CN107592126A - A kind of radio-frequency receiving-transmitting channel cellular construction - Google Patents
A kind of radio-frequency receiving-transmitting channel cellular construction Download PDFInfo
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- CN107592126A CN107592126A CN201710841800.XA CN201710841800A CN107592126A CN 107592126 A CN107592126 A CN 107592126A CN 201710841800 A CN201710841800 A CN 201710841800A CN 107592126 A CN107592126 A CN 107592126A
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- module
- receiving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a kind of radio-frequency receiving-transmitting channel cellular construction, including A faces and B faces；The A faces include the first shielding cavity and secondary shielding cavity, transmitting-receiving ifd module is provided with first shielding cavity, the power supply and the radiofrequency signal interface of control signal interface and transmitting-receiving ifd module of transmitting-receiving ifd module are provided with transmitting-receiving ifd module, RF receiving and transmission module is provided with secondary shielding cavity, the radiofrequency signal interface of bounce frequency filter and RF receiving and transmission module on RF receiving and transmission module is provided with RF receiving and transmission module.The present invention is saved installing space, while high integration, high electrical-magnetic compatibility effect is realized, is also achieved the miniaturization and lightweight of structure using module connection plug-in unit make-up mode.
Description
Technical field
The present invention relates to a kind of radio-frequency receiving-transmitting channel cellular construction, belongs to wireless communication RF transmitting-receiving subassembly technical field.
Background technology
Radio-frequency receiving-transmitting channel unit is the key component in wireless communication system group-net communication, and existing radio-frequency receiving-transmitting component connects
Receive and launch independent printed board design, receiving module connects with the interface of transmitter module and control signal is complicated so that two
Independent box body structure occupancy complete machine space is big, and printed board design method isolation is poor, Electro Magnetic Compatibility is poor.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of radio-frequency receiving-transmitting channel cellular construction, a kind of radio frequency is received
Transmit cellular construction and overcome the problem of existing radio-frequency receiving-transmitting assembly volume is big, Electro Magnetic Compatibility is poor, there is provided a kind of integrated level height,
Electromagnetism Electro Magnetic Compatibility is excellent, a kind of light-weighted radio-frequency receiving-transmitting channel cellular construction of High Density Integration high electrical-magnetic compatibility.
The present invention is achieved by the following technical programs.
A kind of radio-frequency receiving-transmitting channel cellular construction provided by the invention, including A faces and B faces；The A faces include the first shielding
Cavity and secondary shielding cavity, the first shielding cavity is interior to be provided with transmitting-receiving ifd module, is provided with transmitting-receiving ifd module in receiving and dispatching
The power supply and control signal interface of frequency module and the radiofrequency signal interface of transmitting-receiving ifd module, secondary shielding cavity is interior to be provided with radio frequency
Transceiver module, the radiofrequency signal of bounce frequency filter and RF receiving and transmission module on RF receiving and transmission module is provided with RF receiving and transmission module
Interface；The B faces include the 3rd shielding cavity, the 4th shielding cavity and the 5th shielding cavity, are provided with the 3rd shielding cavity upper
Down conversion module, Up/Down Conversion module are provided with the radiofrequency signal interface of Up/Down Conversion module, frequency are provided with the 4th shielding cavity
Rate source module, frequency source module are provided with the radiofrequency signal interface of frequency source module, control module are provided with the 5th shielding cavity,
Control module is provided with the transmitting-receiving intermediate frequency on the RF receiving and transmission module power supply and control signal interface, control module in control module
Modular power source and control signal interface and Channel Elements power supply and control signal interactive interface；The A faces and B faces are connected by dividing plate
Connect.
The dividing plate is shielding slider.
First shielding cavity and secondary shielding cavity are arranged in parallel.
The one end in the A faces and B faces is equipped with handle.
Channel Elements transmitting radiofrequency signal output interface is sequentially provided with the handle in the A faces or B faces, Channel Elements receive
Radiofrequency signal input interface, Channel Elements emission medium-frequency signal input interface, Channel Elements receiving intermediate frequency signal output interface and
Channel Elements disturb receiving intermediate frequency signal output interface.
First shielding cavity, secondary shielding cavity, the 3rd shielding cavity, the 4th shielding cavity, the 5th shielding cavity
It is the cavity of independent electromagnetic shielding.
The radio frequency on the radiofrequency signal interface for receiving and dispatching ifd module, RF receiving and transmission module on the transmitting-receiving ifd module is received
The radiofrequency signal interface for sending out module passes through the radiofrequency signal radiofrequency signal with the Up/Down Conversion module in Up/Down Conversion module respectively
Interface connects, and the radiofrequency signal interface of the Up/Down Conversion module in Up/Down Conversion module passes through in radiofrequency signal and frequency source module
Frequency source module radiofrequency signal interface connection.
On the power supply and control signal interface, RF receiving and transmission module of transmitting-receiving ifd module on the transmitting-receiving ifd module
Bounce frequency filter and the transmitting-receiving ifd module power supply and control signal in the control module in control module on RF receiving and transmission module
Interface connects with the RF receiving and transmission module power supply in the control module in control module and control signal interface, the 3rd shielding cavity
Frequency source module in interior Up/Down Conversion module, the 4th shielding cavity with the Channel Elements power supply in control module and control
Signal interaction interface connects, and is equipped with Up/Down Conversion module and frequency source module and Channel Elements power supply and control signal friendship
The interface of mutual interface pairing.
The radio frequency on the radiofrequency signal interface for receiving and dispatching ifd module, RF receiving and transmission module on the transmitting-receiving ifd module is received
Send out the radiofrequency signal interface of module, on the radiofrequency signal interface and Up/Down Conversion module of frequency source module on frequency source module
The radiofrequency signal interface of Up/Down Conversion module in module printed board, interconnects radio frequency electrical using superminiature radio frequency connector welding
Cable uses the semi-rigid radio-frequency cable without insulating outer protective cover, dividing plate of the plug and cable matched between A faces, B faces
On be provided with the conductive trough to match with radio-frequency cable outside dimension.
The transmitting-receiving ifd module, RF receiving and transmission module, frequency source module, Up/Down Conversion module are pressing close to cavity mounting surface
Mounting related components, each module printed board do not press close to large area between the side of cavity mounting surface and mounting surface and are grounded and apply for side
Cover solder mask.
The beneficial effects of the present invention are：
1. each module is installed on independent shielding cavity, the back-to-back form installation of five cavitys, structure two sides is made full use of
Increase module capability of electromagnetic shielding, using module connect plug-in unit make-up mode, save installing space, realize high integration,
While high electrical-magnetic compatibility effect, the miniaturization and lightweight of structure are also achieved；
2. transmitting-receiving ifd module, RF receiving and transmission module, Up/Down Conversion module, frequency source module press close to cavity mounting surface uneasiness
Component is filled, module printed board is pressed close to cavity mounting surface large area ground connection and coating solder mask, realized in each module printed board
Heater members heat is transferred to each cavity mounting surface by printed board solder mask, then is transferred to Channel Elements structure, effectively solves
Each module printed board heat dissipation problem；
3. each piece of printed board cavity mounting surface large area ground connection, increases printed board contact area, effectively solves module and mould
Block cascades Electro Magnetic Compatibility.
Brief description of the drawings
Fig. 1 is the structural representation in A faces of the present invention；
Fig. 2 is the structural representation in B faces of the present invention；
Fig. 3 is input/output interface board structural representation of the present invention；
In figure：The shielding cavities of 1- first, 2- secondary shielding cavitys, the shielding cavities of 3- the 3rd, the shielding cavities of 4- the 4th, 5-
Five shielding cavities, 6- transmitting-receiving ifd modules, 7- RF receiving and transmission modules, 8- frequency source modules, 9- Up/Down Conversion modules, 10- controls
Module, bounce frequency filter on 11- RF receiving and transmission modules, 12- receive and dispatch the power supply and control signal interface of ifd module, 13- controls
RF receiving and transmission module power supply and control signal interface in module, transmitting-receiving ifd module power supply and control in 14- control modules
Signaling interface, 15- receive and dispatch the radiofrequency signal interface of ifd module, the radiofrequency signal interface of 16- RF receiving and transmission modules, above and below 17-
The radiofrequency signal interface of frequency-variable module, the radiofrequency signal interface of 18- frequency source modules, 19- Channel Elements power supply and control signal
Interactive interface, 20- Channel Elements transmitting radiofrequency signal output interface, 21- Channel Elements receive radiofrequency signal input interface, 22-
Channel Elements emission medium-frequency signal input interface, 23- Channel Elements receiving intermediate frequency signal output interfaces, the interference of 24- Channel Elements
Receiving intermediate frequency signal output interface, 25- handles.
Embodiment
Be described further below technical scheme, but claimed scope be not limited to it is described.
As depicted in figs. 1 and 2, a kind of radio-frequency receiving-transmitting channel cellular construction, including A faces and B faces；The A faces include first
Shielding cavity 1 and secondary shielding cavity 2,1 interior be provided with of the first shielding cavity are received and dispatched ifd module 6, set on transmitting-receiving ifd module 6
There are the power supply and the radiofrequency signal interface 15 of control signal interface 12 and transmitting-receiving ifd module of transmitting-receiving ifd module, secondary shielding chamber
RF receiving and transmission module 7 is provided with body 2, bounce frequency filter 11 and radio frequency on RF receiving and transmission module are provided with RF receiving and transmission module 7
The radiofrequency signal interface 16 of transceiver module；The B faces include the 3rd shielding cavity 3, the 4th shielding cavity 4 and the 5th shielding cavity
5, be provided with Up/Down Conversion module 9, radiofrequency signal of the Up/Down Conversion module 9 provided with Up/Down Conversion module in the 3rd shielding cavity 3
Interface 17, be provided with frequency source module 8 in the 4th shielding cavity 4, radiofrequency signal of the frequency source module 8 provided with frequency source module connects
Mouthfuls 18, be provided with control module 10 in the 5th shielding cavity 5, the RF receiving and transmission module that control module 10 is provided with control module is electric
Transmitting-receiving ifd module power supply and control signal interface 14 and Channel Elements power supply on source and control signal interface 13, control module
And control signal interactive interface 19；The A faces are connected with B faces by dividing plate.
The transmitting-receiving ifd module 6 is used to complete the low noise amplification of transmitting-receiving intermediate-freuqncy signal, filtering, automatic growth control etc.
Function, RF receiving and transmission module 7 are used to complete the functions such as the low noise amplification of transceiving radio frequency signal, filtering, detection, frequency-selecting, up and down
Frequency-variable module 9 is used to receive the function such as the down coversion of radiofrequency signal and the up-conversion of transmission signal, filtering, amplification, frequency source mould
Block 8 is used to provide the local frequency source of secondary needed for frequency-variable module, and control module 10 is used to complete transmitting-receiving ifd module 6, radio-frequency receiving-transmitting
The functions such as module 7, frequency source module 8, the power supply of Up/Down Conversion module 9 provide, control signal is interactive and feedback information gathers.
The dividing plate is shielding slider.
First shielding cavity 1 and secondary shielding cavity 2 are arranged in parallel, save space, expand erection space.
The one end in the A faces and B faces is equipped with handle 25.
Channel Elements transmitting radiofrequency signal output interface 20, Channel Elements are sequentially provided with the handle 25 in the A faces or B faces
It is defeated to receive radiofrequency signal input interface 21, Channel Elements emission medium-frequency signal input interface 22, Channel Elements receiving intermediate frequency signal
Outgoing interface 23 and Channel Elements interference receiving intermediate frequency signal output interface 24, as shown in Figure 3.
First shielding cavity 1, secondary shielding cavity 2, the 3rd shielding cavity 3, the shielding of the 4th shielding cavity the 4, the 5th
Cavity 5 is the cavity of independent electromagnetic shielding.
Penetrating on the radiofrequency signal interface 15 for receiving and dispatching the transmitting-receiving ifd module on ifd module 6, RF receiving and transmission module 7
The radiofrequency signal interface 16 of frequency transceiver module is penetrated with Up/Down Conversion module in Up/Down Conversion module 9 respectively by radiofrequency signal
Frequency signaling interface 17 connects, the radiofrequency signal interface 17 of the Up/Down Conversion module in Up/Down Conversion module 9 by radiofrequency signal with
The radiofrequency signal interface 18 of frequency source module on frequency source module 8 connects.
The power supply and control signal interface 12, RF receiving and transmission module 7 of transmitting-receiving ifd module on the transmitting-receiving ifd module 6
On RF receiving and transmission module on transmitting-receiving ifd module power supply in control module in bounce frequency filter 11 and control module 10 and
RF receiving and transmission module power supply and control signal interface 13 in control module on control signal interface 14 and control module 10 connect
Connect, realize that the power supply between transmitting-receiving ifd module 6, RF receiving and transmission module 7 and control module 10 and control signal connect, the 3rd screen
Cover the Up/Down Conversion module 9 in cavity 3, the frequency source module 8 in the 4th shielding cavity 4 with the channel list in control module 10
First power supply and control signal interactive interface 19 connect, and are equipped with Up/Down Conversion module 9 and frequency source module 8 and Channel Elements
The interface that power supply and control signal interactive interface 19 match, realize frequency source module 8, Up/Down Conversion module 9 and control module 10
Between power supply connected with control signal.
Penetrating on the radiofrequency signal interface 15 for receiving and dispatching the transmitting-receiving ifd module on ifd module 6, RF receiving and transmission module 7
The radiofrequency signal interface 16 of frequency transceiver module, the radiofrequency signal interface 18 of the frequency source module on frequency source module 8 and change up and down
The radiofrequency signal interface 17 of Up/Down Conversion module on frequency module 9 is using superminiature radio frequency connector welding in module printed board
On, module printed board uses printed board of the material for FRA, and interconnection radio-frequency cable uses to be penetrated without the semi-rigid of insulating outer protective cover
Frequency cable, it is ensured that, improve Electro Magnetic Compatibility, the plug and electricity matched between radio-frequency cable external shielding layer and conductive trough adequately grounded
Cable is provided with the conductive trough to match with radio-frequency cable outside dimension on the dividing plate between A faces, B faces, realizes intermodule radio frequency
Signal transmits.
The transmitting-receiving ifd module 6, RF receiving and transmission module 7, frequency source module 8, Up/Down Conversion module 9 are pressing close to cavity peace
Mounting related components, each module printed board are not pressed close to large area between the side of cavity mounting surface and mounting surface and are grounded for the side in dress face
And solder mask is coated, realize that the heater members heat in each printed board is transferred to each cavity mounting surface by printed board solder mask,
Channel Elements structure is transferred to again, efficiently solves each printed board heat dissipation problem, meanwhile, the big face of module printed board cavity mounting surface
Product ground connection, increase module printed board contact area, effectively solve module and module-cascade Electro Magnetic Compatibility.
Further, the operation principle of each module is as follows：
The operation principle of RF receiving and transmission module 7：During in reception state, under the control of control module 10, radio frequency reception letter
Number self-channel unit receives radiofrequency signal input interface 21 and inputted to RF receiving and transmission module 7, is handled through amplitude limiter circuit, frequency-selecting filter
Radio frequency receiving signal is transmitted into supreme down conversion module 9 after ripple, low noise amplification, input AGC controls；During in emission state,
Under the control of control module 10, after radio frequency transmissions that Up/Down Conversion module 9 is exported carry out frequency-selecting, filter amplifying processing
Transmit to Channel Elements transmitting radiofrequency signal output interface 20.
The operation principle of Up/Down Conversion module 9：During in reception state, under the control of control module 10, by radio-frequency receiving-transmitting
The radiofrequency signal that module 7 exports carries out down coversion, filtering, low noise amplification with the local oscillation frequency signal that frequency source module 8 exports
It is that receiving intermediate frequency signal is transmitted to transmitting-receiving ifd module 6 Deng processing；During in emission state, under the control of control module 10,
Ifd module 6 the emission medium-frequency signal exported and the local oscillation frequency signal that frequency source module 8 exports will be received and dispatched and carry out up-conversion, filter
The processing such as ripple, low noise amplification are that radio frequency transmissions are transmitted to RF receiving and transmission module 7.
Receive and dispatch the operation principle of ifd module 6：During in reception state, under the control of control module 10, by Up/Down Conversion
The processing such as the receiving intermediate frequency signal that module 9 exports is filtered, low noise amplification, VGA amplification, AGC processing are that main machine regulation is special
The receiving intermediate frequency signal of property is transmitted to Channel Elements receiving intermediate frequency signal output interface 23；During in emission state, in control mould
Under the control of block 10, the emission medium-frequency signal that self-channel unit emission medium-frequency signal input interface 22 exports is filtered, be low
Supreme down conversion module 9 is transmitted after the processing such as noise amplification, numerical control attenuation.
The operation principle of frequency source module 8：Under the control of control module 10, the regulation needed for output Up/Down Conversion module 9
The local oscillation frequency signal of characteristic, the local oscillation frequency signal exported with frequency source module 8.
In summary, the present invention is by using cavity counterpart connected mode described in structure two sides, so as to improve module electricity
Magnetic compatibility, reduces module overall dimensions, realizes the High Density Integration of whole radio-frequency receiving-transmitting channel unit and high electromagnetic compatibility
Property and miniaturization, lightweight, and each module printed board material selection FRA, cause that reliability is lifted while cost reduces again, enter
One step has isolated cavity, improves Electro Magnetic Compatibility, it is ensured that radio-frequency receiving-transmitting channel unit meets the complicated electricity of wireless communication system
Requirement under magnetic environment.
Claims (10)
1. a kind of radio-frequency receiving-transmitting channel cellular construction, including A faces and B faces, it is characterised in that：The A faces include the first shielding cavity
Body (1) and secondary shielding cavity (2), the first shielding cavity (1) is interior to be provided with transmitting-receiving ifd module (6), in transmitting-receiving ifd module (6)
The power supply and control signal interface (12) and the radiofrequency signal interface (15) for receiving and dispatching ifd module of transmitting-receiving ifd module are provided with, the
RF receiving and transmission module (7) is provided with two shielding cavities (2), frequency hopping on RF receiving and transmission module is provided with RF receiving and transmission module (7)
The radiofrequency signal interface (16) of wave filter (11) and RF receiving and transmission module；The B faces include the 3rd shielding cavity (3), the 4th screen
Cavity (4) and the 5th shielding cavity (5) are covered, Up/Down Conversion module (9), Up/Down Conversion module are provided with the 3rd shielding cavity (3)
(9) the radiofrequency signal interface (17) of Up/Down Conversion module is provided with, is provided with frequency source module (8) in the 4th shielding cavity (4), frequency
Rate source module (8) is provided with the radiofrequency signal interface (18) of frequency source module, and control module is provided with the 5th shielding cavity (5)
(10), control module (10) is provided with RF receiving and transmission module power supply and control signal interface (13), control mould in control module
Transmitting-receiving ifd module power supply and control signal interface (14) and Channel Elements power supply and control signal interactive interface (19) on block；
The A faces are connected with B faces by dividing plate.
2. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：The dividing plate is shielding slider.
3. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：First shielding cavity (1) and
Secondary shielding cavity (2) is arranged in parallel.
4. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：The one end in the A faces and B faces is all provided with
There is handle (25).
5. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 4, it is characterised in that：The handle (25) in the A faces or B faces
On be sequentially provided with Channel Elements transmitting radiofrequency signal output interface (20), Channel Elements receive radiofrequency signal input interface (21),
Channel Elements emission medium-frequency signal input interface (22), Channel Elements receiving intermediate frequency signal output interface (23) and Channel Elements are done
Disturb receiving intermediate frequency signal output interface (24).
6. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：First shielding cavity (1),
Two shielding cavities (2), the 3rd shielding cavity (3), the 4th shielding cavity (4), the 5th shielding cavity (5) are independent electromagnetic shielding
Cavity.
7. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：On the transmitting-receiving ifd module (6)
The radiofrequency signal interface (15) of transmitting-receiving ifd module, the radiofrequency signal of RF receiving and transmission module on RF receiving and transmission module (7) connects
Mouth (16) is connected by radiofrequency signal interface (17) of the radiofrequency signal respectively with the Up/Down Conversion module in Up/Down Conversion module (9)
Connect, the radiofrequency signal interface (17) of the Up/Down Conversion module in Up/Down Conversion module (9) passes through radiofrequency signal and frequency source module
(8) radiofrequency signal interface (18) connection of the frequency source module on.
8. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：On the transmitting-receiving ifd module (6)
Transmitting-receiving ifd module power supply and control signal interface (12), RF receiving and transmission module (7) on RF receiving and transmission module on frequency hopping
Transmitting-receiving ifd module power supply in control module and control signal interface (14) in wave filter (11) and control module (10) and
RF receiving and transmission module power supply in control module and control signal interface (13) connection in control module (10), the 3rd shielding cavity
The frequency source module (8) in Up/Down Conversion module (9), the 4th shielding cavity (4) in body (3) with control module (10)
Channel Elements power supply and control signal interactive interface (19) connection, are all provided with Up/Down Conversion module (9) and frequency source module (8)
There is the interface with Channel Elements power supply and control signal interactive interface (19) pairing.
9. radio-frequency receiving-transmitting channel cellular construction as claimed in claim 1, it is characterised in that：On the transmitting-receiving ifd module (6)
The radiofrequency signal interface (15) of transmitting-receiving ifd module, the radiofrequency signal of RF receiving and transmission module on RF receiving and transmission module (7) connects
It is upper and lower on the radiofrequency signal interface (18) and Up/Down Conversion module (9) of mouthful (16), frequency source module on frequency source module (8)
The radiofrequency signal interface (17) of frequency-variable module in module printed board, interconnects radio frequency electrical using superminiature radio frequency connector welding
Cable uses the semi-rigid radio-frequency cable without insulating outer protective cover, dividing plate of the plug and cable matched between A faces, B faces
On be provided with the conductive trough to match with radio-frequency cable outside dimension.
10. the radio-frequency receiving-transmitting channel cellular construction as described in claim 1 or 9, it is characterised in that：The transmitting-receiving ifd module
(6), RF receiving and transmission module (7), frequency source module (8), Up/Down Conversion module (9) are not installed in the side for pressing close to cavity mounting surface
Component, each module printed board press close to large area between the side of cavity mounting surface and mounting surface and are grounded and coat solder mask.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710841800.XA CN107592126B (en) | 2017-09-18 | 2017-09-18 | Radio frequency receiving and transmitting channel unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710841800.XA CN107592126B (en) | 2017-09-18 | 2017-09-18 | Radio frequency receiving and transmitting channel unit |
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| Publication Number | Publication Date |
|---|---|
| CN107592126A true CN107592126A (en) | 2018-01-16 |
| CN107592126B CN107592126B (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710841800.XA Active CN107592126B (en) | 2017-09-18 | 2017-09-18 | Radio frequency receiving and transmitting channel unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109803487A (en) * | 2019-02-18 | 2019-05-24 | 西安茂德通讯科技有限公司 | Microwave transmitting and receiving component |
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