JP3034032U - Loop antenna and communication terminal incoming notification device using the same - Google Patents

Abstract

(57) [Abstract] A loop antenna having a large opening area of a loop to improve the gain and separating the loop from a component on a board to prevent deterioration of the gain and variation in characteristics during mass production. provide. An opening surface of a loop 27 is configured to be parallel to a surface of a ground substrate 41, and an opening area of the loop 27 is substantially equal to or larger than an area of the ground substrate 41.
As compared with the case where the loop is arranged vertically to the ground substrate as in the conventional case, the opening area of the loop is large and the gain is improved. In addition, the distance between the loop 27 and the ground substrate 41 is set to 4
Since it is set to 1/0 or more, the loop does not traverse the grounded substrate as in the conventional case, and the loop can be separated from the components on the substrate, so that it is possible to prevent deterioration of gain and variation in characteristics during mass production.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a loop antenna, and to a communication terminal incoming call notification device capable of notifying a person of an incoming call to a communication mobile terminal such as a cellular (cell phone) or PHS (simple cell phone). It concerns a loop antenna as used.

[0002]

[Prior art]

 Conventionally, a loop antenna as described in JP-B-53-30977 has been used in a small portable receiver such as a beja. A conventional example of this loop antenna is shown in FIG.

As shown in FIG. 7, since the surface of the ground substrate 34 and the opening surface of the loop antenna 32 are orthogonal to each other, as shown in FIG. 7, when the human body is worn (for example, in a pocket), the loop antenna The opening surface of 32 has a relationship of being arranged perpendicular to the tangent line of the surface 38 of the human body. A tuning capacitor 35 is interposed between the ground antenna 34 and one end 32a of the loop antenna 32. The other end portion 32b of the loop antenna 32 is short-circuited to the ground substrate 34, and the loop antenna 32 is fed from the tap feeding portion 37.

Since the loop antenna 32 as described above has the surface 38 of the human body and the loop surface arranged vertically by taking advantage of the advantage of the magnetic field type antenna, it is less likely to be affected by the human body. Furthermore, considering the ground substrate 34 as a reference, the tap feeding portion 37 also has an element of a monopole antenna in which the loop antenna 32 is top-loaded, and operates as an electric field type antenna. Due to the configuration of the loop antenna 32, the polarization planes of the magnetic field type and the electric field type are orthogonal to each other, so that both vertical and horizontal polarized waves can be supported.

[0005]

However, the conventional loop antenna 32 shown in FIG. 6 needs to rotate the loop perpendicularly to the ground substrate 34, so that when the loop antenna 32 is used in a small portable receiver, the loop antenna is There is a drawback in that the aperture area cannot be made large and the gain deteriorates.

Further, since the loop is configured to traverse the ground substrate 34, it is easily affected when components on the ground substrate 34 come close to each other, resulting in deterioration of gain and variation in characteristics during mass production (assembly). (Due to variations in the positional relationship between each part and the loop).

In view of this, the present invention provides a loop in which the loop opening area is increased to improve the gain, and the loop is separated from the components on the board to prevent the gain from deteriorating and the variations in characteristics during mass production. It is an object to provide an antenna.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is configured such that the opening surface of the loop is parallel to the surface of the grounding board, the opening area of the loop is substantially equal to or larger than the grounding board area, and the loop and the grounding board are The distance is set to 1/40 or more of the wavelength.

According to the loop antenna having such a configuration, the opening surface of the loop is configured to be parallel to the surface of the grounding board, and the opening area of the loop is almost equal to or larger than the grounding board area. As compared with the case where the loop is arranged perpendicularly to the ground substrate as described above, the opening area of the loop is large and the gain is improved.

Further, since the distance between the loop and the ground substrate is set to 1/40 or more of the wavelength, the loop does not traverse the ground substrate unlike the conventional case, and the loop can be separated from the components on the substrate. It is possible to prevent deterioration and variations in characteristics during mass production.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 are views showing a communication terminal incoming call notification device using a loop antenna according to a first embodiment of the present invention.

A mobile phone (communication mobile terminal) 10 shown in FIG. 1 has an antenna 12 that performs radio communication with a base station 15 (see FIG. 3) by radio waves, and the antenna 12 is connected to the antenna 12. A main circuit 14 for demodulating a signal transmitted from a base station 15 via 12, and a control for connecting the main circuit 14 and controlling each component of the mobile phone 10 to operate the mobile phone 10 with a communication function. And part 16.

The operation up to this point is similar to that of an ordinary mobile phone, but the mobile phone 10 of the present embodiment further has a remote control function for driving the small vibrator 25 as an incoming call notification device by radio waves. doing. That is, a vibrator communication circuit 18 is connected to the control unit 16, and the vibrator communication circuit 18 is controlled by the control unit 16 so that the high frequency amplified ID signal is transmitted from the remote control antenna 20 to the small vibrator 25. Send by.

The small vibrator 25 receives the ID radio wave from the remote control antenna 20 of the mobile phone 10 by the remote control antenna 27, amplifies the transmitted signal at a high frequency by the high frequency amplification circuit 29, and has a high sensitivity data detection circuit. The data is detected by 31 and the signal for ID is determined, and the data detection circuit 31 starts the rotation of the motor 33 that is the drive source for the vibration operation of the small vibrator 25.

As the remote control antenna 27 of the small vibrator 25, a loop antenna having a shape as shown in FIG. 2 is used. In the figure, the surface of the ground substrate 41 and the opening surface of the loop antenna 27 are parallel to each other, and the outer shape of the loop antenna 27 is substantially the same as the outer shape of the ground substrate 41 (and thus the outer shape of the ground portion 44). It has

When attached to a human body (for example, in a pocket), the opening surface of the loop antenna 27 is parallel to the tangent to the surface of the human body. Further, a tuning capacitance capacitor 45 is interposed between the ground antenna 44 and one end 43 of the loop antenna 27. The other end 46 of the loop antenna 27 is short-circuited to the grounding portion 44, and the loop antenna 27 is fed from the tap feeding portion 47.

As shown in FIG. 3, when the mobile phone 10 and the small vibrator 25 configured as described above determine that the mobile phone 10 receives an electric wave from the base station 15, the mobile phone 10 is small. A signal for ID is transmitted to the vibrator 25 by a weak radio wave to notify the mobile phone 10 of an incoming call.

Then, the small vibrator 25 can judge the fact and rotate the motor 33 to vibrate the whole small vibrator 25 to notify the user 17 that the mobile phone 10 has received an incoming call. Therefore, even if the mobile phone 10 is placed or placed in a place away from the bag or other body, it is possible to notify the user 17 of the incoming call to the mobile phone 10 without fail.

Further, by configuring the remote control antenna 27 as described above, the opening area of the loop antenna 27 can be made larger than in the conventional case, and the gain is greatly improved. In addition, considering that the components are mounted on the back and front surfaces of the ground substrate 41, the high-height component 48 is arranged in the central portion 44a of the loop antenna 27 on the ground portion 44 of the substrate surface 41a. Then, the gain does not deteriorate due to the proximity of the loop antenna 27 and the component 48, and the characteristics do not vary during mass production.

Further, by arranging a component having a low height on the back surface 41b of the ground board 41, the distance L between the ground board 41 and the wire 27a of the loop antenna 27 is increased, and the gain is further improved. . Experiments have shown that a high gain can be obtained if the distance L is 2.5 mm or more when the distance is 1/40 or more of the wavelength, for example, when the frequency of the radio wave to be transmitted is 300 MHz. There is.

As for sensitivity to both horizontal and vertical polarized waves, at 300 MHz, the dimensions of the grounding board 41 of the small vibrator 25 are 20 mm long and 50 mm wide, the vertical and horizontal dimensions of the loop are 20 mm × 50 mm, and the loop height is 4 mm. When it is configured with 0.5 mm, the gain characteristic values shown in (1), (2), and (3) below are obtained, and it can be seen that there is sensitivity to both horizontal and vertical polarized waves.

Horizontally polarized wave Vertically polarized wave Direction A (upward) -15.3 dBd -15.0 dBd (1) Direction B (independent vertical) -14.8 dBd -12.7 dBd (2) Direction C (independent) Horizontal) -16.7 dBd -15.3 dBd (3)

In the measurement direction A, the loop antenna 27 is rotated in the XY plane in FIG. 4, in the measurement direction B, the loop antenna 27 is rotated in the YZ plane, and in the measurement direction C. Shall rotate the loop antenna 27 in the ZX plane.

Both horizontal and vertical polarization planes are as shown in FIG. 5, FIG. 5 (a) shows vertical polarization, and FIG. 5 (b) shows horizontal polarization. Further, the gain characteristic value shows a peak value and is represented by a dipole ratio (dBd).

Then, the loop antenna 27 is impedance-matched with the power feeding line by the power feeding by the tap power feeding unit 47. The tuning capacitor capacity 45 is 0.5 pF and is operated at about 300 MHz. Further, since the loop antenna 27 is a magnetic field type antenna, it is unlikely to be affected by the human body as in the conventional example.

In the above embodiment, a mobile phone (cellular) has been described as an example, but the present invention can be applied to other communication mobile terminals such as PHS.

Further, in the above-described embodiment, the case where the small vibrator 25 that notifies an incoming call to the incoming call notification by vibration is used, but an incoming call notification device that notifies the incoming call by voice like an alarm is used. Good.

[0028]

[Effect of the invention]

 As described above, according to the present invention, the opening surface of the loop is configured to be parallel to the surface of the grounding board, and the opening area of the loop is almost equal to or larger than the grounding board area. As compared with the case where the loop is arranged perpendicularly to the ground substrate, the opening area of the loop is large and the gain is improved.

Further, since the distance between the loop and the ground substrate is set to 1/40 or more of the wavelength, the loop does not traverse the ground substrate unlike the conventional case, and the loop can be separated from the components on the substrate. It is possible to prevent deterioration and variations in characteristics during mass production.

[Brief description of the drawings]

FIG. 1 is a mobile phone 10 according to a first embodiment of a communication terminal incoming notification device using a loop antenna according to the present invention.
3 is a block diagram showing a small vibrator 25 and FIG.

FIG. 2 is a detailed perspective view of the loop antenna 27 of FIG.

FIG. 3 is a conceptual diagram showing operations of the mobile phone 10 and the small vibrator 25.

FIG. 4 is a diagram illustrating a measurement direction of sensitivity of the loop antenna 27 with respect to both horizontal and vertical polarized waves.

FIG. 5 is a diagram showing both vertical and horizontal polarization planes related to the sensitivity measurement of the loop antenna 27.

FIG. 6 is a perspective view showing a conventional loop antenna 32.

FIG. 7 is a schematic diagram showing a conventional loop antenna 32 mounted on a surface 38 of a human body.

[Explanation of symbols]

 10 Mobile Phone 12 Antenna 14 Main Circuit 15 Base Station 16 Control Unit 17 User 18 Vibrator Communication Circuit 20 Remote Control Antenna 25 Small Vibrator 27 Remote Control Antenna (Loop Antenna) 27a Wire 29 High Frequency Amplification Circuit 31 Data Detection Circuit 32 Loop Antenna 32a End 32b End portion 33 Motor 34 Grounding substrate 35 Tuning capacitance capacitor 43, 46 End portion 37 Tap feeding portion 38 Human body surface 41 Grounding substrate 41a Substrate surface 41b Substrate back surface 44 Grounding portion 44a Central portion 45 Tuning capacitance capacitor 47 Tap feeding portion 48 Parts L distance

Claims (2)

[Utility model registration claims] 1. An opening surface of the loop is formed parallel to the surface of the ground substrate, an opening area of the loop is substantially equal to or larger than the ground substrate area, and a distance between the loop and the ground substrate is 40 wavelengths. A loop antenna characterized by being set to one-half or more. 2. When an incoming call arrives at the communication portable terminal, the communication portable terminal transmits an ID signal by radio waves to a data receiving section of the incoming call notification device, and the incoming call notification device sends a signal for the ID. In an incoming call notification device for a mobile communication terminal that performs an incoming call notification operation after detection, the opening surface of the loop is configured to be parallel to the surface of the grounding board, and the opening area of the loop is almost equal to or larger than the grounding board area. A communication terminal incoming call notification device characterized by using a loop antenna in which the distance between the loop and the grounding board is set to 1/40 or more of the wavelength.