CN104779970B - Multiband active splitter apparatus and wireless network covering communication system - Google Patents
Multiband active splitter apparatus and wireless network covering communication system Download PDFInfo
- Publication number
- CN104779970B CN104779970B CN201410014833.3A CN201410014833A CN104779970B CN 104779970 B CN104779970 B CN 104779970B CN 201410014833 A CN201410014833 A CN 201410014833A CN 104779970 B CN104779970 B CN 104779970B
- Authority
- CN
- China
- Prior art keywords
- channel
- switch
- active splitter
- circuit unit
- bandpass filter
- 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
Landscapes
- Transceivers (AREA)
Abstract
Multiband active splitter apparatus, including the tunable bandpass filter being connected in series successively, High Linear low-noise amplifier, first multi-channel rf is switched, narrow band filter, second multi-channel rf is switched and power divider, the bandpass filter control circuit unit of control tunable bandpass filter centre frequency and/or bandwidth, control the RF switch control circuit unit that the first multi-channel rf is switched and the second multi-channel rf switch is closed or opened, it is High Linear low-noise amplifier, first multi-channel rf is switched, second multi-channel rf is switched, bandpass filter controls the power subsystem that circuit unit and RF switch control circuit unit are powered；Bandpass filter control circuit unit is connected with tunable bandpass filter；RF switch control circuit unit is switched with the first multi-channel rf and the second multi-channel rf switch is connected.Splitter apparatus of the present invention solve the problems, such as the weak and descending big signal Intermodulation Interference of upward signal, and reduce the cost that wireless network covers communication system.
Description
【Technical field】
The present invention relates to multiplex communication, the multiplex communication system on intercom is more particularly to applied to, especially
It is related to receive the multiband active splitter apparatus of intercom signal.
【Background technology】
In a wireless communication system, particularly in some private network communication systems, due to multichannel common, between different channels
Radiofrequency signal coupling, Intermodulation Interference can be produced, therefore, in engineer applied transceiver insulation can be done using duplexer.To make up
Multichannel branch and feeder loss, up shunt use active splitter.
Referring to Fig. 4, prior art active splitter 20 ' is by bandpass filter wider, low-noise amplifier and power
Distributor is constituted, and the bandwidth of active splitter 20 ' fixes non-adjustable, and broader bandwidth.Become increasingly complex in electromagnetic environment
Today, understand some useless big signals and receiver is entered by active splitter 20 ', influence the performance of receiver, cannot protect naturally
The communication steady in a long-term of card wireless network covering communication system.Referring to Fig. 5, prior art active splitter 20 ' is applied wireless
High-performance duplexer must be used in network coverage communication system, the weak and descending big signal Intermodulation Interference of upward signal could be solved
Problem, could also improve system stability and ensure system speech quality, but so cost be increased by a lot.
【The content of the invention】
The technical problem to be solved in the present invention is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of multiband
Active splitter apparatus and wireless network covering communication system, the multiband active splitter apparatus not only solve upward signal
The problem of weak and descending big signal Intermodulation Interference, and ensureing the base of wireless network covering communication system stabilization and speech quality
On plinth, the cost that wireless network covers communication system is reduced.
The present invention solves the technical scheme that the technical problem uses：
A kind of multiband active splitter apparatus, including power divider and power subsystem are provided;Active point of the multiband
Road device device also includes that the tunable bandpass filter being connected in series successively, High Linear low-noise amplifier, the first multi-channel rf are opened
Close, narrow band filter and the second multi-channel rf switch, and including control the tunable bandpass filter centre frequency and/
Or the bandpass filter control circuit unit of bandwidth, also control the first multi-channel rf switch and the second multi-channel rf to switch
Closure or the RF switch control circuit unit opened；The power divider is connected with second multi-channel rf switch；
The power subsystem is respectively the High Linear low-noise amplifier, the first multi-channel rf switch, the second multi-channel rf switch, band
Bandpass filter controls circuit unit and RF switch control circuit unit to power；The bandpass filter controls circuit unit and institute
Tunable bandpass filter is stated to be connected；RF switch control circuit unit respectively with first multi-channel rf switch and the
Two multi-channel rfs switch is connected；After the multiband active splitter apparatus receive wireless signal, the wireless signal leads to first
The tunable bandpass filter crossed inside the multiband active splitter apparatus carries out first time filtering, then by High Linear low noise
Acoustic amplifier amplifies, then again by by the first multi-channel rf switch, narrow band filter and the second multi-channel rf switches set
Into the narrow band filter of optional frequency band carry out second filtering, then institute will be delivered to by the signal for filtering twice and amplify
Power divider is stated, the signal branch that the power divider will twice be filtered and amplified is to outside each receiver.
The multiband active splitter apparatus are applied in the communication system of intercom.Particularly, the multifrequency is carried
Source splitter apparatus are applied to the UHF private network communication systems that frequency is 400MHz~520MHz.Or, the multifrequency is carried
Source splitter apparatus are applied to the VHF private network communication systems that frequency is 136-174MHz.UHF is English Ultra High
The abbreviation of Frequency, Chinese means hyperfrequency；VHF is the abbreviation of English Very high frequency, the Chinese meaning
It is very high frequency(VHF).
A kind of wireless network covering communication system, including antenna-feedback system, active splitter, combiner and at least one are also provided
The trunk desk of bar channel, and the external power source powered for the active splitter;Wireless network covering communication system is also wrapped
Include the first low performance duplexer and each second low performance duplexer same amount of with the trunk desk；The active splitter is
Multiband active splitter apparatus, including power subsystem are also low including the tunable bandpass filter that is connected in series successively, High Linear
Noise amplifier, the first multi-channel rf switch, narrow band filter, the second multi-channel rf switch and power divider, and
Bandpass filter including controlling the tunable bandpass filter centre frequency and/or bandwidth controls circuit unit, also controls
The first multi-channel rf switch and the second multi-channel rf switch closure or the RF switch control circuit unit opened；The electricity
Source unit is respectively the High Linear low-noise amplifier, the first multi-channel rf switch, the second multi-channel rf switch, bandpass filtering
Device controls circuit unit and RF switch control circuit unit to power；The bandpass filter controls circuit unit and the tuning
Bandpass filter is connected；The RF switch control circuit unit is switched and the second multichannel with first multi-channel rf respectively
RF switch is connected；The first low performance duplexer respectively with the antenna-feedback system, multiband active splitter apparatus and
Combiner is electrically connected；Each second low performance duplexer respectively with multiband active splitter apparatus, combiner and corresponding relaying
Platform is electrically connected；The wireless signal that the antenna-feedback system will be received delivers to the first low performance duplexer, then through described first
Low performance duplexer is transferred to the multiband active splitter apparatus, and the multiband active splitter apparatus receive the nothing
After line signal, the wireless signal carries out by the tunable bandpass filter inside the multiband active splitter apparatus first
Once filter, then amplify by High Linear low-noise amplifier, then filtered by by the first multi-channel rf switch, narrow-band bandpass again
The narrow band filter of the optional frequency band of ripple device and the second multi-channel rf switch composition carries out second filtering, then will be by two
Secondary filtering and the signal for amplifying deliver to the power divider, the signal branch that the power divider will be filtered and amplify twice
To each second low performance duplexer and corresponding trunk desk is sent to, each trunk desk is forwarded on corresponding receiver again, thus
Realize a complete communication process.
The wireless network covering communication system applications are in the wireless network covering communication system of intercom.Particularly,
The wireless network covering communication system applications are the UHF private network communication systems of 400MHz~520MHz in frequency.Or,
The wireless network covering communication system applications are the VHF private network communication systems of 136-174MHz in frequency.
Compared with the existing technology compared with multiband active splitter apparatus of the present invention and wireless network cover having for communication system
Beneficial effect is：
1st, using multiband active splitter apparatus of the present invention, up weaker signal can effectively be strengthened and is put
Greatly, descending big signal Intermodulation Interference is also solved the problems, such as, while not sensitivity, the dynamic of reduction trunk desk and receiver
Scope and intermodulation index, and also compensates for the loss of up-link；
2nd, multiband active splitter apparatus prime of the present invention uses tunable bandpass filter, can be by the band of 3dB
Width accomplishes within 30MHz, can the outer strong signal blocking of anti-stop-band；And by using narrower bandwidth after High Linear low-noise amplifier
Narrow band filter is filtered again, make multiband active splitter apparatus of the present invention to from it is descending and band outside signal have compared with
Good inhibitory action;
3 and multiband active splitter apparatus are applied in wireless network covering communication system, can be double with low performance
Work device substitutes the high-performance duplexer of prior art, can thus reduce the cost in wireless network covering application system.
In sum, multiband active splitter apparatus of the present invention not only solve the weak and descending big signal of upward signal
The problem of Intermodulation Interference, and on the basis of wireless network covering communication system stabilization and speech quality is ensured, reduce nothing
The cost of line network coverage communication system.
【Brief description of the drawings】
Fig. 1 is the theory diagram of multiband active splitter apparatus of the present invention, and dotted portion represents wireless signal in figure, is adjusted
That arrow above humorous bandpass filter 21 represents that wireless signal is input into from this, two arrow tables below power divider 26
Show that signal is exported from this;
Fig. 2 is the application principle block diagram of the multiband active splitter apparatus, and dotted portion represents that the multifrequency is carried
Source splitter apparatus can make three branches or four branches are used;
Fig. 3 is the theory diagram that wireless network covers application system, and dotted portion represents the wireless network covering application
System can be used for three channels or four channel systems;
Fig. 4 is the application square frame principle block diagram of prior art active splitter;
Fig. 5 is the theory diagram that prior art wireless network covers application system.
【Specific embodiment】
The present invention is described in further detail with reference to each accompanying drawing.
Referring to Fig. 1 to Fig. 3, the present invention relates to a kind of multiband active splitter apparatus 20, including the He of power divider 26
Power subsystem 29;The multiband active splitter apparatus 20 also include the tunable bandpass filter 21, the line high that are connected in series successively
Property low-noise amplifier 22, the first multi-channel rf switch 23, the multi-channel rf of narrow band filter 24 and second switch 25, and
Bandpass filter including controlling the centre frequency of tunable bandpass filter 21 and/or bandwidth controls circuit unit 27, also
Control the first multi-channel rf switch 23 and the closure of the second multi-channel rf switch 25 or the RF switch control circuit list opened
Unit 28；The power divider 26 is connected with second multi-channel rf switch 25；The power subsystem 29 is respectively described
High Linear low-noise amplifier 22, the first multi-channel rf switch the 23, second multi-channel rf switch 25, bandpass filter control circuit
Unit 27 and RF switch control circuit unit 28 are powered；The bandpass filter controls circuit unit 27 and the tuning band logical
Wave filter 21 is connected, and bandpass filter control also one effect of circuit unit 27 is exactly power subsystem 29 by the band logical
Filter control circuit unit 27 is that tunable bandpass filter 21 is powered indirectly；The RF switch control circuit unit 28 is distinguished
It is connected with first multi-channel rf switch 23 and the second multi-channel rf switch 25；The multiband active splitter apparatus 20
After receiving wireless signal, the wireless signal of intercom is such as received, the wireless signal is first by the active branch of the multiband
Tunable bandpass filter 21 inside device device 20 carries out first time filtering, then amplifies by High Linear low-noise amplifier 22,
Then it is optional by what is be made up of the first multi-channel rf switch 23, multi-channel rf of narrow band filter 24 and second switch 25 again
The narrow band filter of frequency band carries out second filtering, then will deliver to the power point by the signal for filtering twice and amplify
Orchestration 26, the signal branch that the power divider 26 will twice be filtered and amplified to outside each receiver 30, give by such as branch
On outside corresponding intercom.
The multiband active splitter apparatus 20 are applied in the communication system of intercom.Particularly, the multiband
Active splitter apparatus 20 are applied to the UHF private network communication systems that frequency is 400MHz~520MHz.Or, the multifrequency
The VHF private network communication systems that frequency is 136-174MHz are applied to active splitter apparatus 20.
It is the invention further relates to a kind of wireless network covering communication system including antenna-feedback system 10, active referring to Fig. 1 to Fig. 3
The trunk desk 70 of shunt, the channel of combiner 50 and at least one, and the external power source 80 powered for the active splitter;
Wireless network covering communication system also includes the first low performance duplexer 40 and same amount of with the trunk desk 70 each the
Two low performance duplexers 60；The active splitter is multiband active splitter apparatus 20, including power subsystem 29 also includes
Tunable bandpass filter 21, High Linear low-noise amplifier 22, the first multi-channel rf switch 23, arrowband band being connected in series successively
Bandpass filter 24, the second multi-channel rf switch 25 and power divider 26, and including controlling the tunable bandpass filter 21
The bandpass filter control circuit unit 27 of centre frequency and/or bandwidth, also controls first multi-channel rf to switch 23 Hes
The closure of second multi-channel rf switch 25 or the RF switch control circuit unit 28 opened；The power subsystem 29 is respectively described
High Linear low-noise amplifier 22, the first multi-channel rf switch the 23, second multi-channel rf switch 25, bandpass filter control circuit
Unit 27 and RF switch control circuit unit 28 are powered；The bandpass filter controls circuit unit 27 and the tuning band logical
Wave filter 21 is connected；The RF switch control circuit unit 28 switchs more than 23 and second with first multi-channel rf respectively
Road RF switch 25 is connected；The first low performance duplexer 40 respectively with the active branch of the antenna-feedback system 10, multiband
Device device 20 and combiner 50 are electrically connected；Each second low performance duplexer 60 respectively with multiband active splitter apparatus 20, close
Road device 50 and corresponding trunk desk 70 are electrically connected；The wireless signal that the antenna-feedback system 10 will be received delivers to the described first low property
Can duplexer 40, as described antenna-feedback system 10 will receive the wireless signal of intercom and deliver to the first low performance duplexer
40, then the multiband active splitter apparatus 20 are transferred to through the first low performance duplexer 40, the multiband is active
After splitter apparatus 20 receive the wireless signal, the wireless signal is first by the multiband active splitter apparatus 20
The tunable bandpass filter 21 in portion carries out first time filtering, then amplifies by High Linear low-noise amplifier 22, then passes through again
The arrowband of the optional frequency band being made up of the first multi-channel rf switch 23, multi-channel rf of narrow band filter 24 and second switch 25
Bandpass filter carries out second filtering, then will deliver to the power divider 26, institute by the signal for filtering twice and amplify
State power divider 26 will twice filter and amplify signal branch to each second low performance duplexer 60 and be sent to it is corresponding in
After platform 70, each trunk desk 70 is forwarded on corresponding receiver again, and such as each trunk desk 70 is forwarded on corresponding intercom again, this
Sample is achieved that a complete communication process.
The wireless network covering communication system applications are in the wireless network covering communication system of intercom.Particularly,
The wireless network covering communication system applications are the UHF private network communication systems of 400MHz~520MHz in frequency.Or,
The wireless network covering communication system applications are the VHF private network communication systems of 136-174MHz in frequency.
Exchanging simulating network by high-performance duplexer in Fig. 3 and Fig. 5 and low performance duplexer repeatedly carries out test and comparison.Most
Test result is afterwards：By Fig. 3 and Fig. 5 networking speaking tests, communication distance and speech quality do not have significant difference；And by Fig. 3 and
High-performance duplexer and low performance duplexer in Fig. 5 exchange networking speaking test, and the high-performance duplexer in Fig. 5 changes low property into
After energy duplexer, communication distance is deteriorated, and speech quality is also deteriorated, and has noise to occur；Low performance duplexer in Fig. 3 changes property high into
After energy duplexer, communication distance and speech quality substantially do not deteriorate.This just illustrates that the active splitter 20 ' of prior art is applied
High-performance duplexer must be used in wireless network covering communication system, the weak and descending big signal of upward signal could be solved mutual
The problem that cadre enrolled among workers disturbs, the stability that whole system could be improved and the speech quality for ensureing whole system.And multifrequency of the invention
Band active splitter apparatus 20 are applied in wireless network covering communication system, either using low performance duplexer or high
Performance duplexer, can solve the problems, such as the weak and descending big signal Intermodulation Interference of upward signal, can improve the steady of whole system
Speech quality that is qualitative and ensureing whole system；And working as has made to use low performance duplexer, it is possible to which reducing wireless network covering should
With the cost in system.
Above example only expresses the preferred embodiment of the present invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention;It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
Enclose;Therefore, all equivalents done with scope of the invention as claimed and modification, all should belong to the culvert of the claims in the present invention
Lid scope.
Claims (8)
1. a kind of multiband active splitter apparatus（20）, including power divider（26）And power subsystem（29）；Its feature exists
In：
Also include the tunable bandpass filter being connected in series successively（21）, High Linear low-noise amplifier（22）, the first multichannel penetrates
Frequency is switched（23）, narrow band filter（24）Switched with the second multi-channel rf（25）, and including controlling the tuning band logical
Wave filter（21）The bandpass filter control circuit unit of centre frequency and/or bandwidth（27）, also control first multichannel
RF switch（23）Switched with the second multi-channel rf（25）Closure or the RF switch control circuit unit opened（28）；The work(
Rate distributor（26）Switched with second multi-channel rf（25）It is connected；The power subsystem（29）Respectively described High Linear
Low-noise amplifier（22）, the first multi-channel rf switch（23）, the second multi-channel rf switch（25）, bandpass filter control circuit
Unit（27）Circuit unit is controlled with RF switch（28）Power supply；The bandpass filter controls circuit unit（27）With the tune
Humorous bandpass filter（21）It is connected；The RF switch controls circuit unit（28）Switched with first multi-channel rf respectively
（23）Switched with the second multi-channel rf（25）It is connected；
The multiband active splitter apparatus（20）After receiving wireless signal, the wireless signal is carried by the multifrequency first
Source splitter apparatus（20）Internal tunable bandpass filter（21）First time filtering is carried out, then by High Linear low noise amplification
Device（22）Amplify, then switched by by the first multi-channel rf again（23）, narrow band filter（24）With the second multi-channel rf
Switch（25）The narrow band filter of the optional frequency band of composition carries out second filtering, then by by filtering twice and amplifying
Signal delivers to the power divider（26）, the power divider（26）The signal branch that will twice filter and amplify is to outside
Each receiver（30）.
2. multiband active splitter apparatus according to claim 1（20）, it is characterised in that：
The multiband active splitter apparatus（20）It is applied in the communication system of intercom.
3. multiband active splitter apparatus according to claim 1 and 2（20）, it is characterised in that：
The multiband active splitter apparatus（20）It is applied to the UHF private network communications system that frequency is 400MHz~520MHz
System.
4. multiband active splitter apparatus according to claim 1 and 2（20）, it is characterised in that：
The multiband active splitter apparatus（20）It is applied to the VHF private network communication systems that frequency is 136-174MHz.
5. a kind of wireless network covering communication system, including antenna-feedback system（10）, active splitter, combiner（50）At least one
The trunk desk of bar channel（70）, and the external power source powered for the active splitter（80）；It is characterized in that：
Also include the first low performance duplexer（40）And with the trunk desk（70）Same amount of each second low performance duplexer
（60）；The active splitter is multiband active splitter apparatus（20）, including power subsystem（29）, also including serial successively
The tunable bandpass filter of connection（21）, High Linear low-noise amplifier（22）, the first multi-channel rf switch（23）, narrow-band bandpass
Wave filter（24）, the second multi-channel rf switch（25）And power divider（26）, and including controlling the tuning bandpass filtering
Device（21）The bandpass filter control circuit unit of centre frequency and/or bandwidth（27）, also control first multi-channel rf
Switch（23）Switched with the second multi-channel rf（25）Closure or the RF switch control circuit unit opened（28）；The power supply list
Unit（29）Respectively described High Linear low-noise amplifier（22）, the first multi-channel rf switch（23）, the second multi-channel rf switch
（25）, bandpass filter control circuit unit（27）Circuit unit is controlled with RF switch（28）Power supply；The bandpass filter
Control circuit unit（27）With the tunable bandpass filter（21）It is connected；The RF switch controls circuit unit（28）Point
Do not switched with first multi-channel rf（23）Switched with the second multi-channel rf（25）It is connected；
The first low performance duplexer（40）Respectively with the antenna-feedback system（10）, multiband active splitter apparatus（20）With
Combiner（50）Electrical connection；Each second low performance duplexer（60）Respectively with multiband active splitter apparatus（20）, combiner
（50）With corresponding trunk desk（70）Electrical connection；
The antenna-feedback system（10）The wireless signal that will be received delivers to the first low performance duplexer（40）, then through described
One low performance duplexer（40）It is transferred to the multiband active splitter apparatus（20）, the multiband active splitter apparatus
（20）After receiving the wireless signal, first by the multiband active splitter apparatus（20）Internal tuning bandpass filtering
Device（21）First time filtering is carried out, then by High Linear low-noise amplifier（22）Amplify, then again by being penetrated by the first multichannel
Frequency is switched（23）, narrow band filter（24）Switched with the second multi-channel rf（25）The narrow-band bandpass filter of the optional frequency band of composition
Ripple device carries out second filtering, then will deliver to the power divider by the signal for filtering twice and amplify（26）, the work(
Rate distributor（26）The signal branch that will twice filter and amplify is to each second low performance duplexer（60）And be sent to it is corresponding in
After platform（70）, each trunk desk（70）It is forwarded to again on corresponding receiver, is so achieved that a complete communication process.
6. wireless network according to claim 5 covers communication system, it is characterised in that：
The wireless network covering communication system applications are in the wireless network covering communication system of intercom.
7. the wireless network according to claim 5 or 6 covers communication system, it is characterised in that：
The wireless network covering communication system applications are the UHF private network communication systems of 400MHz~520MHz in frequency.
8. the wireless network according to claim 5 or 6 covers communication system, it is characterised in that：
The wireless network covering communication system applications are the VHF private network communication systems of 136-174MHz in frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014833.3A CN104779970B (en) | 2014-01-13 | 2014-01-13 | Multiband active splitter apparatus and wireless network covering communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014833.3A CN104779970B (en) | 2014-01-13 | 2014-01-13 | Multiband active splitter apparatus and wireless network covering communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104779970A CN104779970A (en) | 2015-07-15 |
| CN104779970B true CN104779970B (en) | 2017-07-07 |
Family
ID=53621242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410014833.3A Active CN104779970B (en) | 2014-01-13 | 2014-01-13 | Multiband active splitter apparatus and wireless network covering communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104779970B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109033915A (en) * | 2018-08-06 | 2018-12-18 | 上海易钥电子科技有限公司 | A kind of storable double frequency temperature label of low-power consumption |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009237146A (en) * | 2008-03-26 | 2009-10-15 | Epson Toyocom Corp | Wavelength filter |
| CN101583206A (en) * | 2009-05-27 | 2009-11-18 | 中兴通讯股份有限公司 | TD-SCDMA dual-card dual-standby mobile terminal |
| CN101599801A (en) * | 2008-06-06 | 2009-12-09 | 富士通株式会社 | Filter coefficient regulator and method |
| CN103067036A (en) * | 2012-10-24 | 2013-04-24 | 国网电力科学研究院 | Radio frequency receiving device of discontinuous frequency spectrum and method thereof |
| CN203747817U (en) * | 2014-01-13 | 2014-07-30 | 深圳市欧标实业发展有限公司 | Multiband active demultiplexer device and wireless network coverage communication system |
-
2014
- 2014-01-13 CN CN201410014833.3A patent/CN104779970B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009237146A (en) * | 2008-03-26 | 2009-10-15 | Epson Toyocom Corp | Wavelength filter |
| CN101599801A (en) * | 2008-06-06 | 2009-12-09 | 富士通株式会社 | Filter coefficient regulator and method |
| CN101583206A (en) * | 2009-05-27 | 2009-11-18 | 中兴通讯股份有限公司 | TD-SCDMA dual-card dual-standby mobile terminal |
| CN103067036A (en) * | 2012-10-24 | 2013-04-24 | 国网电力科学研究院 | Radio frequency receiving device of discontinuous frequency spectrum and method thereof |
| CN203747817U (en) * | 2014-01-13 | 2014-07-30 | 深圳市欧标实业发展有限公司 | Multiband active demultiplexer device and wireless network coverage communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104779970A (en) | 2015-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107210775B (en) | High frequency power amplification module and communication device | |
| WO2017113583A1 (en) | Control circuit for implementing carrier aggregation and dual-band wifi mimo, and terminal | |
| CN206313756U (en) | A kind of variable impedance tuner and the radio system with the device | |
| CN105553494B (en) | A kind of radio-frequency front-end frequency selection circuit and its signal acceptance method | |
| CN206259922U (en) | RF front-end module and mobile terminal | |
| CN104716906A (en) | Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier | |
| CN106559100A (en) | A kind of communication RF front-end module and communication means | |
| TW201803296A (en) | Multi-business digital light distribution system and multi-business capacity scheduling method | |
| CN107017913A (en) | A kind of RF transmit-receive circuit | |
| CN104242975A (en) | Communication terminal and method for reducing interference of communication terminal | |
| CN106788472A (en) | The radio frequency front-end device and mobile terminal of carrier aggregation | |
| CN103972629B (en) | A kind of combiner, base station, signal close road system and method for transmitting signals | |
| CN203747817U (en) | Multiband active demultiplexer device and wireless network coverage communication system | |
| CN106452471A (en) | GSM radio frequency circuit and terminal comprising circuit | |
| CN110365392A (en) | Feedback cancellation on multiband booster | |
| CN207442845U (en) | A kind of new multiband WiMAX repeater | |
| CN107769869A (en) | Multi-signal passive intermodulation test system | |
| CN104779970B (en) | Multiband active splitter apparatus and wireless network covering communication system | |
| CN103001587A (en) | X-frequency-range extra-low inter-modulation frequency converter device of measurement and control system | |
| CN202269021U (en) | Multi-system access platform for airport communication | |
| CN107070482A (en) | The power amplification system of full operator full system type pictorial covering | |
| CN203942528U (en) | A kind of wireless coverage strengthens equipment | |
| CN201690414U (en) | Transceiving channel device for KA frequency converter | |
| CN107786213B (en) | A kind of device promoting interference free performance | |
| CN202696594U (en) | Multi-band signal combiner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |