JP2002190746A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve antenna characteristic by protecting an antenna from the main cause of antenna characteristic deterioration by a transmission and reception circuit. SOLUTION: An antenna substrate 3 is placed on supporting parts 41a, 41b, 41c and 41d provided at a case part 4 and supported by a main surface 3b to be positioned. That is, the substrate 3 is supported so that the surface 3b of the substrate 3 and the edge part of the part 4 may be on the same surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device, and more particularly, to an antenna device for protecting an antenna element from a high-frequency transmitting / receiving circuit.

[0002]

2. Description of the Related Art In recent years, it has been possible to transmit and receive data and the like without the need for troublesome wired connections by connecting electronic devices by wireless communication. Such wireless data transmission has a higher error rate than wired data transmission, so it is necessary to eliminate factors that hinder data transmission.

[0003] In particular, in an antenna device capable of performing such wireless communication, the transmission / reception circuit is shielded from the antenna element so as not to detect noise of an electromagnetic wave generated from the transmission / reception circuit of the antenna device.

The conventional antenna device 100 includes a front cover 110, an antenna substrate 120, a case 130, and a back cover 140, as shown in FIG. The front cover 110 includes fitting portions 110a, 110b, and 11 that are folded on each side of the main surface perpendicularly to the main surface.
0c and a shielding portion 111.

[0005] The antenna substrate 120 has support portions 131a and 13a protruding toward the inside of the side surface of the case 130.
It is positioned by being supported by 1b, 131c and 131d.

[0006] The case portion 130 is formed so as to project toward the inside of the case frame at the vertex of the edge portion 4 on the lower surface, and has side surfaces 135a and 135b, 135b and 135c, 135c and 135
d, a connecting portion 133a connecting 135d and 135a,
133b, 133c and 133d are provided integrally with the side surface. The case portion 130 is a substantially rectangular parallelepiped having upper and lower surfaces opened, and is formed by folding the side surfaces 135a to 135d upward from the connecting portions 133a to 133d.

The front cover 110 covers the high-frequency transmitting / receiving circuit 121 area of the antenna substrate 120 supported by the supporting portions 131a, 131b, 131c, and 131d of the case portion 130, exposing the antenna element 122, and Fitting part 1 between 110c and case part 130
By being fitted with 32a to 132c, the antenna board is sandwiched and fixed between the case section 130 and the case section 130. In this way, the front cover 110 protects the antenna element 122 from high frequency or the like which is a factor that degrades the antenna characteristics generated from the high frequency transmitting / receiving circuit 121 by the shielding portion 111.

[0008]

However, in the conventional antenna device 100, the antenna substrate 120 is provided with the support portion 1 protruding toward the inside of the side surface of the case portion 130.
Because it was positioned by 31a to 131d,
The main surface of the antenna substrate 120 on which the antenna element 122 is mounted is flush with the edge of the case 130 or is supported at a position lower than the edge. In this case, FIG.
As shown in (1), the antenna element 122 disposed on the antenna substrate 120 is slightly shielded by the edge of the case 130, and there is a problem that the directivity of the antenna is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide an antenna device that improves antenna characteristics while protecting the high-frequency transmission / reception circuit from adverse effects on antenna elements. Aim.

[0010]

In order to achieve the above object, an antenna device according to the present invention has a substantially rectangular main surface, and is folded on each side of the main surface perpendicularly to the main surface. A first cover member having a fitted fitting portion and a shielding portion, wherein the length in the short direction is substantially the same as the length in the short direction of the first cover member, and the length in the long direction is small. It is formed as a substantially rectangular shape that is larger than the length in the longitudinal direction of the first cover member,
A transmitting and receiving circuit is disposed on one main surface, and an antenna substrate on which an antenna is disposed on one short side on one main surface, and the length in the short direction and the longitudinal direction is substantially the same as the antenna substrate. And
An upper surface and a lower surface of a substantially rectangular parallelepiped having a predetermined thickness are formed as frames each having an open side surface, and four apexes of one of the edges have a support portion projecting toward the inside of the frame. A frame member having a fitting portion on one short side and both long sides of the portion, and supporting the antenna substrate on a main surface different from one main surface at a support portion provided on the frame member. Positioning the antenna substrate, covering the transmission / reception circuit of the antenna substrate, exposing the antenna, and fitting the first cover member and the frame member at the fitting portion to hold the antenna substrate with respect to the frame portion. With the configuration, the transmitting / receiving circuit protects the antenna from a factor that degrades the antenna characteristics and improves the antenna characteristics.

[0011]

Embodiments of the present invention will be specifically described below with reference to the drawings. In the antenna device according to the present invention, the antenna element 122 is positioned such that the main surface of the antenna substrate on which the antenna and the transmission / reception circuit are disposed is flush with the edge of the frame member. Since the antenna is supported at a higher position, the antenna characteristics can be improved.

An antenna device 1 shown as an embodiment of the present invention comprises a front cover 2, an antenna substrate 3, a case portion 4, and a back cover 5, as shown in FIG. The front cover 2 has a substantially rectangular main surface 2a,
Each side of the main surface 2a has fitting portions 21a, 21b, and 21c folded perpendicularly to the main surface, and a shielding portion 22. In the present embodiment, the following fitting portion includes a convex portion,
It is formed so that the fitting hole provided in the corresponding position may fit.

The length of the antenna substrate 3 in the short direction is substantially the same as the length of the front cover 2 in the short direction, and the length in the long direction is larger than the length of the front cover 2 in the long direction. It is formed in a certain substantially rectangular shape, and a high-frequency transmitting / receiving circuit 32 and an antenna element 31 are arranged on one main surface 3a. The high-frequency transmitting / receiving circuit 32 is a transmitting / receiving circuit that enables communication using a high-frequency band. Also, the antenna element 31
In the present embodiment, for example, a ceramic antenna element is used.

The case portion 4 has a length in the short direction and a length direction substantially equal to the length of the antenna substrate 3 and is formed as a side portion having a predetermined thickness and a substantially rectangular parallelepiped having upper and lower surfaces opened. Support portions 41a, 41b, 41c and 4 projecting toward the inside of the case frame at the four vertices of the edge
1d. In addition, the case portion 4 has three fitting portions 42a, 4 at one short side and both long sides of one edge portion.
2b and 42c, and fitting portions 43a, 4
3b, 43c and 43d.

The back cover 5 has a substantially rectangular main surface 5a whose length in the short direction and the long direction is substantially the same as the length of the antenna substrate 3, and each side of the main surface 5a is provided with respect to the main surface. Fitting portions 51a, 51b, 51c and 51 folded vertically
d, and the fitting portions 43a, 43b, 43c and 43d
And protects the back surface of the antenna device 1.

In constructing the antenna device 1 from the above-described components, the antenna substrate 3 is positioned by being supported by the main surface 3b on the support portions 41a, 41b, 41c and 41d provided on the case portion 4. I have.
That is, the antenna substrate 3 is supported such that the main surface 3b of the antenna substrate 3 and the edge of the case portion 4 are on the same plane. Thus, the projection protrudes at least by the thickness of the antenna substrate. Therefore, as shown in FIG. 2, the directivity of the antenna element 31 of the antenna device 1 is improved as compared with the conventional antenna device. Also, the support portion 41
Since a, 41b, 41c, and 41d are also connecting portions for turning the side surfaces 44a to 44d of the case portion 4 back to form a substantially rectangular shape, the case structure is simplified and the manufacturing cost is reduced.

Further, the front cover 2 is composed of a high-frequency transmitting / receiving circuit 3 of the antenna substrate 3 supported on the main surface 3b by the supporting portions 41a, 41b, 41c and 41d of the case portion 4.
2 area and the antenna element 31 is exposed,
Fitting portions 42a to 42c of 1a to 21c and case portion 4
Thus, the antenna substrate is sandwiched and fixed between the case portion 4. Thereby, the front cover 2
The shield part 22 protects the antenna element 31 from high-frequency waves and the like that cause deterioration of antenna characteristics generated from the high-frequency transmitting / receiving circuit 32.

Further, in the front cover 2, the fitting portion is formed by processing a part of the side surfaces 44a, 44b and 44c of the case portion 4 into a shape extending upward, thereby reducing the number of parts and the material cost. It becomes possible to reduce.

Although not shown, the antenna device 1 may be provided with another circuit configuration for performing transmission / reception or the like inside the case portion 4. Also in this case, sufficient directivity of the antenna element 32 is ensured by being shielded by the front cover 2 and the case 4.

The antenna device 1 is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. As an application example of the antenna device 1, the antenna device 1 can be used for an antenna device for so-called Bluetooth or the like. Bluetooth is short-range wireless communication using radio waves in the 2.4 GHz band standardized by Ericsson (Sweden). In Bluetooth, the maximum transfer rate is 1 Mbit / sec, and the modulation method is GFS
K (Gaussian Frequency Shift Keying), the maximum transmission distance is 10m (output: 1mW) and 100m (output: 100m)
W), which can be selected depending on the application.

[0021]

As described above in detail, the antenna device according to the present invention has a substantially rectangular main surface, and the fitting portion folded on each side of the main surface perpendicularly to the main surface. A first cover member having a first cover member and a shielding portion;
Is formed as a substantially rectangular shape having a length substantially the same as the length in the short direction of the cover member and a length in the long direction being larger than the length in the long direction of the first cover member. A transmitting / receiving circuit is provided, and an antenna board on which an antenna is provided on one short side on one main surface, the length in the short direction and the long direction is substantially the same as the antenna board, and a predetermined thickness is provided. The upper surface and the lower surface of the substantially rectangular parallelepiped are formed as a frame composed of side portions that are open, and have a support portion that is convex toward the inside of the frame at four vertices of one edge portion. A frame member having a fitting portion on one short side and both long sides thereof, and the antenna substrate is supported by a supporting portion provided on the frame member on a main surface different from one main surface to form the antenna substrate. The first antenna is positioned so as to cover the transmitting / receiving circuit of the antenna substrate and expose the antenna. It is constructed by sandwiching the antenna substrate to the frame portion by fitting the cover member and the frame member in the fitting portion.

Therefore, according to the antenna device of the present invention, it is possible to improve the antenna characteristics while protecting the high-frequency transmission / reception circuit from the adverse effect of deteriorating the antenna characteristics of the antenna element.

Further, by processing a part of the side surface of the frame member to form a fitting portion for fitting with the first cover member, the number of parts is reduced, and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of an antenna device shown as an embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating directivity of an antenna of the antenna device shown as an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a configuration of a conventional antenna device.

FIG. 4 is a diagram schematically illustrating the directivity of an antenna of a conventional antenna device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna device 2 front cover 2a main surface 3 antenna substrate 3a main surface 4 case portion 5 back cover 5a main surface 31 high-frequency transmitting / receiving circuit 32 antenna element 41a support portion 41b support portion 41c support portion 41d support portion

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H04M 1/02 H04M 1/02 C

Claims (1)

[Claims] A first cover member having a substantially rectangular main surface, and having a fitting portion and a shielding portion folded on each side of the main surface perpendicularly to the main surface; A substantially rectangular shape in which the length in the hand direction is substantially the same as the length in the short direction of the first cover member, and the length in the longitudinal direction is larger than the length in the longitudinal direction of the first cover member. An antenna substrate in which a transmitting / receiving circuit is disposed on one main surface, and an antenna is disposed on one short side of the one main surface; A support having substantially the same length as the substrate and having a substantially rectangular parallelepiped having a predetermined thickness, and formed as a frame having side surfaces with opened upper and lower surfaces, and having four apexes on one edge projecting toward the inside of the frame. And a frame member having fitting portions on one short side and both long sides of the one edge portion. The antenna substrate and positioning the antenna substrate by supporting a different major surface and the one main surface in the support portion provided on the frame member,
The first cover member and the frame member are fitted in the fitting portion so as to cover the transmission / reception circuit of the antenna substrate and expose the antenna, thereby clamping the antenna substrate with respect to the frame portion. An antenna device comprising: