JP6134915B2 - ANTENNA DEVICE AND ELECTRONIC DEVICE - Google Patents

Description

  The present disclosure relates to an antenna device and an electronic apparatus including the antenna device.

  2. Description of the Related Art Electronic devices that receive wireless signals using wireless communication and perform signal processing on the received wireless signals have become widespread. Antenna devices that receive radio signals have been proposed in various shapes and arrangements (see, for example, Patent Document 1).

JP 2004-241803 A

  The smaller the size of the electronic device, the more limited the size of the antenna device. As a result, the antenna sensitivity of the antenna device decreases.

  The antenna device according to the present disclosure includes a ground upper layer substrate of a dielectric substrate that forms a first ground portion and a second ground portion disposed at a predetermined interval from the first ground portion, and a third ground. A ground lower layer substrate of a dielectric substrate forming a fourth ground portion arranged at a predetermined distance from the first ground portion and a third ground portion; and an inner layer substrate of a dielectric substrate forming a fifth ground portion; . Then, the ground upper layer substrate, the inner layer substrate, and the lower layer substrate are laminated in this order, the first ground portion and the third ground portion are electrically connected, and the second ground portion and the fourth ground portion are Electrically connected. The antenna device of the present disclosure is further disposed on the ground upper layer substrate, and electrically adjusts the chip antenna that transmits and receives radio waves, the first ground portion, and the second ground portion, and adjusts the antenna characteristics. And parts.

  The present disclosure provides an antenna device that maintains high antenna sensitivity of an antenna device even when the size of the electronic device is small, and an electronic device including the antenna device.

FIG. 1 is a perspective view of the electronic apparatus according to the first embodiment. FIG. 2 is a block diagram of the electronic apparatus according to the first embodiment. FIG. 3 is a perspective view of the antenna device according to the first embodiment. FIG. 4 is a schematic diagram of the antenna device according to the first embodiment. FIG. 5 is a top view of the antenna device according to the first embodiment. FIG. 6 is a graph showing the vertically polarized antenna characteristics of the antenna device according to the first embodiment. FIG. 7 is a graph showing the antenna characteristics of the horizontally polarized wave of the antenna device according to the first embodiment. FIG. 8 is a graph showing another antenna characteristic of the vertically polarized wave of the antenna device according to the first embodiment. FIG. 9 is a graph illustrating another antenna characteristic of horizontal polarization of the antenna device according to the first exemplary embodiment. FIG. 10 is a graph showing the transmission voltage of the electronic device according to the first embodiment and the transmission voltage of the conventional electronic device.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.
(Embodiment 1)
The smaller the size of the electronic device, the more limited the size of the antenna device. As a result, the antenna sensitivity of the antenna device decreases.

  Furthermore, if the ground of the antenna device is shared with the ground of another circuit, the antenna sensitivity of the antenna device is reduced.

  The present disclosure provides an antenna device that maintains the antenna sensitivity of the antenna device at a high gain even when the size of the electronic device is small.

  Hereinafter, Embodiment 1 will be described with reference to FIGS.

  FIG. 1 is a perspective view of the electronic apparatus according to the first embodiment. The size of the electronic device of this embodiment is, for example, 13 inches. As shown in FIG. 1, an electronic device 100 includes an LCD (Liquid Crystal Display) panel 102 housed in an exterior case including a front panel 101 and a back cover (not shown). The antenna device 103 according to the present embodiment is housed in the lower part of the LCD panel 102 inside the exterior case.

  FIG. 2 is a block diagram of the electronic apparatus according to the first embodiment. The electronic device 100 includes an LCD panel 102, an antenna device 103, a power supply circuit 104, a wireless communication circuit 105, and a drive circuit 106.

  The antenna device 103 receives a wireless signal defined by Bluetooth (registered trademark), which is one of wireless communication standards, for example.

  The power supply circuit 104 supplies a power supply voltage to the LCD panel 102, the antenna device 103, the wireless communication circuit 105, and the drive circuit 106.

  The wireless communication circuit 105 performs predetermined signal processing on the wireless signal received by the antenna device 103.

  The drive circuit 106 drives the LCD panel 102 and displays a video signal on the LCD panel 102.

  FIG. 3 is a perspective view of the configuration of the antenna device according to the first embodiment. As shown in FIG. 3, the antenna device 103 is a multilayer substrate in which six dielectric substrates 200 are stacked, and a gap between two adjacent dielectric substrates 200 is filled with a dielectric 300. Here, each layer of the multilayer substrate is defined as a first layer, a second layer,..., A sixth layer from the top. Each of the first layer, the second layer, the fifth layer, and the sixth layer forms one layer with two dielectric substrates 200. A chip antenna 220 that transmits and receives radio waves is disposed on the first-layer dielectric substrate 200. Further, adjustment components 230 and 231 are arranged on the first-layer dielectric substrate 200.

  FIG. 4 is a schematic diagram of the antenna device according to the first embodiment. In FIG. 4, the dielectric 300 is removed from the antenna device 103 of FIG. 3 in order to explain the structure of the antenna device 103 in detail. As shown in FIG. 4, the multilayer substrate of the antenna device 103 includes a ground upper layer substrate 260 composed of dielectric substrates 201, 202, 203, and 204, an inner layer substrate 261 composed of dielectric substrates 209 and 210, and a dielectric material. It is composed of a ground lower layer substrate 262 composed of substrates 205, 206, 207 and 208.

  The dielectric substrate 201 is formed with a non-ground portion 201a and a first ground portion 201b.

  A second ground portion 202 b is formed on the dielectric substrate 202.

  The dielectric substrate 203 is formed with a non-ground portion 203a and a first ground portion 203b.

  A second ground portion 204b is formed on the dielectric substrate 204.

  The dielectric substrate 205 is formed with a non-ground portion 205a and a third ground portion 205b.

  A fourth ground portion 206 b is formed on the dielectric substrate 206.

  The dielectric substrate 207 is formed with a non-ground portion 207a and a third ground portion 207b.

  On the dielectric substrate 208, a fourth ground portion 208b is formed.

  The dielectric substrate 209 is formed with a non-ground portion 209a and a fifth ground portion 209b.

  The dielectric substrate 210 has a non-ground portion 210a and a fifth ground portion 210b.

  The chip antenna 220 is disposed on the non-ground portion 201a.

  The non-ground portions 201a, 203a, 209a, 210a, 205a, and 207a are formed so that the positions on the horizontal plane, that is, the xy positions in FIG. 4 are the same.

  The adjustment components 230 and 231 connect the first ground part 201b and the second ground part 202b, respectively. The adjustment components 230 and 231 are configured by coils, capacitors, resistors, beads, and the like. The components of the adjustment components 230 and 231 are selected according to the desired frequency and antenna characteristics of the antenna device 103.

  The first ground parts 201b and 203b and the third ground parts 205b and 207b are electrically connected via vias (VIA) 241 and 242, respectively.

  The second ground portions 202b and 204b and the fourth ground portions 206b and 208b are electrically connected via vias 243 and 244, respectively.

  In the fifth ground portion 209b, four through holes 251 are formed in order to penetrate the vias 241, 242, 243, and 244, respectively.

  The ground upper layer substrate 260 and the ground lower layer substrate 262 are used for the ground of the chip antenna 220, and the inner layer substrate 261 is used for the ground of the wireless communication circuit 105 that is a circuit other than the antenna device 103. With this configuration, the ground of the antenna device 103 and the ground of another circuit can be separated without being shared.

  Next, adjustment of antenna characteristics of the antenna device 103 will be described. FIG. 5 is a top view of the antenna device according to the first embodiment.

  As shown in FIG. 5, the length in the longitudinal direction of the first ground portion 201b is a length L. That is, the length L is the length from the feeding point 250 at the boundary position between the non-ground portion 201a and the first ground portion 201b to the edge portion 201c on the opposite side of the dielectric substrate 201.

  Adjustment of the antenna characteristics of the antenna device 103 is performed by adjusting the component configuration of the adjustment components 230 and 231 and the length L.

  Here, the length L2 of the second ground portion 202b is preferably λ / 4 ≦ L2 ≦ λ / 16.

  Next, the adjustment of the length L will be described with reference to FIGS. Let λ be the wavelength of a signal received by the antenna device 103. The antenna characteristics of the antenna device 103 were measured when the length L was λ / 2 and λ / 4. 6 and 7 are diagrams illustrating antenna characteristics when the length L is λ / 2, and FIGS. 8 and 9 are diagrams illustrating antenna characteristics when the length L is λ / 4. 6 and 8 are graphs showing the antenna characteristics of the antenna device 103 with respect to vertical polarization, and FIGS. 7 and 9 are graphs showing the antenna characteristics of the antenna device 103 with respect to horizontal polarization. 6-9, the frequency of the antenna apparatus 103 is 9 types of frequency between 2400 MHz-2480 MHz with a 10-MHz space | interval. 6 to 9, the vertical axis and the horizontal axis indicate gain (dBd) which is the intensity of energy at the radiation angle.

  The antenna characteristics of the vertically polarized wave of the antenna device 103 do not change greatly between FIGS. However, the antenna characteristics of the horizontally polarized wave of the antenna device 103 vary greatly between FIGS. In front of the antenna device 103, the gain when the length L in FIG. 9 is λ / 4 is higher than the gain when the length L in FIG. 7 is λ / 2. Therefore, the antenna characteristics are improved by setting the length L to λ / 4.

  Next, the transmission voltage of the electronic device 100 was measured. FIG. 10 is a graph showing the transmission voltage of electronic device 100 of the present embodiment and the transmission voltage of a conventional electronic device. FIG. 10 shows a case where the frequency is 2450 MHz. If the frequency is between 2400 MHz and 2480 MHz, the result is almost the same as the result when the frequency is 2450 MHz. In FIG. 10, a result 1001 indicates the transmission voltage of the electronic device 100 of the present embodiment, and a result 1002 indicates the transmission voltage of the conventional electronic device. In FIG. 10, the transmission voltage of the result 1001 is improved compared to the transmission voltage of the result 1002 with respect to the front of the electronic device. Moreover, since it has reversibility, the reception sensitivity of the electronic device 100 is also improved.

  As described above, the antenna device according to the present disclosure includes a ground upper layer substrate of a dielectric substrate that forms a first ground portion and a second ground portion disposed at a predetermined interval from the first ground portion. A ground lower layer substrate of a dielectric substrate forming a third ground portion and a fourth ground portion arranged at a predetermined interval from the third ground portion, and a dielectric forming a fifth ground portion An inner layer substrate of the substrate. Then, the ground upper layer substrate, the inner layer substrate, and the lower layer substrate are laminated in this order, the first ground portion and the third ground portion are electrically connected, and the second ground portion and the fourth ground portion are Electrically connected. The antenna device of the present disclosure is further disposed on the ground upper layer substrate, and electrically adjusts the chip antenna that transmits and receives radio waves, the first ground portion, and the second ground portion, and adjusts the antenna characteristics. And parts.

  With this configuration, it is possible to provide an antenna device in which the antenna sensitivity of the antenna device can maintain a high gain even when the size of the electronic device is small.

  In the present embodiment, the antenna device 103 is described as a multilayer substrate in which six dielectric substrates 200 are stacked. However, the present invention is not limited to this. Further, although the ground upper layer substrate 260, the inner layer substrate 261, and the ground lower layer substrate 262 of the antenna device 103 are each constituted by two layers of dielectric substrates, the present invention is not limited to this. Each of them may be composed of at least one dielectric substrate.

  In the present embodiment, the number of vias is four, but the present invention is not limited to this.

  The present disclosure is applicable to an electronic device that receives a radio signal and performs signal processing on the received radio signal. Specifically, the present invention can be applied to portable television broadcast receivers, mobile phones, smartphones, seat monitors, and the like.

DESCRIPTION OF SYMBOLS 100 Electronic device 101 Front panel 102 LCD panel 103 Antenna apparatus 104 Power supply circuit 105 Wireless communication circuit 106 Drive circuit 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210 Dielectric substrate Ground part 201b, 203b First ground portion 202b, 204b Second ground portion 205b, 207b Third ground portion 206b, 208b Fourth ground portion 209b, 210b Fifth ground portion 201a, 203a, 205a, 207a, 209a, 210a Ground part 220 Chip antenna 230, 231 Adjustment component 241, 242, 243, 244 Via 251 Through hole 260 Ground upper layer substrate 261 Inner layer substrate 262 Ground lower layer substrate 1001, 1002 Result

Claims (3)

An upper ground substrate of a dielectric substrate forming a first ground portion and a second ground portion disposed at a predetermined interval from the first ground portion;
A ground lower layer substrate of a dielectric substrate forming a third ground portion and a fourth ground portion disposed at a predetermined interval from the third ground portion;
An inner substrate of a dielectric substrate forming a fifth ground portion;
The ground upper layer substrate, the inner layer substrate, the lower layer substrate are stacked in this order,
The first ground part and the third ground part are electrically connected,
The second ground part and the fourth ground part are electrically connected,
A chip antenna disposed on the ground upper layer substrate for transmitting and receiving radio waves;
An antenna device comprising: an adjustment component that electrically connects the first ground portion and the second ground portion and adjusts antenna characteristics.   2. The antenna device according to claim 1, wherein a length of the first ground portion in a longitudinal direction is ¼ of a wavelength of a radio wave received by the chip antenna. The antenna device according to claim 1, which transmits and receives a radio signal;
An electronic device comprising: a wireless communication circuit that performs predetermined signal processing on the wireless signal.

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