1580MHz is in 38dB to 60dB.
4. low pass filter as claimed in claim 1, it is characterised in that the satellite fix that the satellite positioning circuitry is received
Signal is big-dipper satellite framing signal.
5. a kind of LNB modules of the low pass filter including as described in any one of Claims 1-4.
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| CN2016108230744 | 2016-08-26 | ||
| CN201610823074 | 2016-08-26 |
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| CN201621160935.7U Active CN206341311U (en) | 2016-08-26 | 2016-11-01 | A kind of low pass filter and LNB module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412467A (en) * | 2016-08-26 | 2017-02-15 | 李燕如 | Low-pass filter, LNB module and signal processing method |
| CN111147827A (en) * | 2019-12-27 | 2020-05-12 | 深圳市北斗万方信息技术有限公司 | Signal processing method and device and digital video conversion equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108964685A (en) * | 2017-05-19 | 2018-12-07 | 泰斗微电子科技有限公司 | A kind of combiner module and combiner system connecting LNB |
| CN212115548U (en) * | 2019-12-27 | 2020-12-08 | 深圳市北斗万方信息技术有限公司 | Low-noise down converter and signal processing system |
| CN112882063A (en) * | 2021-01-12 | 2021-06-01 | 上海移远通信技术股份有限公司 | Positioning module and communication equipment |
| CN113541771B (en) * | 2021-07-15 | 2022-10-28 | 广西金网通电子科技有限公司 | Satellite down converter for receiving Beidou signal for households |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944528B (en) * | 2014-05-13 | 2016-11-02 | 苏州博海创业微系统有限公司 | A kind of high suppression LTCC low pass filter |
| CN105657509B (en) * | 2016-01-26 | 2020-04-24 | 国家新闻出版广电总局广播科学研究院 | LNB module for receiving satellite television signal and corresponding satellite television set top box |
| CN106412467B (en) * | 2016-08-26 | 2024-02-20 | 泰斗微电子科技有限公司 | Low-pass filter, LNB module and signal processing method |
-
2016
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412467A (en) * | 2016-08-26 | 2017-02-15 | 李燕如 | Low-pass filter, LNB module and signal processing method |
| CN106412467B (en) * | 2016-08-26 | 2024-02-20 | 泰斗微电子科技有限公司 | Low-pass filter, LNB module and signal processing method |
| CN111147827A (en) * | 2019-12-27 | 2020-05-12 | 深圳市北斗万方信息技术有限公司 | Signal processing method and device and digital video conversion equipment |
| CN111147827B (en) * | 2019-12-27 | 2021-11-02 | 深圳市北斗万方信息技术有限公司 | Signal processing method and device and digital video conversion equipment |
Also Published As
| Publication number | Publication date |
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| CN106412467A (en) | 2017-02-15 |
| CN106412467B (en) | 2024-02-20 |
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