JPH05299921A - Antenna coupler - Google Patents

Abstract

PURPOSE:To provide the antenna coupler able to simply connect a radio equipment having a rod antenna projecting from a casing to an external device. CONSTITUTION:The antenna coupler 2 has an antenna coupling part 5 connecting a rod antenna 4 projecting from a casing of a radio equipment 1 to an external device 12, fitted to the antenna 4 externally it the axial direction to keep the fitting state, and the coupler 2 is featured in such a way that an inner conductor 6 to surround the antenna 4 inserted to the antenna coupling part 5 and an outer conductor 7 at the outside of the inner conductor 6 are arranged to the antenna coupling part 5 to form a coaxial transmission line 10, each end of the inner conductor 6 and the outer conductor 7 is connected to each core wire and a brazed wire of the coaxial cable and the other end of the outer conductor 7 is connected electrically to ground of the radio equipment 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna coupling device, and more particularly to an antenna coupling device for connecting a rod-shaped antenna protruding from a housing of a wireless device and an external device.

[0002]

2. Description of the Related Art A rod-shaped antenna protruding from the housing of a wireless device such as a portable wireless communication device cannot be removed from the housing depending on the type of the wireless device.

[0003]

When measuring the transmission power and the receiving sensitivity of this wireless device, it was necessary to remove the case and connect it to the measuring instrument with a coaxial cable from the test terminal inside.

In many portable radio communication equipment, an antenna is directly attached to the radio equipment and used, but it is difficult to measure the performance in the usage state including the antenna. This measurement is usually made via the propagation space. That is, the measurement is performed by the signal level of the transmission / reception antenna for measurement placed at an appropriate distance, but a measurement environment for preventing reflection of radio waves is required. For example, there is no tall building around, and it was necessary to mount the radio device under test and the antenna for measurement on a pole having a height of about 20 m, and to measure them apart from each other by about 30 m.

Therefore, an object of the present invention is to provide an antenna coupling device that enables a wireless device having a rod-shaped antenna protruding from a housing to be easily connected to an external device such as a measuring instrument. ..

[0006]

In order to achieve the above object, an antenna coupling device according to the present invention is an antenna coupling device for connecting a rod-shaped antenna protruding from a housing of a wireless device and an external device. There is an antenna coupling part that can be externally fitted to the antenna in the axial direction to maintain the fitted state, and the antenna coupling part has an inner conductor along which the antenna inserted therein is surrounded and an inner conductor. An outer conductor located outside the conductor is arranged so as to form a coaxial transmission line, and one end of each of the inner conductor and the outer conductor is connectable to a core wire and a braided wire of a coaxial cable, respectively.
The other end of the outer conductor can be electrically coupled to the ground side of the wireless device.

Further, it is preferable that the other end of the outer conductor is connected to a holder made of a conductor, which is attached to a casing of the wireless device, and the holder can be coupled to the ground side of the wireless device at a high frequency. ..

Further, it is preferable that the other end of the outer conductor is detachably connected to a ground side terminal of the wireless device.

[0009]

The antenna coupling portion is axially fitted onto the rod-shaped antenna protruding from the housing. An inner conductor and an outer conductor are arranged along the antenna coupling portion so as to form a coaxial transmission line so as to surround the antenna, and one end of each of the inner conductor and the outer conductor is a core wire and a braided wire of a coaxial cable, respectively. And can be connected to an external device by a coaxial cable. The other end of the outer conductor can be electrically coupled to the ground side of the wireless device by high frequency coupling or directly detachably.

In the case of transmission from the wireless device, the high frequency power applied to the antenna is high frequency coupled by the coaxial transmission line formed by the inner conductor and the outer conductor and transmitted to the external device. The opposite is true.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an antenna coupling device according to the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, a rod-shaped antenna 4 projects from a casing 3 of a wireless device 1 such as a portable wireless communication device, and the antenna coupling part of the antenna coupling device 2 is detachably attached to the antenna 4. 5 is externally fitted. In the antenna coupling portion 5, an inner conductor 6 extending so as to surround the antenna 4 inserted therein and an outer conductor 7 outside the inner conductor 6 are arranged so as to form a coaxial transmission line 10. .. The inner conductor 6 and the outer conductor 7 are formed by electrical conductors.

One end of the antenna coupling portion 5 has a coaxial cable 1
1 is connected to an external device 12 such as a measuring instrument. One end 7a of the outer conductor 7 on the opposite side of the coaxial cable 11 among the end portions of the outer conductor 7 is electrically connected to a holding portion 8 made of an electric conductor. Further, an insulating film is attached to the surface of the one end 7a facing the side surface 3a of the casing 3 in order to electrically insulate the side surface 3a of the casing 3.

The holder 8 is connected to an enclosure holder 9 attached to the enclosure 3 of the wireless device 1. Case holder 9
Is made of an electric conductor and is bent on both sides facing each other.
And has a bent portion 9b on one side intersecting with the bent portion 9a. The housing 3 placed on the housing holder 9 can be taken out and put in the direction of the arrow in FIG. 1 while being guided by the bent portion 9a. By pushing the side surface 3a until it comes into contact with the bent portion 9b, the antenna 4 is almost entirely inserted into the antenna coupling portion 5.

The casing holder 9 is electrically coupled to the ground side of the wireless device 1 (not shown) disposed inside the casing 3 in terms of high frequency.

Next, the antenna coupling section 5 will be described in detail with reference to FIG. In FIG. 3, the inner conductor 6 has a tubular shape coaxial with the antenna 4 to be inserted. The inner conductor 6 is tapered at one end and becomes a core wire 13 of the coaxial cable 11.
It is connected to the. The other end is slightly shorter than the length of the outer conductor 7 so as not to come into contact with the side surface 3a of the casing 3. The output side end of the coaxial transmission line 10 formed by the inner conductor 6 and the outer conductor 7 is processed by an electric circuit (not shown) so as to be impedance-matched with the characteristic impedance of the coaxial cable 11. This coaxial transmission line 1
The length of 0 is substantially equal to the length of the antenna 4 of the wireless device 1. That is, the length of the coaxial transmission line 10 is about ¼ wavelength of the transmission wavelength of the wireless device 1.

An inner coating 15 made of an insulating material is provided inside the inner conductor 6 for protection. An outer conductor 7 having a tubular shape is arranged outside the inner conductor 6. One end of the outer conductor 7 is connected to the braided wire 14 of the coaxial cable 11.
And is electrically connected to the coupling portion 8 made of a conductor at the other end. A tubular insulator 16 is provided between the inner conductor 6 and the outer conductor 7, and an outer coating 17 is provided on the outer side of the outer conductor 7.

In this embodiment, the inner conductor 6 and the outer conductor 7 have a tubular shape. However, the inner conductor 6 and the outer conductor 7 do not necessarily have the tubular shape.
It suffices that and form the coaxial transmission line 10. Therefore, the cross-sectional shape of the coaxial transmission line may be polygonal, and each of the inner conductor 6 and the outer conductor 7 may be composed of a plurality of members arranged in a tubular shape. Also, the outer conductor 7
May be a braided wire. Next, the operation of this embodiment will be described. The rod-shaped antenna 4 protruding from the housing 3 while guiding the side surface of the wireless device 1 to the side surface 9 a of the housing holding portion 9.
Is inserted into the antenna coupling section 5.

One end of the outer conductor 7 is electrically coupled at high frequency to the ground side of the wireless device 1 via the casing holder 9 and the casing, and the inner conductor 6 and the outer conductor 7 are coaxial. Since the transmission line 10 is formed, the radio wave radiated from the antenna 4 is high-frequency coupled with the inside of the coaxial transmission line 10 and is transmitted to the external device 12.

According to the configuration of this embodiment, since the inner conductor 6 and the outer conductor 7 are provided so as to form the coaxial transmission line 10, the high frequency power applied to the antenna 4 of the wireless device 1 is generated by the inner conductor 6. The coaxial transmission line 10 formed by the outer conductor and the outer conductor provides high frequency coupling.

Further, since the inner conductor 6 and the outer conductor 7 are connected to the coaxial cable 11 at one end of the antenna coupling portion 5, the signal received by the coaxial transmission line 10 is transmitted to the external device 12 to facilitate power and the like. Can be measured.

Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the coaxial cable 11 is not directly connected to the output side end of the coaxial transmission line 10,
Instead, the coaxial connector 20 is connected. The other structure is the same as that of the embodiment shown in FIG.

According to the configuration of this embodiment, the coaxial transmission line 10
Since the coaxial connector 20 is provided at the output-side end of the antenna coupling device 2, the antenna coupling device 2 can be made compact, and handling such as transportation and storage can be easily performed.

Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 5, an enclosure surrounding body 30 made of a flexible conductor for surrounding the enclosure 3 of the wireless device 1 is connected to the holding portion 8 fixed to the end of the antenna coupling portion 5. There is. The end portion of the outer conductor 7 on the input side is electrically connected to the enclosure body 30 via the holding portion 8.

Further, the enclosure 30 is provided with a bent portion 30.
a, 30b, 30c, and bent portions 30b, 30c
Velcro tapes 31b and 31c are attached to the respective ends of the.

Next, the operation of this embodiment will be described. The antenna 4 of the wireless device 1 is inserted into the antenna coupling portion 5 and pushed to put the antenna coupling device 2 and the antenna 4 into a fitted state. Next, the bent portion 30a of the enclosure 30 is indicated by the arrow A.
In the direction of arrow B, and then bend the bent portion 30b in the direction of arrow B and bend it with the magic tape 31b.
a and 30b are attached to each other, and then the bent portion 30c is bent in the direction of arrow C, and the bent portions 30b and 30c are attached to each other with a magic tape 31c.

As a result, the outer conductor 7 can be coupled to the ground side of the wireless device 1 at a high frequency due to the capacity of the enclosure 30.

According to the structure of this embodiment, since the enclosure body 30 electrically connected to the outer conductor 7 is provided, the antenna coupling device 2 receives the radio wave from the wireless device 1 with a simple structure. can do.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 6, a coupling wire 40 coupled to the outer conductor 7 is provided at the input-side end of the antenna coupling device 2, and a U-shaped terminal 41 is connected to the end of the coupling wire 40. The terminal 41 can be detachably connected to the ground terminal 42 of the wireless device 1. Here, the ground terminal 42 is a ground-side terminal of the electronic circuit inside the housing 3.

According to the configuration of this embodiment, the terminal 41 connected to the outer conductor 7 is provided, so that the antenna coupling device 2 can be made compact with respect to the radio device having the ground terminal 42.

The rod-shaped antenna includes not only a single rod-shaped antenna but also a coil-spring-shaped antenna.

[0032]

As described above, according to the present invention,
By externally fitting the antenna coupling device to the antenna, the wireless device having the rod-shaped antenna protruding from the housing can be easily connected to the external device.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a state in which an antenna coupling device according to the present invention is used in a wireless device.

FIG. 2 is a perspective view showing a first embodiment of the antenna coupling device of the present invention.

FIG. 3 is a sectional view showing an antenna coupling portion of the first embodiment of the antenna coupling device of the present invention.

FIG. 4 is a sectional view showing an antenna coupling portion of a second embodiment of the antenna coupling device of the present invention.

FIG. 5 is a perspective view showing a third embodiment of the antenna coupling device of the present invention.

FIG. 6 is a perspective view showing a fourth embodiment of the antenna coupling device of the present invention.

[Explanation of symbols]

 1 Radio Equipment 2 Antenna Coupling Device 3 Enclosure 4 Antenna 5 Antenna Coupling Unit 6 Inner Conductor 7 Outer Conductor 7 8 Holding Part 9 Encasement Holding Part 10 Coaxial Transmission Line 11 Coaxial Cable 12 External Device 13 Core Wire 14 Braided Wire 15 Inner Cover 16 Insulator 17 Outer coating 20 Coaxial connector 30 Enclosure surrounding body 40 Coupling wire 41 Terminal 42 Ground terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01Q 1/48 7037-5J

Claims (3)

[Claims] 1. An antenna coupling device for connecting a rod-shaped antenna projecting from a housing of a wireless device and an external device, the antenna coupling device being fitted onto the antenna in an axial direction thereof to maintain a fitted state. The antenna coupling part has an inner conductor extending along the circumference of the antenna to be inserted into the antenna coupling part and an outer conductor outside the inner conductor so as to form a coaxial transmission line. , One end of each of the inner conductor and the outer conductor can be connected to a core wire and a braided wire of a coaxial cable, respectively, and the other end of the outer conductor can be electrically coupled to the ground side of the wireless device. Antenna coupling device. 2. The other end of the outer conductor is attached to a casing of a wireless device and connected to a holder made of a conductor, and the holder is capable of high-frequency coupling to the ground side of the wireless device. The antenna coupling device according to claim 1. 3. The antenna coupling device according to claim 1, wherein the other end of the outer conductor is detachably connected to a ground-side terminal of the wireless device.