CN111157989A - Millimeter wave processing device and millimeter wave scanning system - Google Patents
Millimeter wave processing device and millimeter wave scanning system Download PDFInfo
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- CN111157989A CN111157989A CN201911349326.4A CN201911349326A CN111157989A CN 111157989 A CN111157989 A CN 111157989A CN 201911349326 A CN201911349326 A CN 201911349326A CN 111157989 A CN111157989 A CN 111157989A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The present invention provides a millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus includes: the device comprises a millimeter wave local oscillator signal generating module, a transmitting module and a transmitting module. The millimeter wave local oscillation signal generation module comprises: the millimeter wave frequency source is used for generating a first millimeter wave local oscillation signal; and the delay unit is used for carrying out delay processing on the first millimeter wave local oscillation signal generated by the millimeter wave frequency source so as to generate a second millimeter wave local oscillation signal. The transmitting module mixes a predetermined baseband signal with a first millimeter wave local oscillator signal generated by a millimeter wave frequency source to convert the predetermined baseband signal into the transmitting signal to be transmitted. And the transmitting module mixes the second millimeter wave local oscillation signal generated by the delay unit with the echo signal received by the receiving module so as to convert the echo signal into an intermediate frequency signal to be processed.
Description
Technical Field
The present invention relates to a millimeter wave processing apparatus and a millimeter wave scanning system.
Background
With the development of radar technology, Synthetic Aperture Radar (SAR) has been expanded from the application of the simple military field to the civil field, from the remote detection of outer space to the ground to the detection of human hazardous articles at close range, and from the reconstruction of planar static two-dimensional images to three-dimensional dynamic imaging. The development of the microwave transceiver is inseparable with the progress of the microwave transceiver channel technology, and particularly from the current development of the microwave transceiver channel, the microwave transceiver channel has higher and higher working frequency band, wider and wider working frequency band, higher and higher integration level, better and better electrical property and lower cost.
For a microwave three-dimensional imaging transceiving system, the higher the working frequency band is, the more easily a large absolute bandwidth is obtained under the condition of a certain relative bandwidth, and further the more easily a high distance resolution is obtained; while a higher frequency band makes it easier to obtain a high azimuth and range resolution. Therefore, the working frequency band of the microwave three-dimensional imaging transceiving system has been developed from centimeter waves to 8mm, even 3 mm. Meanwhile, the higher the working frequency band is, the higher the cost of the microwave device and the assembly cost of the components are, so that a proper scheme needs to be selected on the premise that the performance requirement of the transceiving system is met.
At present, the millimeter wave processing device is mainly applied to the fields of aerospace, 5G communication, vehicle-mounted radar and the like, is used for realizing functions of space data communication, high-precision measurement positioning and the like, and generally has narrow working instantaneous bandwidth or is applied in a dot frequency mode.
Millimeter wave three-dimensional imaging is to form three-dimensional imaging geometry by transmitting broadband signals to a pitch dimension, an azimuth dimension and a distance dimension, so as to record the amplitude and phase information of target scattering and reconstruct a three-dimensional complex image of the target, wherein the image contains information such as the shape, the structure and the scattering characteristics of the target. In order to obtain a high-resolution range image and a clearer image quality, a broadband signal form is required. The existing millimeter wave processing device is basically a narrow-band system, so that the application of a three-dimensional imaging system cannot be met.
Because the millimeter wave three-dimensional imaging receiving and transmitting system is very close to the human body and ranges from several centimeters to dozens of centimeters, and the active millimeter wave human body security inspection system is real-time imaging, in order to complete the linear frequency modulation (Dechirp) operation, the delay of the local oscillator of the system is required to be the same as that of the transmitting and receiving channel of the system.
Disclosure of Invention
In view of this, the present invention provides a millimeter wave processing apparatus and a millimeter wave scanning system, which are suitable for an active millimeter wave human body security inspection system, and perform millimeter wave signal receiving and transmitting acquisition on close-range target information, and can implement synchronous operation of a millimeter wave local oscillator signal and a receiving and transmitting link, thereby implementing real-time imaging of the millimeter wave scanning system.
According to an aspect of the present invention, there is provided a millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus includes: millimeter wave local oscillator signal produces the module, and this millimeter wave local oscillator signal produces the module and includes: the millimeter wave frequency source is used for generating a first millimeter wave local oscillation signal; the transmitting module is used for mixing a preset baseband signal with the first millimeter wave local oscillation signal generated by the millimeter wave frequency source so as to convert the preset baseband signal into the transmitting signal to be transmitted; and the receiving module is used for mixing the second millimeter wave local oscillation signal generated by the time delay unit with the echo signal received by the receiving module so as to convert the echo signal into an intermediate frequency signal to be processed.
Preferably, the delay unit sets the delay of the first millimeter wave local oscillator signal according to a distance between the millimeter wave processing device and the object to be scanned.
Preferably, the millimeter wave local oscillation signal generating module further includes a coupler, the coupler couples and divides the millimeter wave local oscillation signal generated by the millimeter wave frequency source into a coupled signal and a main signal, the coupled signal is input to the transmitting module as the first millimeter wave local oscillation signal at the transmitting side to be mixed with the predetermined baseband signal, and the main signal is delayed by the delay unit and then input to the receiving module as the second millimeter wave local oscillation signal at the receiving side to be mixed with the echo signal.
Preferably, the millimeter wave local oscillation signal generating module further includes a filter and an amplifier, and the millimeter wave local oscillation signal generated by the millimeter wave frequency source is filtered and amplified by the filter and the amplifier and then is input to the coupler.
Preferably, the transmission module includes: and the transmitting side frequency mixer is used for mixing the first millimeter wave local oscillator signal with the preset baseband signal to realize up-conversion of the preset baseband signal.
Preferably, the receiving module further comprises: and the receiving side frequency mixer mixes the received echo signal with the second millimeter wave local oscillation signal to realize down-conversion of the echo signal.
Preferably, the transmission module further comprises: and the flatness adjusting part on the transmitting side inputs the transmitting signal up-converted by the frequency mixer on the transmitting side into the flatness adjusting part on the transmitting side so as to adjust the flatness in the transmitting power band of the transmitting signal of the transmitting module.
Preferably, the receiving module further comprises: and the echo signal received by the receiving module is input to the flatness adjusting part of the receiving side so as to adjust the flatness in a receiving gain band of the echo signal of the receiving module, and the echo signal adjusted by the flatness adjusting part is input to the receiving side mixer.
Preferably, the operating bandwidth of the millimeter wave processing device is 30-40 GHz.
According to another aspect of the present invention, there is provided a millimeter wave scanning system for scanning an object to be scanned, including: the millimeter wave processing apparatus according to the above-described aspect; and a transmitting antenna and a receiving antenna, the millimeter wave processing device radiating a millimeter wave transmitting signal to the object to be scanned via the transmitting antenna and receiving a millimeter wave echo signal reflected from the object to be scanned via the receiving antenna.
Advantageous effects of the invention
The invention provides a millimeter wave processing device and a millimeter wave scanning system, which are used for receiving and transmitting millimeter wave signals for short-distance target information, and a delay circuit for delaying a millimeter wave local oscillator signal is arranged, so that synchronous work of the millimeter wave local oscillator signal and a receiving and transmitting link can be realized, and real-time imaging of the millimeter wave scanning system is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
Fig. 1 is a block diagram of the configuration of a millimeter wave scanning system according to the present invention.
Fig. 2 is a block diagram of a configuration of a millimeter wave local oscillation signal generating module according to an embodiment of the present invention.
Fig. 3 is a block diagram of a configuration of a millimeter wave local oscillation signal generating module according to another embodiment of the present invention.
Fig. 4 is a block diagram of a configuration of a transmitting module according to an embodiment of the present invention.
Fig. 5 is a block diagram of a configuration of a receiving module according to an embodiment of the present invention.
Fig. 6 illustrates a gain frequency response curve of a positive slope amplifier in a millimeter wave processing apparatus according to an embodiment of the present invention.
Fig. 7 illustrates an insertion loss frequency response curve of the equalizer in the millimeter wave processing apparatus according to the embodiment of the present invention.
List of reference numerals
100: millimeter wave processing device
200: millimeter wave scanning system
1: millimeter wave local oscillator signal generating module
2: transmitting module
3: receiving module
4: transmitting antenna
5: receiving antenna
10: millimeter wave frequency source
11: time delay unit
12: coupler
13: filter with a filter element having a plurality of filter elements
14. 15, 16: amplifier with a high-frequency amplifier
21: transmitting side mixer
22: flatness adjustment unit
31: receiving side mixer
32: flatness adjustment unit
33: low noise amplifier
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
The millimeter wave scanning system and millimeter wave processing apparatus of the present invention are explained with reference to fig. 1 to 7. Fig. 1 is a block diagram of the configuration of a millimeter wave scanning system according to the present invention. Fig. 2 is a block diagram of a configuration of a millimeter wave local oscillation signal generating module according to an embodiment of the present invention. Fig. 3 is a block diagram of a configuration of a millimeter wave local oscillation signal generating module according to another embodiment of the present invention. Fig. 4 is a block diagram of a configuration of a transmitting module according to an embodiment of the present invention. Fig. 5 is a block diagram of a configuration of a receiving module according to an embodiment of the present invention. Fig. 6 illustrates a gain frequency response curve of a positive slope amplifier in a millimeter wave processing apparatus according to an embodiment of the present invention. Fig. 7 illustrates an insertion loss frequency response curve of the equalizer in the millimeter wave processing apparatus according to the embodiment of the present invention.
The millimeter wave scanning system and the millimeter wave processing device are applied to a human body security check processing device. The millimeter wave processing apparatus of the present invention processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned.
In an embodiment of the millimeter wave processing apparatus of the present invention, as shown in fig. 1, the millimeter wave processing apparatus 100 includes: the device comprises a millimeter wave local oscillation signal generating module 1, a transmitting module 2 and a receiving module 3. The millimeter wave local oscillation signal generation module 1 includes: the millimeter wave frequency source 10, the millimeter wave frequency source 10 is used for generating a first millimeter wave local oscillation signal; and a delay unit 11, where the delay unit 11 is configured to perform delay processing on the first millimeter wave local oscillation signal generated by the millimeter wave frequency source 10 to generate a second millimeter wave local oscillation signal. The first millimeter wave local oscillation signal generated by the millimeter wave frequency source 10 is input to the transmitting module 2. The transmitting module 2 mixes the predetermined baseband signal with the first millimeter wave local oscillation signal to convert the predetermined baseband signal into a transmitting signal to be transmitted. The second millimeter wave local oscillation signal generated after the first millimeter wave local oscillation signal is delayed by the delay unit 11 is input to the receiving module 3. The receiving module 3 mixes the second millimeter wave local oscillation signal with the echo signal received by the receiving module 3 to convert the echo signal into an intermediate frequency signal to be processed.
The preset baseband signal is, for example, a video signal set in advance for scanning. The intermediate frequency signal is sent, for example, to a back end processing device for processing to image and identify the scan object.
The millimeter wave processing device is provided with the delay unit of the millimeter wave local oscillation signal, so that the synchronous work of the millimeter wave local oscillation signal and the receiving and transmitting link can be realized, and the real-time imaging of the millimeter wave scanning system is realized.
In an embodiment of the present invention, the delay unit 3 sets the delay of the first millimeter wave local oscillator signal according to a physical location of the millimeter wave scanning system. For example, the delay unit sets a delay time for the first millimeter wave local oscillation signal according to a distance (for example, several centimeters to several tens of centimeters) between the millimeter wave processing device and the object to be scanned. That is, the delay unit may fix the delay of the millimeter wave local oscillation signal according to a distance from the target object.
As a preferred example, the delay time from transmitting the transmission signal to receiving the echo signal by the millimeter wave scanning system is calculated as the design time of the delay unit according to the distance between the millimeter wave processing device (millimeter wave scanning system) and the object to be scanned and the delay time of the components in the system, so as to set the delay time of the first millimeter wave local oscillation signal.
According to the embodiment of the invention, the delay of the millimeter wave local oscillator signal is set by utilizing the distance between the millimeter wave scanning system and the object to be scanned, and the delay of the delay circuit can be set according to different physical positions of the millimeter wave scanning system, so that the delay setting of the delay circuit has adjustability.
In an embodiment of the millimeter wave local oscillation signal generating module of the present invention, as shown in fig. 2, the millimeter wave local oscillation signal generating module 1 further includes a coupler 12, where the coupler 12 couples and divides the millimeter wave local oscillation signal generated by the millimeter wave frequency source 10 into a coupled signal and a main signal, and the coupled signal is input to the transmitting module 2 as a first millimeter wave local oscillation signal at a transmitting side to be mixed with a predetermined baseband signal. The main signal is delayed by the delay unit 11 and then input to the receiving module 3 as a second millimeter wave local oscillation signal at the receiving side to be mixed with the echo signal.
In addition, in another embodiment of the millimeter wave local oscillation signal generating module of the present invention, as shown in fig. 3, the millimeter wave local oscillation signal generating module 1 may further include a filter 13 and an amplifier 14. The millimeter wave local oscillation signal generated by the millimeter wave frequency source 10 is filtered and amplified by the filter 13 and the amplifier 14, and then is input to the coupler 12. The filter 13 is, for example, a band-pass filter.
Preferably, as shown in fig. 3, the millimeter wave local oscillator signal generating module 1 further includes: the amplifier 15 amplifies the first millimeter wave local oscillation signal by the amplifier 15 and inputs the amplified signal to the transmitting module 2; and the amplifier 16, the second millimeter wave local oscillation signal is amplified by the amplifier 16 and then input to the receiving module 3.
In an embodiment of the transmitting module of the present invention, as shown in fig. 4, the transmitting module 2 includes: and a transmitting side mixer 21, wherein the transmitting side mixer 21 performs up-conversion on the predetermined baseband signal by mixing the first millimeter wave local oscillation signal with the predetermined baseband signal.
Preferably, as shown in fig. 4, the transmitting module 2 may further include a flatness adjusting section 22, to which the transmit signal up-converted by the transmit-side mixer 21 is input to adjust the in-band flatness of the transmit power of the transmit signal of the transmitting module 2. The flatness adjustment unit 22 includes, for example, a positive slope amplifier and an interstage adjustable equalizer, and performs in-band gain compensation and gain slope adjustment, respectively, to meet the requirement of in-band power flatness.
In an embodiment of the receiving module of the present invention, as shown in fig. 5, the transmitting module 3 includes: and a receiving-side mixer 31, where the receiving-side mixer 31 mixes the received echo signal with the second millimeter wave local oscillation signal to implement down-conversion of the echo signal.
Preferably, as shown in fig. 5, the receiving module 3 may further include: the flatness adjustment unit 32 receives the echo signal received by the reception module 3, and inputs the echo signal to the flatness adjustment unit 32 to adjust the flatness in the reception gain band of the echo signal of the reception module 3, and the echo signal adjusted by the flatness adjustment unit 32 is input to the reception-side mixer 31. The flatness adjustment unit 32 includes, for example, a positive slope amplifier and an interstage adjustable equalizer, and compensates the in-band gain and adjusts the gain slope, respectively, to meet the requirement of gain flatness. The frequency response curve of the positive slope amplifier is shown in fig. 6 and the frequency response curve of the equalizer is shown in fig. 7.
Further preferably, as shown in fig. 5, the receiving module 3 may further include a low noise amplifier 33 for performing low noise matching of the system, and the low noise amplifier 33 performs low noise matching on the echo signal received by the millimeter wave processing device, so as to reduce noise inside the system and improve the sensitivity of the system. The echo signal subjected to low noise matching is input to the flatness adjustment unit 32.
Echo signals and transmitting signals in the millimeter wave processing device are broadband millimeter wave Linear Frequency Modulation (LFM) signals, and the working instantaneous bandwidth is up to several GHz and even more than 10 GHz. Preferably, the operating bandwidth of the millimeter wave processing device of the invention is 30-40 GHz.
The millimeter wave scanning system 200 of the present invention is used to scan an object to be scanned. As shown in fig. 1, according to an embodiment of the present invention, millimeter wave scanning system 200 includes: the millimeter wave processing apparatus 100 of the embodiment of the present invention described above; and a transmitting antenna 4 and a receiving antenna 5. The millimeter wave processing apparatus 100 radiates a millimeter wave transmission signal to an object to be scanned via the transmission antenna 4, and receives a millimeter wave echo signal reflected from the object to be scanned via the reception antenna 5.
According to the millimeter wave processing device and the millimeter wave scanning system provided by the embodiment of the invention, the delay circuit for delaying the millimeter wave local oscillation signal is arranged, so that the synchronous work of the millimeter wave local oscillation signal and the receiving and transmitting link can be realized, and the real-time imaging of the millimeter wave scanning system is realized. In addition, the time delay of the millimeter wave local oscillation signal is set by utilizing the distance between the millimeter wave scanning system and the object to be scanned, so that the time delay setting of the time delay circuit can be adjusted.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict. The above exemplary embodiments are merely illustrative of the principles of the present invention and are not intended to limit the scope of the invention. Various modifications may be made by those skilled in the art without departing from the spirit and principles of the disclosure without departing from the scope thereof, which is defined by the claims.
Claims (10)
1. A millimeter wave processing apparatus that processes a transmission signal transmitted to an object to be scanned and processes an echo signal reflected from the object to be scanned, wherein the millimeter wave processing apparatus comprises:
millimeter wave local oscillator signal produces the module, and this millimeter wave local oscillator signal produces the module and includes: the millimeter wave frequency source is used for generating a first millimeter wave local oscillation signal; and a delay unit for performing delay processing on the first millimeter wave local oscillation signal generated by the millimeter wave frequency source to generate a second millimeter wave local oscillation signal,
the transmitting module mixes a predetermined baseband signal with the first millimeter wave local oscillator signal generated by the millimeter wave frequency source to convert the predetermined baseband signal into the transmitting signal to be transmitted; and
and the receiving module mixes the second millimeter wave local oscillation signal generated by the delay unit with the echo signal received by the receiving module so as to convert the echo signal into an intermediate frequency signal to be processed.
2. The millimeter wave processing device according to claim 1, wherein the delay unit sets the delay of the first millimeter wave local oscillation signal according to a distance between the millimeter wave processing device and the object to be scanned.
3. The millimeter wave processing apparatus according to claim 1 or 2, wherein the millimeter wave local oscillation signal generation module further comprises a coupler that couples and splits the millimeter wave local oscillation signal generated by the millimeter wave frequency source into a coupled signal and a main signal,
the coupled signal is input to the transmitting module as the first millimeter wave local oscillation signal of the transmitting side to be mixed with the predetermined baseband signal, and
and the main signal is delayed by the delay unit and then is input to the receiving module as the second millimeter wave local oscillation signal of the receiving side so as to be mixed with the echo signal.
4. The millimeter wave processing device according to claim 3, wherein the millimeter wave local oscillation signal generating module further comprises a filter and an amplifier, and the millimeter wave local oscillation signal generated by the millimeter wave frequency source is filtered by the filter and amplified by the amplifier and then is input to the coupler.
5. The millimeter wave processing apparatus of any of claims 1 to 4, wherein the transmitting module comprises: and the transmitting side frequency mixer is used for mixing the first millimeter wave local oscillator signal with the preset baseband signal to realize up-conversion of the preset baseband signal.
6. The millimeter wave processing apparatus of any of claims 1 to 5, wherein the receiving module further comprises: and the receiving side frequency mixer mixes the received echo signal with the second millimeter wave local oscillation signal to realize down-conversion of the echo signal.
7. The millimeter wave processing apparatus of claim 5, wherein the transmitting module further comprises:
and the flatness adjusting part on the transmitting side inputs the transmitting signal up-converted by the frequency mixer on the transmitting side into the flatness adjusting part on the transmitting side so as to adjust the flatness in the transmitting power band of the transmitting signal of the transmitting module.
8. The millimeter wave processing apparatus of claim 6, wherein the receiving module further comprises:
and the echo signal received by the receiving module is input to the flatness adjusting part of the receiving side so as to adjust the flatness in a receiving gain band of the echo signal of the receiving module, and the echo signal adjusted by the flatness adjusting part is input to the receiving side mixer.
9. The millimeter wave processing apparatus according to any one of claims 1 to 8, wherein,
the working bandwidth of the millimeter wave processing device is 30-40 GHz.
10. A millimeter wave scanning system for scanning an object to be scanned, comprising:
the millimeter wave processing apparatus of any of claims 1 to 9; and
the millimeter wave processing device radiates a millimeter wave transmitting signal to an object to be scanned via the transmitting antenna, and receives a millimeter wave echo signal reflected from the object to be scanned via the receiving antenna.
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| CN112511202A (en) * | 2020-12-15 | 2021-03-16 | 南京濠暻通讯科技有限公司 | Millimeter wave communication system |
| CN112540350A (en) * | 2020-12-23 | 2021-03-23 | 森思泰克河北科技有限公司 | Millimeter wave receiving and transmitting signal processing device and security inspection equipment |
| CN117176188A (en) * | 2023-08-17 | 2023-12-05 | 王辉 | A variable local oscillator delay frequency synthesis receiver |
| CN120934548A (en) * | 2025-10-15 | 2025-11-11 | 北京理工睿行电子科技有限公司 | Radio frequency conversion assembly |
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