WO1997015960A1

WO1997015960A1 - Antenna

Info

Publication number: WO1997015960A1
Application number: PCT/JP1996/003060
Authority: WO
Inventors: Masataka Shimabara; Mitsuya Makino
Original assignee: Nippon Antena Kabushiki Kaisha
Priority date: 1995-10-26
Filing date: 1996-10-22
Publication date: 1997-05-01
Also published as: KR987001139A; JPH09130140A; JP2954867B2; CN1169209A; EP0801434A1

Abstract

An antenna (10) is constituted by arranging in line a first antenna element (1) which is a helical antenna and a second antenna element which is a whip antenna. The antenna (10) can be rotated around a rotating shaft (3). When the antenna (10) is vertical, either of the antenna elements is connected to a signal source (7) in its enclosure. For the connection, the antenna (10) is provided with a first contact terminal (5) for the first antenna element and a second contact terminal (6) for the second antenna element which contact terminals on the enclosure side. Matching circuits (4 and 9) which match the antenna elements (1 and 2) of half-wavelength is incorporated in the antenna (10). Therefore, the antenna (10) is small and the impedance adjustment of the antenna (10) is easy.

Description

Description Antenna Technical field

The present invention relates to an antenna that can use any one of two different types of antenna elements, and is particularly suitable for being applied to a portable radio telephone. Background art

Conventionally, as this type of antenna, a type A antenna shown in FIG. 12 (a) described in Japanese Patent Application Laid-Open No. A type B antenna as shown in FIG. 12 (b) as described in Japanese Patent Publication No. 0 (1990), FIG. 12 (c) as described in Japanese Patent Application Laid-Open No. 2-271710 The type C antenna shown in the following is known.

This type A antenna has a whip antenna element 103 that can be slid and housed in a housing 100, and is formed on the whip antenna element 103 at an end via an insulating part 106. It consists of a helical antenna element 104. When the type A antenna is pulled out of the housing 100, the signal source 102 is connected to the whip antenna element 103 via the matching circuit (MC) 101, so that the whip antenna element 103 is set to the operating state. When the type A antenna is housed in the housing 100, the helical antenna element 104 projects from the housing 100, and the helical antenna element 103 is connected to the matching circuit 100. When connected to 1, the helical antenna element 103 is put into an operating state.

The insulating part 106 is composed of a whip antenna element 103 and a helical antenna element. 104 are formed so as not to affect each other. The type B antenna includes a helical antenna element 104 housed in the protrusion of the housing 100 and a whip antenna element 103 that can be slid and housed in the housing 100. Consists of When the type B antenna is pulled out of the housing 100, the signal source 102 is connected to the whip antenna element 103 via the matching circuit (MC) 101, so that the whip antenna element The child 103 is set to the operating state. When the type A antenna is housed in the housing 100, only the helical antenna element 104 is connected to the signal source 102 via the matching circuit 101, so that the helical antenna element 1 03 is set to the operating state.

The insulating portion 106 is formed so that the whip antenna element 103 and the helical antenna element 104 do not affect each other. In addition, the type C antenna has a helical antenna element 104 housed in the protrusion of the housing 100 and a helical whip that can be slid and housed in the housing 100. It consists of antenna element 103. When the type C antenna is pulled out of the housing 100, the signal source 102 is connected to the whip antenna element 103 via the matching circuit (MC) 101. The whip antenna element 103 is brought into an operating state by the capacitive coupling of the element 04. When the type A antenna is housed in the casing 100, the capacitive coupling between the helical antenna element 104 and the whip antenna element 103 is released, and only the helical antenna element 104 is brought into the operating state. You.

The insulating portion 106 is formed so that the whip antenna element 103 and the helical antenna element 104 do not affect each other. In such a conventional antenna, a helical antenna element that is not required at the time of extension and / or an insulating part corresponding to the length of the helical antenna element is present at the tip of the whip antenna element. Is long There is a problem that the storage space becomes large. In addition, when a helical antenna element is formed at the tip, there is a problem that the antenna tip is enlarged.

As described above, the conventional antenna has a problem in reducing the size of the wireless device including the antenna.

In the conventional antenna, the impedance matching between the whip antenna element when the antenna is extended and the helical antenna element when the antenna is stored is performed by a single matching circuit, but the whip antenna element length and the helical antenna There are various combinations of element lengths, and it is not possible to easily adjust the impedance for both antennas, and as shown in Fig. 10, there is a difference in impedance characteristics between both antennas, deteriorating SWR. There was a problem.

Furthermore, when manufacturing the helical antenna element, there were problems that it was difficult to maintain and manage the performance from the coil winding process to the resin molding process, and that the sliding force of the whip antenna element varied.

Therefore, an object of the present invention is to provide an antenna that can be miniaturized, can easily perform impedance adjustment, and can be easily manufactured. Disclosure of the invention

In order to achieve the above object, an antenna according to the present invention includes a first antenna element and a second antenna element, which are arranged in a straight line and have different shapes, and the first antenna element And an antenna having an insertion hole provided between the first antenna element and the second antenna element, the antenna having a through hole provided between the first antenna element and the second antenna element. The power supply means is rotatably supported by the main body, and is connected to any of the antenna elements which have been rotated to stand up to a predetermined position. Further, another antenna of the present invention that achieves the above object includes a first antenna element and a second antenna element, which are arranged in a straight line and have mutually different shapes, and the first antenna An antenna in which the lower ends of the element and the second antenna element are fixed to a rotation axis and integrated with each other, and the rotation axis is pivotally supported through a housing, so that the first antenna element is The second antenna element and the second antenna element are respectively positioned on both surfaces of the housing, and the integrated antenna is rotatably supported by the housing by a rotating shaft pivotally supported by the housing. Then, a feeding means is connected to the first antenna element or the second antenna element which is rotated and stands up to a predetermined position.

Further, in the above two antennas of the present invention, the first antenna element and the second antenna element have different lengths, and the first antenna element is turned up to a predetermined position by rotating the antenna. Alternatively, a switch mechanism for connecting a feeding means to the second antenna element is provided on the rotating shaft,

Further, a matching circuit may be provided at one or both of the feeding points of the first antenna element and the second antenna element,

Furthermore, the first antenna element and the second antenna element may be formed on a plate-shaped dielectric,

Furthermore, the first antenna element is a whip antenna, and the second antenna element is a helical antenna.

According to such an antenna of the present invention, the antenna provided with the two antenna elements is rotatable so that the feeding means is connected to the antenna element standing up at a predetermined position. The size can be reduced. In addition, since a matching circuit can be built in the antenna, matching of each antenna element can be easily performed independently.

Furthermore, the antenna is rotated and housed, and the antenna is mounted on the dielectric plate. If an antenna element is formed, a process such as precise processing and coil winding becomes unnecessary, and therefore, its manufacture can be performed easily. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 (a) is a diagram showing the outline of a first embodiment of the antenna of the present invention, and FIG. 1 (b) is a diagram showing the outline of a second embodiment of the antenna of the present invention; Fig. 1

(c) is a diagram showing an outline of a third embodiment of the antenna of the present invention, and FIG. 1 (d) is a diagram showing an outline of a fourth embodiment of the antenna of the present invention.

FIG. 2 (a) is a diagram showing a configuration when the first antenna element in the antenna of the present invention is used, and FIG. 2 (b) is a diagram using the second antenna element in the antenna of the present invention. It is a figure showing a mode at the time.

FIG. 3 (a) is a front view showing a detailed configuration of a fourth embodiment of the antenna of the present invention, and FIG. 3 (b) is a detailed configuration of a fourth embodiment of the antenna of the present invention. FIG.

FIG. 4 (a) is a front view showing a detailed configuration of a third embodiment of the antenna of the present invention, and FIG. 4 (b) is a detailed configuration of the third embodiment of the antenna of the present invention. FIG.

FIG. 5 (a) is a front view showing a detailed configuration of a second embodiment of the antenna of the present invention, and FIG. 5 (b) is a detailed configuration of the second embodiment of the antenna of the present invention. FIG.

FIG. 6 (a) is a front view showing the detailed configuration of the first embodiment of the antenna of the present invention, and FIG. 6 (b) is the detailed configuration of the first embodiment of the antenna of the present invention. FIG.

FIG. 7 is a diagram showing a configuration of a switch mechanism provided on a rotating shaft in the antenna of the present invention.

FIG. 8 (a) is a table of a housing provided with a modification of the antenna according to the fifth embodiment of the present invention. FIG. 8 (b) is a perspective view showing a configuration on the back side of a housing provided with a modification of the antenna according to the fifth embodiment of the present invention.

FIG. 9 (a) is a cross-sectional view showing a configuration of a modification of the fifth embodiment of the antenna of the present invention, and FIG. 9 (b) is a cross-sectional view of a modification of the fifth embodiment of the antenna of the present invention. FIG. 9 is a cross-sectional view illustrating a configuration of an antenna case accommodating a second antenna, and FIG. 9 (c) illustrates an antenna case accommodating a first antenna according to a modification of the fifth embodiment of the antenna of the present invention. FIG. 2 is a cross-sectional view illustrating a configuration of an antenna case in which the present invention is applied.

FIG. 10 is a diagram showing impedance characteristics of the antenna of the present invention.

FIG. 11 is a diagram showing impedance characteristics of a conventional antenna.

FIG. 12 (a) is a diagram showing a schematic configuration of type A in a conventional antenna, and FIG. 12 (b) is a diagram showing a schematic configuration of type B in a conventional antenna. Figure (c) is a diagram showing a schematic configuration of type C in a conventional antenna. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows a schematic configuration of the antenna of the present invention. FIG. 1 (a) shows the configuration of the first embodiment of the antenna of the present invention, and FIG. 1 (b) shows the configuration of the second embodiment of the antenna of the present invention. FIG. 13C shows the configuration of the third embodiment of the antenna of the present invention, and FIG. 14D shows the configuration of the fourth embodiment of the antenna of the present invention.

The antenna 10 of the first embodiment shown in FIG. 1 (a) is composed of a second antenna element 2 serving as a whip antenna and a first antenna element 1 serving as a helical antenna arranged in a straight line. The rotation axis 3 is provided between the first antenna element 1 and the second antenna element 2. The insertion hole formed in the antenna 10 is fitted to the rotating shaft 3, and the antenna 10 is rotatably supported with respect to the rotating shaft 3. The rotating shaft 3 is provided on a housing of a portable radio telephone (not shown). ing.

In addition, since the electrical length of the second antenna element 2 is set to about 12 wavelengths Z 2) and the antenna impedance is increased, a matching circuit (MC) 9 is provided for impedance matching with the housing side. Built in antenna 10. The matching circuit 9 is provided between the second antenna element 2 and the second contact terminal 6. When the signal source 7 provided in the housing is connected to the second contact terminal 6 via the housing-side contact terminal as shown in the figure, the signal of the signal source 7 is supplied to the second antenna element 2. When the antenna 10 is rotated and the first antenna element 1 is raised so that the first antenna element 1 faces upward, the signal source 7 is connected to the first contact terminal 5 via the housing-side contact terminal. As a result, the first antenna element 1 enters an operating state. For this purpose, a first contact terminal 5 for the first antenna element 1 and a second contact terminal 6 for the second antenna element 2 are formed on the antenna 10.

Note that the electrical length of the first antenna element 1 is about 4.

The antenna according to the first embodiment is configured as described above. When the antenna 10 is rotated and erected, the rotation axis is set so that the signal source 7 is connected to one of the antenna elements located above. 3 is provided with a switch mechanism described later.

An antenna 10 according to the second embodiment shown in FIG. 1 (b) has a second antenna element 2 serving as a whip antenna and a first antenna element 1 serving as a helical antenna arranged in a straight line. The rotation axis 3 is provided between the first antenna element 1 and the second antenna element 2. The insertion hole in which the antenna 10 is formed is fitted to the rotating shaft 3, and the antenna 10 is rotatably supported with respect to the rotating shaft 3. Note that the rotating shaft 3 is provided on a casing of a portable wireless telephone or the like (not shown).

Also, since the electrical length of the first antenna element 1 and the second antenna element 2 is set to about one-two wavelengths (λΖ2) and the antenna impedance is increased, impedance matching with the housing side is performed. In order for the matching circuit (MC) 8 to be Is provided. The matching circuit 8 is provided between the signal source and the unit on the housing side that comes into contact with the antenna 10.

When the signal source 7 provided in the housing is connected to the second contact terminal 6 via the matching circuit 8 and the housing-side contact terminal as shown in the figure, a signal is sent to the second antenna element 2. When the signal from the source 7 is supplied and the antenna 10 is turned on, the antenna 10 is rotated and the first antenna element 1 is raised so that the first antenna element 1 is on the upper side. The first antenna element 1 is connected to the first contact terminal 5 and is in the operating state. For this purpose, a first contact terminal 5 for the first antenna element 1 and a second contact terminal 6 for the second antenna element 2 are formed on the antenna 10. In the second example, the electrical lengths of the first antenna element 1 and the second antenna element 2 are both set to about λΖ2 as compared with the first embodiment. The antenna 10 of the third embodiment shown in FIG. 1 (c) is composed of a second antenna element 2 serving as a whip antenna and a first antenna element 1 serving as a helical antenna arranged in a straight line. The rotation axis 3 is provided between the first antenna element 1 and the second antenna element 2. The insertion hole in which the antenna 10 is formed is fitted to the rotating shaft 3, and the antenna 10 is rotatably supported with respect to the rotating shaft 3. Note that the rotating shaft 3 is provided on a casing of a portable wireless telephone or the like (not shown).

The electrical length of the first antenna element 1 and the second antenna element 2 is about 12 wavelengths (Α Ζ 2), and the antenna impedance is high. In addition, matching circuits (MC) 4 and 9 are built into antenna 10. The matching circuit 9 is provided between the second antenna element 2 and the second contact terminal 6, and the matching circuit 4 is provided between the first antenna element 1 and the first contact terminal 5. I have.

When the signal source 7 provided in the housing is connected to the second contact terminal 6 via the housing-side contact terminal as shown, the signal of the signal source 7 is transmitted to the second antenna element 2. When the antenna 10 is rotated and the first antenna element 1 is turned up so that the first antenna element 1 is turned up, the signal source 7 is connected to the first contact terminal via the housing-side contact terminal. 5 and the first antenna element 1 is activated. For this purpose, a first contact terminal 5 for the first antenna element 1 and a second contact terminal 6 for the second antenna element 2 are formed on the antenna 10.

The third embodiment is configured as described above, and is different from the second embodiment only in the way of providing a matching circuit.

The antenna 10 of the fourth embodiment shown in FIG. 1 (d) has a second antenna element 2 serving as a whip antenna and a first antenna element 1 serving as a helical antenna arranged in a straight line. The rotation axis 3 is provided between the second antenna element 2 and the first antenna element 1. The insertion hole in which the antenna 10 is formed is fitted to the rotating shaft 3, and the antenna 10 is rotatably supported with respect to the rotating shaft 3. Note that the rotating shaft 3 is provided on a casing of a portable wireless telephone or the like (not shown).

Also, the electrical length of the first antenna element 1 and the second antenna element 2 is about 1/4 wavelength (λ Ζ 4), and the impedance matching with the housing side can be performed without a matching circuit. Has been taken.

When the signal source 7 provided in the housing is connected to the second contact terminal 6 via the housing-side contact terminal as shown in the figure, the signal of the signal source 7 is supplied to the second antenna element 2. When the antenna 10 is rotated and the first antenna element 1 is raised so that the first antenna element 1 faces upward, the signal source 7 is connected to the first contact terminal 5 via the housing-side contact terminal. As a result, the first antenna element 1 enters an operating state. For this purpose, a first contact terminal 5 for the first antenna element 1 and a second contact terminal 6 for the second antenna element 2 are formed on the antenna 10.

In the fourth embodiment, the electrical length of the first antenna element 1 and the second antenna element 2 is set to about λΖ4. Next, FIG. 2 shows an example of the configuration of a housing of a portable radio telephone or the like provided with any of the embodiments of the antenna 10 of the present invention.

As shown in this figure, the antenna 10 is composed of a thin plate, and is mounted on the housing 11 so that it can rotate about the rotation axis 3. The housing on which the antenna 10 is mounted is mounted. On the mounting surface of the body 11, a recess 12 is formed in which the antenna 10 is housed upright and the first antenna element 1 is rotatable. FIG. 2 (a) shows the upright state of the antenna 10 when the housing 11 is connected to the first antenna element 1, and the first antenna element 1 projects from the housing 11 Antenna 10 is standing upright. At this time, the second antenna element 2 is housed in the concave portion 12 so as not to protrude from the surface of the housing 11.

From this state, when the antenna 10 is rotated and the second antenna element 2 is erected so as to protrude from the housing 11 as shown in FIG. The housing 11 is now connected. At this time, the first antenna element 1 is separated from the housing 11 side.

By rotating and standing the antenna 10 in this manner, switching between the first antenna element 1 and the second antenna element 2 can be performed.

Next, FIG. 3 shows a detailed configuration of a fourth embodiment of the antenna of the present invention shown in FIG. 1 (d). Fig. 3 (a) shows a front view, and Fig. 3 (b) shows a side view. As shown in this figure, a first antenna element 1 formed as a helical antenna formed in a coil shape and a second antenna element 2 formed as a whip antenna formed in a linear shape are cylindrical or The antenna 10 is housed in a rectangular resin antenna case 20 so as to be substantially linear. The electrical lengths of the first antenna element 1 and the second antenna element 2 are both about λ 約 4.

The antenna 10 is rotatably mounted on one surface of the housing 11 by a rotating shaft 3. The antenna case 20 is provided with a first contact terminal 5 to which the first antenna element 1 is connected and a second contact terminal 6 to which the second antenna element 2 is connected. ing. The first contact terminal 5 and the second contact terminal 6 are arranged at positions facing the housing-side contact terminals 13 provided on the housing 11, and the antenna 10 is turned upright when the antenna 10 is rotated. In some cases, the contact terminal on one of the antenna elements protruding from the housing 11 comes into contact with the housing-side contact terminal 13. As shown, when the first antenna element 1 stands up so as to protrude from the housing 11, the first contact terminal 5 comes into contact with the housing-side contact terminal 13, and the first The antenna element 1 is connected to the circuit 14 in the housing. Also, when the antenna 10 is rotated by 180 ° to stand up so that the second antenna element 2 protrudes from the housing 11, the second contact terminal 6 comes into contact with the housing-side contact terminal 13. As a result, the second antenna element 2 is connected to the internal circuit 14. Next, FIG. 4 shows a detailed configuration of a third embodiment of the antenna of the present invention shown in FIG. 1 (c). Fig. 4 (a) shows a front view, and Fig. 4 (b) shows a side view. The antenna of the third embodiment shown in this figure has an electrical length of about λ の of the first antenna element 1 and the second antenna element 2 compared to the antenna of the fourth embodiment shown in FIG. 2, and only the configuration based on this difference will be described below.

A first antenna element matching circuit 4 is formed between the first antenna element 1 which is a helical antenna and a part of the housing 1 which is in contact with the rotating shaft 3 which is in contact with the ground, and a whip antenna A second antenna element matching circuit 9 is formed between the second antenna element 2 and the portion of the housing 1 that is in contact with the ground 3 The antenna 10 is housed in 20.

The antenna 10 is rotatably mounted on one surface of the housing 11 by a rotating shaft 3, and the first antenna element matching circuit 4 is connected to the antenna case 20. The first contact terminal 5 and the second contact terminal 6 to which the second antenna element matching circuit 9 is connected are provided. The first contact terminal 5 and the second contact terminal 6 are arranged at positions facing the housing-side contact terminals 13 provided on the housing 11, and the antenna 10 is rotated to stand up. In this case, the contact terminals 5 and 6 on one of the antenna elements, which stand up so as to protrude from the housing 11, come into contact with the housing-side contact terminal 13.

The first antenna element matching circuit 4 and the second antenna element matching circuit 9 are provided on a print substrate.

As shown, when the first antenna element 1 stands up so as to protrude from the housing 11, the first contact terminal 5 comes into contact with the housing-side contact terminal 13, and the first The antenna element 1 is connected to the circuit 14 in the housing via the first antenna element matching circuit 4. When the antenna 10 is rotated by 180 ° and the second antenna element 2 stands up so as to protrude from the housing 11, the second contact terminal 6 comes into contact with the housing-side contact terminal 13. Thus, the second antenna element 2 is connected to the circuit 14 inside the housing via the second antenna element matching circuit 9. Next, FIG. 5 shows a detailed configuration of a second embodiment of the antenna of the present invention shown in FIG. 1 (b). Fig. 5 (a) shows the front view, and Fig. 5 (b) shows the side view. In the antenna of the second embodiment shown in this figure, a first antenna element 1 serving as a helical antenna and a second antenna 2 serving as a sleeve antenna are housed in a resin antenna case 20. An antenna 10 is configured. The rotating shaft is a coaxial rotating shaft 21, the outer conductor of the coaxial rotating shaft 21 is connected to the ground on the housing 11 side, and the center conductor is arranged in the housing 11. Connected to the matching circuit 8.

The outer conductor of the coaxial rotary shaft 21 is connected to the sleeve of the second antenna 2 serving as a sleeve antenna, and a switch mechanism is configured using the center conductor of the coaxial rotary shaft 21. Have been. The details of this switch mechanism are shown in FIG. 7. The tip of the cylindrical housing-side power supply terminal 13 constituting the center conductor of the coaxial rotary shaft 21 is cut in half to form a semicircle. In the illustrated case, the arc-shaped first contact terminal 5 connected to the first antenna element 1 is brought into contact with the semicircular casing-side power supply terminal 13, and The signal source 7 is connected to the first antenna element 1.

The antenna 10 is rotatably mounted on one surface of the housing 11 by a rotating shaft 3, and the antenna 10 is rotated by 180 ° so that the second antenna element 2 protrudes from the housing 11. When it stands up, the arc-shaped second contact terminal 6 comes into contact with the housing-side feed terminal 13, and the second antenna element 2 is connected to the signal source 7 through the second antenna element matching circuit 9. Be connected.

By rotating the antenna 10 on the coaxial rotating shaft 21 in this way, the first antenna element 1 and the second antenna element 2 are automatically switched and connected to the circuit in the housing 11 A switch mechanism is provided.

In the example shown in FIG. 5, a matching circuit 8 is provided between the housing side power supply terminal 13 and the circuit 14 inside the housing.

Next, FIG. 6 shows a fifth embodiment of the antenna of the present invention.

The antenna of the fifth embodiment shown in this figure has a first antenna element 1 formed zigzag on a dielectric plate 22 and a second antenna formed linearly on a dielectric plate 22. The antenna element 2 is housed in an elongated planar resin antenna case 20.

The electrical lengths of the first antenna element 1 and the second antenna element 2 are both about λΖ2, and the antenna 10 can be a thin plate-shaped flexible antenna.

The antenna 10 is rotatably mounted on one surface of the housing 11 by a rotation shaft 3. The antenna case 20 includes a first contact terminal 5 to which the first antenna element 1 is connected and a first contact terminal 5. Second contact terminal 6 to which second antenna element 2 is connected Are provided. The first contact terminal 5 and the second contact terminal 6 are arranged at positions facing the arc-shaped housing-side contact terminals 13 provided on the housing 11, and the antenna 10 is rotated. When standing up, one of the antenna element-side contact terminals protruding from the housing 11 comes into contact with the housing-side contact terminal 13.

Further, a panel 15 is provided between the housing-side contact terminal 13 and the terminal 16, and is urged by the panel 15 so that the housing-side contact terminal 13 is provided in the antenna case 20. The contact terminals 5 and 6 are in stable contact.

As shown, when the first antenna element 1 stands up so as to protrude from the housing 11, the first contact terminal 5 comes into contact with the housing-side contact terminal 13, and the first The antenna element 1 is connected to the circuit 14 in the housing. When the antenna 10 is rotated by 180 ° and the second antenna element 2 stands up so as to protrude from the housing 11, the second contact terminal 6 contacts the housing-side contact terminal 13. As a result, the second antenna element 2 is connected to the internal circuit 14.

The signal from the antenna 10 guided into the housing 11 is supplied to the internal circuit 14 via the matching circuit 8.

Next, a modification of the fifth embodiment of the antenna of the present invention is shown in FIGS.

The antenna of the modified example of the fifth embodiment shown in this figure has a first antenna element 1 disposed on one surface of a housing 11 as shown in FIG. Antenna element 2 is arranged. That is, the first antenna element 1 and the second antenna element 2 sandwich the housing 11, and the first antenna element 1 and the second antenna element 2 It is integrated by being fixed. Although not shown, a fan-shaped concave portion is formed on one surface on which the first antenna element 1 is arranged, as shown in FIG. 2, so that the first antenna element 1 can rotate. On the other side where antenna element 2 is located, the second antenna element A recess 12 for accommodating 2 is provided.

Here, as shown in FIG. 8 (a), when the first antenna element 1 which is in the operating state protruding upward from the housing 11 is rotated, the second antenna connected by the rotating shaft 3 is rotated. The element 2 also rotates, and when rotated by 180 °, the second antenna element 2 projects from the housing 11 as shown in FIG. 4B, and the second antenna element 2 It operates instead of antenna element 1.

The detailed configuration of such an antenna is shown in FIG. 9, in which a first antenna element 1 formed in a zigzag shape on a dielectric plate 22 is housed in an elongated planar resin case 20 made of resin. The second antenna element 2, which is housed and formed linearly on the dielectric plate 22 ', is also housed in an elongated flat resin antenna case 20'.

As shown in FIG. 8, the antenna 10 has a configuration in which a first antenna element 1 is disposed on one surface of a housing 11 and a second antenna element 2 is disposed on the other surface. Element 1 and second antenna element 2 are fixed to rotating shaft 3 and integrated. The rotating shaft 3 penetrates from the front surface to the back surface of the housing 11, and the rotating shaft 3 is rotatably supported by the housing 11.

Also, the antenna case 20 is provided with a first contact terminal 5 to which the first antenna element 1 is connected as shown in FIG. 9 (a), and the antenna case 20 'is provided with a second contact terminal 5. The second contact terminal 6 to which the antenna element 2 is connected is provided as shown in FIG. 9 (b).

The first contact terminal 5 is disposed at a position facing the arc-shaped casing-side contact terminal 13 provided on the casing 11, and when the antenna 10 is rotated and erected, Make sure that the contact terminal 5 of the first antenna element 1 contacts the housing side contact terminal 13 The second contact terminal 6 is disposed at a position opposite to the arc-shaped casing-side contact terminal 13 ′ provided on the casing 11, and when the antenna 10 is turned upright when the antenna 10 is rotated. Then, the contact terminal 6 of the second antenna element 2 comes into contact with the housing-side contact terminal 13 '.

The housing-side contact terminals 13 and 13 ′ are urged to protrude by the panels 15 and 15 ′, so that the housing-side contact terminals 13 and 13 ′ become the antenna case 20. The contact terminals 5 and 6 provided at 20 'are securely contacted with each other.

Since the antenna 10 is configured as described above, if the first antenna element 1 stands up so as to protrude from the housing 11, the first contact terminal 5 becomes the housing-side contact terminal 1. As a result, the first antenna element 1 comes into contact with the circuit 14 in the housing via the matching circuit 8.

Further, when the antenna 10 is rotated by 180 ° and the second antenna element 2 stands up so as to protrude from the housing 11, the second contact terminal 6 comes into contact with the housing-side contact terminal 13 ′. Then, the second antenna element 2 is connected to the circuit 14 in the housing via the matching circuit 8. In this case, since the first antenna element 1 also rotates at the same time, the contact between the first contact terminal 5 and the housing-side contact terminal 13 is cut off, and the first antenna element 1 is housed in the recess. Become like

Although the antenna 10 of this modification has been described as a modification of the fifth embodiment, the arrangement of the antenna elements on both surfaces of the housing 11 is different from that of the fifth embodiment. The present invention can be applied to not only the antenna but also the first to fourth antennas.

As described above, the antenna 10 according to the first to fifth embodiments of the present invention has the first antenna element 1 and the second antenna element 2, and the electric power of each antenna element A single matching circuit or a common matching circuit is provided in the antenna 10 or the housing 11 according to the length, so that each antenna element is connected to the circuit in the housing. The impedance matching can be adjusted well.

The impedance characteristics of each antenna element of the antenna 10 according to the present invention are shown in Fig. 11, and at the operating frequency indicated by ▽, the SWR of each antenna element is set to almost 1, which indicates good antenna characteristics. . In the conventional antenna, since impedance adjustment cannot be performed for each antenna element, as shown in FIG. 10, the SWR of each antenna element at the operating frequency indicated by ▽ has deteriorated as shown in FIG.

As described above, the antenna of the present invention is not intended to be simply rotatable and housed, but is premised on that one of the two antenna elements is always in an operating state. .

The configuration of the power supply means for connecting the antenna 10 and the housing 11 shown in FIGS. 5 (FIG. 7) and FIG. 6 is not limited to the embodiment shown in each figure. It is natural that the present invention can be applied to the embodiment.

Further, in each embodiment, each antenna element can use an antenna element of various shapes. Industrial applicability

As described above, according to the present invention, the antenna including the two antenna elements is rotatable, and the feeding means is connected to the antenna element standing at a predetermined position. Therefore, the size of the main body including the antenna can be reduced. Therefore, it is suitable for application to portable devices, especially portable radio telephones.

In addition, since a matching circuit can be incorporated in the antenna, matching of each antenna element can be easily performed, and characteristics of each antenna element can be improved.

Furthermore, the antenna is rotated and housed, and the antenna is placed on the dielectric. When the tener element is formed, a plate-shaped flexible antenna can be obtained, and the size can be reduced. Furthermore, since the steps of precise processing and coil winding are not required, the manufacturing thereof can be performed easily.

Claims

The scope of the claims

1. A first antenna element and a second antenna element, which are arranged in a straight line and have different shapes, are provided between the first antenna element and the second antenna element. An antenna having a through hole, wherein the first antenna element and the second antenna element are rotatably supported by a housing by a rotation shaft pivotally supported by the through hole, and are rotated and fixed. A feeding means is connected to any one of the antenna elements standing up to the position.

2. The first antenna element or the second antenna element in which the first antenna element and the second antenna element have different lengths, and the antenna is rotated to stand up to a predetermined position. 2. The antenna according to claim 1, wherein a switch mechanism for connecting a power supply means is provided on said rotary shaft.

3. The antenna according to claim 1, wherein a matching circuit is provided at one or both of feed points of the first antenna element and the second antenna element.

4. The antenna according to claim 1, wherein the first antenna element and the second antenna element are formed on a plate-shaped dielectric.

5. The antenna according to claim 1, wherein the first antenna element is a whip antenna, and the second antenna element is a helical antenna.

6. A first antenna element and a second antenna element, which are arranged in a linear shape and have different shapes from each other, and the lower ends of the first antenna element and the second antenna element serve as rotation axes. A fixed and integrated antenna, wherein the first antenna element is formed by pivotally supporting the rotation axis through a housing. And the second antenna element are positioned on both sides of the housing, respectively.

The integrated antenna is rotatably supported by the housing by a rotating shaft pivotally supported by the housing, and the first antenna element or the second antenna that is rotated and stands up to a predetermined position. An antenna characterized in that feeding means is connected to the antenna element.

7. The first antenna element or the second antenna element in which the first antenna element and the second antenna element have different lengths, and the antenna is rotated to stand up to a predetermined position. 7. The antenna according to claim 6, wherein a switch mechanism for connecting a power supply unit is provided on the rotating shaft.

8. The antenna according to claim 6, wherein a matching circuit is provided at one or both of the feeding points of the first antenna element and the second antenna element.

9. The antenna according to claim 6, wherein the first antenna element and the second antenna element are formed on a plate-shaped dielectric.

10. The antenna according to claim 6, wherein the first antenna element is a whip antenna, and the second antenna element is a helical antenna.