JP7145665B2 - Antenna device and radar device - Google Patents

Description

The present invention relates to a small antenna device and a radar device that are mounted on a vehicle, for example.

Conventionally, an antenna board having an antenna part for transmitting and receiving radio waves provided on the surface is arranged inside a housing composed of a cover body and a base body. equipment is used.

The antenna part of such an antenna device irradiates (transmits) radio waves such as millimeter waves and quasi-millimeter waves, and receives the reflected waves reflected by the detection target to determine the distance and direction (angle) to the detection target. can be detected.

An antenna device configured in this way is required to improve detection accuracy, and in order to improve detection accuracy, a plurality of antenna units having different directivities are sometimes provided to improve the radio wave characteristics of each. Specifically, it has been difficult to improve the radio wave characteristics of antennas with different directivities, such as increasing the transmission/receiving distance in a desired direction and improving angular characteristics.

JP 2016-197061 A

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an antenna device and a radar device that can improve the performance of a transmitting antenna section and a receiving antenna section that have different directivities according to the required radio wave characteristics. aim.

The present invention relates to an antenna device for transmitting and receiving radio waves, comprising: an antenna substrate on which a transmitting antenna section and a receiving antenna section having different directivities are arranged side by side; It is composed of a cover made of resin that transmits radio waves and a base that is arranged on the rear surface side of the antenna substrate. A transmission cover portion is provided, and a portion facing the reception antenna portion is a reception cover portion , the transmission cover portion is formed in a flat shape facing the surface of the antenna substrate, and the reception cover portion has an arch cross section. wherein the cross-sectional arch shape is an arch shape protruding in the transmission direction of the radio waves, and the antenna device is shaped along the wide-angle direction of the transmitted radio waves. .

The cover body is a resin-made case body called a radome that transmits radio waves.
The surface is the side of the antenna substrate on which the antenna section composed of the transmitting antenna section and the receiving antenna section is provided, so that the transmission direction in which radio waves are transmitted from the antenna section is the surface side with respect to the antenna substrate. Further, the back surface side is the opposite side of the front surface of the antenna substrate provided with the antenna section.

Further, the transmission antenna section and the reception antenna section may be a transmission antenna section and a reception antenna section, or may be the transmission antenna section and/or the reception antenna section. Further, as the antenna section, an antenna section may be provided in addition to the transmitting antenna section and the receiving antenna section .

Further, in the above-described cover body, the portion facing the receiving antenna section refers to a portion facing the front surface of the receiving antenna section with a predetermined gap therebetween, and the portion facing the transmitting antenna section refers to the portion facing the transmitting antenna section. It refers to a portion facing each other at a predetermined interval on the surface side of the transmitting antenna section .

The above-mentioned wide-angle direction of the radio wave to be transmitted refers to a desired direction to be diffused among the diffusion directions of the radio wave to be transmitted (hereinafter referred to as a transmission wave), and mainly to be diffused by the shape of the antenna and the arrangement of the batch antennas. It refers to the direction, and can be, for example, the width direction of the vehicle in which it is mounted.

The above-mentioned arch-shaped cross section along the wide-angle direction of the transmitted radio wave as well as protruding in the transmission direction in which the radio wave is transmitted means, for example, in the case of an antenna device that transmits radio waves forward, it protrudes forward. In addition, it means that the cross section along the width direction is arched, not only the arch shape composed of a constant curvature or a curve whose curvature changes, but also the almost arch shape where the direction of the straight line changes along the cross section direction. Including the case of configuring

Furthermore, even if the cross-sectional arch shape on the surface side and the arch shape on the inner surface side are the same, the thickness may be different so as to change. Further, as long as the cross-section along the wide-angle direction is arch-shaped, the cross-section in the direction intersecting the wide-angle direction may be flat or curved.

The above-mentioned flat shape facing the surface of the antenna substrate means a planar shape parallel to the surface of the antenna substrate, a slightly curved surface shape, or a planar shape slightly inclined with respect to the surface. good too.

According to the present invention, it is possible to improve the performance of the transmitting antenna section and the receiving antenna section with different directivities according to the radio wave characteristics required for each.
Specifically, in the cover body covering the surface of the antenna substrate at a predetermined distance, a transmission cover portion, which is a portion facing the transmission antenna portion , is formed in a flat shape facing the surface of the antenna substrate, Since the receiving cover portion, which is the portion facing the receiving antenna portion , projects in the transmitting direction of the transmitted wave and is formed in an arch-shaped cross-section along the wide-angle direction of the transmitted wave, light can pass through each facing portion of the cover body. The radio wave characteristics of the radio waves transmitted or received by the transmission antenna section (hereinafter referred to as transmission/reception) differ from those of the radio waves transmitted/received by the reception antenna section .

Specifically, since the transmission cover portion through which radio waves transmitted/received by the transmission antenna portion (hereinafter referred to as transmission waves/reception waves) pass through is formed in a flat shape facing the surface of the antenna substrate, The distance for transmitting/receiving the transmitted wave/received wave can be increased in a desired direction.

On the other hand, the receiving cover portion through which the radio wave transmitted/received by the receiving antenna portion is transmitted protrudes in the transmission direction of the transmitted wave and is formed in an arch-shaped cross section along the wide-angle direction of the transmitted wave. can improve the angular characteristics of the transmitted wave/received wave in
Therefore, it is possible to achieve both the extension of the transmission/reception distance of the transmission/reception waves in the desired direction and the improvement of the different directivity of the response to a wide angular range of the transmission/reception waves.

In addition, the performance of the transmitting antenna section and the receiving antenna section can be improved according to the radio wave characteristics required for each.
Specifically, in the cover body covering the surface of the antenna substrate at a predetermined distance, a receiving cover portion facing the receiving antenna portion for receiving the radio wave protrudes in the transmitting direction of the transmitted wave, The transmission cover portion, which is formed in an arch shape in cross section along the wide-angle direction of the transmission wave and faces the transmission antenna portion for transmitting the radio waves, is formed in a flat shape facing the surface of the antenna substrate. The radio wave characteristic of the radio wave transmitted through the facing portion of the cover body differs between the transmitted wave and the received wave at the receiving antenna portion as it is reflected by the detection target.

Specifically, since the transmission cover portion through which the transmission wave is transmitted is formed in a flat shape facing the surface of the antenna substrate, the detection distance of the transmission wave can be increased in a desired direction. .
On the other hand, since the receiving cover portion through which the received wave passes protrudes from the transmitting antenna portion in the transmitting direction of the transmitting wave and is formed in an arch-shaped cross section along the wide-angle direction of the transmitting wave, the angle at the receiving antenna portion Characteristics can be improved.

Therefore, the transmitted wave reaches a distant object to be detected, and the reflected wave from a wide angle range can be received by the receiving antenna unit as a received wave, so that the detection accuracy of the antenna device can be improved.

As an aspect of the present invention, the reception cover portion may be provided with thin portions having a thickness thinner than other portions on both sides of the arch-shaped cross section.
The thin portion, which is thinner than the other portions, may be formed by recessing the front surface of the reception cover portion toward the rear surface side from the other portions, or may be formed on the rear surface of the reception cover portion toward the front surface from the other portions. It may be formed by being recessed into or by both. Furthermore, it may be formed in a groove shape, or may be formed in a smooth recess.

According to the present invention, the influence of the transmitted/received waves on the range exceeding the desired angular range is suppressed, that is, the angular characteristics of the receiving antenna are improved, and the transmitted/received waves in the desired angular range are transmitted/received with high precision. can receive.

Further, as an aspect of the present invention, the thin portion may be configured by a concave portion provided on the surface of the reception cover portion .
The thin portion constituted by the concave portion provided on the front surface of the reception cover portion may be a thin portion formed with a desired thickness by the concave portion provided on the front surface, or a desired thickness by the concave portion provided on the front surface and the back surface. It may be a configured thin portion.

According to the present invention, compared to the case where the thin portion configured with a desired thickness is configured by a concave portion provided on the back surface, the thin portion configured by the concave portion provided on the front surface can transmit the transmitted wave over a range exceeding the desired angular range. /The influence of the received wave can be further suppressed, that is, the angular characteristics of the receiving antenna section can be further improved, and the transmitted/received wave can be transmitted/received in a desired angular range with higher accuracy.

Further, as an aspect of the present invention, the thin portion may be provided outside a portion facing the receiving antenna portion in the wide-angle direction.
According to the present invention, it is possible to accurately set a desired angular range with respect to the receiving antenna section in which the influence of transmitted/received waves is desired to be suppressed.
It should be noted that the outside of the portion facing the receiving antenna unit in the wide-angle direction is the outside in the width direction when the wide-angle direction is taken as the width direction of the antenna device, for example.

Further, as an aspect of the present invention, the transmission cover portion may be provided with cross-direction surfaces in a direction along the main surface forming the flat shape and in a direction crossing the transmission direction on both sides in the wide-angle direction.
Note that the above-described both sides in the wide-angle direction are, for example, both sides in the width direction when the wide-angle direction is defined as the width direction of the antenna device.

The direction along the main surface forming the flat shape and the crossing direction surface in the direction intersecting the transmission direction are the direction along the main surface of the transmission cover portion forming the flat shape in the diffusion direction and the transmission direction. It can be composed of an inclined surface or a curved surface that is inclined with respect to the direction intersecting the . The intersecting direction is a direction intersecting with the counter-transmitting direction with respect to the flat transmission cover portion , that is, a direction intersecting with the back surface side from the main surface, or a direction intersecting with the transmitting direction, that is, intersecting with the transmitting direction from the main surface. can be the direction to

According to the present invention, transmission/reception of transmission/reception waves to the rear (rear side) of the antenna device can be suppressed.
In more detail, since the antenna device is attached to the vehicle body with the transmission direction facing the direction in which the object to be detected is desired to be detected, the rear (back side) of the antenna device is the vehicle body, and the rear (back side) of the antenna device When a transmitted/received wave is transmitted/received, it may be reflected by the vehicle body to which the antenna device is attached, resulting in erroneous detection due to so-called multipath.

Therefore, on both sides of the transmission cover portion in the wide-angle direction, cross-direction surfaces are provided in a direction along the main surface forming the flat shape and in a direction that crosses the transmission direction, so that the transmission direction of the transmission wave/received wave is / Transmission/reception of transmission waves/reception waves toward the rear (rear side) can be suppressed without affecting the reception direction. Therefore, it is possible to suppress erroneous detection due to reflection from the vehicle body on which the antenna device is mounted, and improve detection accuracy.

Further, as an aspect of the present invention, direction guiding means for guiding a main transmission direction of the transmitted radio waves may be provided in a portion facing the transmitting antenna portion on the side of the transmitting cover portion facing the antenna substrate. .

According to the present invention, the transmission direction of radio waves transmitted from the transmitting antenna section can be guided in a desired direction, such as obliquely laterally from the front of the antenna device.
More specifically, for example, when the antenna device is installed in a corner of the vehicle, in addition to the front or rear of the vehicle, the object to be detected on the side of the vehicle may also be detected. In the case of the front direction of the vehicle, only one of the detection targets in front or rear of the vehicle and the side of the vehicle can be detected.

On the other hand, by providing a direction guide means for guiding the transmission direction of the transmitted radio wave to the portion facing the transmission antenna portion on the side of the transmission cover portion facing the antenna substrate, the transmission from the transmission antenna portion can be performed. It is possible to guide the transmission direction of the radio waves to the diagonal side from the front of the antenna device. can be detected.

Further, as an aspect of the present invention, the direction guiding means may be composed of a thickness change portion having a thickness different from the thickness of other portions of the transmission cover portion.
The thickness change portion can be a portion thinner or thicker than other portions.

According to the present invention, it is possible to guide the transmission direction of transmission waves passing through the transmission cover portion without providing any other member.
More specifically, the permeability of radio waves passing through a resin cover changes depending on the thickness. Since the properties are not in a proportional relationship, the transmission cover section can be constructed without providing other members by configuring the direction guide means with a thickness having a low permeability compared to other sections having a thickness with a high permeability. can guide the direction of transmission of the transmitted wave through the .

Further, as an aspect of the present invention, the base body is made of a conductive member having conductivity, and the substrate edge portion of the antenna substrate is placed in the front and back direction at a location where the cover body and the base body are opposed to each other in the front and back direction. A sandwiching portion for sandwiching and fixing may be provided.

According to the present invention, the antenna substrate can be arranged with high accuracy with respect to the cover body that constitutes the radome.
More specifically, the radio wave-transmitting resin cover body covers the front surface of the antenna substrate, on which the antenna unit for transmitting and receiving radio waves is provided, at a predetermined distance. A sandwiching portion for sandwiching and fixing the substrate edge portion of the antenna substrate in the front-back direction is provided at a location facing the front-back direction with respect to the base member covering the cover body with a gap, so that the cover member and the base member are assembled. By constructing the housing in such a manner that the substrate edge portion of the antenna substrate is sandwiched between the sandwiching portions in the front and back directions, the antenna substrate can be assembled to the housing.

In this assembled state of the cover body and the base body, the substrate edge portion of the antenna board is sandwiched and fixed in the front and back direction by the sandwiching portions provided at locations facing each other in the front and back directions of the cover body and the base body. , the antenna substrate can be accurately arranged with respect to the cover body constituting the radome.

In addition, since the base body is made of a conductive member having conductivity, the base body functions as a shield member that prevents noise, and the cover body that constitutes the radome and the base body that constitutes the shield member. A housing that can prevent noise can be configured by the above. Therefore, the antenna device can be configured with a smaller number of parts than the conventional antenna device in which the antenna substrate is held by the shield member inside the housing composed of the cover body and the base body.

In addition, since the substrate edge of the antenna substrate is sandwiched between the sandwiching portion of the base body that is made of a conductive member and functions as a shield member and the sandwiching portion of the cover body, the base body that functions as a shield member and the Since the antenna substrate and the antenna substrate are reliably brought into contact with each other so as to be electrically conductive, the noise prevention effect as a shield member can be reliably exhibited.

Further, according to the present invention, there is provided a radar in which the above-described antenna device is arranged such that the direction in which the transmitting antenna section and the receiving antenna section are arranged in parallel is the vertical direction, and the wide-angle direction is the width direction orthogonal to the vertical direction. A device.
According to the present invention, a radar device with high detection accuracy can be configured by using an antenna device that efficiently achieves desired angular characteristics and a longer detection distance.

According to the present invention, it is possible to provide an antenna device and a radar device capable of improving the performances of a transmitting antenna section and a receiving antenna section having different directivities in accordance with the required radio wave characteristics.

1 is a perspective view of a radar device; FIG. FIG. 2 is an exploded perspective view of the radar device; FIG. 2 is an exploded perspective view from the front side of the antenna device; FIG. 2 is an exploded perspective view of the antenna device from the rear side; The front view of an antenna device. The AA arrow enlarged view of an antenna device. Explanatory drawing of a radio wave characteristic. A graph of the radio wave characteristics of the receiving cover. BB arrow enlarged view of the antenna device. Explanatory drawing of the radio wave characteristic of a transmission cover part. The schematic plan view which shows the mounting state of a radar apparatus.

1 shows a perspective view of the radar device 1, FIG. 2 shows an exploded perspective view of the radar device 1, FIG. 3 shows an exploded perspective view of the antenna device 10 from the front side, and FIG. 5 shows a front view of the antenna device 10, FIG. 6 shows an enlarged view of the antenna device 10 viewed from AA, and FIG. 7 shows an explanatory diagram of radio wave characteristics. 8 shows a graph of the radio wave characteristics of the reception cover portion 20A, FIG. 9 shows an enlarged view of the antenna device 10 viewed from arrow BB, FIG. 10 shows an explanatory diagram of the radio wave characteristics of the transmission cover portion 20B, and FIG. The schematic plan view which shows the mounting state of the radar apparatus 1 is shown.

More specifically, FIG. 7(a) is a graph showing radio wave characteristics according to cross-sectional shapes of the transmission cover portion 20B and the reception cover portion 20A provided on the cover body 20, and FIG. FIG. 8 is a graph showing the radio wave characteristics of the side slits 25, and FIG. 8 is a graph showing the radio wave characteristics depending on the position in the width direction W of the side slits 25 provided in the reception cover portion 20A.

FIG. 10(a) is a graph showing the radio wave characteristics of the lateral inclined surface 27 provided on the transmission cover portion 20B, and FIG. is a graph showing Furthermore, FIG. 11 shows only half of the vehicle 100 in the vehicle width direction.

Note that the height direction of the antenna device 10 (the vertical direction in FIG. 1) is defined as the vertical direction Z, the width direction of the antenna device 10 (the direction connecting the upper left and the lower right in FIG. 1) is defined as the width direction W, and the antenna device 10 (the direction connecting the lower left and the upper right in FIG. 1) is defined as the depth direction H. As shown in FIG. Furthermore, in the vertical direction Z, the upper side is the upper direction Zu, the lower side is the downward direction Zd, the front side (the lower left side in FIG. 1) is the front side Hf in the depth direction H, and the back side (the upper right side in FIG. side) is the back side Hb.

The radar device 1 is a small-sized radar device to be mounted on a vehicle. As shown in FIGS. 100 (see FIG. 11).

The mounting bracket 60 is a mounting member that detachably mounts the antenna device 10 having a substantially rectangular shape in a plan view. consists of

More specifically, the mounting bracket 60 is composed of a mounting portion 61 and a mounting portion 62, as shown in FIG.
The mounting portion 61 protrudes from a mounting portion 62 to be described later, has a semicircular tip, and has a bolt hole 611 formed on the tip side. The attachment point 61 is arranged so as to protrude in the upward direction Zu from the central portion in the width direction W of the short side of the upward Zu side of the rectangular attachment point 62, and is located below both the left and right long sides. They are slanted away from each other gradually from the direction Zd. In other words, the mounting points 61 are provided in three directions from the mounting points 62 formed in a substantially rectangular shape in plan view toward both sides of the width direction W of the upward direction Zu and the downward direction Zd.

The mounting portion 62 is composed of a bottom portion 63 , long side wall portions 64 , a lower wall portion 65 and an upper wall portion 66 .
The bottom surface portion 63 is formed in a substantially rectangular shape in a plan view so that the vertical direction Z and the width direction W are substantially the same as the antenna device 10 which is formed in a substantially rectangular shape in a plan view. It is configured to cover the bottom surface of the device 10 from below.

In addition, the bottom surface portion 63 is partially cut out in a U-shape and bent to form three plate springs 67 . The plate spring 67 is formed to extend in the upward direction Zu from the center portion in the vertical direction Z of the bottom portion 63 with the base end in the downward direction Zd. Both side leaf springs 672 are provided on both sides of the central leaf spring 671 in the width direction W so as to extend in the downward direction Zd from the vicinity of the central portion in the vertical direction Z as a base end.

The long-side sidewall portion 64 is a wall surface facing the long-side side surface of the antenna device 10 when assembled with the antenna device 10, and has a slide cutout portion 641 cut along the vertical direction Z. In addition, a bent portion 642 is provided by bending the upward direction Zu outward in the width direction W. As shown in FIG. A slide recess 643 that is partially recessed upward is formed in the slide cutout 641 . Note that the slide notch 641 is formed over the bent portion 642 .

The lower wall portion 65 is a wall surface facing the short-side side surface of the antenna device 10 in the downward direction Zd when assembled with the antenna device 10. A large notch portion 651 is cut out, and small notch portions 652 are formed in a substantially rectangular shape on both sides in the width direction W of the large notch portion 651 .

The upper wall portion 66 is erected on both sides in the width direction W of the mounting portion 61 arranged in the upward direction Zu. The height of the upper wall portion 66 is set to a length that does not interfere with the lower surface of the housing 10a of the antenna device 10 when the antenna device 10 and the mounting bracket 60 are assembled and assembled.

In addition, when the antenna device 10 and the mounting bracket 60 are assembled, the large cutout portion 651 is formed to have a size that allows the connector portion 22 of the antenna device 10 to be arranged, and the small cutout portion 652 is used to fix the antenna device 10 . The protrusion 37a is formed to have a size that allows it to be arranged.

The mounting bracket 60 configured as described above slides the antenna device 10, which will be described later, from the upward direction Zu of the mounting bracket 60, and the radar device 1 can be configured by mounting the housing 10a on the bottom surface portion 63. can. At this time, the antenna device 10 is assembled to the mounting bracket 60 so that the fixing convex portion 37b slides in the slide notch portion 641 formed in the bent portion 642 .

In this embodiment, the mounting bracket 60 as described above is used to construct the radar device 1 and mount it on the vehicle 100. However, the mounting bracket 60 may be mounted in an appropriate shape depending on the vehicle 100 itself to be mounted, the mounting location of the vehicle 100, or the like. It can be attached by brackets or any other suitable method.

The antenna device 10, which is attached to a predetermined location of the vehicle by the mounting bracket 60, is composed of the housing 10a composed of the cover body 20 and the base body 30, and the antenna substrate 40 arranged in the inner space of the housing 10a. It is configured.

The cover body 20 that constitutes the upper half of the housing 10a is made of resin that transmits radio waves, and has a peripheral edge portion 21 that protrudes downward along the peripheral edge of a substantially rectangular shape in a plan view and has a predetermined width and height. , and a cylindrical connector portion 22 projecting outward from the short side portion in the upward direction Zu of the peripheral edge portion 21 having a rectangular shape in plan view.

In the cover body 20 having a rectangular shape in a plan view, an upward direction Zu is a substantially dome-shaped receiving cover portion 20A projecting in a substantially arc shape in a side view, and a downward direction Zd is a transmitting cover portion 20B having a flat main surface. constitutes At the four corners of the cover body 20 in a plan view, fixing portions 201 for attaching fixing bolts 11 to be fixed to the base body 30 are provided.

The receiving cover portion 20A configured in the upward direction Zu of the cover body 20 has an arch shape projecting forward Hf in a cross section along the width direction W, that is, a cross section on a horizontal plane. A side slit 25 is provided extending to the .

The side slit 25 has a concave groove shape that is recessed toward the back side Hb on the surface of the reception cover portion 20A (the front side Hf surface of the cover body 20), leaving a predetermined thickness t1 (see the enlarged view of FIG. 6a). .
A recessed corner portion 26 formed by recessing a corner portion with the peripheral edge portion 21 is provided outside the side slit 25 in the reception cover portion 20A in the width direction W. As shown in FIG.

The transmission cover portion 20B configured in the downward direction Zd of the cover body 20 has a flat shape along the width direction W and the up-down direction Z, and has lateral inclined surfaces 27 on both sides in the width direction W. As shown in FIG.
As shown in the enlarged view of the b portion of FIG. 9, the lateral inclined surface 27 is configured to be inclined by a predetermined width toward the back side Hb with respect to the flat main surface 20Ba. In addition, in this embodiment, the lateral inclined surface 27 is inclined at an angle of about 11° toward the back side Hb with respect to the main surface 20Ba. A tapered surface 28 is provided at the corner between the side inclined surface 27 and the peripheral edge portion 21 .

In addition, as shown in FIG. 4, two inner recesses 29 having a predetermined width are arranged in the width direction W at a predetermined interval on the inner surface of the transmission cover portion 20B. The interval in the width direction W between the two inner recesses 29 corresponds to the interval between the two rows of the transmitting antenna units 432 in which the antenna batches 43a are arranged in a row, as will be described later. ing.

In addition, the reception cover unit 20A and the transmission cover unit 20B configured in this manner reflect radio waves (transmission waves) transmitted by a transmission antenna unit 432 constituting the antenna unit 43 described later and a detection target, and the reception antenna unit 431 It is configured with a thickness T through which radio waves (reflected waves) received by are easily transmitted.
In addition, the central portion of the reception cover portion 20A in the width direction W is configured to have approximately the same height as the main surface 20Ba of the transmission cover portion 20B on the front side Hf.

The connector part 22 has a cylindrical shape that is horizontally long and substantially rectangular when viewed from the front, and has a fitting/fixing part 221 on the upper surface thereof to be fitted and fixed to another connector. In addition, the connector portion 22 having a cylindrical shape that is horizontally long and substantially rectangular when viewed from the front is provided in such a manner that the lower half portion protrudes downward from the peripheral edge portion 21 . The connector portion 22 is not limited to the configuration described above, and may be configured in an appropriate shape according to another connector to be connected.

As shown in FIG. 4, the bottom surface of the cover body 20 is provided with a circumferential fitting convex portion 23 projecting downward inside the peripheral edge portion 21 in a plan view. The circumferential fitting projection 23 has a substantially V-shaped cross section as shown in FIG.

Further, as shown in FIG. 6, the bottom surface of the peripheral portion 21 is provided with a sandwiching portion 24 protruding downward in a generally frame-like shape when viewed from the bottom so as to correspond to the reception cover portion 20A. As shown in FIG. 4 , the sandwiching portion 24 has a U-shape in bottom view with an upward direction Zu open, and is formed in the shape of a peripheral wall on the inner side of the circumferential fitting convex portion 23 at a predetermined distance. .

The base body 30, which is assembled with the cover body 20 to form the lower half of the housing 10a, has a rectangular shape in plan view corresponding to the cover body 20, and has a predetermined height and width along the rectangular shape in plan view. A peripheral edge portion 31 is provided.

A fitting recess 32 into which the connector portion 22 is fitted is provided at the center of the short side in the upward direction Zu of the peripheral edge portion 31 which is rectangular in plan view. The peripheral edge portion 31 has rectangular corners chamfered inward, and fixing bolts 11 to be fixed to the cover body 20 corresponding to the fixing portions 201 are provided at the four corners outside the chamfered portion in the plan view. A fixing portion 301 for screwing is provided.

As shown in FIG. 3, a peripheral fitting projection 23 protruding downward from the vicinity of the peripheral edge of the cover body 20 is fitted in the vicinity of the center in the width direction of the peripheral edge 31 having a predetermined height and width. A fitting groove portion 34 having a U-shaped cross section is provided. The fitting groove portion 34 is formed with a depth and a cross-sectional shape such that the lower end of the circumferential fitting convex portion 23 does not come into contact with the groove bottom portion when fitting.

As shown in FIGS. 4 and 6, the fitting groove portion 34 is formed in the vicinity of the center in the width direction of the peripheral edge portion 31, and at the portion inside the fitting groove portion 34 in plan view, the bottom surface of the peripheral edge portion 21 has a substantially frame shape in bottom view. A sandwiching portion 35 vertically faces the sandwiching portion 24 projecting downward and sandwiches the antenna substrate 40 from above and below.

The base body 30 is made of a conductive member having conductivity so as to function as a shield member by electrically contacting the antenna substrate 40 described later. A GND frame portion 36 formed in a desired frame shape is provided so as to electrically contact a GND portion (not shown) surrounding the outer side of the antenna portion 43 of the antenna substrate 40 in plan view.

In addition, on both sides of the fitting recess 32 on the short sides in the upward direction Zu among the short sides of the rectangular shape in plan view, near the center of the long sides in the rectangular shape in plan view, and on the bottom surface, the mounting bracket 60 protrudes outward. A fixing convex portion 37 (37a, 37b, 37c) is provided to fix with. An engaging projection 371 that engages with the slide recess 643 of the slide notch 641 is provided on the upper surface of the fixed projection 37b provided near the center of the long side of the rectangular shape in plan view.

The cover body 20 and the base body 30 are assembled by inserting and fitting the circumferential fitting convex portion 23 of the cover body 20 configured in this way into the fitting groove portion 34 of the base body 30 . A housing 10a having an internal space surrounded by the base body 30 can be configured.

The antenna substrate 40 arranged in the internal space of the housing 10a configured by assembling the cover body 20 and the base body 30 has a predetermined thickness with an antenna section 43 for transmitting and receiving radio waves provided on the surface (surface). It is composed of a substrate 41 and a terminal portion 42 protruding outward from the back side of the substrate 41 (the surface on the back side Hb). A peripheral edge portion of the substrate 41 is referred to as a substrate peripheral edge portion 41a.

In more detail, the substrate 41 having the antenna portion 43 for transmitting and receiving radio waves on its surface is a printed circuit board that configures the antenna portion 43 with a printed pattern (not shown), and is formed in a rectangular shape in plan view with chamfered corners. is doing.

A terminal supporting portion 411 protruding outward is provided at the center of the short side portion of the substrate 41 (that is, the portion corresponding to the connector portion 22 of the cover body 20) which is rectangular in plan view with chamfered corners.

As shown in FIG. 4, the terminal portion 42 has a plurality of tabs 421 protruding outward (upward direction Zu) from the terminal support portion 411 along the back surface of the substrate 41 at predetermined intervals in the width direction W. The inner side (downward direction Zd) is penetrated in the thickness direction (depth direction H) of the substrate 41, and electrically connected to the above printed pattern.

The terminal portion 42 configured in this manner is inserted into the connector portion 22 of the cover body 20 described above, and electrically connected to terminals of another connector connected to the connector portion 22 . In this embodiment, the six tabs 421 constitute the terminal portion 42. However, the terminal portion 42 and the tabs 421 are not limited to the above-described configuration, and may be adapted according to other connectors to be connected. It may be configured with an appropriate shape and number.

The antenna unit 43 is configured by arranging a plurality of antenna batches 43a (also referred to as an array) in a matrix. Among the plurality of antenna batches 43a arranged in a matrix, the upward direction Zu on the substrate 41 constitutes the receiving antenna unit 431, A transmission antenna section 432 is configured in the downward direction Zd.

More specifically, in the upward direction Zu of the substrate 41, the antenna batches 43a are arranged in rows at predetermined intervals in the vertical direction Z, and four rows are arranged at predetermined intervals in the width direction W to form the receiving antenna units 431. constitutes

On the other hand, in the transmitting antenna section 432, the antenna batches 43a are arranged in a row with a predetermined interval in the vertical direction Z in the downward direction Zd of the substrate 41, and are wider than the interval in the width direction W in the receiving antenna section 431. They are arranged in two rows with a predetermined interval in the width direction W.

In this way, the antenna section 43 is composed of the receiving antenna sections 431 arranged in four rows in the upward direction Zu of the substrate 41 and the transmitting antenna sections 432 arranged in two rows in the downward direction Zd of the substrate 41. The six tabs 421 forming the terminal portion 42 are connected to each row formed by arranging the antenna batches 43a in the vertical direction Z. As shown in FIG.

Next, a method of assembling the antenna device 10 by assembling the cover body 20, the base body 30 and the antenna substrate 40 configured as described above will be described.
First, the antenna substrate 40 is attached to the cover body 20 .

As described above, the base member 30 is attached to the cover member 20 to which the antenna substrate 40 is attached, and the fixing portions 201 and 301 are fastened with the fixing bolts 11 to complete the attachment of the antenna device 10 .

At this time, the circumferential fitting convex portion 23 projecting downward from the peripheral edge portion 21 of the cover body 20 is inserted into the fitting groove portion 34 formed in the peripheral edge portion 31 of the base body 30 , and the connector is inserted into the fitting concave portion 32 . It is assembled in such a manner that the portion 22 is fitted.

Also, by assembling the cover body 20 with the antenna substrate 40 assembled and the base body 30 in a state where the top surface is in contact with the bottom surface of the sandwiching portion 24, the cover body 20 can be assembled as shown in the enlarged view of part a in FIG. Antenna board 40 can be attached to housing 10a constituted by cover body 20 and base body 30 by sandwiching portion 24 and sandwiching portion 35 of base body 30 from both sides in depth direction H.

In the antenna device 10 assembled in this way, the reception cover portion 20A having an arched cross section is arranged on the front side Hf of the reception antenna portion 431 of the antenna portion 43, and the flat transmission cover portion 20A is arranged on the front side Hf of the transmission antenna portion 432 of the antenna portion 43. A cover portion 20B is arranged. That is, the receiving antenna portion 431 and the receiving cover portion 20A having an arch-shaped cross section face each other in the depth direction H, and the transmitting antenna portion 432 and the flat transmitting cover portion 20B face each other in the depth direction H.

At this time, the receiving cover portion 20A and the transmitting cover portion 20B having the thickness T and the antenna portion 43 are arranged at intervals with high transmittance of transmitting waves and receiving waves. In other words, the antenna section 43 is arranged at intervals with high transmittance and high transmittance of transmission waves and reception waves with respect to the reception cover section 20A and the transmission cover section 20B having the thickness T. FIG.

In addition, as shown in FIG. 7(a), in the desired angle range (±60° range in this embodiment), only the upper part of the antennas arranged in two rows is in an arched shape (two-mountain arched shape). A reception cover portion 20A having an arch-shaped cross section facing the antenna portion 431 in the depth direction H has a high gain on the front side Hf, and a flat transmission cover portion 20B facing the transmission antenna portion 432 in the depth direction H has a wide-angle direction, that is, a width direction. It can be seen that the gain in the direction W is high.

6, the side slits 25 in the reception cover portion 20A are located further outside the width direction W of the four-row reception antenna portions 431 constituting the antenna portion 43 of the substrate 41. As shown in FIG. Since it is arranged outside and inside in the width direction W of the sandwiching portion 24, and is formed in a concave shape recessed from the surface to the back side Hb while leaving a predetermined thickness t1 on the back side Hb, it is outside the above-described desired angle range. (in this embodiment, the range of -180° to -60° and +60° to +180°) can be obtained.

More specifically, as shown in FIG. 7(b), a predetermined thickness t1 (about half the thickness T in this embodiment) is left on the back side Hb, and is formed in a concave shape that is recessed from the surface toward the back side Hb. For example, the side slit (No. 1) is recessed from the inner surface of the reception cover portion 20A toward the front side Hf leaving a thickness t1, or the inner surface of the reception cover portion 20A. , and the side slits (No. 3) having a shape recessed from the surface while leaving a thickness t1. ° to -60° and +60° to +180°).

Further, as shown in FIG. 8, the receiving antenna portions 431 are arranged further outside in the width direction W of the four-row receiving antenna portions 431 constituting the antenna portion 43 of the substrate 41 and inside the sandwiching portion 24 in the width direction W. With respect to the side slit 25 (No. 2C), the outermost side in the width direction W of the reception cover portion 20A, that is, the side slit (No. 2A) arranged instead of the concave corner portion 26 and the concave shape in the reception cover portion 20A. Compared to the side slit (No. 2B) continuously arranged inside the width direction W of the corner 26, the angle outside the above-mentioned desired angle range (-180 ° to -60 ° and +60 ° to +180° range) can be obtained.

In this way, the side slits 25 are arranged outside in the width direction W of the four-row configuration of the receiving antenna portion 431 constituting the antenna portion 43 of the substrate 41 and inside in the width direction W of the sandwiching portion 24. Since the thickness t1 is left on the depth side Hb and is recessed from the surface to the depth side Hb, a stable gain can be obtained outside the above-described desired angle range, and multi It is possible to suppress erroneous detection due to paths.

Further, in the assembled state described above, each of the inner surface concave portions 29 provided on the inner surface of the transmission cover portion 20B is arranged on the front side Hf of each row of the two rows of the transmission antenna portions 432, and is arranged on the outer side in the width direction W thereof. A lateral ramp 27 is provided. Therefore, the side inclined surface 27 is arranged outside in the width direction W from the transmitting antenna portions 432 arranged in two rows.

As described above, since the side inclined surface 27 is provided on the outer side of the transmission cover portion 20B in the width direction W, the transmission wave transmitted from the transmission antenna portion 432 is outside the above-described desired angle range (- 180° to -60° and +60° to +180°) can be suppressed.

More specifically, as shown in FIG. 10(a), when the transmitting cover portion 20B is not provided with the side inclined surface 27, that is, when the transmission cover portion 20B is composed only of the main surface 20Ba (no inclined surface), the angle is outside the above-described desired angle range. In contrast, the transmission wave transmitted from the transmission antenna section 432 is transmitted from the transmission antenna section 432 by providing the side inclined surface 27 on the outer side of the width direction W in the transmission cover section 20B (there is an inclined surface). It can be confirmed that the transmission outside the desired angular range of can be suppressed.

In addition, since the inner concave portion 29 is provided on the front side Hf of each row of the transmitting antenna portions 432 configured in two rows, the transmission of the transmission wave from the transmitting antenna portion 432 to the front side Hf is suppressed, and the width direction of the front side Hf is suppressed. A transmission wave can be transmitted in an oblique direction toward W.

More specifically, the transmittance of radio waves passing through the transmission cover portion 20B made of resin varies depending on the thickness as shown in FIG. The portion 20B is configured with a thickness T having high permeability, the inner concave portion 29 is configured with a thickness t2 smaller than the thickness T (in this embodiment, the thickness is about 1/3 to 2/3 of the thickness T), and the transmission antenna portion 432 Since the inner concave portion 29 is arranged on the front side Hf of each row, the transmission wave transmitted from the transmitting antenna portion 432 is less likely to pass through the inner concave portion 29, and is inclined in the width direction W with respect to the front side Hf. can be sent.

In addition, the antenna unit 43 configured by the receiving antenna units 431 configured in four rows and the receiving antenna units 431 configured in two columns, as described above, has the front side Hf and the width direction from each of the transmission antenna units 432 configured in two columns. A transmission wave is transmitted in an oblique direction of W, and the transmission wave transmitted from each row is reflected by the object to be detected and received as a reflected wave by the reception antenna unit 431 configured in four rows. 8 receiving antennas can be configured for each, and the resolution can be improved.

The antenna device 10 configured in this manner is assembled to the mounting bracket 60 as described above to configure the radar device 1. As the radar device 1, as shown in FIG. It is attached while being inclined outward in the width direction Js (45° in this embodiment). At this time, the receiving cover portion 20A of the antenna device 10 in the radar device 1 is mounted in the upward direction Zu, and the transmitting cover portion 20B is mounted in the downward direction Zd.

In this way, the antenna substrate 40 on which the transmitting antenna portion 432 for transmitting radio waves and the receiving antenna portion 431 for receiving radio waves are arranged side by side and provided on the surface (the surface on the front side Hf); The housing 10a is composed of a cover body 20 made of a resin that transmits radio waves and is spaced apart and covered, and a base body 30 disposed on the back side Hb of the antenna substrate 40. The cover body 20 includes a receiving antenna A portion facing the portion 431 is defined as a receiving cover portion 20A, and a portion facing the transmitting antenna portion 432 is defined as a transmitting cover portion 20B. In addition, the antenna device 10, which is formed in an arch shape in cross section along the width direction W of the transmission wave, and in which the transmission cover portion 20B is formed in a flat shape facing the surface of the antenna substrate 40, transmits according to the radio wave characteristics required for each. The performance of the antenna section 432 and the receiving antenna section 431 can be improved.

More specifically, in the cover body 20 that covers the surface of the antenna substrate 40 at a predetermined distance, the receiving cover portion 20A, which is the portion facing the receiving antenna portion 431 that receives radio waves, protrudes to the front side Hf of the transmitted wave. Because the transmission cover portion 20B, which is formed in an arch-shaped cross section along the width direction W of the transmission wave and faces the transmission antenna portion 432 that transmits radio waves, is formed in a flat shape facing the surface of the antenna substrate 40. , the radio wave characteristics of the radio wave transmitted through the facing portion of the cover body 20 are different between the transmission wave transmitted from the transmission antenna portion 432 and the reception wave reflected by the detection target and received by the reception antenna portion 431 .

Specifically, since the transmission cover portion 20B through which the transmission wave is transmitted is formed in a flat shape facing the surface of the antenna substrate 40, the detection distance of the transmission wave can be increased.
On the other hand, the receiving cover portion 20A through which the receiving wave passes protrudes to the front side Hf and is formed in an arch-like cross section along the width direction W of the transmitting wave. can be done.

Therefore, the transmitted wave reaches a distant object to be detected, and the reflected wave from a wide angle range can be received by the receiving antenna unit 431 as a received wave, so that the detection accuracy of the antenna device 10 can be improved.

In addition, since the receiving cover part 20A is provided with side slits 25 which are thinner than the other parts formed with the thickness T on both sides of the arched cross section, the receiving cover part 20A can receive signals from a range exceeding the desired angular range. It is possible to suppress the influence of waves, that is, to improve the angular characteristics of the receiving antenna section 431, to receive received waves from a desired angular range with high precision, and to detect a detection target.

Further, since the side slits 25 are formed by recesses provided on the surface of the reception cover portion 20A, the side slits 25 having the thickness T are formed by recesses provided on the inner surface of the reception cover portion 20A. Compared to the case (No. 1), the side slits 25 formed by the recesses provided on the surface further suppress the influence of the received waves from a range exceeding the desired angular range. can be further improved, the received waves from the desired angle range can be received with higher accuracy, and the detection target can be detected.

In addition, since the side slits 25 are provided outside in the width direction W of the portion facing the reception antenna section 431 in the width direction W, the desired angle range with respect to the reception antenna section 431 where the influence of the received waves is desired to be suppressed. can be set accurately.

In addition, since the transmission cover portion 20B is provided with side inclined surfaces 27 on both sides in the width direction W, the side inclined surfaces 27 intersect the direction of the main surface 20Ba constituting the flat shape and the front side Hf. Transmission of transmission waves to (back side Hb) can be suppressed.

More specifically, as shown in FIG. 11, since the radar device 1 is attached to the vehicle 100 facing the direction in which the object to be detected is desired to be detected, the vehicle 100 is behind the antenna device 10 (back side Hb). 10, the transmitted wave is reflected by the vehicle 100 to which the antenna device 10 is attached, and there is a risk of erroneous detection due to so-called multipath.

Therefore, side inclined surfaces 27 are provided on both sides of the transmission cover portion 20B in the width direction W so as to intersect the direction of the main surface 20Ba constituting the flat shape and the front side Hf, thereby allowing the transmission to the rear (back side Hb). Transmission can be suppressed. Therefore, erroneous detection due to reflection on the vehicle 100 to which the antenna device 10 is attached can be suppressed, and detection accuracy can be improved.

In addition, since the inner concave portion 29 that reduces the transmittance of the transmission wave is provided in the portion facing the transmission antenna portion 432 on the side facing the antenna substrate 40 of the transmission cover portion 20B, the transmission wave from the transmission antenna portion 432 is The front side Hf can be guided diagonally from the front of the antenna device 10 .

More specifically, as shown in FIG. 11, it is attached at a corner of the rear Jb of the vehicle 100 so as to be inclined outward in the vehicle width direction Js (45° in this embodiment). At this time, since the receiving cover portion 20A of the antenna device 10 in the radar device 1 is mounted in the upward direction Zu, and the transmitting cover portion 20B is mounted in the downward direction Zd, in addition to the rear Jb of the vehicle 100, the vehicle width direction of the vehicle 100 is also mounted. A detection target outside Js is also detected, but in this case, only one of the detection target behind Jb of the vehicle 100 and the outside of the vehicle 100 in the vehicle width direction Js can be detected.

On the other hand, by providing an inner recessed portion 29 that reduces the transmittance of the transmission wave in the portion facing the transmission antenna portion 432 on the side of the transmission cover portion 20B facing the antenna substrate 40, the transmission wave from the transmission antenna portion 432 is reduced. The front side Hf can be directed diagonally from the front of the antenna device 10, and by mounting the antenna device 10 obliquely at the corner of the rear Jb of the vehicle 100, in addition to the rear Jb of the vehicle 100, A detection target outside in the width direction Js can be detected.

In addition, since the inner concave portion 29 has a thickness t2 that is different from the thickness of other portions such as the main surface 20Ba of the transmission cover portion 20B, the transmission cover portion 20B does not need to be provided with other members. can guide the direction of transmission of the transmitted wave through the .

More specifically, the permeability of radio waves passing through the resin-made cover body 20 varies depending on the thickness. Since the permeability is not in a proportional relationship, other members are provided by configuring the inner surface recessed portion 29 with a thickness (t2) having a low permeability compared to other portions configured with a thickness (T) having a high permeability. It is possible to guide the transmission direction of the transmission wave that passes through the transmission cover portion 20B.

In addition, the base body 30 is made of a conductive member having conductivity, and the substrate edge of the antenna substrate 40 is sandwiched in the depth direction H and fixed to the locations of the cover body 20 and the base body 30 facing each other in the depth direction H. Since the substrate peripheral edge portion 41a is provided, the antenna substrate 40 can be accurately arranged with respect to the cover body 20 constituting the radome.

More specifically, the radio wave-transmitting resin cover body 20 and the back side Hb of the antenna substrate 40 cover the surface of the antenna substrate 40 on which an antenna unit for transmitting and receiving radio waves is provided at a predetermined distance. , and the substrate peripheral edge portion 41a for sandwiching and fixing the substrate edge portion of the antenna substrate 40 in the depth direction H is provided at a location opposed to the base member 30 covering the base member 30 at a predetermined interval in the depth direction H. 20 and the base body 30 are assembled to configure the housing 10a, the antenna substrate 40 can be assembled to the housing 10a by sandwiching the substrate edge portion of the antenna substrate 40 in the depth direction H with the substrate peripheral edge portion 41a.

In addition, when the cover body 20 and the base body 30 are assembled, the board edge part of the antenna board 40 is moved in the depth direction by the board peripheral edge part 41a provided at the position facing the depth direction H in the cover body 20 and the base body 30. Since the antenna substrate 40 is fixed by being sandwiched between H, the antenna substrate 40 can be accurately arranged with respect to the cover body 20 constituting the radome.

In addition, since the base body 30 is made of a conductive member having conductivity, the base body 30 functions as a shield member that prevents noise, and the cover body 20 that constitutes the radome and the base body 30 that constitutes the shield member. The housing 10a capable of preventing noise can be configured by the above. Therefore, the antenna device 10 can be configured with a smaller number of parts than the conventional antenna device 10 in which the antenna substrate 40 is held by the shield member inside the housing 10a composed of the cover body 20 and the base body 30. FIG.

In addition, since the substrate peripheral edge portion 41a of the base body 30 and the substrate peripheral edge portion 41a of the cover body 20 are sandwiched between the substrate peripheral edge portion 41a of the base body 30 and the substrate peripheral edge portion 41a of the cover body 20, which are made of a conductive member and function as a shield member, the antenna substrate 40 functions as a shield member. Since the base body 30 and the antenna substrate 40 are reliably brought into electrical contact with each other, the noise prevention effect as a shield member can be reliably exhibited.

In addition, since the radar device 1 is mounted on the vehicle 100 so that the direction in which the transmitting antenna unit 432 and the receiving antenna unit 431 are arranged side by side is the vertical direction Z and the width direction W is orthogonal to the downward direction Z, It is possible to efficiently exhibit the desired angular characteristics and increase the detection distance, thereby improving the detection accuracy.

In correspondence with the configuration of this invention and the above-described embodiments, the transmission antenna section of this invention corresponds to the transmission antenna section 432,
and so on,
The receiving antenna section corresponds to the receiving antenna section 431,
The antenna substrate corresponds to the antenna substrate 40,
The surface corresponds to the surface,
The cover body corresponds to the cover body 20,
The back side corresponds to the back side Hb,
The base body corresponds to the base body 30,
The housing corresponds to the housing 10a,
The reception cover section corresponds to the reception cover section 20A,
The transmission cover section corresponds to the transmission cover section 20B,
The antenna device corresponds to the antenna device 10,
The transmission direction corresponds to the front side Hf,
The wide-angle direction corresponds to the width direction W,
The thin portion corresponds to the side slit 25,
The outer side corresponds to the outer side in the width direction W,
The main surface corresponds to the main surface 20Ba,
the cross direction plane corresponds to the side inclined plane 27,
The direction guide means corresponds to the inner surface recess 29,
The thickness change portion corresponds to the inner surface recessed portion 29,
The vertical direction corresponds to the vertical direction Z,
The width direction corresponds to the width direction W,
The front and back direction corresponds to the depth direction H,
Although the sandwiching portion corresponds to the substrate peripheral portion 41a, the present invention is not limited to the configurations of the above-described embodiments, and many embodiments can be obtained.
For example, the above-described antenna section 43 is composed of the transmitting antenna section 432 configured in two columns and the receiving antenna section 431 configured in four columns. The number of columns is not limited, and may be configured with an appropriate number of columns.

Further, in the above description, in accordance with the interval (center-to-center distance in the width direction W) between each row (center-to-center distance in the width direction W) of the two-row configuration of the transmitting antenna units 432, the front side Hf of each row is spaced at the width direction W distance (center-to-center distance). However, for example, the width of the inner surface recessed portion 29 itself, the distance between the inner surface recessed portions 29 (center-to-center distance), or the position in the width direction W with respect to each row constituting the transmitting antenna portion 432 may vary depending on the position of attachment to the vehicle 100 and the It may be adjusted according to the orientation or desired range of gain.

The side slits 25 are arranged further outside in the width direction W of the four-row configuration of the receiving antenna portions 431 constituting the antenna portion 43 of the substrate 41 and inside in the width direction W of the sandwiching portion 24 . If a predetermined thickness t1 can be secured, not only the side slit 25 but also the inner surface and the surface of the reception cover portion 20A are recessed leaving the thickness t1. It may also be a side slit with a tapered shape.

Further, the lateral inclined surface 27 may be adjusted in length in the width direction W according to a desired angle range or the like, may be configured with a curved surface, or may be configured to protrude forward Hf. may
Furthermore, the inner recessed portion 29 may be configured by recessing the surface of the transmission cover portion 20B, or may be configured to be thicker than other portions as long as the thickness is low in radio wave transmittance.

Further, the receiving cover portion 20A was arch-shaped in a cross section along the width direction W, that is, in a cross section on the horizontal plane, and was configured by a curved line with a constant curvature projecting to the front side Hf, but was configured by a curved line with a varying curvature. Not only the arch shape, but also a substantially arch shape may be formed by changing the direction of the straight line along the cross-sectional direction. Furthermore, the arch shape on the surface side and the arch shape on the inner surface side may not be the same, and the thickness may be different so as to change. Further, as long as the cross section along the wide-angle direction is arch-shaped, the cross section of the reception cover portion 20A in the vertical direction Z intersecting the width direction W may be flat or curved.

Although the transmission cover portion 20B is configured as a flat plane along the width direction W and the vertical direction Z, it may be configured as a slightly curved surface, or arranged in a direction slightly inclined with respect to the antenna substrate 40. may be

In addition, although the fixed portion 201 provided on the cover body 20 and the fixed portion 301 provided on the base body 30 are fixed with the fixing bolts 11 to form the housing 10a, the cover body 20 and the cover body 20 are fixed by an appropriate method such as snap fitting. The housing 10a may be configured by fixing the base body 30. FIG.

Further, in the cover body 20, the receiving cover portion 20A facing the receiving antenna portion 431 is configured in an arch shape projecting to the front side Hf, and the transmitting cover portion 20B facing the transmitting antenna portion 432 is configured in a flat shape. In the receiving cover portion 20A facing the receiving antenna portion 431, an arch-shaped portion and a flat portion projecting to the front side Hf are provided, and the transmitting cover portion 20B facing the transmitting antenna portion 432 protrudes forward Hf A portion configured in an arch shape and a portion configured in a flat shape may be provided. As a result, the reception antenna unit 431 for receiving reception waves can have a plurality of radio wave characteristics, and the transmission antenna unit 432 can transmit transmission waves with different radio wave characteristics.

Although the radar device 1 in this embodiment is composed of the antenna device 10 for transmitting and receiving high-frequency radio waves, the antenna device 10 for transmitting and receiving other radio waves such as infrared radio waves may be used. It may be attached not only to bumpers but also to desired locations such as, for example, front bumpers, and may be attached to movable vehicles such as motorcycles, bicycles, trains, aircraft, and ships.

DESCRIPTION OF SYMBOLS 1... Radar apparatus 10... Antenna apparatus 10a... Case 20... Cover body 20A... Reception cover part 20B... Transmission cover part 20Ba... Main surface 20
25 Side slit 27 Side slope 29 Inner concave portion 30 Base body 40 Antenna substrate 41a Board periphery 431 Receiving antenna portion 432 Transmitting antenna portion H Depth direction Hb Back side Hf Front side W …Width direction Z …Vertical direction

Claims (9)

An antenna device for transmitting and receiving radio waves,
an antenna substrate on which a transmitting antenna section and a receiving antenna section having different directivities are arranged side by side;
The radio wave-transmitting resin cover body covers the front surface of the antenna substrate at a predetermined distance, and a housing composed of a base body arranged on the back side of the antenna substrate,
In the cover body, a portion facing the transmitting antenna portion is defined as a transmitting cover portion , and a portion facing the receiving antenna portion is defined as a receiving cover portion ,
the transmission cover portion is formed in a flat shape facing the surface of the antenna substrate;
The reception cover portion is formed in an arch-shaped cross section,
The arch-shaped cross-section is an arch-shaped shape projecting in the transmission direction of the radio waves, and further has a shape along the wide-angle direction of the transmitted radio waves.
antenna device. The reception cover part
2. The antenna device according to claim 1, wherein thin portions thinner than other portions are provided on both sides of said arch-shaped cross section. The thin portion is
3. The antenna device according to claim 2, wherein the concave portion is provided on the surface of the receiving cover portion . The thin portion is
4. The antenna device according to claim 2, wherein the antenna device is provided outside a portion facing the receiving antenna section in the wide-angle direction. The transmission cover section
5. The antenna device according to any one of claims 1 to 4, wherein cross direction surfaces are provided on both sides in the wide-angle direction in a direction along the main surface forming the flat shape and in a direction crossing the transmission direction. In a portion facing the transmitting antenna portion on the side of the transmitting cover portion facing the antenna substrate,
6. The antenna device according to any one of claims 1 to 5 , further comprising direction guiding means for guiding the main transmission direction of said radio waves to be transmitted. The direction guide means
7. The antenna device according to claim 6 , wherein the thickness change portion has a thickness different from that of other portions of the transmission cover portion. The base body is composed of a conductive member having conductivity,
At locations facing each other in the front and back directions of the cover body and the base body,
8. The antenna device according to any one of claims 1 to 7 , wherein a sandwiching portion is provided for sandwiching and fixing the substrate edge portion of the antenna substrate in the front-back direction. The antenna device according to any one of claims 1 to 8 ,
A direction in which the transmitting antenna section and the receiving antenna section are arranged side by side is a vertical direction,
A radar device mounted so that the wide-angle direction is a width direction perpendicular to the vertical direction.

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