JP2003209422A - Folded antenna and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] PROBLEM TO BE SOLVED: To provide a folded antenna having a folded radiating conductor mounted on a printed circuit board and having stable performance with little possibility that the radiating conductor is deformed when forming a dielectric layer. I will provide a. SOLUTION: The radiation conductor has two segments 12A and 12B.
The two radiation conductor segments are divided into dielectric layers
The short-circuit terminals 20A and 20B connected to one pad 24 of the printed circuit board 22 are formed at one end of the two radiating conductor segments, respectively. A folded antenna in which a folded radiation conductor is formed by being short-circuited on the pad 24.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an antenna having a folded radiation conductor and a method for manufacturing the antenna.

[0002]

2. Description of the Related Art In a wireless communication terminal such as a mobile phone, it is known to mount a small antenna on a printed circuit board in order to reduce its size. In order to further miniaturize the wireless communication terminal, it is necessary to miniaturize the antenna as much as possible. To miniaturize the antenna,
It is effective to fold the radiation conductor.

FIG. 15 shows a small antenna in which the radiation conductor is folded back. The antenna 10 has a structure in which the radiation conductor 12 is folded back along the surface of the dielectric layer 14. A feeding terminal 16 is formed on one end side of the radiation conductor 12, and the other end side is an open end.

In such a folded antenna 10, a substantially U-shaped radiation conductor 12 as shown in FIG. 16 is formed of a metal plate, which is then set in a die for molding a dielectric layer to emit radiation. It is manufactured by filling and molding a dielectric material inside the conductor 12.

[0005]

However, the above-mentioned small antenna has the following problems when the radiation conductor 12 is formed into a substantially U-shape unless its height h is finished with a very high accuracy. Occurs. That is, if the height h is too high, the rising portion is deformed when set in the molds 18A and 18B as shown in FIG. 17A, and the antenna performance is not stable. Also, if the height h is too low, FIG.
When set in the molds 18A and 18B as shown in, a gap S is formed between the radiation conductor 12 and the mold 18A.
Since the dielectric material may get inside, the radiation conductor 12 is also deformed and the antenna performance is not stable.

In view of the above problems, an object of the present invention is to provide a folded antenna with stable performance, which is less likely to deform the radiating conductor at the time of molding the dielectric layer, and a manufacturing method thereof. It is in.

[0007]

A folded antenna according to the present invention is an antenna mounted on a printed circuit board, wherein a radiation conductor is divided into two segments, and these two radiation conductor segments form a dielectric layer. Stacked through
Short-circuit terminals connected to one pad of the printed circuit board are formed on one ends of the two radiating conductor segments, respectively, and the two short-circuit terminals are short-circuited on the pad to fold back the radiation. It is characterized in that a conductor is formed.

With such a configuration, the radiation conductor is divided into two segments, and the interval between the two radiation conductor segments can be accurately set by the die for molding the dielectric layer. For this reason, the dimensional variation when bending and shaping the radiating conductor does not affect the antenna performance as in the past, and the variation in the spacing between the two radiating conductor segments can be reduced, so that a folded antenna with stable performance can be provided. It becomes possible to obtain.

In the folded antenna according to the present invention, the two radiating conductor segments may be plate-shaped except for the short-circuit terminal, or may be meander-shaped.

The folded antenna according to the present invention preferably has a structure in which a parasitic conductor is sandwiched between the dielectric layers. In this way, the band of the folded antenna can be widened.

The folded antenna according to the present invention may have a configuration in which a parasitic conductor is laminated outside one of the radiating conductor segments with a dielectric layer interposed therebetween.

A folded antenna according to the present invention is an antenna mounted on a printed circuit board, wherein a radiation conductor is divided into three segments, and these three radiation conductor segments are laminated via a dielectric layer, Short-circuit terminals connected to the first pads of the printed circuit board are formed on one end sides of the radiation conductor segments of the lowermost layer and the intermediate layer, respectively, and on the other end sides of the radiation conductor segments of the intermediate layer and the uppermost layer, respectively. A short-circuit terminal connected to the second pad of the printed circuit board is formed, two short-circuit terminals on one end side are on the first pad, and two short-circuit terminals on the other end side are the first short-circuit terminals. A folded-back type radiation conductor can be formed by short-circuiting the two pads.

In the folded type according to the present invention, a feeding terminal is formed on the other end side of one radiation conductor segment, and a ground terminal is formed on the other end side of the other radiation conductor segment, and the feeding terminal is printed. On the power supply pad of the board,
A loop antenna may be configured by connecting the ground terminal to the ground conductor of the printed board.

In the folded antenna according to the present invention, a plurality of the folded antennas may be arranged on a printed board, and the radiation conductor segments of each antenna may be connected in a helical shape to form a helical antenna.

The folded antenna according to the present invention can be configured as a meander antenna by arranging a plurality of the antennas on a printed board and connecting the radiating conductor segments of each antenna in a meandering shape.

One method of manufacturing a folded antenna according to the present invention is to arrange two radiating conductor segments at a predetermined interval in a mold and fill a dielectric material between the two radiating conductor segments. After the dielectric layer is formed by forming the dielectric layer, the short-circuit terminal of at least one of the two radiation conductor segments is bent and formed at one end side.

Another method of manufacturing a folded antenna according to the present invention is a first metal tape in which one radiating conductor segment is continuously formed with a plurality of tops each having a shape supported by tie bars in a frame, and And a second metal tape in which a plurality of tops each having a radiating conductor segment supported by tie bars are continuously formed in a frame, and the inner surface of one radiating conductor segment formed on the first metal tape is prepared. Is formed integrally with the first dielectric layer half, and the second dielectric layer half is integrally formed on the inner surface of the other radiation conductor segment formed on the second metal tape. The dielectric layer half and the second dielectric layer half are joined, the tie bar supporting the two radiating conductor segments is cut, and at least one of the two radiating conductor segments has a short-circuit terminal (printer) on one end side. It may be bent and formed (so that it can be soldered to the short-circuit pad of the board).

Another method of manufacturing a folded antenna according to the present invention is a first metal tape in which one radiating conductor segment is continuously formed with a large number of pieces in a frame supported by tie bars, and The second metal tape in which the radiating conductor segment of is formed with a large number of tops continuously supported by tie bars in the frame, and the parasitic conductor is provided with a large number of tops continuously supported by tie bars in the frame. Prepare the formed third metal tape, integrally mold the first dielectric layer half part on the inner surface of the one radiation conductor segment formed on the first metal tape, to the second metal tape After integrally molding the second dielectric layer half part on the inner surface of the other formed radiating conductor segment, the first dielectric layer half part and the second dielectric layer half part are placed between the third dielectric layer half part and the third dielectric layer half part. Formed on metal tape The two radiating conductor segments and the tie bar supporting the parasitic conductor are cut, and at least one short-circuit terminal of the two radiating conductor segments is bent and formed at one end side. May be

Another method of manufacturing a folded antenna according to the present invention is a first metal tape in which one radiating conductor segment is continuously formed with a large number of pieces in a frame supported by tie bars, and The second metal tape in which the radiating conductor segment of is formed with a large number of tops continuously supported by tie bars in the frame, and the parasitic conductor is provided with a large number of tops continuously supported by tie bars in the frame. The formed third metal tape is prepared, and the first dielectric layer portion is integrally formed on both surfaces or one surface of one radiation conductor segment formed on the first metal tape, and the second metal tape is formed. The second dielectric layer portion is integrally formed on one or both surfaces of the other radiation conductor segment formed on the third dielectric tape, and the third dielectric is formed on both surfaces of the parasitic conductor formed on the third metal tape. After the layer portions are integrally molded, the first dielectric layer portion is bonded to one surface of the third dielectric layer portion and the second dielectric layer portion is bonded to the other surface, and two radiation conductor segments are formed. Alternatively, the tie bar supporting the parasitic conductor may be cut, and the short-circuit terminal of at least one of the two radiating conductor segments may be bent and formed at one end side.

[0020]

Embodiments of the present invention will be described below.
A detailed description will be given with reference to the drawings.

First Embodiment FIG. 1 shows an embodiment of the present invention. In this folded antenna 10, the radiation conductor is divided into two segments 12A and 12B. The two radiation conductor segments 12A and 12B are laminated and integrated via a dielectric layer 14. Two radiating conductor segments 12A, 12
Short-circuit terminals 20A and 20B are formed on one end side of B, respectively. A power supply terminal 16 is formed on the other end of the lower radiation conductor segment 12B.

When this antenna 10 is mounted on the printed circuit board 22, as shown in FIG.
A and 20B are connected to one short-circuit pad 24 formed on the printed circuit board 22 by soldering 26, and the power supply terminal 16 is connected to the power supply pad 28 by soldering 30. As a result, the two short-circuit terminals 24A and 24B are short-circuited, so that the two radiating conductor segments 12A and 12B form one continuous folded-type radiating conductor.

The folded antenna 10 as described above is
For example, it can be manufactured as shown in FIGS. First, by processing a metal plate, as shown in (A), a radiating conductor segment 12A having a short-circuit terminal 20A on one end side.
Then, the radiating conductor segment 12B having the short-circuiting terminal 20B at one end and the feeding terminal 16 at the other end is manufactured. These two radiating conductor segments 12A and 12B are molded into a mold as shown in (B).
It is set in 18A and 18B, and a dielectric material is injection-molded to form a dielectric layer. After that, the molds 18A and 18B are opened, the molded product is taken out, and one short-circuit terminal 20A is bent to obtain the antenna 10 as shown in FIG. The other short-circuit terminal 20B may be bent after the dielectric layer is formed, and the short-circuit terminal 20B may not be bent.

According to this manufacturing method, the distance between the two radiation conductor segments 12A and 12B is determined only by the molds 18A and 18B, so that the two radiation conductor segments 12A and 12B are separated.
Variations in the B spacing are reduced, and a folded antenna with stable performance can be obtained.

Further, the folded antenna 10 as shown in FIG.
For efficient mass production, it is advisable to adopt the manufacturing method as shown in FIGS. In this method, first,
A first metal tape 32A as shown in (A) and (B),
A second metal tape 32B as shown in FIGS.
To prepare. The first metal tape 32A is one in which one radiating conductor segment 12A is formed by continuously forming a large number of tops 38A in a frame 34A supported by tie bars 36A. The second metal tape 32B is formed by continuously forming a plurality of tops 38B in which the other radiation conductor segment 12B is supported by a tie bar 36B in a frame 34B. Note that 40A and 40B are positioning holes formed at the four corners of the tops 38A and 38B. Such first metal tape 32
The A and the second metal tape 32B can be manufactured by punching or pattern etching the metal tape.

Next, as shown in FIG. 5 (A), the first dielectric layer half portion 14A is integrally formed on the inner surface of the radiating conductor segment 12A on the first metal tape 32A side, and at the same time the second metal layer is formed. The second dielectric layer half portion 14B is integrally formed on the inner surface of the radiation conductor segment 12B on the tape 32B side. A convex portion 42A for coupling is formed on the first dielectric layer half portion 14A, and a concave portion 42B for coupling is formed on the second dielectric layer half portion 14B.
The dielectric layer halves 14A and 14B can be continuously and efficiently molded by the continuous injection molding machine while the metal tapes 32A and 32B are frame-fed.

Next, as shown in FIG. 5B, the convex portion 42A
And the concave portion 42B are fitted to join the first dielectric layer half portion 14A and the second dielectric layer half portion 14B. Then, a tie bar 36 supporting each radiating conductor segment 12A, 12B.
Cut A and 36B. Simultaneously with (or after) the cutting, the two short-circuit terminals 20A and 20B are bent and formed at one end so that they can be soldered to the pads of the printed circuit board (the short-circuit terminal 20B of the lower radiation conductor segment 12B is The second metal tape 32B may be preliminarily bent and formed at the stage of manufacturing the same, or may not be bent and formed like the power supply terminal 16). This completes the folded antenna 10 as shown in FIG.

[Second Embodiment] FIG. 6 shows another embodiment of the present invention. FIG. 6 is a diagram corresponding to FIG. 4 of the first embodiment. In the first embodiment, the radiation conductor has a plate shape, but in this embodiment, the radiation conductor has a meandering shape. Even when the radiation conductor has a meandering shape, as in the first embodiment, the radiation conductor is divided into two radiation conductor segments, and the short-circuit terminals of the two radiation conductor segments are short-circuited on the pad when mounted on the printed board. Thus, the folded meandering radiation conductor may be formed.

In order to mass-produce a folded antenna having a meandering radiation conductor, first, a first metal tape 32A as shown in FIGS. 6 (A) and 6 (B) and FIGS. 6 (C) and 6 (D) are used. A second metal tape 32B as shown is prepared. The first metal tape 32A has one meandering radiation conductor segment 44
A is a frame 34A in which a large number of tops 38A supported by tie bars 36A are continuously formed. The second metal tape 32B is formed by continuously forming a plurality of tops 38B in which the other meandering radiation conductor segment 44B is supported by the tie bar 36B in the frame 34B. Note that 40A and 40B are positioning holes.

Hereinafter, as in the first embodiment, the first dielectric layer half portion is integrally formed on the inner surface of one meandering radiation conductor segment 44A, and the first dielectric layer half portion is formed on the inner surface of the other meandering radiation conductor segment 44B. After the two dielectric layer halves are integrally molded, the first dielectric layer half and the second dielectric layer half are joined. After that, the tie bars 36A and 36B supporting the two meandering radiation conductor segments 44A and 44B are cut, and the shorting terminals 20A and 20B of the two meandering radiation conductor segments can be soldered to the pads of the printed circuit board at one end side. Bend to form. This completes the folded antenna with a meandering radiation conductor.

[Third Embodiment] FIG. 7 shows still another embodiment of the present invention. The folded antenna 10 has a flat parasitic conductor 46 interposed in the middle of the dielectric layer 14. The other configuration is the same as that of the folded antenna shown in FIGS. 1 and 2, and therefore, the same portions are denoted by the same reference numerals and the description thereof will be omitted. By thus interposing the parasitic conductor 46 in the middle of the dielectric layer 14, electrical coupling between the upper radiation conductor segment 12A and the lower radiation conductor segment 12B is suppressed, and a wider band can be achieved.

The folded antenna 10 having the parasitic conductor 46 as described above can be manufactured, for example, as follows. First, first metal tapes 32A and 32B as shown in FIG. 4 (or FIG. 6) are prepared. Next, on the inner surface of the radiation conductor segment 12A on the first metal tape 32A side, as shown in FIG.
As shown in (A), the first dielectric layer half portion 14A is integrally molded, and the second dielectric layer half portion 14B is also integrally formed on the inner surface of the radiation conductor segment 12B on the second metal tape 32B side. (This point is similar to FIG. 5).

Next, the third metal tape 32C is supplied between the first metal tape 32A and the second metal tape 32B. This third metal tape 32C is, as shown in FIG.
The parasitic conductor 46 is formed by continuously forming a large number of tops 38C supported by the tie bars 36C in the frame 34C. The parasitic conductor 46 has a convex portion of the first dielectric layer half portion 14A.
A hole 48 through which 42A passes is formed.

Next, as shown in FIG. 8C, the first dielectric layer half portion 14A and the second dielectric layer half portion 14B are sandwiched between the parasitic conductors 46 of the third metal tape 32C. Bind to. After that, the tie bars 36A, 36B, 36C supporting the two radiation conductor segments 12A, 12B and the parasitic conductor 46 are cut, and the short-circuit terminals 20A, 20B of the two radiation conductor segments 12A, 12B are connected to the printed circuit board at one end side. Bend and mold so that it can be soldered to the pad. With this, the folded antenna 10 as shown in FIG. 7 is completed.

A folded antenna having a parasitic conductor as shown in FIG. 7 can also be manufactured as shown in FIG. First, first metal tapes 32A and 32B as shown in FIG. 4 (or FIG. 6) and third metal tape 32C as shown in FIG. 8 (B) are prepared. Next, as shown in FIG. 9A, the radiating conductor segment 12A of the first metal tape 32A.
The first dielectric layer portions 14P are formed on both surfaces of the radiation conductor segment 12 of the second metal tape 32B (see FIG. 4A).
Second dielectric layer portion 14Q on both sides of C (see FIG. 4C)
Of the third metal tape 32C and the parasitic conductor 46 (see FIG. 8).
The third dielectric layer portion 14R is formed on both surfaces of (see (B)).

Rod-shaped protrusions 50 are integrally formed at the four corners of the upper and lower surfaces of the third dielectric layer portion 14R. The first dielectric layer portion 14P and the second dielectric layer portion 14Q are formed with holes 52P and 52Q through which the rod-shaped projection 50 passes. Also, for the radiation conductor segment 12A of the first metal tape 32A and the radiation conductor segment 12B of the second metal tape 32B,
Holes (not shown) corresponding to the holes 52P and 52Q are formed. The upper end of the hole 52P and the lower end of the hole 52Q are enlarged in a dish shape. The length of the rod-shaped projection 50 is the first dielectric layer portion.
The thickness of 14P is set to be slightly longer than the thickness of the second dielectric layer portion 14Q.

As described above, the metal tapes 32A, 32B,
After forming the dielectric layer portions 14P, 14Q and 14R on 32C, the dielectric layer portions 14P, 14Q and 14R are laminated as shown in FIG. 9B. That is, the first dielectric layer portion 14P is laminated on the third dielectric layer portion 14R so that the rod-shaped projection 50 penetrates the hole 52P, and the first dielectric layer portion 14P is stacked below the third dielectric layer portion 14R. The second dielectric layer portion 14Q is laminated so that the rod-shaped projection 50 penetrates the hole 52Q. Then, the first dielectric layer portion 14P
A bar-shaped projection 50 is projected on the upper surface of the second dielectric layer portion 14Q.
Since the bar-shaped projection 50 projects from the lower surface of the, the projecting portion of the bar-shaped projection 50 is heated and caulked. As a result, the projecting portion of the rod-shaped projection 50 is expanded into the expanded diameter portion of the holes 52P and 52Q, so that the three dielectric layer portions 14P, 14Q and 14R are integrated.

After that, the two radiating conductor segments 12
Tie bars 36A, 36 supporting A, 12B and the parasitic conductor 46
Cut B and 36C, two radiating conductor segments at one end
The short-circuit terminals 20A and 20B of 12A and 12B are formed by bending so that they can be soldered to the short-circuit pad 24 of the printed circuit board, and the power supply terminal 16 is bent at the other end side so that they can be soldered to the power-supply pad 28 of the printed circuit board. Mold. As a result, FIG.
The folded antenna 10 as shown in (C) to (E) is completed.

Fourth Embodiment FIG. 10 shows still another embodiment of the present invention. This folded antenna 10 has a dielectric layer portion 14 on the outside of one radiation conductor segment 12A.
A parasitic conductor 46 is laminated via P and 14R.
That is, the folded antenna shown in FIGS. 9C to 9E.
The radiating conductor segment 12A in which the first dielectric layer portion 14P is integrated with the parasitic conductor 46 in which the third dielectric layer portion 14R is integrated are replaced with each other. Other configurations are the folded antennas shown in FIGS. 9 (C) to 9 (E).
Since it is similar to 10, the same parts are denoted by the same reference numerals and the description thereof is omitted.

[Fifth Embodiment] FIG. 11A shows still another embodiment of the present invention. This folded antenna 10
The radiating conductor is divided into three segments 12A, 12B, 12C. These three radiating conductor segments 12A, 12
B and 12C are laminated with a dielectric layer 14 interposed therebetween. Radiation conductor segments 12C and 12B in the bottom and middle layers
Short-circuit terminals 20A and 20B1 are formed on one end side of each of them, and short-circuit terminals 20B2 and 20C are formed on the other end sides of the radiating conductor segments 12B and 12C of the middle layer and the uppermost layer, respectively. A feeding terminal 16 is formed on the other end side of the lowermost radiating conductor segment 12A.

When the antenna 10 is mounted on the printed circuit board 22, the two short-circuit terminals 20A and 20B1 on one end side are provided.
The first short-circuit pad 24 formed on the printed circuit board 22.
The two short-circuit terminals 20B2 and 20C on the other end side, which are connected to A by soldering, are connected to the second short-circuit pad 24B formed on the printed circuit board 22 by soldering, and the power supply terminal 16
Are connected to the power supply pad 28 by soldering. As a result, the two short-circuit terminals 20A and 20B1 are short-circuited at one end side,
Since the two short-circuit terminals 20B2 and 20C are short-circuited at the other end side, the three radiating conductor segments 12A, 12B and 12C form a continuous folded-back radiating conductor as shown in FIG. 11 (B). .

[Sixth Embodiment] FIG. 12A shows still another embodiment of the present invention. In this embodiment, the folded antenna 10 constitutes a loop antenna as shown in FIG. Similar to the first embodiment, the folded antenna 10 has a radiation conductor divided into two segments 12A and 12B, and two radiation conductor segments 12A and 12B.
Are laminated and integrated via a dielectric layer 14. However, the widths of the radiation conductor segments 12A and 12B and the dielectric layer 14 are narrower than those of the first embodiment.

Shorting terminals 20A and 20B are formed on one end sides of the two radiation conductor segments 12A and 12B, respectively. A feeding terminal 16 is formed on the other end of the lower radiation conductor segment 12B, and the upper radiation conductor segment 12A is formed.
A ground terminal 54 is formed on the other end side of the.

When this antenna 10 is mounted on the printed circuit board 22, the two short-circuit terminals 20 A and 20 B are connected to one short-circuit pad 24 formed on the printed circuit board 22 by soldering, and the power supply terminal 16 Is connected to the power supply pad 28 by soldering, and the ground terminal 54 is connected to the ground conductor 56 by soldering. As a result, the two short-circuit terminals 24A and 24B are short-circuited, so that the two radiation conductor segments 12A and 12B can form a loop antenna as shown in FIG.

[Embodiment 7] FIG. 13A shows still another embodiment of the present invention. In this embodiment, a plurality of folded antennas 10 are arranged on a printed circuit board 22 to form a helical antenna. The individual folded antenna 10 is structurally the same as the folded antenna shown in FIG. 12A, but the radiation conductor segments 12A, 12
The difference is that B is connected so as to have a helical shape.

That is, the first folded antenna
In 10-1, the short-circuit terminals 20A and 20B formed on one end side of the radiation conductor segments 12A and 12B are connected to the first short-circuit pad 24-1 of the printed circuit board 22, and the radiation conductor segment 12B on the lower side. The terminal 58 formed on the other end side of the
, And the terminal 60 formed on the other end side of the upper radiation conductor segment 12A is connected to the second short-circuit pad 24-2 of the printed circuit board 22.

Next, the second folded antenna 10-2
Is a short circuit terminal 20A, 20B (not shown) formed on one end side of the radiation conductor segments 12A, 12B.
Connected to the third shorting pad 24-3 (not shown)
The terminal 58 formed on the other end side of the lower radiation conductor segment 12B is connected to the second short-circuit pad 24-2 of the printed board 22 and formed on the other end side of the upper radiation conductor segment 12A. Terminal 60 is the fourth shorting pad on PCB 22
Connected to 24-4.

The third folded antenna 10-3 is connected similarly to the second folded antenna 10-2, and the fourth and subsequent antennas are similarly connected. When connected in this manner, the radiating conductor segments 12A, 12B of each folded antenna 10
Are connected in a helical shape as shown in FIG. 13B, and a helical antenna can be formed.

[Embodiment 8] FIG. 14A shows a further embodiment of the present invention. In this embodiment, a plurality of folded antennas 10 are arranged on a printed circuit board 22 to form a meander antenna. The odd-numbered folded antennas 10-1, 10-3, ... Have the same structure as the folded antenna 10 shown in FIG. 12A, and the even-numbered folded antennas 10-2, 10-4 ,. The position of the terminal 60 on the other end side of the upper radiation conductor segment 12A and the position of the terminal 58 on the other end side of the lower radiation conductor segment 12B compared to the folded antenna 10 shown in FIG. It has been replaced.
Otherwise, the folded antenna 10 shown in FIG.
Is the same as.

The arrangement of the power supply pad 28 and the short-circuit pad 24 on the printed circuit board 22 is the same as that shown in FIG.
That is, odd-numbered short-circuit pads 24-1, 24-3, ...
(Pads for short-circuiting the upper and lower radiating conductor segments in the same antenna) are formed on one end side of each folded antenna 10, and even-numbered shorting pads 24-2, 24-4 ,. A pad that short-circuits the segment) is formed on the other end side of each folded antenna 10 so as to straddle the adjacent antennas.

The plurality of folded antennas 10-1, 10-2, 10-3, 10 as described above are attached to the pads arranged in this manner.
-4, ... are mounted, the radiating conductor segments 12A and 12B of the folded antennas are connected in a meandering shape as shown in FIG. 13 (B) to form a meandering antenna.

[0052]

As described above, according to the present invention,
Since the radiating conductor is divided into multiple segments and the spacing between the multiple radiating conductor segments can be set accurately by the die for molding the dielectric layer, there are variations in the spacing between the multiple radiating conductor segments that are folded back. Can be reduced, and a folded antenna with stable performance can be obtained. Further, according to the manufacturing method of the present invention, the folded antenna can be efficiently manufactured. Further, by using the folded antenna of the present invention, a loop antenna, a helical antenna, a meander antenna, etc. can be easily formed on the printed board.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a folded antenna according to the present invention.

FIG. 2 is a side view showing a soldered state of the folded antenna of FIG. 1 on a printed circuit board.

3A is a perspective view showing two radiating conductor segments that constitute the folded antenna of FIG. 1, and FIG. 3B is a sectional view showing a state where the radiating conductor segment of FIG.

4A is a plan view of a first metal tape, FIG. 4B is a side view of the same, and FIG. 4C is a plan view of a second metal tape used for manufacturing the folded antenna of FIG. , (D) is the same side view.

5 is a side view showing one process of manufacturing the folded antenna of FIG. 1 using the first and second metal tapes of FIG. 4, (B) a side view showing the next process of (A), FIG. 3C is a side view showing a folded antenna obtained by this manufacturing method.

6A and 6B are used for manufacturing another embodiment of the folded antenna according to the present invention, FIG. 6A is a plan view of a first metal tape, FIG. 6B is a side view of the same, and FIG. Plan view of the tape, (D) is a side view of the same.

FIG. 7 is a side view showing still another embodiment of the folded antenna according to the present invention.

8A is a side view showing one process of manufacturing the folded antenna of FIG. 7, FIG. 8B is a plan view showing a third metal tape used therefor, and FIG. The side view which shows a process.

9A and 9B are side views showing a process of manufacturing yet another embodiment of the folded antenna according to the present invention, FIG. 9B is a side view showing the next process of FIG. 9A, and FIG. Side view showing a folded antenna obtained by the method, (D)
Is a plan view and (E) is a cross-sectional view.

FIG. 10 shows still another embodiment of the folded antenna according to the present invention, (A) is a side view, (B) is a plan view, and (C) is a sectional view.

FIG. 11A is a perspective view showing yet another embodiment of the folded antenna according to the present invention, and FIG. 11B is a schematic view of the antenna.

FIG. 12A is a perspective view showing a loop antenna configured by using the folded antenna according to the present invention,
(B) is a schematic diagram of the same antenna.

FIG. 13A is a perspective view showing a helical antenna configured by using a folded antenna according to the present invention,
(B) is a schematic diagram of the same antenna.

FIG. 14A is a perspective view showing a meander antenna configured using the folded antenna according to the present invention,
(B) is a schematic diagram of the same antenna.

FIG. 15 is a perspective view showing a conventional folded antenna.

16 is a side view showing a radiation conductor of the folded antenna shown in FIG.

17 (A) and 17 (B) are cross-sectional views showing the problems of the conventional folded antenna.

[Explanation of symbols]

10: Folded antenna 12: Radiation conductor 12A, 12B, 12C: Radiation conductor segment 14: Dielectric layer 14A, 14B: Half of the dielectric layer 14P, 14Q, 14R: Dielectric layer part 16: Power supply terminal 18A, 18B: Mold 20A, 20B: Short circuit terminal 22: Printed circuit board 24: Pad for short circuit 26: Soldering part 28: Power supply pad 30: Soldering part 32A, 32B: Metal tape 34A, 34B: Frame 36A, 36B: Tie bar 38A, 38B: Frame 46: Parasitic conductor 56: Ground conductor 58, 60: Short-circuit terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hironobu Yoshida             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Shinji Sato             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Toshinori Tanaka             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. F-term (reference) 5J046 AA05 AA09 AA19 AB06

Claims (12)

[Claims] 1. An antenna mounted on a printed circuit board, wherein a radiation conductor is divided into two segments (12A, 12B), and these two radiation conductor segments are arranged in a dielectric layer (1).
4), and short-circuit terminals (20A, 20B) connected to one pad (24) of the printed circuit board (22) are formed on one end sides of the two radiation conductor segments. A folded antenna, wherein two short-circuit terminals are short-circuited on the pad (24) to form a folded radiation conductor. 2. The folded antenna according to claim 1, wherein the two radiating conductor segments (12A, 12B) are each formed in a meandering shape. 3. The folded antenna according to claim 1, wherein a parasitic conductor (46) is sandwiched between the dielectric layers (14). 4. The antenna according to claim 1, wherein a dielectric layer (14) is provided outside one of the radiation conductor segments (12A).
A folded antenna in which a parasitic conductor (46) is laminated via P, 14R). 5. An antenna mounted on a printed circuit board, wherein a radiation conductor has three segments (12A, 12B, 12).
C), these three radiation conductor segments are laminated via a dielectric layer (14), and the printed circuit board (22) is provided on one end side of the radiation conductor segments (12A, 12B) of the lowermost layer and the intermediate layer, respectively. ) Is formed with shorting terminals (20A, 20B1) connected to the first pad (24A), and the other ends of the intermediate layer and the uppermost radiating conductor segments (12B, 12C) are respectively connected to the printed circuit board. Short-circuit terminals (20B2, 20C) connected to the second pad (24B) are formed, and two short-circuit terminals (20A, 20B1) on one end side are formed on the first pad (24A). Two short-circuit terminals (20B2,
The folded antenna is characterized in that a folded radiation conductor is formed by short-circuiting 20C) on the second pad (24B). 6. The antenna according to claim 1, wherein the radiating conductor segment (12A) has a feeding terminal (1
6) is formed, and the ground terminal (54) is formed on the other end side of the other radiation conductor segment (12B), and the power supply terminal (16) is connected to the power supply pad (28) of the printed circuit board (22).
In addition, the folded antenna is characterized in that the ground terminal (54) is connected to the ground conductor (56) of the printed circuit board to form a loop antenna. 7. A plurality of folded antennas according to claim 1 are arranged on a printed circuit board (22), and each antenna (10-1,
10-2, 10-3, ...) Radiating conductor segments (12A, 12)
A helical antenna characterized in that B) is connected in a helical shape. 8. A plurality of folded antennas according to claim 1 are arranged on a printed circuit board (22), and each antenna (10-1,
10-2, 10-3, ...) Radiating conductor segments (12A, 12)
A meander antenna in which B) is connected in a meandering shape. 9. A method of manufacturing a folded antenna according to claim 1, wherein two radiating conductor segments (12
A, 12B) are placed in a mold (18A, 18B) at a predetermined interval, and a dielectric material is filled between two radiating conductor segments to form a dielectric layer. A method of manufacturing a folded antenna, characterized in that at least one of the short-circuit terminals (20A) of one radiation conductor segment (12A, 12B) is formed by bending. 10. The method for manufacturing a folded antenna according to claim 1, wherein one of the radiating conductor segments (12A) is a frame (34A).
The top (38A) of the shape supported by the tie bar (36A)
A first metal tape (32A) formed by continuously forming A)
And the other radiating conductor segment (12B) is
A second metal tape (32) in which a plurality of tops (38A) supported by tie bars (36B) are continuously formed in B).
B) is prepared, and the first dielectric layer half portion (14A) is integrally formed on the inner surface of one radiation conductor segment (12A) formed on the first metal tape (32A), After the second dielectric layer half part (14B) is integrally formed on the inner surface of the other radiation conductor segment (12B) formed on the metal tape (32B), the first dielectric layer half part (14A) is formed. And the second dielectric layer half (14
B) to connect two radiating conductor segments (12A, 12A
The tie bar (36A, 36B) supporting B) is cut, and at least one short-circuit terminal (20A) of the two radiating conductor segments (12A, 12B) is bent and formed at one end side. Antenna manufacturing method. 11. The method for manufacturing a folded antenna according to claim 3, wherein one of the radiation conductor segments (12A) is a frame (34A).
The top (38A) of the shape supported by the tie bar (36A)
A first metal tape (32A) formed by continuously forming A)
And the other radiating conductor segment (12B) is
A second metal tape (32) in which a plurality of tops (38A) supported by tie bars (36B) are continuously formed in B).
B) and a third metal tape (32C) formed by continuously forming a plurality of tops (38C) in which a parasitic conductor (46) is supported by a tie bar (36C) in a frame (34C). , A first dielectric layer half (14A) is integrally formed on the inner surface of one radiation conductor segment (12A) formed on the first metal tape (32A), and a second metal tape (32B) is formed. After integrally molding the second dielectric layer half (14B) on the inner surface of the other radiating conductor segment (12B) formed on the first dielectric layer segment (12B), the first dielectric layer half (14A) and the second dielectric layer half (14A) are formed. Half layer (14
B) is coupled with the parasitic conductor (46) formed on the third metal tape (32C) interposed therebetween to support the two radiating conductor segments (12A, 12B) and the parasitic conductor (46). Manufacture of a folded antenna, characterized in that a tie bar (36A, 36B, 36C) is cut, and at least one short-circuit terminal (20A) of two radiating conductor segments (12A, 12B) is bent and formed at one end side. Method. 12. A method of manufacturing a folded antenna according to claim 3, wherein one of the radiation conductor segments (12A) is a frame (34A).
The top (38A) of the shape supported by the tie bar (36A)
A first metal tape (32A) formed by continuously forming A)
And the other radiating conductor segment (12B) is
A second metal tape (32) in which a plurality of tops (38A) supported by tie bars (36B) are continuously formed in B).
B) and a third metal tape (32C) formed by continuously forming a plurality of tops (38C) in which a parasitic conductor (46) is supported by a tie bar (36C) in a frame (34C). A first dielectric layer portion (14P) is integrally molded on both surfaces or one surface of one radiation conductor segment (12A) formed on the first metal tape (32A), and the second metal tape (32
Parasitic conductor formed on the third metal tape (32C) by integrally molding the second dielectric layer portion (14Q) on one or both sides of the other radiation conductor segment (12B) formed on B) After integrally molding the third dielectric layer portion (14R) on both surfaces of (46), the first dielectric layer portion (14P) is formed on one surface of the third dielectric layer portion (14R). The second dielectric layer portion (14
Q) and connect two radiating conductor segments (12A, 12
B) and the tie bar (36A, which supports the parasitic conductor (46),
36B, 36C) are cut, and at one end side, at least one of the two radiating conductor segments (12A, 12B) for short-circuiting (20
A method of manufacturing a folded-type antenna, characterized in that A) is formed by bending.