JP6759309B2 - Sensor with flat beam generating antenna - Google Patents

Description

The present invention relates to a Doppler sensor or radar for detecting the relative speed, distance, orientation, etc. of a moving body such as an automobile, a railroad, or an infrastructure device, and more particularly to a sensor or radar having a flat beam generating antenna.

Doppler sensors or radars that use radio waves have been put into practical use as peripheral condition detection sensors for safe operation of automobiles, railways, infrastructure equipment, and the like. For the sake of brevity, the description will be limited to Doppler sensors or radars for automobiles.

As a Doppler sensor or radar for automobiles, a sensor or radar that covers all areas such as front long distance, front medium distance, front short distance, side, rear medium distance, etc. for safe driving support and automatic driving realization Used. This is to detect various objects such as obstacles in front, vehicles in front, vehicles in the rear, and people according to the driving scene.

There is an antenna structure disclosed in FIG. 1 of Patent Document 1 or FIG. 1 of Patent Document 2. In Patent Document 1, a flat beam is generated by setting the number of parallel antenna elements 101 to be different in the direction connected by the feeding line 100 and the direction in which the antenna elements 101 are not connected. In Patent Document 2, the number of parallel transmitting side unit antennas 31 to 34 and the number of parallel receiving side unit antennas 11, 12 (21, 22) are different in the horizontal direction and the vertical direction shown in FIG. 1 of Patent Document 2. As a result, a flat beam is generated.

However, the antenna structure disclosed in Patent Document 1 or Patent Document 2 has a problem that the length of the feeding line that supplies power to the antenna element or the unit antenna becomes long, and the antenna gain decreases due to the transmission loss of the feeding line. there were.

In order to reduce the loss due to the feeding line, there is an antenna structure disclosed in FIGS. 1 and 2 of Patent Document 3. In Patent Document 3, the dielectric lens 4 is composed of a primary radiator 6 composed of one patch antenna 16 and a metal horn 12, and the primary radiator 6 is arranged at the focal position of the dielectric lens 4. .. By using the horn 16 and the dielectric lens 4, the antenna gain can be improved by condensing the electromagnetic waves radiated from one patch antenna 16.

Japanese Unexamined Patent Publication No. 2012-05928 Japanese Unexamined Patent Publication No. 2012-222507 Japanese Unexamined Patent Publication No. 2000-22608

A common issue with Doppler sensors or radars for automobiles is that the radio beam transmitted or received from the antennas that make up the sensor or radar must have a flat shape that is wide in the horizontal direction and narrow in the vertical direction. Is. The reason for this is that while widening the viewing angle with respect to the object in the horizontal direction, noise (road clutter noise) due to unnecessary radiation from the ground is reduced in the vertical direction, and the detection sensitivity of the received signal (signal-to-noise ratio). This is to extend the detection distance by raising it.

In the structure disclosed in Patent Document 3 for reducing the loss due to the feeding line, which is a problem of Patent Document 1 or Patent Document 2, the primary radiator 6 and the dielectric lens 4 have only a focal distance sufficiently longer than the wavelength of the electromagnetic wave. Since the electromagnetic waves radiated from the primary radiator 6 are arranged apart from each other, the electromagnetic waves radiated from the primary radiator 6 are distributed in a substantially circular shape on the opening surface of the dielectric lens 4, so that the electromagnetic waves radiated from the dielectric lens 4 are substantially isometric beams. There is a problem that a flat beam cannot be generated as an electromagnetic wave suitable for a sensor due to its shape.

The sensor to be disclosed is a sensor having an antenna, and the antenna is a guide that internally propagates a substrate, a radiating portion formed on the substrate, and an electromagnetic wave radiated from the radiating portion to radiate as a beam. The waveguide has a wave tube, and the shape of the radiating side opening is longer in the second direction than in the first direction orthogonal to each other, and is larger than the opening on the opposite side to the radiating side opening. The radiating side opening is larger, and the edge portion of the opening opposite to the radiating side opening is arranged so as to include the radiating portion on the substrate surface side on which the radiating portion is formed. A dielectric lens is provided in the radiation side opening, and the electric field surface direction of the radiation unit is the second direction.

The disclosed sensor has an antenna, which is capable of producing a flat beam suitable for the sensor.

It is a structural drawing of a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is the shape of the dielectric substrate that constitutes the flat beam generation antenna. It is the shape of the dielectric substrate that constitutes the flat beam generation antenna. This is the shape of the flat beam generation antenna seen from the opening side of the horn. This is the shape of the flat beam generation antenna seen from the opening side of the horn. It is a structural drawing of a flat beam generation antenna. It is a block diagram of the sensor which has a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is the shape of the dielectric substrate that constitutes the flat beam generation antenna. It is the shape of the dielectric substrate that constitutes the flat beam generation antenna. It is a block diagram of the sensor which has a flat beam generation antenna. It is a block diagram of the sensor which has a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a block diagram of the sensor which has a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a block diagram of the sensor which has a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is operation explanatory drawing of the flat beam generation antenna. It is a structural drawing of a flat beam generation antenna. It is a block diagram of the driving support system provided with the sensor which has a flat beam generation antenna. It is a figure which showed the mounting angle to the moving body of the sensor which has a flat beam generation antenna. It is a figure which showed the mounting angle to the moving body of the sensor which has a flat beam generation antenna. It is a figure which showed the mounting angle to the moving body of the sensor which has a flat beam generation antenna.

Hereinafter, each embodiment will be described with reference to the drawings.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the examples, the members having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted. The flat beam generating antenna in each embodiment constitutes the main part of the sensor or radar (hereinafter, the sensor is represented).

1 and 2A are structural diagrams of the flat beam generating antenna of this embodiment. In FIGS. 1 and 2A, the flat beam generating antenna is formed on the dielectric substrate 100, the first radiation portion 110a formed on the first surface of the dielectric substrate 100, and the first surface of the dielectric substrate 100. The first conductor portion 120a, the second conductor portion 130a formed on the second surface of the dielectric substrate 100 opposite to the first surface, and the through hole 400a formed in the dielectric substrate 100. It has a first horn 200a as a waveguide whose inner surface is formed of a conductor at least, and a first dielectric lens 300a provided inside the first horn 200a.

The first virtual line A1-A1'is a virtual line in the radiation side opening surface of the first horn 200a, and the second virtual line B1-B1'is the radiation side opening of the first horn 200a. It is an in-plane virtual line, the optical axis C1-C1'is the optical axis of the first dielectric lens 300a, and the intersection 10a is the optical axis C1-C1' of the dielectric lens 300a and the first dielectric substrate. It is the intersection with the first surface of 100.

The first virtual line A1-A1'is a line that passes through the center of the radiation side opening figure of the first horn 200a and has the shortest length, and the second virtual line B1-B1'is the first virtual line. It is a line that passes through the center of the line A1-A1'and is orthogonal to the first virtual line A1-A1', and in this embodiment, the length of the first virtual line A1-A1'is the second. It is longer than the length of the virtual lines B1-B1'. That is, in this embodiment, the radial opening figure of the first horn 200a is a rectangle whose length in the direction of the first virtual line A1-A1'is longer than the length in the direction of the second virtual line B1-B1'. Has the shape of.

The figure shown on the upper side of FIG. 1 shows the shape of the flat beam generating antenna of this embodiment as viewed from the radiation side opening side of the first horn 200a. Further, the figure shown in the lower left of FIG. 1 shows a cross-sectional shape along the first virtual line A1-A1'of the flat beam generating antenna of this embodiment. Further, the figure shown in the lower right of FIG. 1 shows a cross-sectional shape along the second virtual line B1-B1'of the flat beam generating antenna of this embodiment.

FIG. 2A shows the shape of the dielectric substrate 100 as viewed from the side of the first surface. On the first surface of the dielectric substrate 100, the first conductor portion 120a is formed so as to surround the first radiation portion 110a at a predetermined distance from the first radiation portion 110a, and is formed through the through hole 400a. By being electrically connected to the second conductor portion 130a formed on the second surface of the dielectric substrate 100, the first conductor portion 120a and the second conductor portion 130a are connected to the first radiation portion 110a. Since it operates as a reference potential surface, the first radiation unit 110a operates as a patch antenna and emits electromagnetic waves in the direction of the first surface of the dielectric substrate 100.

Further, the radiation portion side opening located on the side opposite to the radiation side opening of the first horn 200a is arranged on the first surface side of the dielectric substrate 100 so as to include the first radiation portion 110a. Radiation. Due to the structure of the first radiating portion 110a and the first horn 200a, the electromagnetic wave radiated from the first radiating portion 110a is converted from a spherical wave to a plane wave by the first horn 200a. It is possible to emit a beam that is directional in the direction.

Further, in this embodiment, since the length of the first virtual line A1-A1'is longer than that of the second virtual line B1-B1', the shape of the beam radiated from the first horn 200a is the first. A flat beam is generated so that the width in the direction of the second virtual line B1-B1'is wider than the direction of the virtual line A1-A1' of 1.

It is desirable that the intervals at which the through holes 400a are arranged are shorter than one-fourth of the wavelength of the electromagnetic wave used in the dielectric substrate 100.

Further, by electrically connecting the first horn 200a to the first conductor portion 120a, the potential of the first horn 200a can be made equal to the reference potential of the first radiating portion 110a. It is possible to efficiently transmit the electromagnetic wave radiated from the radiating unit 110a to the first horn 200a.

Further, by arranging the first dielectric lens 300a having a convex shape in the direction of the radiation portion side opening in the radiation side opening of the first horn 200a, the radiation portion side opening of the first horn 200a Therefore, the length of the opening on the radiation side can be shortened, and the antenna can be miniaturized.

Further, the cross-sectional shape of the first dielectric lens 300a has a hyperbolic shape in which the direction of the first virtual line A1-A1'is a hyperbolic shape and a linear shape in the direction of the second virtual line B1-B1'. , It is possible to suppress the side lobes of the azimuth of the first virtual line A1-A1'and the azimuth of the second virtual line B1-B1'of the beam emitted from the first dielectric lens 300a, respectively.

In the direction of the first virtual line A1-A1', the center of the first radiation portion 110a is the optical axis C1-C1'of the first dielectric lens 300a and the first surface of the dielectric substrate 100. It is desirable to place it at the intersection 10a.

2B and 2C show the shape of the dielectric substrate 100 constituting the flat beam generating antenna of this embodiment as viewed from the side of the first surface. In FIGS. 2B and 2C, the first feeding line 140a is a feeding line.

In FIGS. 2B and 2C, the first radiation unit 110a is connected to the first power supply line 140a, and the first conductor unit 120a is a predetermined distance from the first radiation unit 110a and the first power supply line 140a. It is formed so as to surround the first radiation portion 110a.

With such a structure, the first radiating unit 110a is supplied with the energy of the electromagnetic wave radiated from the first radiating unit 110a via the first feeding line 140a. The antenna gain can be improved by the structure in which only the first radiation portion 110a is connected to the feeding line 140a.

The connection direction of the first radiation unit 110a and the first power supply line 140a is either the direction of FIG. 2B or FIG. 2C, or both of FIGS. 2B and 2C, depending on the plane of polarization of the electromagnetic wave used. It doesn't matter the direction.

3A and 3B show the shape of the flat beam generating antenna of this embodiment as viewed from the radiation side opening side of the first horn 200a. Further, FIG. 3C is a structural diagram of the flat beam generation antenna of this embodiment.

In FIG. 3A, the shape of the radial opening of the first horn 200a is such that the length in the direction of the first virtual line A1-A1'is longer than the length in the direction of the second virtual line B1-B1'. , The four corners have a curved shape.

Further, in FIG. 3B, the shape of the radiating side opening of the first horn 200a is such that the length in the direction of the first virtual line A1-A1'is longer than the length in the direction of the second virtual line B1-B1'. It has a long oval shape.

In the flat beam generation antenna of this embodiment, the shape of the radiation side opening of the first horn 200a is shown in FIG. 1 according to the ease of manufacturing the first horn 200a and the radiation pattern of the generated flat beam. Either the rectangular shape shown or the shape including the curved portion shown in FIG. 3A or FIG. 3B may be selected. Further, depending on the radiation pattern of the flat beam to be generated, a horn shape having a ridge at the radiation side opening or the radiation side opening may be used.

In FIG. 3C, unlike the first horn 200a, the second horn 200b is provided with a second dielectric lens 300b inside the second horn 200b. The flat beam generating antenna shown in FIG. 3C is the same as the first horn 200a except that the side surface shape of the second horn 200b has a curved shape.

In the flat beam generation antenna of this embodiment, the side surface shape of the first horn 200a may be the shape of the second horn 200b.

Further, the side surface shape of the first horn 200a is selected according to the radiation pattern of the flat beam to be generated, such as a linear shape shown in FIG. 1 and a curved shape shown in FIG. 3C, and an uneven shape. May be good.

FIG. 4 is a block diagram of the sensor having the flat beam generating antenna according to the first to third embodiments. In FIG. 4, the sensor has a distribution circuit 500 including first to third terminals 501a to 503a, a first transmission circuit 510a, and a first reception circuit 520a.

In FIG. 4, the flat beam generating antenna having the first radiation portion 110a, the first conductor portion 120a, the first horn 200a, and the first dielectric lens 300a is the antenna according to the first to third embodiments. The configuration is schematically shown.

In FIG. 4, the first radiation unit 110a is connected to the first terminal 501a, the first transmission circuit 510a is connected to the second terminal 502a, and the first reception circuit 520a is connected to the third terminal 503a. Will be done. The distribution circuit 500 operates so as to output the signal input from the second terminal to the first terminal and output the signal input from the first terminal to the third terminal.

The operation of the sensor of this embodiment shown in FIG. 4 is as follows. The signal output from the first transmission circuit 510a is input to the first radiation unit 110a via the distribution circuit 500, and is radiated from the first dielectric lens 300a as an electromagnetic wave. On the other hand, the electromagnetic wave radiated from the first dielectric lens 300a is irradiated to an obstacle or the like, and the electromagnetic wave reflected by the obstacle or the like is electrified in the first radiating portion 110a via the first dielectric lens 300a. It is converted into a target signal and further input to the first receiving circuit 520a via the distribution circuit 500.

A sensor having a flat beam generating antenna that operates in this way is applied as a sensor that measures the distance to an obstacle or the like and the relative speed of the obstacle or the like.

5 and 6A are structural diagrams of the flat beam generating antenna of this embodiment.

In FIGS. 5 and 6A, the flat beam generation antenna is composed of the dielectric substrate 100, the second and third radiation portions 110b and 110c formed on the first surface of the dielectric substrate 100, and the dielectric substrate 100. A third conductor portion 120b formed on the first surface, a fourth conductor portion 130b formed on the second surface located on the side opposite to the first surface of the dielectric substrate 100, and the dielectric substrate 100. A third horn 200c arranged on the side of the first surface of the dielectric substrate 100 and having at least an inner surface formed of a conductor, and a third horn 200c provided inside the third horn 200c. It has 3 dielectric lenses 300c.

The third virtual line A2-A2'is a virtual line in the radiation side opening plane of the third horn 200c, and the fourth virtual line B2-B2'is in the radiation side opening plane of the third horn 200c. The optical axis C2-C2'is the optical axis of the third dielectric lens 300c, and the intersection 10b is the optical axis C2-C2'of the third dielectric lens 300b and the third dielectric substrate 100. It is the intersection with the surface of 1.

The third virtual line A2-A2'is a line that passes through the center of the radiating side opening figure of the third horn 200c and has the shortest length, and the fourth virtual line B2-B2'is a third virtual line. It is a line that passes through the center of A2-A2'and is orthogonal to the third virtual line A2-A2', and in this embodiment, the length of the third virtual line A2-A2'is the fourth virtual line. Longer than the length of lines B2-B2'. That is, in the present embodiment, the radial opening figure of the third horn 200c is a rectangle whose length in the direction of the third virtual line A2-A2'is longer than the length in the direction of the fourth virtual line B2-B2'. Has the shape of.

The figure shown on the upper side of FIG. 5 shows the shape of the flat beam generating antenna of this embodiment as viewed from the radiation side opening side of the third horn 200c. Further, the figure shown in the lower left of FIG. 5 shows a cross-sectional shape along the third virtual line A2-A2'of the flat beam generating antenna of this embodiment. Further, the figure shown in the lower right of FIG. 5 shows the cross-sectional shape along the fourth virtual line B2-B2'of the flat beam generating antenna of this embodiment.

FIG. 6A shows the shape of the dielectric substrate 100 as viewed from the side of the first surface. On the first surface of the dielectric substrate 100, the third conductor portion 120b surrounds the second and third radiation portions 110b and 110c at a predetermined distance from the second and third radiation portions 110b and 110c. The third conductor portion 120b and the fourth conductor are electrically connected to the fourth conductor portion 130b formed on the second surface of the dielectric substrate 100 through the through hole 400b. Since the unit 130b operates as a reference potential surface of the second and third radiation units 110b and 110c, the second and third radiation units 110b and 110c each operate as a patch antenna, and the first of the dielectric substrate 100. It emits electromagnetic waves in the direction of the surface.

Further, the radiating portion side opening located on the side opposite to the radiating side opening of the third horn 200c is a first of the dielectric substrate 100 so as to include the second and third radiating portions 110b and 110c. It is placed on the surface side. Due to the structure of the second and third radiating portions 110b and 110c and the third horn 200c, the electromagnetic waves radiated from the second and third radiating portions 110b and 110c have an electromagnetic wave surface due to the third horn 200c. It is converted from a spherical wave to a plane wave, and it becomes possible to emit a directional beam in a desired direction.

Further, in the present embodiment, since the length of the third virtual line A2-A2'is longer than that of the fourth virtual line B2-B2', the shape of the beam emitted from the third horn 200c is the third. A flat beam is generated so that the width in the direction of the fourth virtual line B2-B2'is wider than the direction of the virtual line A2-A2' of the third.

It is desirable that the intervals at which the through holes 400b are arranged are shorter than the length of one-fourth of the wavelength of the electromagnetic wave used in the dielectric substrate 100.

Further, by electrically connecting the third horn 200c to the third conductor portion 120b, the potential of the third horn 200c can be made equal to the reference potential of the second and third radiation portions 110b and 110c. Therefore, it is possible to efficiently transmit the electromagnetic waves radiated from the second and third radiating portions 110b and 110c to the third horn 200c.

Further, by arranging the third dielectric lens 300c having a convex shape in the direction of the radiation portion side opening in the radiation side opening of the third horn 200c, the radiation portion side opening of the third horn 200c Therefore, the length of the opening on the radiation side can be shortened, and the size of the antenna can be reduced.

Further, the cross-sectional shape of the third dielectric lens 300c has a hyperbolic shape in the direction of the third virtual line A2-A2'and a linear shape in the direction of the fourth virtual line B2-B2'. It is possible to suppress the side lobes of the third virtual line A2-A2'direction and the fourth virtual line B2-B2'direction of the beam emitted from the third dielectric lens 300c, respectively.

In the direction of the third virtual line A2-A2', the centers of the second and third radiation portions 110b and 110c are the optical axis C2-C2'of the third dielectric lens 300c and the first of the dielectric substrate 100. It is desirable to arrange it at a position symmetrical with respect to the intersection point 10b with the plane of 1. Further, it is desirable that the centers of the second and third radiation portions 110b and 110c are arranged in the direction of the fourth virtual line B2-B2'.

The shape of the opening on the radiation side of the third horn 200c may be any shape described in the third embodiment. Further, the side surface shape of the third horn 200c may be any of the shapes described in the third embodiment.

6B and 6C show the shape of the dielectric substrate 100 constituting the flat beam generating antenna of this embodiment as viewed from the side of the first surface. In FIGS. 6B and 6C, the second and third feed lines 140b and 140c are feed lines, respectively.

In FIGS. 6B and 6C, the second radiating section 110b is connected to the second feeding line 140b, the third radiating section 110c is connected to the third feeding line 140c, and the third conductor section 120b is It is formed so as to surround the second and third radiating portions 110b and 110c at a predetermined distance from the second and third radiating portions 110b and 110c and the second and third feeding lines 140b and 140c.

With such a structure, the second radiation unit 110b is supplied with the energy of the electromagnetic wave radiated from the second radiation unit 110b via the second power supply line 140b, and the third radiation unit 110c is supplied with the third power supply line. The energy of the electromagnetic wave radiated from the third radiating unit 110c is supplied via the 140c.

The connection direction between the second radiation unit 110b and the second power supply line 140b and the connection direction between the third radiation unit 110c and the third power supply line 140c depend on the plane of polarization of the electromagnetic wave used in FIG. 6B. Alternatively, it may be in either direction of FIG. 6C, or in both directions of FIGS. 6B and 6C.

FIG. 7 is a block diagram of the sensor having the flat beam generating antenna according to the fifth to sixth embodiments. In FIG. 7, the flat beam generating antenna having the second and third radiating portions 110b and 110c, the third conductor portion 120b, the third horn 200c, and the third dielectric lens 300c is described in Examples 5 to 6. The antenna configuration described in the above is schematically shown.

In FIG. 7, the second radiating section 110b is connected to the first transmitting circuit 510a, and the third radiating section 110c is connected to the first receiving circuit 520a.

The operation of the sensor of this embodiment shown in FIG. 7 is as follows. The signal output from the first transmission circuit 510a is input to the second radiation unit 110b and radiated as an electromagnetic wave from the third dielectric lens 300c. On the other hand, the electromagnetic wave radiated from the third dielectric lens 300c is irradiated to an obstacle or the like, and the electromagnetic wave reflected by the obstacle or the like is electrified in the third radiating portion 110c via the third dielectric lens 300c. It is converted into a target signal and input to the first receiving circuit 520a.

A sensor having a flat beam generating antenna operating in this way is applied as a sensor for measuring the distance to an obstacle or the like and the relative speed of the obstacle or the like, and is isolated between transmission and reception as compared with the sensor described in the fourth embodiment. Can be increased.

FIG. 8 is a block diagram of the sensor having the flat beam generating antenna according to the fifth to sixth embodiments. In FIG. 8, the sensor has a second receiving circuit 520b, including second and third radiating portions 110b and 110c, a third conductor portion 120b, a third horn 200c, and a third dielectric lens 300c. The flat beam generating antenna included is a schematic representation of the antenna configuration according to Examples 5 to 6.

In FIG. 8, the second radiating portion 110b is connected to the first terminal 501a, the first transmitting circuit 510a is connected to the second terminal 502a, and the first receiving circuit 520a is connected to the third terminal 503a. The third radiating section 110c is connected to the second receiving circuit 520b. Similar to the fourth embodiment, the distribution circuit 500 outputs the signal input from the second terminal 502a to the first terminal 501a, and outputs the signal input from the first terminal 501a to the third terminal 503a. It works to output.

The operation of the sensor of this embodiment shown in FIG. 8 is as follows. The signal output from the first transmission circuit 510a is input to the second radiation unit 110b via the distribution circuit 500, and is radiated as an electromagnetic wave from the third dielectric lens 300c. On the other hand, the electromagnetic wave radiated from the third dielectric lens 300c is applied to an obstacle or the like, and the electromagnetic wave reflected by the obstacle or the like is electrified in the second radiation portion 110b via the third dielectric lens 300c. The electromagnetic wave is converted into a target signal, further input to the first receiving circuit 520a via the distribution circuit 500, and the reflected electromagnetic wave is an electrical signal at the third emitting unit 110c via the third dielectric lens 300c. Is converted to and input to the second receiving circuit 520b. That is, the sensor of this embodiment includes one transmission channel and two reception channels.

A sensor having a flat beam generating antenna that operates in this way is a radar that measures the direction of the fourth virtual line B2-B2'of an obstacle in addition to the distance to an obstacle and the relative velocity of the obstacle. Applicable.

9 and 10 are structural diagrams of the flat beam generating antenna of this embodiment. In FIGS. 9 and 10, the fifth virtual line B3-B3'is a virtual line in the radiation side opening plane of the first or third horn 200a or 200c. The fifth virtual line B3-B3'passes the midpoint of the first virtual line A1-A1'and the midpoint of the third virtual line A2-A2', and the first virtual lines A1-A1'and the third. It is a line orthogonal to the virtual line A2-A2'of.

That is, in the flat beam generation antenna of the present embodiment, the flat beam generation antenna described in Examples 1 to 3 and the flat beam generation antenna described in Examples 5 to 6 are the second virtual lines B1-B1'. And the third virtual line B2-B2'both have a structure arranged so as to overlap with the fifth virtual line B3-B3'.

Due to such an antenna structure, the optical axis C1-C1'of the first dielectric lens 300a (not shown in FIG. 9) and the optical axis C2-C2'of the third dielectric lens 300c (not shown in FIG. 9). (Not described) are parallel to each other, so the beam center directions emitted from the respective antennas are the same. Further, since the first virtual line A1-A1'and the third virtual line A2-A2' are parallel to each other, the flattening directions of the beams radiated from the respective antennas are the same.

Therefore, the flat beam generating antenna of this example can improve the antenna gain as compared with the flat beam generating antenna of Examples 1 to 3 or 5 to 6.

It should be noted that any of the structures described in Examples 2 and 6 can be applied to the connection structure of the power supply line to the first radiation unit 110a and the power supply line to the second and third radiation units 110b and 110c, respectively. I do not care.

Further, in this embodiment, two flat beam generation antennas are arranged so that the second virtual line B1-B1'and the third virtual line B2-B2' both overlap with the fifth virtual line B3-B3'. However, the effect is the same even if the second virtual line B1-B1'and the third virtual line B2-B2' are arranged in parallel with each other, not limited to this structure.

Further, as the flat beam generating antennas to be arranged, any combination and number of flat beam generating antennas according to the application can be applied to the types and numbers of the flat beam generating antennas described in Examples 1 to 3 or Examples 5 to 6.

FIG. 11 is a block diagram of the sensor having the flat beam generating antenna according to the ninth embodiment. In FIG. 11, the flat beam generating antenna by the first radiation portion 110a, the first conductor portion 120a, the first horn 200a, and the first dielectric lens 300a has the antenna configuration described in Examples 1 to 3. Schematically shown, the flat beam generating antenna with the second and third radiation portions 110b and 110c, the third conductor portion 120b, the third horn 200c, and the third dielectric lens 300c is implemented. The antenna configurations according to Examples 5 to 6 are schematically shown.

In FIG. 11, the first radiating section 110a is connected to the first transmitting circuit 510a, the second radiating section 110b is connected to the first receiving circuit 520a, and the third radiating section 110c is connected to the second receiving circuit. Connected to 520b.

The operation of the sensor of this embodiment shown in FIG. 11 is as follows. The signal output from the first transmission circuit 510a is input to the first radiation unit 110a and radiated as an electromagnetic wave from the first dielectric lens 300a. On the other hand, the electromagnetic wave radiated from the first dielectric lens 300a is irradiated to an obstacle or the like, and the electromagnetic wave reflected by the obstacle or the like is electrified in the second radiating portion 110b via the third dielectric lens 300c. The electromagnetic wave is converted into a target signal and input to the first receiving circuit 520a, and the reflected electromagnetic wave is converted into an electrical signal at the third radiation unit 110c via the third dielectric lens 300c, and the second electromagnetic wave is converted into an electrical signal. It is input to the receiving circuit 520b. That is, the sensor of this embodiment includes one transmission channel and two reception channels.

A sensor having a flat beam generating antenna that operates in this way is a radar that measures the direction of the fifth virtual line B3-B3'of an obstacle in addition to the distance to an obstacle and the relative velocity of the obstacle. It is applicable, and it is possible to increase the isolation between transmission and reception as compared with the sensor having the flat beam generation antenna according to the eighth embodiment.

FIG. 12 is a structural diagram of the flat beam generating antenna of this embodiment, and FIG. 13 is a block diagram of the sensor having the flat beam generating antenna described in FIG.

FIG. 12 shows the shape of the dielectric substrate 100 as viewed from the first surface side. In FIG. 12, there are fourth and fifth radiation units 110d and 110e. In FIG. 12, the centers of the second to fifth radiation portions 110b to 110e are point-symmetrical with respect to the intersection point 10b of the optical axis C2-C2'of the third dielectric lens 300c and the first surface of the dielectric substrate 100. It is placed in a suitable position. Other than that, the structures of the horn and the dielectric lens are the same as those of Examples 1 to 3, 5 to 6 and 9.

In FIG. 13, there are third and fourth receiving circuits 520c and 520d. In FIG. 13, the flat beam generation antenna by the first radiation portion 110a, the first conductor portion 120a, the first horn 200a, and the first dielectric lens 300a has the antenna configuration described in Examples 1 to 3. It is shown schematically. Further, the flat beam generation antenna by the second to fifth radiation portions 110b to e, the third conductor portion 120b, the third horn 200c, and the third dielectric lens 300c has a schematic antenna configuration shown in FIG. It is shown as a target.

In FIG. 13, the first radiating section 110a is connected to the first transmitting circuit 510a, the second radiating section 110b is connected to the first receiving circuit 520a, and the third radiating section 110c is connected to the second receiving circuit. It is connected to 520b, the fourth radiation source 110d is connected to the third receiving circuit 520c, and the fifth radiation 110e is connected to the fourth receiving circuit 520d.

The operation of the sensor of this embodiment shown in FIG. 13 is as follows. The signal output from the first transmission circuit 510a is input to the first radiation unit 110a and radiated as an electromagnetic wave from the first dielectric lens 300a. On the other hand, the electromagnetic wave radiated from the first dielectric lens 300a is irradiated to an obstacle or the like, and the electromagnetic wave reflected by the obstacle or the like is electrified in the second radiating portion 110b via the third dielectric lens 300c. The electromagnetic wave is converted into a target signal and input to the first receiving circuit 520a, and the reflected electromagnetic wave is converted into an electrical signal at the third radiation unit 110c via the third dielectric lens 300c, and the second electromagnetic wave is converted into an electrical signal. The electromagnetic wave input to the receiving circuit 520b and reflected is converted into an electric signal at the fourth radiation unit 110d via the third dielectric lens 300c, and is input to the third receiving circuit 520c and reflected. Is converted into an electrical signal in the fifth radiation unit 110e via the third dielectric lens 300c and input to the fourth reception circuit 520d. That is, the sensor of this embodiment includes one transmission channel and four reception channels.

The sensor having the flat beam generation antenna of this embodiment that operates in this way has the distance to the obstacle, the relative velocity of the obstacle, the orientation of the fifth virtual line B3-B3'of the obstacle, and the like. It is applicable to radars that measure the orientation of the first virtual line A1-A1'or the third virtual line A2-A2' of an obstacle.

14 and 15 are structural diagrams of the flat beam generating antenna of this embodiment, and FIG. 16 is a conceptual diagram showing the operation of the flat beam generating antenna described in FIGS. 14 and 15.

In FIGS. 14 and 15, the flat beam generation antenna includes the dielectric substrate 100, the fifth to seventh radiation portions 110f to 110h formed on the first surface of the dielectric substrate 100, and the first of the dielectric substrate 100. On the fifth conductor portion 120c formed on the first surface, the sixth conductor portion 120c formed on the second surface located on the side opposite to the first surface of the dielectric substrate 100, and the dielectric substrate 100. The formed through hole 400c, the fourth horn 200d arranged on the side of the first surface of the dielectric substrate 100 and having at least the inner surface formed by a conductor, and the fourth horn 200d provided inside the fourth horn 200d. It has a dielectric lens of 300d.

The sixth virtual line A3-A3'is a virtual line in the radiation side opening surface of the fourth horn 200d, and the seventh virtual line B4-B4'is the radiation side opening of the fourth horn 200d. It is an in-plane virtual line, the optical axis C3-C3'is the optical axis of the fourth dielectric lens 300d, and the intersection 10c is the optical axis C3-C3'of the fourth dielectric lens 300d and the dielectric substrate 100. It is the intersection with the first surface of.

The sixth virtual line A3-A3'is a line that passes through the center of the radiation side opening figure of the fourth horn 200d and has the shortest length, and the seventh virtual line B4-B4'is the sixth virtual line. It is a line that passes through the center of A3-A3'and is orthogonal to the sixth virtual line A3-A3', and in this embodiment, the length of the sixth virtual line A3-A3' is the seventh virtual line. It is longer than the length of B4-B4'. That is, in this embodiment, the radiating side opening figure of the fourth horn 200d has a rectangular shape in which the length in the direction of the sixth virtual line A3-A3'is longer than the length of the seventh virtual line B4-B4'. Has.

The figure shown on the upper side of FIG. 14 shows the shape of the flat beam generating antenna of this embodiment as viewed from the radiation side opening side of the fourth horn 200d. Further, the figure shown in the lower left of FIG. 14 shows the cross-sectional shape of the flat beam generating antenna of this embodiment along the sixth virtual line A3-A3'. Further, the figure shown in the lower right of FIG. 14 shows the cross-sectional shape of the flat beam generating antenna of this embodiment along the seventh virtual line B4-B4'.

FIG. 15 shows the shape of the dielectric substrate 100 as viewed from the side of the first surface. On the first surface of the dielectric substrate 100, the fifth conductor portion 120c is formed so as to surround the fifth to seventh radiation portions 110f to 110h at a predetermined distance from the fifth to seventh radiation portions 110f to 110h. The fifth conductor portion 120c and the sixth conductor portion 130c are electrically connected to the sixth conductor portion 130c formed on the second surface of the dielectric substrate 100 through the through hole 400c. Operates as a reference potential surface of the fifth to seventh radiating portions 110f to 110h, so that the fifth to seventh radiating portions 110f to 110h each operate as a patch antenna and move in the direction of the first surface of the dielectric substrate 100. It emits electromagnetic waves.

Further, the radiation portion side opening located on the side opposite to the radiation side opening of the fourth horn 200d includes the first surface of the dielectric substrate 100 so as to include the fifth to seventh radiation portions 110f to 110h. Placed on the side. Due to the structure of the fifth to seventh radiating portions 110f to 110h and the fourth horn 200d, the electromagnetic wave radiated from the fifth to seventh radiating portions 110f to 110h has a spherical wave on the electromagnetic wave surface due to the fourth horn 200d. Is converted into a plane wave, and it becomes possible to emit a directional beam in a desired direction.

Further, in the present embodiment, since the length of the sixth virtual line A3-A3'is longer than that of the seventh virtual line B4-B4', the shape of the beam emitted from the fourth horn 200d is the third. A flat beam is generated so that the width in the direction of the seventh virtual line B4-B4'is wider than the direction of the virtual line A3-A3' in 6.

It is desirable that the interval at which the through holes 400c are arranged is shorter than the length of one-fourth of the wavelength of the electromagnetic wave used in the dielectric substrate 100.

Further, by electrically connecting the fourth horn 200d to the fifth conductor portion 120c, the potential of the fourth horn 200d can be made equal to the reference potential of the fifth to seventh radiating portions 110f to 110h. Therefore, it is possible to efficiently transmit the electromagnetic waves radiated from the fifth to seventh radiation units 110f to 110h to the fourth horn 200d.

Further, by arranging the fourth dielectric lens 300d having a convex shape in the direction of the radiation portion side opening in the radiation side opening of the fourth horn 200d, the radiation portion side opening of the fourth horn 200d Therefore, the length of the opening on the radiation side can be shortened, and the antenna can be miniaturized.

Further, the cross-sectional shape of the fourth dielectric lens 300d has a hyperbolic shape in the direction of the sixth virtual line A3-A3'and a linear shape in the direction of the seventh virtual line B4-B4'. , It is possible to suppress the side lobes of the direction of the sixth virtual line A3-A3'and the direction of the seventh virtual line B4-B4'of the beam emitted from the fourth dielectric lens 300d, respectively.

Further, in the direction of the sixth virtual line A3-A3', the center of the sixth radiating portion 110g is the optical axis C3-C3' of the fourth dielectric lens 300d and the first surface of the dielectric substrate 100. It is located at the intersection 10c, and the centers of the fifth radiation portion 110f and the seventh radiation portion 110h are arranged symmetrically with respect to the intersection 10c.

The operation of the flat beam generating antenna of this embodiment shown in FIGS. 14 and 15 will be described with reference to FIG. In FIG. 16, the first to third radial directions 20a to 20c are shown.

When equal power is supplied to each of the fifth to seventh radiation units 110f to 110h, or when power is supplied only to the sixth radiation unit 110g, the center of the beam emitted from the fourth dielectric lens 300d is the fourth. The radial direction 20a is parallel to the optical axis C3-C3'of the dielectric lens 300d of No. 4. On the other hand, when power equal to the fifth radiation unit 110f and the sixth radiation unit 110g is supplied and power is not supplied to the seventh radiation unit 110h, the center of the beam emitted from the fourth dielectric lens 300d is The radiation direction 20b is shifted in the A3'direction of the sixth virtual line A3-A3'. Further, when power equal to the sixth radiation unit 110g and the seventh radiation unit 110h is supplied and power is not supplied to the fifth radiation unit 110f, the center of the beam emitted from the fourth dielectric lens 300d is The radiation direction 20c is shifted in the A3 direction of the sixth virtual line A3-A3'.

Therefore, the flat beam generating antenna of this embodiment enables beamforming in the direction of the sixth virtual line A3-A3', which has a narrow radiation beam width.

The shape of the opening on the radiation side of the fourth horn 200d may be any shape described in the third embodiment. Further, the side surface shape of the fourth horn 200d may be any of the shapes described in the third embodiment.

FIG. 17 is a structural diagram of the flat beam generation antenna of this embodiment. In FIG. 17, the flat beam generating antenna includes at least a fifth horn 200e whose inner surface is formed of a conductor and a fifth dielectric lens 300e. In FIG. 17, the eighth virtual line A4-A4'is a virtual line in the radiation side opening surface of the fifth horn 200e, and the ninth virtual line B5-B5'is the radiation side of the fifth horn 200e. The virtual line in the opening plane, C4-C4'is the target axis in the cross section in the direction of the eighth virtual line A4-A4' of the fifth horn, and the virtual normal D1-D1'is the electric body substrate. It is a virtual normal showing a vertical direction on the first surface of 100, and the tilt angle 30a is a tilt angle formed by the target axis C4-C4'and the virtual normal D1-D1'.

The eighth virtual line A4-A4'is a line that passes through the center of the radiating side opening figure of the fifth horn 200e and has the shortest length, and the ninth virtual line B5-B5'is the eighth virtual line. It is a line that passes through the center of A4-A4'and is orthogonal to the eighth virtual line A4-A4'. In this embodiment, the length of the eighth virtual line A4-A4' is the ninth virtual line. It is longer than the length of B5-B5'. That is, in this embodiment, the radiating side opening figure of the fifth horn 200e is a rectangular shape in which the length in the direction of the eighth virtual line A4-A4'is longer than the length of the ninth virtual line B5-B5'. Has.

The figure shown on the upper side of FIG. 17 shows the shape of the flat beam generating antenna of this embodiment as viewed from the radiation side opening side of the fifth horn 200e. Further, the figure shown in the lower left of FIG. 17 shows a cross-sectional shape along the eighth virtual line A4-A4'of the flat beam generating antenna of this embodiment. Further, the figure shown in the lower right of FIG. 17 shows the cross-sectional shape of the flat beam generating antenna of this embodiment along the ninth virtual line B5-B5'.

In FIG. 17, the radiation portion side opening located on the side opposite to the radiation side opening of the fifth horn 200e includes the first radiation portion 110a, and the eighth virtual line of the fifth horn 200e. The target axis C4-C4'in the direction of A4-A4'and the virtual normal D1-D1'are placed on the first surface side of the dielectric substrate 100 so that the tilt angle 30a is an arbitrary angle of 0 degrees or more. Be placed. Due to the structure of the first radiation unit 110a and the fifth horn 200e, the electromagnetic wave radiated from the first radiation unit 110a is converted from a spherical wave to a plane wave by the fifth horn 200e, and is a dielectric material. It is possible to radiate a directional beam in a desired direction tilted by a tilt angle of 30a from the direction of the virtual normal D1-D1'of the substrate 100. Further, in the present embodiment, since the length of the eighth virtual line A4-A4'is longer than that of the ninth virtual line B5-B5', the shape of the beam radiated from the fifth horn 200e is the third. A flat beam is generated so that the width in the direction of the ninth virtual line B5-B5'is wider than the direction of the virtual line A4-A4' in 8.

Further, by electrically connecting the fifth horn 200e to the first conductor portion 120a, the potential of the fifth horn 200e can be made equal to the reference potential of the first radiating portion 110a, so that the first It is possible to efficiently transmit the electromagnetic wave radiated from the radiating unit 110a to the fifth horn 200e.

Further, the fifth dielectric lens 300e is arranged in the radial opening of the fifth horn 200e so that the optical axis of the fifth dielectric lens and the target axis C4-C4'of the fifth horn overlap. As a result, the length of the radiating side opening from the radiating side opening of the fifth horn 200e can be shortened, and the antenna can be miniaturized.

Further, the cross-sectional shape of the fifth dielectric lens 300e has a hyperbolic shape in the direction of the eighth virtual line A4-A4'and a linear shape in the direction of the ninth virtual line B5-B5'. , It is possible to suppress the side lobes of the direction of the eighth virtual line A4-A4'and the direction of the ninth virtual line B5-B5'of the beam emitted from the fifth dielectric lens 300e, respectively.

In the direction of the eighth virtual line A4-A4', the center of the first radiation portion 110a is arranged at the intersection (unsigned) between the target axis C4-C4'and the first surface of the dielectric substrate 100. It is desirable to do.

The shape of the opening on the radiation side of the fifth horn 200e may be any shape described in the third embodiment. Further, the side surface shape of the fifth horn 200e may be any of the shapes described in the third embodiment.

In the flat beam generation antenna of this embodiment, the virtual normal line D1-D1 of the dielectric substrate 100 is not changed in the direction of the eighth virtual line A4-A4'in which the radiation beam width is narrow, without changing the installation angle of the dielectric substrate 100. It is possible to tilt in a desired direction tilted by a tilt angle of 30a from the direction of'.

FIG. 18 is a block diagram of a driving support system including a sensor having the flat beam generating antenna according to the tenth embodiment. In FIG. 18, the driving support system includes a vehicle control circuit 600a that controls the operation of a moving body such as power train control and vehicle body control.

In the driver assistance system including the sensor having the flat beam generation antenna of the present embodiment, the vehicle control circuit 600a is connected to the first transmission circuit 510a and the first reception circuit 520a and the second reception circuit 520b. .. This connection method may be a wired method using a cable or a wireless method such as a wireless LAN (Local Area Network).

The operation of the driving support system of this embodiment shown in FIG. 18 is as follows. The first transmission signal output from the vehicle control circuit 600a and input to the first transmission circuit 510a is output from the first transmission circuit 510a as a second transmission signal, and further input to the first radiation unit 110a. , It is radiated from the first dielectric lens 300a as a transmission electromagnetic wave. On the other hand, the transmitted electromagnetic wave radiated from the first dielectric lens 300a is irradiated to an obstacle or the like, and the received electromagnetic wave reflected by the obstacle or the like is passed through the third dielectric lens 300c to the second radiating portion 110b. Is converted into a first received signal and input to the first receiving circuit 520a, and the received electromagnetic wave is converted into a second received signal at the third radiating unit 110c via the third dielectric lens 300c. , Is input to the second receiving circuit 520b. Further, the first received signal is output from the receiving circuit 520a as a third received signal and input to the vehicle control circuit 600a, and the second received signal is output from the receiving circuit 520b as a fourth received signal to control the vehicle. It is input to the circuit 600a.

That is, the sensor of this embodiment includes one transmission channel and two reception channels, and the driving support system includes the distance to the obstacle, the relative speed of the obstacle, and the fifth virtual line B3-B3 of the obstacle. It is equipped with a sensor as a radar that can measure the direction of'.

Further, the vehicle control circuit 600a recognizes the position and distance of an obstacle or the like based on the relationship between the first transmission signal and the third and fourth reception signals, and outputs a control signal to the power train and the vehicle body control unit. This makes it possible to control the operation of the entire moving body according to the surrounding conditions.

FIG. 19A is a diagram showing a mounting angle of the sensor having the flat beam generating antenna according to the tenth embodiment to a moving body. In FIG. 19A, 40a is the vertical direction, 40b is the horizontal direction, and the tenth virtual line B6-B6'is the center of the first virtual line A1-A1'and the fourth virtual line A2-A2'. It is a tenth virtual line passing through the center of. In FIG. 19A, the first virtual line A1-A1'and the fourth virtual line A2-A2' are parallel to the vertical direction 40a.

The cross-sectional shape of the beam radiated from the flat beam generation antenna of this embodiment shown in FIG. 19A is the direction of the first virtual line A1-A1'and the fourth virtual line A2-A2'. Is narrower than the width in the direction of the tenth virtual line B6-B6'. Therefore, the cross-sectional shape of the beam radiated from the flat beam generation antenna of the present embodiment is narrower in the vertical direction 40a and wider in the horizontal direction 40b. With such an antenna structure, it is possible to realize a radar having a wide horizontal azimuth while reducing road clutter noise.

The mounting position of the sensor having the flat beam generation antenna of this embodiment on the moving body may be any of the front, side, and rear of the moving body.

FIG. 19B is a diagram showing a mounting angle of the sensor having the flat beam generating antenna according to the tenth embodiment to a moving body. In FIG. 19, the polarization angle 50a is the polarization angle formed by the first virtual line A1-A1', the fourth virtual line A2-A2', and the tenth virtual line B6-B6'.

In FIG. 19B, the tenth virtual line B6-B6'is parallel to the horizontal direction 40b, and the polarization angle 50a is preferably 45 degrees. Since the beam radiated from the flat beam generating antenna of this embodiment shown in FIG. 19B has a polarization angle of 45 degrees with respect to the vertical direction 40a, it is possible to reduce the influence of load clutter noise.

The mounting position of the sensor having the flat beam generation antenna of this embodiment on the moving body may be any of the front, side, and rear of the moving body.

FIG. 19C is a diagram showing a mounting angle of the sensor having the flat beam generating antenna according to the thirteenth embodiment to a moving body. In FIG. 19C, the traveling direction 40c of the moving body and the ground 700 are shown. In FIG. 19C, the cross-sectional direction of the eighth virtual line A4-A4'is parallel to the traveling direction 40c of the moving body.

The sensor having the flat beam generation antenna of this embodiment shown in FIG. 19C can be applied as a speed sensor for detecting the relative speed of a moving body.

In FIG. 19C, the flat beam generating antenna is arranged so that the beam radiation direction faces the ground, but it may be arranged at an arbitrary position of the moving body according to the position of the object for which the relative velocity is detected. Further, the object for which the relative velocity is detected is not limited to the ground, but may be an arbitrary fixed object such as a wall or a railroad track.

In the above, preferred forms of the structure and operation of the flat beam generating antenna of the present embodiment, the sensor having the flat beam generating antenna, and the driving support system including the sensor have been described in Examples 1 to 17.

However, even if the number and shape of the radiating portions constituting the flat beam generating antenna are different from those described in Examples 1 to 17, the effect obtained by the flat beam generating antenna of the present embodiment is the same.

Further, in Examples 1 to 16, the first to fifth dielectric lenses 300a to 300e have a convex shape in the direction of the first to eighth radiating portions 110a to 110h, but the first to eighth radiating portions 110a to 110h. It may have a convex shape in the opposite direction to the above. Further, depending on the shape of the radiating side opening surface of the first to fifth horns 200a to 200e, the shape of the first to fifth dielectric lenses 300a to 300e may be a rotating bipolar line shape in addition to the cylindrical shape. I do not care.

Further, the type and the number of combinations of the flat beam generating antenna and the sensor having the flat beam generating antenna may be any combination other than Examples 1 to 16.

Further, the mounting angle of the sensor having the flat beam generating antenna to the moving body and the direction of the beam radiated from the flat beam generating antenna may be any shape other than the embodiment of Example 15 or 17.

Further, the material constituting the dielectric substrate 100 may be any of a resin-based material, a ceramic-based material, and a semiconductor material.

10: Intersection of the optical axis of the dielectric lens and the first surface of the dielectric substrate, 20: Radiation direction, 100: Dielectric substrate, 110: Radiation part, 120: Conductor part, 130: Conductor part, 140: Feed Wire, 200: Horn, 300: Dielectric lens, 400: Through hole, 500: Distribution circuit, 501: First terminal, 502: Second terminal, 503: Third terminal, 510: Transmission circuit, 520: Receiving circuit, 600: Vehicle control circuit.

Claims (4)

Have a antenna, a sensor for detecting the relative speed, the distance or orientation of the mobile,
The antenna is
With the board
The radiating part formed on the substrate and
It has a waveguide that internally propagates an electromagnetic wave radiated from the radiation unit and radiates it as a beam.
The radiation portion includes a first radiation portion formed on the first surface of the substrate, a first conductor portion formed on the first surface, and a side opposite to the first surface of the substrate. The waveguide has a second conductor portion formed on a second surface located at
Arranged on the first surface side of the substrate,
The shape of the radial opening is longer in the second direction than in the first direction, which is orthogonal to each other.
The radiating side opening is larger than the opening on the opposite side to the radiating side opening.
The edge portion of the opening on the opposite side to the radiation side opening is arranged so as to include the radiation portion on the substrate surface side on which the radiation portion is formed.
A dielectric lens is provided in the radiation side opening.
A sensor characterized in that the electric field surface direction of the radiating portion is the second direction. In the sensor according to claim 1,
A sensor characterized by converting an electromagnetic wave radiated from the radiation unit from a spherical wave to a plane wave. In the sensor according to claim 1 or 2.
A sensor characterized in that the dielectric lens has a linear cross-sectional shape in the first direction and a hyperbolic cross-sectional shape in the second direction. A plurality of antennas seen including, in the driving support system provided with a sensor for measuring the orientation of the relative velocity or the obstacle distance between the vehicle and the obstacle, and with the vehicle and the obstacle,
The antenna is
The radiation part formed on the substrate and
It has a waveguide that internally propagates an electromagnetic wave radiated from the radiation unit and radiates it as a beam.
The radiating portion is located on the side opposite to the first radiating portion formed on the first surface of the substrate, the conductor portion formed on the first surface, and the first surface of the substrate. It has a second conductor portion formed on the second surface, and has.
The waveguide is
Arranged on the first surface side of the substrate,
The shape of the radial opening is longer in the second direction than in the first direction, which is orthogonal to each other.
The radiating side opening is larger than the opening on the opposite side to the radiating side opening.
The edge of the opening opposite to the radiation side opening is arranged so as to include the radiation portion on the substrate surface side on which the radiation portion is formed.
A dielectric lens is provided in the radiation side opening.
The electric field surface direction of the radiating portion is the second direction.
Further, a transmission circuit connected to the radiation unit and
A receiving circuit connected to the radiating portion of the antenna other than the transmitting circuit, and
A vehicle control unit connected to the transmission circuit and the reception circuit,
A driving support system characterized by having.

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