阅读说明：本技术 一种基于多功能芯片的小型化毫米波太赫兹系统 (Miniaturized millimeter wave terahertz system based on multifunctional chip ) 是由 孙泽月 王健 王晓鹏 张力维 侯振华 陈林 姚武生 涂昊 于 2020-11-11 设计创作，主要内容包括：本发明公开了一种基于多功能芯片的小型化毫米波太赫兹系统,属于毫米波/太赫兹成像技术领域,包括频率源、分配网络、多功能芯片、天线阵列、控制模块、电源模块,所述频率源、所述分配网络、所述多功能芯片、所述天线阵列依次连接,所述控制模块分别与所述频率源、所述分配网络、所述多功能芯片、所述天线阵列连接。本发明将倍频、放大、混频、开关等两种或多种功能电路集于多功能芯片一身,结合相应规模的分配网络、天线阵列以及控制和电源,大大减少系统互连和系统体积,减小系统设计难度和成本,提高性能指标的一致性,使得有限空间内复杂的多通道毫米波太赫兹系统工程化成为可能。(The invention discloses a miniaturized millimeter wave terahertz system based on a multifunctional chip, which belongs to the technical field of millimeter wave/terahertz imaging and comprises a frequency source, a distribution network, the multifunctional chip, an antenna array, a control module and a power supply module, wherein the frequency source, the distribution network, the multifunctional chip and the antenna array are sequentially connected, and the control module is respectively connected with the frequency source, the distribution network, the multifunctional chip and the antenna array. The invention integrates two or more functional circuits such as frequency doubling, amplification, frequency mixing, switching and the like into a whole, and combines a distribution network, an antenna array, control and a power supply with corresponding scales, thereby greatly reducing the system interconnection and the system volume, reducing the system design difficulty and cost, improving the consistency of performance indexes and enabling the engineering of a complex multichannel millimeter wave terahertz system in a limited space to be possible.)

1. The utility model provides a miniaturized millimeter wave terahertz system based on multi-functional chip which characterized in that: the frequency source, the distribution network, the multifunctional chip and the antenna array are sequentially connected, the control module is respectively connected with the frequency source, the distribution network, the multifunctional chip and the antenna array, and the power module is respectively connected with the frequency source, the distribution network, the multifunctional chip and the antenna array.

2. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 1, wherein: the millimeter wave terahertz system further comprises a high-frequency printed board, and the high-frequency printed board is used as a carrier of any one or more of the frequency source, the distribution network, the multifunctional chip, the antenna array and the control module.

3. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 2, wherein: the frequency source is a frequency synthesizer of various systems and is used for generating one or more signal forms of step frequency continuous wave, linear frequency modulation continuous wave, pulse and triangular wave, the signal starting time and the initial phase are controlled by the control module, and the frequency source can be selectively split into a plurality of parts according to the implementation form of the system.

4. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 3, wherein: the distribution network includes a transmission channel distribution network and a reception channel distribution network, and the distribution network is configured to distribute the signals generated by the frequency sources to the respective multifunction chips in accordance with the scale of the system.

5. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 4, wherein: the implementation mode of the distribution network comprises one or more of the following three types: firstly, signal distribution is realized through a multi-channel power distribution network; secondly, signal distribution is realized through a switch array; and thirdly, the multi-channel power distribution network and the switch array are mixed to realize signal distribution.

6. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 5, wherein: the multifunctional chip comprises a multifunctional transmitting chip, a multifunctional receiving chip and a multifunctional transceiving chip, wherein the multifunctional transmitting chip is used for converting the frequency of a signal generated by the frequency source to the transmitting frequency of a millimeter wave terahertz system, the multifunctional receiving chip is used for converting the frequency of the received signal to an intermediate frequency, and the multifunctional transceiving chip integrates the functions of the multifunctional transmitting chip and the multifunctional receiving chip.

7. The miniaturized millimeter wave terahertz system based on the multifunctional chip as claimed in claim 6, wherein: the multifunctional transmitting chip, the multifunctional receiving chip and the multifunctional transceiving chip respectively comprise any combination of two or more than two of an amplifying module, a frequency conversion module, a switch module and a detection module.

8. The multifunctional chip-based miniaturized millimeter wave terahertz system according to claim 7, characterized in that: the antenna array comprises a transmitting and receiving antenna array used for realizing the transmitting and receiving functions of millimeter wave terahertz signals, and the transmitting and receiving antenna array is in a one-dimensional array or a multi-dimensional array.

9. The multifunctional chip-based miniaturized millimeter wave terahertz system according to claim 8, characterized in that: the control module provides accurate control time sequence or carries out beam scheduling for the frequency source, the distribution network, the multifunctional chip and the antenna array according to system functions.

10. The multifunctional chip-based miniaturized millimeter wave terahertz system according to claim 9, characterized in that: the power supply form of the power supply module is one or a combination of more of AC-DC, DC-DC and LDO.

Technical Field

The invention relates to the technical field of millimeter wave/terahertz imaging, in particular to a miniaturized millimeter wave terahertz system based on a multifunctional chip.

Background

In recent years, terrorist violent attack incidents in public places, such as the us boston marathon explosion case in 2013, the suicidal explosion attack at morsco mujiedover airport in 2011, the london subway and bus catenular explosion case in 2005, and the like, frequently occur, and cause serious casualties and serious property loss. Therefore, security inspection in public places with dense personnel, such as airports, customs, railway stations, subway stations and the like, is increasingly receiving wide attention from countries around the world. However, with the development of scientific technology, the technical content and the variety of dangerous goods carried by criminals are higher and higher, and the dangerous goods may be liquid, plastic products, ceramic products, powder, bulk explosives and the like, which puts higher requirements on the accuracy, the real-time performance and the intelligence of the safety inspection system.

With the development of science and technology, especially the wide application of millimeter wave terahertz technology, millimeter wave terahertz imaging equipment has become a mainstream human body security inspection means, and the application prospect is better and better. Compared with the traditional metal detector and X-ray imaging equipment, the millimeter wave terahertz security inspection imaging system can detect out non-metal dangerous goods such as plastics, liquid and ceramics, and meanwhile, as non-ionization equipment, the millimeter wave terahertz security inspection imaging system does not affect human health on the premise of moderate radiation power. The millimeter wave terahertz human body security inspection imaging system is divided into an active type and a passive type, passive imaging is carried out by directly utilizing the self thermal radiation of a human body in the passive type, and the detection of carrying hidden objects on the surface of the human body is realized. The active millimeter wave/terahertz radiation with micro power is adopted to irradiate a human body and detect scattering echoes of the human body, then a detection area image is reconstructed through a specific imaging algorithm, the influence of environmental conditions is small, and the signal-to-noise ratio is far higher than that of passive imaging, so that the active millimeter wave terahertz security inspection imaging system has irreplaceable advantages in the field of future high-accuracy human body security inspection.

However, with the continuous improvement of the used wave band, the wavelength of the millimeter wave terahertz wave band signal is smaller and smaller, especially the millimeter wave terahertz system adopts a multi-transmission multi-reception technology system, the number of the transmitting and receiving channels is large, and it has become very difficult to form the millimeter wave terahertz system by adopting discrete components in a limited space, and the analysis from consistency, design difficulty, interconnection process and installation and debugging difficulty brings unrealistic performance in engineering. Therefore, a miniaturized millimeter wave terahertz system based on a multifunctional chip is provided.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to solve the problem of difficult design of a millimeter wave terahertz waveband system caused by limited space, and provides a miniaturized millimeter wave terahertz system based on a multifunctional chip.

The invention solves the technical problems by the following technical scheme, and comprises a frequency source, a distribution network, a multifunctional chip, an antenna array, a high-frequency printed board, a control module and a power supply module. The frequency source is a bottom continuous wave system signal generating device (generating a bottom signal source) and provides a reference datum for the whole millimeter wave terahertz system, the distribution network distributes signals generated by the frequency source to each multifunctional chip according to the scale of the system, the multifunctional chip comprises a multifunctional transmitting chip, a multifunctional receiving chip and a multifunctional receiving and transmitting chip integrating receiving and transmitting functions, the multifunctional transmitting chip converts the frequency of the bottom signal source to the transmitting frequency of the millimeter wave terahertz system or the terahertz system, the multifunctional receiving chip converts the frequency of the received signals to intermediate frequency, the multifunctional receiving and transmitting chip integrating receiving and transmitting functions further integrates the functions of the multifunctional transmitting chip and the multifunctional receiving chip, the antenna array realizes the transmitting and receiving functions of the millimeter wave terahertz signals, the high-frequency printed board is a carrier of one or more functional modules such as the distribution network, the multifunctional chip, the antenna array and the control module, the control module provides control time sequence or carries out beam scheduling for a frequency source, a distribution network, a multifunctional chip, an antenna array and the like according to system functions, and the power supply module supplies power to the whole millimeter wave terahertz system.

Furthermore, the frequency source is a frequency synthesizer with various systems, and can generate one or more signal forms such as step frequency continuous wave, linear frequency modulation continuous wave, pulse, triangular wave and the like, the signal starting time and the initial phase are controlled by the control module, and the frequency source can be selectively split into a plurality of parts according to the implementation form of the system.

Furthermore, the distribution network distributes the signals generated by the frequency source to the multifunctional chips according to the scale of the system, and comprises a transmitting channel distribution network and a receiving channel distribution network, and the implementation mode of the distribution network comprises one or more of the following three modes: the signal distribution is realized through a multi-channel power distribution network, the signal distribution network is realized through a switch array, and the signal distribution is realized through the mixing of the multi-channel power distribution network and the switch array.

Furthermore, the multifunctional chip comprises a multifunctional transmitting chip, a multifunctional receiving chip and a multifunctional transceiving chip integrating transceiving functions. The multifunctional transmitting chip converts the frequency of a bottom layer signal source (a signal generated by the frequency source) into the transmitting frequency of a millimeter wave or terahertz system, internal functional modules of the multifunctional transmitting chip include (but are not limited to) amplification, frequency conversion (frequency multiplication, frequency mixing and frequency division), a switch (or power division), detection, an antenna and the like, and the multifunctional transmitting chip can be called by randomly combining two or more functions. The multifunctional receiving chip converts the received signal into an intermediate frequency, and its internal functional modules include (but are not limited to) amplification, frequency conversion (frequency multiplication, frequency mixing, frequency division), switch (or power division), detection, antenna, etc., and any combination of two or more of these functions can be called as the multifunctional receiving chip. The multifunctional transceiving chip integrated with the transceiving function is further integrated with the functions of the multifunctional transmitting chip and the multifunctional receiving chip, and similarly, the multifunctional transceiving chip can be called as a multifunctional transceiving chip by randomly combining two or more functions. The number of channels of the multifunctional chip may be one or more, and each channel can be independently controlled according to the system requirements.

Furthermore, the antenna array realizes the functions of transmitting and receiving millimeter wave terahertz signals, the form of the transmitting and receiving antenna array can be a one-dimensional array or a multidimensional array, the one-dimensional array can be a linear array, a polygonal array or an arc array, etc., the multidimensional array can be a full array or a sparse array, the number of the transmitting and receiving antenna units can be equal or unequal, the polarization mode of the antenna units can be linear polarization, circular polarization or elliptical polarization, and the structural form of the antenna units can be (but is not limited to) horn antennas, printed board antennas or on-chip antennas.

Furthermore, the control module provides a precise control time sequence or performs beam scheduling for a frequency source, a distribution network, a multifunctional chip, an antenna array and the like according to system functions, and a hardware platform is a time sequence control or beam scheduling board card which is manufactured based on one or a combination of several of an FPGA, a DSP, a CPLD and an MCU and is combined with a supporting circuit, and can be independently formed into a functional module or integrated into a high-frequency printed board together with the distribution network, the multifunctional chip, the antenna and the like.

Furthermore, the power supply module supplies power to the whole millimeter wave terahertz system, and the power supply form can be one or a combination of AC-DC, DC-DC and LDO.

Compared with the prior art, the invention has the following advantages: according to the miniaturized millimeter wave terahertz system based on the multifunctional chip, two or more functional circuits such as frequency doubling, amplification, frequency mixing and switching are integrated into the multifunctional chip, and a distribution network, an antenna array and a control and power supply of corresponding scales are combined, so that system interconnection and system size are greatly reduced, system design difficulty and cost are reduced, consistency of performance indexes is improved, engineering of the complex multichannel millimeter wave terahertz system in a limited space is possible, and the miniaturized millimeter wave terahertz system based on the multifunctional chip is worthy of being popularized and used.

Drawings

FIG. 1 is a schematic diagram of a millimeter wave terahertz system in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a distribution network in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a multifunction chip in an embodiment of the invention;

fig. 4 is a schematic diagram of an antenna array in an embodiment of the present invention.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

As shown in fig. 1, the millimeter wave terahertz system of the present embodiment includes a frequency source 100, a distribution network 200, a multifunctional chip 300, an antenna array 400, a high-frequency printed board 500, a control module 600, and a power supply module 700; the frequency source 100 is a bottom multi-system signal generating device, provides a required transmitting signal and a required local oscillator signal for receiving for the multifunctional chip 300, and provides a reference for the whole millimeter wave terahertz system; distribution network 200 distributes the signals generated by frequency source 100 on a system scale to meet the input signal requirements of the plurality of multifunction chips 300. The antenna array 400 transmits an output signal of the multifunctional chip 300 to a free space, and simultaneously receives an echo signal and then inputs the echo signal to the multifunctional chip 300 for down-conversion; the high-frequency printed board 500 provides a carrier for one or more functional modules such as the distribution network 200, the multifunctional chip 300, the antenna array 400 and the like, so that the system integration level is improved, and the miniaturization requirement is met; the control module 600 provides a clock sequence required by the frequency source 100, the distribution network 200, the multifunctional chip 300 and the antenna array 400, maintains time synchronization among the modules, and provides a control signal according to a system working mode; the power supply module 700 provides power supply for normal operation of the whole millimeter wave terahertz system.

In this embodiment, the frequency source 100 is a continuous wave frequency synthesizer capable of generating a step frequency continuous wave or a chirp continuous wave signal, in this embodiment, the DDS is used as a core chip to generate a radio frequency step frequency continuous wave signal or a chirp continuous wave, and a series of frequency conversion, filtering, and amplification are performed to obtain a step frequency continuous wave signal or a chirp continuous wave signal of a desired frequency band, the signal start time and the initial phase are controlled by the control module 600, and the frequency source 100 is made into an integral case according to the implementation form of the system.

In this embodiment, the distribution network 200 distributes the signals generated by the frequency source 100 to each multifunctional chip 300 according to the scale of the system, and includes a transmission channel distribution network and a reception channel distribution network, the distribution network 200 uses a multi-channel power distribution network 201 to implement signal distribution, or uses a signal distribution network implemented by a switch array 202, or uses a multi-channel power distribution network and a switch array 203 to implement signal distribution, and one or more distribution forms may be used in one system.

In the present embodiment, the multifunctional chip 300 includes a multifunctional transmitting chip 301, a multifunctional receiving chip 302, and a multifunctional transceiving chip 303 integrated with transceiving functions. The multifunctional transmitting chip 301 converts the frequency of the signal generated by the frequency source 100 to the transmitting frequency of the millimeter wave terahertz system, the internal functional modules of the multifunctional transmitting chip 301 include a driving amplifier, a frequency multiplier, a filter, a one-to-four switch network composed of three one-to-two switches, and the like, and the number of the channels is four. The multifunctional receiving chip 302 converts the frequency of the received signal to an intermediate frequency, and its internal functional modules include a driving amplifier, four low noise amplifiers, four intermediate frequency amplifiers, a frequency multiplier, five filters, four mixers, a one-to-four switch network composed of three one-to-two switches, and the number of channels is four. The multifunctional transceiving chip 303 with integrated transceiving function further integrates the functions of the multifunctional transmitting chip 301 and the multifunctional receiving chip 302, the number of transmitting and receiving channels is four respectively, and each channel of the multifunctional chip 300 can be controlled independently. One or more of the multifunction chips 300 may be used depending on system functional requirements.

In this embodiment, the antenna array 400 realizes the transmitting and receiving functions of millimeter wave terahertz signals, the transmitting and receiving antenna units adopt receiving and transmitting split circular polarization or linear polarization printed board antennas, the array form is divided into two types, namely a one-dimensional linear array 401 and a two-dimensional sparse array 402, the number of the transmitting antenna units and the number of the receiving antenna units are equal, and it should be noted that: the linear array, the polygonal array or the arc array should belong to the one-dimensional array 401. In order to further improve the integration level of the system, the antenna unit of the embodiment adopts a printed board antenna or an on-chip antenna.

In this embodiment, the high-frequency printed board 500 is a carrier for a plurality of functional modules, such as the multifunctional chip 300, the distribution network 200, and the antenna array 400, and is made of the material of rocky 4350B, and has a total number of layers of 8, and is formed by a surface immersion gold process.

In this embodiment, the control module 600 uses the FPGA platform to make a timing control and beam scheduling board card, and generates a series of pulse signals, so as to provide a precise control timing sequence or perform beam scheduling for the multifunctional chip 300, the antenna array 400, the distribution network 200, and the like according to system functions.

In the embodiment, the power module 700 supplies power to the whole millimeter wave terahertz system, and the power form is combined by three forms of AC-DC, DC-DC and LDO.

In summary, in the miniaturized millimeter wave terahertz system based on the multifunctional chip, two or more functional circuits such as frequency doubling, amplification, frequency mixing, switching and the like are integrated into the multifunctional chip, and a distribution network, an antenna array, control and a power supply with corresponding scales are combined, so that system interconnection and system size are greatly reduced, system design difficulty and cost are reduced, consistency of performance indexes is improved, engineering of the complex multichannel millimeter wave terahertz system in a limited space is possible, and the miniaturized millimeter wave terahertz system based on the multifunctional chip is worthy of popularization and use.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.