JPH07235820A - Antenna - Google Patents

Abstract

PURPOSE:To provide the antenna with simple configuration in which no improper contact takes place. CONSTITUTION:An antenna conductor 18, a tip of a tube 17 coated with the antenna conductor 18 and a coupling bar 14 are formed integrally to form a joint 15, a helical antenna 12 is connected to the coupling bar 14 and an insulating stopper 21 is provided to the other end of the antenna conductor 18. When the antenna is extended, the stopper 21 is contained in a conductive holder 19 to couple the antenna conductor 18 and the holder 19 in terms of capacity and when the antenna is contained, the joint 15 is supported by the holder 19 to couple the coupling bar 14 and the holder 19 in terms of capacity.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Recently, portable telephones have become popular.
This mobile phone is provided with an antenna for transmitting and receiving radio waves for a call. This antenna is a telescopic antenna that can be housed in the housing of a mobile phone for convenient carrying. However, when the antenna is stored in the housing, the mobile phone becomes almost impossible to transmit and receive. Therefore, by storing the helical antenna part on the top of the antenna, this helical antenna part is used when storing the antenna. By making the antenna and the helical antenna part project from the case at all times, the whip antenna expands and contracts in the helical antenna part, and the helical antenna part is used when storing. , Making calls possible.

An antenna used in such a portable radio device is conventionally known as described in, for example, Japanese Patent Application Laid-Open No. 3-245603 or Japanese Patent Application Laid-Open No. 2-2717101. An example is shown in FIGS.
Shown in. In FIG. 5, reference numeral 100 denotes a housing of a portable wireless device, and a holder 101 is fixed to the housing 100, so that an antenna 120 is fixed to the housing 100 in a stretchable manner. The antenna 120 is composed of a whip antenna section 120-2 and a helical antenna section 120-1, and a stopper section 127 is provided at the lower end thereof. Further, the helical antenna part 120-1 is housed in the antenna top 121 at the tip of the whip antenna part 120-2, and the whip antenna part 120-2 is extended from the housing 100 in FIG. The closed state is shown. The whip antenna unit 120-2 is 1/4
Wavelength, and in this case, of course,
The operator is talking using the whip antenna unit 120-2.

Further, FIG. 1B shows a state in which the whip antenna section 120-2 is housed in the housing 100. In this case, the whip antenna section 120-2 is installed in the top 121 from the housing 100. The helical antenna section 120-1 is protruding. This helical antenna section 120-1 is 1/4
The wavelength is set, and the operator generally holds the portable wireless device in such a state. In this case, the helical antenna section 120-1 housed in the antenna top 121 is used. Therefore, it is possible to send and receive.

Next, the structure of the antenna 120 is shown in FIG. In this figure, the whip antenna section 120-2
The antenna core wire 126 is covered with a non-conductive tubular body 125, and the tubular body 125 is press-fitted into one end of the fastener 124, and the helical antenna portion 120-1 is attached to the other end of the fastener 124. The metal fitting 123 connected to the loading coil 122 that constitutes the above is fixed. At this time, the antenna core wire 126 is connected to the metal fitting 123. Further, the helical antenna section 120-1 is housed in a synthetic resin cylindrical body forming the top 121. Further, a stopper 127 is provided at the lower end of the whip antenna 120-2, and the stopper 127 and the antenna core wire 126 are connected at an end 128.

Since the antenna 120 is constructed in this way, as shown in FIG.
When the antenna 120 is extended, the stopper portion 127 and the holder 101 are electrically connected to each other, and when the antenna 120 is housed, the stopper 124 is attached to the holder 101 as shown in FIG. 5B.
Will be electrically connected to. Further, the antenna 200 shown in FIG. 7 is composed of a whip antenna section 201 and a helical antenna section 206. When the whip antenna section 201 is extended from the housing 210 as shown in the drawing, The helical antenna unit 206 is capacitively coupled. The whip antenna portion 201 is formed by molding a conductor wound in a coil shape, and an insulating portion where no coil is provided is formed at the upper end portion and the lower end portion thereof.

Further, the helical antenna portion 206 is provided in the antenna housing 204 provided on the upper surface of the housing 210.
Is arranged, and the core wire of the coaxial cable 208 is connected to the lower end of the helical antenna section 206. The helical antenna portion 206 is configured to be wound around a tubular body 205, and the whip antenna portion 201 is slidably accommodated in the tubular body 205. The shield wire of the coaxial cable 208 is connected to the ground portion 207, and the ground portion 207 is housed in the upper part of the housing 210. The whip antenna unit 201 is 1 /
It has two wavelengths, and the helical antenna unit 206 has 1 /
It has four wavelengths.

Since the antenna 200 is constructed in this way, when the whip antenna section 201 is extended, the whip antenna section 201 capacitively coupled to the helical antenna section 206 operates and the whip antenna section 201 operates. When the antenna is stored, the helical antenna unit 206
Will work. Further, when the antenna 200 is housed, the insulating portion formed at the upper end of the whip antenna unit 201 is located inside the helical antenna unit 206, so that the helical antenna unit 206 and the whip antenna unit 201 may be coupled to each other. There is no.

[0009]

However, in the antenna shown in FIGS. 5 and 6, the holder and the whip antenna portion or the helical antenna portion are connected by contact, and therefore, if the extension and contraction are repeatedly used for a long period of time, contact failure occurs. There is a risk that In particular, since the mobile phone is often used outdoors, there is a problem that it is easily affected by dust or the like and a contact failure easily occurs. Further, when this antenna is extended, it becomes a half-wavelength antenna, and when it is accommodated, it becomes a quarter-wavelength antenna, so that the antenna impedance thereof greatly differs between when it is extended and when it is accommodated. Therefore, there is also a problem that it is difficult to match the antenna and the power feeding unit that feeds the antenna between the time of extension and the time of storage.

Further, the antenna shown in FIG. 7 has a problem that a ground portion is required and a space for housing the ground portion is required in the housing. In addition, since the ground portion is less likely to be affected by the operator, it has to be arranged in the upper part of the housing, which causes a problem that the configuration of the antenna becomes complicated. Furthermore, in recent mobile phone technology, the goal is to be smaller and lighter, which makes it difficult to secure a storage space for the telescopic antenna element, and the transmission / reception frequency at the operating frequency becomes wider. Therefore, it is necessary to shorten the antenna element and widen the band.
Therefore, the present invention can achieve downsizing and wide band,
It is an object of the present invention to provide an antenna that has a simple structure and is less likely to cause poor contact.

[0011]

In order to solve the above-mentioned problems, an antenna of the present invention is fixed to a casing of a radio device and has a conductive holder provided with an insulating means in an insertion hole, and an antenna. The whip antenna part is made of a conductor and a flexible tube having the antenna conductor inserted except the tip part, and is slidable in the holder, and one end is fixed to the tip part of the flexible tube. And a conductive stopper that is provided on the other end of the flexible tube and is connected to the antenna conductor, and is housed in the top. A helical antenna portion connected to the other end of the sleeve, the sleeve and the antenna conductor are insulated, and the sleeve is slidably held by the holder. More and said sleeve and said holder capacitively coupled, by the stopper is slid held by the holder, in which as the above stopper and the holder are capacitively coupled.

The antenna of the present invention comprises a conductive holder fixed to the radio housing and an antenna conductor covered with a flexible tube, and slidably inserted into the holder. A whip antenna portion, a top provided at one end of the whip antenna via an insulating joint portion, and an insulating stopper provided at the other end of the whip antenna, and the whip antenna portion is housed in the top. Along with the helical antenna part connected to the coupling bar insert-molded in the joint part,
The antenna conductor and the coupling bar are formed separately in the joint portion, and when the joint portion or the stopper is slidably held by the holder,
The joint portion or the stopper and the holder are capacitively coupled.

Further, the antenna of the present invention comprises a conductive holder fixed to the radio housing, an antenna conductor,
A whip antenna part which is made of a flexible tube in which the antenna conductor is inserted except the tip part and which is slidable in the holder, and a conductive part having one end fixed to the tip part of the flexible tube. Top provided via a flexible sleeve, an insulating stopper provided at the other end of the flexible tube, and housed in the top and connected to the other end of the sleeve A helical antenna portion is provided, the sleeve and the antenna conductor are insulated, and the sleeve is slidably held in the insertion hole of the holder, whereby the sleeve and the holder are directly electrically connected. The stopper is slidably held in the insertion hole of the holder to capacitively couple the whip antenna portion and the holder. . Furthermore, in the antenna of the present invention, a coil bobbin around which a coil forming the helical antenna section is wound may be fitted in the top, or the joint section may be made of a high-strength insulating material. It may be formed.

[0014]

According to the present invention, since the conductive holder and the whip antenna portion or the helical antenna portion are capacitively coupled to each other, the possibility of contact failure can be prevented. Further, the capacitance component enables the antenna to be downsized, and at the same time, the ultra wideband performance can be obtained in the frequency characteristic of the antenna input impedance. Further, since the structure is simple and the antenna can be easily manufactured, the antenna can be provided at low cost.

[0015]

FIG. 1 shows a first embodiment of the antenna of the present invention. In this figure, a part of the whip antenna section 6 and the holder 9 are shown in cross section. The antenna is composed of a whip antenna 6 and a helical antenna section 2. The whip antenna section 6 is composed of an antenna conductor 8 covered with a flexible tube 7 having elasticity. A conductive sleeve 4 is fixed to one end of the whip antenna section 6, and the helical antenna section 2 housed in the top 1 is connected to the sleeve 4. In addition, the tip of the tube 7 has an antenna conductor 8 so that the antenna conductor and the sleeve 4 are not coupled.
Is an insulating portion 5 that is stored only halfway, and the sleeve 4 is fixed to the insulating portion 5.

As the antenna conductor 8 of the whip antenna section 6, a superelastic metal made of, for example, nickel-titanium alloy is used. Further, polyacetal, which is a synthetic resin having elasticity, is used as the material for the tube 7, and polyester elastomer, for example, is used as the synthetic resin material for the antenna top 1.

Further, the hole of the tube 7 in the insulating portion 5 is closed with an insulating material or an adhesive. The other end of the antenna conductor 8 is fixed to a conductive stopper 10 to be electrically connected. Further, a holder 9 that slidably holds the sleeve 4 and the stopper 10 is inserted into the whip antenna section 6. Further, the helical antenna unit 2 is constructed by winding a coil around a bobbin 3 provided in the top 1, and the end of this coil is connected to the sleeve 4.
Further, a synthetic resin is molded in order to protect the coil, and the helical antenna portion 2 having a function as the antenna top 1 is configured. The holder 9 is composed of a conductive outer conductor 9-1 of the holder and an insulating cylinder 9-2 provided in the insertion hole of the outer conductor 9-1 of the holder.

In the antenna thus constructed,
When the antenna is extended, the holder 9 is fixed to the housing or the like.
Since the stopper 10 is inserted and held from below, and the stopper 10 faces the holder 9 via the insulating cylinder 9-2, the stopper 10 is capacitively coupled to the holder 9. Therefore, the whip antenna section 6 is capacitively connected to the holder 9. Further, when the antenna is housed, the sleeve 4 is inserted and held in the holder 9 from above, and the sleeve 4 faces the holder 9 via the insulating cylinder 9-2, so that the sleeve 4 is capacitively coupled to the holder 9. Like Therefore, the helical antenna unit 2 is capacitively coupled to the holder 9.

The reason for providing the insulating part 5 will be explained. As described above, in the antenna shown in FIG. 1, the whip antenna part 6 and the helical antenna part 2 are used independently as antennas. There is. Therefore, the sleeve 4 that is the power feeding portion of the helical antenna portion 2
When a capacitance is generated between the antenna conductor 8 and the antenna conductor 8 in the whip antenna section 6, the helical antenna section 2 and the whip antenna section 6 are electrically coupled to each other so that the operation of each antenna is adversely affected. become. In order to prevent this, a sufficient distance between the helical antenna portion 2 and the antenna conductor 8 of the whip antenna portion 6 that does not generate electrostatic capacitance is required, and therefore the insulating portion 5 is provided. is there.

However, in the antenna having the structure shown in FIG. 1, when a load is applied to the antenna in the lateral direction, the antenna bends to absorb the load. In this case, this load is mainly absorbed by the synthetic resin tube 7 having elasticity.
The stress concentrates on the boundary portion (insulating portion 5) where the conductive sleeve 4 and the tube 7 having no elasticity are joined, and therefore, the whip antenna 6 may be broken from this portion. become. In particular, when the antenna is housed in the housing, the antenna top 1 is easily broken when a load is applied in the lateral direction.

Therefore, FIG. 2 shows a second embodiment of the present invention in which the antenna is not broken even if a load is applied to the antenna top of the antenna in the lateral direction. In this figure, a part of the antenna is shown in a half sectional view. In this figure,
The diameter of the antenna conductor 18 of the whip antenna portion 16 is about 0.8 mm, and one end of the antenna conductor 18 is fixed to the joint portion 5 by integral molding, and the antenna conductor 18 is covered with a tube 17 made of synthetic resin and having elasticity. The outer diameter of the tube 17 (outer diameter of the whip antenna) is about 1.6 mm. The other end of the antenna conductor 18 is fixed to an insulating stopper 21. Further, a conductive holder 19 fixed to the housing is inserted so as to slide on the whip antenna section 16.

A slit is provided at the lower end of the holder 19, and an elastic ring spring 20 is mounted so as to narrow the gap between the slits.
By setting 0, the holder 19 can securely hold the whip antenna portion 16 by sliding. As the antenna conductor 18 of the whip antenna section 16, for example, a super elastic metal made of nickel-titanium alloy is used. Further, the tube 17 is made of polyacetal, which is a synthetic resin having elasticity. A joint bar 14 is insert-molded in the joint portion 15, and the joint bar 14 is connected to the helical antenna portion 12 housed in the top 11. Further, in the joint portion 15, the coupling bar 14 and the antenna conductor 18 are arranged apart from each other, and one end of the tube 7 is inserted and fixed in the joint portion 15.

A top 11 is molded at the tip of the joint portion 15, and the bobbin 1 is placed inside the top 11.
3 is provided. A coil that operates as the helical antenna unit 12 is wound around the bobbin 13. The helical antenna portion 12 is electrically connected to the coupling bar 14 by electrically connecting one end of the coil to the coupling bar 14. An antenna top 11 is formed by molding a synthetic resin for protecting the coil on the upper surface of the helical antenna portion 12. In addition, as the joint portion 15 formed by integral molding,
For example, engineering plastics and polyether ether ketone are used as the synthetic resin material, and for the antenna top 11, for example, polyester elastomer is used as the synthetic resin material.

Next, a third embodiment of the antenna of the present invention is shown in FIG. 3. In the antenna of the third embodiment shown in the figure, the whip antenna section 6 is capacitively coupled to the holder 22, but the helical antenna 2 is It is electrically connected directly to the holder. The antenna of the third embodiment of the present invention is shown in FIG.
As can be seen from the above, the antenna has many configurations common to the antenna of the first embodiment shown in FIG. That is, the stopper 23 provided at the lower end of the whip antenna unit 6 is insulative, and the configuration in which the holder 22 is not provided with insulation or the like is different. In other configurations, the first embodiment is different. Since the configuration is the same as the above, the different configuration will be described.

In the antenna of the third embodiment of the present invention,
When the whip antenna section 6 is extended, the insulating stopper 23 is inserted and held from below in the holder 22 that is fixed to the housing, so that the antenna conductor 8 in the whip antenna section 6 is held.
The conductive holder 22 and the conductive holder 22 face each other via the tube 7 and the insulating stopper 23, and the whip antenna section 6 is capacitively coupled to the holder 22.
Further, when the whip antenna unit 6 is stored, the sleeve 4 is inserted and held in the holder 22 from above, and the sleeve 4 is directly electrically connected to the conductive holder 22.

As described above, in the antenna of the third embodiment, since the whip antenna section 6 is capacitively coupled, it can be shortened. Further, since the helical antenna unit 2 is directly connected to the radio side circuit, it is necessary to increase the length and / or the diameter of the helical antenna unit 2. Since it is small, it does not impair the function in use. Rather, since the physical size of the helical antenna unit 2 is increased, the directivity characteristic and the gain in the electrical performance are improved, so that the performance of the wireless device can be improved.

In the antennas of the first and second embodiments configured as described above, when the antenna is extended, it is fixed to the radio housing 30 as shown in FIG. 4 (a). The stopper 21 is inserted and held from below in the holder 19, and in this case, the antenna conductor 18 and the holder 19 are capacitively coupled.
Will be capacitively coupled to. Further, when the antenna is stored, as shown in FIG.
Is inserted and held in the holder 19 from above, and in this case, the coupling bar 14 and the holder 19 are capacitively coupled, so that the helical antenna portion 12 is capacitively coupled to the holder 19.

Further, in the antenna of the second embodiment of the present invention, as described above, the outer diameter of the antenna is 1.6 mm.
Since the antenna is made thinner than the conventional antenna and the superelastic metal is used as the conductor 14 of the whip antenna section 16, a more flexible antenna can be obtained.
In addition, the restoring force can be increased. further,
Since the joint portion 15, the antenna conductor 18, and the tube 17 are integrally formed and joined together, the antenna of the present invention can be a strong antenna against a lateral load.

Further, in the antenna of the third embodiment, when the antenna is extended, the stopper 19 is attached to the holder 19 fixed to the radio housing 30 from below as shown in FIG. 4 (a).
Is inserted and held, in this case the antenna conductor 18 and the holder 1
Since 9 and 9 are capacitively coupled, the whip antenna section 16 is capacitively coupled to the holder 19. Further, when the antenna is housed, the joint portion 15 is inserted and held in the holder 19 from above as shown in FIG. 2B, and in this case, the coupling bar 14 and the holder 19 are directly connected. Therefore, since the physical size of the helical antenna unit 2 is increased, the directivity characteristic and the gain in the electrical performance are improved, and the performance of the wireless device can be improved.

When the electrical lengths of the whip antenna section and the helical antenna section are set to about 1/4 wavelength of the signal to be used, the impedance can be lowered and the power can be fed easily. Further, if the electrical length of the whip antenna section and the helical antenna section is set to about half the wavelength of the signal using the antenna, the antenna can be made less susceptible to the operator, and the antenna can be suitable for mobile phones and the like. it can.

[0031]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to provide an antenna having a simple construction and free from contact failure. Further, according to the second embodiment of the present invention, even if a load is applied to the antenna in the lateral direction, stress is not concentrated on the boundary between the joint portion and the antenna conductor but is dispersed, and the antenna may be broken. Can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an antenna of the present invention.

FIG. 2 is a diagram showing a second embodiment of the antenna of the present invention.

FIG. 3 is a diagram showing a third embodiment of the antenna of the present invention.

FIG. 4 is a diagram showing a relationship between an antenna and a housing according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a conventional antenna and a housing.

FIG. 6 is a diagram showing a conventional antenna.

FIG. 7 is a diagram showing another conventional antenna.

[Explanation of symbols]

 1,11,121,203 Top 2,12,120-1,206 Helical antenna part 3,13 Bobbin 4 Hollow sleeve 5 Insulating part 6,16,120-2,201 Whip antenna part 7,17 Tube 8,18 Antenna Conductor 9,19,22,101 Holder 9-1 Outer holder conductor 9-2 Insulating cylinder 10,21 Stopper 14 Combining bar 15 Joint part 20 Ring spring 23 Insulating stopper 30,100,210 Radio equipment housing 103 Power supply part 104 Print Substrate 120,200 Antenna 122 Loading coil 123 Metal fitting 124 Stopping metal fitting 125,205 Cylindrical body 126 Antenna core wire 127 Stopper part 128 End part 202 Mold part 204 Antenna housing 207 Ground part 208 Coaxial cable

Claims (5)

[Claims] 1. A flexible holder fixed to a radio housing and having a conductive holder provided with an insulating means in an insertion hole, an antenna conductor, and the antenna conductor inserted except for a tip portion. A whip antenna part that is made of a tube and is slidable in the holder; a top provided via a conductive sleeve having one end fixed to the distal end of the flexible tube; A conductive stopper provided on the other end of the flexible tube and connected to the antenna conductor, and a helical antenna portion housed in the top and connected to the other end of the sleeve, The sleeve and the antenna conductor are insulated,
The sleeve and the holder are capacitively coupled by the sleeve being slidably held by the holder, and the stopper and the holder are capacitively coupled by the stopper being slidably held by the holder. An antenna characterized by coupling. 2. A conductive holder fixed to a radio casing, a whip antenna portion which is formed by covering an antenna conductor with a flexible tube and slidably inserted into the holder. A top provided at one end of the whip antenna via an insulating joint portion, and an insulating stopper provided at the other end of the whip antenna, and housed in the top and at the joint portion. A helical antenna portion connected to the insert molded coupling bar, wherein the antenna conductor and the coupling bar are molded separately in the joint portion, the joint portion,
Alternatively, when the stopper is slidably held by the holder, the joint portion or the stopper and the holder are capacitively coupled to each other. 3. A conductive holder fixed to a radio housing, an antenna conductor, and a flexible tube in which the antenna conductor is inserted except for a tip portion, and slides on the holder. A flexible whip antenna section, a top provided via a conductive sleeve having one end fixed to the distal end of the flexible tube, and an insulation provided at the other end of the flexible tube. And a helical antenna portion that is housed in the top and is connected to the other end of the sleeve, and the sleeve and the antenna conductor are insulated from each other,
Since the sleeve is slidably held in the insertion hole of the holder, the sleeve and the holder are directly electrically connected, and the stopper is slidably held in the insertion hole of the holder, An antenna, wherein the whip antenna section and the holder are capacitively coupled. 4. The antenna according to claim 1, wherein a coil bobbin around which a coil constituting the helical antenna section is wound is fitted in the top. 5. The antenna according to claim 2, wherein the joint portion is formed of a high-strength insulating material.