CN217768771U - High-isolation and broadband millimeter wave radar transmitter leakage canceller - Google Patents
High-isolation and broadband millimeter wave radar transmitter leakage canceller Download PDFInfo
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- CN217768771U CN217768771U CN202221865919.3U CN202221865919U CN217768771U CN 217768771 U CN217768771 U CN 217768771U CN 202221865919 U CN202221865919 U CN 202221865919U CN 217768771 U CN217768771 U CN 217768771U
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Abstract
The utility model discloses a millimeter wave radar transmitter of high isolation and broadband reveals canceller, including transmitting terminal circulator, receiving terminal circulator, first hybrid coupler, second hybrid coupler, first both ends feed microstrip antenna and second both ends feed microstrip antenna. The utility model discloses a millimeter wave radar transmitter of high isolation and broadband reveals canceller, it is through the transmitting terminal circulator, the receiving terminal circulator, first hybrid coupler, the second hybrid coupler, first both ends feed microstrip antenna and second both ends feed microstrip antenna further realize wide bandwidth and high isolation, when signal reception, do not receive the influence of antenna end impedance matching condition, because the reflection of antenna and hybrid coupler reveal can offset each other at the receiving terminal, as long as two way symmetries, the isolation will be very stable.
Description
Technical Field
The utility model belongs to the technical field of radar transmitter, concretely relates to millimeter wave radar transmitter of high isolation and broadband reveals canceller.
Background
With the rapid development of scientific technology, millimeter wave short-range radars are widely used in many fields, for example: automatic sensors, medicine and autopilot. Among them, the continuous wave radar, especially the linear frequency modulation radar and the doppler radar, is widely used in the scientific, industrial and medical fields because of its own advantages such as simple structure and low cost.
The chirp radar and the doppler radar are mainly composed of a transmitter, a transmitting antenna, a receiving antenna and a receiver, and a single-antenna radar is developed to reduce the size and the cost of a product, but the working frequencies of the transmitter and the receiver are consistent, so that a duplexer cannot be used, and further, leakage between the transmitter and the receiver is called as an important limiting factor influencing the sensitivity of the receiver.
The traditional approach to suppressing transmitter leakage is mainly through the use of 90 ° hybrid couplers, circulators and microstrip couplers, and combinations of these devices, with relatively high isolation with good matching. However, in practical applications, the isolation is deteriorated because the matching at the antenna end cannot achieve very good matching within a wide bandwidth, and the isolation of these commercial devices is generally about 25 dB.
Therefore, the above problems are further improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides millimeter wave radar transmitter of high isolation and broadband reveals canceller, it passes through the transmitting terminal circulator, the receiving terminal circulator, first hybrid coupler, the second hybrid coupler, first both ends feed microstrip antenna and second both ends feed microstrip antenna further realize wide bandwidth and high isolation, when signal transmission, do not receive the influence of antenna end impedance matching condition, because the reflection of antenna and hybrid coupler (transmitter) reveal can offset each other at the receiving terminal, as long as two way symmetries, the isolation will be very stable.
Another object of the utility model is to provide a millimeter wave radar transmitter of high isolation and broadband reveals the canceller, when signal reception, the signal gets into by the antenna array, is received by first both ends feed microstrip antenna and second both ends feed microstrip antenna respectively, then transmits the receiving terminal circulator through the hybrid coupler who is connected with it respectively, because two way signals are in phase, superposes each other at the receiving terminal, realizes the reinforcing of signal and receives.
In order to achieve the above object, the utility model provides a millimeter wave radar transmitter of high isolation and broadband reveals canceller, including transmitting end circulator, receiving end circulator, first hybrid coupler, second hybrid coupler, first both ends feed microstrip antenna and second both ends feed microstrip antenna, wherein:
the first end of the transmitting end circulator is connected with a transmitting end and the transmitting end is used for inputting signals, and the first end of the receiving end circulator is connected with a receiving end and the receiving end is used for receiving signals;
a second end of the transmit end circulator is electrically connected to a first end of the first hybrid coupler and a second end of the receive end circulator is electrically connected to a second end of the first hybrid coupler, a third end of the first hybrid coupler is electrically connected to a first end of the first dual-fed microstrip antenna and a fourth end of the first hybrid coupler is electrically connected to a second end of the first dual-fed microstrip antenna;
the third end of the transmitting end circulator is electrically connected to the first end of the second hybrid coupler and the third end of the receiving end circulator is electrically connected to the second end of the second hybrid coupler, the third end of the second hybrid coupler is electrically connected to the first end of the second dual-end fed microstrip antenna and the fourth end of the second hybrid coupler is electrically connected to the second end of the second dual-end fed microstrip antenna.
As a further preferable technical solution of the above technical solution, the third end of the first hybrid coupler is electrically connected to the first end of the first dual-fed microstrip antenna through a first impedance changer, and the fourth end of the first hybrid coupler is electrically connected to the second end of the first dual-fed microstrip antenna through a second impedance changer.
As a further preferable technical solution of the above technical solution, the third end of the second hybrid coupler is electrically connected to the first end of the second dual-end fed microstrip antenna through a third impedance changer, and the fourth end of the second hybrid coupler is electrically connected to the second end of the second dual-end fed microstrip antenna through a fourth impedance changer.
As a further preferable technical solution of the above technical solution, the fourth terminal of the transmitting end circulator is connected to a first load and the fourth terminal of the receiving end circulator is connected to a second load.
As a further preferable technical solution of the above technical solution, the transmitting end circulator and the receiving end circulator are both 180 ° circulators, and the first hybrid coupler and the second hybrid coupler are both 90 ° couplers.
In a further preferred embodiment of the above-mentioned technical solution, a signal generated at the third terminal of the first hybrid coupler and a signal generated at the fourth terminal are in equal-amplitude quadrature, and a signal generated at the third terminal of the second hybrid coupler and a signal generated at the fourth terminal are in equal-amplitude quadrature.
As a further preferable aspect of the above technical solution, the first double-end-fed microstrip antenna and the second double-end-fed microstrip antenna constitute an antenna array and the antenna array is used for transmitting and receiving electromagnetic waves.
Drawings
Fig. 1 is the schematic structural diagram of the millimeter wave radar transmitter leakage canceller with high isolation and broadband according to the present invention.
The reference numerals include: 1. a transmitting end; 2. a receiving end; 3. a transmitting end circulator; 4. a receiving end circulator; 5. a first hybrid coupler; 6. a second hybrid coupler; 7. a first dual-fed microstrip antenna; 8. a second dual-fed microstrip antenna; 9. a first impedance changer; 10. a second impedance changer; 11. a third impedance changer; 12. a fourth impedance changer; 13. a first load; 14. a second load.
Detailed Description
The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
The utility model discloses a millimeter wave radar transmitter of high isolation and broadband reveals the canceller, combines preferred embodiment below, makes further description to utility model's specific embodiment.
In the embodiments of the present invention, those skilled in the art will note that the radar, the transmitting end, the receiving end, and the like of the present invention can be regarded as the prior art.
Preferred embodiments.
The utility model provides a millimeter wave radar transmitter of high isolation and broadband reveals canceller, including transmitting terminal circulator 3, receiving terminal circulator 4, first hybrid coupler 5, second hybrid coupler 6, first both ends feed microstrip antenna 7 and second both ends feed microstrip antenna 8, wherein:
the first end of the transmitting end circulator 3 is connected with a transmitting end 1, the transmitting end 1 is used for inputting signals, the first end of the receiving end circulator 4 is connected with a receiving end 2, and the receiving end 2 is used for receiving signals;
the second end of the transmitting-side circulator 3 is electrically connected to the first end of the first hybrid coupler 5, the second end of the receiving-side circulator 4 is electrically connected to the second end of the first hybrid coupler 5, the third end of the first hybrid coupler 5 is electrically connected to the first end of the first dual-fed microstrip antenna 7, and the fourth end of the first hybrid coupler 5 is electrically connected to the second end of the first dual-fed microstrip antenna 7;
the third terminal of the transmitting-side circulator 3 is electrically connected to the first terminal of the second hybrid coupler 6, the third terminal of the receiving-side circulator 4 is electrically connected to the second terminal of the second hybrid coupler 6, the third terminal of the second hybrid coupler 6 is electrically connected to the first terminal of the second dual-fed microstrip antenna 8, and the fourth terminal of the second hybrid coupler 6 is electrically connected to the second terminal of the second dual-fed microstrip antenna 8.
Specifically, the third end of the first hybrid coupler 5 is electrically connected to the first end of the first dual-end fed microstrip antenna 7 through a first impedance transformer 9, and the fourth end of the first hybrid coupler 8 is electrically connected to the second end of the first dual-end fed microstrip antenna 7 through a second impedance transformer 8.
More specifically, the third end of the second hybrid coupler 6 is electrically connected to the first end of the second dual-end fed microstrip antenna 8 through a third impedance transformer 11, and the fourth end of the second hybrid coupler 6 is electrically connected to the second end of the second dual-end fed microstrip antenna 8 through a fourth impedance transformer 12.
Further, the fourth end of the transmitting end circulator 3 is connected to a first load 13 and the fourth end of the receiving end circulator 4 is connected to a second load 14.
Further, the transmitting-side circulator 3 and the receiving-side circulator 4 are both 180 ° circulators, and the first hybrid coupler 5 and the second hybrid coupler 6 are both 90 ° couplers.
Preferably, the signal generated at the third terminal of the first hybrid coupler 5 and the signal generated at the fourth terminal are in equal amplitude quadrature, and the signal generated at the third terminal of the second hybrid coupler 6 and the signal generated at the fourth terminal are in equal amplitude quadrature.
Preferably, the first and second double- fed microstrip antennas 7 and 8 constitute an antenna array and the antenna array is used for transmitting and receiving electromagnetic waves.
The principle of the utility model is as shown in figure 1:
transmit (signal cancellation):
the signal is by the transmission end input (connect the transmitter), through 180 transmission end circulator, produces two routes of constant amplitude phase reversal signals, and one route gets into 90 first hybrid coupler on upper portion, and then produces two routes of constant amplitude quadrature (signal phase difference 90 °) signals: signals 1 and 2 are input into the first double-fed microstrip antenna at the upper portion.
The other path enters a 90-degree second hybrid coupler at the lower part to generate two paths of constant-amplitude orthogonal signals: signals 3 and 4, are input into the lower second double-fed microstrip antenna.
Due to the 180 ° circulator, signals 1 and 3, and signals 2 and 4, respectively, are 180 ° out of phase, with the specific phases shown in fig. 1 (angle without brackets).
And the upper and lower double-end feed microstrip antennas form a 2-by-1 antenna array and emit electromagnetic waves.
Meanwhile, the output (the first leakage signal and the second leakage signal) of the isolation end of each 90-degree hybrid coupler and the (first and second) reflected signals caused by mismatching of the antenna ends can be cancelled out at the receiving end circulator due to consistent paths and opposite phases, and high isolation is further realized. Meanwhile, regardless of how the impedance of the antenna is matched and changed, as long as the upper path and the lower path are kept symmetrical, the reflected signals of the two paths can be mutually offset at the receiving end (otherwise, the signal receiving of a receiver connected with the receiving end can be influenced).
It should be noted that the impedance change refers to the input impedance of the whole antenna, that is, the impedance transformer + the dual-fed microstrip antenna, and the impedance of the two antennas, and the two ends of the first or second hybrid coupler are connected to the two ends of the dual-fed microstrip antenna, so as to implement circular polarization. Cancellation means that a signal reflected by the first dual-end fed microstrip antenna and a reflected signal of the second dual-end fed microstrip antenna are cancelled at the receiving end finally due to the fact that the first dual-end fed microstrip antenna, the second dual-end fed microstrip antenna and a transmission path are consistent, and the additional phase inversion effect of the circulator at the receiving end is added. The same leakage signal of the coupler is obtained, the receiving end circulator gives an inverse effect, and the path is consistent, so that cancellation is realized
Reception (signal superposition):
as shown in fig. 1 (angle in parentheses), signals enter from the antenna array, are received by the first dual-feed microstrip antenna and the second dual-feed microstrip antenna respectively, and are then transmitted to the receiving end circulator (the transmitting end is closed at this time) through the hybrid coupler connected with the first dual-feed microstrip antenna and the second dual-feed microstrip antenna respectively.
Preferably, the first and second liquid crystal display panels are,
this structure uses double-deck PCB processing, panel: rogers4350, thickness 0.254mm;
the upper and lower layers are made of metal, and the structure of the upper layer is shown in figure 1.
180 ° launch end circulator: generating two paths of signals with the same power and opposite phases;
180 ° receiving end circulator: generating two paths of same-power and same-phase signals;
90 ° hybrid coupler: generating two paths of orthogonal signals with the same power;
first/second double-fed microstrip antenna: signal transmission and reception (circular polarization);
50ohm load (first load and second load): absorbing the load.
It is worth mentioning that the technical features such as the radar, the transmitting terminal and the receiving terminal that the patent application relates to should be regarded as prior art, and the concrete structure, the theory of operation and the control mode that may involve, the spatial arrangement mode of these technical features adopt the conventional selection in this field can, should not be regarded as the utility model discloses an invention point is located, the utility model discloses a do not do further specifically expand the detailed description.
It will be apparent to those skilled in the art that modifications and variations can be made in the above-described embodiments, or some features of the invention may be substituted or omitted, and any modification, substitution, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a millimeter wave radar transmitter of high isolation and broadband leaks and cancels ware which characterized in that, includes transmitting end circulator, receiving end circulator, first hybrid coupler, second hybrid coupler, first both ends feed microstrip antenna and second both ends feed microstrip antenna, wherein:
the first end of the transmitting end circulator is connected with a transmitting end and the transmitting end is used for inputting signals, and the first end of the receiving end circulator is connected with a receiving end and the receiving end is used for receiving signals;
a second end of the transmit end circulator is electrically connected to a first end of the first hybrid coupler and a second end of the receive end circulator is electrically connected to a second end of the first hybrid coupler, a third end of the first hybrid coupler is electrically connected to a first end of the first dual-fed microstrip antenna and a fourth end of the first hybrid coupler is electrically connected to a second end of the first dual-fed microstrip antenna;
the third end of the transmitting-side circulator is electrically connected to the first end of the second hybrid coupler and the third end of the receiving-side circulator is electrically connected to the second end of the second hybrid coupler, the third end of the second hybrid coupler is electrically connected to the first end of the second dual-end fed microstrip antenna and the fourth end of the second hybrid coupler is electrically connected to the second end of the second dual-end fed microstrip antenna.
2. The high-isolation and broadband millimeter-wave radar transmitter leakage canceller of claim 1, wherein a third end of the first hybrid coupler is electrically connected to a first end of the first dual-fed microstrip antenna through a first impedance transformer and a fourth end of the first hybrid coupler is electrically connected to a second end of the first dual-fed microstrip antenna through a second impedance transformer.
3. The high-isolation and broadband millimeter-wave radar transmitter leakage canceller of claim 2, wherein a third end of the second hybrid coupler is electrically connected to a first end of the second dual-fed microstrip antenna through a third impedance transformer and a fourth end of the second hybrid coupler is electrically connected to a second end of the second dual-fed microstrip antenna through a fourth impedance transformer.
4. The high isolation and broadband millimeter wave radar transmitter leakage canceller of claim 3, wherein a fourth end of the transmit side circulator is connected to a first load and a fourth end of the receive side circulator is connected to a second load.
5. The high-isolation and broadband millimeter wave radar transmitter leakage canceller of claim 4, wherein the transmitting end circulator and the receiving end circulator are both 180 ° circulators, and the first hybrid coupler and the second hybrid coupler are both 90 ° couplers.
6. The high isolation and wide band millimeter wave radar transmitter leakage canceller of claim 5, wherein the signal generated at the third terminal of the first hybrid coupler is in equal amplitude quadrature with the signal generated at the fourth terminal, and the signal generated at the third terminal of the second hybrid coupler is in equal amplitude quadrature with the signal generated at the fourth terminal.
7. The high isolation, broadband millimeter wave radar transmitter leakage canceller of claim 6, wherein the first double-fed microstrip antenna and the second double-fed microstrip antenna form an antenna array and the antenna array is used for transmitting and receiving electromagnetic waves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221865919.3U CN217768771U (en) | 2022-07-19 | 2022-07-19 | High-isolation and broadband millimeter wave radar transmitter leakage canceller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221865919.3U CN217768771U (en) | 2022-07-19 | 2022-07-19 | High-isolation and broadband millimeter wave radar transmitter leakage canceller |
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| CN217768771U true CN217768771U (en) | 2022-11-08 |
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| CN202221865919.3U Active CN217768771U (en) | 2022-07-19 | 2022-07-19 | High-isolation and broadband millimeter wave radar transmitter leakage canceller |
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Address after: No. 0459, Unit 209, No. 62 Chengyi North Street, Software Park Phase III, Torch High tech Zone, Xiamen City, Fujian Province, 361000 Patentee after: Sijie Microelectronics (Xiamen) Co.,Ltd. Address before: 201800 room j461, building 6, 1288 Yecheng Road, Jiading District, Shanghai Patentee before: SHANGHAI SILICON MICROELECTRONICS Co.,Ltd. |
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