JP2926332B1 - Antenna elements for mobile communication equipment - Google Patents

Abstract

To provide an antenna element which is ultra-small developed in a planar shape, has few restrictions on a use range and a mounting place, and can be directly connected to a circuit board. A substrate formed by processing an electrically insulating sheet of paper or synthetic resin into a vertically long shape, and a conductor made of a thin plate or foil symmetrically disposed on both sides of the substrate,
The conductor has a rhombic structure that shares one side of an equilateral triangle,
Assuming that the short diagonal line of this diamond-shaped structure is 1, the long diagonal line is route 3, and each bent corner is connected by a ridge line, and is flatly developed on both sides of the substrate so as to be a mirror object. X = horizontal axis, y = depth, z =
Assuming height, x = 1/8, y = 0, z = root 3 /
8 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna element for a mobile communication device such as a portable telephone.

[0002]

2. Description of the Related Art Dipole antennas and loop antennas are known as general antennas for televisions and radios. The present applicant has proposed a regular octahedral three-dimensional antenna element in Japanese Patent No. 1087058.

[0003]

However, this antenna element is an antenna element used for a mobile communication device such as a television, a radio or a portable telephone, and requires a certain space because of its three-dimensional shape. For this reason, the range of use and the mounting place are restricted, and the antenna becomes large for a portable device, which is inconvenient for a small communication device.

[0004] Further, since the terminal portion of the antenna element is not directly connected to the circuit board, one step is required for the mounting work, which requires much labor, and the work efficiency is reduced.

[0005] This three-dimensional antenna has to be formed by bending a metal rod or a metal wire three-dimensionally, and this operation is a manual operation, the efficiency of operation is not improved, and it is not suitable for mass production. .

The present invention solves these problems, and is an ultra-small antenna element which is developed into a planar shape, has less restrictions on a use range and a mounting place, and can be directly connected to a circuit board. It is intended to be provided.

[0007]

According to the present invention, an antenna element of a mobile communication device according to the present invention has a substrate formed by processing a vertically long sheet of an electrically insulating paper or a sheet made of synthetic resin, and symmetrically disposed on both sides of the substrate. It is composed of a thin plate or a conductor made of foil,
The conductor has a rhombic structure that shares one side of an equilateral triangle,
When a short diagonal line of the rhombus structure 1, a long diagonal line and Route 3, and in the footsteps of each bend corner at ridgeline, on both sides of the substrate, and planar development so as to mirror the target, dipole
When the antenna (1λ / 4) is set as a reference 1 , x = horizontal axis,
When y = depth and z = height, x = 1/8, y = 0,
z = (route 3) / 8 .

In the conductor, a wide connecting terminal portion which is directly connected to a circuit board of the device is formed slightly longer below the surface of the substrate, and a rising portion is formed continuously with the connecting terminal portion. A first inclined portion extending outward from the rising portion to near the one end face of the substrate, and extending from the first inclined portion along the one end face to a first upright ridge portion. And a second inclined portion extending from the first upright ridge portion to the top of the substrate is extended, and a top ridge portion is formed from the second inclined portion along the top of the substrate, and the top ridge is formed. A third inclined portion extending outward from the ridge line portion to the vicinity of the other end surface of the substrate is extended, and the third inclined portion is extended.
A second upright ridge portion is extended from the inclined portion along the other end surface of the base, and a fourth inclined portion extending from the second upright ridge portion to the lower center of the substrate is extended. The tip of the fourth inclined portion extends through the through hole formed in the substrate and extends to the back side surface of the substrate.
The second upright ridge, the third inclined portion, the top ridge, the second inclined portion, the first upright ridge, and the first inclined portion are sequentially mirror-symmetric with respect to the back side of the substrate. It is characterized by having been extended to.

According to the antenna element of the present invention, an induced power equivalent to that of a conventional three-dimensional antenna element can be induced, the directivity is excellent, and the manufacture is simple. Furthermore, since it is not only ultra-compact, but also a thin, flat, and flexible, it can be used regardless of a flat surface, a curved surface, or a surface shape with some unevenness. In addition, when the antenna element is installed on the device, the terminal portion can be easily fixed directly to the substrate by means such as welding or sticking.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a developed view showing one embodiment of the antenna element according to the present invention, FIG. 2 is a front view showing one embodiment of the antenna element according to the present invention, FIG. 3 is a rear view of FIG. 2, and FIG. 5 is a sectional view taken along the line AA of FIG. 5, FIG. 5 is a sectional view taken along the line BB of FIG. 2, and FIG. 6 is an explanatory view showing a use state of the antenna element according to the present invention.

The antenna element according to the present embodiment includes a substrate 1 formed of an electrically insulating paper or a rectangular sheet made of a synthetic resin, and a specific continuous shape portion which is spread over the substrate 1 and exerts an antenna effect. And a conductor 2 made of a thin copper plate or copper foil, for example, a copper strip element 2.

As shown in FIG. 1, the copper strip element 2 has, as a basic structure, a rhombus sharing one side of an equilateral triangle, and when a short diagonal line a of this rhombus structure is 1, a long diagonal line b
Becomes route 3. A copper strip element 2 is flatly developed on both sides of a substrate 1 as a mirror object, and a dipole antenna (1λ / 4) is used.
When quasi-one , x = horizontal axis, y = depth, and z = height, x = 1/8, y = 0, and z = (route 3) / 8 .

Specifically, the rhombus structure is formed by joining the bent corners c with the ridge lines d. By forming the ridge line d, one side becomes an octagon, and on the other hand, when the antenna elements are arranged in parallel, the corners c of the copper strip elements 2 are prevented from overlapping each other. The copper strip elements 2 having the rhombic structure of the copper strip elements 2 connected by the ridge line d form an octagon symmetrical to the left, right, up and down. A feature of the present invention is that a conventional three-dimensional antenna element is formed in a planar and mirror-symmetric octagon while maintaining its function. That is, in the planar antenna element according to the present invention, the apex angle of the triangle is an isosceles triangle of 60 °, and one side of the isosceles triangle having the same size is shared to form a rhombus structure. In this case, the two sets of opposing apex angles are 60 ° and 120 °, respectively. Therefore, in the diamond-shaped structure 2, if the short diagonal line a is 1, the long diagonal line b becomes the route 3. As described above, by changing the conventional three-dimensional antenna into a planar antenna, when the conventional three-dimensional antenna element has x = horizontal axis, y = depth, and z = height, x = 1/8 , Y = 1/8, z = (root
2) Whereas the antenna element having a planar shape according to the present invention has a single shape, whereas x = １ ／ and y =
0, z = (route 3) / 8 . In other words, based on the wavelength λ , the conventional antenna element has x = 1λ / 32, y = 1λ / 32, z = (route 2
λ) / 32 , whereas in the present invention, x = 1λ /
32, y = 0, z = (route 3) formed at λ / 32 . In this diamond-shaped structure, the bent corners 3 are connected by a ridgeline d, and a gap is provided to that extent to form an octagonal plane.

As shown in FIG. 2, the specific configuration of the octagonal flat attachment of the copper strip element 2 is as shown in FIG.
Then, a circuit board 31 of a communication device 30 described below is
The connection terminal portion 13 which is formed to be wide and directly connected to is formed to be slightly longer. When the width of the connection terminal portion 13 is set to 50Ω in connection with the impedance, the connectivity with the device is improved. Therefore, it is preferable that the width is approximately 2.6 mm. Its length is not particularly limited. This connection terminal 13
A rising portion 14 is formed continuously, and a first inclined portion 15 extending from the rising portion 14 toward the outside of the substrate 1 to near the one end face of the substrate 1 is extended. A first upright ridge line portion 16 extends from the first inclined portion 15 along one end surface of the substrate 1. A second inclined portion 17 extending from the first upright ridge portion 16 to the top of the substrate 1 is extended, and a top top ridge portion 18 is formed from the second inclined portion 17 along the top of the substrate 1. A third inclined portion 19 extending from the top ridge line portion 18 outward to near the other end surface of the substrate 1 is extended.
A second upright ridge line portion 20 is extended from the third inclined portion 19 along the other end surface of the substrate 1, and the second upright ridge line portion 20 is provided.
A fourth inclined portion 21 extending from the bottom to the lower center of the substrate 1 is extended, and a copper strip element 12 made of a thin copper plate or a copper foil is compacted on the front side 11a of the substrate 1.

As shown in FIG. 3, a through-hole W is formed in the back surface 12 of the substrate 1 to make the front and back conductive.
The through-hole W located at the tip of the extended fourth inclined portion 21 is made to penetrate and extend to the back side surface 12 of the substrate 1. Starting from this, the same track portion 2 as the fourth inclined portion 21 is used.
2, the same track portion 23 as the second upright ridge line portion 20, the same track portion 24 as the third inclined portion 19, the same track portion 25 as the top ridge line portion 18, the same track portion 26 as the second inclined portion 17, The copper strip element 2 is mounted on the substrate 1 with the same track part 27 as the first upright ridge line part 16, the same track part 28 as the first inclined part 15, and the same track as the copper strip element 2 on the front side 11 and the mirror surface sequentially. Mirror on back side 12
It extends symmetrically and crawls.

The method of forming the copper strip elements 2 on the front and back sides 11 and 12 of the substrate 1 is performed by a general method of forming the circuit board 1. For example, the front and back sides 1 of a small, vertically long rectangular substrate 1
A thin copper plate or copper foil is laid on the entire surface of 1, 12 in a mirror-symmetric manner in the above octagon, and a predetermined continuous shape portion is printed thereon with a printing ink obtained by dissolving a pigment in a longines-masonic acid solution. A so-called masking process, and then the exposed copper other than the printed portion is washed away with an etchant, leaving only the printed portion, and finally dissolving the printing ink to form a continuous mirror-symmetric octagonal copper strip element 2. To appear.

Next, the exposed portions of the copper on the front and back surfaces 12 and 13 of the rectangular substrate 1 are removed with an etching solution such as a ferric chloride solution, leaving only the printed portions. Next, the printing paint is wiped off with an ink release agent, for example, a 1 to 3% solution of caustic soda, to reveal a pattern of the copper strip element 2 as shown in FIGS.

The electrically insulating synthetic resin used as the substrate 1 in the present invention includes, for example, polyester resin, polytetrafluoroethylene resin, polyethylene resin and the like. In addition, examples of the metal conductor 2 that forms the continuous shape portion include copper and aluminum.
Examples of the conductor 2 made of a synthetic resin include a polyid resin containing carbon fiber, a polycarbonate resin, and an ABS resin.

As shown in FIG. 6, the connection terminal portion 13 of the antenna element based on the above configuration is formed to be wide and slightly long, so that the connection terminal portion 13 is directly welded / attached to the circuit board 31 of the communication device 30 or the like. And functions as an antenna for mobile communication. In the antenna element of the present invention, the width of the connection terminal portion 13 is preferably about 2.6 mm, but the length is slightly longer and is not limited.

This antenna element is octagonal, is a single piece formed in a mirror-like plane on a substrate, and is small in size.
It can be used regardless of the location of the equipment to be installed.

As described above, the antenna element of the present invention can induce induced power equivalent to that of a conventional three-dimensional antenna element, has excellent directivity, and is easy to manufacture. That is, when a metal rod having a length of 1/4 of the wavelength is used as an antenna element, the conductor of the present invention is formed into an octagonal mirror-like structure, so that 1/32,
(Route 3) Equal to the plane of wavelength / 32 . Furthermore, since it is not only ultra-compact, but also a thin, flat, and flexible, it can be used regardless of a flat surface, a curved surface, or a surface shape with some unevenness. For installation, the terminal portion can be easily fixed directly to the substrate by welding or sticking.

In this embodiment, the antenna element for mobile communication has been described. However, the present invention is not limited to this, and it can be used for a television or a radio.

Next, the measurement results of the antenna element of the present invention will be described with reference to the drawings. Frequency 1800-1900MH
FIGS. 7 to 9 show the results of measuring the performance of the planar antenna element of the present example near Z. FIG. 7 shows the result of measuring the return loss. FIG. 8 shows the result of measuring the Smith chart. FIG. 9 shows the result of measuring the SWR. FIG.
As shown in the measurement results of Nos. To 9, it is clear that the antenna element of the present invention has excellent impedance characteristics.

In this embodiment, the shape of the antenna element is formed on the rectangular substrate 1 by printing or etching as described above, but photolithography may be used in addition to this method. , Or by vapor deposition, and by cutting a thin copper plate into the shape described above,
You may make it adhere to the rectangular substrate 1 with an adhesive.

[0025]

As described above, the antenna element for a mobile communication body according to the present invention has a regular octagonal shape in which a thin copper plate or copper foil is laid on the front and back surfaces of a substrate made of a small rectangular sheet in a strip shape. Since it has a planar configuration in which a shaped element is formed, it is a very small antenna element. There are very few restrictions on the mounting location as compared with the conventional one, and it can be mounted on mobile communication equipment.

Further, in the antenna element of the present invention, the connection terminal portion of the antenna element is directly connected to the circuit board 31 of the device, so that the mounting work is not complicated.

Further, the antenna element according to the present invention induces a high induced electromotive force equivalent to that of the conventional three-dimensional antenna element, has excellent directivity characteristics and wide-range characteristics, and is simple in construction and manufacture. Since there are very few restrictions on the mounting location as compared with the conventional one, it has a very wide range of applications.

[Brief description of the drawings]

FIG. 1 is a development view showing an embodiment of an antenna element according to the present invention,

FIG. 2 is a front view showing an embodiment of the antenna element according to the present invention,

FIG. 3 is a rear view of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is an explanatory diagram showing a use state of the antenna element according to the present invention.

FIG. 7 is a graph showing measurement results of return loss of the antenna element according to the present invention.

FIG. 8 is a graph showing Smith chart measurement results of the antenna element according to the present invention.

FIG. 9 is a graph showing SWR measurement results of the antenna element according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Conductor 3 ... Bending corner part 11 ... Front side 12 ... Back side 13 ... Connection terminal part 14 ... Rising part 15 ... First inclined part 16 ... First upright ridge line part 17 ... Second inclination Part 18: Top ridge line part 19: Third inclined part 20 ... Second upright ridge line part 21 ... Fourth inclined part 22 ... Sloped part 23 ... Upright ridge line part 24 ... Sloped part 25 ... Vertex ridge line track part 26 ... Inclined portion 27 ... Upright ridgeline portion 28 ... Inclined portion 30 ... Communication equipment 31 ... Circuit board W ... Through hole

Claims (2)

(57) [Claims] 1. A substrate formed by processing a vertically long sheet of an electrically insulating paper or a sheet made of synthetic resin, and a conductor made of a thin plate or a foil symmetrically disposed on both sides of the substrate. Assuming a rhombus structure in which one side of an equilateral triangle is shared, and a short diagonal line of the rhombus structure is 1, a long diagonal line is a route 3 and each bent corner is connected by a ridge line, and mirrored on both surfaces of the substrate. so as to be developed into a flat, dipole
Ruantena (1 [lambda / 4) when the reference 1, when x = horizontal axis, y = depth, and z = height, x = 1/8, y =
An antenna element for a mobile communication device, wherein the antenna element is formed at 0, z = (route 3) / 8 . 2. The method according to claim 1, wherein the conductor is located below the substrate surface side.
A wide connecting terminal part that is directly connected to the circuit board of the device is formed slightly longer, a rising part is formed continuously to the connecting terminal part, and one side of the board is directed outward from the rising part. A first inclined portion extending to near the end surface is extended, a first upright ridge portion is extended from the first inclined portion along the one side end surface, and a substrate top portion is extended from the first upright ridge portion. A second sloping portion extending from the second sloping portion is formed along the top of the substrate from the second sloping portion, and extends outward from the top ridge to the vicinity of the other end surface of the substrate toward the outside. Extend a third ramp,
A second upright ridge is extended from the third inclined portion along the other end surface of the base, and a fourth inclined portion extending from the second upright ridge to the lower center of the substrate is extended. The tip of the fourth inclined portion provided extends through the through hole formed in the substrate to extend to the back side surface of the substrate, and the fourth inclined portion and the second upright ridge line are used as starting points. Department,
The third inclined portion, the top ridge line portion, the second inclined portion, the first upright ridge line portion, and the first inclined portion are sequentially and mirror-symmetrically extended on the rear surface side of the substrate along the same track. The antenna element for a mobile communication device according to claim 1.