JP2023007161A - Transceiver - Google Patents

Abstract

To further suppress unnecessary radio waves to enable target detection in the vicinity.SOLUTION: The present disclosure relates to a transceiver that comprises: a substrate in which an antenna plane having a transmission antenna and reception antenna mounted is arranged in a rear plane of a component packaged plane having an electric power supply line path to the transmission antenna and reception antenna mounted; and a housing that contacts with a ground conductor arranged in the component packaged plane, and covers the electric power supply line path, in which a distance from the component packaged plane having the electric power supply line path arranged to a ceiling plane of the housing is less than half a wavelength to be transmitted from the transmission antenna.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a transmitting/receiving device that transmits/receives radio signals.

Techniques for suppressing unnecessary radio waves in a transmitting/receiving apparatus have been proposed (see, for example, Patent Document 1). In Patent Literature 1, unnecessary radio waves are suppressed by placing a partition plate between signal lines to isolate the radiation source of the unnecessary radio waves.

However, in the configuration where the partition plate is placed between the signal lines, the transmission line and the reception line cannot be completely separated, and the amount of unnecessary radio wave suppression is insufficient to detect a nearby target, resulting in false detection or non-detection. was a factor.

JP-A-2001-257499

An object of the present disclosure is to further suppress unwanted radio waves and enable target detection in the vicinity.

The present disclosure further suppresses unnecessary radio waves by setting the distance between the substrate surface of the radiation source of the unnecessary radio waves and the housing to less than λ/2.

Specifically, the transmitting/receiving device of the present disclosure includes:
a substrate on which an antenna surface on which a transmitting antenna and a receiving antenna are mounted is arranged on the back surface of a component mounting surface on which a feeder line to the transmitting antenna and the receiving antenna is mounted;
a housing that contacts the ground conductor arranged on the component mounting surface and covers the power supply line;
A transmitting/receiving device comprising
A distance from the component mounting surface on which the feed line is arranged to the ceiling surface of the housing is less than half the wavelength transmitted from the transmitting antenna.

According to the present disclosure, it is possible to further suppress unnecessary radio waves and detect a target in a closer vicinity.

1 shows a cross-sectional configuration example of a transmitting/receiving device; 2 shows a configuration example of an antenna surface of a transmitting/receiving device; 4 shows a configuration example of a component mounting surface of a transmitter/receiver; A configuration example of the A-A' cross section of the housing is shown. An example of the configuration of the B-B' cross section of the housing is shown. 4 shows a configuration example of a wall provided in a housing. 4 shows a configuration example of a wall provided in a housing. 4 shows a configuration example of a wall provided in a housing. 1 shows a configuration example of a transmitting/receiving device of the present disclosure; A comparative example in which the transmitting/receiving device of the present disclosure is applied to a millimeter wave radar is shown. A cross-sectional configuration of a comparative example is shown. An embodiment in which the transmitting/receiving device of the present disclosure is applied to a millimeter wave radar will be shown.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. In addition, in this specification and the drawings, constituent elements having the same reference numerals are the same as each other.

(First embodiment)
FIG. 1 shows a configuration example of a transmission/reception device. The transmitting/receiving device according to this embodiment includes the housing 10 on the component mounting surface 61P of the substrate 61 . A transmitting antenna 72 and a receiving antenna 74 are mounted on the antenna surface 61A of the substrate 61 . A component mounting surface 61P of the substrate 61 is mounted with a feeding line 62 from an MMIC (Monolithic Microwave Integrated Circuit) to a transmitting antenna 72 and a feeding line 64 from a receiving antenna 74, as well as circuit components such as the MMIC.

The housing 10 is a metal housing such as aluminum die-cast. A ground conductor 66 is mounted on the component mounting surface 61</b>P, and the walls 11 , 14 and 31 extending from the housing 10 are grounded by contacting the ground conductor 66 .

2 and 3 show configuration examples of the antenna surface 61A and the component mounting surface 61P. As shown in FIG. 2, a transmitting antenna 72 and a receiving antenna 74 are mounted on the antenna surface 61A. As shown in FIG. 3, the component mounting surface 61P is mounted with a feed line 62 and a feed section 63 from the MMIC 53 to the transmitting antenna 72, and a feed line 64 and a feed section 65 from the receiving antenna 74 to the MMIC 53. The feeder lines 62 are equal-length wirings that do not cross each other. As with the feeder line 62, the feeder line 64 is also an equal-length wiring that does not cross each other. The ground conductor 66 is mounted in a region 52T in which the feeder line 62 is mounted and in a region 52R in which the feeder line 64 is mounted. The cross-sectional configuration shown in FIG. 1 corresponds to the B-B' cross section shown in FIG.

FIG. 4 shows a configuration example of the A-A' cross section. The feeding section 63 is connected to the transmitting antenna 72 via a via 73 penetrating through the antenna surface 61A. The feeding section 65 is connected to the receiving antenna 74 via a via 75 penetrating through the antenna surface 61A. As a result, power is supplied from the component mounting surface 61P to the antenna surface 61A.

When a transmission signal is supplied from the power supply unit 63 to the transmission antenna 72 , unnecessary radio waves are radiated from the power supply unit 63 toward the housing 10 , causing a small amount of radio wave leakage and being reflected by the housing 10 . At this time, if the distance to the reflecting surface is less than half the wavelength of the radio wave, multiple reflection can be suppressed. Therefore, in the present disclosure, the distance D _52T from the component mounting surface 61P to the ceiling surface of the housing 10 in the area 52T where the feeder line 62 is mounted is set to less than 1/2 of the wavelength transmitted from the transmitting antenna 72. . As a result, the transmitting/receiving apparatus according to the present embodiment suppresses unnecessary radio waves emitted from the power feeding section 63 toward the housing 10 .

Any method may be used to control the distance D _52T from the component mounting surface 61P to the ceiling surface of the housing 10 . For example, as shown in FIG. 1, by increasing the thickness T _52T of the housing 10, it is possible to make it less than half the wavelength transmitted from the transmitting antenna 72. FIG. Further, as shown in FIG. 5, by recessing the upper surface of the housing 10, the wavelength may be less than 1/2 of the wavelength transmitted from the transmitting antenna 72. FIG.

Although this embodiment showed an example in which the transmitting antenna 72 and the receiving antenna 74 are connected to one MMIC 53, the present disclosure is not limited to this. For example, regions 52T and 52R may be arranged at separate positions. As a result, it is possible to easily suppress unnecessary radio waves that reach the power supply unit 65 for reception from the power supply unit 63 .

(Second embodiment)
When a transmission signal is supplied from the power feeding unit 63 to the transmitting antenna 72 , unnecessary radio waves are radiated in all directions from the power feeding unit 63 and are reflected by the side surfaces of the housing 10 . Therefore, in the present embodiment, the housing 10 is provided with walls so as to suppress radio waves that are reflected by the side surfaces of the housing 10 and received by the power supply unit 65 for reception.

FIG. 6 shows a configuration example of the housing 10 according to this embodiment. The housing 10 includes walls 11 , 12 , 13 , 14 that surround the feed line 62 to the transmitting antenna 72 and function as transmitting antenna surrounding walls. As a result, unnecessary radio waves from the power supply unit 63 are confined within the region 52T, and unnecessary radio waves reflected within the housing 10 can be suppressed.

The housing 10 also includes walls 11 , 31 , and 32 that surround the feed line 64 to the receiving antenna 74 and function as receiving antenna surrounding walls. As a result, unnecessary radio waves reaching the power supply unit 65 for reception can be suppressed.

(Third Embodiment)
In the second embodiment, the feeder line 62 is connected to the MMIC 53, and unnecessary radio waves may leak out of the walls 11, 12, 13, and 14 from this connection. Therefore, the housing 10 of this embodiment includes a wall functioning as an intermediate wall in the region 52T. This makes it difficult for unnecessary radio waves to reach the MMIC 53, so that unnecessary radio waves leaking from the MMIC 53 can be further suppressed.

For example, as shown in FIG. 7, a wall 21 is provided between the feeder 63 and the MMIC 53 . Also, the wall 15 may be arranged along the connection surface of the MMIC 53 to the feeder line 62 . Also, the wall 11 may be arranged along the connection surface of the MMIC 53 to the feeder line 62 . By arranging the walls 11 and 15 along the connection surface of the MMIC 53 to the feeder line 62 , unnecessary radio waves can be prevented from passing through the MMIC 53 .

The arrangement and shape of the wall 21 are arbitrary. For example, like the wall 21, the wall 21 may be arranged on the same straight line parallel to the x-axis direction in which the power supply sections 63 are arranged. Also, the wall may be a wall extending perpendicularly to the x-axis direction. Further, as shown in FIG. 8, the power supply portions 63 may be separated from each other by walls.

(Fourth embodiment)
The transmitting/receiving device of the present disclosure suppresses unnecessary radio waves from the power supply unit 63 received by the power supply unit 65 for reception. Therefore, it can be applied to a wide variety of transmission/reception devices in which the antenna surface 61A is arranged on the back surface of the component mounting surface 61P.

For example, the transmitting/receiving device of the present disclosure can be applied to millimeter wave radar using millimeter wave band radio waves. Millimeter-wave radar is a device that measures the distance, speed, direction, reception strength, etc. to a target by radiating radio waves in the millimeter-wave band toward a target and measuring the reflected waves from the target. be. In this case, in the transmitting/receiving device of the present disclosure, the antenna surface 61A is covered with a radome 51 as shown in FIG.

A comparative experiment example in which the transmitting/receiving device of the present disclosure is applied to a millimeter wave radar will be shown. FIG. 10 shows a comparative example of the present disclosure, and FIG. 12 shows a case where the configuration of the present disclosure is adopted. Specifically, in the comparative example of FIG. 10, as shown in FIG. 11, the walls 11, 12, 13, and 14 shown in FIG. _52T is more than half the wavelength transmitted from the transmit antenna 72. FIG. 12 includes the walls 11, 12, 13, and 14 shown in FIG. 7, and the distance from the component mounting surface 61P to the ceiling surface of the housing 10 (symbol D _52T shown in FIG. 1) is defined by the transmitting antenna. less than half the wavelength transmitted from 72.

In the comparative example shown in FIG. 10, the influence of multiple reflection within the housing 10 extends to around 5 m. Therefore, the received signals of the target TGT1 near 2.8 m and the target TGT2 near 4.6 m contain noise, and the received signal smaller than the received intensity of the multiple reflections is buried in the multiple reflections and cannot be detected. In contrast, in the embodiment shown in FIG. 12, the influence of multiple reflection within the housing 10 can be shortened to around 1.5 m. Therefore, the noise of the targets TGT1 and TGT2 is removed, and the target TGT3 near 1.8 m can be detected. Therefore, by applying the transmitting/receiving device of the present disclosure to a millimeter wave radar, it is possible to suppress unwanted radio waves to the extent that a target in the vicinity of less than 2 m can be detected.

In the present disclosure, by setting the distance from the component mounting surface 61P to the ceiling surface of the housing 10 to less than 1/2 of the wavelength transmitted from the transmitting antenna 72, any wavelength band, not limited to millimeter wave band radio signals radio signals.

The present disclosure can be applied to the information and communications industry.

10: Housings 11, 12, 13, 14, 15, 21, 31, 32: Walls 53: MMIC
61: Substrate 62: Feeding line for transmission 63: Feeding part for transmission 64: Feeding line for reception 65: Feeding part for reception 66: Ground conductor 72: Transmission antenna 73: Via 74 of feeding part for transmission: Receiving Antenna 75: Feeder Via for Receiving

Claims (4)

a substrate on which an antenna surface on which a transmitting antenna and a receiving antenna are mounted is arranged on the back surface of a component mounting surface on which a feeder line to the transmitting antenna and the receiving antenna is mounted;
a housing that contacts the ground conductor arranged on the component mounting surface and covers the power supply line;
A transmitting/receiving device comprising
The distance from the component mounting surface on which the feeder line is arranged to the ceiling surface of the housing is less than 1/2 of the wavelength transmitted from the transmitting antenna.
transmitter and receiver. A transmission circuit for generating a transmission signal from the transmission antenna is mounted on the component mounting surface,
The housing includes a transmitting antenna surrounding wall that surrounds a feed line to the transmitting antenna except for a connection portion with the transmitting circuit,
The transmitting/receiving device according to claim 1. The feed line to the transmitting antenna includes a transmitting antenna feeding section from the component mounting surface to the antenna surface,
An intermediate wall is provided in the area surrounded by the transmitting antenna surrounding wall to prevent unnecessary radio waves from being transmitted from the transmitting antenna feeding unit to the transmitting circuit.
The transmitting/receiving device according to claim 2. A receiving circuit for receiving a signal received by the receiving antenna is mounted on the component mounting surface,
The housing includes a receiving antenna surrounding wall surrounding a feed line to the receiving antenna except for a connection portion with the receiving circuit,
The transmitting/receiving device according to any one of claims 1 to 3.

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