WO2015029235A1 - アンテナ装置 - Google Patents
アンテナ装置 Download PDFInfo
- Publication number
- WO2015029235A1 WO2015029235A1 PCT/JP2013/073404 JP2013073404W WO2015029235A1 WO 2015029235 A1 WO2015029235 A1 WO 2015029235A1 JP 2013073404 W JP2013073404 W JP 2013073404W WO 2015029235 A1 WO2015029235 A1 WO 2015029235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- antenna device
- ground electrode
- dielectric layer
- power feeding
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present invention relates to an antenna device, for example.
- a plate-like inverted F antenna has been proposed as an antenna suitable for portable wireless devices such as cellular phones.
- a slot that operates as an antenna is formed between two portions of the ground electrode.
- the antenna element is connected to one of the two parts of the ground electrode through one terminal and is fed through the terminal, and the other of the two parts of the ground electrode through the other terminal. Grounded.
- the specific absorption rate is specified to be 1.6 W / kg or less for wireless devices such as tablet PCs.
- the Ordinance of the Ministry of Internal Affairs and Communications requires that local SAR does not exceed 2 W / kg for devices such as mobile phones.
- the casing of the wireless device on which the antenna is mounted is thin.
- an object of the present specification is to provide an antenna device capable of reducing SAR.
- an antenna device includes a ground electrode, a first dielectric layer provided on one surface of the ground electrode, and a surface opposite to the surface on the ground electrode side of the first dielectric layer, and is short-circuited with the ground electrode.
- a conductive plate, a power supply line for supplying power to the power supply plate, a second dielectric layer provided so as to sandwich the power supply plate together with the first dielectric layer, and a power supply plate side of the second dielectric layer A radiation electrode that is provided on a surface opposite to the surface and that is fed by being electrically connected to a power feeding plate at a feeding point to emit or receive a radio wave of a first frequency.
- the antenna device disclosed in this specification can reduce SAR.
- FIG. 1A is a perspective view of an antenna device according to one embodiment as viewed from above.
- FIG. 1B is a perspective view of the antenna device shown in FIG. 1A as viewed from below.
- FIG. 2A is a transparent perspective view showing each electrode of the antenna device shown in FIG. 1A.
- 2B is a transparent side view showing each electrode of the antenna device shown in FIG. 1A.
- 2C is a transparent front view showing each electrode of the antenna device shown in FIG. 1A.
- FIG. 3 is a plan view of the antenna device showing the shape of the radiation electrode.
- FIG. 4 is a perspective view showing the surface of the lower dielectric layer.
- FIG. 5A is a plan view of the ground electrode.
- FIG. 5B is a perspective view of the ground electrode.
- FIG. 5A is a plan view of the ground electrode.
- FIG. 6 is a plan view showing the outer dimensions of the antenna device and the dimensions of the radiation electrode.
- FIG. 7 is a plan view showing dimensions of the ground electrode.
- FIG. 8 is a perspective view of the antenna device showing the size of each part in the vertical direction.
- FIG. 9 is a perspective view of the antenna device showing the size of the power feeding plate.
- FIG. 10A is a diagram illustrating an arrangement of a phantom and a wireless device corresponding to a case where a wireless device on which an antenna device is mounted is placed on a knee.
- FIG. 10B is a diagram illustrating an arrangement of the phantom and the wireless device corresponding to a case where the wireless device having the antenna device mounted thereon is disposed on the abdomen.
- FIG. 10A is a diagram illustrating an arrangement of a phantom and a wireless device corresponding to a case where a wireless device on which an antenna device is mounted is placed on a knee.
- FIG. 10B is a diagram illustrating an arrangement of
- FIG. 11 shows a table showing the analysis results of the SAR and radiation efficiency of the antenna device.
- FIG. 12 is a schematic side view of a ground electrode according to a modification.
- FIG. 13 is a diagram illustrating an example of the arrangement of the antenna device according to the above-described embodiment or modification in a wireless device.
- This antenna device has a power feeding plate between a ground electrode and a radiation electrode, and the radiation electrode is fed through the power feeding plate. As a result, a part of the radio wave radiated from the radiation electrode is blocked by the power supply plate or the ground electrode, thereby reducing the SAR of the human body located on the ground electrode side. Further, in this antenna device, the ground electrode is provided with a slit that operates as an antenna, and a part of the ground electrode is bent away from the radiation electrode, and is grounded through the bent portion. As a result, this antenna device reduces the SAR by providing a certain distance between the ground electrode and the human body and reducing absorption by the human body of radio waves radiated from the ground electrode.
- FIG. 1A is a perspective view of an antenna device according to an embodiment as viewed from above.
- FIG. 1B is a perspective view of the antenna device shown in FIG. 1A as viewed from below.
- FIG. 2A is a transparent perspective view showing each electrode of the antenna device shown in FIG. 1A.
- 2B is a transparent side view showing each electrode of the antenna device shown in FIG. 1A.
- 2C is a transparent front view showing each electrode of the antenna device shown in FIG. 1A.
- a plane parallel to the surface of the radiation electrode 2 is referred to as a horizontal plane.
- the direction orthogonal to the horizontal plane is defined as the vertical direction of the antenna device 1 and the ground electrode is located on the lowermost side.
- the antenna device 1 includes, in order from the top, a radiation electrode 2, an upper dielectric layer 3, a feeder plate 4, a lower dielectric layer 5, and a ground. And an electrode 6. Furthermore, the antenna device 1 has a feeder 7 that is connected to a communication circuit (not shown) that feeds power to the feeder plate 4 and communicates with other devices by radio waves radiated or received from the antenna device 1.
- the antenna device 1 is arranged with respect to a wireless device such as a tablet PC so that the ground electrode 6 faces the bottom surface of the housing of the wireless device and the radiation electrode 2 faces the top surface of the housing. .
- the radiation electrode 2, the power supply plate 4, and the ground electrode 6 are formed of, for example, a metal such as aluminum, copper, gold, silver, nickel, an alloy thereof, or other conductive material.
- the upper dielectric layer 3 and the lower dielectric layer 5 are formed of, for example, FR4 or other dielectric material. Note that the dielectric forming the upper dielectric layer 3 and the dielectric forming the lower dielectric layer 5 may be the same or different from each other. Further, the higher the relative dielectric constant of the dielectric forming the upper dielectric layer 3, the thinner the upper dielectric layer 3, that is, the shorter the distance between the radiation electrode 2 and the power feeding plate 4. Similarly, the higher the relative dielectric constant of the dielectric forming the lower dielectric layer 5, the thinner the lower dielectric layer 5, that is, the shorter the distance between the power feeding plate 4 and the ground electrode 6.
- FIG. 3 is a plan view of the antenna device 1 showing the shape of the radiation electrode 2.
- Radiation electrode 2 is provided on the upper surface of the upper dielectric layer 3, it emits or receives the electric wave having a first resonance frequency f 1. Therefore, the radiation electrode 2 can be resonated with a radio wave having the first resonance frequency f 1 from the feed point 2a connected to the via 3a formed in the upper dielectric layer 3 to the tip 2b of the radiation electrode 2. Is formed to be 1/4 of the wavelength ⁇ 1 corresponding to the first resonance frequency f 1 .
- the radiation electrode 2 is formed in a substantially U shape in order to reduce the size of the antenna device 1 in the horizontal plane.
- the upper dielectric layer 3 is arranged so that its upper surface is in contact with the radiation electrode 2 and its bottom surface is in contact with the upper surface of the power supply plate 4.
- the upper dielectric layer 3 supports the radiation electrode 2.
- Two vias 3 a are formed in the upper dielectric layer 3, and the radiation electrode 2 and the power feeding plate 4 are electrically connected via the via 3 a, and the radiation electrode 2 is connected to the via from the power feeding plate 4. Power is supplied through 3a.
- FIG. 4 is a perspective view showing the surface of the lower dielectric layer 5.
- the lower dielectric layer 5 is disposed such that the upper surface thereof is in contact with the power feeding plate 4 and the bottom surface thereof is in contact with the upper surface of the ground electrode 6. That is, the upper dielectric layer 3 and the lower dielectric layer 5 support the power supply plate 4 so as to be substantially parallel to the radiation electrode 2 with the power supply plate 4 interposed therebetween.
- the upper dielectric layer 3 and the lower dielectric layer 5 are fixed by, for example, resin screws. Alternatively, the upper dielectric layer 3 and the lower dielectric layer 5 may be fixed by being bonded to each other.
- the lower dielectric layer 5 is formed so as not to cover the slit 6c formed in the ground electrode 6, but the lower dielectric layer 5 includes the slit 6c. You may form so that the whole electrode part 6a may be covered.
- the power feeding plate 4 is a plate-like conductor, is substantially parallel to the radiation electrode 2 and the electrode portion 6 a of the ground electrode 6 between the radiation electrode 2 and the ground electrode 6, and extends in the longitudinal direction of the radiation electrode 2. It arrange
- the power feeding plate 4 is short-circuited to the ground electrode 6 via the short pin 6 b of the ground electrode 6. Further, the power feeding plate 4 is fed from the feeding line 7 at a feeding point 4a at a position different from the position where the short pin 6b contacts. Furthermore, the power feeding plate 4 is electrically connected to the radiation electrode 2 through two vias 3 a formed in the upper dielectric layer 3. Thereby, the radiation electrode 2 is fed via the feed plate 4 and the feed line 7.
- the number of vias 3a is not limited. For example, the number of vias 3a may be one or three.
- the contact point between the via 3 a, the short pin 6 b, and the power supply plate 4 is separated by a predetermined distance along the short direction of the power supply plate 4.
- the via 3 a and the feeding point 4 a are separated by a predetermined distance along the longitudinal direction of the feeding plate 4.
- the distance between the contact point and the vias 3a and the distance between the feeding points 4a and vias 3a are respectively set according to the resonance frequency f 1 of the radiation electrode 2.
- Higher resonance frequency f 1 is low and a long distance between the feeding points 4a and vias 3a.
- FIG. 5A is a plan view of the ground electrode 6, and FIG. 5B is a perspective view of the ground electrode 6.
- the ground electrode 6 is formed of sheet metal, for example, in order to maintain sufficient strength.
- the ground electrode 6 functions as a conductor that is grounded to the radiation electrode 2 serves to emit or receive radio waves having a second resonant frequency f 2.
- the ground electrode 6 includes an electrode portion 6a and a ground portion 6d.
- the electrode portion 6 a of the ground electrode 6 is disposed so as to be in contact with the bottom surface of the lower dielectric layer 5 so as to be substantially parallel to the radiation electrode 2 and the power feeding plate 4.
- the short pin 6b which protruded upwards is formed in the electrode part 6a.
- a slit 6 c is formed in the electrode portion 6 a of the ground electrode 6.
- the slit 6c is arranged so that the longitudinal direction of the slit 6c and the longitudinal direction of the radiation electrode 2 substantially coincide so that a part of the radio wave from the radiation electrode 2 can pass.
- the slits 6c operates a radio wave having a second resonance frequency f 2 as an antenna for radiating or receiving.
- the slit 6c is formed so that the diagonal length of the slit 6c is 1/4 of the second wavelength ⁇ 2 corresponding to the second resonance frequency f 2 .
- the ground electrode 6 is connected to the power supply line 7 and is supplied with power from the power supply line 7.
- the feeder 7 is in contact with the ground electrode 6 at a position where the impedance of the antenna through the slit 6c becomes a predetermined value (for example, 50 ⁇ ).
- the ground portion 6d of the ground electrode 6 is bent at a substantially right angle toward the lower side so as to be separated from the radiation electrode 2.
- the ground portion 6d is substantially perpendicular to the bottom surface of the antenna device 1 so as to be in contact with a conductive portion that is electrically connected to a sheet metal serving as a ground electrode of the entire housing of the wireless device on which the antenna device 1 is mounted. It is bent. Therefore, the distance from the slit 6c to the bottom surface of the housing is increased. As a result, the absorption of radio waves radiated from the slit 6c and the grounding portion 6d by the human body at a position in contact with the bottom surface of the wireless device is reduced, so that the antenna device 1 can reduce SAR.
- the ground electrode 6 is formed such that the width of the conductor forming the electrode portion 6 a of the ground electrode 6 is wider than the width of the radiation electrode 2.
- the power feeding plate 4 and the ground electrode 6 are arranged so that at least a part of the power feeding plate 4 overlaps the slit 6c.
- the radiation electrode 2, the power supply plate 4, and the ground electrode 6 are arranged so that the radiation electrode 2 substantially overlaps the ground electrode 6 or the power supply plate 4 when the radiation electrode 2, the power supply plate 4 and the ground electrode 6 are projected on the horizontal plane. Be placed.
- the antenna device 1 can reduce SAR.
- the area of the power feeding plate 4 is preferably smaller than the area of the radiation electrode 2.
- the power feeding plate 4 is smaller than the slit 6c, the radiation electrode 2, the power feeding plate 4, and the radiation electrode 2 are not overlapped with the power feeding plate 4 but overlap the slit 6c.
- a ground electrode 6 is disposed. Therefore, a part of the radio wave radiated from the radiation electrode 2 can reach the outside of the antenna device 1 without being blocked by the power supply plate 4 and the ground electrode 6. The deterioration of the radiation characteristics of the antenna device 1 is suppressed.
- the power feeding plate 4 is smaller than the slit 6 c, a part of the radio wave radiated from the slit 6 c can reach the outside of the antenna device 1 without being blocked by the power feeding plate 4. Therefore, by feeding plate 4, the performance degradation of the antenna device 1 of the radio wave having a resonance frequency f 2 of the slit 6c is suppressed.
- FIG. 6 is a plan view showing the outer dimensions of the antenna device 1 and the dimensions of the radiation electrode 2.
- FIG. 7 is a plan view showing dimensions of the ground electrode 6.
- the antenna device 1 has a length of 14.8 mm along the longitudinal direction of the radiation electrode 2 (hereinafter referred to as the x direction) and 11.21 mm along the direction orthogonal to the x direction on the horizontal plane (hereinafter referred to as the y direction). have.
- the length from the feeding point 2a to the left end is 6 mm
- the length of the radiation electrode 2 in the y direction is 4.14 mm.
- the length of the radiation electrode 2 in the x direction is 12.04 mm.
- the length of the tip portion of the radiation electrode 2 in the y direction is 1.7 mm.
- the length of the electrode portion 6a of the ground electrode 6 in the x direction is 14.8 mm, and the length in the y direction is 6.54 mm.
- the length in the x direction of the portion of the electrode portion 6a far from the ground portion 6d is 12.89 mm.
- the narrowest width of the slit 6c is 1.99 mm, and the diagonal length of the slit 6c is 11.4 mm.
- FIG. 8 is a perspective view of the antenna device 1 showing the size of each part in the vertical direction.
- the upper dielectric layer 3 has a thickness of 1.2 mm
- the lower dielectric layer 5 has a thickness of 1.0 mm.
- the relative dielectric constant of the upper dielectric layer 3 is 3.5
- the relative dielectric constant of the lower dielectric layer 5 is 2.9.
- the electrode portion 6a of the ground electrode 6 the length from the end of the lower dielectric layer 5 to the ground portion 6d is 1.7 mm, and the vertical length of the ground portion 6d is 3.76 mm.
- casing has is 4.67 mm.
- FIG. 9 is a perspective view of the antenna device 1 showing the size of the power feeding plate 4.
- the length of the power feeding plate 4 in the x direction is 4.5 mm.
- FIG. 10A is a diagram illustrating an arrangement of the phantom and the wireless device corresponding to a case where the wireless device on which the antenna device 1 is mounted is placed on the knee.
- FIG. 10B is a diagram illustrating an arrangement of the phantom and the wireless device corresponding to the case where the wireless device on which the antenna device 1 is mounted is disposed on the abdomen.
- the antenna device 1 is arranged so that the bottom surface of the wireless device 110 and the ground electrode face each other and is close to one side of the wireless device 110.
- the wireless device 110 is disposed so that the bottom surface of the wireless device 110 on which the antenna device 1 is mounted is in contact with the surface of the phantom 100.
- this arrangement is referred to as horizontal installation for convenience.
- the bottom surface of the wireless device 110 on which the antenna device 1 is mounted is orthogonal to the surface of the phantom 100 and the side on which the antenna device 1 is provided contacts the phantom 100.
- the wireless device 110 is arranged.
- this arrangement is referred to as vertical installation for convenience.
- the relative permittivity of the phantom used for the analysis is 51.2 for 2.3 GHz and 48.7 for 5.5 GHz, and the conductivity is 1.92 [S / m] for 2.3 GHz and 5.5 GHz.
- the density is 5.82 [S / m] and the density is 1000 [kg / m 3 ].
- the input power to the antenna device 1 is 16.0 [dBm] for 2.3 GHz and 17.0 [dBm] for 5.5 GHz.
- FIG. 11 shows a table showing the analysis results of the SAR and radiation efficiency of the antenna device 1 using the Finite-Difference Time-Domain method.
- the SAR is less than 1.6 [w / kg] for both the first resonance frequency of 2.3 GHz and the second resonance frequency of 5.5 GHz for both the vertical placement and the horizontal placement.
- the radiation efficiency of the antenna device 1 is a good value of -3.6 [dB] with respect to the first resonance frequency of 2.3 GHz and -4.0 [dB] with respect to the second resonance frequency of 5.5 GHz.
- the antenna device 1 has sufficient performance for both SAR and radiation efficiency.
- this antenna device a power feeding plate is provided between the radiation electrode and the ground electrode, and the radiation electrode is fed through the power feeding plate, so a part of the radio wave radiated from the radiation electrode Is blocked by the power supply plate or the ground electrode, and as a result, SAR is reduced. Furthermore, in this antenna device, one end of the ground electrode is bent in a direction away from the radiation electrode, that is, on the bottom surface side, and is grounded to the conduction portion of the casing of the wireless device. Therefore, even when a human body is located on the bottom surface side of the housing, this antenna device can make the distance between the human body and the slit functioning as an antenna formed on the ground electrode relatively long, so that radio waves radiated from the slit can be obtained. Can suppress the absorption of the human body. As a result, this antenna device can reduce SAR.
- FIG. 12 is a schematic side view of a ground electrode showing the shape of the ground electrode according to a modification.
- the ground electrode 6 ′ has an electrode portion 6 a ′ that extends along the y-direction compared to the electrode portion 6 a and the ground portion 6 d of the ground electrode 6 indicated by a dotted line.
- the conductive portion 12 connected to the ground electrode extends to the end portion on the housing end side.
- the grounding portion 6d ′ is bent so as to face the end portion of the conducting portion 12 on the housing end side.
- the current path from the slit 6 c formed in the ground electrode 6 ′ to the conducting portion 12 is longer than the path in the above embodiment, so that the current near the conducting portion 12 is reduced. For this reason, electromagnetic waves near the human body located on the bottom surface side of the housing are weakened, and SAR is further reduced.
- the antenna device may radiate or receive only a radio wave having a frequency at which the radiation electrode resonates.
- the distance from the ground electrode to the human body may be shorter than the distance from the ground electrode to the human body in the above embodiment. Therefore, the ground electrode may be formed in a flat plate shape.
- an additional dielectric layer and a radio wave having a third resonance frequency supported by the additional dielectric layer can be radiated or received above the radiation electrode.
- Additional radiation electrodes may be provided. This additional radiation electrode is fed, for example, via a via formed in the same position as the via formed in the second dielectric layer in the additional dielectric layer.
- the antenna device can radiate or receive radio waves of three types of frequencies.
- the additional radiation electrode is arranged so that the additional radiation electrode substantially overlaps the ground electrode or the power supply plate when the additional radiation electrode, the power feeding plate, and the ground electrode are projected onto the horizontal plane. As a result, a part of the radio wave radiated from the additional radiation electrode is blocked by the power supply plate or the ground electrode, so that the antenna device can reduce SAR for the radio wave radiated from the additional radiation electrode.
- the radiation electrode may be formed in a straight line, or may be formed in an S shape or an L shape.
- the electrode portion of the ground electrode also preferably has a shape similar to the shape of the radiation electrode.
- the radiation electrode, the power supply plate, and the ground electrode are arranged so that most of the radiation electrode overlaps the power supply plate or the ground electrode when the radiation electrode, the power supply plate, and the ground electrode are projected onto the horizontal plane. Is preferred. Thereby, a part of the radio wave radiated from the radiation electrode toward the bottom surface side of the antenna device is blocked by the power feeding plate or the ground electrode, so that the SAR of the human body located on the bottom surface side becomes low. In addition, since the other part of the radio wave can reach the outside of the housing in which the antenna device is provided, the antenna device can communicate with a device outside the housing.
- FIG. 13 is a diagram illustrating an example of the arrangement of the antenna device according to the above-described embodiment or modification in a wireless device.
- the antenna device 1 has a housing such that the ground electrode 6 of the antenna device 1 faces the bottom surface 1300 of the rectangular housing of the wireless device and the radiation electrode 2 faces the top surface (not shown) of the housing. Placed inside.
- a user interface such as a touch panel display is arranged to face the upper surface side of the housing. Therefore, in general, wireless devices are used in an arrangement in which a part of a human body (for example, a foot) is located on the bottom surface side of the housing. Note that the bottom and top surfaces of the housing are each formed of a dielectric such as resin.
- the antenna device 1 is arranged so that the bottom surface of the grounding portion of the ground electrode 6 is in contact with the conducting portion 1301 that is electrically connected to the ground electrode (not shown) of the housing itself.
- the ground electrode of the housing itself is preferably arranged away from the antenna device 1 so that the antenna device 1 can receive radio waves from the outside of the housing and transmit radio waves to the outside of the housing.
- the antenna device 1 is preferably disposed, for example, in the vicinity of one end of the casing so that the longitudinal direction of the slit and the radiation electrode is substantially parallel to the end.
- orientation of the antenna device 1 may be determined so that the electrode portion of the ground electrode is closer to the end of the housing than the ground portion, depending on the arrangement of the conducting portion.
- the orientation of the antenna device 1 may be determined so that is closer to the end of the housing than the electrode portion.
- the antenna device 1 may be arranged near any corner of the housing. It should be noted that the current is relatively strong in the vicinity of the feeding point of the radiation electrode, and it is preferable to leave the human body.
- the wireless device when the wireless device is arranged so that the end of the housing in which the antenna device 1 is disposed faces the abdomen of the human body, the cross section of the abdomen of the human body is substantially elliptical. The closer to the position, the farther away from the abdomen. Therefore, for example, when the feed point is closer to the left end than the center in the longitudinal direction of the radiation electrode, the antenna device is arranged so that the feed point of the radiation electrode is as close as possible to the corner of the housing. It is preferable to arrange at the corner at the left end of the housing.
Abstract
Description
上記の一般的な記述及び下記の詳細な記述の何れも、例示的かつ説明的なものであり、請求項のように、本発明を限定するものではないことを理解されたい。
このアンテナ装置は、接地電極と放射電極の間に給電板を有し、放射電極は、その給電板を介して給電される。これにより、放射電極から放射される電波の一部がその給電板または接地電極により遮られることで、接地電極側に位置する人体についてのSARが低減される。さらに、このアンテナ装置では、接地電極に、アンテナとして動作するスリットが設けられるとともに、接地電極の一部が放射電極から離れる方向に折り曲げられ、その折り曲げられた部分を介して接地される。これにより、このアンテナ装置は、接地電極と人体との間に一定の距離を設けて、接地電極から放射される電波の人体による吸収を軽減することで、SARを低減する。
なお、本実施形態では、下側誘電層5は、接地電極6に形成されたスリット6cを覆わないように形成されているが、下側誘電層5は、スリット6cを含む、接地電極6の電極部6a全体を覆うように形成されてもよい。
共振周波数f1が低くなるほど、給電点4aとビア3a間の距離も長くなる。また、ショートピン6bと給電板4の接触点とビア3a間の距離は、共振周波数f1が低くなるほど短くなる。
したがって、接地電極6よりも下方に位置する人体による、放射電極2からの電波の吸収量が軽減される。そのため、アンテナ装置1は、SARを低減できる。
また、接地電極6の電極部6aにおける、下側誘電層5の端部から接地部6dまでの長さは1.7mmであり、接地部6dの鉛直方向の長さは3.76mmである。そして、筐体が有する導体と電気的に接続される、接地部6dの底辺部分のy方向の長さは4.67mmである。
図10Aに示された例では、ファントム100の表面に対して、アンテナ装置1が実装された無線機器110の底面が接するように、無線機器110が配置されている。この配置を、以下では、便宜上横置きと呼ぶ。一方、図10Bに示された例では、ファントム100の表面に対して、アンテナ装置1が実装された無線機器110の底面が直交し、かつ、アンテナ装置1が設けられた辺がファントム100と接するように、無線機器110が配置されている。この配置を、以下では、便宜上縦置きと呼ぶ。
図12は、変形例による、接地電極の形状を示す、接地電極の概略側面図である。図12に示す変形例では、接地電極6’は、点線で示される接地電極6の電極部6a及び接地部6dと比較して、電極部6a’が、y方向に沿って、筐体全体の接地電極(図示せず)と接続される導通部12の筐体端側の端部まで延伸されている。そして接地部6d’は、その導通部12の筐体端側の端部に向かうように折り曲げられる。これにより、接地電極6’に形成されるスリット6cから導通部12までの電流の経路が、上記の実施形態における経路よりも長くなるので、導通部12付近での電流が小さくなる。そのため、筐体の底面側に位置する人体付近での電磁波が弱くなるので、SARがより低減される。
このように、追加の放射電極を設けることにより、アンテナ装置は、3種類の周波数の電波を放射または受信できる。また、追加の放射電極、給電板及び接地電極を水平面に投影したときに、追加の放射電極が、接地電極または給電板とほぼ重なるように、追加の放射電極は配置されることが好ましい。これにより、追加の放射電極から放射される電波の一部が給電板または接地電極により遮られるので、アンテナ装置は、追加の放射電極から放射される電波についてもSARを低減できる。
2 放射電極
2a 給電点
2b 放射電極先端
3 上側誘電層(第2の誘電層)
3a ビア
4 給電板
4a 給電点
5 下側誘電層(第1の誘電層)
6、6’ 接地電極
6a、6a’ 電極部
6b ショートピン
6c スリット
6d、6d’ 接地部
7 給電線
12 導通部
1300 筐体底面
1301 導通部
Claims (7)
- 接地電極と、
前記接地電極の一方の面に設けられた第1の誘電層と、
前記第1の誘電層の前記接地電極側の面と反対側の面に設けられ、前記接地電極と短絡された導体である給電板と、
前記給電板に給電する給電線と、
前記第1の誘電層とともに前記給電板を挟むように設けられた第2の誘電層と、
前記第2の誘電層の前記給電板側の面と反対側の面に設けられ、給電点にて前記給電板と電気的に接続されることにより給電されて第1の周波数の電波を放射または受信する放射電極と、
を有するアンテナ装置。 - 前記給電板を前記放射電極の表面に投影したときに、前記給電点と前記給電板が重なるように前記放射電極及び前記給電板が配置される、請求項1に記載のアンテナ装置。
- 前記給電板の面積は、前記放射電極の面積よりも小さい、請求項1または2に記載のアンテナ装置。
- 前記第1の誘電層には前記放射電極の前記給電点と接する位置にビアが形成され、該ビアを介して前記給電板から前記放射電極に給電され、
前記ビアから前記給電板が前記接地電極と短絡される位置までの距離及び前記ビアから前記給電板が前記給電線に接続される位置までの距離は、前記第1の周波数に応じて設定される、請求項1~3の何れか一項に記載のアンテナ装置。 - 前記接地電極にはスリットが形成される、請求項1~4の何れか一項に記載のアンテナ装置。
- 前記給電板及び前記接地電極を前記放射電極の表面に投影したときに、前記給電板の少なくとも一部が前記スリットと重なるように前記給電板及び前記接地電極が配置される、請求項5に記載のアンテナ装置。
- 前記スリットは第2の周波数の電波を放射または受信し、
前記スリットが形成されていない前記接地電極の一端は、前記放射電極から離れる方向に折り曲げられ、かつ、前記接地電極は当該一端において接地される、請求項5または6に記載のアンテナ装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/073404 WO2015029235A1 (ja) | 2013-08-30 | 2013-08-30 | アンテナ装置 |
JP2015533905A JP6079886B2 (ja) | 2013-08-30 | 2013-08-30 | アンテナ装置 |
EP13892395.8A EP3041088B1 (en) | 2013-08-30 | 2013-08-30 | Antenna device |
US15/054,406 US9905917B2 (en) | 2013-08-30 | 2016-02-26 | Antenna device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/073404 WO2015029235A1 (ja) | 2013-08-30 | 2013-08-30 | アンテナ装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/054,406 Continuation US9905917B2 (en) | 2013-08-30 | 2016-02-26 | Antenna device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015029235A1 true WO2015029235A1 (ja) | 2015-03-05 |
Family
ID=52585844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/073404 WO2015029235A1 (ja) | 2013-08-30 | 2013-08-30 | アンテナ装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9905917B2 (ja) |
EP (1) | EP3041088B1 (ja) |
JP (1) | JP6079886B2 (ja) |
WO (1) | WO2015029235A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020123918A (ja) * | 2019-01-31 | 2020-08-13 | 富士通株式会社 | アンテナ装置、及び、無線通信装置 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD803194S1 (en) * | 2015-05-24 | 2017-11-21 | Airgain Incorporated | Antenna |
USD797708S1 (en) * | 2015-05-24 | 2017-09-19 | Airgain Incorporated | Antenna |
DE102021203543B3 (de) * | 2021-04-09 | 2022-08-25 | Continental Automotive Technologies GmbH | Antennenvorrichtung für eine Mobilfunkeinrichtung |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6141205A (ja) * | 1984-08-01 | 1986-02-27 | Nippon Telegr & Teleph Corp <Ntt> | 広帯域伝送線路アンテナ |
JPH09162634A (ja) * | 1995-12-04 | 1997-06-20 | N T T Ido Tsushinmo Kk | マイクロストリップアンテナ装置 |
JP2000138515A (ja) * | 1998-08-25 | 2000-05-16 | Murata Mfg Co Ltd | アンテナ装置およびそれを用いた通信機 |
JP2002135028A (ja) * | 2000-10-20 | 2002-05-10 | Nec Corp | チップアンテナ |
JP2003234613A (ja) * | 2002-02-08 | 2003-08-22 | Mitsubishi Electric Corp | アンテナ素子 |
JP2004531153A (ja) * | 2001-06-18 | 2004-10-07 | サントル ナシオナル ドゥ ラ ルシェルシュ シアンティフィーク(セーエヌエールエス) | アンテナ |
US20120092226A1 (en) | 2005-03-15 | 2012-04-19 | Carles Puente Baliarda | Slotted ground-plane used as a slot antenna or used for a pifa antenna |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5568155A (en) * | 1992-12-07 | 1996-10-22 | Ntt Mobile Communications Network Incorporation | Antenna devices having double-resonance characteristics |
US6795021B2 (en) * | 2002-03-01 | 2004-09-21 | Massachusetts Institute Of Technology | Tunable multi-band antenna array |
US6819287B2 (en) * | 2002-03-15 | 2004-11-16 | Centurion Wireless Technologies, Inc. | Planar inverted-F antenna including a matching network having transmission line stubs and capacitor/inductor tank circuits |
JP2005531177A (ja) | 2002-06-25 | 2005-10-13 | フラクトゥス・ソシエダッド・アノニマ | ハンドヘルド端末装置用マルチバンドアンテナ |
FR2842951A1 (fr) | 2002-07-26 | 2004-01-30 | Socapex Amphenol | Antenne a plaque de faible epaisseur |
US20040017318A1 (en) | 2002-07-26 | 2004-01-29 | Amphenol Socapex | Antenna of small dimensions |
FI114836B (fi) | 2002-09-19 | 2004-12-31 | Filtronic Lk Oy | Sisäinen antenni |
US6812891B2 (en) * | 2002-11-07 | 2004-11-02 | Skycross, Inc. | Tri-band multi-mode antenna |
US6982672B2 (en) * | 2004-03-08 | 2006-01-03 | Intel Corporation | Multi-band antenna and system for wireless local area network communications |
EP1792363A1 (en) * | 2004-09-21 | 2007-06-06 | Fractus, S.A. | Multilevel ground-plane for a mobile device |
WO2006070017A1 (en) | 2004-12-30 | 2006-07-06 | Fractus, S.A. | Shaped ground plane for radio apparatus |
JP2007142934A (ja) | 2005-11-21 | 2007-06-07 | Alps Electric Co Ltd | アンテナ装置 |
WO2007100001A1 (ja) * | 2006-02-28 | 2007-09-07 | Fujitsu Limited | アンテナ装置、電子装置、およびアンテナカバー |
US7427956B2 (en) * | 2006-11-27 | 2008-09-23 | Speed Tech Corp. | Antenna structure |
US7876274B2 (en) * | 2007-06-21 | 2011-01-25 | Apple Inc. | Wireless handheld electronic device |
US8106836B2 (en) | 2008-04-11 | 2012-01-31 | Apple Inc. | Hybrid antennas for electronic devices |
TWI390796B (zh) * | 2008-09-09 | 2013-03-21 | Arcadyan Technology Corp | 立體雙頻天線裝置 |
WO2010109648A1 (ja) * | 2009-03-27 | 2010-09-30 | 富士通株式会社 | アンテナユニットおよび電子装置 |
-
2013
- 2013-08-30 JP JP2015533905A patent/JP6079886B2/ja active Active
- 2013-08-30 EP EP13892395.8A patent/EP3041088B1/en active Active
- 2013-08-30 WO PCT/JP2013/073404 patent/WO2015029235A1/ja active Application Filing
-
2016
- 2016-02-26 US US15/054,406 patent/US9905917B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6141205A (ja) * | 1984-08-01 | 1986-02-27 | Nippon Telegr & Teleph Corp <Ntt> | 広帯域伝送線路アンテナ |
JPH09162634A (ja) * | 1995-12-04 | 1997-06-20 | N T T Ido Tsushinmo Kk | マイクロストリップアンテナ装置 |
JP2000138515A (ja) * | 1998-08-25 | 2000-05-16 | Murata Mfg Co Ltd | アンテナ装置およびそれを用いた通信機 |
JP2002135028A (ja) * | 2000-10-20 | 2002-05-10 | Nec Corp | チップアンテナ |
JP2004531153A (ja) * | 2001-06-18 | 2004-10-07 | サントル ナシオナル ドゥ ラ ルシェルシュ シアンティフィーク(セーエヌエールエス) | アンテナ |
JP2003234613A (ja) * | 2002-02-08 | 2003-08-22 | Mitsubishi Electric Corp | アンテナ素子 |
US20120092226A1 (en) | 2005-03-15 | 2012-04-19 | Carles Puente Baliarda | Slotted ground-plane used as a slot antenna or used for a pifa antenna |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020123918A (ja) * | 2019-01-31 | 2020-08-13 | 富士通株式会社 | アンテナ装置、及び、無線通信装置 |
JP7247614B2 (ja) | 2019-01-31 | 2023-03-29 | 富士通株式会社 | アンテナ装置、及び、無線通信装置 |
Also Published As
Publication number | Publication date |
---|---|
EP3041088A1 (en) | 2016-07-06 |
EP3041088A4 (en) | 2016-08-24 |
EP3041088B1 (en) | 2020-01-22 |
US9905917B2 (en) | 2018-02-27 |
JPWO2015029235A1 (ja) | 2017-03-02 |
JP6079886B2 (ja) | 2017-02-15 |
US20160181691A1 (en) | 2016-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6298103B2 (ja) | アンテナモジュール、および当該アンテナモジュールを用いたモバイル端末 | |
US9627769B2 (en) | Slot antenna and information terminal apparatus using the same | |
US10283847B2 (en) | Antenna device and mobile device | |
US20150061952A1 (en) | Broadband Antenna | |
JP6051879B2 (ja) | パッチアンテナ | |
US20130135156A1 (en) | Multi-Band Antenna For Portable Communication Device | |
TW201644095A (zh) | 天線結構及應用該天線結構的無線通訊裝置 | |
EP3823096B1 (en) | Antenna structure and electronic device | |
JP6079886B2 (ja) | アンテナ装置 | |
US8319691B2 (en) | Multi-band antenna | |
TWI619313B (zh) | 電子裝置及其雙頻印刷式天線 | |
TWI281764B (en) | Hidden multi-band antenna used for portable devices | |
US7598912B2 (en) | Planar antenna structure | |
JP2019106690A (ja) | 無線通信機器 | |
US20130335292A1 (en) | Circuit board having antenna structure | |
TWI545837B (zh) | 無線通訊裝置及其天線模組 | |
JP2004032242A (ja) | 携帯無線機用アンテナ | |
JP2012095121A (ja) | アンテナおよび携帯無線機 | |
JP2004120519A (ja) | 携帯無線機用アンテナ | |
JP5985725B1 (ja) | 多周波アンテナ | |
JP2020005198A (ja) | 無線通信装置 | |
US20130099978A1 (en) | Internal printed antenna | |
TWI797896B (zh) | 天線裝置 | |
TWI523313B (zh) | 電子裝置 | |
US8063831B2 (en) | Broadband antenna |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13892395 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2015533905 Country of ref document: JP Kind code of ref document: A |
|
REEP | Request for entry into the european phase |
Ref document number: 2013892395 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013892395 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |