阅读说明：本技术 一种有源毫米波太赫兹阵列 (Active millimeter wave terahertz array ) 是由 王健 孙泽月 张力维 王晓鹏 侯振华 陈林 姚武生 高炳西 于 2020-11-11 设计创作，主要内容包括：本发明公开了一种有源毫米波太赫兹阵列,属于毫米波太赫兹技术领域,包括发射有源阵列和接收有源阵列、中频网络和控制系统,所述收发有源阵列均包括收发馈电网络、收发多通道多功能芯片和收发天线阵列,所述收发馈电网络、所述收发多通道多功能芯片、所述收发天线阵列依次连接。本发明相比于常见的开关矩阵,使用频段范围可以更高,可以实现高度集成化、小型化和产品化；在频段达到高频段时,可以将天线阵列和多通道多功能芯片集成在一起,进一步减小收发阵列的体积,可以在安检、医疗、雷达等各种领域内实现手持式系统,值得被推广使用。(The invention discloses an active millimeter wave terahertz array, which belongs to the technical field of millimeter wave terahertz and comprises a transmitting active array, a receiving active array, an intermediate frequency network and a control system, wherein the transmitting and receiving active array comprises a transmitting and receiving feed network, a transmitting and receiving multi-channel multifunctional chip and a transmitting and receiving antenna array, and the transmitting and receiving feed network, the transmitting and receiving multi-channel multifunctional chip and the transmitting and receiving antenna array are sequentially connected. Compared with a common switch matrix, the invention has the advantages that the range of the use frequency band can be higher, and high integration, miniaturization and productization can be realized; when the frequency band reaches a high frequency band, the antenna array and the multi-channel multifunctional chip can be integrated together, the size of the receiving and transmitting array is further reduced, a handheld system can be realized in various fields such as security inspection, medical treatment, radar and the like, and the antenna array is worthy of popularization and application.)

1. An active millimeter wave terahertz array is characterized in that: the receiving multi-channel multifunctional chip comprises a receiving feed network, a receiving multi-channel multifunctional chip and a receiving antenna array, wherein the receiving feed network, the receiving multi-channel multifunctional chip and the receiving antenna array are sequentially connected, the intermediate frequency network is a network in which an intermediate frequency signal after the receiving multi-channel multifunctional chip is mixed is connected to a signal processing board, and the control system is respectively connected with control interfaces of the transmitting multi-channel multifunctional chip, the receiving multi-channel multifunctional chip and the intermediate frequency network through specific interfaces, and controlling the receiving and transmitting multi-channel multifunctional chip and the intermediate frequency network to switch channels according to a certain time sequence, wherein the working frequency band of the active millimeter wave terahertz array is from millimeter wave to terahertz.

2. The active millimeter wave terahertz array of claim 1, wherein: the transmitting feed network provides radio-frequency signals for the transmitting multi-channel multifunctional chips in any one or a mixed form of a multi-level power division network and a multi-level switch matrix.

3. The active millimeter wave terahertz array of claim 2, wherein: the transmitting multi-channel multifunctional chip comprises a first channel switching module and a plurality of first frequency converters, wherein one ends of the first frequency converters are respectively connected with all channels of the first channel switching module, the other ends of the first frequency converters are respectively connected with all transmitting antennas in a transmitting antenna array, the first channel switching module is connected with an output port of the transmitting feed network and used for receiving radio frequency signals of the transmitting feed network, and the number of the output channels of the transmitting multi-channel multifunctional chip is more than or equal to two.

4. The active millimeter wave terahertz array of claim 3, wherein: the antenna units of the transmitting antenna array and the receiving antenna array are any one or a mixture of a planar antenna, a horn antenna, a helical antenna, a packaged antenna and an on-chip antenna, and the transmitting antenna array and the receiving antenna array are any one of a one-dimensional linear array, a two-dimensional planar array and a multi-dimensional array.

5. The active millimeter wave terahertz array of claim 4, wherein: the receiving feed network provides local oscillation signals for the receiving multi-channel multifunctional chips in a form of any one or combination of a multi-level power distribution network and a multi-level switch matrix.

6. The active millimeter wave terahertz array of claim 5, wherein: the receiving multi-channel multi-function chip comprises a second channel switching module, a plurality of mixers and a plurality of second frequency converters, wherein one end of each second frequency converter is connected with each channel of the second channel switching module, the other end of each second frequency converter is connected with each mixer, and the number of input channels of the receiving multi-channel multi-function chip is more than or equal to two.

7. The active millimeter wave terahertz array of claim 6, wherein: the intermediate frequency network comprises two implementation modes, wherein all intermediate frequency signals are directly connected with an input interface of the signal processing board, and are connected with an input port of the signal processing board in a form of combining the power division network and the switch matrix.

8. The active millimeter wave terahertz array of claim 7, wherein: the control system comprises a voltage conversion module, and the voltage conversion module is used for converting direct current or alternating current voltage provided by the outside into working voltage required by the multi-channel multifunctional chip.

9. The active millimeter wave terahertz array of claim 8, wherein: the control system further comprises a storage module, wherein a time sequence truth table of the active millimeter wave terahertz transceiving array is stored in the storage module, and the control signal levels of the receiving and transmitting multifunctional chip and the intermediate frequency network are controlled to output high and low levels according to the truth table through an external starting trigger signal, so that time sequence control is realized.

10. The active millimeter wave terahertz array of claim 9, wherein: the beam scanning function of the active millimeter wave transceiving array adjusts the phase of a phase shifter and the amplitude of an attenuator arranged in the receiving and transmitting multifunctional chip through the control system, and adjusts the synthesis weight coefficients of different antenna units so as to realize the automatic scanning of the beam direction.

Technical Field

The invention relates to the technical field of millimeter wave terahertz, in particular to an active millimeter wave terahertz array.

Background

With the development of science and technology, millimeter wave frequency bands are receiving more and more attention. The millimeter wave terahertz is an electromagnetic wave with the frequency from 30GHz to 300THz and is positioned in the overlapping frequency range of microwave and far infrared wave, so the millimeter wave has the advantages of two wave spectrums,

due to the advantages of wide absolute bandwidth, short wavelength, special atmospheric propagation characteristic and the like, the method has great potential in systems such as communication and radar. The millimeter wave is permeable to clothes, so that the millimeter wave security inspection instrument becomes a popular industry in China in recent years. The millimeter wave safety inspection instrument is an efficient and civilized safety inspection mode for future human body safety inspection, and can quickly inspect whether a human body carries forbidden articles such as non-metal cutters, bulk explosives and the like.

The common millimeter wave security check instrument in the market at present is divided into a passive type and an active type, the passive type security check instrument mainly receives electromagnetic waves radiated by a human body to detect the human body, and the electromagnetic waves radiated by the human body have weak energy and are greatly influenced by the environment. The active security check instrument mainly works in the low-frequency band part of millimeter waves, the channel switching of the receiving and transmitting array is realized in a mode of a switch matrix, but the system of the receiving and transmitting array in the high-frequency band millimeter wave security check instrument is large in size, high in cost, multiple in internal connection lines and not easy to integrate and commercialize. Therefore, an active millimeter wave terahertz array is proposed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to solve the system that exists in receiving and dispatching array in high-band millimeter wave security check appearance bulky, with high costs, the interconnector is many, is difficult for integration and productization scheduling problem, provides an active millimeter wave terahertz array.

The invention solves the technical problems by the following technical scheme, and comprises a transmitting active array, a receiving active array, an intermediate frequency network and a control system, wherein the transmitting active array comprises a transmitting feed network, a transmitting multi-channel multifunctional chip and a transmitting antenna array, the transmitting feed network, the transmitting multi-channel multifunctional chip and the transmitting antenna array are sequentially connected, the receiving active array comprises a receiving feed network, a receiving multi-channel multifunctional chip and a receiving antenna array, the receiving feed network, the receiving multi-channel multifunctional chip and the receiving antenna array are sequentially connected, the intermediate frequency network is a network in which an intermediate frequency signal after the frequency mixing of the receiving multi-channel multifunctional chip is connected to a signal processing board, and the control system is respectively connected with the transmitting multi-channel multifunctional chip, the intermediate frequency network and the signal processing board through specific interfaces, The receiving multi-channel multifunctional chip is connected with the control interface of the intermediate frequency network, the receiving multi-channel multifunctional chip and the intermediate frequency network are controlled to switch channels according to a certain time sequence, and the working frequency band of the active millimeter wave terahertz array is from millimeter waves to terahertz.

Furthermore, the transmitting active array comprises a transmitting feed network, M1(M1 is more than or equal to 2) transmitting multi-channel multifunctional chips and a transmitting antenna array.

Furthermore, the transmitting feed network can adopt a multi-stage power division network, a multi-stage switch matrix or a mixed form of the two to provide radio-frequency signals for the transmitting multi-channel multifunctional chips.

Furthermore, the transmitting multi-channel multifunctional chip comprises two or more than two functional components such as a frequency converter, a power amplifier, channel switching, a phase shifter, an attenuator and the like, and the number of output channels N1 of the transmitting multi-channel multifunctional chip is more than or equal to 2.

Furthermore, the antenna units of the transmitting antenna array are in the form of a planar antenna, a horn antenna, a helical antenna, or the like, or a packaged antenna, an on-chip antenna, or the like, and the transmitting antenna array may be a one-dimensional linear array, a two-dimensional planar array, a multi-dimensional array, or the like.

Furthermore, the receiving active array comprises a receiving feed network, M2(M2 is more than or equal to 2) receiving multi-channel multifunctional chips and a receiving antenna array.

Furthermore, the receiving feed network may adopt a multi-stage power division network, a multi-stage switch matrix or a combination of the two to provide local oscillation signals for the plurality of receiving multi-channel multifunctional chips.

Furthermore, the receiving multi-channel multi-function chip comprises three or more than three functional modules, namely a low noise amplifier, a power amplifier, a mixer, a frequency converter, a phase shifter, an attenuator and channel switching, and the number of input channels N2 of the receiving multi-channel multi-function chip is more than or equal to 2.

Furthermore, the antenna units of the receiving antenna array are planar antennas, horn antennas, helical antennas, or the like, or package antennas, on-chip antennas, or the like, and the antenna array may be a one-dimensional linear array, a two-dimensional planar array, a multi-dimensional array, or the like.

Further, the number of receive and transmit multi-channel multifunction chips may be different, as may the number of output channels of the receive and transmit multi-channel multifunction chips.

Furthermore, the intermediate frequency network has two implementation modes, wherein firstly, all intermediate frequency signals are directly connected with the input interface of the signal processing board, and secondly, the intermediate frequency network is connected with the input port of the signal processing board in a mode of combining the power division network and the switch matrix.

Furthermore, the control system has a voltage conversion function, and converts the externally provided direct current or alternating current voltage into the working voltage required by the receiving and transmitting multi-channel multifunctional chip.

Furthermore, the control system has a certain storage function, a time sequence truth table of the active millimeter wave terahertz transceiving array is stored inside the control system, and the control signal levels of the receiving and transmitting multi-channel multifunctional chip and the intermediate frequency network are controlled to output high and low levels according to the truth table through an external starting trigger signal, so that time sequence control is realized. The control system comprises a control signal in an initial state outside, and can forcibly restore the control signals of the receiving and transmitting multi-channel multifunctional chip and the intermediate frequency network to the original state at any time.

Furthermore, the beam scanning function of the active millimeter wave transceiving array is to adjust the phases and amplitudes of phase shifters and attenuators in the receiving and transmitting multi-channel multifunctional chip and adjust the synthesis weight coefficients of different antenna units by a control system so as to realize the automatic scanning of the beam direction.

Furthermore, the transmitting signal of the active millimeter wave transceiving array is transmitted to the input end of the transmitting multi-channel multifunctional chip through the transmitting feed network, the corresponding transmitting multi-channel multifunctional chip is opened by the external trigger signal through the control system, the transmitting signal is changed into a transmitting signal of a higher frequency band through the transmitting multi-channel multifunctional chip, the transmitting signal is transmitted to the input end of the transmitting antenna array, and the transmitting signal is radiated to the space through the antenna.

Furthermore, the receiving local oscillation signal of the active millimeter wave transceiving array is transmitted to the receiving multi-channel multifunctional chip through the receiving feed network, so as to provide the local oscillation signal for the frequency mixing function of the receiving multi-channel multifunctional chip. The receiving antenna array receives a spatial reflection signal, an external trigger signal simultaneously opens corresponding channels for receiving the multi-channel multifunctional chip and the intermediate frequency network through the control system, and the reflection signal is converted into an intermediate frequency signal through the functions of amplification, frequency mixing and the like of the receiving multi-channel multifunctional chip. And the intermediate frequency signal channel intermediate frequency network transmits the intermediate frequency signal channel intermediate frequency network to a signal processing board for subsequent data processing.

Compared with the prior art, the invention has the following advantages: compared with a common switch matrix, the active millimeter wave terahertz array has the advantages that the range of the use frequency band can be higher, and high integration, miniaturization and commercialization can be realized; when the frequency band reaches a high frequency band, the antenna array and the multi-channel multifunctional chip can be integrated together, the size of the receiving and transmitting array is further reduced, a handheld system can be realized in various fields such as security inspection, medical treatment, radar and the like, and the antenna array is worthy of popularization and application.

Drawings

Fig. 1 is a schematic structural diagram of an active millimeter wave terahertz transceiving array in an embodiment of the present invention;

fig. 2 is a schematic diagram of a power division network in a transmit/receive feed network in an embodiment of the present invention;

FIG. 3 is a schematic diagram of an architecture of a transmit multi-channel multifunction chip in an embodiment of the invention;

FIG. 4 is a block diagram of an embodiment of a receiving multi-channel multifunction chip.

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 active millimeter wave terahertz transceiving array of the present embodiment includes: a transmit active array 100, a receive active array 200, an intermediate frequency network 300, and a control system 400. The transmit active array 100 includes a transmit feed network 110, a transmit multi-channel multifunction chip 120, and a transmit antenna array 130. The receive active array 200 includes a receive feed network 210, a receive multi-channel multifunction chip 220, and a receive antenna array 230. The intermediate frequency network 300 is a network in which an intermediate frequency signal mixed by the receiving multi-channel multi-function chip 220 is connected to the signal processing board, and the control system 400 includes two functional modules of power supply and time sequence control, and is connected to the control interfaces of the receiving multi-channel multi-function chip (the transmitting multi-channel multi-function chip 120 and the receiving multi-channel multi-function chip 220) and the intermediate frequency network 300 through specific interfaces, so as to control the receiving multi-channel multi-function chip and the intermediate frequency network 300 to perform channel switching according to a certain time sequence.

Preferably, in this embodiment, the transmitting feeding network 110 is a multi-stage power divider network cascade, which has an input port and M1(M1 is greater than or equal to 2) output ports, and as shown in fig. 2, it is formed by cascading a first-stage power divider 111, a second-stage power divider 112, a third-stage power divider 113, and other multi-stage power dividers. Each output port of the transmit feed network 110 is connected to one transmit multi-channel multifunction chip 120, providing radio frequency signals to each transmit multi-channel multifunction chip 120.

Preferably, in this embodiment, the multi-channel multi-function transmitting chip 120 has functional components such as a channel switch, a frequency multiplier, a power amplifier, etc., and a preferred structure of the multi-channel multi-function transmitting chip 120 is shown in fig. 3, where N1 of the output channel of the multi-channel multi-function transmitting chip 120 is greater than or equal to 2, each output channel of the multi-channel multi-function transmitting chip 120 is connected to each transmitting antenna unit in the transmitting antenna array 130, and if beam combining is required, a phase shifter and an attenuator are added to the multi-channel multi-function transmitting chip 120.

Preferably, in this embodiment, the transmitting antenna array 130 is a one-dimensional linear array formed by mixing a planar antenna and a horn antenna.

Preferably, in this embodiment, the receiving feed network 210 is a multi-stage power division network cascade, and has an input port and M2(M2 is greater than or equal to 2) output ports, the receiving feed network 210 has the same form as the transmitting feed network 110, as shown in fig. 2, the output port of the receiving feed network 210 is connected to the receiving multi-channel multi-function chip 220, and provides the local oscillation signal for the receiving multi-channel multi-function chip 220.

Preferably, in this embodiment, as shown in fig. 4, the receiving multi-channel multi-function chip 220 includes functional components such as channel switches, frequency multipliers, power amplifiers, mixers, and low noise amplifiers, and the receiving multi-channel multi-function chip 220 has N2+1 input ports and N2 output ports, where N2 is greater than or equal to 2. N2 of the N2+1 input ports are connected to the receive antenna array 230, and the remaining 1 input port provides a local oscillator signal to the receive multi-channel multifunction chip 220. The N2 output ports output intermediate frequency signals.

Preferably, in this embodiment, the if network 300 adopts a mode that all if signals are connected to the input interface of the signal processing board, and the receiving of part of if signals is realized through timing control.

Preferably, in this embodiment, the voltage conversion mode of the control system 400 is a hybrid form of DC-DC and LDO, and converts the externally supplied DC high voltage into the required DC power.

Preferably, in this embodiment, the control platform of the control system 400 is an FPGA, the FPGA stores a pre-stored truth table therein, and the truth table is read continuously by an external trigger signal and output to the control lines Ti and Ri of the transmitting and receiving multi-channel multifunctional chip in parallel, so as to control the switching of the transmitting and receiving channels.

In summary, compared with a common switch matrix, the active millimeter wave terahertz array of the embodiment has a wider range of a use frequency band, and can realize high integration, miniaturization and commercialization; when the frequency band reaches a high frequency band, the antenna array and the multi-channel multifunctional chip can be integrated together, the size of the receiving and transmitting array is further reduced, a handheld system can be realized in various fields such as security inspection, medical treatment, radar and the like, and the antenna array is worthy of popularization and application.

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.