JP6826318B2 - Antenna device - Google Patents

Description

The present invention relates to an antenna device whose directivity can be flexibly adjusted.

In recent years, wireless communication devices have come to be used not only in mobile phones and notebook personal computers with built-in wireless communication functions but also in various fields, and there is a demand for their thinness and miniaturization. With such a demand, the formation area and arrangement of the mounted antenna device are limited, and it is often difficult to obtain the directivity in the required direction.

Therefore, conventionally, a technique of providing two antennas on one substrate has been studied. For example, Patent Document 1 describes a diversity antenna device in which two chip antennas are arranged on a circuit board with a space. In this diversity antenna device, each chip antenna is the length of the chip antenna with respect to the length (Ls) of the circuit board at the corner of the circuit board in the direction in which the first chip antenna and the second chip antenna face each other. The ratio (La / Ls) of the lengths (La) in the direction is set to 1/10 to 2/5, and the length h from the short side of the circuit board is arranged so as to be about 1/10 of the Ls. I have to.

Further, in Patent Document 2, two paired antennas are arranged on a substrate with an interval, and when each antenna is excited by an electric field of the same phase, the center line in the longitudinal direction of the substrate is set as the center line of the substrate in the in-phase side direction direction. , A diversity antenna device is described in which the center line in the lateral direction of the substrate is set as the center line of the substrate in the opposite phase side direction when the electric field in the opposite phase is excited.

However, in Patent Document 1, it is necessary to control the resonance current that excites the circuit board by adjusting the length of the chip antenna and the length of the circuit board, respectively, and the antenna design, the circuit board design, the board size, etc. , There is no freedom in each design, and it is difficult to flexibly adjust the desired directivity. Further, since the longitudinal direction of each chip antenna is orthogonal to the longitudinal direction of the module, the main directivity direction is limited to the direction orthogonal to the chip antenna (longitudinal direction of the substrate), and the desired directivity direction is obtained. It is difficult to flexibly adjust the sex.
Further, each chip antenna has a radiation electrode and a ground electrode that excite at λ / 2 or λ / 4 with respect to the wavelength (λ) of the transmission / reception frequency, and the ground electrode is on one side in the longitudinal direction of the circuit board. Since it is arranged so as to face it, it is difficult to flow a resonance current that excites the inside of the circuit board in a desired direction due to the influence of the antenna installation state, the circuit board, the surrounding GND arrangement, etc. It is difficult to flexibly adjust the desired orientation.
Further, Patent Document 1 also describes an example in which two chip antennas installed near one side of a circuit board are installed in directions orthogonal to each other and are parallel or orthogonal to the one side of the circuit board. However, since the radiation from one chip antenna interferes with the other, there is a disadvantage that the directivity is limited in the longitudinal direction of the circuit board in this case as well.

Further, in Patent Document 2, the antenna performance, particularly the directivity direction, is affected by the substrate size and the substrate shape, which limits the degree of freedom in design and makes the antenna performance including the desired directivity flexible. It is difficult to achieve. Furthermore, a phase switcher is required, and complexity, frequency adjustment, and impedance adjustment may be difficult due to the influence of the distance between each antenna and the occupied area of the antenna, and it is desired due to interference between the antennas. It is difficult to flexibly realize the diversity effect.

Therefore, in order to flexibly realize the desired directivity and diversity effect, the antenna device described in Patent Document 3 has been developed. In this antenna device, the end sides of the ground planes arranged on the base end side of the pair of antenna elements extend in different directions with respect to one, and at least one of them extends with respect to the end side of the substrate body. Because the radiation of the pair of antenna elements does not interfere with each other, the radiation pattern between each antenna is tilted according to the tilted angle, and the desired directivity can be obtained and a flexible diversity effect can be realized. is there.

Japanese Patent No. 3997517 Japanese Unexamined Patent Publication No. 2004-282136 Japanese Patent No. 6004173

However, even in the above-mentioned conventional technique, the following problems remain.
Further improvement in antenna performance is required in an antenna occupied area similar to the antenna device of Patent Document 3. That is, in the antenna device of Patent Document 3, a pair of corners at both ends of the end side of the substrate body is regarded as an antenna occupying area, but a wider bandwidth and higher radiation efficiency can be obtained in the same corner area. There is a demand for an antenna device that can be used.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an antenna device capable of flexibly realizing desired directivity and diversity effect, and obtaining a wider bandwidth and higher radiation efficiency. To do.

The present invention has adopted the following configuration in order to solve the above problems. That is, the antenna device according to the first invention is described on the substrate body as an insulating substrate body, a ground surface in which the substrate body is patterned with a metal foil, and a region in which the ground surface is not formed. A pair of antenna occupying areas arranged on one end side of the substrate body with a part of the ground surface sandwiched between them, and a pattern formed with a metal foil in the pair of antenna occupying areas and arranged in the vicinity of the ground surface. A pair of antenna elements each having a feeding point on the base end side are provided, and the antenna element extends in a direction in which at least a part of the base end side is orthogonal to the end edge of the ground surface near the feeding point. A passive element is connected to a portion extending in the orthogonal direction, and an antenna element of a dielectric antenna extending in a direction along the end edge of the ground surface is connected to the tip side. The end side of the ground surface arranged on the base end side of the antenna element extends in a different direction with respect to one, and at least one is inclined with respect to the end side of the substrate body. The pair of antenna occupying areas are provided at a pair of corners at both ends of the end side of the substrate body, and the antenna elements of the pair of antenna elements have their tips directed to opposite sides. A first additional extending portion extending from the tip of the antenna element toward the corner of the corner portion is provided so that the tip extends toward the side opposite to the end side of the substrate main body. It is characterized by being.

In this antenna device, since the antenna element includes a first additional extending portion extending from the tip of the antenna element toward the corner of the corner, the antenna element floats between the first additional extending portion and the antenna element. It is possible to generate capacitance, and it is possible to achieve wide bandwidth and high radiation efficiency. In addition, the antenna element can be arranged up to the immediate vicinity of the corner, and the antenna element can radiate to the maximum extent. Further, by effectively using the area between the antenna element and the corner of the corner as the pattern addition area of the antenna element, it is possible to improve the antenna performance while maintaining the same antenna occupancy area as the conventional one.

In the first invention, the antenna device according to the second invention is a second additional extending portion in which the antenna element extends from the tip of the first additional extending portion along the end edge of the substrate main body. It is characterized by having.
That is, in this antenna device, since the antenna element includes the second additional extension portion extending from the tip of the first additional extension portion along the end edge of the substrate main body, the antenna element is referred to as the second additional extension portion. Stray capacitance is also generated between the antenna element and the open end of the antenna element, and there is no part parallel to the antenna element in the path, and the stray capacitance between the open end with high impedance and the feeding side of the antenna element. Can be effectively used, and the impedance of the entire antenna can be increased.

The antenna device according to the third invention is characterized in that, in the second invention, the second additional extending portion extends to the vicinity of the proximal end of the antenna element.
That is, in this antenna device, since the second additional extension portion extends to the vicinity of the base end of the antenna element, the stray capacitance between the open end of the second additional extension portion and the antenna element feeding side is increased. It can be generated effectively.

According to the present invention, the following effects are obtained.
According to the antenna device of the present invention, since the first additional extending portion extending from the tip of the antenna element toward the corner of the corner is provided, the antenna device floats between the first additional extending portion and the antenna element. It is possible to generate capacitance, and it is possible to achieve wide bandwidth and high radiation efficiency. In addition, the antenna element can be arranged up to the immediate vicinity of the corner, and the antenna element can radiate to the maximum extent.
Therefore, according to the present invention, it is possible to obtain an antenna device having higher antenna performance in the same corner region as the conventional one.

It is a top view which shows one Embodiment of the antenna device which concerns on this invention. In this embodiment, it is an enlarged wiring diagram of a main part showing an antenna device. In this embodiment, it is a perspective view (a), a plan view (b), a front view (c), and a bottom view (d) showing an antenna element. In this embodiment, it is explanatory drawing for showing the stray capacitance generated by the 1st additional extension part and the 2nd additional extension part. In this embodiment, it is explanatory drawing which shows the transition image of a radiation pattern. It is a graph which shows VSWR characteristic of a pair of antenna elements in the Example of the antenna device which concerns on this invention. It is a graph which shows VSWR characteristic in the Example and the conventional example of the antenna device which concerns on this invention. It is a graph which shows the radiation efficiency characteristic in the Example and the conventional example of the antenna device which concerns on this invention. It is a graph which shows the radiation pattern of a pair of antenna elements in the Example of this invention. It is a wiring diagram which shows one antenna element which shows the other embodiment of the antenna device which concerns on this invention.

Hereinafter, an embodiment of the antenna device according to the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIGS. 1 and 2, the antenna device 1 in the present embodiment has a rectangular insulating substrate body 2 and a ground surface GND having a pattern formed on the substrate body 2 with a metal foil such as copper foil. And a pair of antenna occupying areas OP1 and OP2 arranged on one end side 2a side of the board body 2 with a part of the ground surface GND sandwiched on the board body 2 as a region where the ground surface GND is not formed. A pair of antenna elements 3A and 3B are provided in which a pattern is formed of a metal foil such as a copper foil in the pair of antenna occupied areas OP1 and OP2 and a feeding point FP is provided on the base end side arranged near the ground surface GND. There is.

At least a part of the antenna elements 3A and 3B on the base end side extends in a direction orthogonal to the end sides G1 and G2 of the ground surface GND near the feeding point FP, and extends in the orthogonal direction. Two first passive elements P1a and P1b are connected to the antenna elements P1a and P1b, and antenna elements AT1 and AT2 of a dielectric antenna extending in a direction along the end sides G1 and G2 of the ground surface GND are connected to the tip side. .. That is, the antenna elements AT1 and AT2 are arranged parallel to the end sides G1 and G2 of the ground surfaces GND facing each other.

Further, the end sides G1 and G2 of the ground surface GND arranged on the base end side of the pair of antenna elements 3A and 3B extend in different directions with respect to one, and at least one of them is the substrate main body 2. It is inclined with respect to the end side 2a.
The pair of antenna occupied areas OP1 and OP2 are provided on a pair of corner portions CN at both ends of the end sides 2a of the substrate main body 2.
The antenna elements AT1 and AT2 of the pair of antenna elements 3A and 3B extend so that the tips are directed to the opposite sides of each other and the tips are directed to the opposite sides of the end side 2a of the substrate main body 2.

Further, the antenna elements 3A and 3B include a first additional extending portion E1 extending from the tips of the antenna elements AT1 and AT2 toward the corner CN1 of the corner portion CN.
Further, the antenna elements 3A and 3B include a second additional extending portion E2 extending from the tip of the first additional extending portion E1 along the end side 2a of the substrate main body 2.
The second additional extending portion E2 extends to the vicinity of the proximal ends of the antenna elements AT1 and AT2.

Further, the antenna elements AT1 and AT2 of the pair of antenna elements 3A and 3B extend so as to face opposite to each other.
Further, the end sides G1 and G2 of the ground surface GND arranged on the base end side of the pair of antenna elements 3A and 3B extend in different directions with respect to one, and at least one of them is the substrate main body 2. It is inclined with respect to the end side 2a. That is, at least one of the end sides G1 and G2 of the ground surface GND extends at an angle of more than 0 ° and less than 90 ° in absolute value with respect to the end side 2a of the substrate main body 2.

In the present embodiment, as shown in FIG. 2, the end sides G1 and G2 of the ground plane GND arranged on the base end side of the pair of antenna elements 3A and 3B are in the direction orthogonal to the end side 2a of the substrate main body 2. On the other hand, it extends at an inclination of 45 ° and −45 °. That is, the end sides G1 and G2 of each ground surface GND extend diagonally with respect to the longitudinal direction of the substrate main body 2, and the end sides G1 of the ground surface GND arranged on the base end side of the antenna element 3A and the substrate main body. The angle θ with respect to the longitudinal direction of 2 is set to 45 °, and the angle θ between the end side G2 of the ground surface GND arranged on the base end side of the antenna element 3B and the longitudinal direction of the substrate body 2 is −45 °. Is set to. The absolute values of the angles of the ends G1 and G2 of the ground surface GND are set to be the same as described above so as to complement the directions and polarizations that are weak to each other, but the desired diversity effect is obtained. The angles of the end sides G1 and G2 of the ground surface GND do not have to be the same depending on the conditions of.

The antenna elements 3A and 3B have a ground connection extending portion 3a connected to the ground surface GND at a position where one end is connected in the middle of the base end side and the other end is separated from the feeding point FP. A second passive element P2 for impedance adjustment is connected to 3a.
Further, the ground connection extending portions 3a of the pair of antenna elements 3A and 3B are arranged so as to face each other inward.

The substrate main body 2 is a general printed circuit board, and in the present embodiment, the main body of the printed circuit board made of a rectangular glass epoxy resin or the like is adopted.
The pair of antenna occupying regions OP1 and OP2 are a pair of corner portions CN at both ends of the same end side 2a of the substrate main body 2, and are provided in a shape in which the ground surface GND is cut out in a triangular shape. Further, the end sides G1 and G2 of the ground plane GND in contact with the respective antenna occupied areas OP1 and OP2 extend in directions orthogonal to each other.
An RF circuit component mounting area can be provided on the ground surface GND, and a plurality of components can be mounted.

The antenna elements 3A and 3B extend from the feeding point FP to one end (base end) of the antenna elements AT1 and AT2 in the direction perpendicular to the end sides G1 and G2 of the ground surface GND. It has E0. The first passive elements P1a and P1b are connected to the proximal end extending portion E0.
Further, the antenna elements 3A and 3B have a land portion 3b for mounting the other ends of the antenna elements AT1 and AT2.
For example, a core wire of a coaxial cable (not shown) connected to a high frequency circuit is connected to the feeding point FP, and the ground wire of the coaxial cable is connected to a ground surface GND in the vicinity.

For the first passive elements P1a and P1b and the second passive element P2, for example, an inductor, a capacitor or a resistor is adopted. In this embodiment, the two first passive elements P1a and P1b are connected in series.
The antenna elements AT1 and AT2 are loading elements that do not self-resonate at a desired resonance frequency. For example, as shown in FIG. 3, a chip in which a conductor pattern 22 such as Ag is formed on the surface of a dielectric 21 such as ceramics. It is an antenna.

The distance a between the antenna elements AT1 and AT2 shown in FIG. 4 and the ground surface GND is set to λ / 16 (1/16 wavelength) or less, where λ is the wavelength corresponding to the resonance frequency.
In the case of the embodiment of the present invention, the ground surface GND does not overlap between the feeding point FP and the antenna elements AT1 and AT2, and the antenna elements 3A and 3B are provided between them, and the end sides G1 in which the ground surface GND is cut are provided. Since at least a part of the antenna elements 3A and 3B is arranged perpendicular to G2, there is at least one part in the antenna elements 3A and 3B that is not affected by the ground surface GND, and the first part is the first part. By providing the passive elements P1a and P1b, the electrical length thereof can be controlled and the resonance frequency can be flexibly adjusted.

Further, the antenna elements AT1 and AT2 are loading elements that do not self-resonate with respect to a desired resonance frequency, and by combining these, the influence of the distance between the antenna elements AT1 and AT2 and the ground surface GND can be reduced. It will be possible.
Therefore, of course, it is desirable that the distance a between the antenna elements AT1 and AT2 and the ground surface GND is separated, but in the embodiment of the present invention, even if the distance a is λ / 16 or less, the decrease in antenna gain is small. High performance can be achieved. As a result, it is possible to realize both miniaturization of the antenna occupied areas OP1 and OP2 and at the same time high performance.

The distance between the pair of feeding points FP is preferably set to λ / 4 (1/4 wavelength) or less. That is, since the ground surface GND is interposed between the antenna occupied areas OP1 and OP2, there is little interference between the antennas, and even if the distance between the feeding points is a quarter wavelength or less, high performance can be realized. Become.

In the antenna device 1 of the present embodiment, the end sides G1 and G2 of the ground surface GND arranged on the base end side of the pair of antenna elements 3A and 3B extend in different directions with respect to one. Since at least one of them is inclined with respect to the end side 2a of the substrate main body 2, the radiations of the pair of antenna elements 3A and 3B do not interfere with each other, and as shown in FIG. 5, between the antennas according to the inclined angle. The radiation pattern of the antenna is tilted, the desired directivity can be obtained, and a flexible diversity effect can be realized.

Further, the end sides G1 and G2 of the ground surface GND arranged on the base end side of the pair of antenna elements 3A and 3B are at 45 ° and −45 ° with respect to the direction orthogonal to the end side 2a of the substrate main body 2. Since it is inclined and extends, it is possible to complement each other with weak directions and polarizations between a pair of antennas, and to obtain characteristics close to isotropic.
Further, since the antenna elements AT1 and AT2 of the pair of antenna elements 3A and 3B extend on opposite sides of each other, that is, with their tips facing outwards, as compared with the case where the antenna elements AT1 and AT2 are arranged with their tips facing inward. It is hard to interfere and good antenna characteristics can be obtained.

The first additional extension portion E1 and the second additional extension portion E2 function as open loading elements that generate stray capacitance between the antenna elements AT1 and AT2.
That is, as shown in FIG. 4, a stray capacitance C1 is generated between the first additional extension portion E1 and the antenna elements AT1 and AT2, and the second additional extension portion E2 and the antenna elements AT1 and AT2 A stray capacitance C2 is generated between them. Further, a stray capacitance C3 is also generated between the second additional extension portion E2 and the feeding side base end portion and the base end side land portion 3b of the antenna elements AT1 and AT2.

As described above, in the antenna device 1 of the present embodiment, the antenna elements 3A and 3B include the first additional extending portion E1 extending from the tips of the antenna elements AT1 and AT2 toward the corner CN1 of the corner portion CN. Therefore, a stray capacitance can be generated between the first additional extension portion E1 and the antenna elements AT1 and AT2, and a wide band and high radiation efficiency can be achieved. Further, the antenna elements 3A and 3B can be arranged up to the immediate vicinity of the corner CN1 of the corner portion CN, and the antenna elements 3A and 3B can radiate to the maximum extent. Further, by effectively using the area between the antenna elements AT1 and AT2 and the corner CN1 of the corner CN1 as the pattern addition area of the antenna elements 3A and 3B, the antenna performance remains the same as the conventional antenna occupied areas OP1 and OP2. Can be improved.

Further, since the antenna elements 3A and 3B include the second additional extension portion E2 extending from the tip of the first additional extension portion E1 along the end side 2a of the substrate main body 2, the second additional extension portion E2 is provided. A stray capacitance is also generated between the part E2 and the antenna elements AT1 and AT2, and there is no portion parallel to the antenna elements AT1 and AT2 in the path to the open ends of the antenna elements 3A and 3B, so that the impedance is increased. The stray capacitance C3 between the high open end and the antenna elements AT1 and AT2 feeding side can be effectively used, and the impedance of the entire antenna can be increased. In particular, since the second additional extension portion E2 extends to the vicinity of the base end of the antenna elements AT1 and AT2, the open end of the second additional extension portion E2 and the antenna element AT1 and AT2 feeding side are suspended. The capacitance C3 can be generated more effectively.

Next, in the example produced based on the antenna device of the above embodiment, the results of measuring the VSWR characteristics, the radiation efficiency characteristics, and the radiation pattern will be described with reference to FIGS. 6 and 9.

The antenna device of this embodiment has a substrate body size of 85 × 70 mm.
Further, as each passive element, the first passive element P1a is an inductor of 8.2 nH, and the first passive element P1b is an inductor of 33.0 nH. The second passive element P2 is an 8.2 nH inductor.
Further, the direction toward the antenna occupied area side in the longitudinal direction of the board body 2 is the X direction, and the antenna occupied area OP2 to the antenna occupied area OP1 are oriented along the end sides 2a on the antenna occupied area OP1 and OP2 side of the board body 2. The direction toward the surface was defined as the Y direction, and the direction perpendicular to the surface of the substrate body 2 was defined as the Z direction. The power gain with respect to the XY plane at this time was measured.

As shown in FIG. 6, as can be seen from the VSWR characteristics of one antenna element 3A and the VSWR characteristics of the other antenna element 3B, both antennas realize good antenna characteristics. In the figure, the antenna element 3A is described as "antenna # A", and the antenna element 3B is described as "antenna # B".
The antenna element 3A had a center frequency of 920 MHz and a bandwidth of VSWR = 3 or less of 80.8 MHz. Further, the antenna element 3B had a center frequency of 920 MHz and a bandwidth of VSWR = 3 or less of 79.9 MHz.

Further, the VSWR characteristics investigated for the antenna device 1 of the present embodiment having the open loading elements of the first additional extending portion E1 and the second additional extending portion E2 and the conventional antenna device having no open loading element were examined. Together, it is shown in FIG. In the figure, the antenna device 1 of this embodiment is described as "open loading element: yes", and the conventional antenna device without the open loading element is described as "open loading element: none".
As shown in FIG. 7, in the antenna device 1 of the present embodiment, due to the effect of the open loading element, the bandwidth is improved by 20% or more in the antenna occupied areas OP1 and OP2 having the same area as compared with the conventional case without the open loading element. ing.

Next, the radiation efficiency characteristics of the antenna device 1 of the present embodiment having the open loading elements of the first additional extending portion E1 and the second additional extending portion E2 and the conventional antenna device having no open loading element were investigated. Are also shown in FIG.
As shown in FIG. 8, the antenna device 1 of the present embodiment has a center frequency of 920 MHz and a radiation efficiency of -3.3 dB, and the conventional antenna device has a center frequency of 920 MHz and a radiation efficiency of -4.8 dB. there were.
Therefore, in the antenna device 1 of the present embodiment, the radiation efficiency is improved by 1.5 dB or more in the antenna occupied areas OP1 and OP2 having the same area as compared with the conventional case in which the open loaded element is not provided due to the effect of the open loaded element.

Further, as can be seen from the radiation characteristics of one antenna element 3A shown in FIG. 9A and the radiation characteristics of the other antenna element 3B shown in FIG. 9B, the two antennas are in a direction of weak sensitivity. -It is possible to complement each other's polarizations and obtain sensitivity close to isotropic, and it is possible to realize effective characteristics for the diversity method.

The present invention is not limited to the above-described embodiment and the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the antenna element has a proximal end extending portion E0 extending in a direction perpendicular to the end edge of the ground surface from the feeding point, but the proximal end side extending portion E0 is at least one. It suffices if the portions are arranged vertically. For example, as another example of the embodiment, as shown in FIG. 10, the base end side extending portion E0 of the antenna element 33 is at an angle of 45 ° from the feeding point FP to the end sides G1 and G2 of the ground surface GND. An obliquely extending portion 33a extending in the direction and a vertically extending portion 33b extending in a direction perpendicular to the end sides G1 and G2 of the ground surface GND may be provided.

In this way, at least a part (vertical extending portion 33b) of the base end side extending portion E0 of the antenna element 33 extends in the vertical direction from the end sides G1 and G2 of the ground surface GND, so that the ground surface GND A portion orthogonal to the end sides G1 and G2 and the antenna element AT is generated, which makes it possible to reduce interference and improve the bandwidth and performance.
Further, in the above embodiment, the same antenna element and the passive element having the same constant are adopted in the pair of antenna elements, but different antenna elements and passive elements may be adopted depending on the conditions.

1 ... Antenna device, 2 ... Board body, 2a ... Edges of board body, 3A, 3B, 33 ... Antenna element, 3a ... Ground connection extension, AT1, AT2 ... Antenna element, CN ... Corner, CN1 ... Corner Corner of part, E1 ... 1st additional extension part, E2 ... 2nd additional extension part, FP ... Feed point, GND ... Ground surface, G1, G2 ... Edge of ground surface, P1a, P1b ... 1st passive element , P2 ... 2nd passive element

Claims (3)

Insulating board body and
A ground surface with a metal foil pattern formed on the substrate body,
As a region in which the ground surface is not formed, a pair of antenna occupying regions arranged on one end side side of the substrate main body with a part of the ground surface sandwiched on the substrate main body.
It is provided with a pair of antenna elements in which a pattern is formed of a metal foil in the pair of antenna occupied areas and feeding points are provided on the base end side arranged near the ground surface.
The antenna element extends in a direction in which at least a part on the base end side is orthogonal to the end edge of the ground surface near the feeding point, and the passive element is connected to the portion extending in the orthogonal direction. At the same time, the antenna element of the dielectric antenna extending in the direction along the end edge of the ground surface is connected to the tip side.
The end edges of the ground surface arranged on the base end side of the pair of antenna elements extend in different directions with respect to one, and at least one is inclined with respect to the end edge of the substrate body. And
A pair of the antenna occupied areas are provided at a pair of corners at both ends of the end side of the substrate body.
The antenna elements of the pair of antenna elements extend so that the tips are directed to the opposite sides of each other and the tips are directed to the opposite sides of the substrate body.
The antenna element comprises a first additional extension that extends in the region between the antenna element and the corner of the corner that is closer to the antenna element .
An antenna device characterized in that the first additional extending portion extends from the tip of the antenna element toward the corner of the corner portion closer to the antenna element to the immediate vicinity of the corner of the corner portion. .. In the antenna device according to claim 1,
A second additional extension portion extending from the tip of the first additional extension portion along the end side of the substrate main body is provided.
An antenna device characterized in that the first additional extending portion and the second additional extending portion do not have a portion parallel to the antenna element in the path thereof . In the antenna device according to claim 2,
An antenna device characterized in that the second additional extending portion extends to the vicinity of the proximal end of the antenna element.