TWM640848U - Radar signal device - Google Patents

Abstract

A radar signal device includes an antenna unit, a transmission circuit and a reception circuit. The antenna unit is used to concurrently transmit a transmission signal and receive a reception signal. The antenna unit includes a metal layer, a first feed structure and a second feed structure. An opening is formed on the metal layer. A first projection of the first feed structure on the metal layer at least partially overlaps with the opening. A second projection of the second feed structure on the metal layer at least partially overlaps with the opening. The antenna unit forms a first radiation pattern used to transmit the transmission signal and a second radiation pattern used to receive the reception signal. An angle between a co-polarization electric field direction of the first radiation pattern and a co-polarization electric field direction of the second radiation pattern is between 45 degrees and 135 degrees. The first and second radiation patterns form a first and a second bi-directional radiation pattern via the opening respectively.

Description

radar signal device

The invention relates to a radar signal device, especially a radar signal device comprising a metal layer and a feed structure, and the projection of the feed structure at least partially overlaps the opening of the metal layer.

As the demands related to communication increase day by day, the requirements for antenna-related devices also increase accordingly. According to the current technology, to realize the antenna device with high isolation, it is often necessary to use an antenna array. Therefore, it will be necessary to face problems such as a large number of components, difficulty in reducing the area, difficulty in using circuit boards (such as printed circuit boards) and high cost. .

In addition, according to current technology, patch antennas can be used for signal transmission and reception, but this can only achieve a unidirectional radiation pattern, resulting in limited detection range and application scenarios, and components such as couplers must be installed to process signals. Therefore, it is difficult to simplify the antenna structure and improve the antenna performance.

The embodiment provides a radar signal device, which includes an antenna unit, a transmitting circuit and a receiving circuit. The antenna unit is used for simultaneously transmitting a transmitting signal and receiving a receiving signal within a period of time. The antenna unit includes a first metal layer, a first feeding structure and a second feeding structure. An opening is formed in the first metal layer, and the opening passes through the first metal layer. A first orthographic projection of the first feeding structure on the first metal layer at least partially overlaps the opening, the first feeding structure is used to receive a first internal signal, and the transmitting signal is based on at least the first generated by an internal signal. A second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the opening, the second feed structure is used to output a second internal signal, and the second internal signal is based on the Generated by receiving a signal. The transmitting circuit is used for generating the first internal signal. The receiving circuit is used to generate a processing signal, wherein the processing signal is related to the second internal signal. The antenna unit is used to generate a first radiation field type and a second radiation field type, the first radiation field type is used to transmit the transmission signal and has a first common polarization electric field direction, and the second radiation field type is used for to receive the received signal and have a second co-polarization electric field direction. There is an included angle between the first co-polarized electric field direction and the second co-polarized electric field direction, and the included angle is greater than or equal to 45 degrees and less than or equal to 135 degrees. The first opening is used to form the first radiation pattern into a first bidirectional radiation pattern, and to make the second radiation pattern into a second bidirectional radiation pattern.

Another embodiment provides a radar signal device, including an antenna unit, a transmitting circuit, and a receiving circuit. The antenna unit is used for simultaneously transmitting a transmitting signal and receiving a receiving signal within a period of time. The antenna unit includes a first metal layer, a first feed structure, a second feed structure and a reflection plate. An opening is formed in the first metal layer, and the opening passes through the first metal layer. A first orthographic projection of the first feeding structure on the first metal layer at least partially overlaps the opening, the first feeding structure is used to receive a first internal signal, and the transmitting signal is based on at least the first generated by an internal signal. A second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the opening, the second feed structure is used to output a second internal signal, and the second internal signal is based on the Generated by receiving a signal. The distance between the reflecting plate and the first metal layer is greater than or equal to 0.1 air wavelength and less than or equal to 1 air wavelength. The transmitting circuit is used for generating the first internal signal. The receiving circuit is used for generating a processing signal, and the processing signal is related to the second internal signal. The antenna unit is used to generate a first radiation field type and a second radiation field type, the first radiation field type is used to transmit the transmission signal and has a first common polarization electric field direction, and the second radiation field type is used for to receive the received signal and have a second co-polarization electric field direction. There is an included angle between the first co-polarized electric field direction and the second co-polarized electric field direction, and the included angle is greater than or equal to 45 degrees and less than or equal to 135 degrees. The reflecting plate is used to make the first radiation pattern form a first one-way radiation pattern, and to make the second radiation pattern form a second one-way radiation pattern.

Another embodiment provides a radar signal device, including an antenna unit, a transmitting circuit, and a receiving circuit. The antenna unit is used for simultaneously transmitting a transmitting signal and receiving a receiving signal within a period of time. The antenna unit includes a first metal layer, a first feeding structure and a second feeding structure. An opening is formed in the first metal layer, and the opening passes through the first metal layer. A first orthographic projection of the first feeding structure on the first metal layer at least partially overlaps the opening, the first feeding structure is used to receive a first internal signal, and the transmitting signal is based on at least the first generated by an internal signal. A second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the opening, the second feed structure is used to output a second internal signal, and the second internal signal is based on the Generated by receiving a signal. The transmitting circuit is used for generating the first internal signal. The receiving circuit is used to generate a processing signal, wherein the processing signal is related to the second internal signal. A first reference line passes through a first feed point of the first feed structure and a central point of the opening, a second reference line passes through a second feed point of the second feed structure and a center point of the opening The center point, an included angle between the first reference line and the second reference line is between 45 degrees and 135 degrees. The antenna unit is used to generate a first radiation pattern and a second radiation pattern, the first radiation pattern is used to transmit the transmission signal, and the second radiation pattern is used to receive the reception signal. The first opening is used to form the first radiation pattern into a first bidirectional radiation pattern, and to make the second radiation pattern into a second bidirectional radiation pattern.

Another embodiment provides a radar signal device including an antenna unit, a transmitting circuit and a receiving circuit. The antenna unit is used for simultaneously transmitting a transmitting signal and receiving a receiving signal within a period of time. The antenna unit includes a first metal layer, a first feed structure, a second feed structure and a reflection plate. An opening is formed in the first metal layer, and the opening passes through the first metal layer. A first orthographic projection of the first feeding structure on the first metal layer at least partially overlaps the opening, the first feeding structure is used to receive a first internal signal, and the transmitting signal is based on at least the first generated by an internal signal. A second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the opening, the second feed structure is used to output a second internal signal, and the second internal signal is based on the Generated by receiving a signal. The distance between the reflecting plate and the first metal layer is greater than or equal to 0.1 air wavelength and less than or equal to 1 air wavelength. The transmitting circuit is used for generating the first internal signal. The receiving circuit is used to generate a processing signal, wherein the processing signal is related to the second internal signal. A first reference line passes through a first feed point of the first feed structure and a central point of the opening, a second reference line passes through a second feed point of the second feed structure and a center point of the opening The center point, an included angle between the first reference line and the second reference line is between 45 degrees and 135 degrees. The antenna unit is used to generate a first radiation pattern and a second radiation pattern, the first radiation pattern is used to transmit the transmission signal, and the second radiation pattern is used to receive the reception signal. The reflecting plate is used to make the first radiation pattern form a first one-way radiation pattern, and to make the second radiation pattern form a second one-way radiation pattern

FIG. 1 is a schematic diagram of a radar signal device 100 in an embodiment. The radar signal device 100 may include an antenna unit 110 , a transmitting circuit 120 and a receiving circuit 130 . In FIG. 1 , the antenna unit 110 is a top view, and the transmitting circuit 120 and the receiving circuit 130 are schematic block diagrams, rather than depicting actual sizes and proportions. In FIG. 1 , the antenna unit 110 can be used to simultaneously transmit a transmit signal ST and receive a receive signal SR within a period of time. The transmitting signal ST and the receiving signal SR can be wireless signals. The antenna unit 110 includes a first metal layer 115 , a first feeding structure 111 and a second feeding structure 112 . The first opening 118 is formed in the first metal layer 115 , and the first opening 118 penetrates through the first metal layer 115 . Each of the first feed structure 111 and the second feed structure 112 may be formed on the first metal layer 115 to be coplanar with the first metal layer 115 . In another embodiment, each of the first feed structure 111 and the second feed structure 112 may be formed on another metal layer different from the first metal layer 115 and not coplanar with the first metal layer 115 . According to an embodiment, the first metal layer 115 may be a ground terminal having a reference potential (for example, 0 volts).

If the first feeding structure 111 and the second feeding structure 112 are not coplanar with the first metal layer 115, the first internal signal S1 can be transmitted between the first feeding structure 111 and the transmitting circuit 120 through a transmission line, and the second The second internal signal S2 can be transmitted between the two feeding structures 112 and the receiving circuit 130 through a transmission line. The transmission line includes, for example, a microstrip line (microstrip), an external wire, a coplanar waveguide (CPW), its modified grounded coplanar waveguide (Grounded CPW), or other types that can be connected between the first feed structure 111 and the second feed structure. The structure between 112 and the first metal layer 115 realizes the transmission line, wherein the microstrip line and the coplanar waveguide can be formed on the conductive layer of the printed circuit board.

In another embodiment, if the first feeding structure 111 and the second feeding structure 112 are coplanar with the first metal layer 115, the transmission between the first feeding structure 111 and the transmitting circuit 120 can be carried out through a coplanar waveguide. The first internal signal S1, and the second internal signal S2 can be transmitted between the second feeding structure 112 and the receiving circuit 130 through the coplanar waveguide.

The first orthographic projection of the first feed structure 111 on the first metal layer 115 may at least partially overlap with the first opening 118 . The first feeding structure 111 can be used to receive the first internal signal S1, and the transmit signal ST can be generated according to at least the first internal signal S1. The second orthographic projection of the second feed structure 112 on the first metal layer 115 may at least partially overlap the first opening 118, the second feed structure 112 may be used to output the second internal signal S2, and the second internal signal S2 may be Generated according to the received signal SR. The transmitting circuit 120 can be used to generate the first internal signal S1. The receiving circuit 130 can be used to generate the processed signal SP, wherein the processed signal SP can be related to the second internal signal S2.

In one embodiment, an input signal (not shown in the figure) can be input to the transmitting circuit 120 to generate the first internal signal S1, and the radar signal device 100 can further include a processing unit (not shown in the figure), and the processing unit is coupled to The transmitting circuit 120 and the receiving circuit 130 are used for generating spatial information of the object according to the processed signal SP and the input signal. For example, within a period of time, the transmitting signal ST can be continuously transmitted, and the receiving signal SR can be continuously received at this time, and the frequency of the transmitting signal ST and the frequency of the receiving signal SR correspond to the frequency of the input signal and the frequency of the processing signal SP respectively . When an object moves, a frequency shift can be generated according to the Doppler effect. Therefore, the processing unit can determine whether the object is moving according to the frequency difference between the transmitted signal ST and the received signal SR (corresponding to the frequency difference between the input signal and the processed signal SP). When the frequency difference between the transmitting signal ST and the receiving signal SR is substantially zero, it can be determined that the object is fixed.

The antenna unit 110 can be used to generate a first radiation pattern and a second radiation pattern. The first radiation pattern can be used to transmit a transmission signal ST and has a first co-polarized electric field direction E1. The second radiation pattern can be used to receive The signal SR is received and has a second co-polarized electric field direction E2. An angle θ1 is formed between the first common polarization electric field direction E1 and the second common polarization electric field direction E2. The included angle θ1 may be greater than or equal to 45 degrees and less than or equal to 135 degrees, that is, 45° ≤ θ1 ≤ 135°. For example, the first co-polarization electric field direction E1 in the first radiation pattern may be orthogonal to the second co-polarization electric field direction E2 in the second radiation pattern, that is, the included angle θ1 may be substantially 90 degrees.

The first opening 118 can make the first radiation pattern form a first bidirectional radiation field pattern, and can make the second radiation field pattern form a second bidirectional radiation field pattern. The direction of the plane formed by d2) and the direction entering the paper. As mentioned above, using the radar signal device 100 in Fig. 1, since the included angle θ1 between the direction of the first co-polarized electric field and the direction of the second co-polarized electric field falls within the range of 45 degrees to 135 degrees, the transmitted signal There is sufficient isolation between the ST and the receiving signal SR, and a bidirectional radiation pattern can be generated through the first opening 118 to improve the performance of sending and receiving signals.

As shown in FIG. 1 , each of the first feed structure 111 and the second feed structure 112 can be an adjusted tuning fork-shaped structure, and the arms of the tuning fork-shaped structure (for example, arm 111A and arm 112A ) can be curved. However, this is only an example, and the embodiment is not limited thereto. The arm portions 111A and 112A in FIG. 1 are curved to prevent the first feeding structure 111 and the second feeding structure 112 from touching each other. If the first feed structure 111 and the second feed structure 112 are fabricated on different metal layers, or if the space permits, the arms of the first feed structure 111 and/or the second feed structure 112 may not be bent, but instead T-shape. In addition, according to other embodiments, each of the first feeding structure 111 and the second feeding structure 112 may also have an L-shaped or linear structure, and have curved or non-bending arms, and the first feeding structure The shapes of 111 and the second feeding structure 112 can be the same or different.

As shown in FIG. 1 , the antenna unit 110 can have a first conductive portion 117 and a second conductive portion 119 , wherein the first conductive portion 117 can surround the second conductive portion 119 , so the second conductive portion 119 can be in an island shape. The first conductive portion 117 and the second conductive portion 119 can be fabricated using the same metal layer, and are coplanar with each other. According to other embodiments, the first conductive portion 117 and the second conductive portion 119 may be fabricated using different metal layers without being coplanar. If the first conductive portion 117 and the second conductive portion 119 are not coplanar, the first conductive portion 117 can be higher or lower than the second conductive portion 119 .

In Fig. 1, any two, any three, or four of the first feed structure 111, the second feed structure 112, the first conductive portion 117, and the second conductive portion 119 of the antenna unit 110 may be coplanar ( For example, formed with the same metal layer), or may be non-coplanar with each other (eg, formed with different metal layers).

If two of the first feed structure 111 , the second feed structure 112 , the first conductive portion 117 and the second conductive portion 119 are not coplanar, one may be located above the other. In other words, one of the first feed structure 111, the second feed structure 112, the first conductive portion 117, and the second conductive portion 119 can be formed on an upper metal layer, and the other can be formed on a lower metal layer. layer.

The antenna unit 110 may optionally have or not have the second conductive portion 119 of FIG. 1 . If the antenna unit 110 has the second conductive portion 119 , the slot between the first conductive portion 117 and the second conductive portion 119 can be a slot ring. If the antenna unit 110 does not have the second conductive portion 119 , the first opening 118 can be an aperture.

In FIG. 1 , the slot between the first conductive portion 117 and the second conductive portion 119 is a square annular slot, but this is only an example, and the embodiment is not limited thereto. The slot between the first conductive portion 117 and the second conductive portion 119 can also be a circular slot or an elliptical slot.

As for the second conductive part 119, it can be square, circular, oval or other suitable shapes that can send and receive signals smoothly.

In Fig. 1, if both the first conductive portion 117 and the second conductive portion 119 are formed on the first metal layer 115, and the first metal layer 115 includes the first sub-metal layer and the second sub-metal layer, then the first conductive portion 117 may be a first sub-metal layer of the first metal layer 115, and the second conductive portion 119 may be a second sub-metal layer of the first metal layer 115, wherein the first sub-metal layer may surround the second sub-metal layer, and The first opening 118 can be located between the first sub-metal layer and the second sub-metal layer to form an annular slot. For example, the first sub-metal layer (that is, the first conductive portion 117 in FIG. 1 ) can be ground and have a reference potential, and the second sub-metal layer (that is, the second conductive portion in FIG. 1 119) may not be the end of the earth. In other embodiments, for example, when the area of the second sub-metal layer is large enough so that the circuit structure (such as the processing unit, the transmitting circuit 120 and the receiving circuit 130) is disposed on the second sub-metal layer, the second sub-metal layer can be It has a reference potential for the ground terminal.

According to an embodiment, the first sub-metal layer (eg, the first conductive portion 117 of FIG. 1 ) generated using the first metal layer 115 may have a first thickness, and the second sub-metal layer ( For example, the second conductive portion 119) may have a second thickness, wherein the first thickness may be equal to the second thickness. For example, if the first metal layer 115 is a metal layer of a printed circuit board, the first thickness mentioned here may be equal to the second thickness. However, if the first metal layer 115 is a metal plate element (for example, iron plate), the first thickness described here may be different from the second thickness. Users can choose appropriate conditions and metal layer thickness according to their technology and process requirements.

According to an embodiment, in the antenna unit 110 , the first feeding structure 111 and the second feeding structure 112 may be insulated from the first conductive portion 117 . In another embodiment, at least one of the first feed structure 111 and the second feed structure 112 can be electrically connected to the first conductive portion 117, for example, through a conductive via (VIA) of the printed circuit board. electrically connected.

As shown in FIG. 1 , the annular slot between the first conductive portion 117 and the second conductive portion 119 can be a square annular slot. The first orthographic projection of the first feeding structure 111 and the second orthographic projection of the second feeding structure 112 can overlap the first side slot and the second side slot of the square annular slot respectively. The first side groove may extend along a first direction d1, the second side groove may extend along a second direction d2, the first direction d1 may be perpendicular to the second direction d2, and the first side groove may be adjacent to the second side groove. In Fig. 1, the first side groove may have a first width W1 in the second direction d2, the second side groove may have a second width W2 in the first direction d1, and the first width W1 may optionally be equal to The second width W2.

With regard to the positions of the first feed structure 111 and the second feed structure 112 , the characteristics of their hardware can be as follows. As shown in Figure 1, viewed from above, the first reference line L1 can pass through the first feeding point C111 of the first feeding structure 111 and the center point C118 of the first opening 118, and the second reference line L2 can pass through The second feeding point C112 of the second feeding structure 112 and the center point C118 of the first opening 118, and the included angle θ2 between the first reference line L1 and the second reference line L2 can be between 45 degrees and 135 degrees. , that is, 45° ≤ θ2 ≤ 135°. Wherein, generally speaking, viewed from a top view, the first feeding point C111 is used as the position where the first feeding structure 111 overlaps with the edge of the first opening 118 close to the transmission line, and the second feeding point C112 is used as the second feeding structure 112 overlaps with the edge of the first opening 118 close to the transmission line.

In FIG. 1 , the first orthographic projection of the first feed structure 111 and the second orthographic projection of the second feed structure 112 do not overlap the second conductive portion 119 . However, according to other embodiments, the first orthographic projection of the first feeding structure 111 and/or the second orthographic projection of the second feeding structure 112 may overlap the second conductive portion 119 . In addition, the first feed structure 111 and/or the second feed structure 112 can be electrically connected to the second conductive portion 119 , which also belongs to the scope of the embodiments. For example, the first feed structure 111 and/or the second feed structure 112 can be electrically connected to the second conductive portion 119 through a conductive via (VIA) of the printed circuit board.

When the antenna unit 110 does not have the second conductive portion 119, the hole in the first conductive portion 117 of FIG. 1 (that is, the first opening 118 of FIG. 1 ) can be a hole, which can be a square hole, a circular hole pores or oval pores. The embodiment in which the first opening 118 is a hole will be further described below with reference to FIG. 2 .

FIG. 2 is a schematic diagram of a radar signal device 200 in another embodiment. Fig. 2 may be a top view, and Fig. 2 is only schematic, rather than presenting precise dimensions and proportions. The radar signal device 200 can be similar to the radar signal device 100 , but in the radar signal device 200 , the antenna unit 110 does not have the second conductive portion 119 , and the first opening 118 can be a circular hole. In FIG. 2 , the first feeding structure 111 is linear, and the second feeding structure 112 is T-shaped. FIG. 2 is used as an example to describe different states of the antenna unit 110 . As shown in FIG. 2 , the two arms of the second feeding structure 112 may have radians to correspond to the shape of the first opening 118 , which also falls within the scope of the embodiments.

FIG. 3 is a schematic diagram of the antenna unit 110 having the first metal layer 115 and the second metal layer 116 in the embodiment. Fig. 3 may be a cross-sectional view of Fig. 1 along section line 3-3', and Fig. 3 is only schematic, rather than presenting precise dimensions and proportions. According to an embodiment, the antenna unit 110 may further include a second metal layer 116, wherein the first metal layer 115 and the second metal layer 116 may be arranged along a thickness direction dt, and the thickness direction dt is perpendicular to the first direction d1 and perpendicular to the second direction. d2. As shown in FIG. 2 , the second opening 116A may be formed in the second metal layer 116 and penetrate through the second metal layer 116 . The first opening 118 and the second opening 116A may at least partially overlap each other, so as to prevent the second metal layer 116 from blocking the first opening 118 . According to another embodiment, the first opening 118 and the second opening 116A may completely overlap each other. Where the first opening 118 and the second opening 116A overlap, wireless signals can pass through to avoid blocking wireless signals and form a bidirectional radiation pattern.

In the example shown in FIG. 3 , the first metal layer 115 can be used as a ground terminal, and the first feed structure 111 and the second feed structure 112 can be coplanar with the second metal layer 116 . In other words, the first feed structure 111 and the second feed structure 112 can be formed on the second metal layer 116 . In FIG. 3 , the second metal layer 116 is located above the first metal layer 115 , but this is only an example. According to other embodiments, the second metal layer 116 may also be located below the first metal layer 115 .

FIG. 4 is a schematic diagram of a radar signal device 400 in another embodiment. Fig. 4 may be a perspective view, and Fig. 4 is only a schematic diagram, rather than presenting precise dimensions and proportions. The radar signal device 400 can be similar to the radar signal device 100 in FIG. 1 and the radar signal device 200 in FIG. 2 , and the similarities will not be repeated. Compared with the radar signal device 100 and the radar signal device 200 , the antenna unit 1101 of the radar signal device 400 may further include a reflector 410 . The reflector 410 can be used, for example, to reflect the first radiation pattern to form the first unidirectional radiation pattern, and to reflect the second radiation pattern to form the second unidirectional radiation pattern, for example. Radiation field type. The distance dx between the reflecting plate 410 and the first metal layer 115 can be greater than or equal to 0.1 air wavelength (free space wavelength) and less than or equal to 1 air wavelength, wherein the air wavelength can be one of the transmitted signal ST and the received signal SR in the air wavelength. The medium between the reflection plate 410 and the first metal layer 115 can be air, so bolts and/or sponges, or other components can be used to separate and fix the reflection plate 410 and the first metal layer 115 . In this way, the manufacturing cost and difficulty of the manufacturing process can be greatly reduced. The material of the reflector 410 can be a conductive material such as metal that can reflect wireless signals.

FIG. 5, FIG. 6 and FIG. 7 are schematic diagrams of the antenna pattern of the radar signal device 400 in FIG. 4 in different embodiments. In FIG. 5 , FIG. 6 and FIG. 7 , the curves 510 , 520 , 530 , 610 , 620 , 630 , 710 , 720 and 730 can be used to represent the antenna patterns. Curves 510, 520, 530, 610, 620, 630, 710, 720, and 730 may correspond to the antenna unit 1101, the distance dx between the reflector 410 and the first metal layer 115 is 0.05 air wavelength, 0.1 air wavelength, Antenna patterns at 0.25 air wavelength, 0.35 air wavelength, 0.4 air wavelength, 0.45 air wavelength, 0.5 air wavelength, 0.6 air wavelength and 0.8 air wavelength. In the data tables from Figure 5 to Figure 7, the column max can be the maximum gain (gain) of the corresponding curve, the column 3dB Beamwidth can be the beam width (beam width) of 3dB, and the column 6dB Beamwidth can be 6dB beam width. As shown in FIG. 5 and FIG. 6 , when the distance dx between the reflector 410 and the first metal layer 115 is larger, the gain values corresponding to the left and right sides of the antenna pattern can be larger. Therefore, for example, in the corridor environment, the visible radar signal device 400 is placed in different positions of the corridor, such as the corner, the center of the corridor, the ceiling, etc., to adjust the distance dx to adjust the antenna field shape, and then adjust the detection radius, so that Can detect objects in the hallway. The antenna pattern in Figure 5 has a larger gain near 0 degrees and is suitable for placement in corners. The antenna pattern in Figure 6 has a larger gain near ±45 degrees, and is suitable for placement in the center of the corridor. The antenna pattern in Figure 7 has larger gains near 0 degrees and on the left and right sides. For example, it can detect objects in special scenes and spaces.

FIG. 8 is an S-parameter graph generated by using the radar signal device 100 in FIG. 1 in the embodiment. In Fig. 8, the curves 810, 820 and 830 may be the S22 parameter, the S21 parameter and the S11 parameter respectively. In FIG. 8, the curves 810 and 830 can be used to observe the return loss (return loss), and the curve 820 can be used to observe the isolation. As shown in Figure 8, the S22 parameter and S11 parameter can be lower than -8.5dB, and the S21 parameter can be lower than -18dB, so it can be seen that the return loss is small enough and the isolation is large enough.

Since the isolation of the antenna unit of the radar signal device is sufficient, an external amplifier, such as a low noise amplifier (LNA), can be used to amplify the processed signal SP or the second internal signal S2 generated according to the received signal SR , so as to improve the performance of the radar signal device, and prevent the amplifier in the integrated circuit for processing the second internal signal S2 from being saturated and unable to operate normally.

To sum up, using the radar signal devices 100 and 200 provided by the embodiment, and the antenna unit 110 in various forms mentioned above, a radar device with a bidirectional radiation pattern can be realized. The isolation and return loss of the antenna unit of the radar signal device fall within the ideal range. Moreover, by using the radar signal devices 100 and 200 provided by the embodiment, the area and volume of the hardware can fall within a sufficiently small range. In addition, using the radar signal device 400 provided in the embodiment and the above-mentioned antenna unit 1101, since in the antenna unit 1101, the distance dx between the reflection plate 410 and the first metal layer 115 can be selected as a value between 0.1 air wavelength and 1 air wavelength According to the needs of the use environment, the antenna pattern can be adjusted by the reflector, and then various special antenna pattern designs can be realized, so it can be applied to object detection in various scenarios. Furthermore, the medium between the reflection plate 410 and the first metal layer 115 can be air, so the manufacturing cost and difficulty of the manufacturing process can be greatly reduced. Therefore, the radar signal device provided by the embodiment is helpful for dealing with many problems in terms of performance and manufacturing process.

100,200,400: radar signal device 110,1101:antenna unit 111: The first feed structure 111A, 112A: arm 112: Second feed structure 115: the first metal layer 116: Second metal layer 116A: second opening 117: the first conductive part 118: First opening 119: the second conductive part 120: Transmitting circuit 130: receiving circuit 3-3': Split line 410: reflector 510 to 530, 610 to 630, 710 to 730, 810 to 830: curve C111: First feed point C112: Second feed point C118: Center point d1: the first direction d2: second direction dt: thickness direction E1: The direction of the first co-polarized electric field in the first radiation field type E2: The direction of the second co-polarized electric field in the second radiation field type L1: first reference line L2: Second reference line S1: The first internal signal S2: Second internal signal SP: Processing Signals SR: receive signal ST: transmit signal W1: first width W2: second width θ1, θ2: included angle

Figure 1 is a schematic diagram of the radar signal device in the embodiment. Figure 2 is a schematic diagram of a radar signal device in another embodiment. FIG. 3 is a schematic diagram of an antenna unit having a first metal layer and a second metal layer in an embodiment. Fig. 4 is a schematic diagram of a radar signal device in another embodiment. Fig. 5, Fig. 6 and Fig. 7 are schematic diagrams of the antenna pattern of the radar signal device in Fig. 4 in different embodiments. Fig. 8 is the S-parameter graph generated by using the radar signal device in Fig. 1 in the embodiment.

100: Radar signal device

110: Antenna unit

111: The first feed structure

111A, 112A: arm

112: Second feed structure

115: the first metal layer

117: the first conductive part

118: First opening

119: the second conductive part

120: Transmitting circuit

130: receiving circuit

3-3': Split line

C111: First feed point

C112: Second feed point

C118: Center point

d1: the first direction

d2: second direction

E1: The direction of the first co-polarized electric field in the first radiation field type

E2: The direction of the second co-polarized electric field in the second radiation field type

L1: first reference line

L2: Second reference line

S1: The first internal signal

S2: Second internal signal

SP: Processing Signals

SR: receive signal

ST: transmit signal

W1: first width

W2: second width

θ1, θ2: included angle

Claims (25)

A radar signal device, comprising: An antenna unit is used to simultaneously transmit a transmission signal and receive a reception signal within a period of time, and the antenna unit includes: a first metal layer, wherein a first opening is formed in the first metal layer, and the first opening penetrates the first metal layer; A first feed structure, wherein a first orthographic projection of the first feed structure on the first metal layer at least partially overlaps with the first opening, the first feed structure is used to receive a first internal signal , and the transmit signal is generated based on at least the first internal signal; and A second feed structure, wherein a second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the first opening, the second feed structure is used to output a second internal signal , and the second internal signal is generated based on the received signal; a transmitting circuit for generating the first internal signal; and a receiving circuit for generating a processed signal, wherein the processed signal is related to the second internal signal; wherein The antenna unit is used to generate a first radiation field type and a second radiation field type, the first radiation field type is used to transmit the transmission signal and has a first common polarization electric field direction, and the second radiation field type is used for To receive the received signal and have a second co-polarized electric field direction, an angle is formed between the first co-polarized electric field direction and the second co-polarized electric field direction, and the angle of the included angle is greater than or equal to 45 degrees and less than or equal to 135 degrees, and the first opening is used to form the first radiation pattern into a first bidirectional radiation pattern, and to make the second radiation pattern into a second bidirectional radiation pattern. The radar signal device described in item 1 of the patent scope, wherein the antenna unit further includes a second metal layer, the first metal layer and the second metal layer are arranged along a thickness direction, and a second opening is formed in the The second metal layer, and the first opening and the second opening at least partially overlap each other. The radar signal device described in item 2 of the scope of the patent application, wherein the first opening and the second opening completely overlap each other. The radar signal device described in claim 2 of the patent application, wherein the first metal layer is used as a ground terminal, and the first feed structure and the second feed structure are coplanar with the second metal layer. The radar signal device as described in item 1 of the patent scope, wherein the first metal layer includes a first sub-metal layer and a second sub-metal layer, the first sub-metal layer surrounds the second sub-metal layer, the The first opening is located between the first sub-metal layer and the second sub-metal layer to form an annular slot. The radar signal device as described in item 5 of the scope of the patent application, wherein the first sub-metal layer is used as a ground terminal. The radar signal device as described in item 5 of the scope of patent application, wherein the annular slot is a square annular slot, the first orthographic projection of the first feeding structure and the second orthographic projection of the second feeding structure A first side groove and a second side groove respectively overlapped on the square annular slot hole, the first side groove extends along a first direction, the second side groove extends along a second direction, and the first direction is perpendicular to in the second direction, and the first side groove is adjacent to the second side groove. The radar signal device as described in item 7 of the patent scope, wherein the first side slot has a first width in the second direction, the second side slot has a second width in the first direction, and The first width is equal to the second width. The radar signal device as described in item 5 of the scope of the patent application, wherein the annular slot includes a circular slot or an elliptical annular slot. The radar signal device as described in claim 5 of the patent application, wherein the first sub-metal layer has a first thickness, the second sub-metal layer has a second thickness, and the first thickness is equal to the second thickness. The radar signal device as described in item 1 of the scope of the patent application, wherein the first opening includes a square hole, a circular hole or an elliptical hole. The radar signal device as described in item 1 of the scope of the patent application, wherein the first metal layer is used as a ground terminal. According to the radar signal device described in item 1 of the scope of the patent application, the shapes of the first feeding structure and the second feeding structure include linear shape, T shape or tuning fork shape. The radar signal device as described in claim 1 of the patent application, wherein the direction of the first co-polarized electric field is orthogonal to the direction of the second co-polarized electric field. A radar signal device, comprising: An antenna unit is used to simultaneously transmit a transmission signal and receive a reception signal within a period of time, and the antenna unit includes: a first metal layer, wherein a first opening is formed in the first metal layer, and the first opening penetrates the first metal layer; A first feed structure, wherein a first orthographic projection of the first feed structure on the first metal layer at least partially overlaps with the first opening, the first feed structure is used to receive a first internal signal , and the transmitted signal is generated based on at least the first internal signal; A second feed structure, wherein a second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the first opening, the second feed structure is used to output a second internal signal , and the second internal signal is generated based on the received signal; and A reflector, wherein the distance between the reflector and the first metal layer is greater than or equal to 0.1 air wavelength and less than or equal to 1 air wavelength; a transmitting circuit for generating the first internal signal; and a receiving circuit for generating a processed signal related to the second internal signal; wherein The antenna unit is used to generate a first radiation field type and a second radiation field type, the first radiation field type is used to transmit the transmission signal and has a first common polarization electric field direction, and the second radiation field type is used for To receive the received signal and have a second co-polarized electric field direction, an angle is formed between the first co-polarized electric field direction and the second co-polarized electric field direction, and the angle of the included angle is greater than or equal to 45 degrees and less than or equal to 135 degrees, and the reflecting plate is used to make the first radiation pattern form a first unidirectional radiation pattern, and to make the second radiation pattern form a second unidirectional radiation pattern. The radar signal device as described in item 15 of the patent scope, wherein the antenna unit further includes a second metal layer, the first metal layer and the second metal layer are arranged along a thickness direction, and a second opening is formed in the The second metal layer, and the first opening and the second opening at least partially overlap each other. The radar signal device described in claim 16 of the patent application, wherein the first metal layer is used as a ground terminal, and the first feed structure and the second feed structure are coplanar with the second metal layer. The radar signal device as described in item 15 of the patent scope, wherein the first metal layer includes a first sub-metal layer and a second sub-metal layer, the first sub-metal layer surrounds the second sub-metal layer, the The first opening is located between the first sub-metal layer and the second sub-metal layer to form an annular slot. The radar signal device as described in claim 18, wherein the first sub-metal layer serves as a ground terminal. The radar signal device as described in item 18 of the scope of the patent application, wherein the annular slot includes a square annular slot, a circular annular slot or an elliptical annular slot. The radar signal device as described in item 15 of the scope of the patent application, wherein the first opening includes a square hole, a circular hole or an elliptical hole. The radar signal device as described in claim 21, wherein the first metal layer serves as a ground terminal. The radar signal device as described in claim 15 of the patent application, wherein the direction of the first co-polarized electric field is orthogonal to the direction of the second co-polarized electric field. A radar signal device, comprising: An antenna unit is used to simultaneously transmit a transmission signal and receive a reception signal within a period of time, and the antenna unit includes: a first metal layer, wherein a first opening is formed in the first metal layer, and the first opening penetrates the first metal layer; A first feed structure, wherein a first orthographic projection of the first feed structure on the first metal layer at least partially overlaps with the first opening, the first feed structure is used to receive a first internal signal , and the transmit signal is generated based on at least the first internal signal; and A second feed structure, wherein a second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the first opening, the second feed structure is used to output a second internal signal , and the second internal signal is generated based on the received signal; a transmitting circuit for generating the first internal signal; and a receiving circuit for generating a processed signal, wherein the processed signal is related to the second internal signal; Wherein a first reference line passes through a first feeding point of the first feeding structure and a central point of the first opening, and a second reference line passes through a second feeding point of the second feeding structure and a center point of the first opening. At the central point of the first opening, an included angle between the first reference line and the second reference line is between 45 degrees and 135 degrees, and the antenna unit is used to generate a first radiation pattern and a first radiation pattern. Two radiation patterns, the first radiation pattern is used to emit the transmitted signal, the second radiation pattern is used to receive the received signal, and the first opening is used to make the first radiation pattern form a first two-way The radiation field type is used to make the second radiation field type form a second bidirectional radiation field type. A radar signal device, comprising: An antenna unit is used to simultaneously transmit a transmission signal and receive a reception signal within a period of time, and the antenna unit includes: a first metal layer, wherein a first opening is formed in the first metal layer, and the first opening penetrates the first metal layer; A first feed structure, wherein a first orthographic projection of the first feed structure on the first metal layer at least partially overlaps with the first opening, the first feed structure is used to receive a first internal signal , and the transmitted signal is generated based on at least the first internal signal; A second feed structure, wherein a second orthographic projection of the second feed structure on the first metal layer at least partially overlaps with the first opening, the second feed structure is used to output a second internal signal , and the second internal signal is generated based on the received signal; and A reflector, wherein the distance between the reflector and the first metal layer is greater than or equal to 0.1 air wavelength and less than or equal to 1 air wavelength; a transmitting circuit for generating the first internal signal; and a receiving circuit for generating a processed signal, wherein the processed signal is related to the second internal signal; Wherein a first reference line passes through a first feeding point of the first feeding structure and a central point of the first opening, and a second reference line passes through a second feeding point of the second feeding structure and a center point of the first opening. At the central point of the first opening, an included angle between the first reference line and the second reference line is between 45 degrees and 135 degrees, and the antenna unit is used to generate a first radiation pattern and a first radiation pattern. Two radiation patterns, the first radiation pattern is used to emit the transmitted signal, the second radiation pattern is used to receive the received signal, and the reflector is used to make the first radiation pattern form a first unidirectional The radiation field type is used to make the second radiation field type form a second unidirectional radiation field type.

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