JP4973562B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device, and more particularly to a conductor pattern shape of a surface mount antenna.

  A small wireless communication device such as a cellular phone has a small antenna device (see, for example, Patent Document 1). FIG. 11 is a schematic perspective view showing an example of the configuration of a conventional antenna device.

  An antenna device 50 shown in FIG. 11 includes a base 51 made of a rectangular parallelepiped dielectric and conductor patterns formed on each surface of the base 51. The conductor pattern includes an upper surface conductor portion 52 formed on the entire upper surface of the base body 51, side conductor portions 53 to 55 formed on side surfaces orthogonal to the longitudinal direction of the base body 11, and terminal electrodes formed on the bottom surface of the base body 51. 56 to 58, and the upper conductor portion 52 and the side conductor portions 53 to 55 constitute a radiation conductor of the antenna. One end of the side conductor portion 53 is connected to the terminal electrode 56 via the gap 59 and the side conductor portion 54, and power is supplied from a power supply line (not shown) connected to the terminal electrode 56. Thus, since the radiation conductor is fed through capacitive coupling by the gap 59, it can be excited without contact with the feed line, and impedance matching is easy even when the size is reduced.

The gap 59 is provided at a position close to the mounting surface. When the gap 59 is near the center of the base 51 in the height direction, the distance from the gap 59 to the upper conductor portion 52 and the distance from the gap 59 to the terminal electrode 53 are increased, and the side conductor portion 53 and the terminal electrode 56 are increased. And the load capacity composed of the side conductor portion 54 and the top conductor portion 52 both become small, whereas when the gap 59 is close to the top surface of the base 51, the side surface The load capacity formed by the conductor portion 54 and the upper surface conductor portion 52 can be increased, and when the gap 59 is brought closer to the bottom surface of the base body 51, the side surface conductor portion 53 and the terminal electrode 56 are formed. The load capacity can be increased. In other words, it is possible to increase the load capacity between two conductor patterns that are close to each other, thereby reducing the resonance frequency of the antenna. Furthermore, in order to make the area of the radiation conductor as large as possible, it is better to make the area of the first side conductor portion 53 directly connected to the upper surface conductor portion 52 as large as possible. It is provided at a close position.
Japanese Patent No. 3331852

  Generally, a radiation conductor of an antenna device is formed by screen-printing a conductive paste such as silver on a flat surface of a substrate. However, since the accuracy of screen printing is not so high, the printing position of the radiation conductor is shifted. There is a case. In particular, since screen printing is performed for each surface, it is very difficult to accurately align the conductor portion at the corner of the base where the two side surfaces intersect. The operating frequency of the antenna device is very sensitive to changes in the shape and position of the radiating conductor, so even if the printed position of the radiating conductor is slightly shifted, the operating frequency of the antenna changes, and the desired radiation characteristics There is a problem that you can not get.

  In particular, when the gap 59 is provided at a position close to the mounting surface in order to obtain a large load capacity, the resonance frequency fluctuates greatly only by slightly moving the position of the gap 59 due to a slight pattern shift such as a print shift. There is a problem of end up. In order to suppress this variation, a method of separating the position of the gap from the mounting surface is also conceivable. This can reduce the variation of the resonance frequency, but there is a problem that a sufficient load capacity cannot be obtained.

  The present invention solves the above-described problems, and the object of the present invention is to hardly affect the radiation characteristics even when printing misalignment occurs during electrode formation, and to obtain a large load capacity, and to achieve a resonance frequency. An object of the present invention is to provide an antenna device that can be set lower.

  In order to solve the above problems, an antenna device according to the present invention includes a base, a top conductor formed on the top surface of the base, a terminal electrode formed on the bottom surface of the base, and a side conductor formed on the side surface of the base. A first side conductor portion connected to one end of the substrate, and a second side conductor portion formed on the side surface of the base body together with the first side conductor portion and connected to one end of the terminal electrode. The two side conductor portions have a concavo-convex shape that meshes with each other through a gap, and the first side conductor portion has a first side that is parallel and closest to the lower side of the side surface, and the second side conductor The portion has a second side that is parallel and closest to the upper side of the side surface, and the distance from the first side to the lower side is substantially equal to the distance from the second side to the upper side. is there.

  According to the present invention, even if the printing of the first and second side conductor portions is shifted in the vertical direction, the capacitive coupling portion between the first side conductor portion and the terminal electrode formed on the bottom surface of the base body. The partial fluctuations between the second fluctuation and the capacitive coupling between the second side conductor part and the upper conductor part formed on the upper surface of the base body are offset, so that a constant load capacity is maintained as a whole. Can do. Therefore, even if printing misalignment occurs during electrode formation, radiation characteristics are hardly affected, and a large load capacity can be obtained.

  In the present specification, the bottom surface of the substrate is a mounting surface of the substrate in contact with the mounting substrate, and the upper surface of the substrate is a surface facing the bottom surface of the substrate. The upper side of the side of the base is a side common to the top and side of the base among the plurality of sides constituting the side of the base, and the lower side of the side of the base is the bottom and side of the base. It is a common side.

  In the present invention, it is preferable that the sum of the lengths of the first sides and the sum of the lengths of the second sides are substantially equal. According to this, the capacitance component configured between the upper surface conductor portion and the second side conductor portion and the capacitance component configured between the first terminal electrode and the first side conductor portion are substantially equal. can do.

  In the present invention, the first and second side conductor portions may have an axially symmetric shape with a straight line orthogonal to the upper side and the lower side as an axis, and a rotationally symmetric shape with the center of the side surface as an axis. You may have. Regardless of the shape, even if the orientation of the substrate is changed by 180 degrees on the mounting substrate, the shape of the conductor pattern seen from one direction is substantially the same, so the antenna characteristics change greatly depending on the mounting orientation. Therefore, the antenna design can be facilitated.

  In the present invention, the width of the gap is preferably constant at an arbitrary position in the extending direction of the gap. According to this, setting of the capacitance value by the gap can be facilitated.

  In the present invention, it is preferable that the first and second side conductor portions are constituted by a combination of a horizontal conductor portion parallel to the upper side and the lower side and a vertical conductor portion orthogonal to the upper side and the lower side. In this case, the first side conductor portion includes a first horizontal conductor portion provided in contact with the first side and in parallel with the first side, and the second side conductor portion includes It is preferable to have a second horizontal conductor portion provided in contact with the second side and in parallel with the second side. According to this, the shape of the 1st and 2nd side surface conductor part which show | plays the effect of this invention can be designed easily.

  As described above, according to the present invention, even if printing misalignment occurs during electrode formation, radiation characteristics are hardly affected, a large load capacity can be obtained, and the resonance frequency can be set lower. An antenna device can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a configuration of an antenna device according to a first embodiment of the present invention. FIG. 2 is a development view of the antenna device shown in FIG.

  As shown in FIGS. 1 and 2, the antenna device 10 includes a base body 11 made of a substantially rectangular parallelepiped dielectric, and a conductor pattern formed on each surface of the base body 11. The conductor pattern includes an upper surface conductor portion 12 formed on the entire upper surface of the base body 11, first and second side surface conductor portions 13 and 14 formed on a first side surface 11C orthogonal to the longitudinal direction of the base body 11, The third side conductor portion 15 is formed on the second side surface 11D parallel to the first side surface 11C, and the first to third terminal electrodes 16 to 18 are formed on the bottom surface 11B of the base 11. Note that no conductor pattern is formed on the third and fourth side surfaces 11E and 11F of the base 11.

  What is necessary is just to set the magnitude | size of the base | substrate 11 suitably according to the target antenna characteristic. Although not particularly limited, in the present embodiment, it may be 10 × 2 × 4 (mm).

  Although it does not specifically limit as a material of the base | substrate 11, Ba-Nd-Ti type material (relative dielectric constant 80-120), Nd-Al-Ca-Ti type material (relative dielectric constant 43-46), Li—Al—Sr—Ti (relative permittivity 38 to 41), Ba—Ti based material (relative permittivity 34 to 36), Ba—Mg—W based material (relative permittivity 20 to 22), Mg—Ca— Ti-based materials (relative permittivity 19 to 21), sapphire (relative permittivity 9 to 10), alumina ceramics (relative permittivity 9 to 10), cordierite ceramics (relative permittivity 4 to 6), and the like can be used. . The base 11 is produced by firing these materials using a mold.

What is necessary is just to select a dielectric material suitably according to the target frequency. As the relative permittivity ε _r increases, a larger wavelength shortening effect is obtained, and the length of the radiation conductor becomes shorter. Therefore, the relative permittivity ε _r does not necessarily have to be large, and an appropriate value exists. For example, when the target frequency is 2.40 GHz, it is preferable to use a material having a relative dielectric constant ε _r of about 5 to 30. According to this, the radiation conductor can be reduced in size while securing a sufficient gain. Preferred examples of the material having a relative dielectric constant ε _r of about 5 to 30 include Mg—Ca—Ti based dielectric ceramics. As the Mg—Ca—Ti dielectric ceramic, it is particularly preferable to use a Mg—Ca—Ti dielectric ceramic containing TiO ₂ , MgO, CaO, MnO, and SiO ₂ .

  The upper conductor portion 12 is a conductor pattern formed on substantially the entire upper surface 11 </ b> A of the base 11. One end of the upper surface conductor portion 12 in the longitudinal direction (X direction) is connected to the first side surface conductor portion 13. The other end in the longitudinal direction of the upper surface conductor portion 12 is connected to the second terminal electrode 17 through the second side surface conductor portion 14. Further, the second side conductor portion 14 is electromagnetically connected to the first side conductor portion 13 through the gap 19. Thereby, the 2nd side conductor part 14, the 1st side conductor part 13, the upper surface conductor part 12, and the 3rd side conductor part 15 comprise the substantially linear radiation conductor which continues electromagnetically. . As described above, since the radiation conductor is formed over a plurality of surfaces of the base body 11, a desired electrical length can be ensured even if the base body 11 itself is downsized.

  The first side conductor portion 13 is a conductor pattern formed in a region above the first side surface 11 </ b> C of the base body 11, and is connected to the upper surface conductor portion 12. The second side conductor portion 14 is a conductor pattern formed in a region below the first side surface 11 </ b> C, and is connected to the first terminal electrode 16. A gap 19 having a predetermined width is provided between the first side conductor portion 13 and the second side conductor portion 14.

  The third side conductor portion 15 is a conductor pattern formed on substantially the entire second side surface 11D of the base. Therefore, the upper surface conductor portion 12 is connected to the second terminal electrode via the third side surface conductor portion 15.

  The first terminal electrode 16 and the second terminal electrode 17 are rectangular conductor patterns respectively formed at one end and the other end in the longitudinal direction of the bottom surface 11B of the base body 11. The third terminal electrode 18 is a conductor pattern formed at the center in the longitudinal direction of the bottom surface 11 </ b> B of the base 11, and is provided between the first terminal electrode 16 and the second terminal electrode 17. Yes. The sizes of the first terminal electrode 16 and the second terminal electrode 17 are preferably the same, and the first to third terminal electrodes 16 to 18 have axes perpendicular to the upper and lower surfaces 11A and 11B of the base 11 ( It is preferable to have symmetry that is the same shape when rotated 180 degrees with respect to the Z axis). According to this, the layout design on the mounting substrate can be facilitated, and the antenna characteristics can be stabilized and the reliability can be improved.

  These conductor patterns formed on each surface of the substrate 11 are preferably formed so as to be symmetrical with respect to a plane parallel to the third and fourth side surfaces 11E and 11F of the substrate 11. According to this, since the shape of the conductor pattern of the base body 11 viewed from the end side of the mounting substrate 20 is substantially the same even if the direction of the base body 11 is rotated 180 degrees around the Z axis, the mounting is performed. The antenna characteristics do not change greatly depending on the orientation of the antenna, and the antenna design can be facilitated.

  FIG. 3 is a schematic plan view showing the shapes of the first and second side conductor portions 13 and 14.

  As shown in FIG. 3, the first and second side conductor portions 13, 14 have a bilaterally symmetric shape with the Z axis as an axis, and in particular, have an uneven shape that meshes with each other via a gap 19. Yes. In the present embodiment, the first side conductor portion 13 has a concave shape, and the second side conductor portion has a convex shape. The uneven shape of the first and second side conductor portions 13 and 14 is such that the horizontal conductor portion which is a strip-like conductor pattern parallel to the upper side and the lower side of the first side surface 11C, and the upper side and the lower side. And a vertical conductor portion which is a vertical belt-like conductor pattern.

The first side conductor portion 13 constitutes one side of the tip portion of the vertical conductor portion extending downward, and is the first side that is parallel and closest to the lower side 11b of the first side surface 11C. Side 13a, 13a. Further, the second side conductor portion 14 constitutes one side of the tip portion of the vertical conductor portion extending upward, and is the side that is parallel and closest to the upper side 11a of the first side surface 11C. It has a second side 14a. The tip of the vertical conductor portion of the second side conductor portion 14 is close to the ridge line of the first side conductor portion 13, and the tip of the vertical conductor portion of the first side conductor portion 13 is the second side conductor portion 13. It is close to the ridge line of the side conductor portion 14. Then, in the present embodiment, the distance _{L 1} from the first side 13a to the lower side 11b, a distance _{L 2} from the second side 14a to the upper side 11a is set to be equal.

The first side conductor portion 13 has a first horizontal conductor portion 13 b provided in contact with the upper side 11 a of the base 11 and parallel to the upper side 11 a, and the second side conductor 14 is formed of the base 11. The second horizontal conductor portion 14b is provided in contact with the lower side 11b and in parallel with the lower side 11b. Then, in the present embodiment, the distance _{L 3} from the first side 13a to the second horizontal conductive portion 14b, the distance _{L 4} and is set equal to the second side 14a to the first horizontal conductor part 13b Has been. This means that the width of the gap 19 extending in the horizontal direction is equal. It is preferable that the width of the gap 19 is always constant at an arbitrary position in the extending direction of the gap 19. According to this, setting of the capacitance value by the gap can be facilitated. However, it may not always be constant, and the width of the gap extending in the horizontal direction may be different from the width of the gap extending in the vertical direction.

  Further, in the present embodiment, it is preferable that the sum of the lengths of the first sides 13a and 13a and the length of the second side 14a are set equal. According to this, the capacitance component constituted between the upper surface conductor portion 12 and the second side conductor portion 14 and the capacitance component constituted between the first terminal electrode 16 and the first side conductor portion 13. Can be made approximately equal.

  FIG. 4 is a schematic plan view showing a state where the first and second side conductor portions 13 and 14 are displaced in the vertical direction.

As shown in FIG. 4A, when the first and second side conductor portions 13 and 14 are displaced upwardly, the widths of the second horizontal conductor portions 14b and 14b are increased, and the first since the first side 13a of the side conductor portions 13 becomes longer distance L ₁ to the lower side 11b of the base 11, the capacitive coupling at this portion becomes weak. However, the width of the first horizontal conductor part 13b is narrowed, the distance L ₂ to the upper side 11a of the base 11 from the second side 14a of the second side surface conductor 14 is shortened, capacitive coupling in this part Become stronger. As a result, partial fluctuations in capacitive coupling are canceled out, and a constant load capacity can be maintained as a whole even if the first and second side conductor portions 13 and 14 are displaced upward.

As shown in FIG. 4B, the same applies to the case where the first and second side conductor portions 13 and 14 are printed downward. That is, the second horizontal conductor portions 14b, the width of 14b is narrowed, the distance _{L 1} from the first side 13a of the first side surface conductor 13 to the lower side 11b of the base 11 is reduced, capacitance in this portion Bonding becomes stronger. However, the width of the first horizontal conductor part 13b becomes wider, the distance L ₂ to the upper side 11a of the base 11 from the second side 14a of the second side surface conductor portion 14 becomes longer, the capacitive coupling in this part become weak. As a result, partial fluctuations in capacitive coupling are canceled out, and a constant load capacity can be maintained as a whole even if the first and second side conductor portions 13 and 14 are displaced downward.

  FIG. 5 is a schematic perspective view showing a state where the antenna device 10 is mounted on the mounting substrate 20.

  As shown in FIG. 5, the mounting substrate 20 includes a ground clearance area 21 in which no ground pattern is provided, a ground pattern 22 provided around the ground clearance area 21, and a first pattern provided in the ground clearance area 21. The first to third lands 23 to 25 and the power supply line 26 connected to the second land 24 are provided. Although not shown, various electronic components for configuring a wireless communication device are mounted on the mounting board 20.

  The ground clearance region 21 is provided in contact with the end 20 a of the mounting substrate 20. Therefore, the three directions around the ground clearance region 21 are surrounded by the ground pattern 22, but the remaining one direction is an open space where no substrate exists. Although the ground pattern is also formed on the back surface or the inner layer of the mounting substrate 20, it may exist directly under the antenna mounting region, and the ground clearance region is directly under the antenna mounting region, like the top surface of the mounting substrate. Also good. That is, the mounting substrate 20 may be a so-called on-ground type or an off-ground type.

  The first land 23 in the ground clearance region 21 is connected to the ground pattern 22 via the ground pattern 22a. The first land 23 corresponds to the first terminal electrode 16 of the antenna device 10, the second land 24 corresponds to the second terminal electrode 17, and the third land 25 corresponds to the third terminal electrode 17. It corresponds to the terminal electrode 18. Therefore, when the antenna device 10 is mounted on the mounting substrate 20, the first terminal electrode 16 is the first land 23, the second terminal electrode 17 is the second land 24, and the third terminal electrode 18 is the third land. Each of the lands 25 is soldered.

  The power supply line 26 is connected to the second land 24, and a chip reactor 31 that is an impedance adjusting unit is mounted between the power supply line 26 and the ground pattern 22. The mounting position of the chip reactor 31 is preferably outside the ground clearance area 21 and as close as possible to the ground clearance area 21.

  Between the third land 25 and the ground pattern 22, a chip reactor 32 as a frequency adjusting means is mounted. The chip reactor 32 is inserted in series between the lead portion 25 a of the third land 25 and the ground pattern 22. The mounting position of the chip reactor 32 is preferably outside the ground clearance region 21 and as close as possible to the ground pattern 22.

  In the configuration as described above, the current supplied to the antenna device 10 through the feed line 26 and the second land 24 is the second terminal electrode 17, the third side conductor portion 15, the upper conductor portion 12, The first side conductor part 13 and the second side conductor part 14 are passed through and finally flow into the ground patterns 22a and 22. A predetermined electromagnetic field is generated by supplying current to the antenna device 10 in this manner, and the entire antenna device 10 functions as an antenna.

As described above, the antenna device 10 according to the present embodiment has an uneven shape in which the first and second side conductor portions 13 and 14 provided via the gap 19 are engaged with each other, and the first side conductor. Since the distance L ₁ between the tip of the portion 13 and the terminal electrode 16 is set equal to the distance L ₂ between the end of the second side conductor portion 14 and the top conductor portion 12, printing is performed at the time of electrode formation. Even if a deviation occurs, the radiation characteristics are hardly affected, a large load capacity can be obtained, and the resonance frequency can be set lower.

  Next, a modification of the shape of the first and second side conductor portions 13 and 14 will be described in detail.

  6 to 10 are schematic plan views showing modified examples of the shapes of the first and second side conductor portions 13 and 14.

  The first and second side surface conductor portions 13 and 14 shown in FIG. 6 are characterized in that they are composed of only vertical conductor portions. Therefore, the first horizontal conductor portion 13b and the second horizontal conductor portion 14b in FIG. 3 are not formed. Since the first horizontal conductor portion 13b is eliminated from the first side conductor portion 13, the first side conductor portion 13 is separated into two vertical conductor portions 13A and 13B.

The first side conductor portion 13 is one side of the tip of the vertical conductor portion extending downward, and is the first side that is parallel and closest to the lower side 11b of the first side surface 11C. 13a, 13a. The second side conductor portion 14 is a second side which is one side of the tip portion of the vertical conductor portion extending upward and which is parallel to and closest to the upper side 11a of the first side surface 11C. Side 14a. Then, in the present embodiment, the distance _{L 1} from the first side 13a to the lower side 11b, a distance _{L 2} from the second side 14a to the upper side 11a is set to be equal. This means that the width of the gap 19 extending in the horizontal direction is equal. It is preferable that the width of the gap 19 is always constant at an arbitrary position in the extending direction of the gap 19. According to this, setting of the capacitance value by the gap can be facilitated. However, it may not always be constant, and the width of the gap extending in the horizontal direction may be different from the width of the gap extending in the vertical direction.

  Furthermore, in the present embodiment, it is preferable that the sum of the lengths of the first sides 13a and 13a and the length of the second sides are set equal. According to this, the capacitance component constituted between the upper surface conductor portion 12 and the second side conductor portion 14 and the capacitance component constituted between the first terminal electrode 16 and the first side conductor portion 13. Can be made substantially equal.

  The first and second side conductor portions 13 and 14 shown in FIGS. 7A and 7B are characterized by having more uneven shapes than the side conductor portions 13 and 14 shown in FIG. In FIG. 7A, the first side conductor portion 13 is constituted by two concave conductor patterns, and the second side conductor portion 14 is constituted by two convex conductor patterns. In FIG. 7B, the first side conductor portion 13 is constituted by three concave conductor patterns, and the second side conductor portion 14 is constituted by three convex conductor patterns. According to the above configuration, the same effect as the side conductor portions 13 and 14 shown in FIG. 1 can be obtained, and the length of the gap 19 can be increased by meandering further. Therefore, the capacitance value due to the gap 19 can be further increased.

  The first and second side conductor portions 13 and 14 shown in FIGS. 8A and 8B are thicker at the front end side and narrower at the rear end side than the side conductor portions 13 and 14 shown in FIG. It is characterized by that. In particular, in FIG. 8A, the thick portion 14w and the thin portion 14n of the vertical conductor portion of the side conductor portion 14 are present at substantially the same ratio, and the width of the gap 19 is constant at an arbitrary position. Yes. On the other hand, in FIG. 8 (b), the proportion of the thick portion 14w is smaller than that in FIG. 8 (a), only a small portion is provided at the tip of the vertical conductor portion, and most of the remaining portions are thin. Part 14n. Similarly, in the vertical conductor portion of the side conductor portion 13, the proportion of the thick portion 13w is smaller than that in FIG. 8A, and the remaining most portion is the thin portion 13n. Accordingly, only the width of the gap 19 extending in the horizontal direction is equal, and the width of the gap 19 extending in the horizontal direction is different from the width of the gap 19 extending in the vertical direction.

  According to the configuration shown in FIG. 8, not only the same effects as the side conductor portions 13 and 14 shown in FIG. 1 can be obtained, but also the lengths and side surfaces of the first sides 13 a and 13 a of the side conductor portion 13. Since the length of the second side 14a of the conductor portion 14 can be made longer, the capacity can be increased. Furthermore, since the length of the gap 19 can be increased by meandering, the capacitance value of the gap 19 can be further increased.

  The features of the first and second side conductor portions 13 and 14 shown in FIGS. 9A and 9B are uneven shapes that mesh in the vertical direction like the side conductor portions 13 and 14 shown in FIGS. Instead, it is in the shape of an uneven shape that meshes in the horizontal direction. Further, it has a rotationally symmetric shape with the X axis (see FIG. 1) as a rotational axis, not a symmetrical shape with the Z axis (see FIG. 1) as a symmetric axis. Therefore, the uneven shape of the first side conductor part 13 and the second side conductor part 14 is the same. The side conductor portions 13 and 14 shown in FIG. 9B have more uneven shapes than the side conductor portions 13 and 14 shown in FIG. The uneven shape of the first and second side surface conductor portions 13 and 14 is obtained by combining a horizontal conductor portion parallel to the upper side and the lower side of the first side surface 11C and a vertical conductor portion orthogonal to the upper side and the lower side. It is configured.

The first side conductor portion 13 has a first side 13a that is a side that is parallel and closest to the lower side 11b of the first side surface 11C, and the second side conductor portion 14 is a first side surface. 11C has a second side 14a that is the side closest to and parallel to the upper side 11a of 11C. The first side 13a constitutes one side of the horizontal conductor portion, and the second side 14a also constitutes one side of the tip portion of the horizontal conductor portion. Then, in the present embodiment, the distance _{L 1} from the first side 13a to the lower side 11b, a distance _{L 2} from the second side 14a to the upper side 11a is set to be equal.

The first side conductor portion 13 has a first horizontal conductor portion 13 b provided in contact with the upper side 11 a of the base 11 and parallel to the upper side 11 a, and the second side conductor 14 is formed of the base 11 The second horizontal conductor portion 14b is provided in contact with the lower side 11b and in parallel with the lower side 11b. Then, in the present embodiment, the distance L ₃ from the first side 13a to the second horizontal conductive portion 14b, a distance L ₄ from the second side to the lower side are set equal. This means that the width of the gap 19 extending in the horizontal direction is equal. It is preferable that the width of the gap 19 is always constant at an arbitrary position in the extending direction of the gap 19. According to this, setting of the capacitance value by the gap can be facilitated. However, it may not always be constant, and the width of the gap extending in the horizontal direction may be different from the width of the gap extending in the vertical direction.

  Furthermore, in the present embodiment, it is preferable that the total length of the first side 13a and the length of the second side 14a are set equal. According to this, the capacitance component constituted between the upper surface conductor portion 12 and the second side conductor portion 14 and the capacitance component constituted between the first terminal electrode 16 and the first side conductor portion 13. Can be made substantially equal.

  The first and second side conductor portions 13 and 14 shown in FIG. 10 are composed of a combination of a parallel conductor portion and a vertical conductor portion like the side conductor portions 13 and 14 shown in FIG. 9A. Instead, it is characterized in that a gap 19 having an inclined side and extending in an oblique direction is formed. Since other configurations are the same as those of the side conductor portions 13 and 14 shown in FIG. 9A, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. Thus, even if the side conductor portions 13 and 14 having the inclined sides are used, the same effects as those of the side conductor portions 13 and 14 shown in FIG. 9 can be obtained.

  Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Needless to say, these are also included in the scope of the present invention.

  For example, in the antenna device in each of the embodiments described above, the base 11 has a rectangular parallelepiped shape, but it is not essential that the base 11 is a strict rectangular parallelepiped. It may be provided. Furthermore, it is not limited to a rectangular parallelepiped, but may be a shape such as a polygonal column or a cylinder.

Moreover, in the said embodiment, although the dielectric material is used as a material of the base | substrate 11, you may use the magnetic body which has dielectricity other than a dielectric material. In this case, since a wavelength shortening effect of 1 / {(ε × μ) ^1/2 } is obtained, a large wavelength shortening effect can be obtained by using a magnetic material having a high magnetic permeability μ. Moreover, since μ / ε determines the impedance of the electrode, the impedance can be increased by using a magnetic material having a high μ. As a result, the Q of the antenna that is too high can be lowered to obtain wideband characteristics.

  Moreover, in the said embodiment, although chip reactors 31 and 32 are used as an impedance adjustment means and a frequency adjustment means, this invention is not limited to such a structure, You may use a conductor pattern.

  Moreover, in the said embodiment, although the 3rd side conductor part 15 side without a gap is a feeding point of an antenna, you may make the 2nd side conductor part 14 side in which the gap 19 was formed into a feeding point. . In other words, the first and second side conductor portions 13 and 14 and the third side conductor portion 15 may be mounted on the mounting substrate 20 in a state where the first and second side conductor portions 13 and 14 are interchanged. When mounted in this manner, the third side conductor portion 15 can be removed, and the other end of the top conductor portion 12 can be an open end.

  Moreover, in the said embodiment, although the 3rd terminal electrode 18 is provided, the 3rd terminal electrode 18 can also be abbreviate | omitted.

1 is a schematic perspective view showing a configuration of an antenna device according to a first embodiment of the present invention. FIG. 2 is a development view of the antenna device shown in FIG. 1. 4 is a schematic plan view showing the shapes of first and second side conductor portions 13 and 14. FIG. It is a schematic plan view showing a state where the first and second side conductor portions are displaced in the vertical direction, where (a) shows a state where printing is displaced upward, and (b) shows a state where printing is displaced downward. Yes. 1 is a schematic perspective view showing a state where an antenna device 10 is mounted on a mounting board 20. FIG. 10 is a schematic plan view showing a modification of the shape of the first and second side conductor portions 13 and 14. It is a schematic plan view showing a modification of the shape of the first and second side conductor portions 13 and 14, wherein (a) has two uneven shapes, (b) has three uneven shapes. Show. FIG. 6 is a schematic plan view showing a modification of the shape of the first and second side conductor portions 13 and 14, wherein (a) shows that the thick portion 13w and the thin portion 13n on the tip side of the vertical conductor portion have substantially the same ratio. When it exists, (b) has shown the case where the ratio of the thick part 13w at the front end side of a perpendicular | vertical conductor part is less than the thin part 13n. FIG. 10 is a schematic plan view showing a modification of the shape of the first and second side conductor portions 13 and 14, and (a) shows a case where the side conductor portions 13 and 14 have an uneven shape that meshes in the horizontal direction; Shows a case of having more concavo-convex shapes than (a). FIG. 10 is a schematic plan view showing a modification of the shape of the first and second side conductor portions 13 and 14. It is a schematic perspective view which shows an example of a structure of the conventional antenna device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antenna apparatus 11 Base | substrate 11A Base | substrate upper surface 11B Base | substrate bottom face 11C Base | substrate 1st side surface 11D Base | substrate 2nd side surface 11E Base | substrate 3rd side surface 11D Base | substrate 4th side surface 11a 1st side surface top side 11b 1st Lower side 12 of one side surface Upper surface conductor portion 13 First side conductor portion 13A Vertical conductor portion 13B of first side conductor portion Vertical conductor portion 13a of first side conductor portion One side of first side conductor portion (first Side)
13b Horizontal conductor portion 13n of the first side conductor portion 13n Thin portion of the vertical conductor portion 13w Thick portion of the vertical conductor portion 14 Second side conductor portion 14a One side (second side) of the second side conductor portion
14b Horizontal conductor portion 14n of second side conductor portion 14n Thin portion of vertical conductor portion 14w Thick portion of vertical conductor portion 15 Side conductor portion 16 First terminal electrode 17 Second terminal electrode 18 Third terminal electrode 19 Gap 20 Mounting substrate 20a Mounting substrate edge 21 Ground clearance region 22 Ground pattern 23 First land 24 Second land 25 Third land 25a Third land lead portion 26 Feed line 31-32 Chip reactor 50 Antenna device 51 Base 52 Upper Conductor 53-55 Side Conductor 56 Terminal Electrode 57 Terminal Electrode 58 Terminal Electrode 59 Gap

Claims (7)

A base, a top conductor formed on the top of the base, a terminal electrode formed on the bottom of the base, and a first side formed on a side of the base and connected to one end of the top conductor A conductor portion; a second side conductor portion formed on the side surface of the base together with the first side conductor portion, and connected to one end of the terminal electrode;
The first and second side conductor portions have an uneven shape that meshes with each other through a gap,
The first side conductor portion has a first side parallel and closest to the lower side of the side surface,
The second side conductor portion has a second side parallel and closest to the upper side of the side surface,
The antenna apparatus according to claim 1, wherein a distance from the first side to the lower side is substantially equal to a distance from the second side to the upper side.   The antenna apparatus according to claim 1, wherein a total sum of the lengths of the first sides and a total sum of the lengths of the second sides are substantially equal.   3. The antenna device according to claim 1, wherein the first and second side conductor portions have an axisymmetric shape with a straight line orthogonal to the upper side and the lower side as axes.   The antenna device according to claim 1, wherein the first and second side conductor portions have a rotationally symmetric shape with the center of the side surface as an axis.   5. The antenna device according to claim 1, wherein a width of the gap is constant at an arbitrary position in an extending direction of the gap. 6.   The first and second side conductor portions are constituted by a combination of a horizontal conductor portion parallel to the upper side and the lower side and a vertical conductor portion orthogonal to the upper side and the lower side. Item 6. The antenna device according to any one of Items 1 to 5. The first side conductor portion has a first horizontal conductor portion provided in contact with the first side and in parallel with the first side,
The antenna device according to claim 6, wherein the second side conductor portion includes a second horizontal conductor portion provided in contact with the second side and in parallel with the second side.

Images