JPH07235819A - Antenna system for radio equipment - Google Patents

Abstract

PURPOSE:To realize an excellent impedance matching state respectively in the case of antenna extension or antenna containment without causing cost increase and weight increase. CONSTITUTION:A main body 3 of the radio equipment antenna system provided with an antenna 2 can be contained in the main body 3 is provided with an impedance matching circuit 1a in matching with the extension of the antenna 2. The antenna system is provided with an impedance matching correction circuit 4a to form an impedance matching circuit in matching with the state of the contained antenna 2 in cooperation with an impedance matching circuit 1a by connecting the impedance matching circuit 1a to the antenna 2 when the antenna 2 is contained in the main body 3.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Prior Art (FIGS. 11 to 12) Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 4) Working Example 1st Example (FIGS. 5 to 7) -Explanation of the second embodiment (FIG. 8) -Explanation of the third embodiment (FIG. 9) -Explanation of the fourth embodiment (FIG. 10)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio antenna device having an antenna that can be stored in a main body.

[0003]

2. Description of the Related Art Conventionally, an expandable antenna (whipped antenna) used for a radio device or the like is shown in FIG.
As shown in (a) and (b), an impedance matching circuit 1 that performs impedance matching during radio reception is provided. This impedance matching circuit 1 is shown in FIG.
When the antenna 2 as shown in FIG.
The antenna 2 is in contact with the antenna 2 regardless of whether the antenna 2 is extended as shown in (b).
Impedance matching can be performed.

However, since the length of the antenna 2 protruding from the radio main body 3 is different between the time when the antenna 2 is extended and the time when the antenna 2 is stored, only one impedance matching circuit 1 is used for both the time when the antenna 2 is extended and the time when the antenna 2 is stored. Matching is difficult. By the way, in order to solve such a problem, as shown in FIGS. 12A and 12B, the second impedance matching circuit 1a adapted to the impedance characteristic when the antenna 2 is extended is provided in the radio main body 3. And a first impedance matching circuit 1b that matches the impedance characteristics of the antenna 2 when it is housed, and these can be switched by a switching means (switch) 14 according to the state of the antenna 2.

That is, when the antenna shown in FIG. 12 (a) is housed, the switching means 14 is switched to the first impedance matching circuit 1b side so that the first impedance matching circuit 1b is connected to the antenna 2 and FIG. 12 (b). On the contrary, when the antenna is extended as shown in (1), the switching means 14 is switched to the second impedance matching circuit 1a side to connect the antenna 2 and the second impedance matching circuit 1a, regardless of the state of the antenna 2. Therefore, good impedance characteristics can be obtained.

[0006]

However, such a conventional antenna device requires a plurality of different impedance matching circuits and switching means for switching between these impedance matching circuits, which complicates the antenna device. There is a problem in that costs and weight increase.

Further, when one impedance matching circuit is used, it is difficult to perform impedance matching because it is affected by the other impedance matching circuit. The present invention was devised in view of such a problem, and it is possible to realize a good impedance matching state in each of the antenna extended state and the antenna retracted state without incurring an increase in cost or weight. An object is to provide an antenna device for a wireless device.

[0008]

[Means for Solving the Problems] FIGS. 1 (a) and 1 (b) are
All are the 1st principles explanatory drawing of the present invention concerning Claims 1-3, (a) is a figure showing the antenna stowage state,
(B) is a figure which shows an antenna extension state. This Figure 1
In (a) and (b), 1a is an impedance matching circuit, and this impedance matching circuit 1a matches the characteristics when the antenna is extended. Reference numeral 2 is an antenna, and 3 is a radio main body (hereinafter, simply referred to as a main body).

Reference numeral 4a denotes an impedance matching correction circuit. As shown in FIG. 1 (a), the antenna 2 is connected to the impedance matching circuit 1a when housed in the main body 3, whereby the impedance matching circuit 1a and the impedance matching circuit 1a are connected. The impedance matching is performed in cooperation with each other when the antenna 2 is stored. 5 is the antenna element for storage,
Reference numeral 6 is an extension antenna element that is electrically separated from the storage antenna element 5, and the antenna 2 is composed of these antenna elements 5 and 6.

Further, the impedance matching correction circuit 4a
Is connected to the storage antenna element 5.
The impedance matching correction circuit 1a is configured to be grounded when the antenna 2 is housed in the main body 3. 2A and 2B are explanatory diagrams of the second principle of the present invention according to claims 4 to 6, wherein FIG. 2A is a diagram showing a state where the antenna is housed, and FIG. It is a figure which shows a state. In FIGS. 2A and 2B, 1b is an impedance matching circuit, and the impedance matching circuit 1b is suitable for the characteristics when the antenna is housed. 2 is an antenna and 3 is a main body.

Reference numeral 4b denotes an impedance matching correction circuit, which is connected to the impedance matching circuit 1b when the antenna 2 extends from the main body 3 as shown in FIG. 2 (b), whereby the impedance matching circuit 1b cooperates. It works to perform impedance matching which is adjusted when the antenna 2 is extended. 5 is the antenna element for storage,
Reference numeral 6 is an extension antenna element that is electrically separated from the storage antenna element 5, and the antenna 2 is composed of these antenna elements 5 and 6.

Further, the impedance matching correction circuit 4b
Is connected to the extension antenna element 6. The impedance matching correction circuit 4b is grounded when the antenna 2 is extended from the main body 3. 3A and 3B are explanatory diagrams of the third principle of the present invention according to claims 7 to 9, wherein FIG. 3A is a diagram showing a state in which the antenna is housed, and FIG. It is a figure which shows a state. In FIGS. 3A and 3B, 1a is a second impedance matching circuit, 1b is a first impedance matching circuit, and a second impedance matching circuit 1a.
Is suitable for the characteristics when the antenna is extended. The first impedance matching circuit 1b is suitable for the characteristics when the antenna is housed. Reference numeral 2 is an antenna, and 3 is a radio main body.

Reference numeral 5 denotes a storage antenna element, 6 denotes an extension antenna element which is electrically separated from the storage antenna element 5, and the antenna 2
Is composed of these antenna elements 5 and 6. The first impedance matching circuit 1b is connected to the antenna element 5 for storage, and the second impedance matching circuit 1a is connected to the antenna element 6 for extension.
It is connected to the. The first impedance matching circuit 1b is grounded when the antenna 2 is housed in the main body 3, and the second impedance matching circuit 1a is grounded when the antenna 2 is extended from the main body 3. .

4 (a) and 4 (b) are all claims
It is a 4th principle explanatory drawing of this invention concerning 0-12,
(A) is a figure which shows an antenna accommodation state, (b) is a figure which shows an antenna extension state. In FIGS. 4A and 4B, 1 is an impedance matching circuit, 2 is an antenna, and 3 is
Is the body. Reference numeral 4a denotes a first impedance matching correction circuit, which is connected to the impedance matching circuit 1 when the antenna 2 is housed in the main body 3 as shown in FIG. It works to perform impedance matching which is adjusted when the antenna 2 is stored.

Reference numeral 4b is a second impedance matching correction circuit, and as shown in FIG. 4 (b), the antenna 2 is connected to the impedance matching circuit 1 when extended from the main body 3, whereby the impedance matching circuit 1 is connected. The impedance matching is performed in cooperation with the antenna 2 when the antenna 2 is extended. When the antenna 2 is housed in the main body 3, the first impedance matching correction circuit 4a is grounded, and when the antenna 2 is extended from the main body 3, the second impedance matching correction circuit 4a is
The impedance matching correction circuit 4b is configured to be grounded.

[0016]

In the antenna device for a wireless device of the present invention according to claim 1 described above, the impedance matching circuit 1a includes the antenna 2
Since the antenna is aligned when it is extended, the antenna 2
When it is extended from, impedance matching is achieved in this state. Further, when the antenna 2 is housed in the main body 3, the impedance matching circuit 1a and the impedance matching correction circuit 4a are connected to form an impedance matching circuit adapted when the antenna 2 is housed. As a result, good impedance matching can be achieved even when the antenna 2 is stored.

Further, in the above-described wireless device antenna apparatus according to the present invention, when the antenna 2 is housed in the main body 3, the impedance matching correction circuit 4a is grounded. In the antenna device for a wireless device according to the third aspect of the invention, when the antenna 2 is housed, the impedance matching correction circuit 4 is arranged with respect to the housed antenna element 5.
Impedance matching is achieved between a and the impedance matching circuit 1a.

Further, in the antenna device for a wireless device according to the present invention described in claim 4, since the impedance matching circuit 1b is adjusted when the antenna 2 is housed, when the antenna 2 is housed in the main body 3, impedance matching is performed. Is taken. Further, when the antenna 2 is extended from the main body 3, the impedance matching circuit 1b and the impedance matching correction circuit 4b are connected to each other to form the impedance matching circuit 1b which is matched when the antenna 2 is extended. As a result, good impedance matching is achieved even when the antenna 2 is extended.

In the antenna device for a radio device according to the present invention as described in claim 5, when the antenna 2 is extended from the main body 3, the impedance matching correction circuit 4b is grounded. Further, in the radio device antenna apparatus according to the present invention as set forth in claim 6, when the antenna 2 is extended, the impedance matching correction circuit 4 is provided to the extension antenna element 6.
Impedance matching is achieved between b and the impedance matching circuit 1b.

In the antenna device for a wireless device of the present invention as set forth in claim 7, when the antenna 2 is housed in the main body 3, impedance matching is performed by the first impedance matching circuit 1b which is fitted when the antenna 2 is housed. When the antenna 2 is extended from the main body 3, impedance matching is achieved by the second impedance matching circuit 1a which is matched when the antenna 2 is extended.

In the radio device antenna apparatus according to the present invention as described in claim 8, when the antenna 2 is housed in the main body 3, the first impedance matching circuit 1b is grounded and the antenna 2 is extended from the main body 3. Then, the second impedance matching circuit 1a is grounded. Further, in the radio device antenna apparatus according to the present invention as set forth in claim 9, when the antenna 2 is housed, impedance matching is achieved by the first impedance matching circuit 1b with respect to the housed antenna element 5, and the antenna 2 is expanded. At times, the second impedance matching circuit 1a performs impedance matching with the extension antenna element 6.

In the antenna device for a wireless device according to the present invention as set forth in claim 10, when the antenna 2 is housed in the main body 3, the first impedance matching correction circuit 4a provided in the antenna 2 causes the main body 3 to operate. Is connected to the impedance matching circuit 1 provided in, and the impedance matching circuit 1 is configured to cooperate with the impedance matching circuit 1 to accommodate the antenna 2 when the antenna 2 is housed. Further, when the antenna 2 is extended from the main body 3, the second impedance matching correction circuit 4b provided in the antenna 2 is connected to the impedance matching circuit 1 provided in the main body 3 and cooperates with the impedance matching circuit 1. Working together, an impedance matching circuit adapted when the antenna 2 is extended is constructed.

Further, in the above-described antenna device for a wireless device according to the present invention, when the antenna 2 is housed in the main body 3, the first impedance matching correction circuit 4a is grounded and the antenna 2 is removed from the main body 3. When extended, the second impedance matching correction circuit 4b is grounded. Further, in the radio device antenna apparatus according to the present invention as set forth in claim 12, when the antenna 2 is housed, the first impedance matching correction circuit 4 is provided to the housing antenna element 5.
Impedance matching is achieved between a and the impedance matching circuit 1. Further, when the antenna 2 is extended, the second antenna impedance matching correction circuit 4b and the impedance matching circuit 1 are impedance-matched to the antenna element 6 for extension.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment First, the first embodiment of the present invention will be described. FIG. 5 is an overall configuration diagram schematically showing its configuration, and FIG. 6 is a diagram schematically showing its circuit configuration. FIG. 7 is a schematic diagram for explaining the action, showing the state when the antenna is extended.

In FIG. 5, 1 is an impedance matching circuit, 2 is an antenna, and 3 is a main body of a radio device. The impedance matching circuit 1 is a circuit for matching the impedance of radio waves transmitted and received by the antenna 2, and is connected to the antenna 2. Further, the antenna 2 is configured to be housed inside the main body 3, and is used by being extended from the main body 3 as needed.

Reference numerals 4a and 4b are first and second impedance matching correction circuits, 5 is an antenna element for storage, and 6 is an antenna element for extension. The first impedance matching correction circuit 4a corrects impedance matching in accordance with the characteristics of the antenna 2 when it is housed. When the antenna 2 is housed in the main body 3, the first impedance matching correction circuit 4a It is adapted to be connected to the matching circuit 1.

The storage antenna element 5 is
An antenna element for receiving radio waves when the antenna 2 is housed in the main body 3, and as shown in FIG.
The coil 2 is provided above the antenna 2.
The antenna element 5 for storage and the first impedance matching correction circuit 4a are connected in the antenna 2, and the antenna 2 is housed in the main body 3 to move the first impedance matching correction circuit 4a into the impedance matching circuit 1. When the antenna 2 is connected to the impedance matching circuit 1 and the first impedance matching correction circuit 4a, the impedance matching circuit 1 and the impedance matching circuit 4a are adapted to perform impedance matching that is matched when the antenna 2 is housed.

Further, the second impedance matching correction circuit 4
b is for correcting the impedance matching according to the characteristics of the antenna 2 when it is extended. When the antenna 2 is extended from the main body 3, the second impedance matching correction circuit 4b is connected to the impedance matching circuit 1. It has become so. The extension antenna element 6 is an antenna element for receiving radio waves when the antenna 2 is extended from the main body 3, and is linearly provided below the antenna 2 as shown in FIG. The antenna element 5 for storage and the antenna element 6 for extension are kept electrically separated.

In the antenna 2, the extension antenna element 6 and the second impedance matching correction circuit 4b are connected to each other. By extending the antenna 2 from the main body 3, the impedance of the second impedance matching correction circuit 4b is changed. When connected to the matching circuit 1, the impedance matching circuit 1 and the second impedance matching correction circuit 4b cooperate with each other to perform impedance matching matched when the antenna 2 is extended.

By the way, the first and second impedance matching correction circuits 4a and 4b and the impedance matching circuit 1 are
As shown in FIG. 6, it is composed of inductors 9a, 9b, 9 and capacitors (capacitors) 10a, 10b, 10, and each antenna element 5, 6 has an inductor 9a of each impedance matching correction circuit 4a, 4b. , 9b.

Further, a slip ring 11 as a contact means as shown in FIG. 7 is provided at each connection portion of the antenna 2 between the first and second impedance matching correction circuits 4a and 4b and the impedance matching circuit 1. ing. The slip ring 11 is a half-divided contact conductor composed of two contact conductors 11a and 11b as shown in FIG. 7, and one contact conductor is a contact conductor for power supply (slip ring for power supply) 11a or 11b. And the other contact conductor is the ground contact conductor (ground slip ring)
11b or 11a.

On the side of the main body 3, a power supply contact fitting 12 is provided.
And a ground contact fitting 13 are provided, the power supply contact fitting 12 is connected to the impedance matching circuit 1, and the ground contact fitting 13 is grounded. By storing or extending the antenna 2, the power supply slip ring 11a contacts the power supply contact fitting 12 and the ground slip ring 11b contacts the ground contact fitting 13.
The impedance matching circuit 1 is connected to the first impedance matching correction circuit 4a or the second impedance matching correction circuit 4b.

Reference numeral 7 is an RF circuit provided in the main body 3,
Reference numeral 8 is a printed circuit board. Since the radio device antenna apparatus according to the first embodiment of the present invention is configured as described above, when the antenna 2 is housed and used as shown in FIG. By storing,
The first impedance matching correction circuit 4a is connected to the impedance matching circuit 1 to form an impedance matching circuit suitable for housing the antenna 2. As a result, good antenna characteristics can be secured even when the antenna is stored and used.

When the antenna 2 is extended and used, as shown in FIG. 7, by extending the antenna 2 from the main body 3, the second impedance matching correction circuit 4b is obtained.
Is connected to the impedance matching circuit 1 and the antenna 2
It becomes an impedance matching circuit suitable for the expansion of. As a result, good antenna characteristics can be secured even when the antenna 2 is extended and used.

As described above, in the present apparatus, the first and second antennas are arranged in the antenna 2 according to the stored / extended state of the antenna 2.
Since the impedance matching correction circuits 4a and 4b are provided and these first and second impedance matching correction circuits 4a and 4b are surely connected to the impedance matching circuit 1 in accordance with the state of the antenna 2, the use state of the radio device A good impedance characteristic can be obtained regardless of.

Further, the impedance matching correction circuit 4 can be provided without using a conventional switching means such as a switch.
Since a and 4b can be switched, cost and weight can be reduced. Further, the first impedance matching correction circuit 4a or the second impedance matching correction circuit 4b is connected to the ground slip ring 11 of the contact means 11.
Since it is grounded via b, the capacitor 10
Since a parallel circuit in which a and 10b are connected in parallel can be used as a matching circuit, and fine adjustment of impedance matching can be easily performed, impedance matching can be surely corrected, and good antenna characteristics can be obtained. Can be secured. The inductors 9a and 9b and the capacitor 10
Fine adjustment of impedance matching is difficult in a series circuit in which a and 10b are connected in series.

(B) Description of Second Embodiment Next, a second embodiment of the present invention will be described. FIG. 8 is an overall configuration diagram schematically showing its configuration. In FIG.
The same reference numerals as those in FIG. 5 indicate substantially the same as those in the first embodiment. As shown in FIG. 8, the main body 3 is provided with an impedance matching circuit 1a. The impedance matching circuit 1a is configured to perform impedance matching suitable for the extension of the antenna 2. Further, the antenna 2 is provided so as to be housed in the main body 3, and when the antenna 2 is extended, the impedance matching circuit 1a and the linear extension antenna element 6 provided in the antenna 2 are directly connected. It is supposed to be done.

Further, an impedance matching correction circuit 4a for correcting the impedance matching suitable when the antenna 2 is housed is provided in the antenna 2 and is connected to the coil-shaped housing antenna element 5. When the antenna 2 is stored, the impedance matching correction circuit 4a is connected to the impedance matching circuit 1a. As a result, impedance matching suitable for the characteristics when the antenna is housed is performed. In addition, as shown in FIG.
The impedance matching correction circuit 4a is grounded when it is stored in.

The storage antenna element 5 and the extension antenna element 6 are arranged in an electrically separated state. The structure of the second embodiment other than the above is the same as that of the first embodiment. Since the radio device antenna apparatus according to the second embodiment of the present invention is configured as described above, when the antenna 2 is stored and used, as shown in FIG. By housing the impedance matching correction circuit 4a, the impedance matching correction circuit 4a is connected to the impedance matching circuit 1a, and an impedance matching circuit suitable for housing the antenna 2 is obtained. Therefore, impedance matching is performed according to the characteristics of the antenna 2 when it is stored. As a result, good antenna characteristics can be secured even when the antenna is stored and used.

When the antenna 2 is extended and used, the extension antenna element 6 is directly connected to the impedance matching circuit 1a by extending the antenna 2 from the main body 3 to extend the antenna 2 when the antenna 2 is extended. Impedance matching is performed according to the characteristics of. As a result, good antenna characteristics can be secured even when the antenna 2 is extended and used.

Thus, in this second embodiment, the main body 3
By providing the impedance matching circuit 1a for the extension of the antenna 2 and the impedance matching correction circuit 4a for correcting the impedance matching when the antenna 2 is housed in the antenna element 5 for housing in the antenna 2, Therefore, good impedance characteristics can be obtained regardless of the storage / extension state of No. 2.

Also, the impedance matching circuit 1a for extending the antenna 2 and the impedance matching circuit for housing the antenna 2 (here, the impedance matching circuit is used) without using a conventional switching means such as a switch. 1a and the circuit including the impedance matching correction circuit 4a) can be switched, so that cost and weight can be reduced.

Further, the impedance matching correction circuit 4a
Is grounded via the grounding slip ring 11b of the contact means 11, so that a parallel circuit in which the capacitors 10a are connected in parallel can be used as a matching circuit, whereby fine adjustment of impedance matching can be easily performed. Therefore, the impedance matching can be surely corrected, and good antenna characteristics can be secured. In addition,
In a series circuit in which the inductor 9a, the capacitor 10a, etc. are connected in series, it is difficult to finely adjust the impedance matching.

(C) Description of Third Embodiment Next, a third embodiment of the present invention will be described. FIG. 9 is an overall configuration diagram schematically showing its configuration. In FIG.
The same reference numerals as those in FIG. 5 indicate substantially the same as those in the first embodiment. As shown in FIG. 9, the main body 3 is provided with an impedance matching circuit 1b. The impedance matching circuit 1b is configured to perform impedance matching suitable for housing the antenna 2. Further, the antenna 2 is provided so as to be housed in the main body 3, and when the antenna 2 is housed, the impedance matching circuit 1b and the coil-shaped housing antenna element 5 provided in the antenna 2 are connected. It has become so.

In the antenna 2, an impedance matching correction circuit 4b for correcting the impedance matching suitable for the extension of the antenna 2 is provided and is connected to the linear extension antenna element 6. When the antenna 2 is extended, the impedance matching correction circuit 4b is connected to the impedance matching circuit 1b. As a result, impedance matching that matches the characteristics when the antenna is extended is performed. As shown in FIG. 9, when the antenna 2 is extended from the main body 3, the impedance matching correction circuit 4b is grounded.

The storage antenna element 5 and the extension antenna element 6 are arranged in an electrically separated state. The structure of the third embodiment other than the above is the same as that of the first embodiment.
A radio antenna device according to a third embodiment of the present invention is
Since the antenna 2 is housed in the main body 3 when the antenna 2 is housed and used, the housing antenna element 5 is directly connected to the impedance matching circuit 1b. Thus, impedance matching is performed according to the characteristics of the antenna 2 when it is stored. As a result, good antenna characteristics can be secured even when the antenna is stored and used.

When the antenna 2 is extended and used, as shown in FIG. 9, by extending the antenna 2 from the main body 3, the impedance matching correction circuit 4b is connected to the impedance matching circuit 1b, and the antenna The impedance matching circuit becomes suitable when the antenna 2 is extended, and impedance matching is performed according to the characteristics when the antenna 2 is extended. As a result, good antenna characteristics can be secured even when the antenna 2 is extended and used.

Thus, in this third embodiment, the main body 3
The antenna 2 is provided with an impedance matching circuit 1b adapted to accommodate the antenna 2, and the antenna element 6 for extension in the antenna 2 is provided with an impedance matching compensation circuit 4b adapted to compensate impedance matching when the antenna 2 is extended. Therefore, good impedance characteristics can be obtained regardless of the storage / extension state of No. 2.

Also, the impedance matching circuit 1b for housing the antenna 2 and the impedance matching circuit for expanding the antenna 2 (here, the impedance matching circuit is used) without using conventional switching means such as a switch. 1b and a circuit composed of the impedance matching correction circuit 4b) can be switched, so that cost and weight can be reduced.

Further, the impedance matching correction circuit 4b
Is grounded via the ground slip ring 11b of the contact means 11, so that a parallel circuit in which the capacitors 10b are connected in parallel can be used as a matching circuit, whereby fine adjustment of impedance matching can be easily performed. Therefore, the impedance matching can be surely corrected, and good antenna characteristics can be secured. In addition,
In a series circuit in which the inductor 9b, the capacitor 10b, etc. are connected in series, it is difficult to finely adjust the impedance matching.

(D) Description of Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG.
10 is an overall configuration diagram schematically showing the configuration, and FIG.
In the figure, the same reference numerals as those in FIG. 5 indicate substantially the same as those in the first embodiment. As shown in FIG. 10, the antenna 2 is provided in the main body 3 so that the antenna 2 can be stored therein.
A first impedance matching circuit 1b that performs impedance matching when the antenna 2 is housed and a second impedance matching circuit 1a that performs impedance matching when the antenna 2 is extended are provided.

Inside the antenna 2, there are provided an electrically separated coil-shaped antenna element 5 for storage and a linear antenna element 6 for storage, and the storage antenna element 5 is 1 Antenna matching element 1 connected to impedance matching circuit 1b
Are connected to the second impedance matching circuit 1a.

When the antenna 2 is housed in the main body 3, the first impedance matching circuit 1b is connected to the RF circuit 7 of the main body to perform impedance matching, and when the antenna 2 is extended, the second impedance matching circuit 1b is used. The matching circuit 1a is connected to the RF circuit 7 of the main body for impedance matching. The structure of the fourth embodiment other than the above is the same as that of the first embodiment.

Since the radio device antenna apparatus according to the fourth embodiment of the present invention is constructed as described above, when the antenna 2 is housed and used, as shown in FIG.
When the antenna 2 is housed in the main body 3, the first impedance matching circuit 1b operates, and impedance matching is performed when the antenna 2 is housed. As a result, good antenna characteristics can be secured even when the antenna is stored and used.

When the antenna 2 is extended and used, the antenna 2 is extended from the main body 3 so that the second impedance matching circuit 1a operates and the antenna 2 extends.
Impedance matching is performed at the time of expansion.
As a result, good antenna characteristics can be secured even when the antenna 2 is extended and used. Thus, in this fourth embodiment, the antenna 2
Impedance matching circuit 1b adjusted when storing
By providing the second impedance matching circuit 1a that is adjusted when the antenna 2 is extended, good impedance characteristics can be obtained regardless of the housed / extended state of the antenna 2.

Further, the first impedance matching circuit 1b for housing the antenna 2 and the second impedance matching circuit 1a for expanding the antenna 2 are also provided without using a switching means such as a switch as in the prior art. Since they can be switched, cost and weight can be reduced. Further, the first impedance matching correction circuit 1a
Alternatively, the second impedance matching correction circuit 1b is connected to the contact means 1
Since it is grounded via the grounding slip ring 11b of 1, the parallel circuit in which the capacitors 10a and 10b are connected in parallel can be used as a matching circuit, and thus fine adjustment of impedance matching can be easily performed. The impedance matching can be surely corrected, and good antenna characteristics can be secured. In a series circuit in which the inductors 9a and 9b and the capacitors 10a and 10b are connected in series, it is difficult to finely adjust the impedance matching.

(E) Others In each of the above embodiments, even if the ground connection is not made or the storage antenna element 5 and the extension antenna element 6 are not electrically disconnected, The present invention can be applied.

[0058]

As described above in detail, according to the radio antenna apparatus of the present invention as set forth in claim 1, in a radio antenna apparatus having an antenna that can be housed in the main body,
The main body is provided with an impedance matching circuit adapted to the extension of the antenna, and the antenna is connected to the impedance matching circuit when the antenna is housed in the main body, thereby cooperating with the impedance matching circuit. The impedance matching correction circuit that constitutes the impedance matching circuit adapted when the antenna is housed is provided, so that the antenna is good both when the antenna is extended and when the antenna is housed, without causing an increase in cost or weight. It is possible to realize excellent impedance matching.

According to a second aspect of the present invention, in addition to the structure of the first aspect, when the antenna is stored in the body, the impedance matching correction circuit is grounded. With such a configuration, the impedance matching can be surely corrected, and good antenna characteristics can be secured. According to the antenna device for a radio device of the present invention described in claim 3, in addition to the configuration described in claim 1 or 2, the antenna includes an antenna element for storage and an antenna for storage. The antenna is configured to include an antenna element for extension when electrically separated from the element, and the impedance matching correction circuit is connected to the antenna element for accommodation, so that the antenna is accommodated when the antenna is accommodated. Even if there is, you can surely correct the impedance matching,
After all, good antenna characteristics can be secured.

According to another aspect of the present invention, there is provided an antenna device for a wireless device, comprising an antenna which can be housed in the main body, wherein the impedance is adjusted to the main body when the antenna is housed. A matching circuit is provided, and the antenna is connected to the impedance matching circuit when the antenna is extended from the body, so that the impedance matching circuit cooperates with the impedance matching circuit when the antenna is extended. With the configuration in which the impedance matching correction circuit that configures the above is provided, good impedance matching can be realized in both the antenna extended state and the antenna retracted state without increasing the cost and the weight.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, when the antenna is extended from the main body, the impedance matching correction circuit is grounded. With such a configuration, the impedance matching can be surely corrected, and good antenna characteristics can be secured. Further, according to the antenna device for a radio device of the present invention according to claim 6, the above-mentioned claim 4
Alternatively, in addition to the configuration according to claim 5, the antenna is configured to include an antenna element for storage and an antenna element for extension when electrically separated from the antenna element for storage, Moreover, the impedance matching correction circuit is connected to the extension antenna element, so that impedance matching can be reliably performed even when the antenna is extended, and good antenna characteristics can be secured.

According to a seventh aspect of the present invention, there is provided an antenna device for a wireless device, comprising an antenna which can be housed in the main body, wherein the antenna is fitted to the antenna when the antenna is housed. 1 impedance matching circuit and the second impedance matching circuit that is matched when the antenna is extended are provided, so that the antenna is good both when the antenna is extended and when the antenna is housed, without causing an increase in cost or weight. It is possible to realize excellent impedance matching.

According to the antenna device for a radio device of the present invention as set forth in claim 8, in addition to the structure of claim 7, the first impedance matching circuit is provided when the antenna is housed in the main body. With the configuration in which the second impedance matching circuit is grounded when the antenna is extended from the main body while being grounded, impedance matching is reliably performed, and good antenna characteristics can be secured.

According to the antenna device for a radio device of the present invention as defined in claim 9, in addition to the configuration as defined in claim 7 or claim 8, the antenna includes a storage antenna element and the storage antenna element. The extension antenna element is electrically separated from the extension antenna element, and the storage impedance antenna element is connected to the first impedance matching circuit and is extended. With the configuration in which the second impedance matching circuit is connected to the time antenna element, impedance matching is surely performed regardless of the state of the antenna, and also good antenna characteristics can be secured.

According to the antenna device for a radio device of the present invention as defined in claim 10, in the antenna device for a radio device having an antenna which can be housed in the main body, the main body is provided with an impedance matching circuit, and A first impedance matching circuit, which is connected to the impedance matching circuit when the antenna is housed in the main body so as to cooperate with the impedance matching circuit to form an impedance matching circuit adapted when the antenna is housed. A second impedance matching circuit, which is connected to the impedance matching circuit when the correction circuit and the antenna are extended from the main body, thereby forming an impedance matching circuit that is matched with the extension circuit when the antenna is extended. The configuration that the correction circuit is provided causes an increase in cost and weight. And without, respectively, in both states when when the antenna is extended and the antenna housing can achieve good impedance matching.

Further, according to the antenna device for a radio device of the present invention as set forth in claim 11, in addition to the structure as set forth in claim 10, the first impedance matching correction circuit is provided when the antenna is housed in the main body. Is grounded, and when the antenna is extended from the main body, the second impedance matching correction circuit is grounded, so that impedance matching can be surely corrected and good antenna characteristics are secured. it can.

Further, according to the antenna device for a radio device of the present invention according to claim 12, the above-mentioned claim 10 or claim 1 is provided.
In addition to the configuration described in 1, the antenna is configured to include an antenna element for storage and an antenna element for extension which is electrically separated from the antenna element for storage, and The first impedance matching correction circuit is connected to the storage antenna element, and the second impedance matching correction circuit is connected to the extension antenna element, so that the impedance matching is surely corrected. Therefore, good antenna characteristics can be secured.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a first principle of the present invention, in which (a) is a diagram showing an antenna housed state and (b) is a diagram showing an antenna extended state.

2A and 2B are diagrams illustrating a second principle of the present invention, in which FIG. 2A is a diagram showing an antenna housed state, and FIG. 2B is a diagram showing an antenna extended state.

3A and 3B are explanatory diagrams of a third principle of the present invention, in which FIG. 3A is a diagram showing an antenna housed state, and FIG. 3B is a diagram showing an antenna extended state.

FIG. 4 is a fourth principle explanatory diagram of the present invention, in which (a) is a diagram showing an antenna housed state and (b) is a diagram showing an antenna extended state.

FIG. 5 is an overall configuration diagram schematically showing the configuration of the first embodiment of the present invention.

FIG. 6 is a diagram schematically showing a circuit configuration of a first embodiment of the present invention.

FIG. 7 is a schematic diagram for explaining the operation of the first embodiment of the present invention.

FIG. 8 is an overall configuration diagram schematically showing a configuration of a second embodiment of the present invention.

FIG. 9 is an overall configuration diagram schematically showing a configuration of a third embodiment of the present invention.

FIG. 10 is an overall configuration diagram schematically showing a configuration of a fourth embodiment of the present invention.

FIG. 11 is a schematic diagram showing an example of a conventional antenna device for a wireless device.

FIG. 12 is a schematic diagram showing another example of a conventional antenna device for a wireless device.

[Explanation of symbols]

 1 Impedance matching circuit 1a 1st impedance matching circuit 1b 2nd impedance matching circuit 2 Antenna 3 Radio body 4a 1st impedance matching correction circuit 4b 2nd impedance matching correction circuit 5 Storage antenna element 6 Extension antenna element 7 RF Circuit 8 Printed circuit board 9, 9a, 9b Inductor 10, 10a, 10b Capacitor (capacitor) 11, 11a, 11b Slip ring 12 Power supply contact metal fitting 13 Ground contact metal fitting 14 Switching means

Claims (12)

[Claims] 1. An antenna (2) which can be housed in a body (3).
In the antenna device for a wireless device, the main body (3) is provided with an impedance matching circuit (1a) adapted when the antenna (2) is extended, and the antenna (2) is provided with the antenna (2). Of the body (3)
The impedance matching circuit (1a) is connected to the impedance matching circuit (1a) when stored in
An antenna device for a wireless device, comprising: an impedance matching correction circuit (4a) that cooperates with the antenna (2) to form an impedance matching circuit when the antenna (2) is housed. 2. The radio device according to claim 1, wherein the impedance matching correction circuit (4a) is configured to be grounded when the antenna (2) is housed in the main body (3). Antenna device. 3. An antenna element (5) for storage, and an antenna element (6) for extension when the antenna (2) is electrically separated from the antenna element (5) for storage. 3. The radio equipment according to claim 1, wherein the impedance matching correction circuit (4a) is connected to the storage antenna element (5). Antenna device. 4. An antenna (2) which can be stored in the main body (3).
In the antenna device for a wireless device, the main body (3) is provided with an impedance matching circuit (1b) adapted to accommodate the antenna (2), and the antenna (2) is provided with the antenna (2). Of the body (3)
Is connected to the impedance matching circuit (1b) at the time of expansion from the impedance matching circuit (1b).
An antenna device for a wireless device, comprising: an impedance matching correction circuit (4b), which cooperates with b) to form an impedance matching circuit adapted when the antenna (2) is extended. 5. The impedance matching correction circuit (4b) is configured to be grounded when the antenna (2) is extended from the body (3).
An antenna device for a wireless device as described. 6. An antenna element (5) for storage, and an antenna element (6) for extension when the antenna (2) is electrically separated from the antenna element (5) for storage. 6. The radio equipment according to claim 4, wherein the impedance matching correction circuit (4b) is connected to the extension antenna element (6). Antenna device. 7. An antenna (2) which can be housed in a body (3).
In the antenna device for a wireless device, the antenna (2) has a first impedance matching circuit (1b) matched when the antenna (2) is housed, and a second impedance matched when the antenna (2) is extended. An antenna device for a wireless device, comprising: a matching circuit (1a). 8. The first impedance matching circuit (1b) is grounded when the antenna (2) is housed in the main body (3), and the antenna (2) extends from the main body (3). Sometimes, the second impedance matching circuit (1a)
8. The antenna device for a wireless device according to claim 7, wherein the antenna device is configured to be grounded. 9. An antenna element (5) for storage, and an antenna element (6) for extension when the antenna (2) is electrically separated from the antenna element (5) for storage. And the first impedance matching circuit (1b) is connected to the storage antenna element (5), and the second impedance matching circuit is connected to the extension antenna element (6). The antenna device for a wireless device according to claim 7 or 8, wherein a circuit (1a) is connected. 10. A radio antenna device comprising an antenna (2) which can be housed in a body (3), wherein the body (3) is provided with an impedance matching circuit (1) and the antenna (2). When the antenna (2) is housed in the main body (3), the antenna (2) is housed in cooperation with the impedance matching circuit (1) by being connected to the impedance matching circuit (1). A first impedance matching correction circuit (4a) that constitutes an impedance matching circuit that is matched with the time, and by connecting to the impedance matching circuit (1) when the antenna (2) is extended from the main body (3), A second impedance matching correction circuit (4b) which cooperates with the impedance matching circuit (1) to form an impedance matching circuit which is matched when the antenna (2) is extended; Characterized in that provided, radio antenna apparatus. 11. The first impedance matching correction circuit (4a) when the antenna (2) is housed in the body (3).
11. The second impedance matching correction circuit (4b) is configured to be grounded when the antenna (2) is extended from the main body (3). Antenna device for wireless. 12. An antenna element (5) for storage, and an antenna element (6) for extension when the antenna (2) is electrically separated from the antenna element (5) for storage. And the first impedance matching correction circuit (4a) is connected to the storage antenna element (5), and the extension antenna element (6) is connected to the second impedance. Matching correction circuit (4b) is connected, The antenna device for wireless devices of Claim 10 or Claim 11 characterized by the above-mentioned.