CN104101867A - Multi band millimeter wave anticollision radar signal source - Google Patents
Multi band millimeter wave anticollision radar signal source Download PDFInfo
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- CN104101867A CN104101867A CN201410280425.2A CN201410280425A CN104101867A CN 104101867 A CN104101867 A CN 104101867A CN 201410280425 A CN201410280425 A CN 201410280425A CN 104101867 A CN104101867 A CN 104101867A
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- bandpass filter
- signal source
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- power amplifier
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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
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S7/032—Constructional details for solid-state radar subsystems
-
- 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
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a multi band millimeter wave anticollision radar signal source which comprises a multi band millimeter wave anticollision radar signal source circuit and a metal shielding box. The multi band millimeter wave anticollision radar signal source circuit is fixedly arranged in the metal shielding box. The millimeter wave anticollision radar signal source circuit comprises a first multiplier, a multi band bandpass filter, a first power amplifier, a second multiplier, a first bandpass filter, a second power amplifier, a first driving amplifier, a third multiplier, a second bandpass filter, a third power amplifier, a first antenna, a second antenna and a third antenna. According to the invention, the multi band millimeter wave anticollision radar signal source uses the manner of microwave signal source sharing; the number of microwave signal sources and the filters is effectively reduced; and the production cost of the millimeter wave anticollision radar signal source is greatly reduced.
Description
Technical field
The present invention relates to nearly medium and long distance automobile collision avoidance radar field, relate in particular to a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source.
Background technology
Along with the fast development of millimeter wave solid-state devices technology, computer technology, photoelectron technology, signal processing technology and millimetre integrated circuit technology, for automobile safety system provides solid industrial foundation.And automobile collision avoidance radar will be one of the most powerful field of demand growth in vehicle electric field in a few years from now on.Research finds, automobile collision avoidance radar is the revolutionary technology of tool in automobile safety system field, has great prospect of industrial development.
The fast development of automotive electronics has promoted the research and development upsurge of automobile collision avoidance radar, automotive anti-collision radar device been has all successively has been researched and developed in countries in the world, owing to there is no unified standard, cause the working frequency range of automobile collision avoidance radar many, but mainly concentrate on 24GHz, 60GHz, 77GHz.Wherein, Europe is postal is used as Vehicular radar system frequency range with the telecommunication administration council, European Telecommunication Standard institute regulation by 76-77GHz, and the regulation 46.7-46.9GHz of FCC and 76-77GHz are vehicle anti-collision radar frequency range.Japan Post(Japan Postal Service) and the regulation 60-61GHz of telecommunications portion and 76-77GHz are as vehicle anti-collision radar frequency range, the proposal as vehicle anti-collision radar frequency range by 60-61GHz and 76-77GHz has been passed through in sub-Pacific Ocean telecommunication standardization plan, and International Telecommunications Union (ITU) recommends 60-61GHz and 76-77GHz as vehicle anti-collision radar frequency range.Chinese the main frequency range using 24GHz and 77GHz as automobile collision avoidance radar research and development.
At present, there are German ADC, Siemens and Bosch company in the leading producer that is engaged in automobile anti-collision radar system exploitation, Amerigon, the Delphi of the U.S. and Eaton VORAD company, Denso, Epsilon Lambda, Fujitsu Ten, Hitachi, NEC and the Omron company of Japan.In addition also has, the Autoliv Saab company of Sweden.
Although more employing 77GHz frequency range is as the working frequency range of anti-collision radar system in the world, but 24GHz frequency range and 60GHz frequency range also have the not available advantage of 77GHz frequency range, as 24GHz anti-collision radar system have little, the integrated degree of volume high, respond to the features such as sensitive; 60GHz anti-collision radar system has the advantages such as transfer rate is high, antijamming capability strong, good directionality.So, can form a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source by multiple groups of frequency bands such as 24GHz, 60GHz, 77GHz are combined.Sort signal source combines the advantage of three frequency ranges, and the multiband collision avoidance radar signal source forming thus can greatly be improved the performance of automobile collision avoidance radar, make it to have near in collision-proof alarm far away and city evade collision and wait and pacify congruous function.
Summary of the invention
The object of the invention is in order to solve the shared problem of borne Millimeter Wave Collision Avoidance Radars signal source multiband in prior art, and propose a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source.
The present invention is for solving the problems of the technologies described above adopted scheme:
A kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source, comprises multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit and metal shielding box; Multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit is fixedly assembled in metal shielding box;
Described borne Millimeter Wave Collision Avoidance Radars signal source circuit comprises the first frequency multiplier, multiband bandpass filter, the first power amplifier, the second frequency multiplier, the first bandpass filter, the second power amplifier, the first driving amplifier, frequency tripler, the second bandpass filter, the 3rd power amplifier, the first antenna, the second antenna and third antenna;
The first frequency multiplier connects a microwave signal source by microwave connector, output terminal is connected with the input end of multiband bandpass filter, the first frequency range output terminal of multiband bandpass filter is connected with the input end of the first power amplifier, and the output terminal of the first power amplifier connects the first antenna by the first millimeter-wave signal interface; The second frequency range output terminal of multiband bandpass filter is connected with the input end of the second frequency multiplier, the output terminal of the second frequency multiplier is connected with one end of the first bandpass filter, the other end of the first bandpass filter is connected with the input end of the second power amplifier, and the output terminal of the second power amplifier connects the second antenna by the second millimeter-wave signal interface; The 3rd frequency range output terminal of multiband bandpass filter is connected with the input end of the first driving amplifier, the output terminal of the first driving amplifier is connected with the input end of frequency tripler, the output terminal of frequency tripler is connected with one end of the second bandpass filter, the second bandpass filter other end is connected with the 3rd power amplifier, and the output terminal of the 3rd power amplifier connects third antenna by the 3rd millimeter-wave signal interface.
The first described bandpass filter is identical with the second bandpass filter structures, and it is the microstrip coupled structure of zigzag, comprises two 50 ohm microstrip, six roots of sensation parallel coupled line and five coupling line connecting lines;
Six roots of sensation parallel coupled line indentation is arranged, and by the line serial connection that is of coupled connections, wherein first is connected with 50 ohm microstrip respectively by transition line with last root parallel coupled line;
Described the first frequency multiplier adopts quadruple monolithic integrated circuit, realizes the quadruple of signal source, solves existing local oscillated signal and leaks into antenna to reduce the frequency of required local oscillated signal, i.e. the problem of radio-frequency transmissions end, puies forward high-frequency degree of stability; The second frequency multiplier and frequency tripler adopt two frequency multiplication monolithic integrated circuits, realize two frequencys multiplication of signal, to obtain needed signal frequency, improve signal stabilization degree.
Described microwave connector adopts SMA coaxial connector; The first millimeter-wave signal interface adopts 2.92mm coaxial connector or the micro-band-waveguide connector of WR28, the second millimeter-wave signal interface adopts 1.85mm coaxial connector or the micro-band-waveguide connector of WR15, and the 3rd millimeter-wave signal interface adopts 1mm coaxial connector or the micro-band-waveguide connector of WR10;
Described metal shielding box is processed by brass.
The present invention contrasts prior art and has following innovative point:
1, multiband borne Millimeter Wave Collision Avoidance Radars signal source of the present invention adopts the shared mode of microwave signal source, has effectively reduced the quantity of signal source and wave filter, thereby the cost of manufacture of this borne Millimeter Wave Collision Avoidance Radars signal source is significantly reduced.
2, multiband borne Millimeter Wave Collision Avoidance Radars signal source of the present invention can make full use of the harmonic wave producing after quadruple.Traditional crashproof signal source is only utilized the main frequency after frequency multiplication, i.e. a frequency, filtering all the other unwanted harmonic waves.The present invention carries out frequency multiplication Hou tri-road signals power amplification transmitting simultaneously, has not only improved the utilization factor of signal, and can provide three frequency band signals for crashproof monitoring simultaneously.
3, multiband borne Millimeter Wave Collision Avoidance Radars signal source of the present invention adopts integrated development theory, and multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit is positioned in metal shielding box, has improved antijamming capability and the dust tightness of circuit.
Brief description of the drawings
Fig. 1 is multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit block diagram of the present invention;
Fig. 2 is toothed belt bandpass filter structural drawing of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage are more clear to be understood, below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source, comprises multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit and metal shielding box; Multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit is fixed in metal shielding box.
Described multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit comprises the first frequency multiplier 2, multiband bandpass filter 3, the first power amplifier 4, the second frequency multiplier 6, the first bandpass filter 7, the second power amplifier 8, the first driving amplifier 10, frequency tripler 11, the second bandpass filter 12, the 3rd power amplifier 13, the first antenna 5, the second antenna 9 and third antenna 14;
The first frequency multiplier 2 connects a microwave signal source 1 by microwave connector, output terminal is connected with the input end of multiband bandpass filter 3, the first frequency range output terminal of multiband bandpass filter is connected with the input end of the first power amplifier 4, and the output terminal of the first power amplifier 4 connects the first antenna 5 by the first millimeter-wave signal interface; The second frequency range output terminal of multiband bandpass filter 3 is connected with the input end of the second frequency multiplier 6, the output terminal of the second frequency multiplier 6 is connected with one end of the first bandpass filter 7, the other end of the first bandpass filter is connected with the input end of the second power amplifier 8, and the output terminal of the second power amplifier 8 connects the second antenna 9 by the second millimeter-wave signal interface; The 3rd frequency range output terminal of multiband bandpass filter 3 is connected with the input end of the first driving amplifier 10, the output terminal of the first driving amplifier 10 is connected with the input end of frequency tripler 11, the output terminal of frequency tripler 11 is connected with one end of the second bandpass filter 12, second bandpass filter 12 other ends are connected with the 3rd power amplifier 13, and the output terminal of the 3rd power amplifier connects third antenna 14 by the 3rd millimeter-wave signal interface;
As shown in Figure 2, the first described bandpass filter is identical with the second bandpass filter structures, and it is the microstrip coupled structure of zigzag, comprises two 50 ohm microstrip, six roots of sensation parallel coupled line and five coupling line connecting lines;
Six roots of sensation parallel coupled line indentation is arranged, and by the line serial connection that is of coupled connections, wherein first is connected with 50 ohm microstrip respectively by transition line with last root parallel coupled line;
Described the first frequency multiplier adopts quadruple monolithic integrated circuit, realizes the quadruple of signal source, solves existing local oscillated signal and leaks into antenna to reduce the frequency of required local oscillated signal, i.e. the problem of radio-frequency transmissions end, puies forward high-frequency degree of stability; The second frequency multiplier and frequency tripler adopt two frequency multiplication monolithic integrated circuits, realize two frequencys multiplication of signal, to obtain needed signal frequency, improve signal stabilization degree.
Described microwave connector adopts SMA coaxial connector; The first millimeter-wave signal interface adopts 2.92mm coaxial connector or the micro-band-waveguide connector of WR28, the second millimeter-wave signal interface adopts 1.85mm coaxial connector or the micro-band-waveguide connector of WR15, and the 3rd millimeter-wave signal interface adopts 1mm coaxial connector or the micro-band-waveguide connector of WR10; Power connection adopts feedthrough capacitor.
Taking 22.8GHz, 60.8GHz, present invention is described as example for 76GHz tri-frequency range borne Millimeter Wave Collision Avoidance Radars signal sources.
Microwave signal source 1 adopts sinusoidal signal or the triangle signal of 7.6GHz, after the quadruple of quadrupler 2, obtains the each harmonic of 7.6GHz.Multiband bandpass filter 3 is separated into the signal after quadruple the signal of three road different frequency ranges, and frequency is respectively 22.8GHz, 30.4GHz, 38GHz, i.e. the frequency tripling of 7.6GHz, quadruple, five frequencys multiplication.Due to quadrupler produce signal in except four times of signals each harmonic output power all very little, so the first frequency band signals, 22.8GHz signal is launched by antenna 5 after the first power amplifier 4 improves emissive power; The second frequency band signals, be that 30.4GHz signal passes through the first band-pass filter 7 after varactor doubler 6 frequencys multiplication, the first bandpass filter 7 centre frequency 60.8GHz, bandwidth 2GHz, in order to extract the radiofrequency signal of 60.8GHz, launched by antenna 9 after finally improving emissive power by the second power amplifier 8; The 3rd frequency band signals, be that 38GHz signal is through the first driving amplifier 10 amplifying signal power, after varactor doubler 11 frequencys multiplication, pass through the second band-pass filter 12, the second bandpass filter 12 centre frequency 76GHz, bandwidth 2GHz, in order to extract the radiofrequency signal of 76GHz, launched by antenna 14 after finally improving emissive power by the 3rd power amplifier 13.Three road signals are launched simultaneously, so can select and arrange in pairs or groups according to the transmitting range of corresponding application band and desired signal.
The first frequency multiplier 2 in embodiment adopts the monolithic quadruple chip of UMS company, and incoming frequency scope is 6.25-8.25GHz, and after quadruple, reference frequency output is 25-33GHz.When input signal adopts 7.6GHz, when power 12dBm signal, output terminal can obtain a 30.4GHz, the signal of power 11dBm.The second frequency multiplier 6 adopts the monolithic two frequency multiplication chips of UMS company, incoming frequency scope 27-33GHz, reference frequency output 54-66GHz after two frequencys multiplication.When input signal adopts 30.8GHz, when power 12dBm signal, output terminal can obtain a 60.8GHz, the signal of power 11dBm.Frequency tripler 11 adopts the W wave band monolithic two frequency multiplication chips of UMS company, incoming frequency scope 38-38.5GHz, reference frequency output 76-77GHz after two frequencys multiplication.When input signal adopts 38GHz, when power 5dBm signal, output terminal can obtain a 76GHz, the signal of power 13dBm.Above frequency multiplier all, in order to produce the signal after corresponding frequency multiplication, reduces the frequency of signal source, improves frequency stability;
The first bandpass filter 7 in embodiment and the second bandpass filter 12 make the interconnection between bandpass filter and chip more stable and convenient.The first bandpass filter is operated in 60.8GHz, and bandwidth 2GHz, for extracting the signal of 60.8GHz, filtering each harmonic and clutter; The second bandpass filter is operated in 76GHz, bandwidth 2GHz, and for extracting 76GHz signal, the unwanted each harmonic of filtering and clutter.Multiband bandpass filter 3, for extracting frequency tripling, quadruple, five frequency-doubled signals, offers late-class circuit and uses.Above bandpass filter all utilizes Advanced Design System and HFSS to carry out electromagnetic-field simulation to approach actual performance.
In embodiment, the first power amplifier 4 and the first driving amplifier 10 adopt the level Four GaAs power amplifier chip of UMS company, this level Four power amplifier frequency of operation is at 20-40GHz, gain 22dB, saturation output power 20dBm, there is good input Broadband Matching, for improving three times of signals and the five times of signal powers after frequency multiplication.The second power amplifier 8 adopts the level Four GaAs power amplifier of Hittite company, and this level Four power amplifier is operated in 50-66GHz, gain 24dB, and output 1dB compression horsepower 17dBm, for improving the emissive power of the second tunnel radiofrequency signal.The 3rd power amplifier 13 adopts the level Four GaAs power amplifier of Hittite company, and this level Four power amplifier is operated in 71-86GHz, gain 15dB, and output 1dB compression horsepower 15dBm, for improving the emissive power of Third Road radiofrequency signal.
Above content is the detailed description of the present invention being done in conjunction with concrete case study on implementation, can not assert that the concrete enforcement of the present invention only limits to these explanations.For those skilled in the art of the present invention; without departing from the inventive concept of the premise; to each building block of the present invention, position relationship and connected mode, in the situation that not changing its function, the equivalent transformation carrying out or alternative, also falls into protection scope of the present invention.
Claims (5)
1. a multiband borne Millimeter Wave Collision Avoidance Radars signal source, comprises multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit and metal shielding box; Multiband borne Millimeter Wave Collision Avoidance Radars signal source circuit is fixedly assembled in metal shielding box;
It is characterized in that: described borne Millimeter Wave Collision Avoidance Radars signal source circuit comprises the first frequency multiplier, multiband bandpass filter, the first power amplifier, the second frequency multiplier, the first bandpass filter, the second power amplifier, the first driving amplifier, frequency tripler, the second bandpass filter, the 3rd power amplifier, the first antenna, the second antenna and third antenna;
The first frequency multiplier connects a microwave signal source by microwave connector, output terminal is connected with the input end of multiband bandpass filter, the first frequency range output terminal of multiband bandpass filter is connected with the input end of the first power amplifier, and the output terminal of the first power amplifier connects the first antenna by the first millimeter-wave signal interface; The second frequency range output terminal of multiband bandpass filter is connected with the input end of the second frequency multiplier, the output terminal of the second frequency multiplier is connected with one end of the first bandpass filter, the other end of the first bandpass filter is connected with the input end of the second power amplifier, and the output terminal of the second power amplifier connects the second antenna by the second millimeter-wave signal interface; The 3rd frequency range output terminal of multiband bandpass filter is connected with the input end of the first driving amplifier, the output terminal of the first driving amplifier is connected with the input end of frequency tripler, the output terminal of frequency tripler is connected with one end of the second bandpass filter, the second bandpass filter other end is connected with the 3rd power amplifier, and the output terminal of the 3rd power amplifier connects third antenna by the 3rd millimeter-wave signal interface.
2. a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source according to claim 1, it is characterized in that: the first described bandpass filter is identical with the second bandpass filter structures, it is the microstrip coupled structure of zigzag, comprises two 50 ohm microstrip, six roots of sensation parallel coupled line and five coupling line connecting lines;
Six roots of sensation parallel coupled line indentation is arranged, and by the line serial connection that is of coupled connections, wherein first is connected with 50 ohm microstrip respectively by transition line with last root parallel coupled line.
3. a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source according to claim 1, is characterized in that: the first described frequency multiplier adopts quadruple monolithic integrated circuit, and the second frequency multiplier and frequency tripler adopt two frequency multiplication monolithic integrated circuits.
4. a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source according to claim 1, is characterized in that: described microwave connector adopts SMA coaxial connector; The first millimeter-wave signal interface adopts 2.92mm coaxial connector or the micro-band-waveguide connector of WR28, the second millimeter-wave signal interface adopts 1.85mm coaxial connector or the micro-band-waveguide connector of WR15, and the 3rd millimeter-wave signal interface adopts 1mm coaxial connector or the micro-band-waveguide connector of WR10.
5. a kind of multiband borne Millimeter Wave Collision Avoidance Radars signal source according to claim 1, is characterized in that: described metal shielding box is processed by brass.
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| CN201410280425.2A CN104101867B (en) | 2014-06-20 | 2014-06-20 | Multi band millimeter wave anticollision radar signal source |
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| CN201410280425.2A CN104101867B (en) | 2014-06-20 | 2014-06-20 | Multi band millimeter wave anticollision radar signal source |
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| CN104101867B CN104101867B (en) | 2017-01-11 |
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| TWI580211B (en) * | 2014-10-31 | 2017-04-21 | 西凱渥資訊處理科技公司 | Diversity receiver front end system with post-amplifier filters |
| US9667324B2 (en) | 2014-10-31 | 2017-05-30 | Skyworks Solutions, Inc. | Diversity receiver front end system with amplifier phase compensation |
| US9838056B2 (en) | 2015-05-28 | 2017-12-05 | Skyworks Solutions, Inc. | Integrous signal combiner |
| US9893752B2 (en) | 2014-10-31 | 2018-02-13 | Skyworks Solutions, Inc. | Diversity receiver front end system with variable-gain amplifiers |
| US10050694B2 (en) | 2014-10-31 | 2018-08-14 | Skyworks Solution, Inc. | Diversity receiver front end system with post-amplifier filters |
| CN108551348A (en) * | 2018-01-26 | 2018-09-18 | 合肥驼峰电子科技发展有限公司 | A kind of multiband mm-wave signal source |
| CN108551349A (en) * | 2018-01-26 | 2018-09-18 | 合肥驼峰电子科技发展有限公司 | A kind of multiband millimeter-wave transmitter |
| CN113325417A (en) * | 2021-05-24 | 2021-08-31 | 西安空间无线电技术研究所 | Millimeter wave and terahertz multi-band radar detection imaging system and method |
| US11901601B2 (en) | 2020-12-18 | 2024-02-13 | Aptiv Technologies Limited | Waveguide with a zigzag for suppressing grating lobes |
| US11949145B2 (en) | 2021-08-03 | 2024-04-02 | Aptiv Technologies AG | Transition formed of LTCC material and having stubs that match input impedances between a single-ended port and differential ports |
| US11962085B2 (en) | 2021-05-13 | 2024-04-16 | Aptiv Technologies AG | Two-part folded waveguide having a sinusoidal shape channel including horn shape radiating slots formed therein which are spaced apart by one-half wavelength |
| US12058804B2 (en) | 2021-02-09 | 2024-08-06 | Aptiv Technologies AG | Formed waveguide antennas of a radar assembly |
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| US10050694B2 (en) | 2014-10-31 | 2018-08-14 | Skyworks Solution, Inc. | Diversity receiver front end system with post-amplifier filters |
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| US11901601B2 (en) | 2020-12-18 | 2024-02-13 | Aptiv Technologies Limited | Waveguide with a zigzag for suppressing grating lobes |
| US12058804B2 (en) | 2021-02-09 | 2024-08-06 | Aptiv Technologies AG | Formed waveguide antennas of a radar assembly |
| US11962085B2 (en) | 2021-05-13 | 2024-04-16 | Aptiv Technologies AG | Two-part folded waveguide having a sinusoidal shape channel including horn shape radiating slots formed therein which are spaced apart by one-half wavelength |
| CN113325417A (en) * | 2021-05-24 | 2021-08-31 | 西安空间无线电技术研究所 | Millimeter wave and terahertz multi-band radar detection imaging system and method |
| CN113325417B (en) * | 2021-05-24 | 2024-03-15 | 西安空间无线电技术研究所 | Millimeter wave and terahertz multi-band radar detection imaging system and method |
| US11949145B2 (en) | 2021-08-03 | 2024-04-02 | Aptiv Technologies AG | Transition formed of LTCC material and having stubs that match input impedances between a single-ended port and differential ports |
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