CN111988052B - Receiving antenna circuit, transmitting antenna circuit and security check instrument - Google Patents
Receiving antenna circuit, transmitting antenna circuit and security check instrument Download PDFInfo
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- CN111988052B CN111988052B CN202010752867.8A CN202010752867A CN111988052B CN 111988052 B CN111988052 B CN 111988052B CN 202010752867 A CN202010752867 A CN 202010752867A CN 111988052 B CN111988052 B CN 111988052B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The application discloses receiving antenna circuit, transmitting antenna circuit and security check appearance, receiving antenna circuit includes receiving array antenna, down converter and intermediate frequency amplifier, receiving array antenna's output is connected with the input of down converter, coaxial cable connection intermediate frequency amplifier is passed through to the output of down converter, the down converter is used for passing through coaxial cable with the intermediate frequency ripples of output and transmits to intermediate frequency amplifier to shorten the transmission route of millimeter wave signal by the down converter. Through above-mentioned mode, can directly transmit the millimeter wave signal that receiving array antenna received to the down converter, the down converter converts the millimeter wave signal of receiving into the intermediate frequency wave to make the intermediate frequency wave transmit to intermediate frequency amplifier on coaxial cable, improve the imaging definition of security check appearance.
Description
Technical Field
The application relates to the technical field of millimeter waves, in particular to a receiving antenna circuit, a transmitting antenna circuit and a security check instrument.
Background
At present, millimeter wave signals received by one end of a receiving array antenna in an active millimeter wave imaging security inspection instrument on the market are directly transmitted to a down converter 1-4 meters away from the receiving array antenna through a plurality of switches and a coaxial cable so as to convert the millimeter wave signals into intermediate frequency signals. However, millimeter wave signals are directly transmitted in a plurality of switches and coaxial cables without being amplified, so that the millimeter wave signals are interfered, phase distortion is generated, and the imaging definition is reduced.
Disclosure of Invention
The technical problem that this application mainly solved provides a receiving antenna circuit, transmitting antenna circuit and security check appearance, can improve the imaging definition.
In order to solve the technical problem, the application adopts a technical scheme that: receiving antenna circuit, the circuit includes receiving array antenna, down converter and intermediate frequency amplifier, receiving array antenna's output with the input of down converter is connected, the output of down converter passes through coaxial cable and connects intermediate frequency amplifier, the down converter is used for passing through the intermediate frequency wave of output coaxial cable transmits extremely intermediate frequency amplifier, with by the down converter shortens the transmission path of millimeter wave signal.
The receiving antenna circuit further comprises a time sequence control circuit, and the time sequence control circuit is used for controlling the time sequence of the intermediate frequency wave transmitted to the intermediate frequency amplifier through the coaxial cable.
The output end of the receiving array antenna is connected with the input end of the time sequence control circuit, the output end of the time sequence control circuit is connected with the input end of the down converter, and the output end of the down converter is connected with the input end of the intermediate frequency amplifier through the coaxial cable.
The output end of the receiving array antenna is connected to the input end of the corresponding down converter, the output end of the down converter is connected to the same input end of the time sequence control circuit, and the output end of the time sequence control circuit is connected to the input end of the intermediate frequency amplifier through the coaxial cable.
The output end of the receiving array antenna is connected to the input end of the corresponding down converter, the output end of the down converter is connected to the same input end of the time sequence control circuit through the coaxial cable, and the output end of the time sequence control circuit is connected to the input end of the intermediate frequency amplifier.
The down converter is a passive device, the receiving antenna circuit further comprises an amplifier, and the input end of the amplifier is connected to the output end of the down converter.
The down converter is an active device and is used for reducing the influence of the coaxial cable on the intermediate frequency wave output by the down converter.
The circuit further comprises an antenna change-over switch, one end of the antenna change-over switch is connected with the output end of the down converter through the coaxial cable, and the other end of the antenna change-over switch is connected with the input end of the intermediate frequency amplifier through the coaxial cable.
In order to solve the above technical problem, the present application adopts another technical solution: a transmitting antenna circuit is provided, which comprises a transmitting array antenna and a power amplifier, wherein the output end of the power amplifier is connected with the input end of the transmitting array antenna.
In order to solve the above technical problem, the present application adopts another technical solution: the utility model provides a security check appearance, the security check appearance includes driver, security check casing, receiving antenna circuit and transmitting antenna circuit, the driver the receiving antenna circuit with transmitting antenna circuit set up in inside the security check casing, the driver is used for the drive transmitting antenna circuit transmission millimeter wave, receiving antenna circuit is used for receiving the millimeter wave of transmitting antenna circuit transmission.
The beneficial effects of the embodiment of the application are that: the receiving antenna circuit in the embodiment of the application comprises a receiving array antenna, a down converter and an intermediate frequency amplifier, wherein the output end of the receiving array antenna is connected with the input end of the down converter, the output end of the down converter is connected with the intermediate frequency amplifier through a coaxial cable, and the down converter is used for transmitting output intermediate frequency waves to the intermediate frequency amplifier through the coaxial cable so as to shorten the transmission route of millimeter wave signals through the down converter. This application is with millimeter wave signal direct transmission to the down converter that receiving array antenna received, and the down converter turns into the millimeter wave signal of receiving intermediate frequency wave to make intermediate frequency wave transmit to intermediate frequency amplifier on coaxial cable, avoid the millimeter wave signal to produce the phase distortion, improved the imaging definition.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a first embodiment of a receiving antenna circuit according to the present application;
fig. 2 is a schematic circuit diagram of a second embodiment of the receiving antenna circuit of the present application;
fig. 3 is a schematic circuit diagram of a third embodiment of the receiving antenna circuit of the present application;
fig. 4 is a schematic circuit diagram of a fourth embodiment of the receiving antenna circuit of the present application;
fig. 5 is a schematic circuit diagram of an embodiment of a transmitting antenna circuit according to the present application;
fig. 6 is a schematic structural diagram of an embodiment of the security check apparatus of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
As shown in fig. 1, fig. 1 is a schematic circuit structure diagram of a first embodiment of a receiving antenna circuit of the present application. The receiving antenna circuit 10 of the present embodiment includes a receiving array antenna 11, a down converter 12, and an intermediate frequency amplifier 13.
The output end of the receiving array antenna 11 is connected to the input end of the down converter 12, and the output end of the down converter 12 is connected to the intermediate frequency amplifier 13 through a coaxial cable. Receiving array antenna 11 transmits received millimeter wave signal to down converter 12's input through receiving array antenna 11's output, through the inside circuit of down converter 12, and down converter 12's output intermediate frequency wave, intermediate frequency wave pass through coaxial cable and transmit to intermediate frequency amplifier 13's input, has shortened the transmission route of millimeter wave signal.
In this way, compared with the method of transmitting the received millimeter wave signal to the down converter 12 through the coaxial cable, the down converter 12 is directly connected to the receiving array antenna 11 in this embodiment, so that the millimeter wave signal received by the receiving array antenna 11 is converted into the intermediate frequency wave by the down converter 12 for output, and the intermediate frequency wave is transmitted to the intermediate frequency amplifier 13 through the coaxial cable, thereby avoiding the phase distortion of the millimeter wave signal directly transmitted on the coaxial cable. In addition, because the millimeter wave signal received by the receiving array antenna 11 is a broadband, the broadband millimeter wave signal is directly transmitted on the coaxial cable, and inconsistent phase distortion and amplitude distortion are generated, the broadband millimeter wave signal is converted into an intermediate frequency wave by the down converter and transmitted on the coaxial cable, so that the imaging definition is improved.
In order to control the timing of the intermediate frequency waves transmitted to the intermediate frequency amplifier 13 through the coaxial cable, the reception antenna circuit 10 further includes a timing control circuit. It should be noted that the timing control circuit may also be replaced by a single chip or a programmable array, and the like, which is not limited herein. Specific arrangement positions of the timing control circuit can be referred to the following embodiments.
Further, the receiving antenna circuit 10 further includes an antenna switch 15, one end of the antenna switch 15 is connected to the output end of the down converter 12 through a coaxial cable, and the other end of the antenna switch 15 is connected to the input end of the if amplifier 13 through a coaxial cable, and the antenna switch 15 is configured to control a timing of transmitting the if waves to the if amplifier 14.
For the type of downconverter 12, downconverter 12 may, in some embodiments, be an active device for reducing the effect of the coaxial cable on the intermediate frequency waves output by downconverter 12. In other embodiments, down converter 12 may be a passive device, and in order to avoid the influence of the coaxial cable on the output of down converter 12, receiving antenna circuit 10 further includes an amplifier, the input of which is connected to the output of down converter 12.
As shown in fig. 2, fig. 2 is a schematic circuit structure diagram of a second embodiment of the receiving antenna circuit of the present application. The receiving antenna circuit 20 of the present embodiment includes a receiving array antenna 21, a down converter 22, an intermediate frequency amplifier 23, and a timing control circuit 24.
The output ends of the multiple receiving array antennas 21 are connected to the input end of the timing control circuit 24, the output end of the timing control circuit 24 is connected to the input end of the down-converter 22, and the output end of the down-converter 22 is connected to the input end of the intermediate frequency amplifier 23 through a coaxial cable. A plurality of millimeter wave signals are received to a plurality of receiving array antennas 21, transmit a plurality of millimeter wave signals to time sequence control circuit 24, and time sequence control circuit 24 is used for controlling the time sequence of a plurality of millimeter wave signals, and a plurality of millimeter wave signals transmit the input of same down converter 22, through the inside circuit of down converter 22 for down converter 22's output intermediate frequency wave, intermediate frequency wave passes through coaxial cable and transmits to intermediate frequency amplifier 23's input.
Through the above mode, directly be connected down converter 22 with receiving array antenna 21 for a plurality of millimeter wave signals that receiving array antenna 21 received convert the intermediate frequency ripples via same down converter 22 and export, and the intermediate frequency ripples passes through coaxial cable and transmits to intermediate frequency amplifier 23, has shortened the transmission route of millimeter wave signal, has avoided the direct phase distortion of transmitting on coaxial cable of millimeter wave signal. Moreover, because the millimeter wave signal received by the receiving array antenna 21 is a broadband, generally between 8GHz and 20GHz, the millimeter wave signal is directly transmitted to the down converter 22 through the coaxial cable, and inconsistent phase distortion and amplitude distortion are generated, in this embodiment, the millimeter wave signal of the broadband is converted into an intermediate frequency wave through the down converter 22, so that the intermediate frequency wave is transmitted through the coaxial cable, and the influence of distortion on the imaging definition is avoided.
As shown in fig. 3, fig. 3 is a schematic circuit structure diagram of a third embodiment of the receiving antenna circuit of the present application. The receiving antenna circuit 30 of the present embodiment includes a receiving array antenna 31, a down converter 32, an intermediate frequency amplifier 33, and a timing control circuit 34.
The output ends of the plurality of receiving array antennas 31 are connected to the input ends of the corresponding down converters 32, the output ends of the plurality of down converters 32 are connected to the input end of the same timing control circuit 34, and the input end of the timing control circuit 34 is connected to the input end of the intermediate frequency amplifier 33 through a coaxial cable.
The plurality of receiving array antennas 31 receive a plurality of millimeter wave signals, transmit the plurality of millimeter wave signals to the input end of the corresponding down converter 32, the plurality of millimeter wave signals pass through the circuits inside the plurality of down converters 32, so that the output end of the down converter 32 outputs intermediate frequency waves, the intermediate frequency waves are transmitted to the intermediate frequency amplifier 33 through the same coaxial cable, and the timing control circuit 34 is used for controlling the timing sequence of the intermediate frequency waves transmitted to the intermediate frequency amplifier 33.
Through the above mode, directly be connected down converter 32 with receiving array antenna 31 for the millimeter wave signal that receiving array antenna 31 received converts the intermediate frequency wave output into via a plurality of down converters 32, and the intermediate frequency wave transmits to intermediate frequency amplifier 33 through same coaxial cable, has shortened the transmission route of millimeter wave signal, has avoided the direct phase distortion of transmitting on coaxial cable of millimeter wave signal. Moreover, because the millimeter wave signal received by the receiving array antenna 31 is a wide frequency band, when the millimeter wave signal is directly transmitted to the down converter on the coaxial cable, inconsistent phase distortion and amplitude distortion are generated, in this embodiment, the millimeter wave signal of the wide frequency band is converted into an intermediate frequency wave through the down converter 32, so that the intermediate frequency wave is transmitted through the coaxial cable, the phase distortion and the amplitude distortion are avoided, and the imaging definition is improved. Since the coaxial cable for millimeter wave transmission is higher in cost than the coaxial cable for intermediate frequency wave transmission, the millimeter wave signal is converted into the intermediate frequency wave, so that the intermediate frequency wave is transmitted to the intermediate frequency amplifier 33 through the coaxial cable, and the production cost of the product is reduced.
As shown in fig. 4, fig. 4 is a schematic circuit structure diagram of a fourth embodiment of the receiving antenna circuit of the present application. The receiving antenna circuit 40 of the present embodiment includes a receiving array antenna 41, a down converter 42, an intermediate frequency amplifier 43, and a timing control circuit 44.
The output ends of the plurality of receiving array antennas 41 are connected to the input ends of the corresponding down converters 42, the output ends of the plurality of down converters 42 are connected to the input end of the same timing control circuit 44 through a plurality of coaxial cables, and the output end of the timing control circuit 44 is connected to the input end of the intermediate frequency amplifier 43.
The plurality of receiving array antennas 41 receive the plurality of millimeter wave signals, and transmit the plurality of millimeter wave signals to the input end of the corresponding down converter 42, the plurality of millimeter wave signals pass through the circuit inside the corresponding down converter 42, so that the output ends of the plurality of down converters 42 output intermediate frequency waves, the intermediate frequency waves are transmitted to the intermediate frequency amplifier 43 through the plurality of coaxial cables, and the timing control circuit 44 is configured to control the timing of transmitting the intermediate frequency waves to the intermediate frequency amplifier 43.
In the above embodiment, the down converter 42 is directly connected to the receiving array antenna 41, so that the millimeter wave signal received by the receiving array antenna 41 is converted into the intermediate frequency wave by the down converters 42 and output, and the intermediate frequency wave is transmitted to the intermediate frequency amplifier 43 through the coaxial cables, thereby shortening the transmission path of the millimeter wave signal and avoiding the phase distortion of the millimeter wave signal directly transmitted on the coaxial cables. In addition, since the millimeter wave signal received by the receiving array antenna 41 is a wide frequency band, the millimeter wave signal is directly transmitted to the down converter 42 through the coaxial cable, and inconsistent phase distortion and amplitude distortion are generated, in this embodiment, the wide frequency band millimeter wave signal is converted into an intermediate frequency wave through the down converter 42, and the intermediate frequency wave is transmitted through the coaxial cable, so that the influence of distortion on the imaging definition is avoided. Since the coaxial cable for millimeter wave transmission is more expensive than the coaxial cable for intermediate frequency wave transmission, the millimeter wave signal is converted into an intermediate frequency wave, so that the intermediate frequency wave is transmitted to the intermediate frequency amplifier 43 through the coaxial cable, thereby reducing the production cost of the product.
As shown in fig. 5, fig. 5 is a schematic circuit structure diagram of an embodiment of the transmitting antenna circuit of the present application. The transmitting antenna circuit 50 includes a transmitting array antenna 51 and a power amplifier 52, and an output terminal of the power amplifier 52 is connected to an input terminal of the transmitting array antenna 51. The intermediate frequency waves pass through a power amplifier 52 to obtain millimeter waves, the millimeter waves are transmitted to the input end of the transmitting array antenna 51, and the millimeter waves are transmitted from the output end of the transmitting array antenna 51.
As shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the security inspection apparatus of the present application. The security check instrument 60 comprises a driver 61, a security check shell 62, a receiving antenna circuit 63 and a transmitting antenna circuit 64, wherein the driver 61, the receiving antenna circuit 63 and the transmitting antenna circuit 64 are arranged inside the security check shell 62, the driver 61 is used for driving the transmitting antenna circuit 64 to transmit millimeter waves, and the receiving antenna circuit 63 is used for receiving the millimeter waves transmitted by the transmitting antenna circuit 64.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (6)
1. The utility model provides a receiving antenna circuit, its characterized in that, the circuit includes receiving array antenna, sequential control circuit, antenna change over switch, down converter and intermediate frequency amplifier, receiving array antenna's output with the input of down converter is connected, the output of down converter with sequential control circuit's input is connected, sequential control circuit's output passes through coaxial cable and connects antenna change over switch's one end, antenna change over switch's the other end passes through coaxial cable connects intermediate frequency amplifier's input, the down converter is used for passing through the intermediate frequency wave of output coaxial cable transmit extremely intermediate frequency amplifier, with by the transmission route of millimeter wave signal is shortened to the down converter.
2. The receive antenna circuit of claim 1, wherein outputs of a plurality of the receive array antennas are connected to inputs of corresponding downconverters, and outputs of a plurality of the downconverters are connected to inputs of the same timing control circuit.
3. The receive antenna circuit of claim 1, wherein the outputs of a plurality of the receive array antennas are connected to the inputs of corresponding downconverters, and wherein the outputs of a plurality of the downconverters are connected to the input of the same timing control circuit via the coaxial cable.
4. The receive antenna circuit of any of claims 2-3, wherein the downconverter is a passive device, the receive antenna circuit further comprising an amplifier having an input connected to the output of the downconverter.
5. The receive antenna circuit of any of claims 2-3, wherein the downconverter is an active device configured to reduce the effect of the coaxial cable on the intermediate frequency waves output by the downconverter.
6. A security check instrument is characterized by comprising a driver, a security check shell, the receiving antenna circuit and the transmitting antenna circuit, wherein the receiving antenna circuit and the transmitting antenna circuit are arranged in the security check shell, the driver is used for driving the transmitting antenna circuit to transmit millimeter waves, and the receiving antenna circuit is used for receiving the millimeter waves transmitted by the transmitting antenna circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010752867.8A CN111988052B (en) | 2020-07-30 | 2020-07-30 | Receiving antenna circuit, transmitting antenna circuit and security check instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010752867.8A CN111988052B (en) | 2020-07-30 | 2020-07-30 | Receiving antenna circuit, transmitting antenna circuit and security check instrument |
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| Publication Number | Publication Date |
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| CN111988052A CN111988052A (en) | 2020-11-24 |
| CN111988052B true CN111988052B (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010752867.8A Active CN111988052B (en) | 2020-07-30 | 2020-07-30 | Receiving antenna circuit, transmitting antenna circuit and security check instrument |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417036C (en) * | 2004-04-02 | 2008-09-03 | 大唐移动通信设备有限公司 | Message machine of receiving-transmitting time-division duplex wireless communication system |
| CN202013428U (en) * | 2010-12-24 | 2011-10-19 | 北京遥感设备研究所 | Active millimeter wave near-field scanning imaging security inspection device |
| CN105049102A (en) * | 2015-08-07 | 2015-11-11 | 苏州市吴通天线有限公司 | High-frequency millimeter wave integrated antenna system |
| CN105866850B (en) * | 2016-06-03 | 2018-06-01 | 中国工程物理研究院电子工程研究所 | A kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic |
| CN106019275B (en) * | 2016-07-06 | 2018-05-29 | 深圳市华讯方舟太赫兹科技有限公司 | Millimeter wave imaging system and safe examination system |
| CN106019276B (en) * | 2016-08-03 | 2018-11-23 | 华讯方舟科技有限公司 | A kind of mm-wave imaging device |
| CN108627827B (en) * | 2018-03-22 | 2021-05-04 | 苏州速感智能科技有限公司 | Device and method for realizing millimeter wave radar wide-area long-distance target detection |
| CN110798843A (en) * | 2019-12-05 | 2020-02-14 | 广州市瀚云信息技术有限公司 | 5G signal radio frequency distribution system |
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Effective date of registration: 20211110 Address after: 518000 room 430, building 37, chentian Industrial Zone, Baotian 1st Road, Xixiang street, Bao'an District, Shenzhen, Guangdong Applicant after: Shenzhen Zhongtou Huaxun Terahertz Technology Co.,Ltd. Address before: 518102 East floor, building 37, chentian Industrial Zone, Baotian 1st Road, Xixiang street, Bao'an District, Shenzhen, Guangdong Applicant before: SHENZHEN INSTITUTE OF TERAHERTZ TECHNOLOGY AND INNOVATION Co.,Ltd. Applicant before: Shenzhen heavy investment Huaxun terahertz Group Co.,Ltd. |
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