JP3045206U - Auxiliary antenna for mobile phones - Google Patents

Abstract

(57) [Abstract] [Problem] The present invention improves the transmission gain of a mobile phone by merely attaching a loop antenna made of a metal foil in the form of a seal to the back of the mobile phone. [Solution] In the present invention, a loop antenna 3 made of a metal foil seal is attached to a position near the antenna 2 attached to the mobile phone 1 on the back of the mobile phone 1. When using the mobile phone 1, the mobile phone 1 is generally used by holding it with the hand 4 as shown in FIG. It is formed by the stray capacitance CO generated between the loop antenna 3 and the human body. Since the resonance circuit is electromagnetically coupled with the circuit of the antenna 2 of the mobile phone 1, the transmission and reception gains of the mobile phone 1 are improved, which helps to reduce the dead zone.

Description

[Detailed description of the invention]

[Technical field to which the present invention pertains] The present invention solves an area where a mobile phone, particularly a PHS, has lower transmission output and reception sensitivity than other mobile mobile phones, and cannot communicate in a building or underground. Is what you do.

2. Description of the Related Art In many cases, a mobile phone, especially a PHS, is not completely covered by a relay base station and has a weak transmission output, resulting in a dead zone with respect to other mobile phones.

[Problems to be Solved by the Invention] In mobile phones, particularly in PHS, the transmission output and the reception sensitivity are improved without directly processing the device body and without impairing the function. And reduce the area where calls cannot be made.

[Means for Solving the Problems] In order to solve the problems, in the present invention, the surface is insulated at a position as close as possible to the antenna 2 on the side of the mobile phone 1 on the back of the mobile phone 1. Attach the sealed loop antenna.

[Embodiment of the Invention] When using the mobile phone 1, a method of holding the mobile phone 1 with the hand 4 and making a call is general. Therefore, since the loop antenna 3 and the hand 4 attached to the back of the mobile phone 1 are wrapped in the hand 4, the stray capacitance CO is formed between the loop antenna 3 and the hand 4 of the metal seal foil through the human body and the ground. Occurs. This stray capacitance CO and loop antenna 3 are matched to the communication frequency of the mobile phone to form a resonance circuit, which increases the gain of the antenna input and output of the mobile phone.

Embodiment [FIG. 1] shows a general mobile phone 1, and an antenna 2 is attached to a side surface of a rectangular case behind a case.

In this case, the antenna 2 functions as a whip antenna.

In FIG. 2, a loop antenna 3 of a seal-shaped metal foil whose surface is insulated is attached to a position near the upper rear surface of the mobile phone 1 and the antenna 2.

FIG. 3 shows a state in which the mobile phone 1 is generally used. That is, the loop antenna 3 made of a seal-shaped metal foil attached to the back of the mobile phone 1 is wrapped in the hand 4.

As a result, the loop antenna 3 forms a kind of resonance circuit with the hand 4 and the stray capacitance CO coupled through the human body. The equivalent circuit of this configuration is shown in FIG.

[Effects of the Invention] As described above, according to the present invention, an area where calls cannot be made due to a decrease in sensitivity due to a base station not being completely covered, such as a PHS mobile phone or a mobile phone, is reduced to reduce the utility value. improves . In addition, the effect can be improved only by sticking a simple loop antenna of a sticky metal foil seal, and it can be realized without impairing the function of the device at all.

[Brief description of the drawings]

FIG. 1 is a front external view of a mobile phone.

FIG. 2 is a rear view of a mobile phone.

FIG. 3 is an external view of a mobile phone operated.

FIG. 4 is a diagram illustrating an equivalent circuit.

[Explanation of symbols]

 1 mobile phone 2 antenna 3 loop antenna 4 hands CO stray capacitance

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[Procedure amendment]

[Submission date] October 11, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

1. An auxiliary antenna for a mobile phone which increases transmission output and reception sensitivity by attaching an auxiliary antenna to the mobile phone.

[Procedure amendment]

[Submission date] July 2, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04M 1/02 H04M 1/21 L 1/21 H04B 7/26 V

Claims (1)

[Utility model registration claims] 1. A system for increasing transmission output and reception sensitivity by attaching an auxiliary antenna to a mobile phone.