CN108631810A - The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing - Google Patents
The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing Download PDFInfo
- Publication number
- CN108631810A CN108631810A CN201810445905.8A CN201810445905A CN108631810A CN 108631810 A CN108631810 A CN 108631810A CN 201810445905 A CN201810445905 A CN 201810445905A CN 108631810 A CN108631810 A CN 108631810A
- Authority
- CN
- China
- Prior art keywords
- filter
- limiter
- amplifier
- frequency
- freuqncy signal
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
Abstract
The anti-interference demodulation intermediate frequency unit of C frequency ranges that the invention discloses a kind of based on amplitude limiting processing, can be applied to C frequency range Anti-Jamming Satellite Communications Systems.The present invention is made of components such as amplifier, filter, limiter, frequency mixer, switch, demodulator, adjustable attenuators, is controlled by parallel interface.The present invention has miniaturization, low-power consumption, strong antijamming capability, and filter group switch speed is fast, simple in structure, steady performance, can work normally in the presence of a harsh environment, be particularly suitable for application as the demodulation intermediate frequency unit of anti-interference satellite communication equipment.The reasonable utilization of limiter and filter is the key that the invention, is control effectively to the entry level of amplifiers at different levels by limiter, ensures that entire radio frequency link still can be worked normally in the case where interfering signal power is very high；The interference signal outside useful signal band is effectively filtered out by intermediate-frequency filter, significantly improves the anti-interference ability of radio frequency link.
Description
Technical field
The present invention relates to a kind of anti-interference demodulation intermediate frequency units based on amplitude limiting processing in wireless communication field, especially suitable
For the demodulation intermediate frequency unit as anti-interference satellite communication equipment.
Background technology
At present in the military satellite communications field, the interference from space is more and more, seriously affects satellite communication system
Communication capacity, in order to enhance anti-interference of communication system and ability of anti-interception, modem termination usually requires to realize quick jump
Frequency and the requirement for meeting different rates, especially Anti-Jamming Satellite Communications Systems, it is fast frequency-hopped, small in addition to requiring local vibration source to have
Outside the characteristics of stepping and miniaturization, low-power consumption, also there are strict requirements for demodulation intermediate frequency unit, demodulation intermediate frequency unit is not only
Meet small, low-power consumption requirement, this index also has very high requirement to jamming-to-signal ratio.The solution of satellite communication equipment at present
Adjust intermediate frequency unit that cannot meet miniaturization, low-power consumption and the high requirement of jamming-to-signal ratio simultaneously.
Invention content
It is an object of the invention to avoid the deficiency in above-mentioned background technology and provide it is a kind of can be logical as anti-interference satellite
Believe that the anti-interference demodulation intermediate frequency unit of equipment demodulation intermediate frequency, the present invention can be transported at -40 DEG C~+60 DEG C of relatively rugged environment
Row, can work normally in jamming-to-signal ratio very high 60dB, while also have miniaturization, low-power consumption, simple in structure, performance stabilization etc.
Feature.
The technical solution used in the present invention is：The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing, including the
One filter 1, the first amplifier 2, the first controllable attenuator 3, the second amplifier 4, the first limiter 5, the 6, first frequency of frequency mixer
Rate synthesizer 7, switch filtering unit 8, third amplifier 9, the second controllable attenuator 10, limited range enlargement unit 11, second filter
Device 12, demodulator 13, second frequency synthesizer 14, third filter 15.The first filter 1 believes the radio frequency received
It number is filtered, filters out after band stray signal output to the first amplifier 2；First amplifier 2 is to filtered radio frequency
Signal is amplified, and amplified radiofrequency signal is exported to the first controllable attenuator 3；After first controllable attenuator 3 is to amplification
Radiofrequency signal carry out power adjustment, the radiofrequency signal after power adjustment is exported to the second amplifier 4；Second amplifier 4 is right
Radiofrequency signal after power adjustment exports after being amplified to the first limiter 5；First limiter 5 is to the radiofrequency signal that receives
It is exported to frequency mixer 6 after carrying out amplitude limiting processing；The radiofrequency signal and first frequency that frequency mixer 6 will be received from the first limiter 5
The local oscillation signal that synthesizer 7 generates is mixed to obtain intermediate-freuqncy signal, and intermediate-freuqncy signal is exported to switch filtering unit 8；Switch
Intermediate-freuqncy signal is divided into two-way by filter unit 8 by branch and switching, by different filters respectively to two-way intermediate frequency
Signal is filtered, filter out export after band stray all the way intermediate-freuqncy signal to third amplifier 9；Third amplifier 9 docks
The intermediate-freuqncy signal received exports after being amplified to the second controllable attenuator 10；Amplification of second controllable attenuator 10 to receiving
Intermediate-freuqncy signal afterwards carries out power adjustment, and the intermediate-freuqncy signal after power adjustment is exported to limited range enlargement unit 11；Limited range enlargement
Unit 11 carries out amplitude limit and enhanced processing by the cascade of casacade multi-amplifier and limiter to the intermediate-freuqncy signal after power adjustment,
And it exports to second filter 12；Second filter 12 is filtered the intermediate-freuqncy signal after limited range enlargement, filters out band stray
It is exported to demodulator 13 after signal；Demodulator 13 generates the filtered intermediate-freuqncy signal received with second frequency synthesizer 14
Local oscillation signal be mixed after obtain the IQ differential baseband signals needed for system, output to third filter 15；Third filters
Device 15 exports after being filtered to IQ differential baseband signals.
Wherein, the switch filtering unit 8, including splitter 16, the 4th filter 17, the 5th filter the 18, the 6th
Filter 19, the 7th filter 20 and switch 21；The intermediate-freuqncy signal of input is carried out branch by splitter 16, generates two-way intermediate frequency letter
Number, wherein intermediate-freuqncy signal is filtered through the 4th filter 17 and the 5th filter 18 successively all the way, filter out band stray
Output extremely switch 21 afterwards；Another way intermediate-freuqncy signal is filtered through the 6th filter 19 and the 7th filter 20 successively, filter
Except output extremely switch 21 after band stray；Two-way intermediate-freuqncy signal after 21 pairs of switch is filtered selects, and selects defeated all the way
Go out；Wherein, the 4th filter 17 and the 5th filter 18 are different from the 6th filter 19 and the bandwidth of the 7th filter 20.
Wherein, the limited range enlargement unit 11, including the 4th amplifier 22, the 5th amplifier 23, the second limiter 24,
6th amplifier 25, third limiter 26, the 7th amplifier 27 and the 4th limiter 28；4th amplifier 22 and the 5th amplifier
23 pairs of intermediate-freuqncy signals received are amplified successively, and amplified intermediate-freuqncy signal is exported to the second limiter 24；Second limit
Width device 24 carries out amplitude limiting processing to the intermediate-freuqncy signal received and is exported to third amplitude limit after the 6th amplifier 25 is amplified
Device 26；Third limiter 26 carries out amplitude limiting processing to the intermediate-freuqncy signal received and is exported after the 7th amplifier 27 is amplified
To the 4th limiter 28；4th limiter 28 exports after carrying out amplitude limiting processing to the intermediate-freuqncy signal received.
The present invention has the following advantages over the background art：
1, the present invention has the high characteristic of jamming-to-signal ratio, can still be worked normally when jamming-to-signal ratio is up to 60dB.
2, integration degree of the present invention is high, and low in energy consumption, debugging work load is small, can be -40 DEG C in relatively rugged environment temperature
It is worked normally at~+60 DEG C.
3, structure of the invention is compact, small, at low cost, has application value.
Description of the drawings
Fig. 1 is that the present invention is based on the functional block diagrams of the anti-interference demodulation intermediate frequency unit of the C frequency ranges of amplitude limiting processing；
Fig. 2 is the functional block diagram of switch filtering unit in the present invention；
Fig. 3 is the functional block diagram for amplifying clipping unit in the present invention.
Specific implementation mode
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to Fig.1, the present invention includes first filter 1, the first amplifier 2, the first controllable attenuator 3, the second amplifier
4, the first limiter 5, frequency mixer 6, first frequency synthesizer 7, switch filtering unit 8, third amplifier 9, the second controllable attenuation
Device 10, limited range enlargement unit 11, second filter 12, demodulator 13, second frequency synthesizer 14 and third filter 15.Fig. 1
It is the electrical schematic block diagram of the embodiment of the present invention, embodiment presses Fig. 1 connection lines.Wherein first filter 1 filters out radiofrequency signal
In high frequency spurious signal, embodiment first filter 1 use commercially available dedicated filter LFCN-3800+；First amplifier 2
Power amplification is carried out to radiofrequency signal, the first amplifier of embodiment 2 uses commercially available dedicated amplifier HMC465LP5E；First can
Control attenuator 3 controls RF signal power, provides adjustable output power, the first controllable attenuator of embodiment 3 is adopted
With commercially available dedicated controllable attenuator HMC624LP4E；The second amplifier of embodiment 4 acts on and model is the same as the first amplifier 2；The
One limiter 5 uses commercially available dedicated limiter VLM-63-2W+, prevents the RF signal power into frequency mixer 6 excessively high；It is mixed
Radiofrequency signal is mixed to obtain required intermediate-freuqncy signal with the local oscillation signal that first frequency synthesizer 7 is provided by frequency device 6,
Embodiment frequency mixer 6 uses commercially available dedicated frequency mixer MCA1-60+；First frequency synthesizer 7 provides local oscillator for frequency mixer, real
It applies a first frequency synthesizer 7 and uses commercially available dedicated integrated chip RFFC5072A；Switch filtering unit 8 include splitter 16,
4th filter 17, the 5th filter 18, the 6th filter 19, the 7th filter 20 and switch 21.Splitter 16 be used for will in
Frequency signal is divided into the equal intermediate-freuqncy signal of two-way power, and splitter 16 uses commercially available dedicated splitter SP-2C1+ in embodiment；
The signal all the way that 4th filter 17, the 5th filter 18 are used for exporting splitter 16 is filtered, the 4th filter in embodiment
Wave device 17 use commercially available dedicated filter LFCN-1000+, the 5th filter 18 be customed product, centre frequency 1000MHz,
Bandwidth 50MHz；The another way signal that 6th filter 19, the 7th filter 20 are used for exporting splitter 16 is filtered, real
Applying the effect of the 6th filter 19 and model in example, with the 4th filter 17, the 7th filter 20 is customed product, centre frequency
1000MHz, bandwidth 5MHz；Two-way intermediate-freuqncy signal after 21 pairs of switch is filtered selects, and switch 21 uses in embodiment
Commercially available dedicated integrated switch HMC232LP3；Third amplifier 9 carries out power amplification, the amplification of embodiment third to intermediate-freuqncy signal
Device 9 uses commercially available dedicated amplifier SBB-3089Z；Second controllable attenuator 10 acts on and model is the same as the first controllable attenuator 3；
Embodiment limited range enlargement unit 11 include the 4th amplifier 22, the 5th amplifier 23, the second limiter 24, the 6th amplifier 25,
Third limiter 26, the 7th amplifier 27 and the 4th limiter 28.The 4th amplifier 22 of embodiment acts on and model is put with third
Big device 9；5th amplifier 23 carries out power amplification to intermediate-freuqncy signal, and the 5th amplifier 23 of embodiment uses commercially available dedicated amplification
Device ADL5324；Second limiter 24 uses commercially available dedicated limiter ZFLM-252-1WL+, prevents intermediate-freuqncy signal power excessive；
The 6th amplifier 25 of embodiment, the effect of the 7th amplifier 27 and model are the same as the 5th amplifier 23；Embodiment third limiter 26,
Four limiters 28 act on and model is the same as the second limiter 24；Second filter 12 is customed product, centre frequency 1000MHz, band
Wide 50MHz；By treated, intermediate-freuqncy signal with the local oscillation signal that second frequency synthesizer 14 provides be mixed demodulator 13
To IQ baseband signals, embodiment demodulator 13 uses commercially available dedicated demodulator ADL5382ARUZ；Second frequency synthesizer 14 is
Demodulator 13 provides local oscillation signal, and embodiment second frequency synthesizer 14 uses commercially available dedicated integrated chip RFFC2072A；The
Three filters 15 to baseband signal outside it is spuious filter out, embodiment third filter 15 uses LC filters.
Wherein the switch filtering unit 8 includes splitter 16, the 4th filter 17, the filtering of the 5th filter the 18, the 6th
Device 19, the 7th filter 20 and switch 21；As shown in Fig. 2, major function, which is the intermediate-freuqncy signal that will be inputted, carries out branch, two are generated
Road intermediate-freuqncy signal is respectively filtered two-way intermediate-freuqncy signal by two sections of intermediate-frequency filters, filters out band stray, finally
The two-way intermediate-freuqncy signal after being filtered is selected by switch.The filtering that two-way intermediate-freuqncy signal passes through two groups of different bandwidths
Device is filtered respectively, and the filtering demands of unlike signal rate can be met by carrying out selection by switching, improve systematicness
It can index.
The wherein described limited range enlargement unit 11 includes the 4th amplifier 22, the 5th amplifier 23, the second limiter 24, the
Six amplifiers 25, third limiter 26, the 7th amplifier 27 and the 4th limiter 28；As shown in figure 3, the functional unit is main
Function is to carry out power amplification to intermediate-freuqncy signal by casacade multi-amplifier, and limiter designs after an amplifier, and effect is to keep away
The input signal power for exempting to enter next stage amplifier is excessively high, causes amplifier and rear class digital processing chip to be saturated, after influencing
The digital processing of grade, and then influence system performance.
The brief operation principle of the present invention is as follows：It is controlled using parallel interface, passes through the first controllable attenuator of parallel port pair
3, first frequency synthesizer 7, the second controllable attenuator 10, second frequency synthesizer 14 etc. are controlled, and pass through being total to for each section
Same-action obtains required IQ baseband signals.
It can realize that miniaturization, low-power consumption, the C frequency ranges based on amplitude limiting processing of high jamming-to-signal ratio are anti-interference using the technical solution
Demodulate intermediate frequency unit.
Claims (3)
1. the anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing, including first filter (1), the first amplifier (2),
First controllable attenuator (3), the second amplifier (4), the first limiter (5), frequency mixer (6), first frequency synthesizer (7),
Three amplifiers (9), the second controllable attenuator (10), second filter (12), demodulator (13), second frequency synthesizer (14) and
Third filter (15), which is characterized in that further include switch filtering unit (8) and limited range enlargement unit (11)；Described first
Filter (1) is filtered the radiofrequency signal received, is exported to the first amplifier after filtering out band stray signal
(2)；First amplifier (2) is amplified filtered radiofrequency signal, and amplified radiofrequency signal is exported to first controllably
Attenuator (3)；First controllable attenuator (3) carries out power adjustment to amplified radiofrequency signal, by the radio frequency after power adjustment
Signal is exported to the second amplifier (4)；Second amplifier (4) is amplified the radiofrequency signal after power adjustment and exports to
One limiter (5)；First limiter (5) exports after carrying out amplitude limiting processing to the radiofrequency signal received to frequency mixer (6)；Mixing
Device (6) mixes the local oscillation signal that the radiofrequency signal received from the first limiter (5) is generated with first frequency synthesizer (7)
Frequency obtains intermediate-freuqncy signal, and intermediate-freuqncy signal is exported to switch filtering unit (8)；Switch filtering unit (8) passes through branch and switch
Intermediate-freuqncy signal is divided into two-way by switching, is filtered respectively to two-way intermediate-freuqncy signal by different filters, is filtered out band
It is outer it is spuious after output all the way intermediate-freuqncy signal to third amplifier (9)；Third amplifier (9) puts the intermediate-freuqncy signal received
It is exported to the second controllable attenuator (10) after big；Second controllable attenuator (10) carries out the amplified intermediate-freuqncy signal received
Power adjustment exports the intermediate-freuqncy signal after power adjustment to limited range enlargement unit (11)；Limited range enlargement unit (11) passes through more
The cascade of grade amplifier and limiter carries out amplitude limit and enhanced processing to the intermediate-freuqncy signal after power adjustment, and exports to second
Filter (12)；Second filter (12) is filtered the intermediate-freuqncy signal after limited range enlargement, filters out defeated after band stray signal
Go out to demodulator (13)；Demodulator (13) generates the filtered intermediate-freuqncy signal received and second frequency synthesizer (14)
Local oscillation signal obtains the IQ differential baseband signals needed for system, output to third filter (15) after being mixed；Third filters
Device (15) exports after being filtered to IQ differential baseband signals.
2. the anti-interference demodulation intermediate frequency unit of the C frequency ranges according to claim 1 based on amplitude limiting processing, it is characterised in that：Institute
The switch filtering unit (8) stated, including splitter (16), the 4th filter (17), the 5th filter (18), the 6th filter
(19), the 7th filter (20) and switch (21)；The intermediate-freuqncy signal of input is carried out branch by splitter (16), generates two-way intermediate frequency
Signal filters out band wherein intermediate-freuqncy signal is filtered through the 4th filter (17) and the 5th filter (18) successively all the way
Outer spuious rear output extremely switch (21)；Another way intermediate-freuqncy signal is carried out through the 6th filter (19) and the 7th filter (20) successively
It is filtered, filters out output extremely switch (21) after band stray；(21) are switched to carry out the two-way intermediate-freuqncy signal after being filtered
Selection, selection export all the way；Wherein, the 4th filter (17) and the 5th filter (18) and the 6th filter (19) and the 7th filter
The bandwidth of wave device (20) is different.
3. the anti-interference demodulation intermediate frequency unit of the C frequency ranges according to claim 1 based on amplitude limiting processing, it is characterised in that：Institute
The limited range enlargement unit (11) stated, including the 4th amplifier (22), the 5th amplifier (23), the second limiter (24), the 6th put
Big device (25), third limiter (26), the 7th amplifier (27) and the 4th limiter (28)；4th amplifier (22) and the 5th is put
Big device (23) is amplified the intermediate-freuqncy signal received successively, and amplified intermediate-freuqncy signal is exported to the second limiter
(24)；Second limiter (24) carries out amplitude limiting processing to the intermediate-freuqncy signal received and after the 6th amplifier (25) is amplified
It exports to third limiter (26)；Third limiter (26) carries out amplitude limiting processing to the intermediate-freuqncy signal received and through the 7th amplification
Device (27) exports after being amplified to the 4th limiter (28)；4th limiter (28) carries out amplitude limit to the intermediate-freuqncy signal received
It is exported after processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810445905.8A CN108631810A (en) | 2018-05-11 | 2018-05-11 | The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810445905.8A CN108631810A (en) | 2018-05-11 | 2018-05-11 | The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108631810A true CN108631810A (en) | 2018-10-09 |
Family
ID=63692871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810445905.8A Pending CN108631810A (en) | 2018-05-11 | 2018-05-11 | The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108631810A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203219288U (en) * | 2013-05-17 | 2013-09-25 | 成都中亚通茂科技有限公司 | Three-level superheterodyne receiver and local oscillation circuit thereof |
| CN203289419U (en) * | 2013-06-20 | 2013-11-13 | 成都九洲迪飞科技有限责任公司 | C-wave band miniature high sensitivity reception module |
| CN106411335A (en) * | 2016-06-21 | 2017-02-15 | 成都金本华电子有限公司 | Airborne send-receive channel of L and S frequency bands |
| CN107888273A (en) * | 2016-09-30 | 2018-04-06 | 南京誉葆科技有限公司 | A kind of link terminal radio-frequency channel |
-
2018
- 2018-05-11 CN CN201810445905.8A patent/CN108631810A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203219288U (en) * | 2013-05-17 | 2013-09-25 | 成都中亚通茂科技有限公司 | Three-level superheterodyne receiver and local oscillation circuit thereof |
| CN203289419U (en) * | 2013-06-20 | 2013-11-13 | 成都九洲迪飞科技有限责任公司 | C-wave band miniature high sensitivity reception module |
| CN106411335A (en) * | 2016-06-21 | 2017-02-15 | 成都金本华电子有限公司 | Airborne send-receive channel of L and S frequency bands |
| CN107888273A (en) * | 2016-09-30 | 2018-04-06 | 南京誉葆科技有限公司 | A kind of link terminal radio-frequency channel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6670901B2 (en) | Dynamic range on demand receiver and method of varying same | |
| CN108429594B (en) | High-performance channel simulator radio frequency transceiver applied to 5G communication | |
| CN107896116A (en) | A kind of Data-Link radio system | |
| CN109257063B (en) | Broadband channelization transceiver | |
| DE102005058459A1 (en) | Transceiver device and module | |
| CN104135301A (en) | Radio frequency receiver and receiving method | |
| CN102347778A (en) | Self-adapting interference cancellation device and debugging method thereof | |
| CN110190861A (en) | Millimeter wave broadband receiver | |
| CN111478711B (en) | Receiver and communication equipment | |
| CN111030725A (en) | Superheterodyne ultrashort wave transceiving channel system | |
| CN112688703A (en) | Miniaturized low-power consumption receiver | |
| CN114584164A (en) | Frequency band reconfigurable radio frequency receiver front end facing multi-standard communication | |
| CN104378139B (en) | The signal isolation method of microwave frequency source circuit and its main shake signal and local oscillation signal | |
| CN102611469B (en) | A kind of phase-shift filtering method | |
| CN116470924A (en) | Broadband full duplex receiver sharing interference elimination circuit | |
| CN112202409A (en) | Low noise amplification module, receiver and signal processing method | |
| CN108616283A (en) | The anti-interference radio frequency unit of Ka frequency ranges of jump and amplitude limiting processing is solved based on Ka | |
| CN114938204A (en) | SC wave band amplitude-phase consistent frequency conversion assembly | |
| CN102594379A (en) | Phase-shifting filter device and application thereof | |
| CN106549684A (en) | A kind of method of reseptance of two-band radiofrequency signal and its device, base station | |
| CN210444257U (en) | Two-channel S-band down converter | |
| CN108631810A (en) | The anti-interference demodulation intermediate frequency unit of C frequency ranges based on amplitude limiting processing | |
| CN213484821U (en) | Frequency conversion assembly for electronic warfare and surveillance equipment | |
| CN108390696B (en) | C-band miniaturized one-transmitting-four-receiving medium-frequency unit | |
| CN209844939U (en) | VHF microwave frequency hopping radio station receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181009 |