JP2001257499A - Sub-millimetric wave or millimetric wave band radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of signals by fixing a partition plate between a radio section substrate and a shield case with no gap. SOLUTION: A partition plate 9 for partitioning signal lines A, B is secured to a shield case 2 by means of screws and the end of the shield case is secured to a substrate 1 by means of screws thus pressing the partition plate against the substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quasi-millimeter wave or millimeter wave band radio having a shield partition structure for a plurality of signal lines.

[0002]

2. Description of the Related Art In a radio receiver or a transceiver, a radio section of a wiring board is surrounded by a shield case to prevent interference due to penetration of external radio waves.

[0003] Some of the above-mentioned radio parts have a plurality of different signal lines, and it is necessary to prevent signal leakage if the signals transmitted by each signal line must not interfere with each other.

In order to prevent interference between the signal lines, the inside of the shield case is partitioned by a shield plate to isolate the signal lines.

[0005] A conventional shield partitioning structure of the radio section substrate will be described with reference to FIGS.

The radio unit substrate 1 has different signal lines A and B, and the signal lines A and B are surrounded by a shield case 2 entirely made of a material such as a copper plate. The shield case 2 has a top plate 3,
It is a flat container having a bottom and an opening, and is formed of a shielding material. An outer flange 4 is provided at the lower end of the side plate of the shield case 2 in a horizontal direction, and the outer peripheral edge of the outer flange 4 is bent downward by 90 ° to form a bent portion.

An elongated rectangular partition plate 5 is mounted at the center of the inside of the shield case 2, and the partition plate 5 is formed of a shield material of the same material as the shield case 2, and the height a of the partition plate 5 is The same size as the height b between the wireless unit substrate 1 and the ceiling of the shield case 2 is set, and the partition plate 5 is screwed to the top plate 3 at the upper end and the wireless unit at the lower end by screws 6. It is fixed to the substrate 1 by screws 8.

The shield case 2 is provided with the outer flange 4
The lower end of the partition plate 5 is fixed to the wireless unit substrate 1 by screws 7 from below the wireless unit substrate 1.
It is fixed by.

The bent portion of the outer flange 4 is brought into close contact with the radio section substrate 1, the two types of signal lines A and B are cut off from the outside by the shield case 2, and interference by external radio waves is prevented. Is prevented. The partition plate 5 is provided between the signal line A and the signal line B.
, And mutual signal leakage is prevented.

[0010]

The height a of the partition plate 5
Is designed to be equal to the distance b between the wireless unit substrate 1 and the shield case 2 (a = b), and the upper end and the lower end of the partition plate 5 are screwed to the top plate 3 and the wireless unit substrate 1. Therefore, the gap between the upper end of the partition plate 5 and the top plate 3 and the gap between the wireless unit substrate 1 and the lower end of the partition plate 5 are tightly adhered to each other, and the signal line A and the signal line B are mutually There is no signal leakage in between.

However, in reality, there are slight dimensional errors of the partition plate 5, dimensional errors of the side plate height of the shield case 2, bending of the top plate 3, or bending of the wireless unit substrate 1, and the like. 6, when the upper end and the lower end of the partition plate 5 are fixed by the screws 6 and 8 as shown in FIG.
The gap c and the gap d are generated by the fixing force of
And there is a possibility that a signal leaks from the gap d.

In particular, when the signal is in a quasi-millimeter wave band or a millimeter wave band, the signal easily leaks from the gaps c and d due to the wavelength, and the characteristics of the radio receiver or the transceiver may be deteriorated. .

When the upper end and the lower end of the partition plate 5 are not fixed by screws, there is no force to press between the partition plate 5 and the top plate 3 and between the partition plate 5 and the radio unit substrate 1. Therefore, a gap similar to that described above is created, and a signal leaks from the gap,
The characteristics of the wireless receiver or the transceiver may be degraded.

The present invention has been made in view of the above circumstances, and aims to prevent the signal from leaking by attaching a partition plate between the radio unit substrate and the shield case without any gap.

[0015]

According to the present invention, a partition plate for partitioning between signal lines and a shield case are screwed, and an end of the shield case and a substrate are screwed together.
The present invention relates to a quasi-millimeter wave or millimeter wave band wireless device in which the partition plate is pressed against the substrate, wherein the partition plate is sandwiched between the shield case and the wireless unit substrate, and the wireless unit substrate and the partition The partition plate and the shield case are pressed against each other, and the quasi-millimeter wave or the millimeter wave band signal is prevented from leaking.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, the same components as those in FIGS. 4 to 6 are denoted by the same reference numerals.

The radio unit substrate 1 has different signal lines A and B at predetermined intervals, and the signal lines A and B are entirely surrounded by a shield case 2. The shield case 2 has a top plate 3 and is a flat container having a bottom and an opening, and is formed of a shield material. An outer flange 4 is provided around the lower end of the side plate of the shield case 2 in the horizontal direction.
Is bent downward by 90 ° to form a bent portion.

An elongated rectangular partition plate 9 is mounted at the center of the inside of the shield case 2, and the partition plate 9 is formed of a shield material. The height e of the partition plate 9 is equal to that of the radio unit substrate 1 and the shield. The height of the case 2 up to the ceiling b (see FIG. 6) is slightly higher, for example, about 0.5 mm. The partition plate 9 is fixed to the top plate 3 by screws 6 at the upper end.

The shield case 2 includes the outer flange 4
In this embodiment, the lower end of the partition plate 9 is fixed to the wireless unit substrate 1 between the signal lines A and B by pressure.

The operation will be described below.

The partition plate 9 is fixed to the shield case 2 by the screw 6 in advance.

The shield case 2 and the partition plate 9 are integrally placed on the radio unit substrate 1 so as to cover the entire signal line A and the signal line B.

The shield case 2 is connected to the outer flange 4
In the above, the screw is fixed to the wireless section substrate 1 by the screw 7.

The signal line A and the signal line B are surrounded by the shield case 2 to prevent interference by external radio waves.

The height e of the partition plate 9 is equal to the height of the wireless unit substrate 1.
Is slightly higher than the height b up to the shield case 2, for example, about 0.5 mm. Therefore, when the outer flange 4 is fixed to the radio unit substrate 1 with the screw 7, the radio unit substrate 1 The lower end of the partition plate 9 is pressed and the upper end of the partition plate 9 is pressed against the top plate 3.

Thus, both ends of the partition plate 9 are in close contact with the radio unit substrate 1 and the shield case 2, so that the signal lines A and B are completely isolated from each other, and a quasi-millimeter wave Alternatively, leakage of a signal in the millimeter wave band is prevented, and the signal line A and the signal line B enable transmission as designed.

Further, the lower end of the partition plate 9 and the wireless unit substrate 1
Since the screw fixing with the above is unnecessary, the shield case 2
Can be easily attached and detached, the number of assembly steps is reduced, and convenience is improved.

The quasi-millimeter-wave or millimeter-wave band radio of the present invention is not limited to the above-described embodiment, and three or more signal lines may be divided by a plurality of partition plates. Needless to say, the partition plate may be fixed to either the shield case or the wireless unit substrate.

[0030]

As described above, according to the present invention, the partition plate for partitioning between signal lines and the shield case are screwed, and the end of the shield case and the substrate are screwed, so that the partition plate is formed by the aforementioned method. When pressed against the substrate, the adhesion is enhanced, signal leakage is reliably prevented, and it is particularly useful for quasi-millimeter wave or millimeter wave band signals, and secure transmission is performed. Further, since screw fixing between the wireless unit substrate and the lower end of the partition plate is not required, attachment and detachment of the shield case is facilitated, and assembling steps are reduced, and various advantages such as improved convenience are achieved. It has the effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a shield case and a partition plate in the embodiment.

FIG. 3 is a cross-sectional view when the shield case and the partition plate are attached to the radio unit substrate in the embodiment.

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a plan view of a wireless unit substrate in the conventional example.

FIG. 6 is a detailed sectional view of a portion C in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio | wireless part board 2 Shield case 3 Top plate 6 Screw 7 Screw 9 Partition plate A Signal line B Signal line b Height between a radio part substrate and a shield case e Height of a partition plate

Claims (1)

[Claims] 1. A partition plate for separating between signal lines and a shield case are screwed together, and an end of the shield case and a substrate are screwed together to press the partition plate against the substrate. Millimeter wave or millimeter wave band radio.