CN107707267A - A kind of zero intermediate frequency reciver - Google Patents
A kind of zero intermediate frequency reciver Download PDFInfo
- Publication number
- CN107707267A CN107707267A CN201711044027.0A CN201711044027A CN107707267A CN 107707267 A CN107707267 A CN 107707267A CN 201711044027 A CN201711044027 A CN 201711044027A CN 107707267 A CN107707267 A CN 107707267A
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- China
- Prior art keywords
- cavity
- local oscillator
- intermediate frequency
- frequency
- reciver
- Prior art date
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Classifications
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- 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
- H04B1/06—Receivers
- H04B1/08—Constructional details, e.g. cabinet
-
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
Abstract
A kind of zero intermediate frequency reciver, by optimizing receiving channel link, innovative design cavity geometry, using new frequency mixer placement scheme, innovate baffle shapes, the isolation of local oscillator and receives link is greatly improved, for there is the zero intermediate frequency reciver of PIN switches or attenuator in receiving channel, the video leakage of the intermediate frequency random waveform in receiver can be greatly reduced（Leaked including direct current video）, representative value is less than 1mVpp, and anti-leak result is obvious, provides support for high performance microwave system in particular high sensitivity zero intermediate frequency reciver system, has very strong practicality, versatility and application prospect.
Description
Technical field
The present invention relates to microwave circuits field, more particularly to a kind of zero intermediate frequency reciver.
Background technology
In receiver system, often require that the transmission to reception signal is controlled, such as Larger Dynamic decay and break-make are come
Realize the receiver electronic countermeasure function in radar, target seeker and fuse.PIN switches are using under the different biasings of PIN diode
Electrical characteristics made of microwave semiconductor control device, be widely used in " break-make " control of microwave signal, its " logical " means pair
Microwave signal is unattenuated, and " disconnected " means to the big decay of microwave signal, and its attenuation corresponds to the isolation index of PIN switches.And
Electrically controlled attenuator controls electrically controlled attenuator decay microwave signal by low frequency electrical signal, and never decaying to big decay can be real
It is existing.But PIN switches or electrically controlled attenuator can also couple when being realized to microwave signal and decaying and be unattenuated to local oscillator simultaneously
Local oscillation signal carry out decay and unattenuated modulation, local oscillation signal, will be when by frequency mixer and local oscillator down coversion after modulation
Intermediate frequency exports modulated signal, and the modulated signal is referred to as " video leakage ", and this part intermediate-freuqncy signal is mixed in useful intermediate-freuqncy signal,
Receiver system performance is influenceed, especially influences zero intermediate frequency reciver performance.
The method of intermediate-frequency cancellation or the high-pass filtering of generally use can only solve the video leakage of direct current property at present, because
Method comparison basis, and effect is limited, in the case of having PIN switches or attenuator in receiver, now intermediate frequency video is let out
Leak for random square-wave signal, the method failure.
The content of the invention
The present invention provides a kind of zero intermediate frequency reciver, and local oscillator isolation index is high, and intermediate frequency output video leakage is small, has very
Strong practicality, versatility and application prospect.
In order to achieve the above object, the present invention provides a kind of zero intermediate frequency reciver, comprising：
Box body, it is provided with receiving cavity, local oscillator cavity and intermediate frequency cavity, described receiving cavity, local oscillator cavity and intermediate frequency
Cavity is interconnected, receiving cavity connection receiving port, forms receiving channel, local oscillator cavity connection local oscillator port, forms local oscillator
Passage, intermediate frequency cavity connection IF interface, forms intermediate-frequency channel；
Frequency mixer, it is arranged in local oscillator cavity, and local oscillator port is connected by microstrip line；
Voltage-controlled attenuator or PIN switches, it is arranged in receiving cavity, and receiving port is connected by microstrip line；
At least one isolator, it is arranged in receiving cavity, positioned at voltage-controlled attenuator and frequency mixer, or PIN switches and mixing
Between device, the isolator connects the frequency mixer and voltage-controlled attenuator of both sides, or frequency mixer and PIN switches by microstrip line respectively,
The isolator is used to realize isolating between receiving channel and local oscillation channel；
At least one baffle plate, it is arranged in receiving cavity, positioned at voltage-controlled attenuator and frequency mixer, or PIN switches and frequency mixer
Between, there is perforate on baffle plate, for through microstrip line, the baffle plate be used to realize between receiving channel and local oscillation channel every
From；
Local oscillator module, it is arranged on box portion outside, and the local oscillator port of local oscillator cavity is connected to by low leakage radio frequency connector；
Driving plate, it is fixed on the box body back side；
Lid, it is arranged on the top surface of box body, and covers receiving cavity and local oscillator cavity.
Described zero intermediate frequency reciver can also include：Amplifier, it is arranged in local oscillator cavity, positioned at voltage-controlled attenuator
Between isolator, or PIN switches and isolator, the amplifier connects the isolator of both sides by microstrip line respectively and automatically controlled declined
Subtract device, or isolator and PIN switches.
Described frequency mixer uses passive Gilbert frequency mixers, improves the isolation between local oscillator port and prevention at radio-frequency port.
The power of described local oscillator module meets the requirement of frequency mixer local oscillation power.
Described receiving cavity and the height of local oscillator cavity are less than half microwave signal wavelength, and are more than in cavity most
The height of big device, the width of described receiving cavity is less than half microwave signal wavelength, and is more than 50 ohm microstrips
3 times of line width, the length of described local oscillator cavity is more than 1.5 times of wavelength, and the width of local oscillator cavity is less than half microwave
Signal wavelength, and 3 times of the line width more than 50 ohm microstrips.
Described frequency mixer is more than half wavelength apart from the distance of intermediate frequency cavity, frequency mixer apart from intermediate frequency cavity away from
Distance ratio from the local oscillator port with a distance from is 1:2.
The length of described baffle plate is equal to the width of receiving cavity, and the width of baffle plate is equal to the height of receiving cavity, baffle plate
Thickness be more than or equal to quarter-wave, the length of perforate is 3 times of the line width of 50 ohm microstrips on baffle plate, and width is micro-
3~5 times with line height.
The size of described lid meets receiving cavity and local oscillator cavity can be completely covered, and lid is apart from receiving cavity
It is more than or equal to quarter-wave with the edge of local oscillator cavity.
Described zero intermediate frequency reciver can also include：Cover plate, it is arranged on lid, for strengthening shielding properties.
Described cover plate is identical with lid size.
The present invention is by optimizing receiving channel link, innovative design cavity geometry, using new frequency mixer placement scheme, wound
New baffle shapes, the isolation of local oscillator and receives link is greatly improved, for having the zero of PIN switches or attenuator in receiving channel
Intermediate-frequency receiver, the video leakage of the intermediate frequency random waveform in receiver can be greatly reduced（Leaked including direct current video）, typical case
Value is less than 1mVpp, and anti-leak result is obvious, is provided for high performance microwave system in particular high sensitivity zero intermediate frequency reciver system
Support, has very strong practicality, versatility and an application prospect.
Brief description of the drawings
Fig. 1 is a kind of stereogram of zero intermediate frequency reciver provided by the invention.
Fig. 2 is the top view of box portion.
Fig. 3 is the stereogram of baffle plate.
Fig. 4 is the side view of baffle plate.
Embodiment
Below according to Fig. 1~Fig. 4, presently preferred embodiments of the present invention is illustrated.
Zero intermediate frequency reciver generation intermediate frequency, which exports the reason for video leaks, is：1st, local oscillation signal passes through link（Mainly TEM
Mould）Reverse transfer is to voltage-controlled attenuator（Or PIN switches）, video leakage is produced after being then mixed by modulation, can be with for this point
By in local oscillator and voltage-controlled attenuator（Or PIN switches）Between plus isolator suppress local oscillation signal reverse transfer, on the other hand
By voltage-controlled attenuator（Or PIN switches）Far as possible from local oscillator also for increasing local oscillation signal and voltage-controlled attenuator（Or PIN is opened
Close）Isolation.2nd, local oscillation signal passes through inner space radiation transmission to voltage-controlled attenuator（Or PIN switches）.Space in cavity
Radiation is only TE moulds and TM moulds, can be by being less than half wavelength by the width and high setting of local oscillator cavity, it becomes possible to
Largely suppress TE moulds and TM moulds.Baffle plate is added further to prevent local oscillation signal from passing through space spoke in receiving channel in addition
Penetrate and be transferred to voltage-controlled attenuator（Or PIN switches）.
As depicted in figs. 1 and 2, the present invention provides a kind of zero intermediate frequency reciver, comprising：
Box body 6, it is provided with receiving cavity 9, local oscillator cavity 10 and intermediate frequency cavity 14, described receiving cavity 9, local oscillator cavity
10 and intermediate frequency cavity 14 be interconnected, receiving cavity connection receiving port 12, formed receiving channel, local oscillator cavity 10 connect local oscillator
Port（Do not marked in figure）, local oscillation channel is formed, intermediate frequency cavity 14 connects IF interface（Do not marked in figure）, form intermediate frequency and lead to
Road；
Frequency mixer 1, it is arranged in local oscillator cavity 10, and local oscillator port is connected by microstrip line 11；
Voltage-controlled attenuator 4（Or PIN switches 4）, it is arranged in receiving cavity 9, and receiving port 12 is connected by microstrip line 11；
At least one isolator 2, it is arranged in receiving cavity 9, positioned at voltage-controlled attenuator 4（Or PIN switches 4）With frequency mixer 1
Between, the isolator 2 connects the frequency mixer 1 and voltage-controlled attenuator 4 of both sides by microstrip line 11 respectively（Or PIN switches 4）, should be every
It is used to realize isolating between receiving channel and local oscillation channel from device 2；
At least one baffle plate 5, it is arranged in receiving cavity 9, positioned at voltage-controlled attenuator 4（Or PIN switches 4）With frequency mixer 1 it
Between, there is perforate on baffle plate 5, for through microstrip line 11, the baffle plate 5 be used to realize between receiving channel and local oscillation channel every
From；
Local oscillator module 8, it is arranged on outside box body 6, and the local oscillator end of local oscillator cavity 10 is connected to by low leakage radio frequency connector 7
Mouthful；
Driving plate C, it is fixed on the back side of box body 6；
Lid A, it is arranged on the top surface of box body 6, and covers receiving cavity 9 and local oscillator cavity 10.
Further, described zero intermediate frequency reciver can also include：
Amplifier 3, it is arranged in local oscillator cavity 10, positioned at voltage-controlled attenuator 4（Or PIN switches 4）, should between isolator 2
Amplifier 3 connects the isolator 2 and voltage-controlled attenuator 4 of both sides by microstrip line 11 respectively（Or PIN switches 4）；
Cover plate B, it is arranged on lid A, for strengthening shielding properties.
In order to further improve the isolation between receiving channel and local oscillation channel, the video leakage of intermediate frequency output is reduced,
Following concrete restriction is done to the device of zero intermediate frequency reciver provided by the invention：
Described frequency mixer 1 uses passive Gilbert frequency mixers, improves the isolation between local oscillator port and prevention at radio-frequency port.
Device link order in receiving channel is arranged to voltage-controlled attenuator 4（Or PIN switches 4）→ amplifier 3 → isolation
2 → frequency mixer of device 1, isolator 2 can use 2 or 3 in the case of conditions permit, and such local oscillation signal passes through link reversal
It is transferred to voltage-controlled attenuator 4（Or PIN switches 4）When amplitude ignore substantially.
The power of described local oscillator module 8 meets the requirement of frequency mixer local oscillation power, and so, local oscillation signal enters local oscillation channel
After avoid the need for amplifying in addition.Using the microwave radiation local oscillator module in low leakage radio frequency connector 7 connection local oscillator module 8 and this
Shake the local oscillator port of cavity 10 so that is coupled to voltage-controlled attenuator 4（Or PIN switches 4）Signal will very little.
Described receiving cavity 9 and the height of local oscillator cavity 10 should be less than half microwave signal wavelength, and be more than chamber
The height of internal maximum device, the width of described receiving cavity 9 should be less than half microwave signal wavelength, and be more than 50 Europe
3 times of the line width of nurse microstrip line 11, ensure that cavity does not interfere with the transmission of normal electrical signal, the length of described local oscillator cavity 10
1.5 times of wavelength are should be greater than, are preferably the bigger the better, such local oscillator cavity 10 will suppress TE moulds and the transmission of TM moulds electromagnetic field, local oscillator
The width of cavity 10 should be less than half microwave signal wavelength, should be as small as possible in the case of conditions permit, but should be greater than
3 times of the line width of 50 ohm microstrips 11.
Described frequency mixer 1 should be greater than half wavelength apart from the distance of intermediate frequency cavity 14, and frequency mixer 1 is apart from intermediate frequency chamber
The distance of body and the distance ratio preferably 1 apart from local oscillator port:2, this allows for local oscillator of the local oscillator part signal in frequency mixer
Port can produce radiation, and device is relatively more in receiving channel, not necessarily can guarantee that the cavity of receiving portion meets that width is less than
Half wavelength, it can also be curbed accordingly even when frequency mixer local oscillator port produces radiation by local oscillator cavity, prevent local oscillation signal
It is radiated voltage-controlled attenuator 4（Or PIN switches 4）.
The length of described baffle plate 5 is equal to the width of receiving cavity 9, and the width of baffle plate 5 is equal to the height of receiving cavity 9,
The thickness of baffle plate 5 is more than or equal to quarter-wave, and the length of perforate is 3 times of the line width of 50 ohm microstrips 11 on baffle plate 5,
Width is 3~5 times of the height of microstrip line 11, and baffle plate 5 blocks local oscillation signal and passes through space radiation to voltage-controlled attenuator 4（Or PIN
Switch 4）.
Described lid A size meets receiving cavity 9 and local oscillator cavity 10 can be completely covered, and lid A distances connect
The edge for receiving cavity 9 and local oscillator cavity 10 is more than or equal to quarter-wave, is preferably the bigger the better, the shielding properties of such cover plate
More preferably, lid is fixed with box body by sunk screw.
Described cover plate B is identical with lid A sizes, and cover plate B can be by sintering, being bonded or means and the lid such as Laser seal welding
A and box body 6 connect, and two layers of cover plate is also for guarantee shielding properties.
As shown in Figure 1 to 4, in a preferred embodiment of the invention, the preparation process of zero intermediate frequency reciver is as follows：
Box body 6 is processed, receiving cavity 9 and the size of local oscillator cavity 10 require as follows in box body 6：Receiving cavity 9 and local oscillator cavity
10 height h should meet the height for being more than maximum device in cavity, and be less than half operation wavelength；The width of receiving cavity 9
Degree b should be less than half wavelength, preferably the smaller the better, but should ensure that width b is more than 3 times of 50 ohm of line widths of microstrip line；This
Shake the length of cavity 10（c+d）1.5 times of wavelength are should be greater than, are preferably the bigger the better；Feelings of the width a of local oscillator cavity 10 in conditions permit
Should be as small as possible under condition.
Local oscillator module 8 is arranged on the outside of box body 6, and the power of local oscillator module 8 meets the requirement of driving frequency mixer 1, local oscillator
Module 8 is connected with box body 6 uses the low leakage radio frequency connector 7 of advantages of good shielding performance；
Baffle plate 5 is installed in receiving cavity 9, the length b and width h of baffle plate 5 the width b and height h mono- with receiving cavity 9 respectively
Cause, the thickness of baffle plate 5 is not less than quarter-wave, and baffle plate 5 opens a rectangular channel in lower section side, for the cabling of microstrip line 11, square
The length f of shape groove is about 3 times or so 50 ohm microstrip line widths, and width g is 3 ~ 5 times of height of micro-strip plate 11, and the quantity of baffle plate 5 is not limited to
1.
Frequency mixer 1 is passive Gilbert frequency mixers, and frequency mixer 1 should be arranged in local oscillator cavity 10, and the distance of frequency mixer 1
The distance c of intermediate frequency cavity 14 should be greater than half wavelength, preferably distance c of the frequency mixer 1 away from intermediate frequency cavity 14 with away from local oscillator end
The distance d ratios about 1 of mouth：2.
Since receiving port 12, device erection sequence is followed successively by amplifier（If have）3 → isolator, 2 → frequency mixer 1, electricity
Control attenuator 4（Or PIN switches 4）It should be arranged on before isolator 2, be preferably provided at before amplifier 3, isolator 2 is in condition
2 or 3 can be used in the case of permission, other devices in addition to frequency mixer 1 are installed in receiving cavity 9.
Driving plate C is located at the back side of box body 6, and the device in receiving cavity 9 and local oscillator cavity 10 needs and the back side of box body 6
Driving plate C is connected when being connected by insulator 13.
When lid A is covered onto box body 6, receiving cavity 9 and local oscillator cavity 10 should be able to be covered, and from receiving cavity 9 and local oscillator
The Edge Distance e of cavity 10 is not less than quarter-wave, is preferably the bigger the better, and lid A is consolidated with box body 6 by sunk screw
Fixed, cover plate B is identical with lid A sizes, and cover plate B can be by sintering, being bonded or the means such as Laser seal welding are connected with box body 6.
The present invention is by optimizing receiving channel link, innovative design cavity geometry, using new frequency mixer placement scheme, wound
New baffle shapes, the isolation of local oscillator and receives link is greatly improved, for having the zero of PIN switches or attenuator in receiving channel
Intermediate-frequency receiver, the video leakage of the intermediate frequency random waveform in receiver can be greatly reduced（Leaked including direct current video）, typical case
Value is less than 1mVpp, and anti-leak result is obvious, is provided for high performance microwave system in particular high sensitivity zero intermediate frequency reciver system
Support, has very strong practicality, versatility and an application prospect.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of zero intermediate frequency reciver, it is characterised in that include：
Box body（6）, it is provided with receiving cavity（9）, local oscillator cavity（10）With intermediate frequency cavity（14）, described receiving cavity
（9）, local oscillator cavity（10）With intermediate frequency cavity（14）It is interconnected, receiving cavity connection receiving port（12）, receiving channel is formed,
Local oscillator cavity（10）Local oscillator port is connected, forms local oscillation channel, intermediate frequency cavity（14）IF interface is connected, forms intermediate-frequency channel；
Frequency mixer（1）, it is arranged on local oscillator cavity（10）In, pass through microstrip line（11）Connect local oscillator port；
Voltage-controlled attenuator（4）Or PIN switches（4）, it is arranged on receiving cavity（9）In, pass through microstrip line（11）Connect receiving terminal
Mouthful（12）；
At least one isolator（2）, it is arranged on receiving cavity（9）In, positioned at voltage-controlled attenuator（4）With frequency mixer（1）, or
PIN is switched（4）With frequency mixer（1）Between, the isolator（2）Pass through microstrip line respectively（11）Connect the frequency mixer of both sides（1）With
Voltage-controlled attenuator（4）, or frequency mixer（1）Switched with PIN（4）, the isolator（2）For realize receiving channel and local oscillation channel it
Between isolation；
At least one baffle plate（5）, it is arranged on receiving cavity（9）In, positioned at voltage-controlled attenuator（4）And frequency mixer（1）, or PIN
Switch（4）And frequency mixer（1）Between, baffle plate（5）Upper have perforate, for through microstrip line（11）, the baffle plate（5）For realizing
Isolating between receiving channel and local oscillation channel；
Local oscillator module（8）, it is arranged on box body（6）Outside, pass through low leakage radio frequency connector（7）It is connected to local oscillator cavity（10）
Local oscillator port；
Driving plate（C）, it is fixed on box body（6）The back side；
Lid（A）, it is arranged on box body（6）Top surface, and cover receiving cavity（9）With local oscillator cavity（10）.
2. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described zero intermediate frequency reciver can also include：
Amplifier（3）, it is arranged on local oscillator cavity（10）In, positioned at voltage-controlled attenuator（4）With isolator（2）, or PIN switches（4）With
Isolator（2）Between, the amplifier（3）Pass through microstrip line respectively（11）Connect the isolator of both sides（2）And voltage-controlled attenuator
（4）, or isolator（2）Switched with PIN（4）.
3. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described frequency mixer（1）Using passive Gilbert
Frequency mixer, improve the isolation between local oscillator port and prevention at radio-frequency port.
4. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described local oscillator module（8）Power meet it is mixed
The requirement of frequency device local oscillation power.
5. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described receiving cavity（9）With local oscillator cavity
（10）Height be less than half microwave signal wavelength, and more than the height of maximum device in cavity, described receiving cavity
（9）Width be less than half microwave signal wavelength, and be more than 50 ohm microstrips（11）3 times of line width, described sheet
Shake cavity（10）Length be more than 1.5 times of wavelength, local oscillator cavity（10）Width be less than half microwave signal wavelength, and greatly
In 50 ohm microstrips（11）3 times of line width.
6. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described frequency mixer（1）Apart from intermediate frequency cavity
（14）Distance be more than half wavelength, frequency mixer（1）Distance apart from intermediate frequency cavity and the distance ratio apart from local oscillator port
For 1:2.
7. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described baffle plate（5）Length be equal to reception cavity
Body（9）Width, baffle plate（5）Width be equal to receiving cavity（9）Height, baffle plate（5）Thickness be more than or equal to a quarter
Wavelength, baffle plate（5）The length of upper perforate is 50 ohm microstrips（11）3 times of line width, width is microstrip line（11）The 3 of height
~5 times.
8. zero intermediate frequency reciver as claimed in claim 1, it is characterised in that described lid（A）Size meet can be complete
All standing receiving cavity（9）With local oscillator cavity（10）, and lid（A）Apart from receiving cavity（9）With local oscillator cavity（10）Edge
More than or equal to quarter-wave.
9. zero intermediate frequency reciver as claimed in claim 8, it is characterised in that described zero intermediate frequency reciver can also include：
Cover plate（B）, it is arranged on lid（A）On, for strengthening shielding properties.
10. zero intermediate frequency reciver as claimed in claim 9, it is characterised in that described cover plate（B）With lid（A）Size phase
Together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044027.0A CN107707267B (en) | 2017-10-31 | 2017-10-31 | Zero intermediate frequency receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044027.0A CN107707267B (en) | 2017-10-31 | 2017-10-31 | Zero intermediate frequency receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107707267A true CN107707267A (en) | 2018-02-16 |
| CN107707267B CN107707267B (en) | 2020-07-31 |
Family
ID=61177309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711044027.0A Active CN107707267B (en) | 2017-10-31 | 2017-10-31 | Zero intermediate frequency receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107707267B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540421A (en) * | 2018-07-19 | 2018-09-14 | 电子科技大学 | A kind of I/Q unbalance compensating methods of broadband high-speed zero intermediate frequency reciver |
| CN109712937A (en) * | 2019-01-02 | 2019-05-03 | 北京振兴计量测试研究所 | A kind of eutectic carrier and microwave device |
| CN109873655A (en) * | 2019-02-18 | 2019-06-11 | 西安茂德通讯科技有限公司 | Microwave transmitting and receiving channel components |
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| CN201063632Y (en) * | 2007-06-18 | 2008-05-21 | 北京天瑞星际技术有限公司 | 13GHz SDH transceiver housing |
| CN201167322Y (en) * | 2008-03-18 | 2008-12-17 | 北京天瑞星际技术有限公司 | 23GHz SDH radio frequency unit and digital microwave outdoor unit |
| CN201821320U (en) * | 2010-09-29 | 2011-05-04 | 深圳国人通信有限公司 | Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station |
| CN201957009U (en) * | 2010-12-03 | 2011-08-31 | 南京誉葆科技有限公司 | Multi-channel integrated equiphase sum-and-difference receiving device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063632Y (en) * | 2007-06-18 | 2008-05-21 | 北京天瑞星际技术有限公司 | 13GHz SDH transceiver housing |
| CN201167322Y (en) * | 2008-03-18 | 2008-12-17 | 北京天瑞星际技术有限公司 | 23GHz SDH radio frequency unit and digital microwave outdoor unit |
| CN201821320U (en) * | 2010-09-29 | 2011-05-04 | 深圳国人通信有限公司 | Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station |
| CN201957009U (en) * | 2010-12-03 | 2011-08-31 | 南京誉葆科技有限公司 | Multi-channel integrated equiphase sum-and-difference receiving device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540421A (en) * | 2018-07-19 | 2018-09-14 | 电子科技大学 | A kind of I/Q unbalance compensating methods of broadband high-speed zero intermediate frequency reciver |
| CN109712937A (en) * | 2019-01-02 | 2019-05-03 | 北京振兴计量测试研究所 | A kind of eutectic carrier and microwave device |
| CN109712937B (en) * | 2019-01-02 | 2020-12-18 | 北京振兴计量测试研究所 | Eutectic carrier and microwave device |
| CN109873655A (en) * | 2019-02-18 | 2019-06-11 | 西安茂德通讯科技有限公司 | Microwave transmitting and receiving channel components |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107707267B (en) | 2020-07-31 |
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