CN218412928U - Millimeter wave receiving and transmitting front end of improved active human body security inspection imaging system - Google Patents
Millimeter wave receiving and transmitting front end of improved active human body security inspection imaging system Download PDFInfo
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- CN218412928U CN218412928U CN202221935992.3U CN202221935992U CN218412928U CN 218412928 U CN218412928 U CN 218412928U CN 202221935992 U CN202221935992 U CN 202221935992U CN 218412928 U CN218412928 U CN 218412928U
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Abstract
The utility model relates to a millimeter wave technical field more specifically relates to an active human safety inspection imaging system's of improved generation millimeter wave receiving and dispatching front end. The system comprises a Ka-band millimeter wave transceiving antenna array, a Ka-band millimeter wave transceiving switch network, a Ka-band millimeter wave transceiver module and a secondary power supply module; the millimeter wave transceiver switch network is used for connecting the millimeter wave transceiver antenna array and the millimeter wave transceiver module, the antenna array is redesigned according to system use optimization, a unique antenna isolation structure is added, the millimeter wave transceiver is optimized and improved integrally and reasonably from the structure and the circuit, and performance indexes are improved. The primary switch adopts a new chip process and structural design, and the secondary switch network adopts a transmitting-receiving integrated structure and circuit design. The secondary power supply module and the original power distribution board are integrated, so that the assembly and wiring are facilitated. The system is simple and convenient to install and adjust, the index is improved, the cost is reduced, and the method has higher industrialization advantages.
Description
Technical Field
The utility model relates to a millimeter wave technical field more specifically relates to an active human safety inspection imaging system's of improved generation millimeter wave receiving and dispatching front end.
Background
The millimeter wave receiving and transmitting front end is the core equipment of the millimeter wave security check imaging system, and the millimeter wave imaging technology has become a novel mainstream security check technical means at present. With the great development of semiconductor technology, the commercialization of millimeter wave chips of semiconductor companies at home and abroad has greatly reduced cost of millimeter wave chips, and more selective devices and processes are provided, so that a new scheme is formed for the framework optimization of a security inspection system and the optimization and improvement of each subsystem after the experiment, test and verification of small-batch production of the current security inspection imaging equipment, in particular to a millimeter wave transceiving front end of core equipment of the millimeter wave security inspection imaging system. The radar system, scheme, modularization, index optimization, structure optimization and electrical optimization adopted by the millimeter wave transceiving front end improve the quality of the millimeter wave security check imaging system. And the technology upgrading based on the prior art has great promotion on industrialization, cost and localization. The upgrading improvement of the millimeter wave transceiver front-end equipment is based on the technical level, process, device, assembly condition, test and reliability verification of the present equipment, and the upgrading of the architecture and the module is carried out, which mainly comprises: the optimization design process of the antenna array, the receiving and transmitting isolation degree of the antenna and the unit number of the antenna array. The secondary network switch adopts a receiving-transmitting integrated electrical and control structure, the primary network switch is optimized according to the unit and device process design, the relevant indexes of the switch meet the equipment requirements, and the cost is effectively controlled. The transceiver module adopts a design scheme of high and low frequency, control and radio frequency separation, and signal index parameters and reliability are effectively improved. The power supply module is integrated, so that the assembly complexity is reduced, and the production efficiency is higher.
As an important component of the human body security check imaging system, the improvement and optimization of the millimeter wave transmitting and receiving front end is core equipment for improving indexes of the human body security check imaging system, is also a key point of research and development improvement of the product, has key decisive effects on technical indexes, cost, reliability, process assembly and maintainability of the human body security check system, and meets technical and related comprehensive requirements through improvement of a system architecture and optimization design of all subsystem modules. The optimal solution of technical realization is achieved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model adopts the technical scheme that:
a millimeter wave transceiving front end of an improved active human body security check imaging system comprises,
the optimized design of a millimeter wave transceiving antenna array of a Ka waveband adopts a transceiving antenna array isolation design, the spacing between transceiving antenna arrays is 25mm, a metal grid is used for partitioning and isolating, the millimeter wave transceiving antenna array comprises a transmitting antenna array and a receiving antenna array, the transmitting antenna array at least comprises a transmitting antenna sub-array consisting of 16 transmitting units, and the receiving antenna array at least comprises a transmitting antenna sub-array consisting of 16 receiving units;
the system comprises a Ka-band millimeter wave transceiving switch network, a primary switch, a secondary switch, a millimeter wave circuit, a digital control switch circuit, 12 primary switch channels and 16 secondary switches, wherein the primary switch adopts a transceiving split scheme, the secondary switch adopts a transceiving integrated scheme, and the transceiving integrated switch network is compatible with the millimeter wave circuit and the digital control switch circuit;
the Ka-band millimeter wave transceiver module adopts a design scheme that a frequency tracking module and a transceiver component are separately arranged, high frequency and low frequency are separately designed, and control and radio frequency are independently designed;
the power supply module is used for directly outputting power supply requirements required by the relevant modules;
the millimeter wave transceiving switch network is used for connecting the millimeter wave transceiving antenna array and the millimeter wave transceiver module.
Preferably, the transmitting antenna array comprises a one-dimensional uniform linear array consisting of 12 transmitting antenna sub-arrays; the receiving antenna array comprises a one-dimensional uniform linear array consisting of 12 receiving antenna sub-arrays.
Preferably, the millimeter wave transceiving switch network is divided into a transmitting switch network and a receiving switch network, and the transmitting switch network and the receiving switch network are both composed of 2-level switch networks.
Preferably, the transmitting switch network consists of a transmitting primary switch network with 1 single-pole twelve-throw switch SP12T and a transmitting secondary switch network cascaded by 12 double-pole 16-throw switches SP16T-Tx, and the transmitting primary switch network and the transmitting secondary switch network are connected through a millimeter wave coaxial cable; the receiving switch network consists of a receiving primary switch network with 1 single-pole twelve-throw switch SP12T and a receiving secondary switch network with 12 single-pole twelve-throw switches SP16T-Rx cascade connection, and the receiving primary switch network and the receiving secondary switch network are connected through a millimeter wave coaxial cable.
Preferably, the millimeter wave transceiver module is connected to the transmitting antenna array through a transmitting switch network, and the receiving antenna array is switched by the receiving switch network to sequentially receive echo signals backscattered by the target and enter the millimeter wave transceiver module.
Preferably, the power module inputs + 12V, outputs + 5V-5V, and supplies to the millimeter wave receiving and transmitting switch network and the millimeter wave receiving and transmitting module.
Preferably, the distance between the transmitting units is 1 time of millimeter wave wavelength, and the distance between the receiving units is 1 time of millimeter wave wavelength.
Preferably, the transmitting antenna array and the receiving antenna array are parallel to each other, the distance between the transmitting antenna array and the receiving antenna array is about 2.5 times of millimeter wave wavelength, and the transmitting antenna array and the receiving antenna array are staggered by 0.5 times of millimeter wave wavelength along the array arrangement direction.
Preferably, the millimeter wave transceiver module is composed of a frequency tracking module and a transceiver module,
the frequency synthesis module consists of a frequency source, an amplifier, a power divider, a demodulator, a DDS, a phase-locked loop, a filter and a frequency multiplication filtering part, the DDS and the phase-locked loop are triggered and controlled through an external control signal to generate required frequency band frequency, the frequency band frequency is divided into a plurality of corresponding paths of signals through the power divider, and then different output signals are subjected to amplification filtering demodulation frequency multiplication and output to a transceiving component or are directly output;
the transceiver component consists of an amplifier, a frequency mixer, an orthogonalizer, a filter and a frequency multiplier, and obtains a designed index signal by amplifying, filtering, frequency mixing, orthogonalizing and frequency multiplying a radio-frequency signal of a certain frequency band input by a frequency tracking module and outputs the signal.
Preferably, the frequency tracking module and the transceiver module are connected by a radio frequency cable, and the signal and power are provided by a micro rectangular connector, wherein the interface between the millimeter wave transceiver module and the outside of the imaging system comprises: 1 path of same-phase signal I, 1 path of orthogonal signal Q, 1 path of 100MHz synchronous clock signal and a control and communication interface; the interface inside the millimeter wave transceiver module, namely between the track and the transceiver component, comprises: 2 paths of 100MHz synchronous clock signals, 1 path of intermediate frequency input, 1 path of intermediate frequency output, 1 path of radio frequency input, 1 path of radio frequency output and 1 path of local oscillator input; the interface between the millimeter wave transceiver module and the interior of the millimeter wave transceiver front end comprises: 1 way millimeter wave transmission signal, 1 way millimeter wave receiving signal and control and power supply interface.
Compared with the prior art, the utility model, the beneficial effect who has is:
1. the improved millimeter wave transceiving front end adopts a new transceiver module, an antenna array, a two-stage switch network and a power supply module. Besides the improvement of performance indexes, the structure and the electrical connection relation of the system are simple and clear, the integration level of a product is effectively improved through the design concepts of module optimization, generalization and industrialization, and the system is easy to maintain and repair and has the advantages of stable and reliable performance, good consistency, high cost performance, easiness in large-scale production and the like.
2. The millimeter wave transceiving front end adopts 192 channel scales of transmitting and receiving respectively, adopts a mode of dividing 16 paths into 1 small-scale subarray module to carry out multichannel modular integration, adopts a module design scheme that 16 paths of subarray switch modules are used for receiving and transmitting once, improves the expansibility of a system and the interchangeability of modules, and has good signal interconnection, module independent performance test and module packaging technology inheritance inside the system.
3. By adopting a new switch network scheme, selecting and updating a millimeter wave switch chip, a driving chip, a structure and an assembly process, and adopting a receiving and transmitting integrated circuit and structural design, under the condition of meeting the requirement of normal working time sequence, the complexity and the installation and debugging difficulty of the system are greatly reduced, more concise layout and wiring are realized, and meanwhile, the related performance indexes are greatly improved. A metal grid is adopted for dividing the transmitting antenna array and the receiving antenna array, the isolation between transmitting and receiving is increased, and the arrangement of the transmitting and receiving antennas meets the requirement of a sampling law.
4. Adopt the transceiver module design scheme that track and receiving and dispatching subassembly are separated, the frequency synthesis module includes: the frequency source, the amplifier, the power divider, the demodulator, the DDS, the phase-locked loop, the filter and the frequency multiplication filtering part. The transceiver module consists of amplifier, mixer, quadrature device, filter and frequency multiplier parts. The high-frequency and low-frequency sub-modules are optimally designed, a new process is adopted to meet the technical requirements of broadband, frequency stabilization and phase stabilization, and the design of a small-sized, integrated, low-cost and low-power-consumption transceiver module is realized.
Drawings
Fig. 1 is a block diagram of the millimeter wave transceiver front end of the present invention;
fig. 2 is a schematic layout of a millimeter wave transceiver antenna array;
fig. 3 is a working schematic diagram of the millimeter wave transceiving front end of the present invention;
fig. 4 is a block diagram of the frequency synthesizer module of the present invention;
fig. 5 is a block diagram of the transceiver module of the present invention;
fig. 6 is a general schematic block diagram of the millimeter wave switch network of the present invention;
fig. 7 is a schematic block diagram of the SP12T switch unit of the present invention;
fig. 8 is a schematic block diagram of the SP16T transmitting switch unit of the present invention;
fig. 9 is a schematic block diagram of the SP16T receiving switch unit of the present invention;
fig. 10 shows the control sequence of the millimeter wave transceiver front end according to the present invention.
In the figure: the system comprises a 1-millimeter wave receiving and transmitting antenna array, a 2-millimeter wave receiving and transmitting switch network, a 3-millimeter wave receiving and transmitting module, a 4-secondary power supply module, a 11-transmitting antenna array, a 12-receiving antenna array, a 21-transmitting switch network, a 22-receiving and transmitting secondary switch network, a 211-transmitting primary switch network, a 212-receiving primary switch network and a 31-program control board of the receiving and transmitting module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the millimeter wave transceiver front end is composed of a millimeter wave transceiver antenna array 1, a millimeter wave transceiver switch network 2, a millimeter wave transceiver module 3, and a power module 4. The millimeter wave transceiving antenna array 1 is divided into a transmitting antenna array 11 and a receiving antenna array 12; the millimeter wave transceiving switch network 2 is divided into a transceiving primary switch network 21 and a transceiving secondary switch network 22, the transceiving primary switch network 21 is composed of a transmitting primary switch network 211 and a receiving primary switch network 212, and the transceiving secondary switch network 22 is composed of 1 double-pole sixteen-throw switch SP 16T.
As shown in fig. 2, the millimeter wave transmitting array is divided into a transmitting antenna array and a receiving antenna array, which are both pitch one-dimensional linear arrays with an array scale of 192 units, the transmitting units are sequentially T1, T2, \8230 \ 8230;, T192, and the receiving units are sequentially R1, R2, \\8230; \8230;, R192, and the transmitting units are sequentially staggered with two adjacent receiving units to form an isosceles triangle, and in addition, in order to increase the isolation between the transmitting and receiving antennas, a metal grid is used to divide the transmitting antenna array and the receiving antenna array. The array arrangement meets the requirement of a sampling law, and switches of transmitting and receiving channels are controlled by time sequence.
As shown in fig. 3, the power supply of the whole rf front-end subsystem is the power supply module 4 that performs DC-DC power conversion to obtain the required power supply type and power supply requirement. The power supply object comprises a transceiver module, 1 transmitting 12-to-1 switch network, 1 receiving 12-to-1 switch network, 12 receiving-transmitting integrated 16-to-1 switch networks and a program control board, and the transceiver module, the transmitting 12-to-1 switch network and the program control board are connected with the power supply object through stranded wires. The control instruction of the receiving and transmitting front-end subsystem is controlled by the imaging system through the micro rectangular connector, and the generation of the internal control signal of the receiving and transmitting front-end subsystem is realized by the transceiver module through the micro rectangular connector. The millimeter wave transceiving front end is in a transmitting state: the transceiver module 3 generates a radio frequency modulation continuous wave signal, the radio frequency modulation continuous wave signal enters a transmitting 12-to-1 switch network 211 through an amplitude-stabilizing phase-stabilizing coaxial cable, then enters a transmitting 16-to-1 switch network of a transmitting-receiving integrated secondary switch network 22 through an equal-length amplitude-stabilizing coaxial cable, and then a certain transmitting channel is opened through a control instruction and a time sequence of the transceiver module according to a specific time sequence through 12 program control boards and the switch network to be radiated by a transmitting antenna unit 11. In a receiving state: for receiving echo signals, the instruction and time sequence of the transceiver module control 12 program control boards 31 and the transceiving switch network 2 to sequentially turn on two adjacent receiving antenna units of the transmitting antenna unit, the echo signals are received by the receiving antenna units, gated and amplified with low noise through a receiving 16-to-1 switch network of the transceiving integrated secondary switch network 22, enter the receiving 12-to-1 switch network 212 through equal-length, stable-amplitude and stable-phase coaxial cables respectively, enter the radio-frequency input end of the transceiver module 3 through the stable-amplitude and stable-phase coaxial cables, and are amplified, down-converted and the like inside the transceiver module to output two paths of I and Q intermediate-frequency signals.
As shown in fig. 4 and 5, in the present scheme, the track module and the transceiver module are separately designed, and the module design is further refined by cable connection. The frequency synthesis module consists of a frequency source, an amplifier, a power divider, a demodulator, a DDS, a phase-locked loop, a filter and a frequency multiplication filtering part. The transceiver module consists of an amplifier, a mixer, a quadrature device, a filter and a frequency multiplier. The frequency synthesis module mainly generates local oscillator signals required by the transceiver module; the transceiver is mainly used for generating signals required by each function of the imaging equipment, and comprises the following steps of transmitting an excitation signal and a synchronous signal, receiving an echo signal, and carrying out amplification, frequency mixing, filtering and other processing on the signals, wherein the working principle of the frequency synthesis/intermediate frequency receiver module is as follows: 73, dividing the power into three paths, wherein one path of the power is amplified, filtered, then output two paths of orthogonal signals through 77, and output two paths of orthogonal signals of 53 and 54 through 74 and 75, and the orthogonal signals are used as local oscillation signals for down-conversion of the intermediate frequency receiver; the second path is respectively used as a reference signal 52 of a collector and a local oscillation signal 51 of a transmitting link after attenuation and amplification power division; the third path is used as a reference signal for 78 after being attenuated and amplified, the signal output by 78 is used as a clock for 80, 80 outputs a sweep frequency signal under the control of the FPGA, and the signal is filtered, amplified and quadrupled to output a local oscillation signal 55. The array module reset signal, the linear frequency modulation source control signal and the array module control signal are externally input to the FPGA of the frequency synthesizer. According to the fixed time sequence, 192 control signals of the transceiving switches are generated. Because 192 receive/send control signals all adopt parallel port control. The transceiver module is mainly composed of three major parts: the high-frequency local oscillator part, the high-frequency transmitting part and the high-frequency receiving part; the high frequency local oscillator section is mainly to quadruple frequency the local oscillator signal 55 provided by the frequency synthesizer/intermediate frequency receiver module to a radio frequency signal through 82, and to provide the high frequency local oscillator signal to the high frequency receiving and transmitting section 86 through 82, respectively. The high frequency transmitting part mixes and amplifies the output signal 51 provided by the frequency synthesizer/intermediate frequency receiver module with a high frequency local oscillator signal, and finally outputs a radio frequency signal. The high frequency receive section performs low noise amplification of the weak echo signal 57 and mixes it with another high frequency local oscillator signal at 84 to an intermediate frequency signal, which is further filtered and amplified at 87.
As shown in fig. 6-9, the switch network of the transceiver is compatible with the millimeter wave circuit and the digitally controlled switch circuit. The millimeter wave circuit mainly comprises a switch selection circuit and a low-noise amplification circuit, and the two-digital control switch circuit mainly performs differential-to-single-ended interface conversion, logic decoding and PIN driving generation on a logic control signal of the transceiver module. The transmitting and receiving integrated switch network transmits the transmitting excitation signal to 192 antenna units through switch switching to radiate out, and simultaneously transmits the echo signals received by the 192 receiving antenna units to a transceiver module through switch gating according to a certain time sequence to carry out lower frequency processing and analysis. The radio frequency switch network circuit is divided into a transmitting switch network circuit and a receiving switch network circuit which respectively correspond to the transmitting channel and the receiving channel of the antenna array. The 192-to-1 function is realized by two stages of switches in principle, a primary switch network circuit is shown in fig. 7 and consists of a receiving 12-to-1 switch network circuit and a transmitting 12-to-1 switch network circuit, a secondary switch network circuit is shown in fig. 8 and 9, a receiving-transmitting integrated 16-to-1 switch network consists of a transmitting SP16T and a receiving SP16T, and a front-end integral switch network part consists of a group of primary switch network modules and twelve secondary switch network modules. The single-pole twelve-throw switch is formed by cascading 4 SP4T switches and 1 SP3T switch into an integral functional module. The 12-channel fast gating switching function is used for realizing the input of millimeter wave signals; the double-pole-sixteen-throw switch consists of 1 transmitting single-pole-sixteen-throw switch and 1 receiving single-pole-sixteen-throw switch. The SP16T-Tx module and the SP16T-Rx module are structurally integrated, and share the control circuit part and the control and power supply interface. The SP16T-Tx module is used for realizing the functions of power amplification of the fed millimeter wave excitation signal, quick gating switching of a 16-channel and the like; the SP16T-Rx module is used for realizing the functions of the 16-channel fast gating switching, low-noise amplification and the like of the received millimeter wave echo signals;
as shown in fig. 10, the number of the millimeter wave transceiving antenna arrays 1 corresponds to the number of the channels of the millimeter wave transceiving switch network 2, and the logical relationship for implementing the transceiving electronic switching is as follows: controlling a transmitting switch network 21 of the millimeter wave transceiving switch network 2 to conduct a 1 st transmitting unit antenna T1 in a transmitting antenna array 11 of the millimeter wave transceiving antenna array 1 through a TLL control signal, and transmitting a millimeter wave signal to a detected object; meanwhile, the TLL control signal controls the receiving switch network 22 of the millimeter wave transceiving switch network 2 to sequentially turn on the 1 st receiving element antenna R1 and the 2 nd receiving element antenna R2 in the receiving antenna array 12 of the millimeter wave transceiving antenna array 1, thereby realizing the functions of single antenna transmission and two-transmitter-two-receiver reception in one transmission period, and so on to complete the sequential switching of all channels.
The above description has been made in detail only for the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art, and all such changes are intended to be encompassed by the present invention.
Claims (10)
1. The utility model provides an active human safety inspection imaging system's of improved generation millimeter wave receiving and dispatching front end which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the optimized design of a millimeter wave transceiving antenna array (1) of a Ka waveband is characterized in that a transceiving antenna array isolation design is adopted, the spacing between transceiving antenna arrays is 25mm, a metal grid is divided and isolated, the millimeter wave transceiving antenna array (1) comprises a transmitting antenna array (11) and a receiving antenna array (12), the transmitting antenna array (11) at least comprises a transmitting antenna sub-array formed by 16 transmitting units, and the receiving antenna array (12) at least comprises a transmitting antenna sub-array formed by 16 receiving units;
the primary switch adopts a transceiving split scheme, the secondary switch adopts a transceiving integrated scheme, and the transceiving integrated switch network is compatible with a millimeter wave circuit and a digital control switch circuit and comprises 12 paths of primary switch channels and 16 paths of secondary switches;
the Ka-band millimeter wave transceiver module (3) adopts a design scheme that a frequency tracking module and a transceiver component are separately arranged, high frequency and low frequency are separately designed, and control and radio frequency are independently designed;
the power supply module (4) is used for directly outputting the power supply requirement required by the relevant module;
the millimeter wave transceiving switch network (2) is used for connecting the millimeter wave transceiving antenna array (1) and the millimeter wave transceiver module (3).
2. The improved millimeter wave transceiving front end of the active human body security check imaging system according to claim 1, characterized in that: the transmitting antenna array (11) comprises a one-dimensional uniform linear array consisting of 12 transmitting antenna sub-arrays; the receiving antenna array (12) comprises a one-dimensional uniform linear array consisting of 12 receiving antenna sub-arrays.
3. The improved generation active human body security check imaging system's millimeter wave receiving and dispatching front end of claim 1, characterized in that: the millimeter wave transceiving switch network (2) is divided into a transmitting switch network (21) and a receiving switch network (22), and the transmitting switch network (21) and the receiving switch network (22) are both composed of 2-level switch networks.
4. The improved millimeter wave transceiving front end of the active human body security inspection imaging system according to claim 3, wherein: the transmitting switch network (21) consists of a transmitting primary switch network (211) with 1 single-pole twelve-throw switch SP12T and a transmitting secondary switch network (212) formed by cascading 12 double-pole 16-throw switches SP16T-Tx, and the transmitting primary switch network (211) and the transmitting secondary switch network (212) are connected through a millimeter wave coaxial cable; the receiving switch network (22) is composed of a receiving primary switch network (221) with 1 single-pole twelve-throw switch SP12T and a receiving secondary switch network (222) with 12 single-pole twelve-throw switches SP16T-Rx cascade connection, and the receiving primary switch network (221) and the receiving secondary switch network (222) are connected through a millimeter wave coaxial cable.
5. The improved generation active human body security check imaging system's millimeter wave receiving and dispatching front end of claim 1, characterized in that: the millimeter wave transceiver module (3) is connected with the transmitting antenna array (11) through the transmitting switch network (21), and the receiving antenna array (12) sequentially receives echo signals backscattered by a target and enters the millimeter wave transceiver module (3) after being switched by the receiving switch network (22).
6. The improved generation active human body security check imaging system's millimeter wave receiving and dispatching front end of claim 1, characterized in that: the power module (4) has input + 12V, output + 5V-5V multi-path, and supplies to the millimeter wave transceiver switch network (2) and the millimeter wave transceiver module (3).
7. The improved generation active human body security check imaging system's millimeter wave receiving and dispatching front end of claim 1, characterized in that: the distance between the transmitting units is 1 time of millimeter wave wavelength, and the distance between the receiving units is 1 time of millimeter wave wavelength.
8. The improved millimeter wave transceiving front end of the active human body security check imaging system according to claim 1, characterized in that: the transmitting antenna array and the receiving antenna array are parallel to each other, the distance between the transmitting antenna array and the receiving antenna array is about 2.5 times of millimeter wave wavelength, and the transmitting antenna array and the receiving antenna array are staggered by 0.5 times of millimeter wave wavelength along the array arrangement direction.
9. The improved millimeter wave transceiving front end of the active human body security check imaging system according to claim 1, characterized in that: the millimeter wave transceiver module (3) consists of a frequency tracking module and a transceiver module,
the frequency synthesis module consists of a frequency source, an amplifier, a power divider, a demodulator, a DDS, a phase-locked loop, a filter and a frequency multiplication filtering part, the DDS and the phase-locked loop are triggered and controlled through an external control signal to generate required frequency band frequency, the frequency band frequency is divided into a plurality of corresponding paths of signals through the power divider, and then different output signals are subjected to amplification filtering demodulation frequency multiplication and output to a transceiving component or are directly output;
the transceiver component consists of an amplifier, a mixer, an orthogonalizer, a filter and a frequency multiplier, and obtains a designed index signal by amplifying, filtering, mixing, orthogonalizing and multiplying a radio frequency signal of a certain frequency band input by a frequency tracking module and outputs the signal.
10. The improved active human body security inspection imaging system millimeter wave transceiving front end of claim 9, characterized in that: the frequency trace module and the receiving and transmitting assembly are connected through a radio frequency cable, and signals and power are provided through a micro rectangular connector, wherein an interface between the millimeter wave transceiver module (3) and the outside of the imaging system comprises: 1 path of same-phase signal I, 1 path of orthogonal signal Q, 1 path of 100MHz synchronous clock signal, and a control and communication interface; the interface inside the millimeter wave transceiver module (3), namely between the track and the transceiver component, comprises: 2 paths of 100MHz synchronous clock signals, 1 path of intermediate frequency input, 1 path of intermediate frequency output, 1 path of radio frequency input, 1 path of radio frequency output and 1 path of local oscillator input; the interface between the millimeter wave transceiver module (3) and the interior of the millimeter wave transceiver front end comprises: 1-path millimeter wave transmitting signal, 1-path millimeter wave receiving signal and a control and power supply interface.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116979988A (en) * | 2023-09-21 | 2023-10-31 | 电子科技大学 | Miniaturized highly integrated millimeter wave front end assembly module |
| CN117459353A (en) * | 2023-12-22 | 2024-01-26 | 德氪微电子(深圳)有限公司 | Digital isolator, application circuit thereof and isolated communication method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116979988A (en) * | 2023-09-21 | 2023-10-31 | 电子科技大学 | Miniaturized highly integrated millimeter wave front end assembly module |
| CN116979988B (en) * | 2023-09-21 | 2023-12-22 | 电子科技大学 | Miniaturized highly integrated millimeter wave front end assembly module |
| CN117459353A (en) * | 2023-12-22 | 2024-01-26 | 德氪微电子(深圳)有限公司 | Digital isolator, application circuit thereof and isolated communication method |
| CN117459353B (en) * | 2023-12-22 | 2024-03-29 | 德氪微电子(深圳)有限公司 | Digital isolator, application circuit thereof and isolated communication method |
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