JPH09162633A - Surface mount antenna and antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the surface mount antenna and the antenna system able to be made small in size and whose cost is reduced through the simplified manufacturing process. SOLUTION: In the surface mount antenna 10, a radiation electrode 2 is extended from one end face of a base body 1 to the other end face via a major side and further extended from the other end face to the one side face via the major side, and a gap 3 is formed by dividing part of the radiation electrode 2. Then one end of the radiation electrode 2 acts like a feeding terminal at one side face of the base body 1 and the other end acts like a ground terminal 9 at one end side of the base body 1. The antenna system is formed by mounting the surface mount antenna 10 onto a board 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount antenna and an antenna device, and more particularly to a surface mount antenna and an antenna device for mobile communication devices and local area networks (LAN).

[0002]

2. Description of the Related Art A conventional surface mount antenna and an antenna device using the surface mount antenna will be described with reference to FIG.

In FIG. 5, reference numeral 61 denotes a substantially rectangular parallelepiped base made of a dielectric or magnetic material. Inside the base 61, two through-holes 62, which are open to two opposing end faces and have a substantially cylindrical shape, are formed. And the inner wall of the through hole 62 is coated with, for example, copper to form the radiation electrode 63. Through hole 62
A power supply electrode 64 that is electrically connected to the radiation electrode 63 is formed on one end surface of the base 61 that is open, and end surface electrodes 65 a and 65 b are formed on both sides of the power supply electrode 64 so as to be insulated from the power supply electrode 64. Then, on the other end surface of the base 61 in which the through hole 62 is opened, a capacitive loading electrode 66 that is electrically connected to the radiation electrode 63.
Are formed, and the surface-mounted antenna 70 is formed.

The surface mount antenna 70 is mounted on the printed circuit board 67, and the feeding electrode 64 and the printed circuit board 67 are mounted.
The antenna device 7 is formed by soldering or connecting the upper feed line 68 and the end electrodes 65a and 65b to the ground electrode 69 on the printed circuit board 67 with an adhesive or the like.
1 is formed. As a result, the surface mount antenna 70
In, it is possible to feed power to the radiation electrode 63 and to send and receive high frequency signals.

[0005]

However, the surface mount antenna 70 has the following problems.

Generally, there is a demand for miniaturization of the antenna, and in the surface mount type antenna 70, one method of maintaining the frequency characteristics and realizing miniaturization is to use the capacitance loading electrode 66 and the end face electrodes 65a and 65b. There is a way to increase the capacity between them. As described above, in order to increase the capacitance between the capacitance loading electrode 66 and the end face electrodes 65a and 65b, the substrate 61 is generally formed using a material having a large dielectric constant, but the dielectric constant is There is a problem in that Q increases as the size increases and the frequency band narrows. Further, since the manufacturing process such as the process of forming the through hole 62 and the process of forming the radiation electrode 63 on the inner wall of the through hole 62 is complicated, the cost is high.

Therefore, the present invention provides a surface mount antenna and an antenna device which can maintain the frequency characteristic and can be miniaturized, and can reduce the cost by simplifying the manufacturing process. The purpose is to

[0008]

In order to achieve the above object, in a surface mount antenna according to the present invention, a base body and one end surface of the base body, one main surface, one side surface, the other end surface, and the other end surface are provided. A radiation electrode extending through at least two of the side surfaces, one end serving as a power supply terminal and the other end serving as a ground terminal; and a gap formed by dividing a part of the radiation electrode. It is characterized by

Further, the radiation electrode is formed so as to return from the one end face of the base body to the one end face via any one of the other faces.

Further, the radiation electrode is formed so as to bend from one end face of the base body through one main face to the other end face, and return from the other end face to the one end face via the one main face. And

Further, the radiation electrode is formed in a substantially loop shape so as to return from the one end face of the substrate to the one end face through the one side face, the other end face and the other side face.

Further, in the antenna device according to the present invention, the surface mount antenna is mounted on a printed circuit board having a feed electrode and a ground electrode, the feed terminal and the feed electrode are connected to each other, and the ground terminal is connected to the ground terminal. It is characterized in that it is connected to the ground electrode.

In the surface mount antenna constructed as described above, the formation of the gap increases the capacitance component of the antenna. Therefore, the frequency characteristics are maintained and the size is reduced without using a substrate having a high dielectric constant. It is possible to

Further, since the radiation electrode is formed on the surface of the substrate, the manufacturing process is simplified and the cost is reduced.

Further, by forming the radiation electrode so as to surround the end surface and the side surface of the substrate, the radiation electrode can be made longer, so that the frequency band is broadened.

[0016]

FIG. 1 is a block diagram showing an embodiment of the present invention.
It will be described in detail with reference to FIG.

In FIG. 1, reference numeral 1 denotes a substantially rectangular parallelepiped base made of a dielectric or magnetic material. On the surface of the base 1, a radiation electrode 2 extends from one end face to one end face to the other end face, and to the other end. The surface mount antenna 10 is formed by extending from the end face to one side face and dividing a part of the radiation electrode 2 to provide the gap 3. Here, one end of the radiation electrode 2 serves as a power supply terminal 7 on one side surface of the base body 1, and the other end serves as a ground terminal 8 on one end surface of the base body 1.

The surface mount antenna 10 is placed on the printed circuit board 4, and the power supply terminal 7 and the power supply electrode 5 on the printed circuit board 4, and the ground terminal 8 and the ground electrode 6 on the printed circuit board 4 are soldered. Alternatively, the antenna device 11 is formed by connecting with an adhesive or the like. As a result, in the surface-mounted antenna 10, power can be supplied to the radiation electrode 2 and high-frequency signals can be transmitted and received.

In the surface-mounted antenna 10, since the gap 3 forming a capacitance component can be provided in a part of the radiation electrode 2 to increase the antenna capacitance, the frequency can be increased without using a substrate having a large dielectric constant. It is possible to maintain the characteristics and reduce the size.

Further, in the surface mount antenna 10, the radiation electrode 2 is formed so as to wrap around the main surface, the side surface and the end surface of the substrate 1, and the length of the radiation electrode 2 becomes long, so that the frequency band is widened and the size is reduced. It is suitable for

In the surface mount antenna 10, the radiation electrode 2 can be formed by printing a conductor, and the gap 3 is not formed in the radiation electrode 2 when the radiation electrode 2 is formed by printing the conductor. Since it can be formed by providing the printed portion, the manufacturing process is simplified.

Another embodiment of the present invention is shown in FIG.

In FIG. 2, reference numeral 21 denotes a substantially rectangular parallelepiped base body made of a dielectric or magnetic material, and a radiation electrode 22 is bent on the surface of the base body 21 from one end surface of the base body 21 to one main surface and the other end surface. Further, the radiation electrode 22 is formed so as to have a substantially U shape so as to return from the other end face to the one end face through the one main face, and the radiation electrode 22 is partially divided to form the gap 2
3 is provided to form the surface mount antenna 30. Here, one end of the radiation electrode 22 serves as the power supply terminal 27 on one end surface of the base 21, and the other end is the same as the base 2.
The ground terminal 28 is formed on the one end surface of the terminal 1.

The surface mount antenna 30 is placed on the printed board 24, and the power supply terminal 27 and the printed board 24 are provided.
The antenna device 31 is formed by soldering or connecting the upper power supply electrode 25 and the ground terminal 28 to the ground electrode 26 on the printed circuit board 24 with an adhesive or the like. Thereby, in the surface mount antenna 30,
It is possible to supply power to the radiation electrode 22 and to send and receive high frequency signals.

In the surface-mounted antenna 30, since the gap 23 forming a capacitive component can be provided in a part of the radiation electrode 22 to increase the antenna capacity,
It is possible to maintain the frequency characteristics and reduce the size without using a substrate having a large dielectric constant.

In the surface mount antenna 30, one end of the radiation electrode 22 and the power supply terminal 27 are provided on the base 21.
1 is not provided on one side surface but on one end surface.
Different from the surface mount antenna 10 shown in FIG. in this way,
Since the radiation electrode 22 is formed so as to return to the one end surface of the substrate 21, the radiation electrode 22 is longer than the radiation electrode 2 of the surface-mounted antenna 10, and the size can be further reduced.

Further, in the surface mount antenna 30, the radiation electrode 22 can be formed by printing a conductor as in the surface mount antenna 10 shown in FIG. When the conductor is printed, the radiation electrode 22 can be formed by providing a non-printed portion, so that the manufacturing process is simplified and the cost is reduced.

Further, as shown in FIG. 3, a portion of the radiation electrode 22 adjacent to the gap 23 is formed in a substantially L shape so that the major axes thereof face each other, so that the surface mounting shown in FIG. Since the facing surface is larger than that of the die antenna 10, the capacitance component of the antenna is larger. Therefore, further miniaturization is possible.

Further, another embodiment of the present invention is shown in FIG.

In FIG. 4, reference numeral 41 denotes a substantially rectangular parallelepiped base made of a dielectric or magnetic material. On the surface of the base 41, a radiation electrode 42 extends from one end face to one end face to the other end face, and the other end The radiation electrode 4 is formed in a substantially loop shape so as to return from the end face to the one end face via the other side face.
A gap 43 is provided by dividing a part of 2 to form the surface mount antenna 50. Then, one end of the radiation electrode 42 becomes the power supply terminal 47 and the other end becomes the ground terminal 48.

The surface mount antenna 50 is placed on the printed circuit board 44, and the feeding terminals 47 and the printed circuit board 44 are mounted.
The antenna device 51 is formed by soldering or connecting the upper power supply electrode 45 and the ground terminal 48 to the ground electrode 46 on the printed circuit board 44 with an adhesive or the like. Thereby, in the surface mount antenna 50,
It is possible to supply power to the radiation electrode 42 and to send and receive high frequency signals.

In the surface mount antenna 50, since the gap 43 forming the capacitance component is provided in a part of the radiation electrode 42, the capacitance of the antenna can be increased.
It is possible to maintain the frequency characteristics and reduce the size without using a substrate having a large dielectric constant.

Further, in the surface mount antenna 50, since the radiation electrode 42 is formed so as to surround the end surface and the side surface of the base 41, the radiation electrode 42 is different from the surface mount antenna 30 shown in FIG. It is even longer and can be made even smaller.

Further, in the surface mount antenna 50, the radiation electrode 42 can be formed by printing a conductor, as in the surface mount antenna 10 shown in FIG. When the conductor is printed, the radiation electrode 42 can be formed by providing a non-printed portion, so that the manufacturing process is simplified and the cost is reduced.

The shape of the radiation electrode and the position of the gap provided in the radiation electrode are not limited to those described in the above embodiments.

[0036]

As described above, in the surface-mounted antenna according to the present invention, since the gap for forming the capacitance component is provided in a part of the radiation electrode, the capacitance of the antenna can be increased, so that the permittivity is increased. The frequency characteristic can be maintained and the size can be reduced without using a high-quality substrate.

Further, since the radiation electrode is formed on the surface of the substrate, the manufacturing process is simplified and the cost is reduced.

Further, by forming the radiation electrode so as to surround the end face and the side face of the substrate, the radiation electrode becomes long and the frequency band is widened, which is suitable for downsizing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an antenna device in which a surface mount antenna according to an embodiment of the present invention is mounted on a printed board.

FIG. 2 is a perspective view showing an antenna device in which a surface mount antenna according to another embodiment of the present invention is mounted on a printed board.

FIG. 3 is a perspective view showing a modified example of the antenna device of FIG.

FIG. 4 is a perspective view showing an antenna device in which a surface mount antenna according to still another embodiment of the present invention is mounted on a printed board.

FIG. 5 is a perspective view showing an antenna device in which a conventional surface mount antenna is mounted on a printed board.

[Explanation of symbols]

 1, 21, 41 Substrate 2, 22, 42 Radiation electrode 3, 23, 43 Gap 4, 24, 44 Printed circuit board 5, 25, 45 Power supply electrode 6, 26, 46 Ground electrode 7, 27, 47 Power supply terminal 8, 28 , 48 Ground terminal 10, 30, 50 Surface mount type antenna 11, 31, 51 Antenna device

Claims (5)

[Claims] 1. A base body and one end surface of the base body extending through at least two surfaces of one main surface, one side surface, the other end surface, and the other side surface, one end serving as a power supply terminal, and the other end. A surface mount antenna, comprising: a radiation electrode serving as a ground terminal; and a gap formed by dividing a part of the radiation electrode. 2. The surface according to claim 1, wherein the radiation electrode is formed so as to return from the one end face of the base body to the one end face via any one of the other faces. Mounted antenna. 3. The radiation electrode is formed so as to be bent from one end face of the base body through one main face to the other end face and return from the other end face to the one end face via the one main face. The surface mount antenna according to claim 2. 4. The radiation electrode is formed in a substantially loop shape so as to return from the one end face of the base body to the one end face through the one side face, the other end face and the other side face. The surface mount antenna described. 5. The surface mount antenna according to any one of claims 1 to 4 is mounted on a printed circuit board having a feed electrode and a ground electrode, the feed terminal and the feed electrode are connected to each other, and An antenna device comprising a ground terminal and the ground electrode connected to each other.