JPH09294104A - Antenna system and portable radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct excellent communication even when the antenna circuit is deteriorated due to the effect of a human body in the case that the antenna is retracted. SOLUTION: A 1st antenna 7 in the retracted state is energized so as to be acted like an antenna, and the 1st antenna 7 and a 2nd antenna 8 are operated independently in the retracted state. Thus, the diversity reception is conducted by using the 1st antenna 7 and the 2nd antenna 8, and even when the antenna characteristic of one antenna is deteriorated due to the effect of a human body in the retracted state, excellent communication is conducted by using a reception signal received by the other antenna.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD To which the present invention pertains [Prior Art (FIGS. 6 and 7)] Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (1) First Example (FIGS. 1 and 2) (2) ) Second embodiment (Figs. 3 and 4) (3) Other embodiments (Fig. 5)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device and a portable wireless device, and is particularly suitable for a small portable wireless device.

[0003]

2. Description of the Related Art In recent years, portable wireless devices have been reduced in size and weight in order to improve portability. Along with this, the antenna device is also required to be small. Therefore, a whip antenna has been actively developed that can be stored in the main body when carrying and can be used by pulling out from the main body when talking.

Here, a conventional example of such an antenna device will be described with reference to FIGS. Incidentally, FIG. 6 shows a state in which the antenna portion is pulled out, and FIG. 7 shows a state in which the antenna portion is housed. However, an overall view of the portable wireless device is omitted here, and only a portion near the antenna device will be described. First, the main body 2 of the portable wireless device 1 is made of a non-metallic material, and the circuit board 3 on which the transmission / reception circuit and the like necessary for the wireless device are mounted is housed inside. Further, the circuit board 3 is provided with a feeding circuit 5 for the antenna device 4. The power supply circuit 5 has a role of supplying power to the antenna device 4 through the conductive power supply spring 6 and a role of matching the characteristic impedance from the transmission / reception circuit with the input impedance of the antenna device 4.

Here, the antenna device 4 is composed of two antennas, a linear antenna 7 having a conductor formed in a straight line and a spiral antenna 8 having a conductor formed in a spiral.
The feature is that the two antennas are electrically separated. The spiral antenna 8 is attached to the upper end of the linear antenna 7 via the antenna cover 7A, whereby the spiral antenna 8 and the linear antenna 7 are arranged coaxially, and assembled as one antenna. Has been.
In this case, since the antenna cover 7A is formed of a non-conductive material, it functions as a spacer, and the spiral antenna 8 and the linear antenna 7 are electrically separated by this. Such an antenna device 4 is attached to the main body 2 by screwing the antenna support metal fitting 10 of the antenna device 4 into the antenna mounting metal fitting 9 incorporated in the main body 2.

Here, a concrete configuration of each part will be described below. First, the periphery of the linear antenna 7 is covered with a non-conductive antenna cover 7A, which prevents the linear antenna 7 from directly touching the human body when the antenna is pulled out. By the way, the antenna cover 7A is formed by the force applied from the outside when it is pulled out.
Also has a role of protecting the linear antenna 7 from being deformed. A metal antenna connection fitting 11 is provided at the lower end of the linear antenna 7. The antenna connection fitting 11 can prevent the linear antenna 7 from being pulled out by contacting the lower end portion of the antenna support fitting 10 with the part having a slightly thicker diameter when the antenna is pulled out. The antenna connection fitting 11 is held by the support spring 10A of the antenna support fitting 10 when the antenna is pulled out. As a result, the antenna portion is fixed in the antenna extended state as shown in FIG. At this time, the linear antenna 7 is electrically connected to the power supply spring 6 through the antenna connection fitting 11, the support spring 10A, the antenna support fitting 10, and the antenna mounting fitting 9 in this order. As a result, the linear antenna 7 operates as a monopole antenna with the ground conductor of the circuit board 3 and the shield case as the ground.

The upper end of the antenna cover 7A is extended upward and fitted into the shaft portion of a metallic antenna connecting fitting 12 formed in a T-shaped cross section. The spiral antenna 8 is electrically and mechanically connected to the upper end of the antenna connecting fitting 12 by crimping or the like. In this case, the spiral antenna 8 and the linear antenna 7 are connected to each other via the antenna cover 7A and the antenna connecting fitting 12, but the antenna cover 7A functions as a spacer, so that the spiral antenna 8 and the linear antenna 7 are connected. Are electrically separated.

The periphery of the spiral antenna 8 is covered with a non-conductive antenna cover 8A so that the spiral antenna 8 does not come into direct contact with the human body. The antenna cover 8A is formed of a moderately hard synthetic resin material, and also has a role of protecting the spiral antenna 8 so that the spiral antenna 8 is not deformed by a force applied from the outside. Incidentally, the antenna cover 8A is attached to the antenna connection fitting 12 by screwing.

The shaft portion of the antenna connection fitting 12 is clamped by the support spring 10A of the antenna support fitting 10 when the antenna is housed. As a result, the antenna portion is fixed in the antenna housed state as shown in FIG. At this time, the spiral antenna 8 is connected to the power supply spring 6 through the antenna connection fitting 12, the support spring 10A, the antenna support fitting 10, and the antenna mounting fitting 9 in this order. As a result, the spiral antenna 8
Operates as a helical antenna with the ground conductor of the circuit board 3 and the shield case as the ground. Incidentally, when the antenna is housed, the umbrella portion of the antenna connecting fitting 12 contacts the upper end portion of the antenna supporting fitting 10. This can prevent the antenna part from falling inside the portable wireless device 1.

In the antenna device 4 having such a structure, the linear antenna 7 is electrically connected to the power feeding spring 6 to operate as an antenna when the antenna is pulled out, and the spiral antenna 8 functions as the power feeding spring 6 when the antenna is housed. It is electrically connected and operates as an antenna. Therefore, when the antenna device 4 is used, radio waves can be transmitted and received by the spiral antenna 8 even when the antenna is housed, and the antenna characteristics are better than those of a whip antenna that can simply house the linear antenna. Obtainable.

[0011]

By the way, when a portable wireless device is held and used, the antenna characteristics generally tend to deteriorate due to the influence of the human body. Even if it is only held in the hand, if the portable wireless device is pressed against the ear to make a call, the antenna characteristics tend to be further deteriorated due to the influence of the human body. In general, the spiral antenna and the linear antenna tend to be more easily affected by the human body because the length of the antenna is shorter. Therefore, even if the antenna device 4 has the good characteristics when the antenna is housed by the spiral antenna 8, the antenna characteristics may deteriorate due to the influence of the human body when the antenna is housed, so that the antenna device is not yet available. There are insufficient points.

The present invention has been made in consideration of the above points, and an antenna device and a portable wireless device using the same which can perform good communication even if the antenna characteristics are deteriorated due to the influence of the human body when the antenna is housed. Is to propose.

[0013]

In order to solve such a problem, according to the present invention, a linear first antenna which can be housed and withdrawn and which operates as an antenna at the time of withdrawal, and the first antenna are housed. In the antenna device including the spiral second antenna that operates as an antenna when the storage is performed, the first antenna is operated as the antenna by feeding power to the first antenna that is stored. The first antenna and the second antenna operate independently as antennas.

In this way, the first antenna, which was operating as an antenna when it was pulled out, is made to operate as an antenna when it is housed, and when the antenna is housed, the first antenna and the second antenna operate independently as antennas. By doing so, diversity reception can be performed using the first antenna and the second antenna. As a result, even if the antenna characteristics of one antenna deteriorate due to the influence of the human body or the like when the antenna is housed, good communication can be performed by the received signal received by the other antenna.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) First Embodiment FIG. 1 in which parts corresponding to those in FIGS. 6 and 7 are designated by the same reference numerals.
In FIG. 2, reference numeral 20 generally indicates the portable wireless device according to the first embodiment, and reference numeral 21 generally indicates the antenna device according to the first embodiment. In this portable wireless device 20, as shown in FIG. 2, the linear antenna 7 is actuated as an antenna by feeding power also to the linear antenna 7 when the antenna is housed. Diversity reception is performed by two antennas, the linear antenna 8 and the linear antenna 7. As a result, in this portable wireless device 20,
It is possible to prevent the antenna characteristics from being deteriorated due to the influence of the human body when the antenna is housed and being unable to maintain a good communication state.

This point will be specifically described below while explaining the configuration of each part. However, here, the portable wireless device 2
Only the reception system part of 0 will be described. First, also in the case of this embodiment, the antenna device 21 is configured by two antennas, that is, the spiral antenna 8 in which the conductor is formed in a spiral shape and the linear antenna 7 in which the conductor is formed in a linear shape. . The spiral antenna 8 is attached to the upper end of the linear antenna 7 via the antenna cover 7A, whereby the spiral antenna 8 and the linear antenna 7 are arranged coaxially, and assembled as one antenna. Has been. In this case, since the antenna cover 7A is made of a non-conductive material, it functions as a spacer, and the spiral antenna 8 and the linear antenna 7 are electrically separated.

The antenna device 21 is attached to the main body 2 by screwing the antenna support metal fitting 10 of the antenna device 21 into the antenna mounting metal fitting 9 incorporated in the main body 2. In this case, the linear antenna 7 is attached so as to be slidable with respect to the antenna support metal fitting 10, whereby the linear antenna 7 can be housed in the main body 2 and The linear antenna 7 can be pulled out from the. An antenna protection straw 22 made of a non-metallic tubular member is provided at a storage position on the main body 2 side where the linear antenna 7 is stored, and the linear antenna 7 is stored in the antenna protection straw 22 during storage. It is stored in and protected.

A metallic power supply fitting 23 is attached to the lower end of the antenna protection straw 22. As shown in FIG. 2, the power supply fitting 23 is used when the antenna is stored.
The support spring 23A sandwiches the antenna connection fitting 24 of the linear antenna 7, and thereby the linear antenna 7 is electrically connected to the conductive power supply spring 25. Incidentally, the other end of the power supply fitting 23 is attached inside the main body 2 by a non-metal fixture 26.

A metallic antenna connecting fitting 24 is attached to the lower end of the linear antenna 7. When the antenna is pulled out, as shown in FIG.
The upper end of the antenna is clamped by the support spring 10A of the antenna support fitting 10. As a result, the linear antenna 7 is electrically connected to the feeding spring 6 via the support spring 10A, and operates as a monopole antenna with the ground conductor of the circuit board 3 and the shield case as the ground. Further, when the antenna is pulled out, a thicker diameter portion formed in the middle of the antenna connection fitting 24 contacts the lower end portion of the antenna support fitting 10. This can prevent the linear antenna 7 from pulling out.

Further, when the antenna is housed, as shown in FIG. 2, the lower end portion of the antenna connection fitting 24 is clamped by the support spring 23A of the power supply fitting 23. As a result, the linear antenna 7 is electrically connected to the feeding spring 25 and operates as an antenna. In this case, since the circuit board 3 exists in parallel with the linear antenna 7, the ground conductor and the shield case of the circuit board 3 are arranged in parallel with the linear antenna 7. Therefore, the linear antenna 7 has an inverted L shape with the ground conductor of the circuit board 3 and the shield case as the ground.
Acts as a type antenna. Incidentally, when the antenna is housed, the upper portion of the linear antenna 7 is clamped by the support spring 10A of the antenna support fitting 10 as shown in FIG. 2, but the periphery of the linear antenna 7 is a non-conductive antenna cover. Since it is covered with 7A, the linear antenna is not electrically connected to the feeding spring 6 via the support spring 10A.

On the other hand, a metallic antenna connecting fitting 12 is provided at the lower end portion of the spiral antenna 8. As shown in FIG. 2, the antenna connecting fitting 12 has a support spring 10A of the antenna supporting fitting 10 when the antenna is housed.
It is pinched by. As a result, the spiral antenna 8 is electrically connected to the feeding spring 6 via the support spring 10A,
It operates as a helical antenna with the ground conductor of the circuit board 3 and the shield case as the ground. Incidentally, when the antenna is pulled out, as shown in FIG.
, The spiral antenna 8 is not electrically connected to the feeding spring 6 and does not operate as an antenna.

Here, one end of the feeding spring 6 electrically connected to the antenna mounting member 9 is connected to the feeding circuit 5 formed on the circuit board 3. The power feeding circuit 5 is for matching the input impedance of the spiral antenna 8 or the linear antenna 7 with the characteristic impedance from the receiving circuit 29 described later, and the spiral antenna 8 is subjected to impedance matching. Alternatively, the linear antenna 7 is connected to the antenna switching switch 28. On the other hand, one end of a power supply spring 25 that supplies power to the linear antenna 7 via the power supply metal fitting 23 is connected to a power supply circuit 27 formed on the circuit board 3. The feeding circuit 27 is for matching the input impedance of the inverted L-shaped antenna formed by the linear antenna 7 and the characteristic impedance from the receiving circuit 29 described later. The inverted L-shaped antenna consisting of the linear antenna 7 is connected to the antenna switching switch 28.

The antenna switching switch 28 has a receiving circuit 29.
Is a switch for switching the antenna to be connected to, and when the linear antenna 7 is pulled out, it is switched to the side of the power supply spring 6 to connect the linear antenna 7 to the receiving circuit 29, In the state where 7 is housed, it is switched to either the feeding spring 6 or the feeding spring 25 side, and either the spiral antenna 8 or the inverted L-shaped antenna formed of the linear antenna 7 is connected to the receiving circuit 29. To do. The reception circuit 29 is a circuit that receives a reception signal received by an antenna connected to the feeding spring 6 side or an antenna connected to the feeding spring 25 side via the antenna switching switch 28 and demodulates the reception signal. .

Incidentally, although not particularly shown here,
On the circuit board 3, in addition to the reception system circuit shown in the figure, the reception level monitoring for monitoring the reception level of the antenna connected to the power supply spring 6 side and the reception level of the antenna connected to the power supply spring 25 side. A circuit (specifically, a detection circuit or the like) is provided, and the reception level monitoring circuit monitors the reception levels of both antennas and switches the antenna switching switch 28 to the antenna side having the higher reception level. Has been done.

For example, when the linear antenna 7 is pulled out, the linear antenna 7 is connected to the feeding spring 6 side,
No antenna is connected to the feeding spring 25 side.
In this case, in the reception level monitoring circuit, the power supply spring 6
Since the reception level obtained from the power supply spring 25 is naturally higher than the reception level obtained from the power supply spring 25 side, the power supply spring 6
It is determined that the linear antenna 7 connected to the side is more suitable. Therefore, the reception level monitoring circuit switches the antenna switching switch 28 to the power feeding spring 6 side. Further, when the linear antenna 7 is housed, the spiral antenna 8 is connected to the feeding spring 6 side, and the linear antenna 7 is fed to the feeding spring 2.
It is connected to the 5 side. In this case, the reception level fluctuates due to external factors such as the influence of the human body and fading, and the antenna with the higher reception level cannot be uniquely determined.
Since the reception level monitoring circuit constantly monitors the reception levels of both antennas, the antenna switching switch 28 is switched to the side of the antenna having the higher level instantaneously. As a result, a reception signal having a high signal level received by the antenna having a higher reception level can be supplied to the reception circuit 29,
It is possible to obtain good reception characteristics while avoiding the effects of the human body and fading.

In the above structure, when receiving the radio wave transmitted from the communication partner such as the base station, both the antenna connected to the power feeding spring 6 side and the antenna connected to the power feeding spring 25 side are received. The level is monitored by the reception level monitoring circuit, and the antenna switching switch 28 is driven to connect the antenna having the higher reception level to the reception circuit 29.
For example, when the linear antenna 7 is pulled out, the linear antenna 7 is connected to the antenna connection fitting 24, the antenna support fitting 10,
It is connected to the feeding spring 6 via the antenna mounting bracket 9, and no antenna is connected to the feeding spring 25 side. In this case, the reception level is naturally higher on the power supply spring 6 side, and therefore the reception level monitoring circuit connects the antenna switching switch 28 to the power supply spring 6 side. As a result, the receiving circuit 2
The reception signal received by the linear antenna 7 is supplied to the antenna 9, and good reception can be performed.

On the other hand, when the linear antenna 7 is housed, the linear antenna 7 is connected to the power supply spring 25 via the antenna connection fitting 24, the support spring 23A, and the power supply fitting 23, and the spiral antenna 8 is connected to the antenna. It is connected to the power supply spring 6 via the metal fitting 12, the antenna support metal fitting 10, and the antenna mounting metal fitting 9. In this case, the linear antenna 7 operates as an inverted L-shaped antenna with the ground conductor of the circuit board 3 and the shield case as the ground, and the spiral antenna 8 as a helical antenna with the ground conductor of the circuit board 3 and the shield case as the ground. Operate. In this state, the antenna having a high reception level is not uniquely determined, but the reception level monitoring circuit constantly monitors the reception level, and switches the antenna switching switch 28 to the side of the antenna having a higher level instantaneously. As a result, even when the linear antenna 7 is housed, one of the received signal received by the spiral antenna 8 and the received signal received by the linear antenna 7 having a higher signal level is supplied to the receiving circuit 29 for good reception. Can be done.

Incidentally, in the conventional case, the linear antenna 7
When it was stored, only the spiral antenna 8 was operating as an antenna. Therefore, when the antenna characteristics of the spiral antenna 8 are deteriorated due to the influence of the human body, good reception cannot be performed. However, in the case of this embodiment, when the linear antenna 7 is housed, power is fed to the linear antenna 7 using the feeding spring 25 and the feeding metal fitting 23, and the linear antenna 7 is used as an inverted L-shaped antenna. It is working. Therefore, the spiral antenna 8 and the linear antenna 7
Diversity reception can be performed by using two antennas including an inverted L-shaped antenna, and even if one antenna is affected by the human body and the antenna characteristics deteriorate, the reception processing is performed by the reception signal received by the other antenna. And good reception can be performed thereby.

According to the above structure, the housed linear antenna 7 is operated as an inverted L-shaped antenna by providing the power supply fitting 23 and the power supply spring 25 for supplying power to the housed linear antenna 7. Since the two antennas, the spiral antenna 8 and the linear antenna 7, are operated when the antenna is housed, diversity reception can be performed using the two operated antennas, and the antenna is affected by the human body when the antenna is housed. Therefore, even if the antenna characteristic of one antenna is deteriorated, good reception can be performed by the other antenna. Further, by using such an antenna device 21 to perform diversity reception, it is possible to realize the portable wireless device 20 that can perform good communication even if the antenna characteristics are deteriorated due to the influence of the human body when the antenna is housed.

(2) Second Embodiment FIG. 3 showing the parts corresponding to those in FIG. 1 and FIG.
Further, in FIG. 4, reference numeral 30 generally indicates the portable wireless device according to the second embodiment, and 31 generally indicates the antenna device according to the second embodiment. Also in the case of the second embodiment, the linear antenna 7 is operated as an antenna by feeding power to the linear antenna 7 when the antenna is housed, whereby the linear antenna 7 and the linear antenna 7 are linearly housed when the antenna is housed. Diversity reception is performed by the two antennas of the antenna 7. As a result, in the portable wireless device 30, it is possible to prevent the antenna characteristic from being deteriorated due to the influence of the human body when the antenna is housed, and being unable to maintain a good communication state. However, in the case of the second embodiment, the linear antenna 7 is operated as an inverted F type antenna when the antenna is housed.

This point will be specifically described below while explaining the configuration of each section. However, in the case of the second embodiment, since the antenna type operated by the linear antenna 7 when the antenna is housed is different from that of the first embodiment, only that portion will be described. First, also in the second embodiment, the antenna protection straw 22 made of a non-metallic tubular member is provided at the storage position on the main body 2 side where the linear antenna 7 is stored. A through hole having a predetermined size is provided at a predetermined position of the antenna protection straw 22, and the power feeding spring 32 is inserted into the through hole. As shown in FIG. 4, the feeding spring 32 has a predetermined position when the linear antenna 7 is housed (a distance d from one end of the linear antenna 7 in FIG. 4).
Conductive antenna connection portion 7 provided at a distance)
It is designed to contact B. In this case, the antenna connecting portion 7B is provided so as to be electrically connected to the linear antenna 7 covered by the antenna cover 7A, so that the linear antenna 7 is accommodated when it is stored.
Is electrically connected to the power supply spring 32 to supply power.

At the lower end portion of the antenna protection straw 22, a metal ground connection fitting 34 is provided. When the linear antenna 7 is housed, the ground connection fitting 34 holds the lower end portion of the antenna connection fitting 24 of the linear antenna 7 by the support spring 34A. In this case, the ground connection fitting 34 is attached to the circuit board 3 by soldering or the like so as to be electrically connected to the ground conductor of the circuit board 3. Therefore, when the ground connection fitting 34 sandwiches the antenna connection fitting 24 of the linear antenna 7, as a result, one end of the linear antenna 7 is grounded.

When the linear antenna 7 is housed in this way, when power is supplied to a predetermined position of the linear antenna 7 and one end of the linear antenna 7 is grounded, the linear antenna 7 operates as an antenna. To do. In this case, since the circuit board 3 exists in parallel with the linear antenna 7, the ground conductor and the shield case of the circuit board 3 are arranged in parallel with the linear antenna 7. In this way, when the linear antenna 7 is fed to a predetermined position, one end of the linear antenna 7 is grounded, and the ground conductor is arranged in parallel with the linear antenna 7, the linear antenna 7 becomes a circuit board. It operates as an inverted F-type antenna with the ground conductor of 3 and the shield case as the ground.

Here, one end of the power supply spring 32 for supplying power to the linear antenna 7 during storage is connected to a power supply circuit 33 formed on the circuit board 3. Like the power feeding circuit 5, the power feeding circuit 33 is for matching the input impedance of the inverted F-type antenna formed by the linear antenna 7 and the characteristic impedance from the receiving circuit 29. After matching, the inverted F-type antenna composed of the linear antenna 7 is connected to the antenna switching switch 28.

Also in this embodiment, the antenna switching switch 28 has the receiving circuit 29 which has the higher receiving level of the antenna connected to the feeding spring 6 and the antenna connected to the feeding spring 32. Connecting. Incidentally, also in the case of this embodiment, the reception level of the antenna connected to the feeding spring 6 side and the antenna connected to the feeding spring 32 side are provided on the circuit board 3 in addition to the receiving system circuit shown in the drawing. Is provided with a reception level monitoring circuit for monitoring the reception level of both antennas, and the antenna switching switch 28 is switched to the antenna side having the higher reception level. Has been done.

In the above structure, when receiving the radio wave transmitted from the communication partner, the reception levels of both the antenna connected to the power feeding spring 6 side and the antenna connected to the power feeding spring 32 side are received. Monitoring is performed by the monitoring circuit, and the antenna switching switch 28 is driven to connect the antenna having the higher reception level to the receiving circuit 29. For example, when the linear antenna 7 is housed, the linear antenna 7 is connected to the feeding spring 32, and the spiral antenna 8 is connected to the feeding spring 6. In this case, since one end of the linear antenna 7 is grounded to the ground conductor of the circuit board 3 via the ground connection fitting 34, the linear antenna 7 operates as an inverted F-type antenna having the ground conductor as the ground, and the spiral antenna 8 is a circuit. It operates as a helical antenna with the ground conductor of the substrate 3 as the ground.

In this state, an antenna having a high reception level cannot be uniquely determined due to the influence of the human body and external factors such as fading, but the reception level monitoring circuit constantly monitors the reception level, and The antenna switching switch 28 is instantly switched to the antenna side having the higher level. As a result, one of the received signal received by the spiral antenna 8 and the received signal received by the linear antenna 7 having a higher signal level can be supplied to the receiving circuit 29 to perform good reception.

That is, in the case of this embodiment, when the antenna is housed, the spiral antenna 8 is operated as a helical antenna and the linear antenna 7 is operated as an inverted F-type antenna so that diversity reception is performed. There is. As a result, even if one antenna is affected by the human body and its antenna characteristics deteriorate, it is possible to perform reception processing using the received signal received by the other antenna, and avoid deterioration of the antenna characteristics for good reception. Can be done.

According to the above construction, the feeding spring 32 for feeding power to the predetermined position of the housed linear antenna 7 and the ground connecting fitting 34 for grounding one end of the housed linear antenna 7 are provided. Thus, the accommodated linear antenna 7 is operated as an inverted F type antenna, and when the antenna is accommodated, the two antennas of the spiral antenna 8 and the linear antenna 7 are operated, so that the two operated antennas are operated. Diversity reception can be performed using an antenna, and even if the antenna characteristics of one antenna deteriorate due to the influence of the human body when the antenna is housed, the other antenna can perform good reception. In addition, if the antenna device 31 is used for diversity reception, the portable wireless device 3 can perform good communication even if the antenna characteristics are deteriorated due to the influence of the human body when the antenna is housed.
0 can be achieved.

(3) Other Embodiments In the above-described first embodiment, the antenna support fitting 1
The case where the electrical connection is obtained by sandwiching the antenna connection fitting 24 and the antenna connection fitting 12 by the support spring 10A of 0 and the support spring 23A of the power supply fitting 23 has been described, but the present invention is not limited to this. Alternatively, the electrical connection may be obtained by other connection structure such as obtaining the electrical connection by mechanical fitting. Similarly, the above second
In the embodiment, the feeding spring 32 mechanically contacts the antenna connecting portion 7B of the linear antenna 7 to obtain an electrical connection, and the supporting spring 34A of the ground connecting fitting 34 allows the antenna connecting fitting. Although the case where the electrical connection is obtained by sandwiching 24 has been described, the present invention is not limited to this, and other connection structures such as obtaining the electrical connection by mechanical fitting are provided. You may make it obtain an electrical connection.

Further, in the above-described first embodiment, the antenna connection fitting 24 and the antenna connection fitting 12 are sandwiched by the support spring 10A of the antenna support fitting 10 and the support spring 23A of the power feed fitting 23 to make an electrical connection. However, the present invention is not limited to this, and electrical connection may be obtained by electromagnetic coupling. Similarly, in the above-described second embodiment, the power supply spring 32 mechanically contacts the antenna connection portion 7B of the linear antenna 7 to obtain an electrical connection, and at the same time, the support spring 34A of the ground connection fitting 34 is connected to the support spring 34A. Therefore, although the case where the electrical connection is obtained by sandwiching the antenna connection fitting 24 has been described, the present invention is not limited to this, and the electrical connection may be obtained by electromagnetic coupling. In short, if stable electrical connection can be obtained, the same effect as the above case can be obtained even if other connection structures are used.

In the first embodiment described above, the case where the power supply fitting 23 is attached to the main body 2 of the portable radio device 20 has been described, but the present invention is not limited to this, and the power supply fitting 23 is attached to the circuit board 3. You may do it. In short, the same effect can be obtained even if the power supply metal fitting 23 is provided at another position as long as the antenna connection metal fitting 24 of the linear antenna 7 can be reliably held.

Further, in the above-described second embodiment, the case where the ground connecting fitting 34 is provided on the circuit board 3 has been described, but the present invention is not limited to this, and the ground connecting fitting 34 is not limited to this.
May be provided in a shield case or the like. In short,
Even if the ground connecting metal fitting 34 is provided at another position as long as it is mechanically surely connected to the antenna connecting metal fitting 24 of the linear antenna 7 and one end of the linear antenna 7 is surely grounded. The effect can be obtained.

Further, in the above-mentioned second embodiment, the case where the characteristic impedance of the receiving circuit 29 and the input impedance of the inverted F type antenna composed of the linear antenna 7 are matched by the feeding circuit 33 has been described. The invention is not limited to this, but the power feeding position (d) with respect to the linear antenna 7 may be adjusted to achieve matching, and the power feeding circuit 33 may be simplified. In general, in the case of an inverted F-type antenna, the input impedance changes by changing the feeding position, so if the input impedance is adjusted by adjusting the feeding position, matching can be easily achieved. Because you can

Further, in the above-described embodiment, the spiral antenna 8 is connected to the upper end of the linear antenna 7 and the spiral antenna 8 is electrically separated when the antenna is pulled out, so that the antenna devices 21 and 31 of the type are not operated. The case where the present invention is applied is described above, but the present invention is not limited to this, and as shown in FIG. 5, the spiral antenna 8 is fixed to the antenna support fitting 10, and the spiral antenna 8 always operates as an antenna. Even if the present invention is applied to the antenna device 41 of such a type, it is possible to obtain the same effect as the above case. In short, in the antenna device provided with a linear antenna that can be stored and withdrawn and that operates as an antenna when withdrawn, and a spiral antenna that operates as an antenna when the linear antenna is housed, the housed line By feeding the linear antenna, the stored linear antenna is operated as an antenna,
If both the spiral antenna and the linear antenna operate independently as antennas when the antennas are housed, diversity reception can be performed using the two antennas, and the same effect as the above case can be obtained.

Further, in the above-mentioned embodiment, only the receiving operation has been described, but the feeding operation is performed for the transmitting operation.
If a transmission signal is supplied to the spiral antenna 8 or the linear antenna 7 via the, the transmission signal can be transmitted from the spiral antenna 8 or the linear antenna 7.

[0048]

As described above, according to the present invention, by feeding the stored first antenna to operate the stored first antenna as an antenna, the first antenna is stored when the antenna is stored. Since the first antenna and the second antenna operate independently as an antenna, diversity reception can be performed using the first antenna and the second antenna, and the antenna is affected by the human body when the antenna is stored. Good communication can be performed even if the characteristics deteriorate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connection state of respective parts when an antenna device according to a first embodiment is pulled out.

FIG. 2 is a cross-sectional view showing a connection state of each part when the antenna device according to the first embodiment is stored.

FIG. 3 is a cross-sectional view showing a connected state of each part when the antenna device according to the second embodiment is pulled out.

FIG. 4 is a cross-sectional view showing a connected state of each part when the antenna device according to the second embodiment is stored.

FIG. 5 is a cross-sectional view showing a connection state of each part when the antenna device according to another embodiment is stored.

FIG. 6 is a cross-sectional view showing a connection state of each part when the conventional antenna device is pulled out.

FIG. 7 is a cross-sectional view showing a connected state of each part when the conventional antenna device is stored.

[Explanation of symbols]

1, 20, 30, 40 ... Portable radio, 2 ... Main body, 3
...... Circuit board, 4, 21, 31, 41 ...... Antenna device, 5, 27, 33 …… Feeding circuit, 6, 25, 32 ……
Feeding spring, 7 ... Linear antenna, 8 ... Spiral antenna, 9 ... Antenna mounting bracket, 10 ... Antenna supporting bracket, 11, 12, 24 ... Antenna connecting bracket, 22 ...
Antenna protection straw, 23 ... power supply fitting, 28 ... antenna switching switch, 29 ... receiving circuit, 34 ... ground connecting fitting.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Kuroda 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (6)

[Claims] 1. A linear first antenna that can be stored and withdrawn and that operates as an antenna when withdrawn, and a spiral second antenna that operates as an antenna when the first antenna is stored. In the antenna device, the first antenna is operated as an antenna by feeding power to the first antenna that is housed, so that the first antenna and the second antenna are antennas when housed. An antenna device that operates independently as. 2. The first antenna housed by arranging a ground conductor in parallel with the housed first antenna while feeding power to a predetermined position of the housed first antenna. The antenna device according to claim 1, which is operated as an inverted L-shaped antenna. 3. An electric power is supplied to a predetermined position of the housed first antenna, one end of the housed first antenna is grounded, and a grounding conductor is provided in parallel with the housed first antenna. The first stored by arranging
The antenna device according to claim 1, wherein the antenna is operated as an inverted F-type antenna. 4. A linear first antenna that can be stored and withdrawn and that operates as an antenna when withdrawn, and a spiral second antenna that operates as an antenna when the first antenna is stored. In a portable wireless device having an antenna device, the first antenna operates independently as an antenna by operating the first antenna as an antenna by feeding power to the first antenna stored therein. And a second antenna for performing diversity reception. 5. The first antenna housed by arranging a ground conductor in parallel with the housed first antenna while feeding power to a predetermined position of the housed first antenna. The portable wireless device according to claim 4, which operates as an inverted L-shaped antenna. 6. An electric power is supplied to a predetermined position of the housed first antenna, one end of the housed first antenna is grounded, and a grounding conductor is provided in parallel with the housed first antenna. The first stored by arranging
2. The portable wireless device according to claim 1, wherein the antenna is operated as an inverted F-type antenna.