JP4867787B2 - Antenna device - Google Patents

Antenna device Download PDF

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JP4867787B2
JP4867787B2 JP2007134909A JP2007134909A JP4867787B2 JP 4867787 B2 JP4867787 B2 JP 4867787B2 JP 2007134909 A JP2007134909 A JP 2007134909A JP 2007134909 A JP2007134909 A JP 2007134909A JP 4867787 B2 JP4867787 B2 JP 4867787B2
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pattern
conductor
antenna
branch
circuit board
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JP2008294491A (en
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武 大橋
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Tdk株式会社
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Description

  The present invention relates to an antenna device, and more particularly to an antenna device using a surface mount type antenna block.

A small wireless communication device such as a cellular phone has a small antenna block. In general, this type of antenna block has a radiation conductor formed on the surface of a base made of a dielectric (see Patent Documents 1 and 2). In addition, an antenna block is also known in which a radiation conductor formed on the surface of a base is tapered in order to obtain a wider band (see Patent Document 3).
Japanese Patent No. 3114582 Japanese Patent No. 3114605 JP 2001-358516 A

  However, there is a limit to securing the antenna length only by forming the radiation conductor on the surface of the base, and it is difficult to reduce the size of the antenna block while maintaining the required antenna length.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an antenna device capable of obtaining a longer antenna length using a small antenna block.

  Another object of the present invention is to provide an antenna device having a wide band while obtaining a longer antenna length using a small antenna block.

  An antenna device according to the present invention is an antenna device including an antenna block having at least one conductor pattern and a printed circuit board on which the antenna block is mounted, the printed circuit board being connected via the antenna block. It has a feed conductor and a radiation conductor, and the radiation conductor includes a plurality of branch patterns formed in different wiring layers of the printed circuit board.

  According to the present invention, since the radiation conductor is formed on the printed circuit board on which the antenna block is mounted, it is possible to obtain a longer antenna length using a small antenna block. Moreover, in this invention, since the radiation conductor formed in the printed circuit board contains the several branch pattern, an equivalent radiation conductor width becomes wide. For this reason, a wider band can be obtained. Moreover, since these branch patterns are formed in different wiring layers of the printed circuit board, the conductor width of one branch pattern can be set to be somewhat narrow. For this reason, a sufficient distance between the radiation conductor on the printed circuit board and the antenna block can be secured, and as a result, desired antenna characteristics can be secured.

  In the present invention, “connected through an antenna block” does not necessarily have to be connected in a direct current, but may be connected in a high frequency in the signal band of the antenna device. Therefore, a gap or the like may be interposed between the feed conductor and the radiation conductor. For example, the antenna block has a first conductor pattern connected to the feeding conductor and a second conductor pattern connected to the radiation conductor, and the first and second conductor patterns are interposed via a gap. It is possible to have an opposing structure.

  In the present invention, it is preferable that the plurality of branch patterns include a first branch pattern formed on the mounting surface of the antenna block and a second branch pattern formed on the back surface of the mounting surface. According to this, it is possible to obtain the above-described configuration only by forming branch patterns on the upper and lower surfaces of the printed circuit board and connecting them with through-hole electrodes. This eliminates the need to use a printed circuit board having a multilayer structure.

  In this case, it is preferable that at least a part of the first and second branch patterns overlap in plan view. According to this, the clearance area including the antenna mounting area can be reduced in size.

  Moreover, it is preferable that at least a part of the first branch pattern extends in parallel with one end of the antenna block. This is because the distance between the radiation conductor formed on the printed circuit board and the antenna block greatly affects the resonance frequency.

  In the present invention, it is preferable that the conductor width of the second branch pattern is wider at least partially than the first branch pattern. In this case, it is preferable that the second branch pattern has a tapered shape in which the conductor width increases from the branch point toward the end. According to this, since the equivalent radiating conductor width becomes wider, it becomes possible to make the band wider. In addition, since the second branch pattern is formed on a different surface from the antenna mounting area, the influence on the antenna characteristics is small even if the conductor width is increased.

  As described above, according to the present invention, it is possible to obtain a longer antenna length by using a small antenna block and obtain a wide band.

  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 10 according to a preferred embodiment of the present invention. As shown in FIG. 1, the antenna device 10 includes an antenna block 100 and a printed board 200 having a mounting area (antenna mounting area) for the antenna block 100.

  FIG. 2 is a schematic perspective view showing the configuration of the antenna block 100. FIG. 3 is a development view of the antenna block 100. As shown in FIGS. 2 and 3, the antenna block 100 includes a base 110 made of a dielectric and a conductor pattern 120 provided on the surface of the base 110.

  The base 110 has a rectangular parallelepiped shape in which the A direction is the longitudinal direction, the B direction is the width direction, and the C direction is the height direction, and the top surface 111 and the bottom surface 112 are parallel to the A direction and the B direction. The first side surface 113 and the second side surface 114 are parallel to the direction and the C direction, and the third side surface 115 and the fourth side surface 116 are parallel to the A direction and the C direction. The size of the base 110 may be appropriately set according to the target antenna characteristics.

  Although it does not specifically limit as a material of the base | substrate 110, 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 110 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 dielectric constant ε r increases, a greater wavelength shortening effect can be obtained, so that the length of the radiation conductor can be shortened. However, this is not necessarily the case where the relative dielectric constant ε r is large, and an appropriate value is obtained. Exists. Therefore, for example, when the target frequency is about 2.6 GHz, it is preferable to use a material having a relative dielectric constant ε r of about 20 to 25. 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 20 to 25 include Mg—Ca—Ti 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 conductor pattern 120 provided on the surface of the base 110 includes a conductor pattern 121 provided on the entire upper surface 111, conductor patterns 122 and 125 provided on a part of the bottom surface 112, and a part of the first side surface 113. And a conductor pattern 124 provided on the entire surface of the second side surface 114. These conductor patterns can be formed by applying an electrode paste material by a method such as screen printing or transfer and then baking under a predetermined temperature condition. Silver, silver-palladium, silver-platinum, copper, or the like can be used as the electrode paste material. In the present embodiment, the conductor pattern is not formed on the third and fourth side surfaces 115 and 116 of the base 110, but may be formed as necessary.

  Among these, the conductor patterns 121, 124, and 125 constitute one continuous belt-like pattern and contribute as part of the radiation conductor. The conductor patterns 122 and 123 also form a continuous strip pattern and contribute as part of the feed conductor.

  The radiation conductor constituted by the conductor patterns 121, 124, and 125 and the feeding conductor constituted by the conductor patterns 122 and 123 are connected via a gap G that exists between the conductor pattern 121 and the conductor pattern 123. . That is, the radiating conductor and the feeding conductor are connected to each other through capacitive coupling by the gap G.

  FIG. 4 is a schematic plan view showing a pattern layout of the surface (mounting surface of the antenna block) of the printed circuit board 200 on which the antenna block 100 is mounted. FIG. 5 is a schematic plan view showing the pattern layout of the back surface of the printed circuit board 200 on which the antenna block 100 is mounted, and particularly shows a state seen transparently from the front surface side.

  As shown in FIG. 4, on the surface of the printed circuit board 200, there are a clearance area 210 that is an insulating area provided near the outer periphery of the board, an antenna mounting area 211 provided in the clearance area 210, and a clearance area 210. A ground pattern 220 provided on the outside, first and second land patterns 231 and 232 provided on both sides of the antenna mounting region 211 in the longitudinal direction, and a power supply having one end connected to the first land pattern 231 A conductor 240 and a first branch pattern 251 that constitutes a part of the radiation conductor 250 are provided. One end of the radiation conductor 250 is connected to the second land pattern 232.

  The first and second land patterns 231 and 232 are patterns connected to the conductor patterns 122 and 125 provided in the antenna block 100, respectively. Therefore, when the antenna block 100 is mounted in the antenna mounting region 211, the power supply conductor 240 and the radiation conductor 250 are connected via the antenna block 100.

  Further, the clearance area 210 formed on the surface of the printed circuit board 200 is surrounded by the ground pattern 220 in the three directions around it. Accordingly, the antenna mounting region 211 is surrounded by the first and second edge lines 220a and 220b of the ground pattern orthogonal to the longitudinal direction and the third edge line 220c of the ground pattern parallel to the longitudinal direction. become. The remaining one direction is the peripheral portion of the printed circuit board 200, which is a region where there is no ground pattern (open region 261).

  On the other hand, as shown in FIG. 5, on the back surface of the printed circuit board 200, a clearance region 270 that covers substantially the same range as the clearance region 210 on the front surface side, a ground pattern 280 provided outside the clearance region 270, and radiation A second branch pattern 252 constituting a part of the conductor 250 is provided.

  The clearance area 270 formed on the back surface of the printed circuit board 200 is surrounded by a ground pattern 280 in three directions. In other words, the projection area 212 of the antenna mounting area 211 includes the first and second edge lines 280a and 280b of the ground pattern orthogonal to the longitudinal direction and the third edge line 280c of the ground pattern 280 parallel to the longitudinal direction. It will be surrounded by. The remaining one direction is the peripheral portion of the printed circuit board 200, which is a region where there is no ground pattern (open region 262).

  In the present embodiment, the radiation conductor 250 includes first and second branch patterns 251 and 252, which are formed on the front surface side and the back surface side of the printed circuit board 200, respectively.

  The first branch pattern 251 has one end connected to the through-hole electrode 253 and the other end connected to the ground pattern 220. The first branch pattern 251 is arranged along the antenna mounting region 211, and the conductor width w1 is constant. For this reason, when the antenna block 100 is mounted in the antenna mounting region 211, the first branch pattern 251 extends in parallel with one end of the antenna block 100. The through-hole electrode 253 is an electrode that penetrates from the front surface to the back surface of the printed circuit board 200 and is connected to the second branch pattern 252.

  The second branch pattern 252 has one end connected to the through-hole electrode 253 and the other end connected to the ground pattern 280. As shown in FIG. 5, the second branch pattern 252 has a tapered shape in which the conductor width increases from the through-hole electrode 253 that is a branch point toward the ground pattern 280. Thereby, in the vicinity of the through-hole electrode 253 which is a branch point, the conductor widths of the first branch pattern 251 and the second branch pattern 252 are substantially the same (= w1), but as it goes toward the end, The conductor width of the second branch pattern 252 gradually becomes wider than that of the first branch pattern 251. The conductor width of the second branch pattern 252 is maximized at the connection portion with the ground pattern 280 (= w2).

  Further, the first and second branch patterns 251 and 252 partially overlap in plan view. Thereby, the clearance area | regions 210 and 270 can be reduced in size. Further, the second branch pattern 252 and the antenna mounting area 211 do not overlap in plan view. That is, the taper shape of the second branch pattern 252 is set so as not to overlap with the antenna mounting region 211 in plan view. This is because if the second branch pattern 252 and the antenna mounting area 211 overlap in plan view, the antenna characteristics may vary due to interference.

  When the antenna block 100 is mounted on the printed circuit board 200 having such a structure, as shown in FIG. 1, a radiation conductor composed of the conductor patterns 121, 124, and 125 formed on the antenna block 100 and the printed circuit board 200 are formed. The radiating conductor 250 becomes a continuous conductor. As a result, a longer antenna length can be secured as compared with the case where the radiation conductor is formed only in the antenna block 100.

  Further, the distance between the radiation conductor 250 formed on the printed circuit board 200 and the antenna block 100 greatly affects the resonance frequency. If the distance between the two is too close, the resonance frequency is shifted. For this reason, in order to arrange the radiation conductor 250 in the limited clearance region 210, the conductor width of the radiation conductor 250 must be set to be thin to some extent. On the other hand, if the conductor width of the radiation conductor 250 is reduced, the transmission / reception band of the antenna is reduced. However, in this embodiment, since the radiation conductor 250 is branched into the first branch pattern 251 and the second branch pattern 252 and these are formed on different surfaces of the printed circuit board 200, the first branch pattern 251 is formed. It is possible to increase the equivalent radiation conductor width without increasing the conductor width. As a result, it is possible to increase the bandwidth while ensuring the distance between the radiation conductor 250 and the antenna block 100.

  As described above, according to the present embodiment, since the radiation conductor 250 is also formed on the front surface and the back surface of the printed circuit board 200, a sufficient antenna length can be ensured. Moreover, since the radiating conductor 250 is branched into the first and second branch patterns 251 and 252, the equivalent radiating conductor width is widened while ensuring the distance between the radiating conductor 250 and the antenna block 100. Is possible.

  In addition, in the present embodiment, the second branch pattern 252 formed on the back surface of the printed circuit board 200 has a tapered shape, and the conductor width increases from the through hole electrode 253 that is a branch point toward the ground pattern 280. Since it is wide, a wider band can be obtained.

  The preferred embodiments of the present invention have been described above, but 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, it is included in the range.

  For example, in the above embodiment, the radiation conductor 250 formed on the printed circuit board 200 includes two branch patterns 251 and 252. However, the number of branch patterns is not limited to two, and three or more. You may have the following branch pattern. Since the equivalent radiation conductor width increases as the number of branch patterns increases, it is possible to realize a wider band.

  Moreover, in the said embodiment, although the 1st branch pattern 251 is formed in the surface (mounting surface of an antenna block) of the printed circuit board 200, and the 2nd branch pattern 252 is formed in the back surface of the printed circuit board 200, these Are formed on different wiring layers, the formation surfaces need not be the front and back surfaces of the printed circuit board 200. Therefore, when the printed board has a multilayer structure, a part or all of the branch pattern may be formed in the inner layer of the printed board.

  Moreover, in the said embodiment, although the 1st branch pattern 251 and the 2nd branch pattern 252 are connected by one through-hole electrode 253, as shown in FIG. You can connect.

  Moreover, in the said embodiment, although a part of 1st and 2nd branch pattern 251 and 252 has overlapped by planar view, it is not essential to overlap these in this invention. However, if it is formed so that at least a part of them overlaps in plan view, the clearance area can be reduced in size.

  Moreover, in the said embodiment, although the 2nd branch pattern 252 and the antenna mounting area | region 211 do not have overlap by planar view, this point is not essential in this invention. Therefore, as long as the antenna characteristics due to the overlap between them are in an allowable range, a part of them may be overlapped in plan view.

  Furthermore, in the said embodiment, although the 2nd branch pattern 252 has a taper shape, and thereby the conductor width of the 2nd branch pattern 252 is set wider than the 1st branch pattern 251, The present invention is not limited to this. Therefore, the first branch pattern 251 and the second branch pattern 252 may have the same conductor width. Even when the conductor width of the second branch pattern 252 is increased, it is not essential to have a tapered shape.

  Further, the configuration of the mounted antenna block 100 is not limited to the configuration of the above embodiment. Therefore, the base body does not need to be a rectangular parallelepiped shape, and does not need to be a capacitively coupled antenna block with a gap.

  Further, in the above embodiment, the case where the three directions around the antenna mounting area 211 are surrounded by the ground pattern 220 has been described. However, the present invention is not limited to such a case. For example, the antenna mounting area The two directions of the antenna mounting region 211 may be surrounded by the ground pattern 220 by providing 211 at the corners of the printed circuit board 200. In this case, the other two directions are the peripheral portions of the printed circuit board 200, which are regions where no ground pattern exists.

In the above embodiment, a dielectric is used as the material of the base 110. However, a magnetic material having dielectricity may be used in addition to the dielectric. 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.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

First, an antenna block having the same configuration as the antenna block 100 shown in FIG. 2 was prepared. The base material is ceramic mainly composed of 2MgO—SiO 2 , the length (length in the A direction) is 3.2 mm, the width (length in the B direction) is 1.6 mm, and the height (C The direction length was set to 1.1 mm.

  Example antennas # 1 to # 3 were produced by mounting this antenna block on a printed circuit board similar to the printed circuit board 200 shown in FIGS. The conductor width w1 of the first branch pattern 251 and the maximum conductor width w2 of the second branch pattern 252 were set as shown in Table 1 in each of the example samples # 1 to # 3.

  As shown in Table 1, in Example Sample # 1, w1 = w2, that is, the first branch pattern 251 and the second branch pattern 252 have the same conductor width. On the other hand, in the example samples # 2 and # 3, the second branch pattern 252 has a tapered shape, and in the example sample # 2, the conductor width is doubled from the branch point toward the end. In Example Sample # 3, the conductor width is expanded four times from the branch point toward the end.

  Furthermore, a printed circuit board from which the second branch pattern 252 (and the through-hole electrode 253) was deleted was prepared, and the antenna block was mounted on the printed circuit board to produce a comparative example sample. The conductor width w1 of the first branch pattern 251 was set to 0.7 mm as in the example samples # 1 to # 3.

  Next, the antenna devices of the example samples # 1 to # 3 and the comparative example sample were connected to the input / output circuit, and the voltage standing wave ratio (VSWR) of each sample was measured. The measurement results are shown in FIG. The voltage standing wave ratio indicates that the smaller the value, the lower the loss due to reflection at the frequency.

  As shown in FIG. 7, it is confirmed that each of the example samples # 1 to # 3 having the second branch pattern 252 can obtain a wider band than the comparative example sample not having the second branch pattern 252. It was done. It was also confirmed that the bands of the example samples # 1 to # 3 were broadened as the conductor width of the second branch pattern 252 was increased.

1 is a schematic perspective view showing a configuration of an antenna device 10 according to a preferred embodiment of the present invention. 1 is a schematic perspective view showing a configuration of an antenna block 100. FIG. 2 is a development view of the antenna block 100. FIG. 2 is a schematic plan view showing a pattern layout on the surface of a printed circuit board 200. FIG. It is a schematic plan view showing the pattern layout on the back surface of the printed circuit board 200, and particularly shows a state seen transparently from the front surface side. It is a schematic perspective view which shows the structure of the antenna apparatus by a modification. It is a graph which shows the voltage standing wave ratio (VSWR) of Example sample # 1- # 3 and a comparative example sample.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antenna apparatus 100 Antenna block 110 Base | substrate 111 Base | substrate upper surface 112 Base | substrate bottom surface 113 Base | substrate 1st side surface 114 Base | substrate 2nd side surface 115 Base | substrate 3rd side surface 116 Base | substrate 4th side surface 120-125 Conductor pattern 200 Printed circuit board 210, 270 Clearance area 211 Antenna mounting area 212 Projection area 220, 280 Ground pattern 220a, 220b, 220c, 280a, 280b, 280c Edge line 231 First land pattern 232 Second land pattern 240 Feed conductor 250 Radiation conductor 251 First branch pattern 252 Second branch pattern 253 Through-hole electrodes 261, 262 Open region G Gap

Claims (7)

  1. An antenna device comprising an antenna block having at least one conductor pattern and a printed circuit board on which the antenna block is mounted,
    The printed circuit board has a feed conductor and a radiation conductor connected via the antenna block,
    The feeding conductor is connected to one end of the conductor pattern,
    The radiation conductor includes first and second branch patterns formed on different wiring layers of the printed circuit board ,
    The first branch pattern is formed on a mounting surface of the antenna block,
    The second branch pattern is formed on the back surface of the mounting surface,
    One end of the first branch pattern is connected to the other end of the conductor pattern,
    The other end of the first branch pattern is connected to a ground pattern formed on the mounting surface,
    One end of the second branch pattern is connected to the first branch pattern via at least one through-hole electrode that penetrates the printed circuit board,
    The other end of the second branch pattern is connected to a ground pattern formed on the back surface of the mounting surface,
    The first branch pattern has a constant conductor width from the one end toward the other end,
    The antenna device according to claim 2, wherein the second branch pattern has a tapered shape in which a conductor width increases from the one end toward the other end .
  2. The antenna device according to claim 1, wherein the second branch pattern does not overlap with an antenna mounting area, which is a mounting area of the antenna block, in plan view.
  3. The antenna mounting region is provided in a clearance region in which the three surrounding directions are surrounded by the ground pattern and the remaining one direction coincides with the peripheral edge of the printed circuit board.
    The antenna device according to claim 2, wherein a position of the first branch pattern is closer to the peripheral portion of the printed circuit board than the antenna mounting region.
  4. 4. The antenna device according to claim 1 , wherein at least a part of the first and second branch patterns overlap in a plan view. 5.
  5. 5. The antenna device according to claim 1 , wherein at least a part of the first branch pattern extends in parallel with a longitudinal direction of the antenna block.
  6. 6. The antenna device according to claim 1, wherein one end of the second branch pattern is connected to the first branch pattern via a plurality of through-hole electrodes.
  7.   The antenna block has a first conductor pattern connected to the feeding conductor and a second conductor pattern connected to the radiation conductor, and the first and second conductor patterns have a gap. The antenna device according to any one of claims 1 to 6, wherein the antenna device faces each other.
JP2007134909A 2007-05-22 2007-05-22 Antenna device Expired - Fee Related JP4867787B2 (en)

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