JP2001251232A - Antenna diversity receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna diversity receiver whose reception performance can be improved, even under an environment where a reception status is tight. SOLUTION: In this receiver, an earpiece section 200 incorporating an earphone and a chip antenna AN2 and a cord 300 are placed in a mobile phone body 100 having a diversity reception function. When the cord 300 is not connected to the mobile phone body 100, using a main antenna AN0 and a sub antenna AN1 of the mobile phone body 100 can conduct diversity reception. When the cord 300 is connected to the mobile phone body 100, employing the antenna AN0 and the chip antenna AN2 of the earphone section 200 placed apart by a sufficient distance can conduct diversity reception.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna diversity receiving apparatus, and more particularly, to a configuration for improving reception performance in a portable telephone.

[0002]

2. Description of the Related Art In a portable telephone, in order to prevent deterioration of transmission quality due to deterioration of reception conditions such as fading, antenna diversity reception in which signals are received using two antennas is mainly used.

[0003]

By the way, in such antenna diversity reception, two systems of antennas are set to λ.
A sufficient diversity effect can be obtained by arranging at least / 3 to λ / 2 (λ: wavelength of a signal to be transmitted and received) or more.

For example, 800 MHz (wavelength λ: about 37
cm) is about 13 to 18 cm (= λ / 2) for a PDC type mobile phone that transmits and receives a signal, and about 7 to 10 cm for a mobile phone that transmits and receives a 1.5 GHz signal.
It is.

However, in recent years, miniaturization of portable telephones has been progressing. Therefore, in the conventional configuration in which two antennas are mounted on the body of the mobile phone, a sufficient distance between the two antennas cannot be ensured due to miniaturization. For this reason, in an environment where deterioration of the reception situation such as fading cannot be ignored, there is a problem that the reception performance is reduced and the transmission quality is not guaranteed.

Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide an antenna diversity receiving apparatus capable of improving the receiving performance of a portable telephone.

[0007]

SUMMARY OF THE INVENTION An antenna diversity receiving apparatus according to the present invention is transmitted from a portable telephone main body including a first antenna and a second antenna for receiving a radio signal including an audio signal, and transmitted from a portable telephone main body. An earphone for outputting a sound based on the sound signal, an earpiece portion including a third antenna for receiving a radio signal including the sound signal, and a cord having one end connected to the earpiece portion. The mobile phone body includes: a connection portion for connecting the other end of the cord; and, when the cord is connected to the connection portion, diversity reception of a radio signal by the first antenna and the third antenna. When the cord is not connected to the connection unit, the signal processing unit for diversity reception of the radio signal by the first antenna and the second antenna is further added. Including.

[0008] Preferably, the third antenna is a chip dielectric antenna formed of a high dielectric constant material. And
In particular, the code ensures that the distance between the first antenna and the third antenna is at least λ / 3 to λ / 2 with respect to the wavelength λ of the received radio signal.

[0009] More specifically, the portable telephone main body is provided with a second antenna or a third antenna depending on the connection state at the connection section.
A first switching unit for electrically connecting the antenna and the signal processing unit, an audio output circuit for outputting audio based on the output of the signal processing unit, and an audio output circuit or A second switching unit for transmitting an audio signal to the code.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

A configuration of an antenna diversity receiving apparatus according to an embodiment of the present invention will be described with reference to FIG. 1 and FIG. 1 and 2, a mobile phone body 100 having a diversity function having a main antenna and a first sub-antenna, and an earpiece portion 2 having a chip antenna dedicated to reception functioning as a second sub-antenna
00 and a cord 300 for connecting the mobile phone main body 100 and the earpiece unit 200 are shown.

The portable telephone body 100 includes a main antenna AN0 for transmitting and receiving radio signals including audio signals, a sub-antenna AN1 for receiving radio signals including audio signals,
A receiving unit 1 for receiving and processing an RF signal received by a main antenna AN0, a receiving unit 2 for receiving and processing an RF signal received by a sub-antenna AN1 or a chip antenna AN2 described later, and a main antenna AN0 for transmitting a radio signal including a voice signal. And a duplexer 4 for switching the main antenna AN0 for transmission or reception, and a diversity reception processor 5 for receiving the output of the receiver 1 and the output of the receiver 2. .

In the diversity reception processing unit 5, the reception unit 1
And the output of the receiving unit 2 are demodulated, and a signal transmitted by using one of the two sets of demodulated data is reproduced, or a signal transmitted by combining two sets of demodulated data. Is determined.

The main antenna AN0 is connected to the portable telephone body 10
Pull out from 0 and arrange so that it can be stored in the main body.
The sub-antenna AN1 is built in the mobile phone main body 100. When the main antenna is pulled out, the signal wavelength λ
A length of λ / 4 is secured. The main antenna A
N0 and the sub-antenna AN1 are not particularly limited to those described above.

The portable telephone body 100 further includes an earpiece jack 6 having an input / output function, an audio section 8 for performing audio reproduction processing for reproducing audio based on the processing in the diversity reception processing section 5, and an output of the audio section 8. A speaker 9 for receiving and outputting sound to the outside, and a switching unit 10 for switching a connection relationship from the sub-antenna AN1 to the earpiece unit 200 in accordance with a coupling state between the earpiece jack 6 and the cord 300 are provided.

The switching unit 10 includes a switching unit 11 for electrically connecting one of the sub-antenna AN1 and the chip antenna AN2 to the receiving unit 2 in accordance with a coupling state between the earpiece jack 6 and the cord 300; Depending on the connection between the earpiece jack 6 and the cord 300, the audio unit 8
And a switching unit 12 for transmitting the output of the above to either the speaker 9 or the cord 300.

A plug 30 for connecting to the earpiece jack 6 is provided at one end of the cord 300, and an earpiece 200 is connected to the other end. Earpiece section 200 is electrically connected to mobile phone main body 100 via cord 300.

The earpiece 200 is provided with a chip antenna A
N2 and a matching circuit 2 arranged between the chip antenna AN2 and the code 300 for outputting a radio signal including an audio signal received by the chip antenna AN2 to the code 300.
0 and an audio unit 21 (earphone) for outputting the audio signal received by the code 300 to the outside as audio.
The user can hear the sound by approaching or wearing the earpiece unit 200 to the ear.

The chip antenna AN2 is a small-sized dielectric antenna formed of a material having a high dielectric constant. In FIG.
An example of a chip antenna is shown. The shape and dimensions of the chip antenna shown in FIG. 3 are 9 mm long × 2 mm wide ×
It has a height of 2 mm, and includes two grounds 50A and 50B for grounding the chip antenna, and a power supply electrode section 52 to which a power supply line is connected. The material is based on barium titanate (BaTiO ₃ ) and has a dielectric constant of 21.4.
Is.

A small and thin chip antenna AN2 is used. The material is based on a high dielectric constant material such as barium titanate. The characteristics such as the dielectric constant are improved by adding other materials based on barium titanate.

The code 300 ensures that the distance between the main antenna AN0 and the chip antenna AN2 is at least λ / 3 to λ / 2 with respect to the wavelength λ of the received radio signal.

Next, communication processing based on the above configuration will be described. The mobile phone main body 100 has a communication function independently. When the cord 300 is not coupled to the earpiece jack 6, the signal received by the sub antenna AN 1 and the signal received by the main antenna AN 0 are provided to the diversity reception processing unit 5. Mobile phone body 100
Is a main antenna AN provided on the mobile phone body 100.
0 and the sub-antenna AN1 realize diversity reception. In this state, the user hears voice through the speaker 9.

On the other hand, the cord 30 is
0, the switching unit 11 causes the sub-antenna AN
1 and the chip antenna AN2 and the receiving section 2 are electrically connected. Therefore, when receiving a signal in this state, the signal received by chip antenna AN2 and the signal received by main antenna AN0 are given to diversity reception processing section 5. That is, mobile phone main body 100 realizes diversity reception by main antenna AN0 provided in mobile phone main body 100 and chip antenna AN2 built in earpiece section 200.

Main antenna AN0 and chip antenna AN2
Is secured at least λ / 3 to λ / 2 with respect to the wavelength λ of the received radio signal, so that the correlation between the antennas is reduced. Therefore, a sufficient diversity effect can be obtained.

In this state, the switching unit 12
Electrically connects the earpiece unit 200 and the audio unit 8 instead of the speaker 9. Therefore, the user can hear the sound with the earpiece unit 200 (earphone) instead of the speaker 9.

As described above, according to the antenna diversity receiving apparatus according to the embodiment of the present invention, by connecting the earpiece portion to the portable telephone body via the cord,
Antenna diversity reception can be realized by the main antenna provided in the mobile phone main body and the chip antenna built in the earpiece portion located at a position sufficiently away from the mobile phone main body.

Therefore, in an environment where reception conditions are severe such as fading, the diversity effect can be improved by connecting the earpiece unit 200 and the portable telephone body 100.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description of the embodiments, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0029]

According to the antenna diversity receiving apparatus of the present invention, the main antenna provided on the mobile phone main body is connected by connecting the mobile phone main body having a communication function and the earpiece section including the chip antenna via the cord. And an antenna built in the earpiece portion can perform antenna diversity reception.

Thus, a sufficient distance can be provided between the main antenna arranged in the portable telephone body and the chip antenna built in the earpiece portion. Therefore, regardless of the miniaturization of the mobile phone main body, a telephone call can be performed in a state where the mobile phone main body and the earpiece portion are separated from each other by λ / 3 to λ / 2 or more with respect to the signal wavelength λ, thereby improving the diversity effect. Can be.

Further, since a small chip antenna serving as a sub-antenna is built in the earpiece portion originally used for listening to voice, the reception performance can be improved without particularly increasing the scale of the device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration for realizing an antenna diversity receiving apparatus according to an embodiment of the present invention.

FIG. 2 shows a mobile phone body 100 and an earpiece unit 20.
FIG. 3 is a conceptual diagram showing a relationship between 0 and a code 300.

FIG. 3 is a diagram illustrating an example of a chip antenna AN2.

[Explanation of symbols]

1, 2 receiver, 3 transmitter, 4 duplexer, 5
Diversity reception processing unit, 10, 11, 12 switching unit,
6 Earpiece jack, 8,21 audio part, 9 speaker, 20 matching circuit, 30 plug, AN0 main antenna, AN1 auxiliary antenna, AN2 chip antenna, 1
00 mobile phone body, 200 earpiece part, 300
code.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (4)

[Claims] 1. A mobile phone main body including a first antenna and a second antenna for receiving a radio signal including a voice signal, and based on a voice signal transmitted from the mobile phone main body,
An earpiece for outputting sound, an earpiece including a third antenna for receiving a radio signal including an audio signal, and a cord having one end connected to the earpiece, A main body, a connecting portion for connecting the other end of the cord; and, when the cord is connected to the connecting portion, diversity reception of the radio signal by the first antenna and the third antenna. An antenna diversity receiving apparatus further comprising a signal processing section for diversity receiving the radio signal by the first antenna and the second antenna when the cord is not connected to the connection section. 2. The antenna diversity receiving device according to claim 1, wherein said third antenna is a chip dielectric antenna formed of a high dielectric constant material. 3. The code secures a distance between the first antenna and the third antenna by at least λ / 3 to λ / 2 with respect to a wavelength λ of a radio signal to be received.
The antenna diversity receiver according to claim 2. 4. The mobile phone main unit includes: a first switching unit that electrically connects the second antenna or the third antenna to the signal processing unit in accordance with a connection state of the connection unit; An audio output circuit for outputting audio based on an output of the processing unit; and a second switch for transmitting an audio signal to one of the audio output circuit and the code in accordance with a connection state in the connection unit. The antenna diversity receiving device according to claim 1, further comprising a unit.