CN109713421B

CN109713421B - Antenna device

Info

Publication number: CN109713421B
Application number: CN201811572248.XA
Authority: CN
Inventors: 王亚猛; 李光军; 邓波; 刘力攀; 魏巍; 陈敏慎; 谢宏晓; 杨靖; 杨帆
Original assignee: 722th Research Institute of CSIC
Current assignee: 722th Research Institute of CSIC
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-10-02
Anticipated expiration: 2038-12-21
Also published as: CN109713421A

Abstract

The invention discloses an antenna device, and belongs to the field of antennas. The antenna device comprises a first antenna, a second antenna, an elastic clamping bushing and a locking nut, wherein the first end of the first antenna is movably inserted into the first end of the second antenna, the locking nut is sleeved outside the first antenna, the inner wall of the locking nut, the end face of the first end of the second antenna and the peripheral wall of the first antenna form an annular cavity, the elastic clamping bushing is sleeved outside the first antenna, the elastic clamping bushing is located in the annular cavity, the elastic clamping bushing is conical, the end face of the end with the larger outer diameter of the elastic clamping bushing is abutted to the end face of the first end of the second antenna, and the peripheral wall of the elastic clamping bushing is attached to the inner wall of the conical cavity. The first antenna and the second antenna are relatively fixed by screwing the locking nut, the connection mode is reliable, larger friction force can be generated between the elastic clamping bush and the first antenna by screwing the locking nut, and the first antenna and the second antenna are not easy to loosen.

Description

Antenna device

Technical Field

The present invention relates to the field of antennas, and in particular, to an antenna device.

Background

Antenna devices are important components of communication systems for the transmission and reception of signals.

The telescopic antenna is a common antenna device, and the telescopic antenna comprises a first antenna and a second antenna which are sleeved together, and when the telescopic antenna is not used, the first antenna can be retracted into the second antenna, so that the length of the antenna device is shortened. In use, the first antenna may be pulled out of the second antenna, increasing the length of the antenna arrangement.

The first antenna and the second antenna are both conical, when the first antenna is pulled out of the second antenna, the end with the larger diameter of the first antenna is inserted into the end with the smaller diameter of the second antenna, the first antenna tightly stretches the second antenna, certain friction force is generated between the first antenna and the second antenna, and therefore the first antenna is kept in an extending state. When the first antenna is pulled out, the used force is different, the tensioning degree between the first antenna and the second antenna is different, and the first antenna and the second antenna are unreliable in connection and easy to loosen.

Disclosure of Invention

The embodiment of the invention provides an antenna device which can prevent a first antenna and a second antenna from loosening. The technical scheme is as follows:

the embodiment of the invention provides an antenna device, which comprises a first antenna, a second antenna, an elastic clamping bush and a locking nut, wherein the second antenna is of a tubular structure, the first antenna and the second antenna are respectively provided with a first end and a second end which are opposite, the first end of the first antenna is movably inserted into the first end of the second antenna, the locking nut is sleeved outside the first antenna, the inner wall of the locking nut comprises a cylindrical inner wall, a circular ring plane and a conical inner wall which are coaxial, the end with the larger diameter of the conical inner wall is connected with the inner circle of the circular ring plane, the cylindrical inner wall is connected with the outer circle of the circular ring plane, the cylindrical inner wall is provided with an internal thread which is used for being in threaded connection with the first end of the second antenna, the inner wall of the locking nut, the end face of the first end of the second antenna and the outer peripheral wall of the first antenna enclose a circular ring cavity, elastic clamping bush cover is established outside the first antenna, elastic clamping bush is located the annular cavity, elastic clamping bush is the circular cone type, the terminal surface of the great one end of external diameter of elastic clamping bush with the terminal surface of the first end of second antenna offsets, elastic clamping bush's periphery wall with circular cone type inner wall pastes.

Optionally, the first end of the first antenna is provided with an outer flange, the first end of the second antenna is provided with an inner flange, and an outer diameter of the outer flange is larger than an inner diameter of the inner flange.

Optionally, a first limiting structure is arranged on an end face, close to the inner flange, of the outer flange, a second limiting structure is arranged on an end face, close to the outer flange, of the inner flange, and the first limiting structure and the second limiting structure are matched with each other to circumferentially lock the first antenna and the second antenna.

Optionally, one of the first limiting structure and the second limiting structure is a limiting protrusion, and the other of the first limiting structure and the second limiting structure is a limiting groove.

Optionally, there are a plurality of limiting grooves, and the plurality of limiting grooves are distributed around the axis of the second antenna in an equiangular circumferential manner.

Optionally, the antenna device further comprises a first prompting device and a contact switch, the contact switch is electrically connected with the first prompting device, the first antenna is tubular, an opening is formed in the tube wall of the first antenna, the contact switch is located in the first antenna, the contact switch is located at the opening, a trigger protrusion is arranged on the inner wall of the elastic clamping bushing, and the trigger protrusion is used for triggering the contact switch to be conducted when the contact switch is in contact with the trigger protrusion.

Optionally, the contact switch includes two metal elastic pieces, each metal elastic piece has a fixed end and a free end, the fixed end is fixed in the first antenna, the free end is located at the opening, and the free ends of the two metal elastic pieces are arranged oppositely.

Optionally, the inner wall of the elastic clamping bush is provided with a plurality of triggering protrusions, and the plurality of triggering protrusions are distributed along the circumferential direction of the elastic clamping bush.

Optionally, the antenna further comprises an inductance coil and a second prompting device, the inductance coil is sleeved outside the first antenna or the second antenna, and the inductance coil is electrically connected with the second prompting device.

Optionally, a matched circumferential limiting structure is arranged between the end face of the end with the larger outer diameter of the elastic clamping bush and the end face of the first end of the second antenna.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least: through inserting first antenna in the second antenna to suit elasticity clamping bush and lock nut outside first antenna, lock nut and second antenna threaded connection, because the terminal surface of the great one end of external diameter of elasticity clamping bush offsets with the terminal surface of the first end of second antenna, the periphery wall of elasticity clamping bush pastes with lock nut's circular cone type inner wall, consequently when screwing up lock nut, the terminal surface of second antenna can promote elasticity clamping bush, lock nut's circular cone type inner wall extrusion elasticity clamping bush makes elasticity clamping bush extrude first antenna, is held tightly first antenna by elasticity clamping bush. The first antenna and the second antenna are relatively fixed by screwing the locking nut, the connection mode is reliable, larger friction force can be generated between the elastic clamping bush and the first antenna by screwing the locking nut, and the first antenna and the second antenna are not easy to loosen.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic partial structural diagram of an antenna device according to an embodiment of the present invention;

FIG. 2 is a partial schematic structural view of a lock nut according to an embodiment of the present invention;

fig. 3 is a schematic partial structure diagram of a first antenna according to an embodiment of the present invention;

fig. 4 is a schematic partial structural diagram of a second antenna according to an embodiment of the present invention;

fig. 5 is a schematic partial structure diagram of a second antenna according to an embodiment of the present invention;

FIG. 6 is a schematic view of a resilient clamping bushing according to an embodiment of the present invention;

fig. 7 is a schematic partial structure diagram of an antenna apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic partial structure diagram of an antenna apparatus according to an embodiment of the present invention. As shown in fig. 1, the antenna device includes a first antenna 11, a second antenna 12, an elastic clamp bushing 20, and a lock nut 30. The second antenna 12 is a tubular structure, the first antenna 11 and the second antenna 12 both have opposite first and second ends, and the first end of the first antenna 11 is movably inserted into the first end of the second antenna 12.

The lock nut 30 is sleeved outside the first antenna 11. Fig. 2 is a partial structural schematic view of a lock nut according to an embodiment of the present invention. As shown in fig. 2, the inner wall of the lock nut 30 includes a cylindrical inner wall 30a, a circular ring plane 30b and a conical inner wall 30c which are coaxial, one end of the conical inner wall 30c having a larger diameter is connected to the inner circle of the circular ring plane 30b, and the cylindrical inner wall 30a is connected to the outer circle of the circular ring plane 30 b. The cylindrical inner wall 30a is provided with an internal thread for screw-coupling with the first end of the second antenna 12. The inner wall of the locking nut 30, the end surface of the first end of the second antenna 12 and the outer peripheral wall of the first antenna 11 enclose an annular cavity a.

The elastic clamping bush 20 is sleeved outside the first antenna 11, and the elastic clamping bush 20 is located in the annular cavity A. The elastic clamp bush 20 is conical, the end face of the end of the elastic clamp bush 20 having a larger outer diameter abuts against the end face of the first end of the second antenna 12, and the outer peripheral wall of the elastic clamp bush 20 abuts against the conical inner wall 30 c.

Through inserting first antenna in the second antenna to suit elasticity clamping bush and lock nut outside first antenna, lock nut and second antenna threaded connection, because the terminal surface of the great one end of external diameter of elasticity clamping bush offsets with the terminal surface of the first end of second antenna, the periphery wall of elasticity clamping bush pastes with lock nut's circular cone type inner wall, consequently when screwing up lock nut, the terminal surface of second antenna can promote elasticity clamping bush, lock nut's circular cone type inner wall extrusion elasticity clamping bush makes elasticity clamping bush extrude first antenna, is held tightly first antenna by elasticity clamping bush. The first antenna and the second antenna are relatively fixed by screwing the locking nut, the connection mode is reliable, larger friction force can be generated between the elastic clamping bush and the first antenna by screwing the locking nut, and the first antenna and the second antenna are not easy to loosen.

As shown in fig. 1, the first end of the first antenna 11 may be provided with an outer flange 111, and the first end of the second antenna 12 may be provided with an inner flange 121, and the outer diameter of the outer flange 111 is greater than the inner diameter of the inner flange 121. The cooperation of the inner flange 121 and the outer flange 111 may prevent the first antenna 11 from being separated from the second antenna 12.

The outer diameter of the outer flange 111 may be the same as the inner diameter of the first antenna 11, and the inner diameter of the inner flange 121 may be the same as the outer diameter of the first antenna 11, so that the first antenna 11 and the second antenna 12 may be moved relatively more smoothly.

Alternatively, the end surface of the outer flange 111 close to the inner flange 121 may be provided with a first limiting structure, and the end surface of the inner flange 121 close to the outer flange 111 may be provided with a second limiting structure. The first and second limiting structures are matched to each other to circumferentially lock the first and

second antennas

11 and 12. Through the arrangement of the first limiting structure and the second limiting structure, abrasion caused by rotation of the first antenna 11 relative to the second antenna 12 when the locking nut 30 is screwed can be avoided.

Fig. 3 is a schematic partial structure diagram of a first antenna according to an embodiment of the present invention. As shown in fig. 3, the first position-limiting structure is a position-limiting protrusion 1111. Fig. 4 is a schematic partial structure diagram of a second antenna according to an embodiment of the present invention. As shown in fig. 4, the second position-limiting structure is a position-limiting groove 121 a. After the first antenna 11 is pulled out, the first antenna 11 may be rotated such that the limit projection 1111 is caught in the limit groove 121a, so that the first antenna 11 cannot be rotated during the process of screwing the locking nut 30.

Alternatively, the plurality of limiting grooves 121a may be provided, and the plurality of limiting grooves 121a are distributed circumferentially around the axis of the second antenna 12 at equal angles. When the antenna device is used, in addition to pulling the first antenna 11 out of the second antenna 12, the first antenna 11 may sometimes need to be rotated by a certain angle relative to the second antenna 12 to obtain a better signal transceiving effect. Through setting up a plurality of spacing recesses 121a, can block into suitable spacing recess 121a with spacing arch 1111 like this to obtain better signal transceiver effect.

In another embodiment of the present invention, the first position-limiting structure may be a position-limiting recess 121a, and the second position-limiting structure may be a position-limiting protrusion 1111. That is, the limit recess 121a is provided on the outer flange 111, and the limit projection 1111 is provided on the inner flange 121.

Alternatively, the limiting protrusion 1111 may have a cylindrical shape, a conical shape, a hemispherical shape, or the like, and the shape of the limiting recess 121a may be the same as the shape of the limiting protrusion 1111, so that when the limiting protrusion 1111 is snapped into the limiting recess 121a, the surface of the limiting protrusion 1111 may be attached to the surface of the limiting recess 121 a.

As shown in fig. 1, the antenna device may further include a first prompting device (not shown) and a contact switch 40. The contact switch 40 is electrically connected to the first prompting device, the first antenna 11 is tubular, an opening 11a is arranged on a tube wall of the first antenna 11, the contact switch 40 is located in the first antenna 11, and the contact switch 40 is located at the opening 11 a. The inner wall of the elastic clamp bush 20 has a trigger protrusion 21, and the trigger protrusion 21 is used to trigger the contact switch 40 to be turned on when contacting the contact switch 40. When in use, the first antenna 11 can be pulled out by a proper length as required, and then the lock nut is tightened to fix the first antenna 11 and the second antenna 12. When the first antenna 11 is pulled, if the first antenna 11 is pulled to a proper position, the opening 11a of the tube wall of the first antenna 11 will face the trigger protrusion 21, and when the locking nut 30 is screwed, the elastic clamping bush 20 is squeezed, and the trigger protrusion 21 will extend into the opening 11a, so as to trigger the contact switch 40, and make the contact switch 40 conduct. At this time, the first prompting device sends out a prompting message, and the worker can know whether the first antenna 11 is pulled to a proper position according to the prompting message. In addition, since the elastic clamping bushing 20 is deformed enough to trigger the contact switch 40 by the trigger protrusion 21 only after the lock nut 30 is tightened to a certain extent, it is also possible to know whether the lock nut 30 is sufficiently tightened according to the prompt message sent by the first prompt means, and to prevent the lock nut 30 from being over-fed or over-tightened.

Alternatively, a matching circumferential stop structure may be provided between the end face of the end of the resilient clamping bush 20 having the larger outer diameter and the end face of the first end of the second antenna 12. The circumferential stop prevents the elastic clamping bushing 20 from rotating when the union nut 30 is screwed in.

The circumferential stop structure may comprise mating ridges and grooves. Fig. 5 is a schematic partial structure diagram of a second antenna according to an embodiment of the present invention. As shown in fig. 5, a plurality of ribs 122 may be disposed on the end surface of the first end of the second antenna 12, and the ribs 122 extend along the radial direction of the second antenna 12. Fig. 6 is a schematic structural diagram of an elastic clamping bush according to an embodiment of the present invention. As shown in fig. 6, the end surface of the end of the elastic clamping sleeve 20 with the larger outer diameter may be provided with a plurality of grooves 20a, the grooves 20a extend along the radial direction of the elastic clamping sleeve 20, and the protruding ribs 122 are clamped in the grooves 20a, so that when the lock nut 30 is screwed, the second antenna 12 pushes the elastic clamping sleeve 20, the elastic clamping sleeve 20 can slide inwards along the protruding ribs 122 when the elastic clamping sleeve 20 is deformed, and the elastic clamping sleeve 20 cannot rotate with the lock nut 30 due to the cooperation of the protruding ribs 122 and the grooves 20 a. While 4 ribs 122 are shown in fig. 5 and 4 grooves 20a are shown in fig. 6, in practice, other numbers of ribs 122 and other numbers of grooves 20a may be provided, at least one of the ribs 122 and the grooves 20a may be provided, and the number of ribs 122 may be less than the number of grooves 20 a.

As shown in fig. 6, the elastic clamping bush 20 may have a plurality of trigger protrusions 21 on an inner wall thereof, and the plurality of trigger protrusions 21 are distributed along a circumferential direction of the elastic clamping bush 20. Since it may be necessary to rotate the first antenna 11 relative to the second antenna 12 by a certain angle during use, by providing a plurality of trigger protrusions 21, after rotating the first antenna 11 by a certain angle, there may still be trigger protrusions 21 facing the opening 11a to trigger the contact switch 40 after tightening the lock nut 30.

Alternatively, the opening 11a may be located at the first end of the first antenna 11, and when the length of the first antenna 11 drawn out reaches the maximum, the opening 11a faces the trigger protrusion 21. When the antenna device is used, the first antenna 11 and the second antenna 12 are usually pulled to the longest state, and when the length of the first antenna 11 is pulled to the longest, the opening 11a faces the trigger protrusion 21, so that it is ensured that the first antenna 11 can be pulled to the longest state when the antenna device is used.

As shown in fig. 1, the contact switch 40 may include two metal elastic pieces 41, the metal elastic pieces 41 having a fixed end fixed in the first antenna 11 and a free end located at the opening 11a, the free ends of the two metal elastic pieces 41 being arranged opposite to each other. The trigger protrusion 21 pushes the free ends of the two metal elastic pieces 41 to be close to each other after being pressed into the opening 11a, and when the free ends of the two metal elastic pieces 41 contact each other, the contact switch 40 is turned on.

The metal dome 41 and the first antenna 11 may be insulated from each other. Because the first antenna 11 and the second antenna 12 are both metal pieces, the metal elastic pieces 41 and the first antenna 11 are arranged in an insulating manner, so that the first antenna 11 can be prevented from being connected with the two metal elastic pieces 41. For example, the surface layer of the metal elastic sheet 41 may be provided with an insulating paint, and the contact portion between the two metal elastic sheets 41 is not covered with the insulating paint, so that the two metal elastic sheets 41 can be conducted after being contacted.

The first antenna 11 may be provided with two openings 11a, and the two openings 11a are centrosymmetric with respect to the axis of the first antenna 11, so that the two metal elastic pieces 41 can be pushed by the two trigger protrusions 21 simultaneously, and the two metal elastic pieces 41 are contacted and conducted.

The first prompting device may include a signal light, a buzzer, or a combination thereof, and accordingly, the prompting signal emitted by the first prompting device may be a light signal, a sound signal, or a combination thereof. The signal lamp can be a light-emitting diode, and the power of the light-emitting diode is low, so that the power consumption is reduced. For example, a light emitting diode may be disposed on an outer wall of the first antenna 11, the light emitting diode and the two metal elastic pieces 41 may be electrically connected by a wire, and the light emitting diode may be turned on when the two metal elastic pieces 41 contact each other. A wire connecting the light emitting diodes may be provided in the first antenna 11. The power supply for driving the light emitting diode can also be arranged in the first antenna 11, and the power supply can be a button battery, so that the size is small and the installation is convenient. When the first prompting device is disposed on the peripheral wall of the first antenna 11, the first prompting device should not exceed the outer surface of the first antenna 11, so as to prevent the first prompting device from affecting the expansion and contraction of the first antenna 11.

Alternatively, the first prompting device may be disposed on the end face of the second end of the first antenna 11, which can facilitate the disposition of the first prompting device and avoid drilling holes on the side wall of the first antenna 11. And when the first prompting device comprises a signal lamp, the signal lamp is positioned on the end face of the second end of the first antenna 11, and the emitted light signal is more striking and more easily perceived.

Referring to fig. 1, the antenna device may further include an inductor coil 50 and a second prompting device (not shown). The inductance coil 50 is sleeved outside the first antenna 11 or the second antenna 12, and the inductance coil 50 is electrically connected with the second prompting device. When the antenna device transmits radio waves, the radio waves pass through the inductance coil 50, so that current is generated in the inductance coil 50, the second prompting device connected with the inductance coil 50 works to send out prompting information to inform surrounding personnel that the antenna device is transmitting the radio waves, a warning effect can be achieved, and the personnel are prevented from approaching or touching the antenna device.

Alternatively, the inductor 50 may be sleeved outside the second antenna 12, so that the inductor 50 may not affect the reception of the first antenna 11 into the second antenna 12.

The second prompting device may include a signal light, a buzzer, or a combination thereof, and accordingly, the prompting signal emitted by the second prompting device may be a light signal, a sound signal, or a combination thereof. The signal lamp can be a light-emitting diode, and the power of the light-emitting diode is low, so that the power consumption is reduced.

When the first prompting device and the second prompting device are simultaneously arranged, the prompting information sent by the first prompting device and the prompting information sent by the second prompting device are different, so that personnel can distinguish conveniently. For example, the first prompting device is a signal lamp, the prompting information sent by the first prompting device is a light signal, the second prompting device is a buzzer, and the prompting information sent by the second prompting device is a sound signal. When the first prompting device and the second prompting device both include signal lamps, the color of the light signal emitted by the first prompting device may be different from the color of the light signal emitted by the second prompting device, for example, the light signal emitted by the first prompting device is green, and the light signal emitted by the second prompting device is red. When both the first and second prompting devices include a buzzer, the sound signal emitted by the first prompting device may be different from the sound signal emitted by the second prompting device.

Optionally, the second antenna 12 may be sleeved with a cylindrical housing 52, and the inductor 50 may be disposed inside the cylindrical housing 52 to provide protection for the inductor 50. The second prompting device may be provided on the cylindrical housing 52 for ease of installation.

Fig. 7 is a schematic partial structure diagram of an antenna apparatus according to an embodiment of the present invention. As shown in fig. 7, the second prompting device may include a plurality of signal lights 51, the plurality of signal lights 51 are distributed on the outer wall of the cylindrical housing 52 along the circumferential circumference of the cylindrical housing 52, and by providing one turn of the signal lights 51, it is possible to make the signal lights 51 visible to people in different directions.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An antenna device is characterized by comprising a first antenna (11), a second antenna (12), an elastic clamping sleeve (20) and a locking nut (30), wherein the second antenna (12) is of a tubular structure, the first antenna (11) and the second antenna (12) are respectively provided with a first end and a second end which are opposite, the first end of the first antenna (11) is movably inserted into the first end of the second antenna (12), the first end of the first antenna (11) is provided with an outer flange (111), the first end of the second antenna (12) is provided with an inner flange (121), the outer diameter of the outer flange (111) is larger than the inner diameter of the inner flange (121), the locking nut (30) is sleeved outside the first antenna (11), the inner wall of the locking nut (30) comprises a cylindrical inner wall (30a), a circular ring plane (30b) and a conical inner wall (30c), the end face of the end with the larger diameter of the conical inner wall (30c) is connected with the inner circle of the circular ring plane (30b), the cylindrical inner wall (30a) is connected with the outer circle of the circular ring plane (30b), the cylindrical inner wall (30a) is provided with an inner thread which is used for being in threaded connection with the first end of the second antenna (12), the inner wall of the locking nut (30), the end face of the first end of the second antenna (12) and the peripheral wall of the first antenna (11) enclose an annular cavity (A), the elastic clamping bushing (20) is sleeved outside the first antenna (11), the elastic clamping bushing (20) is located in the annular cavity (A), the elastic clamping bushing (20) is conical, the end face of the end with the larger outer diameter of the elastic clamping bushing (20) is abutted to the end face of the first end of the second antenna (12), the outer peripheral wall of the elastic clamping bush (20) is attached to the conical inner wall (30 c).

2. The antenna device according to claim 1, wherein a first limiting structure is provided on an end surface of the outer flange (111) close to the inner flange (121), and a second limiting structure is provided on an end surface of the inner flange (121) close to the outer flange (111), and the first limiting structure and the second limiting structure are matched with each other to circumferentially lock the first antenna (11) and the second antenna (12).

3. The antenna device according to claim 2, wherein one of the first and second limiting structures is a limiting protrusion (1111) and the other of the first and second limiting structures is a limiting recess (121 a).

4. The antenna device according to claim 3, wherein the plurality of the stopper grooves (121a) are arranged in an equiangular circumferential distribution around the axis of the second antenna (12).

5. The antenna device according to any one of claims 1 to 4, further comprising a first prompting device and a contact switch (40), wherein the contact switch (40) is electrically connected with the first prompting device, the first antenna (11) is tubular, an opening (11a) is formed in a tube wall of the first antenna (11), the contact switch (40) is located in the first antenna (11), the contact switch (40) is located at the opening (11a), a trigger protrusion (21) is arranged on an inner wall of the elastic clamping bushing (20), and the trigger protrusion (21) is used for triggering the contact switch (40) to conduct when contacting with the contact switch (40).

6. The antenna device according to claim 5, wherein the contact switch (40) comprises two metal domes (41), the metal domes (41) having a fixed end fixed within the first antenna (11) and a free end located at the opening (11a), the free ends of the two metal domes (41) being arranged opposite to each other.

7. The antenna device according to claim 5, characterized in that the inner wall of the resilient clamping bushing (20) has a plurality of said activating projections (21), the plurality of activating projections (21) being distributed along the circumference of the resilient clamping bushing (20).

8. The antenna device according to any one of claims 1 to 4, further comprising an inductor (50) and a second prompting device, wherein the inductor (50) is sleeved outside the first antenna (11) or the second antenna (12), and the inductor (50) is electrically connected with the second prompting device.

9. The antenna device according to any of claims 1 to 4, characterized in that a matched circumferential limiting structure is arranged between the end surface of the end with the larger outer diameter of the elastic clamping bush (20) and the end surface of the first end of the second antenna (12).