JP2563531Y2 - Thin radio - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thin radio device such as a portable small radio device, a radio paging receiver, etc., and particularly comprises a coil-loaded inverted-F antenna in a housing. Related to thin wireless devices.

[Conventional technology and its problems]

A small antenna such as a conventional paging receiver is provided separately from a receiver housing, and a loop antenna, an inverted-F antenna, or the like is used.

However, a small loop antenna is an antenna with extremely low efficiency because of its small radiation resistance, and the directivity of the loop antenna depends on the shape of the loop.

In addition, since the gain of a loop antenna depends on its loop area, the shape and dimensions of the built-in case naturally limit the cross-sectional area of the loop. The loss of gain cannot be avoided.

In a thin (card-shaped) receiver, etc.,
With such a loop antenna or inverted F-shaped antenna, there is a limit that can be made thin.

Therefore, the applicant of the present invention has provided a plate-shaped small antenna which has a small size, a light weight, a thin shape, and a selective operation of a good efficiency and a directional characteristic as compared with the conventional type. Two rectangular plate-shaped conductor plates are arranged in parallel at a sufficiently small interval compared to the wavelength, and an insulating frame is disposed between opposing sides of the two conductor plates. A small antenna in which an arbitrary position on one side is used as a feeding point, and at least one arbitrary point on the other side of both conductor plates is short-circuited with a conductor to form a plate-like loop, is disclosed in Japanese Patent Application No. Sho 63 (1988). -7
No. 5352 has already been proposed.

In this small antenna, a radio device case is composed of two conductor plates arranged in parallel at a sufficiently small interval compared to the wavelength and an insulating frame arranged between opposing sides of the two conductor plates. A plate-shaped loop is formed by the two conductor plates that are formed and arranged in parallel, and a conductor that short-circuits (connects) any one or more points on the sides of the two conductor plates. The configuration can also serve as a wireless device case, so that both the efficiency and the directional characteristics can be improved as compared with the conventional built-in loop antenna, and downsizing can be realized. Since the miniaturization can be realized, the effect on the miniaturization, light weight, and thinness (card shape) of the miniature portable radio is not only very large, but also the short-circuit point of the two conductor plates is set to an arbitrary point on the side. By changing the loop antenna, the directivity characteristics of the antenna can be changed, and the gain of the loop antenna can be increased as compared with the built-in loop antenna.

However, in this small antenna, it is difficult to install an insulating frame between the opposing sides of the two conductive plates while keeping the two conductive plates parallel. It is difficult to connect to a power supply point of a functional circuit of a radio device which is housed inside an arbitrary position as a power supply point, and a conductor that short-circuits between any one or more points on the other side of both conductive plates is required. There are problems such as being exposed to the outside and becoming a structural weak point.

[Means for solving the problem]

In order to solve the above-mentioned problem, the radio device of the present invention has a printed circuit board 5 mounted on an insulating housing frame 4 as shown in FIG.
And the radiation plate and housing structure plate 1 of the inverted-F antenna is mounted on one surface of the insulating housing frame 4 and the ground plate and housing structure plate 2 of the inverted-F antenna is mounted on the other surface. , Reverse F
A loading coil 9 for forming a rectangular antenna is arranged so that electrical insulation is maintained between the radiation plate / housing structure plate 1 and the printed circuit board 5, and one end of the loading coil 9 is connected to a connection point. 8 is connected to the radiation plate / casing structure plate 1 and the other end is electrically connected to the ground plate / casing structure plate 2 at the ground pattern portion.
To the connection point on the ground pattern of the printed circuit board which is short-circuited to the loading coil 9 which constitutes an inverted-F antenna together with the radiation plate / housing structure plate 1 and the ground plate / housing structure plate 2. A feed point 10 is provided at a point of good antenna efficiency and directional characteristics, and the connection point 8 and the feed point 10 are connected,
The power supply point 10 is connected to a high-frequency input unit or an output unit of a wireless device formed on the printed circuit board by a cable, a circuit pattern, or other connection means.

[Action]

With such a configuration, the radiation plate and housing structure plate 1 of the inverted-F antenna, the ground plate and housing structure plate 2 of the inverted-F antenna, the loading coil 9 for the inverted-F antenna configuration, and the insulator A housing and an inverted F-shaped antenna are formed with the housing frame 4 made of the same. In the frame 4, a feeding point 8 of the radiation plate and housing structure plate 1 of the inverted F-shaped antenna and a feeding point 10 of the loading coil 9 are provided. Since the printed circuit board 5 on which the functional components of the wireless device to which the antenna is connected is mounted is housed, an inverted-F antenna having a small size, light weight, thin shape, and having better antenna efficiency and directional characteristics than the conventional type is provided. It is possible to provide a thin wireless device provided with the wireless communication device.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially exploded perspective view showing the configuration of an embodiment of the wireless device of the present invention, FIG. 2 is an external perspective view thereof, and FIG. 3 is a perspective view of main parts thereof. This embodiment is an example applied to a radio pager.

In FIG. 1, reference numeral 1 denotes a housing structure plate also serving as a radiation plate of an inverted-F antenna, and 2 denotes a housing structure plate also serving as a ground plate of the inverted-F antenna. Aesthetic processing such as display as a receiver is performed by painting or the like. 3
Is a housing structure plate connected to the radiation plate and housing structure plate 1 of the inverted F-shaped antenna with a connection insulator 11, and electrically connected to the ground plate and housing structure plate 2 of the inverted F-shaped antenna. In some cases, it may be floating from the main plate / housing structure plate 2.

Reference numeral 4 denotes a housing frame made of an insulating material. On one surface thereof, a radiating plate / housing structure plate 1 of an inverted-F antenna and a housing structure plate 3 adhered thereto via a connecting insulator 11 are provided. For example, a screw 13 is attached to the other surface, and a ground plate / casing structure plate 2 of the inverted-F antenna is attached to the other surface with an adhesive or the like.

Reference numeral 5 denotes a printed circuit board on which a functional component circuit for operating as a receiver is mounted. The printed circuit board 5 is bonded to the base plate / housing structure plate 2 of the inverted-F antenna, or the base plate / housing structure is formed by the insulating housing frame 4. It is mounted in a form pressed against the plate 2. Reference numerals 8 and 10 designate feeding points between the loading coil 9 of the inverted F-shaped antenna of the printed circuit board 5 and the radiation plate and housing structure plate 1 of the inverted F-shaped antenna. It is connected by attaching. FIG. 3 shows the structure of the coil-loaded inverted-F antenna according to the present invention.

Reference numeral 6 denotes a power supply battery unit for operating the receiver, which is configured to be detachable from the battery storage unit 12 of the insulator casing frame 4 in the figure. To the ground plate / housing structure plate 2 and the printed circuit board 5.

7 is a decorative plate for aesthetic processing such as display as a receiver,
For example, a decorative adhesive sheet is attached to the surfaces of the radiation plate and housing structure plate 1, the housing structure plate 3, and the connection insulator 11 of the inverted-F antenna. The radiation plate and housing structure plate 1 of the inverted F-shaped antenna and the ground plate and housing structure plate 2 of the inverted F-shaped antenna are made of conductive metal or resin whose surface is subjected to conductive plating. An inverted F-shaped antenna is composed of the loading coils 9 and 1,2.

The structure shown in FIGS. 1 and 2 is a structure in which the housing structure plates 1 and 3 are attached to the insulating housing frame 4 with screws 13 in consideration of the maintainability of the internal circuit of the printed circuit board 5. However, it is also possible to perform this by bonding, and to perform an aesthetic process such as display directly as a receiver on the surfaces of the two housing structural plates 1 and 3 by painting or the like.

It has been confirmed that the structure of the present invention is very effective in making a receiver having a thin structure using frequencies in the VHF and UHF bands.

[Effect of the invention]

As described above, according to the present invention, the printed circuit board 5 is housed in the insulating housing frame 4, and the radiating plate / casing structure plate 1 of the inverted-F antenna is provided on one surface of the insulating housing frame 4.
On the other side, the ground plate and housing structure plate of the inverted-F antenna 2
And the feeding point 8 of the radiation plate / housing structure plate 1 of the inverted F-shaped antenna and the feeding point 10 of the loading coil 9 of the printed circuit board 5 for forming the inverted F-shaped antenna are connected. The radiation plate and housing structure plate 1 of the inverted F antenna, the ground plate and housing structure plate 2 of the inverted F antenna, the loading coil 9 for the inverted F antenna configuration, and the insulating housing frame 4 A housing and an inverted F-shaped antenna can be formed.
The printed circuit board 5 on which the functional components of the wireless device in which the feeding point 8 of the radiation plate and housing structure plate 1 of the inverted F antenna is connected to the feeding point 10 of the loading coil 9 is mounted. It is possible to provide a thin radio device equipped with an inverted F-shaped antenna having a small size, light weight, thin shape, and having better antenna efficiency and directional characteristics as compared with the conventional type. It is easy to mount the base plate / housing structure plate 2 in parallel with the insulating material housing frame 4 while maintaining the parallelism. The feeding point 8 of the radiation plate / housing structure plate 1 and the inverted F-shaped antenna of the printed circuit board 5 The advantages are that the connection of the feeding point 10 of the configuration loading coil 9 is simple, that no short-circuit conductor or the like is required outside the housing, and that there is no portion that is a structural weak point.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing the configuration of an embodiment of the wireless device of the present invention, FIG. 2 is an external perspective view thereof, and FIG. 3 is a perspective view of main parts thereof. 1 ... radiation plate / casing structure plate of inverted F-shaped antenna 2 ... ground plate / casing structure plate of inverted F-shaped antenna 3 ... casing structure plate
4 ... Insulator case frame, 5 ... Printed circuit board, 6 ... Power supply battery section, 7 ... Decorative board (decorative adhesive sheet), 8 ... Power supply point, 9 ... Loading coil, 10 ... Power supply point, 11: Connection insulator, 12: Battery storage section.

Claims (1)

(57) [Scope of request for utility model registration] 1. A printed circuit board (5) is placed in a housing (4) made of an insulating material.
A radiating plate and housing structure plate 1 of the F-shaped antenna and a ground plate and housing structure plate 2 of the inverted F-shaped antenna are mounted on the other surface so as to face each other.
The loading coil 9 for configuring the inverted F-shaped antenna is arranged so that electrical insulation is maintained between the radiation plate / housing structure plate 1 and the printed circuit board 5, and one end of the loading coil 9 is disposed. A connection on the ground pattern of the printed circuit board, which is connected to the radiation plate / housing structure plate 1 at a connection point 8 and the other end is electrically short-circuited to the ground plate / housing structure plate 2 at the other end. Connected to a point, the radiation plate and housing structure plate 1
A feed point 10 is provided at a point of good antenna efficiency and directional characteristics on the loading coil 9 constituting the inverted F-type antenna together with the ground plate and the housing structure plate 2, and the connection point 8 and the feed point 10 are connected. A cable between the power supply point 10 and a high-frequency input unit or output unit of a wireless device configured on the printed circuit board,
Alternatively, the thin wireless device is connected by a circuit pattern or other connection means.