JP4821472B2 - Antenna structure - Google Patents

Description

  The present invention relates to an antenna structure applied to a communication device such as a mobile phone and a data communication card.

  Various communication devices such as mobile phones and data communication cards are provided with antennas. As an example of an electronic circuit device with an antenna, one formed by transferring and molding a transfer film having an antenna pattern on the surface of a housing has been proposed (see Patent Document 1). Further, as an example of a portable wireless device using an antenna, as shown in FIG. 8, an antenna radiating element portion 30 formed of sheet metal and fixed to a case has been proposed (see Patent Document 2). .

  The portable wireless device shown in FIG. 8 is formed by disposing the radiating element portion 30 on the rear case 33, and the radiating element portion 30 is formed with a plurality of holes 34 at intervals. The positioning projection 35 provided on the rear case 33 is fitted into the hole 34 of the radiating element 30 to position the radiating element 30. The radiating element 30 is rear-mounted by a double-sided tape 32. It is fixed to the case 33.

JP-A-9-199940 Japanese Patent Laid-Open No. 10-163748

  Incidentally, in recent years, with the reduction in size and height of communication devices, there is a demand for thinner antennas provided in the communication devices. Therefore, it is conceivable to apply a thin plate-like antenna formed of a thin sheet metal or the like as described above to a communication device. However, when the width of an element forming the antenna is narrow, as described above, the radiation element section 30 is used. It is difficult to form the hole 34 in the hole. For this reason, it has been difficult to dispose a narrow and thin antenna in a state of being accurately positioned so as not to be deformed. If the antenna is deformed, for example, the antenna performance may deviate from the design value, or a part of the adjacent element part may contact and short-circuit, resulting in the reliability of the communication device. It will damage the sex.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to accurately position and arrange a thin plate-like antenna even if it is narrow, thereby providing a communication device including the antenna. It is an object of the present invention to provide an antenna structure that can improve reliability.

In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention is
A thin plate-like antenna with a saddle-shaped part is arranged on the surface of the flat part of the housing,
The antenna has a capacitive coupling portion in which the entire surface of the thin plate-like plate surface is a radio wave radiating element, and the radiating element portion facing through the gap of the saddle-shaped portion of the antenna is capacitively coupled through the gap. And
A lid member that covers the surface of the planar portion of the casing is provided on the casing,
Said at least one side surface of the plane portion of the planar surface opposite to the surface of the flat portion of the housing and the housing at least part of the gap between the capacitive coupling portion of the hook-shaped portion of the antenna of the lid member A positioning convex portion for positioning the gap between the saddle-shaped portions by fitting is provided.

In addition, the second invention,
A thin plate antenna with a saddle-shaped part is arranged on the surface of the housing,
A lid member that covers the surface of the housing is provided on the housing,
A concave shape or a through-hole for fitting a dielectric constant adjusting member to at least a part of a gap of the saddle-shaped portion of the antenna is provided on at least one side of the surface of the lid member facing the housing surface and the housing surface. One or more hole-like fitting portions are provided, and the dielectric constant adjusting member is fitted to at least one of the fitting portions,
The dielectric constant adjusting member also serves as a gap positioning member for positioning a gap in the saddle-shaped portion of the antenna.

In the present invention, the saddle-shaped portion of the antenna is provided on at least one side of the surface of the housing on which the thin plate-shaped antenna having the saddle-shaped portion is disposed and the surface of the lid member that covers the surface of the housing that faces the housing surface. In the case where a positioning convex portion that fits in at least a part of the gap of the capacitive coupling portion is provided, the positioning of the saddle-shaped portion can be accurately performed by the positioning convex portion.

  Further, in the present invention, the antenna flange is provided on at least one side of the surface of the casing on which the thin plate-shaped antenna having the bowl-shaped portion is disposed and the surface of the lid member that covers the casing surface facing the casing surface. In the case where one or more concave or through-hole-shaped fitting portions for fitting the dielectric constant adjusting member to at least a part of the gap of the mold part are provided, the dielectric constant adjusting member fitted into the fitting portion is used. It is possible to accurately position the gap in the saddle type part.

  As described above, according to the present invention, since the gap positioning of the saddle-shaped portion of the antenna can be accurately performed, it is possible to prevent the saddle-shaped portion of the antenna from being deformed and the gap from becoming narrow and short-circuiting. The antenna can be accurately held by being sandwiched between the housing and the lid member.

  In addition, in the case where one or more fitting portions for fitting the dielectric constant adjusting member are provided in at least a part of the gap of the saddle-shaped portion of the antenna, the dielectric constant adjusting member fitted into the fitting portion is used. The characteristics of the antenna can be adjusted, and the performance such as the resonance frequency of the antenna can be adjusted.

  Furthermore, in the present invention, the fitting portion or positioning of the positioning member for positioning the outer edge portion of the saddle-shaped part of the antenna on at least one side of the surface of the lid member facing the housing surface and the housing surface In the case where the convex portion is formed, the outer edge side of the saddle-shaped portion of the antenna is positioned by the positioning member fitted to the fitting portion or the positioning convex portion. It can prevent more reliably and can arrange | position an antenna correctly.

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

  FIG. 1A shows a schematic exploded perspective view of a first embodiment of an antenna structure according to the present invention in a state of being incorporated in a data communication card as a communication device. FIG. 1B shows a cross-sectional view taken along the line AA in the assembled state. A data communication card to which the antenna structure of this embodiment is applied is used by being detachably inserted and fitted into a card slot provided in a personal computer or the like, for example.

  In this embodiment, a thin plate-like antenna 3 having a thickness of 0.1 mm is arranged on the surface 9 of the extended portion 10 of the resin casing 2, and the surface 9 of the casing 2 is placed on the casing 2. A cover member 5 such as a decorative plate is provided, and the cover member 5 is fixed to the housing 2 by leaf springs 17 provided on both sides thereof. A positioning projection 7 having substantially the same shape and size as the gap 8 of the bowl-shaped portion 4 of the antenna 3 is formed on the surface 6 of the lid member 5 facing the housing surface 9. The positioning convex portion 7 is used for positioning the gap of the saddle-shaped part 4 by fitting in at least a part of the gap 8 of the saddle-shaped part 4 of the antenna 3 (substantially the entire region here). The embodiment is characterized in that the positioning convex portion 7 is provided to perform the gap positioning of the saddle-shaped portion 4.

  In this embodiment, the antenna 3 includes a radiating element portion 11 having a wide width and a radiating element portion 21 having a narrow width and a width of 1 mm or less. Capacitive coupling is configured through the gap 8. Two holes 13 are formed in the radiating element 11 with a space therebetween, and a projection 14 that fits into the hole 13 is provided on the surface 6 of the lid member 5 that faces the housing surface 9. ing.

  Further, the extended portion 10 of the housing 2 is formed so that its height is higher than other portions, and this extended portion 10 is disposed so as to protrude from the slot when the data communication card is inserted into the slot. Is done. A circuit board 1 is accommodated in the housing 2, and one end side of the antenna 3 is suspended from the surface of the housing 2 and connected to a feeding point 12 of the circuit board 1. An antenna matching circuit 24, an RF circuit 15, and a baseband 16 are connected in order to the feeding point 12, and the antenna 3 is configured so that the radiating element portions 11 and 21 create a resonance state by feeding from the feeding point 12. Perform the action.

  The present embodiment is configured as described above, and when the housing 2 is covered with the lid member 5 and fixed, the protruding portion 14 of the lid member 5 of the radiating element portion 11 is formed as shown in FIG. The radiating element portion 11 is positioned by fitting into the hole portion 13. Further, since the positioning projection 7 of the lid member 5 is fitted and positioned in the gap 8 of the antenna 3, the antenna 3 can be accurately held between the housing 2 and the lid member 5.

  Next, a second embodiment will be described. FIG. 2A shows a schematic exploded perspective view of the antenna structure of the second embodiment in a state incorporated in a data communication card, and FIG. B cross-sectional view is shown.

  The second embodiment is configured in substantially the same manner as the first embodiment, and the second embodiment is different from the first embodiment in that the positioning projection 7 of the lid member 5 is characteristic. In addition, a plurality of through-hole-shaped fitting portions 20 penetrating to the upper surface of the lid member 5 are provided at intervals, and the dielectric adjusting member 22 is fitted into one of the fitting portions 20. In addition, as shown in FIG.2 (c), the fitting part 20 may form in the concave shape of the opening facing the housing | casing 2 (not shown in the figure). The dielectric constant adjusting member 22 is formed of a suitable insulating material such as resin, and a plurality of dielectric adjusting members 22 may be provided as necessary.

  The second embodiment can also achieve the same effects as the first embodiment. Further, in the second embodiment, the resonance frequency of the antenna 3 can be adjusted by the dielectric adjustment member 22, so that the antenna 3 is fitted in the fitting portion 20 on the lid member 5 side even if the pattern of the antenna 3 is the same. The performance of the antenna 3 can be varied by appropriately changing the type and number of the dielectric adjusting members 22.

  The present invention is not limited to the above embodiments, and can take various forms. For example, in each of the above embodiments, the positioning convex portion 7 is formed on the lid member 5, but the positioning convex portion 7 may be formed on the surface 9 of the housing 2 as shown in FIG. You may form in both the surface 6 of the member 5, and the surface 9 of the housing | casing 2. FIG. In the example shown in FIG. 3, a protrusion 14 is formed on the surface 9 of the housing 2, and a recess 19 for fitting the protrusion 14 and the positioning protrusion 7 are formed on the surface 6 of the lid member 5. And a recess 18 for fitting.

  Moreover, in each said embodiment, although the positioning convex part 7 was fitted to the substantially whole area | region of the clearance gap 8 of the saddle-shaped site | part 4 of the antenna 3, it shows, for example in FIG. 4 (a), (b) As described above, a plurality of positioning convex portions 7 may be arranged with a space therebetween, and may be partially fitted into the gap 8 (at least partially fitted).

  Furthermore, as shown in FIGS. 5A to 5C, without providing the positioning convex portion 7, at least one side of the surface 6 of the housing 2 and the surface 6 of the lid member 5 facing the housing surface, One or more concave or through-hole-shaped fitting portions 20 for fitting the dielectric constant adjusting member 22 may be provided in at least a part of the gap 8 of the saddle-shaped portion 4 of the antenna 3. The dielectric constant adjusting member 22 may be fitted to at least one of the fitting portions 20, and the dielectric constant adjusting member 22 may also serve as a gap positioning member that performs gap positioning of the saddle-shaped portion 4 of the antenna 3. .

  Furthermore, as shown in FIG. 6A, for example, a positioning member fitting portion 26 for positioning the outer edge portion of the saddle-shaped portion 4 of the antenna 3 is provided on the surface 9 of the housing 2, The positioning member 28 may be fitted to the fitting portion 26. Moreover, as shown in FIG. 6B, a positioning convex portion 27 for positioning the outer edge portion of the saddle-shaped portion 4 of the antenna 3 may be provided on the surface 9 of the housing 2. Further, the fitting portion 26 and the positioning member 28 and the positioning convex portion 27 may be provided on the surface 6 of the lid member 5 facing the housing surface 9, or provided on both the surface 6 and the housing surface 9. Also good.

  As described above, when the outer edge portion side of the saddle-shaped portion 4 of the antenna 3 is positioned by the positioning member 28 fitted to the fitting portion 26 or the positioning convex portion 27, the saddle-shaped portion 4 of the antenna 3 is more accurately identified. Can be positioned and held.

  Further, as shown in FIG. 7A, a concave portion 25 for fitting the antenna 3 is provided on the surface 9 of the housing 2, and the antenna 3 is fitted into the concave portion 25 as shown in FIG. 7B. It is good also as an aspect. In this case, the housing 2 on the outer edge side of the concave portion 25 functions as a positioning convex portion 27 for positioning the outer edge portion side of the saddle-shaped portion 4 of the antenna 3, and the portion of the housing 2 formed between the concave portions is the antenna. 3 functions as a positioning projection 7 for positioning the gap of the saddle-shaped portion 4.

  Further, in each of the above embodiments, the antenna 3 is formed such that the thickness of the radiating element portion 11 of the bowl-shaped portion 4 is larger than the thickness of the radiating element portion 12. Any of them may be formed as thin as about 1 mm. Further, the shape of the antenna 3 is not particularly limited as long as it has the bowl-shaped portion 4.

  Further, in each of the above embodiments, the extended portion 10 of the housing 2 is formed to be bulkier than other portions, and the antenna 3 is disposed on the extended portion 10. For example, the end of the data communication card having a uniform thickness is provided. It is good also as a structure which provides the antenna 3 in a part.

  Further, in each of the above embodiments, the example in which the present invention is applied to the data communication card has been described. However, the antenna structure of the present invention can be variously applied as an antenna structure provided in other communication devices such as a mobile phone. It is what is done.

It is typical explanatory drawing for demonstrating the antenna structure of the example of 1st Embodiment. It is typical explanatory drawing for demonstrating the antenna structure of the example of 2nd Embodiment. It is typical explanatory drawing for demonstrating the antenna structure of the other embodiment. It is sectional drawing which shows the example of the cover member (a) applied to the antenna structure of the other embodiment examples, and a housing | casing (b), respectively. It is sectional drawing which shows the example of the cover members (a) and (b) and the housing | casing (c) which are applied to the antenna structure of further another embodiment. Furthermore, it is a top view which shows the example of antenna arrangement | positioning to the housing | casing applied to the antenna structure of other example embodiments. Furthermore, it is a perspective view for demonstrating the example of antenna arrangement | positioning to the housing | casing applied to the antenna structure of other embodiment examples. It is explanatory drawing which shows the antenna periphery structure in the portable radio | wireless machine proposed by Unexamined-Japanese-Patent No. 10-163748.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Housing | casing 3 Antenna 4 Vertical part 5 Lid member 6 Surface 7 Positioning convex part 9 Surface 10 Extend part 12 Feeding point 20 Fitting part 22 Dielectric constant adjusting member 27 Positioning convex part

Claims (3)

A thin plate-like antenna with a saddle-shaped part is arranged on the surface of the flat part of the housing,
The antenna has a capacitive coupling portion in which the entire surface of the thin plate-like plate surface is a radio wave radiating element, and the radiating element portion facing through the gap of the saddle-shaped portion of the antenna is capacitively coupled through the gap. And
A lid member that covers the surface of the planar portion of the casing is provided on the casing,
Said at least one side surface of the plane portion of the planar surface opposite to the surface of the flat portion of the housing and the housing at least part of the gap between the capacitive coupling portion of the hook-shaped portion of the antenna of the lid member An antenna structure characterized in that a positioning convex portion for positioning a gap of the saddle-shaped portion by fitting is provided. A thin plate antenna with a saddle-shaped part is arranged on the surface of the housing,
A lid member that covers the surface of the housing is provided on the housing,
A concave shape or a through-hole for fitting a dielectric constant adjusting member to at least a part of a gap of the saddle-shaped portion of the antenna is provided on at least one side of the surface of the lid member facing the housing surface and the housing surface. One or more hole-like fitting portions are provided, and the dielectric constant adjusting member is fitted to at least one of the fitting portions,
The antenna structure according to claim 1, wherein the dielectric constant adjusting member also serves as a gap positioning member for positioning a gap in the saddle-shaped portion of the antenna. On the surface of the lid member facing the housing surface and at least one side of the housing surface, a fitting portion or a positioning convex portion of the positioning member for positioning the outer edge portion of the saddle-shaped portion of the antenna is formed. ,
3. The antenna structure according to claim 1, wherein an outer edge portion side of the saddle-shaped portion of the antenna is positioned by a positioning member fitted to the fitting portion or the positioning convex portion.

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