JP2000261226A - Receiver for individual call, and structure and method for holding loop antenna therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a loop antenna holding structure which suppresses deformation due to an impact even when being directly attached to a printed circuit board and can improve the antenna gain in a high frequency band. SOLUTION: This structure is provided with a loop antenna 1 which is formed like a loop and has an antenna junction part 12 joined to a printed circuit board 2 in the vicinity of the center of this loop, the printed circuit board 2 provided with one or more positioning parts 21 to position the loop antenna 1 and one or more soldered land parts 22 which are provided in vicinities of positioning parts and are electrically connected to the joined loop antenna, and an inductance element 3 connected in parallel to the loop antenna 1, and the antenna junction part 12 is built in positioning parts 12 to suppress deformation due to an impact, and the antenna gain in a high frequency band is improved by the inductance element 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an individual paging receiver and a loop antenna holding structure and method thereof, and more particularly to an individual paging receiver capable of suppressing deformation due to impact and improving the antenna gain in a high frequency band. The present invention relates to a receiver and its loop antenna holding structure and method.

[0002]

2. Description of the Related Art As a conventional method for holding a loop antenna in an individual paging receiver or the like, Japanese Patent Application No.
Japanese Patent Application Laid-Open No. 179806, Japanese Utility Model Application No. 1-1151128 and the like are known. Japanese Patent Application No. 6-179
No. 806 discloses a method of temporarily holding a loop antenna in a holder for holding the loop antenna using a resin material, temporarily attaching the loop antenna to a printed circuit board, and positioning and holding the loop antenna. The technique disclosed in Japanese Utility Model Application Laid-Open No. 1-151128 has a structure in which a loop antenna is directly mounted without a holder, and a circuit board near the loop antenna is provided with antenna protection and protection. A case reinforcing member is attached to prevent unnecessary deformation of the loop antenna.

[0003]

However, when a resin material holder described in Japanese Patent Application No. 6-179806 is used as the above example, there is a problem that the antenna gain is deteriorated due to the dielectric constant of the holder. There is a problem in that the use of the holder increases the number of parts by one, thereby increasing the cost of the product itself.

As the second example, Japanese Utility Model Application Laid-Open No. Hei.
In the case where the loop antenna is directly fixed to a printed circuit board as described in Japanese Patent Publication No. 1128 and the antenna protection and case reinforcing member is simply attached to the circuit board, deformation or the like may still occur due to an impact or the like. In addition, there is a problem that electric influence may be caused, and the number of parts increases and the cost of the product itself increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. Even if a holder is not used and it is directly mounted on a printed circuit board, deformation due to impact can be suppressed, and antenna gain can be reduced in a high frequency band. It is an object of the present invention to provide an individual paging receiver and a loop antenna holding structure and method for the same, which can obtain a structure capable of improving the performance.

[0006]

According to the present invention, in order to solve the above-mentioned problems, the holder is eliminated and the structure of the loop antenna is joined to a printed circuit board and soldered instead of a conventional simple loop. An antenna junction is formed by adding the antenna vertically and slightly near the center in the longitudinal direction of the loop antenna.

According to the present invention, by adding an antenna joining portion for joining a loop antenna to a board and soldering the same, it is possible to suppress deformation due to impact even when directly attached to a printed board. Machine and its loop antenna holding structure and method are obtained.

According to the present invention, in order to solve the above-mentioned problem, an inductance element is connected in parallel with a loop antenna via an antenna junction. The present invention provides a method and structure for holding a loop antenna of an individual paging receiver capable of improving the antenna gain in a high frequency band, for example, a 900 MHz band.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is as follows.
A loop antenna formed in a loop shape and having an antenna joining portion joined to a printed circuit board near the center of the loop shape, a positioning portion for positioning the loop antenna, and the looped antenna provided near the positioning portion and electrically connected to the loop antenna; A printed circuit board provided with one or more soldered lands to be connected is provided. Even when the antenna is directly mounted on a printed circuit board, deformation of the antenna due to impact can be prevented and the number of components can be reduced. It has the action of:

According to a second aspect of the present invention, there is provided a loop antenna having an antenna connecting portion formed in a loop shape and connected to a printed circuit board near the center of the loop shape, and a positioning portion for positioning the loop antenna. A printed circuit board provided with at least one soldered land portion provided near the positioning portion and electrically connected to the joined loop antenna; and an inductance element connected in parallel to the loop antenna. Even when the antenna is directly mounted on a printed circuit board, the antenna can be prevented from being deformed due to impact, the number of components can be reduced, and the antenna gain can be improved in a high frequency band.

According to a third aspect of the present invention, the loop antenna constitutes an antenna substrate fitting portion to be joined to a positioning portion of the printed circuit board. By firmly incorporating the part and the positioning part of the printed circuit board,
Even if the loop antenna is deformed, the loop antenna is corrected so that a stable opening area can be maintained, and the electric characteristics can be stabilized.

According to a fourth aspect of the present invention, the loop antenna holding structure according to the first, second or third aspect is incorporated. Even when the loop antenna is directly mounted on a printed circuit board, it is not affected by an impact. In addition to preventing deformation of the antenna and reducing the number of parts, the gain of the antenna can be improved in a high frequency band, and even a loop antenna that has been deformed can be corrected and a stable opening area can be maintained. Can be stabilized.

According to a fifth aspect of the present invention, an antenna connecting portion is provided near a center of a loop antenna formed in a loop shape and connected to a substrate, and the loop antenna provided on the substrate is positioned. Bonding the antenna bonding portion of the loop antenna to the positioning portion, and joining the antenna bonding portion to the positioning portion of the substrate, thereby connecting the loop antenna to the soldered land portion provided on the substrate. It is designed to be electrically connected to
This has the effect of preventing deformation of the antenna due to impact and reducing the number of parts.

Hereinafter, based on the attached drawings and FIGS. 1 to 5,
Embodiments 1 and 2 of the present invention will be described in detail. (Embodiment 1) First, with reference to FIG. 1 and FIG. 2, an individual paging receiver and its loop antenna holding structure and method according to Embodiment 1 of the present invention will be described. FIG.
2 is an exploded perspective view of the loop antenna holding structure according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a state where the loop antenna shown in FIG. 1 is attached to a substrate.

In FIGS. 1 and 2, 1 is a loop antenna, 2 is a printed board, 12 is an antenna joining portion, 13 is an antenna board fitting portion, 21 is a positioning groove as a positioning portion, and 22 is a land portion with solder. is there. Hereinafter, the configuration and forming means of the loop antenna holding structure according to the first embodiment of the present invention will be described in more detail. First, a loop antenna 1 in which a metal plate is formed in a loop shape and processed into an E-shape so as to be brought into contact with a substrate in the vicinity of the upper and lower central portions in the longitudinal direction and soldered to provide an antenna joint portion 12, The printed circuit board 2 is provided with a positioning groove 21 for holding and a soldering portion 22.

The loop antenna 1 according to the first embodiment of the present invention is used for an individual paging receiver or the like, and has a thickness of 0.1 mm.
The width is about 5 mm to 1 mm, and the width is about 3 mm. When it is processed into a loop, it has an opening area of about 50 × 10 mm. An antenna joint 12 is added near the longitudinal center of the loop antenna 1 processed in a loop shape to be in contact with a printed circuit board and soldered. Further, an antenna board fitting portion 13 is formed to facilitate positioning of the loop antenna 1 with the printed board 2. The printed board 2 is provided with a positioning groove 21 for positioning the loop antenna 1 and a land 22 with solder for fixing the loop antenna 1 by soldering. Note that the opening area of the loop antenna 1 is not limited to the above, and can be changed as necessary, such as the resonance frequency to be used, and the material of the loop antenna 1 can be any conventionally used metal such as copper. It may be made of a material.

FIG. 2 shows a state where the loop antenna 1 is assembled with the positioning groove 21 of the printed circuit board 2.
With such a configuration, the antenna bonding portion 12 that is brought into contact with and soldered to the substrate provided in the vicinity of the center of the loop antenna 1 in the longitudinal direction and in the longitudinal direction has a pillar-like shape in the center portion of the loop antenna that is most easily deformed. By playing a role, deformation due to impact can be suppressed.

Further, the loop antenna 1 is formed by fitting the antenna board fitting portion 13 into the groove 21 of the printed board.
If the loop antenna 1 is deformed in the longitudinal direction before being incorporated into the printed circuit board 2, it is corrected at the same time as being incorporated into the printed circuit board 2, a stable opening area can be obtained, and electrical characteristics can be stabilized.

(Embodiment 2) Next, with reference to FIG. 3, FIG. 4, and FIG. 5, an individual paging receiver and a loop antenna holding structure and method thereof according to Embodiment 2 of the present invention will be described. FIG. 3 is a perspective view of a loop antenna holding structure in which the loop antenna according to the second embodiment of the present invention is mounted on a printed circuit board and an inductance element is connected in parallel with the loop antenna. FIG. 4 is a loop in which the inductance element shown in FIG. FIG. 3 is a circuit diagram of the antenna,
5A is a circuit wiring diagram of the loop antenna, FIG. 5B is a circuit configuration diagram of the loop antenna, and FIG. 5 is a directional pattern diagram showing the directional characteristics of the loop antenna to which the inductance element shown in FIG. 3 is connected. () Is a directional pattern showing the directivity of vertical polarization, and (B) is a directional pattern showing the directivity of horizontal polarization.

Next, the circuit configuration of the loop antenna according to the second embodiment will be described with reference to FIGS. In FIG. 4B, 1 is a loop antenna, 3 is an inductance element connected in parallel to the loop antenna 1, and 4 is a tuning circuit and a splitting element for impedance matching. Loop antenna 1 has inductance L1
(For example, 40 nH). When a tuning capacitor is loaded in a high-frequency band, for example, a 900 MHz band, the loop antenna 1 reduces the capacitance of the capacitor or decreases the inductance of the antenna element (reduces the antenna opening area). Although the execution gain condition can be satisfied, there is a limit in reducing the capacitance value of the capacitor, and it is physically impossible (it does not exist because it is too small). In addition, since there is a limit in reducing the antenna aperture area, it is difficult to satisfy the antenna effective gain condition.

Therefore, by connecting the inductance element 3 to the loop antenna 1 in parallel, the inductance L2 of the loop antenna 1 is reduced (for example, 10n).
H) That is, the capacitance value can easily satisfy the antenna effective gain condition without reducing the capacitor capacitance value or the antenna opening area. The inductance element 3 is mounted on the printed circuit board 2 as shown in FIG. 3, and one end of a lead wire of the inductance element 3 is connected to an antenna joint 12 extending from below the center of the loop antenna 1, The other end of the lead wire is connected to an antenna joint 12 extending from above the center of the loop antenna 1.

Next, with reference to FIG. 5, the antenna directional characteristics of the loop antenna to which the inductance element according to the second embodiment of the present invention is connected will be described. As can be seen from the directional characteristics shown in FIGS. 5A and 5B, the loop gain of the conventional configuration has an antenna gain of −15 dBd.
On the other hand, according to the configuration of the loop antenna to which the inductance element is connected in the second embodiment, the antenna gain becomes -12 dBd, and the gain increases by 3 dBd.

That is, by connecting the inductance element 3 through the antenna junction 12, the capacity of the capacitor can be increased in a high frequency band, for example, in a 900 MHz band, so that the matching with the impedance of the individual paging receiver can be achieved. Therefore, even when the reception frequency becomes high, the effective gain of the antenna can be easily obtained, and the electrical characteristics can be improved.

[0024]

The present invention is constructed as described above. In particular, the structure of the loop antenna is changed from a mere loop-like shape like a conventional loop antenna to a portion which comes into contact with the substrate in the upper and lower portions in the longitudinal direction and near the center. By adding the above, it is possible to obtain an individual paging receiver and its loop antenna holding structure and method capable of suppressing deformation due to impact even when directly attached to a printed circuit board.

According to the present invention, the antenna gain can be improved in a high frequency band, for example, in a 900 MHz band by connecting an inductance element through an antenna junction in parallel with the loop antenna, in particular, as described above. The method and structure for holding the loop antenna of the individual paging receiver are obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a loop antenna holding structure according to a first embodiment of the present invention;

FIG. 2 is a perspective view showing a state in which the loop antenna shown in FIG. 1 is attached to a substrate.

FIG. 3 is a perspective view of a loop antenna holding structure in which the loop antenna according to the second embodiment of the present invention is mounted on a printed circuit board and an inductance element is connected in parallel with the loop antenna;

4A is a circuit diagram of a loop antenna to which the inductance element shown in FIG. 3 is connected, wherein FIG. 4A is a circuit wiring diagram of the loop antenna, FIG. 4B is a circuit configuration diagram of the loop antenna,

FIG. 5 is a directional characteristic diagram showing a directional characteristic of a loop antenna to which the inductance element shown in FIG. 3 is connected,
(A) is a directional pattern showing the directional characteristics of vertically polarized waves, (B)
9 is a directional pattern diagram showing the directional characteristics of horizontal polarization.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loop antenna 2 Printed circuit board 3 Inductance element 4 Tuning circuit and division element for impedance matching 12 Antenna joint part 13 Antenna board fitting part 21 Positioning groove 22 Land part with solder

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J047 AA03 AA08 AA10 AB11 FC01 FD01 5K016 AA07 AA15 BA06 CA03 CB02 CB15 GA02 GA09 HA05 5K067 AA33 BB22 EE02 KK01 KK17

Claims (5)

[Claims] A loop antenna formed in a loop shape and having an antenna bonding portion to be connected to a printed circuit board near a center of the loop shape; a positioning portion for positioning the loop antenna; and the bonding portion provided near the positioning portion. A printed circuit board provided with one or more soldered lands electrically connected to the loop antenna. 2. A loop antenna which is formed in a loop shape and has an antenna joining portion which is joined to a printed board near a center of the loop shape, a positioning portion for positioning the loop antenna, and the joining portion provided near the positioning portion. A loop antenna holding structure, comprising: a printed circuit board provided with one or more soldered lands electrically connected to the loop antenna; and an inductance element connected in parallel to the loop antenna. 3. The loop antenna holding structure according to claim 1, wherein said loop antenna forms an antenna board fitting portion to be joined to a positioning portion of said printed board. 4. An individual paging receiver incorporating the loop antenna holding structure according to claim 1, 2 or 3. 5. An antenna bonding portion for bonding to a substrate is provided near the center of the loop antenna formed in a loop shape, and the antenna bonding of the loop antenna to a positioning portion provided on the substrate for positioning the loop antenna. Joining the loop antenna to the positioning portion of the substrate, by joining the antenna joining portion, the loop antenna is electrically connected to the solder land provided on the substrate. A method for holding a loop antenna.