WO2013102967A1 - Antenna device - Google Patents

Antenna device Download PDF

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Publication number
WO2013102967A1
WO2013102967A1 PCT/JP2012/007683 JP2012007683W WO2013102967A1 WO 2013102967 A1 WO2013102967 A1 WO 2013102967A1 JP 2012007683 W JP2012007683 W JP 2012007683W WO 2013102967 A1 WO2013102967 A1 WO 2013102967A1
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WO
WIPO (PCT)
Prior art keywords
antenna
frequency
antenna device
modification
elements
Prior art date
Application number
PCT/JP2012/007683
Other languages
French (fr)
Japanese (ja)
Inventor
佐藤　浩
小柳　芳雄
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2013552339A priority Critical patent/JP5703450B2/en
Publication of WO2013102967A1 publication Critical patent/WO2013102967A1/en

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    • 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
    • H01Q1/243—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 built-in antennas
    • 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
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point

Definitions

  • the present invention relates to an antenna device suitable for use in a portable wireless terminal.
  • MIMO Multiple Input Multiple Multiple Output
  • Patent Document 1 discloses a technique for reducing the coupling by inserting a junction element between two antenna elements.
  • Patent Document 2 discloses a technique in which stub elements are arranged between antennas so that the antennas can be arranged close to each other.
  • the above-described MIMO communication is an effective means for improving the communication capacity
  • communication is performed at the same frequency using a plurality of antenna elements. Therefore, if the coupling between the antenna elements is not reduced, the antenna efficiency is degraded.
  • a desired communication capacity cannot be obtained due to an increase in the correlation coefficient. For example, as shown in FIG. 30, when two antenna elements 100 and 101 are arranged close to each other, for example, 40% of the energy emitted from the antenna element 100 is coupled to the adjacent antenna element 101 due to the coupling between the antenna elements. Will be absorbed. By reducing the coupling between the antenna elements, it becomes possible to release 80% of energy from the antenna element 100. Thus, antenna efficiency can be improved by reducing coupling between antenna elements. The communication capacity can be improved by improving the antenna efficiency.
  • the correlation coefficient between the antenna elements in the two antenna elements can be derived from the equation shown in FIG.
  • S parameters S12 and S21 each represent a connection. If this coupling (S12 and S21) is small, the correlation is low and the communication capacity is improved.
  • the coupling between the antenna elements there are (1) a method of increasing the distance between the antenna elements, and (2) a method of connecting the antenna elements using lumped constant components.
  • the method (1) it is difficult to fit in the casing of a small portable wireless terminal.
  • the coupling can be reduced, but a loss is generated due to the resistance of the lumped component, and the antenna efficiency is degraded accordingly.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide an antenna device that can reduce the coupling between antenna elements in a plurality of antenna elements, improve the efficiency of the antenna, and reduce the correlation coefficient.
  • the antenna device of the present invention includes a first radio circuit that operates at a first frequency, a first power feeding unit connected to the first radio circuit, a first antenna element fed from the first power feeding unit, A second radio circuit operating at the first frequency; a second power feeding unit connected to the second radio circuit; and a second antenna element fed from the second power feeding unit.
  • the antenna element includes a first element having an electrical length of ⁇ / 4 at the second frequency and a second element having an electrical length of ⁇ / 4 or 3 ⁇ / 4 at the third frequency, and the first element
  • the second element is electrically connected in the vicinity of the first power feeding unit, and the first power feeding unit is connected to the first antenna element via a first matching circuit unit for matching at the second frequency.
  • the second frequency is the first frequency.
  • the first frequency is higher than the third frequency
  • the second antenna element includes a third element having an electrical length of ⁇ / 4 at a fourth frequency
  • the third element and the fourth element are electrically connected in the vicinity of the second power feeding unit, and the second power feeding. Is connected to the second antenna element via a second matching circuit for matching at the fourth frequency, the fourth frequency being higher than the first frequency, and the first frequency
  • the frequency is higher than the fifth frequency.
  • the first and second antennas are separated by using a lumped constant component (component for reducing the coupling between the first and second antenna elements) or by separating the distance between the first and second antenna elements.
  • the coupling between the first and second antenna elements can be reduced without connecting the elements.
  • the first and second antenna elements can be arranged close to each other without arranging the stub between the first and second antenna elements, and the cost for the stub can be reduced. That is, the coupling can be reduced at a lower cost and with a lower loss than in the past. As a result, the antenna efficiency can be improved and the correlation coefficient can be reduced.
  • the second frequency and the fourth frequency are equal, and the third frequency and the fifth frequency are equal.
  • the coupling between antenna elements in a plurality of antenna elements can be reduced, the efficiency of the antenna can be improved, and the correlation coefficient can be reduced.
  • FIG. 1 Schematic diagram showing the basic configuration of the antenna device according to the first embodiment of the present invention.
  • the perspective view which shows the specific structure of the antenna apparatus of FIG. (A), (b) The figure which shows the frequency characteristic of the antenna apparatus of FIG. The figure which shows the formula of Y12 component of an admittance matrix
  • the schematic diagram which shows the basic composition of the example which enlarged the difference of the branch element length in each of the 1st antenna element and the 2nd antenna element of the antenna apparatus of FIG. (A), (b) The figure which shows the frequency characteristic at the time of enlarging the difference of branch element length in each of the 1st antenna element of the antenna apparatus of FIG. 1, and a 2nd antenna element.
  • the perspective view which shows the specific structure of the modification 1-1 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-2 of the antenna apparatus of FIG. The perspective view which shows the specific structure of the modification 1-3 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-4 of the antenna apparatus of FIG. The perspective view which shows the specific structure of the modification 1-5 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-6 of the antenna apparatus of FIG. The perspective view which shows the specific structure of the modification 1-7 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-8 of the antenna apparatus of FIG. The perspective view which shows the specific structure of the modification 1-9 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-11 of the antenna apparatus of FIG. The perspective view which shows the specific structure of the modification 1-12 of the antenna apparatus of FIG.
  • the perspective view which shows the specific structure of the modification 1-13 of the antenna apparatus of FIG. Schematic diagram showing the basic configuration of the antenna device according to the second embodiment of the present invention.
  • the figure which shows the frequency characteristic of the antenna apparatus of FIG. FIG. 22A is a diagram in which the frequency characteristics of (a) and the frequency characteristics of (b) are superimposed.
  • FIG. 7 is a perspective view showing an overview of a portable wireless terminal using an application example of the antenna device of FIG. The figure for demonstrating the problem in the conventional antenna device The figure which shows the formula of the correlation coefficient between the antenna elements in two antenna elements
  • FIG. 1 is a schematic diagram showing a basic configuration of an antenna apparatus according to Embodiment 1 of the present invention.
  • an antenna device 1 according to the present embodiment includes a first radio circuit 2 that operates at a first frequency f1, a first feeding unit 3 connected to the first radio circuit 2, and a first feeding unit.
  • a first matching circuit unit 4 connected to 3 and a first antenna element 5 having a branching element fed from the first feeding unit 3 via the first matching circuit unit 4 and having different long and short sides.
  • a second radio circuit 6 that operates at the first frequency f1, a second power feeding unit 7 connected to the second radio circuit 6, a second matching circuit unit 8 connected to the second power feeding unit 7, A second antenna element 9 that is fed from the second feeding section 7 via the second matching circuit section 8 and has branching elements having different long sides and short sides.
  • the first antenna element 5 includes a first element (short-side branching element) 51 having an electrical length of ⁇ / 4 at the second frequency f2, and a second element having an electrical length of 3 ⁇ / 4 at the third frequency f3. (Long side branch element) 52.
  • the first element 51 and the second element 52 are electrically connected in the vicinity of the first power feeding unit 3.
  • the 1st electric power feeding part 3 is connected to the 1st antenna element 5 via the 1st matching circuit part 4 matched with the 2nd frequency f2.
  • the second frequency f2 is higher than the first frequency f1, and the first frequency f1 is higher than the third frequency f3.
  • the second antenna element 9 includes a third element (short-side branching element) 91 having an electrical length of ⁇ / 4 at a fourth frequency f4 and a fourth element having an electrical length of 3 ⁇ / 4 at a fifth frequency f5. (Long side branch element) 92.
  • the third element 91 and the fourth element 92 are electrically connected in the vicinity of the second power feeding unit 7.
  • the 2nd electric power feeding part 7 is connected to the 2nd antenna element 9 via the 2nd matching circuit part 8 matched with the 4th frequency f4.
  • the fourth frequency f4 is higher than the first frequency f1, and the first frequency f1 is higher than the fifth frequency f5.
  • the first element 51 and the third element 91 have the same electrical length
  • the second element 52 and the fourth element 92 have the same electrical length.
  • the frequency f2 and the fourth frequency f4 are equal
  • the third frequency f3 and the fifth frequency f5 are equal.
  • the first element 51 and the second element 52, and the third element 91 and the fourth element 92 can have the same electrical length.
  • the electrical length of the first element 51 and the second element 52 may be ⁇ / 4
  • the electrical length of the third element 91 and the fourth element 92 may be ⁇ / 4.
  • FIG. 2 is a perspective view showing a specific configuration of the antenna device 1 according to the present embodiment.
  • first, second radio circuits 2, 6 and first, second are formed on the surface side of a substrate 14 comprising a rectangular plate-like dielectric 12 and a metal plate 13 laminated on the upper and lower surfaces of the right end portion thereof.
  • Feeders 3 and 7 are mounted, and first and second antenna elements 5 and 9 are patterned on the exposed portion of the dielectric 12 on the surface side of the substrate 14.
  • the first and second power feeding portions 3 and 7 and the base end portions of the first and second antenna elements 5 and 9 (the connecting portion of the two elements is referred to as the base end portion).
  • the first and second matching circuit sections 4 and 8 are mounted therebetween.
  • a desired frequency that is, the first frequency f1
  • Resonance is generated on the low frequency side and the high frequency side.
  • FIG. 3A shows the frequency characteristic (two-dot chain line) of the real part (Re) of the Y12 component (mS) of the admittance matrix and the frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix ( (Solid line).
  • the second frequency f2 of the first element 51 and the fourth frequency f4 of the third element 91 both have the same resonance frequency.
  • the third frequency f3 of the second element 52 and the fifth frequency f5 of the fourth element 92 both have the same resonance frequency.
  • the lengths of the elements 51, 52, 91, 92 of the first antenna element 5 and the second antenna element 9 are finely adjusted, and at a desired frequency, ⁇ 10 mS ⁇ Re (Y12) ⁇ + 10 mS and ⁇ 5 mS ⁇ Im ( Y12) ⁇ + 5 mS.
  • (B) of FIG. 3 is a frequency characteristic of the S parameter (S12) representing the coupling.
  • the real part (Re) of the Y12 component (mS) of the admittance matrix is substantially 0 (zero) at the first frequency f1
  • the imaginary of the Y12 component (mS) of the admittance matrix is substantially 0 (zero) at the first frequency f1.
  • the real part of the Y12 component (mS) of the admittance matrix becomes substantially 0 (zero) at the first frequency f1, and the admittance
  • the imaginary part of the Y12 component (mS) of the matrix is substantially 0 (zero).
  • FIG. 4 is a diagram showing an expression of the Y12 component of the admittance matrix.
  • ⁇ is amplitude
  • ⁇ is phase
  • e is the base of natural logarithm.
  • FIG. 5 is a schematic diagram showing a basic configuration of an example in which the difference in branch element length is increased in each of the first antenna element 5 and the second antenna element 9.
  • the second element 52 of the first antenna element 5 is lengthened, the first element 51 is shortened to increase the difference, the third element 91 of the second antenna element 9 is shortened, and the fourth element The element 92 is lengthened to increase the difference.
  • the fourth element The element 92 is lengthened to increase the difference.
  • the tip portions of the second element 52 and the fourth element 92 are bent inward at right angles.
  • the first and second radio circuits 2 and 6 and the first and second matching circuit units 4 and 8 are omitted.
  • FIGS. 6A and 6B are diagrams showing frequency characteristics when the difference in branch element length is increased in each of the first antenna element 5 and the second antenna element 9.
  • FIG. 6A shows the frequency characteristic (two-dot chain line) of the real part (Re) of the Y12 component (mS) of the admittance matrix and the frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix ( (B) in FIG. 6 is a frequency characteristic of the S parameter (S12) representing the coupling.
  • FIG. 6B it can be seen that the S parameter (S12) representing the coupling at the first frequency f1 has a wider bandwidth than the case of FIG. You can see)
  • the first antenna element 5 is electrically connected to the first element 51 having the electrical length of ⁇ / 4 at the second frequency f2 and the third frequency f3.
  • the second element 52 having a length of 3 ⁇ / 4 has a two-branch shape, the first element 51 and the second element 52 are electrically connected in the vicinity of the first power feeding unit 3, and the first power feeding unit 3 is connected to the second frequency. It is connected to the first antenna element 5 via the first matching circuit section 4 to be matched at f2, the second frequency f2 is set to be higher than the first frequency f1, and the first frequency f1 is set to the third frequency f3.
  • the second antenna element 9 has a higher frequency
  • the second element 9 has a third element 91 having an electrical length of ⁇ / 4 at the fourth frequency f4 and a second element 92 having an electrical length of 3 ⁇ / 4 at the fifth frequency f5.
  • the third shape Element 91 and fourth element 92 are electrically connected in the vicinity of second power feeding portion 7, and second antenna element 9 is passed through second matching circuit portion 8 for matching second power feeding portion 7 at fourth frequency f4.
  • the fourth frequency f4 is higher than the first frequency f1, and the first frequency f1 is higher than the fifth frequency f5, so that the first and second antenna elements 5 and 9 are connected to each other.
  • the first and first antennas can be connected without separating the antenna elements 5 and 9 using lumped constant components (components for reducing the coupling between the first and second antenna elements 5 and 9).
  • the low coupling between the two antenna elements 5 and 9 can be achieved.
  • the 1st, 2nd antenna elements 5 and 9 can be arrange
  • the first and second antenna elements 5 and 9 are arranged in parallel to the longitudinal direction of the substrate 14, and the first element 51 and the third element 91 have the same electrical length.
  • the second element 52 and the fourth element 92 have the same electrical length, the invention is not limited to such a branched structure, and various patterns are conceivable. Hereinafter, various modified examples having different patterns will be described.
  • FIG. 7 is a perspective view showing a specific configuration of an antenna device 20 which is a modified example 1-1 of the antenna device 1 of FIG.
  • the antenna device 20 of Modification 1-1 has first and second antenna elements 5B and 9B arranged in the short direction of the substrate 14.
  • the branch structures of the first and second antenna elements 5B and 9B are the same as those of the antenna device 1 of FIG. That is, the first antenna element 5B includes a first element 51B and a second element 52B, and the second antenna element 9B includes a first element 91B and a second element 92B. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 8 is a perspective view showing a specific configuration of an antenna device 21 which is a modified example 1-2 of the antenna device 1 of FIG.
  • the antenna device 21 of Modification 1-2 employs a structure in which the longer element is branched from the middle of the shorter element. That is, in the first antenna element 5C, the second element 52C is branched from the middle of the first element 51C, and in the second antenna element 9C, the fourth element 92C is branched from the middle of the third element 91C. Yes. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 9 is a perspective view showing a specific configuration of an antenna device 22 which is a modified example 1-3 of the antenna device 1 of FIG.
  • an antenna device 22 of Modification 1-3 has first and second antenna elements 5D and 9D arranged in the short direction of the substrate 14, and further, the antenna device of Modification 1-2 described above.
  • a structure in which the longer element is branched from the middle of the shorter element is employed. That is, in the first antenna element 5D, the second element 52D is branched from the middle of the first element 51D, and in the second antenna element 9D, the fourth element 92D is branched from the middle of the third element 91D. Yes. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 10 is a perspective view showing a specific configuration of an antenna device 23 which is a modified example 1-4 of the antenna device 1 of FIG.
  • an antenna device 23 of Modification 1-4 is obtained by replacing the first antenna element 5 of the antenna device 1 according to Embodiment 1 (see FIG. 2) with a commercially available chip antenna 16. Even if the first antenna element 5 is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 11 is a perspective view showing a specific configuration of an antenna device 24 which is a modified example 1-5 of the antenna device 1 of FIG.
  • an antenna device 24 of Modification 1-5 is obtained by replacing the first antenna element 5B of the antenna device 20 of Modification 1-1 (see FIG. 7) with a commercially available chip antenna 16.
  • the arrangement direction of the chip antenna 16 is the short direction of the substrate 14 as in the arrangement direction of the first antenna element 5B. Even if the first antenna element 5B is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 12 is a perspective view showing a specific configuration of an antenna device 25 which is a modified example 1-6 of the antenna device 1 of FIG.
  • an antenna device 25 of Modification 1-6 is obtained by replacing the first antenna element 5C of the antenna device 21 of Modification 1-2 (see FIG. 8) with a commercially available chip antenna 16.
  • the arrangement direction of the chip antenna 16 is the longitudinal direction of the substrate 14 similarly to the arrangement direction of the first antenna element 5C. Even if the first antenna element 5C is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 13 is a perspective view showing a specific configuration of an antenna device 26 which is a modified example 1-7 of the antenna device 1 of FIG.
  • an antenna device 26 of Modification 1-7 is obtained by replacing the first antenna element 5D of the antenna device 22 of Modification 1-3 described above (see FIG. 9) with a commercially available chip antenna 16.
  • the arrangement direction of the chip antenna 16 is the short direction of the substrate 14 in the same manner as the arrangement direction of the first antenna element 5D. Even if the first antenna element 5D is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 14 is a perspective view showing a specific configuration of an antenna device 27 which is a modified example 1-8 of the antenna device 1 of FIG.
  • an antenna device 27 of Modification 1-8 is configured such that each of the second element 52 and the fourth element 92 of the antenna device 1 (see FIG. 2) according to Embodiment 1 described above has a meander shape. is there.
  • “5E” for the first antenna element “51E” for the first element, “52E” for the second element, and “9E” for the second antenna element.
  • “91E” is attached to the third element
  • “92E” is attached to the fourth element.
  • the electrical lengths of the second element 52E and the fourth element 92E are longer than the electrical lengths of the second element 52 and the fourth element 92 of the antenna device 1, respectively. Even if each of the second element 52E and the fourth element 92E has a meander shape, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 15 is a perspective view showing a specific configuration of an antenna device 28 which is a modified example 1-9 of the antenna device 1 of FIG.
  • the antenna device 28 of Modification 1-9 has a meander shape in each of the second element 52C and the fourth element 92C of the antenna device 21 (see FIG. 8) of Modification 1-2. is there.
  • “5F” for the first antenna element “51F” for the first element, “52F” for the second element, and “9F” for the second antenna element.
  • “91F” is attached to the third element
  • “92F” is attached to the fourth element.
  • the electrical lengths of the second element 52F and the fourth element 92F are longer than the electrical lengths of the second element 52C and the fourth element 92C of the antenna device 21, respectively. Even if each of the second element 52F and the fourth element 92F has a meander shape, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 16 is a perspective view showing a specific configuration of an antenna device 29 which is a modified example 1-10 of the antenna device 1 of FIG.
  • an antenna device 29 of Modification 1-10 is configured so that the length of the first antenna element 5 of the antenna device 1 according to Embodiment 1 (see FIG. 2) is shorter than that of the second antenna element 9. It is asymmetrical. That is, the length of the first element 51 of the first antenna element 5 is shorter than the length of the third element 91 of the second antenna element 9, and the length of the second element 52 of the first antenna element 5 is set to the second antenna element. 9 is made shorter than the length of the fourth element 92.
  • “5G” is attached to the first antenna element
  • 51G is attached to the first element
  • 52G is attached to the second element.
  • the second frequency f2 and the fourth frequency f4 become different values (f2 ⁇ f4), Further, since the third frequency f3 and the fifth frequency f5 have different values (f3 ⁇ f5), there are four resonance points. However, there is no change in the first frequency f1.
  • four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
  • FIG. 17 is a perspective view showing a specific configuration of an antenna device 30 which is a modified example 1-11 of the antenna device 1 of FIG.
  • the antenna device 30 of Modification 1-11 includes the second antenna element 9 of the antenna device 1 (see FIG. 2) according to Embodiment 1 described above and the antenna device of Modification 1-1 described above.
  • first antenna elements 5B are combined to be asymmetric in different directions. That is, the second antenna element 9 is arranged in the longitudinal direction of the substrate 14 and the first antenna element 5B is arranged in the short direction of the substrate 14.
  • the lengths of the first element 51B, the second element 52B, the third element 91, and the fourth element 92 are the same as those of the antenna device 30 of Modification 1-11. Since they are different, there are four resonance points. However, the first frequency f1 does not change. By changing the length of each of the first element 51B, the second element 52B, the third element 91, and the fourth element 92, four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
  • FIG. 18 is a perspective view showing a specific configuration of an antenna device 31 which is a modified example 1-12 of the antenna device 1 of FIG.
  • an antenna device 31 of Modification 1-12 has a length of the first antenna element 5C of the antenna device 21 of Modification 1-2 described above (see FIG. 8) shorter than that of the second antenna element 9C. It is asymmetrical. That is, the length of the first element 51C of the first antenna element 5C is shorter than the length of the third element 91C of the second antenna element 9C, and the length of the second element 52C of the first antenna element 5C is set to the second antenna element. This is shorter than the length of the 9C fourth element 92C.
  • “5H” is attached to the first antenna element
  • 51H is attached to the first element
  • 52H is attached to the second element.
  • the third frequency f3 and the fifth frequency f5 become different values (f3 ⁇ f5), Further, since the second frequency f2 and the fourth frequency f4 have different values (f2 ⁇ f4), there are four resonance points. However, there is no change in the first frequency f1.
  • four resonance points are obtained, but the obtained effect is the same as that of the antenna device 1 of FIG. .
  • FIG. 19 is a perspective view showing a specific configuration of an antenna device 32 which is a modified example 1-13 of the antenna device 1 of FIG.
  • an antenna device 32 includes a second antenna element 9C of the antenna device 21 (see FIG. 8) which is the above-described modification example 1-2, and an antenna device 22 (see FIG. 9) which is the above-described modification example 1-3. )
  • the first antenna element 5D Of the first antenna element 5D to make the directions different asymmetrical. That is, the second antenna element 9C is arranged in the longitudinal direction of the substrate 14, and the first antenna element 5D is arranged in the short direction of the substrate 14.
  • the antenna device 29 see FIG.
  • the antenna device 32 of Modification 1-13 also includes the first element 51D, the second element 52D, the third element 91C, and the fourth element 92C. Since each length is different, there are four resonance points. However, there is no change in the first frequency f1. By changing the length of each of the first element 51D, the second element 52D, the third element 91C, and the fourth element 92C, four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
  • FIG. 20 is a schematic diagram showing a basic configuration of an antenna apparatus according to Embodiment 2 of the present invention.
  • the radio circuit and the matching circuit unit are omitted, but these are the same as those of the antenna device 1 according to the first embodiment described above.
  • the antenna device 40 includes first and second antenna elements 41 and 42 having a three-branch structure.
  • the first antenna element 41 includes a first element 410, a second element 411, and a third element 412
  • the second antenna element 42 includes a fourth element 420, a fifth element 421, and a sixth element 422. Yes.
  • the length relationship of each element is such that the first element 410 ⁇ the second element 411 ⁇ the third element 412, and the second antenna element 42 has the fourth element 420 ⁇ The fifth element 421 ⁇ the sixth element 422. In this case, when the difference in element length is increased, the band is widened, and when it is decreased, the band is narrowed.
  • the difference in length between the first element 410 and the second element 411 and the fourth element 420 and the fifth element 421 is large, and the second element 411 and the third element 412 and The difference in length between the fifth element 421 and the sixth element 422 is reduced.
  • FIG. 21 is a perspective view showing a specific configuration of the antenna device 40 according to the present embodiment.
  • first and second radio circuits 2 and 6 and first and second power feeding units 3 and 7 are mounted on the surface of the substrate 14 on the metal plate 13 side.
  • the first and second antenna elements 41 and 42 are patterned on the surface of the dielectric 12 constituting the substrate 14 in the longitudinal direction of the substrate 14.
  • the first and second matching circuit portions 4 and 8 are provided between the first and second feeding portions 3 and 7 and the base end portions of the first and second antenna elements 41 and 42. Has been implemented.
  • FIG. 22 (a) and 22 (b) are diagrams illustrating frequency characteristics of the antenna device 40 according to the present embodiment.
  • (A) of the same figure is a frequency characteristic of the real part (Re) of Y12 component (mS) of an admittance matrix.
  • (b) of the figure is a frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix.
  • FIG. 23 is a diagram in which the frequency characteristics of (a) and (b) of FIG. 22 are superimposed.
  • the second frequency f2 of the first element 410 and the fifth frequency f5 of the fourth element 420 are both the same resonance frequency
  • the third frequency f3 of the second element 411 and the sixth frequency f5 of the fifth element 421 are the same.
  • Both the frequencies f6 have the same resonance frequency
  • the fourth frequency f4 of the third element 412 and the seventh frequency f7 of the sixth element 422 both have the same resonance frequency.
  • FIG. 24 is a diagram showing the frequency characteristics of the S parameter (S12) representing coupling.
  • the real part (Re) of the Y12 component (mS) of the admittance matrix is substantially equal to the first frequency f1 (1.5 GHz) and two frequencies of 2.5 GHz. 0 (zero, mS). That is, the real part (Re) of the Y12 component (mS) of the admittance matrix becomes approximately 0 (zero) at two frequencies of 1.5 GHz and 2.5 GHz of the first frequency f1.
  • Im (Y12) 0 is obtained only by the antenna shape.
  • the three-branch structure can cope with a reduction in coupling between two frequencies (1.5 GHz and 2.5 GHz).
  • FIGS. 25A and 25B are diagrams showing conditions of the real part (Re) and imaginary part (Im) of the Y12 component (mS) of the admittance matrix, and FIG. 25A shows the condition of the real part (Re).
  • (B) are conditions for the imaginary part (Im).
  • the real part (Re) needs to satisfy ⁇ 10 mS ⁇ Re (Y12) ⁇ + 10 mS
  • the imaginary part (Im) needs to satisfy the condition ⁇ 5 mS ⁇ Im (Y12) ⁇ + 5 mS. There is. By satisfying these conditions, the coupling between the first antenna element 41 and the second antenna element 42 can be reduced.
  • FIG. 26 is a perspective view showing a specific configuration of an antenna device 43 which is a modified example 2 of the antenna device 40 of FIG.
  • the antenna device 43 of Modification 2 in the first antenna element 41B, the second element 411B branches from the middle of the first element 410B, and further the third element 412B branches from the middle of the second element 411B.
  • the second antenna element 42B employs a three-branch structure in which the fifth element 421B branches from the middle of the fourth element 420B, and the sixth element 422B branches from the middle of the fifth element 421B. . Even with such a three-branch structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
  • FIG. 27 is a perspective view showing an overview of a portable wireless terminal using the antenna device 1 according to the first embodiment.
  • the first antenna element 5 and the second antenna element 9 are arranged close to each other in the lateral direction of the casing at the right corner of the upper portion of the casing.
  • FIG. 28 is a perspective view showing an overview of a portable wireless terminal using the antenna device 20 (see FIG. 7) of Modification 1-1.
  • the first antenna element 5B and the second antenna element 9B are arranged close to each other at the center of the upper part of the housing.
  • the 1st antenna element 5B and the 2nd antenna element 9B are arrange
  • FIG. 29 is a perspective view showing an overview of a portable wireless terminal using an application example of the antenna device 20 (see FIG. 7) of Modification 1-1.
  • the portable wireless terminal 62 shown in the figure is obtained by reversing the arrangement directions of the first antenna element 5B and the second antenna element 9B of the antenna device 20 of Modification 1-1. That is, the first antenna element 5B and the second antenna element 9B are arranged in the facing direction.
  • the present invention can reduce the coupling between antenna elements in a plurality of antenna elements, and has the effect of improving the efficiency of the antenna and reducing the correlation coefficient. Applicable.
  • Second wireless circuit First matching circuit unit 5 , 5B, 5C, 5D, 5E, 5F, 5G, 5H, 41, 41B First antenna element 6 Second wireless circuit 7 Second feeding unit 8 Second matching circuit unit 9, 9B, 9C, 9D, 9E, 9F, 42, 42B Second antenna element 12 Dielectric 13 Metal plate 14 Substrate 16 Chip antenna 51, 51B, 51C, 51D, 51E, 51F, 51G, 51H, 410, 410B First element 52, 52B, 52C, 52D, 52E, 52F, 52G, 52H, 411, 411B Second element 60, 61, 62 Portable wireless terminal 91, 91B, 91C, 91D, 91E, 91F, 412, 412B 3 element 92,92B, 92C, 92D, 92E, 92F, 420,420B fourth element 421,421B

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Abstract

This antenna device comprises: a first wireless circuit (2) for operating at a first frequency (f1); a first power feed unit (3) connected to the first wireless circuit (2); a first matching circuit section (4) connected to the first power feed unit (3); a first antenna element (5) having power fed from the first power feed unit (3), and having a first element (51) with an electrical length of λ/4 at a second frequency (f2) and a second element (52) with an electrical length of 3λ/4 at a third frequency (f3); a second wireless circuit (6) for operating at the first frequency (f1); a second power feed unit (7) connected to the second wireless circuit (6); a second matching circuit section (8) connected to the second power feed unit (7); and a second antenna element (9) having power fed from the second power feed unit (7), and having a third element (91) with an electrical length of λ/4 at a fourth frequency (f4) and a fourth element (92) with an electrical length of 3λ/4 at a fifth frequency (f5), wherein f3 < f1 < f2, and f5 < f1 < f4.

Description

アンテナ装置Antenna device
　本発明は、携帯無線端末に用いて好適なアンテナ装置に関する。 The present invention relates to an antenna device suitable for use in a portable wireless terminal.
　近年の携帯無線端末では、大容量のデータ伝送方式に対応するため、複数のアンテナ素子の使用が検討されている。複数のアンテナ素子を用いたＭＩＭＯ（Multiple Input Multiple Output）通信は通信容量を向上させる有効な手段である。 In recent portable wireless terminals, use of a plurality of antenna elements is being studied in order to support a large capacity data transmission system. MIMO (Multiple Input Multiple Multiple Output) communication using a plurality of antenna elements is an effective means for improving communication capacity.
　現行のセルラ方式のみでも、８００ＭＨｚ、１．５ＧＨｚ、１．７ＧＨｚ、２．０ＧＨｚの４つの周波数帯が使用されていることもあって、マルチバンドに対応できるアンテナ装置の開発が望まれている。 Even in the current cellular system alone, four frequency bands of 800 MHz, 1.5 GHz, 1.7 GHz, and 2.0 GHz are used, and therefore, it is desired to develop an antenna device that can support multiband.
　小型の携帯無線端末に複数のアンテナ素子を搭載する場合、アンテナ効率劣化の原因となるアンテナ素子間の結合が大きくならないように、アンテナ素子間で高いアイソレーションを確保する必要がある。特許文献１には、２つのアンテナ素子の間に接合素子を介挿して低結合化する技術が開示されている。また、特許文献２には、アンテナ間にスタブ素子を配置して、アンテナ間を近接配置できるようにした技術が開示されている。 When a plurality of antenna elements are mounted on a small portable wireless terminal, it is necessary to ensure high isolation between the antenna elements so that the coupling between the antenna elements that causes deterioration of the antenna efficiency does not increase. Patent Document 1 discloses a technique for reducing the coupling by inserting a junction element between two antenna elements. Patent Document 2 discloses a technique in which stub elements are arranged between antennas so that the antennas can be arranged close to each other.
米国特許出願公開第２００８／０２５８９９１号明細書US Patent Application Publication No. 2008/0258991 国際公開第００／５１２０１号International Publication No. 00/52001
　しかしながら、上述したＭＩＭＯ通信は通信容量を向上させる有効な手段であるものの、複数のアンテナ素子を用いて同一周波数で通信を行うため、アンテナ素子間の結合を低減させなければ、アンテナ効率の劣化や相関係数の上昇により、所望の通信容量を得ることができない。例えば、図３０に示すように、２つのアンテナ素子１００，１０１を近接配置した場合、アンテナ素子間の結合により、アンテナ素子１００から放出されるエネルギーのうちの例えば４０％が隣接するアンテナ素子１０１に吸収されることになる。アンテナ素子間の結合を低減することで、アンテナ素子１００から８０％のエネルギーを放出させることが可能となる。このようにアンテナ素子間の結合を低減することで、アンテナ効率を向上させることができる。そして、アンテナ効率を向上させることで通信容量の向上が図れる。２つのアンテナ素子におけるアンテナ素子間の相関係数は図３１に示す式から導出できる。同図において、ＳパラメータのＳ１２及びＳ２１はそれぞれ結合を表す。この結合（Ｓ１２とＳ２１）が小さければ相関が低くなり、通信容量が向上する。 However, although the above-described MIMO communication is an effective means for improving the communication capacity, communication is performed at the same frequency using a plurality of antenna elements. Therefore, if the coupling between the antenna elements is not reduced, the antenna efficiency is degraded. A desired communication capacity cannot be obtained due to an increase in the correlation coefficient. For example, as shown in FIG. 30, when two antenna elements 100 and 101 are arranged close to each other, for example, 40% of the energy emitted from the antenna element 100 is coupled to the adjacent antenna element 101 due to the coupling between the antenna elements. Will be absorbed. By reducing the coupling between the antenna elements, it becomes possible to release 80% of energy from the antenna element 100. Thus, antenna efficiency can be improved by reducing coupling between antenna elements. The communication capacity can be improved by improving the antenna efficiency. The correlation coefficient between the antenna elements in the two antenna elements can be derived from the equation shown in FIG. In the figure, S parameters S12 and S21 each represent a connection. If this coupling (S12 and S21) is small, the correlation is low and the communication capacity is improved.
　アンテナ素子間の結合を小さくする方法としては、（１）アンテナ素子間の距離を離す方法、（２）集中定数部品を用いてアンテナ素子間を接続する方法がある。しかしながら、（１）の方法では、小型の携帯無線端末の筐体内に収めることが困難である。（２）の方法では、結合を低減できるが、集中定数部品の抵抗分で損失が発生し、その分、アンテナ効率が劣化する。 As a method for reducing the coupling between the antenna elements, there are (1) a method of increasing the distance between the antenna elements, and (2) a method of connecting the antenna elements using lumped constant components. However, with the method (1), it is difficult to fit in the casing of a small portable wireless terminal. In the method (2), the coupling can be reduced, but a loss is generated due to the resistance of the lumped component, and the antenna efficiency is degraded accordingly.
　上述した特許文献１に記載された技術では、アンテナ素子間に接合素子を介挿するので、その接合素子の持つ抵抗分でアンテナ効率が劣化する。また、上述した特許文献２に記載された技術では、複数のスタブ素子を用いていることもあって、コストが高くつき、さらにアンテナ素子間にスタブ素子を配置するスペースが必要となることから、装置の小型化が図れない。 In the technique described in Patent Document 1 described above, since the junction element is inserted between the antenna elements, the antenna efficiency is degraded by the resistance of the junction element. Moreover, in the technique described in Patent Document 2 described above, since a plurality of stub elements are used, the cost is high, and a space for arranging the stub elements between the antenna elements is required. The device cannot be downsized.
　本発明は、係る事情に鑑みてなされたものであり、複数のアンテナ素子におけるアンテナ素子間の結合を低減できるとともに、アンテナの効率向上、相関係数の低減が図れるアンテナ装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide an antenna device that can reduce the coupling between antenna elements in a plurality of antenna elements, improve the efficiency of the antenna, and reduce the correlation coefficient. And
　本発明のアンテナ装置は、第１の周波数で動作する第１無線回路と、前記第１無線回路に接続された第１給電部と、前記第１給電部から給電される第１アンテナ素子と、前記第１の周波数で動作する第２無線回路と、前記第２無線回路に接続された第２給電部と、前記第２給電部から給電される第２アンテナ素子と、を備え、前記第１アンテナ素子は、第２の周波数において電気長でλ／４となる第１エレメントと、第３の周波数において電気長でλ／４または３λ／４の第２エレメントとからなり、前記第１エレメントと前記第２エレメントとは、前記第１給電部付近で電気的に接続され、前記第１給電部は、前記第２の周波数で整合させる第１整合回路部を介して前記第１アンテナ素子に接続され、前記第２の周波数は前記第１の周波数より高周波であり、かつ、前記第１の周波数は前記第３の周波数より高周波であり、前記第２アンテナ素子は、第４の周波数において電気長でλ／４となる第３エレメントと、第５の周波数において電気長でλ／４または３λ／４の第４エレメントとからなり、前記第３エレメントと前記第４エレメントとは、前記第２給電部付近で電気的に接続され、前記第２給電部は、前記第４の周波数で整合させる第２整合回路部を介して前記第２アンテナ素子に接続され、前記第４の周波数は前記第１の周波数より高周波であり、かつ、前記第１の周波数は前記第５の周波数より高周波である。 The antenna device of the present invention includes a first radio circuit that operates at a first frequency, a first power feeding unit connected to the first radio circuit, a first antenna element fed from the first power feeding unit, A second radio circuit operating at the first frequency; a second power feeding unit connected to the second radio circuit; and a second antenna element fed from the second power feeding unit. The antenna element includes a first element having an electrical length of λ / 4 at the second frequency and a second element having an electrical length of λ / 4 or 3λ / 4 at the third frequency, and the first element The second element is electrically connected in the vicinity of the first power feeding unit, and the first power feeding unit is connected to the first antenna element via a first matching circuit unit for matching at the second frequency. And the second frequency is the first frequency. And the first frequency is higher than the third frequency, and the second antenna element includes a third element having an electrical length of λ / 4 at a fourth frequency, The third element and the fourth element are electrically connected in the vicinity of the second power feeding unit, and the second power feeding. Is connected to the second antenna element via a second matching circuit for matching at the fourth frequency, the fourth frequency being higher than the first frequency, and the first frequency The frequency is higher than the fifth frequency.
　上記構成によれば、第１，第２アンテナ素子間の距離を離したり、集中定数部品（第１，第２アンテナ素子間の結合を低減させるための部品）を用いて第１，第２アンテナ素子間を接続したりしなくても、第１，第２アンテナ素子間を低結合化できる。また、第１，第２アンテナ素子間にスタブを配置することなく第１，第２アンテナ素子を近接配置することができ、スタブにかかる費用を低減できる。即ち、従来よりも低コスト、低損失で低結合化ができる。この結果、アンテナ効率の向上、相関係数の低減が図れる。 According to the above configuration, the first and second antennas are separated by using a lumped constant component (component for reducing the coupling between the first and second antenna elements) or by separating the distance between the first and second antenna elements. The coupling between the first and second antenna elements can be reduced without connecting the elements. Further, the first and second antenna elements can be arranged close to each other without arranging the stub between the first and second antenna elements, and the cost for the stub can be reduced. That is, the coupling can be reduced at a lower cost and with a lower loss than in the past. As a result, the antenna efficiency can be improved and the correlation coefficient can be reduced.
　上記構成において、前記第２の周波数と前記第４の周波数とは等しく、かつ、前記第３の周波数と前記第５の周波数とは等しい。 In the above configuration, the second frequency and the fourth frequency are equal, and the third frequency and the fifth frequency are equal.
　本発明によれば、複数のアンテナ素子におけるアンテナ素子間の結合を低減できるとともに、アンテナの効率向上、相関係数の低減が図れる。 According to the present invention, the coupling between antenna elements in a plurality of antenna elements can be reduced, the efficiency of the antenna can be improved, and the correlation coefficient can be reduced.
本発明の実施の形態１に係るアンテナ装置の基本的な構成を示す模式図Schematic diagram showing the basic configuration of the antenna device according to the first embodiment of the present invention. 図１のアンテナ装置の具体的な構成を示す斜視図The perspective view which shows the specific structure of the antenna apparatus of FIG. （ａ），（ｂ）図１のアンテナ装置の周波数特性を示す図(A), (b) The figure which shows the frequency characteristic of the antenna apparatus of FIG. アドミタンス行列のＹ１２成分の式を示す図The figure which shows the formula of Y12 component of an admittance matrix 図１のアンテナ装置の第１アンテナ素子及び第２アンテナ素子のそれぞれにおいて、分岐エレメント長の差を大きくした例の基本構成を示す模式図The schematic diagram which shows the basic composition of the example which enlarged the difference of the branch element length in each of the 1st antenna element and the 2nd antenna element of the antenna apparatus of FIG. （ａ），（ｂ）図１のアンテナ装置の第１アンテナ素子及び第２アンテナ素子のそれぞれにおいて、分岐エレメント長の差を大きくした場合の周波数特性を示す図(A), (b) The figure which shows the frequency characteristic at the time of enlarging the difference of branch element length in each of the 1st antenna element of the antenna apparatus of FIG. 1, and a 2nd antenna element. 図１のアンテナ装置の変形例１－１の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-1 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－２の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-2 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－３の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-3 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－４の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-4 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－５の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-5 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－６の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-6 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－７の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-7 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－８の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-8 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－９の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-9 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－１０の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-10 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－１１の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-11 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－１２の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-12 of the antenna apparatus of FIG. 図１のアンテナ装置の変形例１－１３の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 1-13 of the antenna apparatus of FIG. 本発明の実施の形態２に係るアンテナ装置の基本的な構成を示す模式図Schematic diagram showing the basic configuration of the antenna device according to the second embodiment of the present invention. 図２０のアンテナ装置の具体的な構成を示す斜視図The perspective view which shows the specific structure of the antenna apparatus of FIG. （ａ），（ｂ）図２０のアンテナ装置の周波数特性を示す図(A), (b) The figure which shows the frequency characteristic of the antenna apparatus of FIG. 図２２の（ａ）の周波数特性と（ｂ）の周波数特性を重ね合わせた図FIG. 22A is a diagram in which the frequency characteristics of (a) and the frequency characteristics of (b) are superimposed. 結合を表すＳパラメータ（Ｓ１２）の周波数特性を示す図The figure which shows the frequency characteristic of S parameter (S12) showing coupling | bonding （ａ），（ｂ）アドミタンス行列のＹ１２成分の実部（Ｒｅ）と虚部（Ｉｍ）の条件を示す図(A), (b) The figure which shows the conditions of the real part (Re) and imaginary part (Im) of Y12 component of an admittance matrix 図２１のアンテナ装置の変形例２の具体的な構成を示す斜視図The perspective view which shows the specific structure of the modification 2 of the antenna apparatus of FIG. 図１のアンテナ装置を用いた携帯無線端末の概観を示す斜視図The perspective view which shows the external appearance of the portable radio | wireless terminal using the antenna apparatus of FIG. 図７のアンテナ装置を用いた携帯無線端末の概観を示す斜視図The perspective view which shows the external appearance of the portable radio | wireless terminal using the antenna apparatus of FIG. 図７のアンテナ装置の応用例を用いた携帯無線端末の概観を示す斜視図FIG. 7 is a perspective view showing an overview of a portable wireless terminal using an application example of the antenna device of FIG. 従来のアンテナ装置における問題点を説明するための図The figure for demonstrating the problem in the conventional antenna device ２つのアンテナ素子におけるアンテナ素子間の相関係数の式を示す図The figure which shows the formula of the correlation coefficient between the antenna elements in two antenna elements
　以下、本発明を実施するための好適な実施の形態について、図面を参照して詳細に説明する。 Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the drawings.
　（実施の形態１）
　図１は、本発明の実施の形態１に係るアンテナ装置の基本的な構成を示す模式図である。同図において、本実施の形態に係るアンテナ装置１は、第１の周波数ｆ１で動作する第１無線回路２と、第１無線回路２に接続された第１給電部３と、第１給電部３に接続された第１整合回路部４と、第１整合回路部４を介して第１給電部３から給電され、長辺と短辺の長さの異なる分岐素子を持つ第１アンテナ素子５と、第１の周波数ｆ１で動作する第２無線回路６と、第２無線回路６に接続された第２給電部７と、第２給電部７に接続された第２整合回路部８と、第２整合回路部８を介して第２給電部７から給電され、長辺と短辺の長さの異なる分岐素子を持つ第２アンテナ素子９と、を備える。 (Embodiment 1)
FIG. 1 is a schematic diagram showing a basic configuration of an antenna apparatus according to Embodiment 1 of the present invention. In the figure, an antenna device 1 according to the present embodiment includes a first radio circuit 2 that operates at a first frequency f1, a first feeding unit 3 connected to the first radio circuit 2, and a first feeding unit. A first matching circuit unit 4 connected to 3 and a first antenna element 5 having a branching element fed from the first feeding unit 3 via the first matching circuit unit 4 and having different long and short sides. A second radio circuit 6 that operates at the first frequency f1, a second power feeding unit 7 connected to the second radio circuit 6, a second matching circuit unit 8 connected to the second power feeding unit 7, A second antenna element 9 that is fed from the second feeding section 7 via the second matching circuit section 8 and has branching elements having different long sides and short sides.
　第１アンテナ素子５は、第２の周波数ｆ２において電気長でλ／４となる第１エレメント（短辺の分岐素子）５１と、第３の周波数ｆ３において電気長で３λ／４の第２エレメント（長辺の分岐素子）５２とからなる。第１エレメント５１と第２エレメント５２とは、第１給電部３付近で電気的に接続される。第１給電部３は、第２の周波数ｆ２で整合させる第１整合回路部４を介して第１アンテナ素子５に接続される。第２の周波数ｆ２は、第１の周波数ｆ１より高周波であり、かつ、第１の周波数ｆ１は第３の周波数ｆ３より高周波である。 The first antenna element 5 includes a first element (short-side branching element) 51 having an electrical length of λ / 4 at the second frequency f2, and a second element having an electrical length of 3λ / 4 at the third frequency f3. (Long side branch element) 52. The first element 51 and the second element 52 are electrically connected in the vicinity of the first power feeding unit 3. The 1st electric power feeding part 3 is connected to the 1st antenna element 5 via the 1st matching circuit part 4 matched with the 2nd frequency f2. The second frequency f2 is higher than the first frequency f1, and the first frequency f1 is higher than the third frequency f3.
　第２アンテナ素子９は、第４の周波数ｆ４において電気長でλ／４となる第３エレメント（短辺の分岐素子）９１と、第５の周波数ｆ５において電気長で３λ／４の第４エレメント（長辺の分岐素子）９２とからなる。第３エレメント９１と第４エレメント９２とは、第２給電部７付近で電気的に接続される。第２給電部７は、第４の周波数ｆ４で整合させる第２整合回路部８を介して第２アンテナ素子９に接続される。第４の周波数ｆ４は、第１の周波数ｆ１より高周波であり、かつ、第１の周波数ｆ１は第５の周波数ｆ５より高周波である。 The second antenna element 9 includes a third element (short-side branching element) 91 having an electrical length of λ / 4 at a fourth frequency f4 and a fourth element having an electrical length of 3λ / 4 at a fifth frequency f5. (Long side branch element) 92. The third element 91 and the fourth element 92 are electrically connected in the vicinity of the second power feeding unit 7. The 2nd electric power feeding part 7 is connected to the 2nd antenna element 9 via the 2nd matching circuit part 8 matched with the 4th frequency f4. The fourth frequency f4 is higher than the first frequency f1, and the first frequency f1 is higher than the fifth frequency f5.
　本実施の形態に係るアンテナ装置１では、第１エレメント５１と第３エレメント９１の電気長を等しく、また第２エレメント５２と第４エレメント９２の電気長を等しくしており、この結果、第２の周波数ｆ２と第４の周波数ｆ４が等しく、かつ、第３の周波数ｆ３と第５の周波数ｆ５が等しくなっている。なお、第１エレメント５１と第２エレメント５２及び第３エレメント９１と第４エレメント９２それぞれを同じ電気長とすることも可能である。例えば、第１エレメント５１と第２エレメント５２の電気長をλ／４とし、第３エレメント９１と第４エレメント９２の電気長をλ／４としてもよい。 In the antenna device 1 according to the present embodiment, the first element 51 and the third element 91 have the same electrical length, and the second element 52 and the fourth element 92 have the same electrical length. The frequency f2 and the fourth frequency f4 are equal, and the third frequency f3 and the fifth frequency f5 are equal. The first element 51 and the second element 52, and the third element 91 and the fourth element 92 can have the same electrical length. For example, the electrical length of the first element 51 and the second element 52 may be λ / 4, and the electrical length of the third element 91 and the fourth element 92 may be λ / 4.
　図２は、本実施の形態に係るアンテナ装置１の具体的な構成を示す斜視図である。同図において、長方形板状の誘電体１２とその右端部上下面それぞれに積層された金属板１３とからなる基板１４の表面側に第１，第２無線回路２，６及び第１，第２給電部３，７が実装されており、基板１４の表面側で、誘電体１２の露出部分に第１，第２アンテナ素子５，９がパターン形成されている。また、基板１４の表面側で、第１，第２給電部３，７と第１，第２アンテナ素子５，９の基端部（２つのエレメントの接続部分を基端部と呼ぶ）との間に第１，第２整合回路部４，８が実装されている。 FIG. 2 is a perspective view showing a specific configuration of the antenna device 1 according to the present embodiment. In the figure, first, second radio circuits 2, 6 and first, second are formed on the surface side of a substrate 14 comprising a rectangular plate-like dielectric 12 and a metal plate 13 laminated on the upper and lower surfaces of the right end portion thereof. Feeders 3 and 7 are mounted, and first and second antenna elements 5 and 9 are patterned on the exposed portion of the dielectric 12 on the surface side of the substrate 14. Further, on the surface side of the substrate 14, the first and second power feeding portions 3 and 7 and the base end portions of the first and second antenna elements 5 and 9 (the connecting portion of the two elements is referred to as the base end portion). The first and second matching circuit sections 4 and 8 are mounted therebetween.
　第１アンテナ素子５の第１エレメント５１，第２エレメント５２及び第２アンテナ素子９の第３エレメント９１，第４エレメント９２それぞれの長さを調整することで、所望周波数（即ち第１の周波数ｆ１）の低周波数側と高周波数側に共振を発生する。 By adjusting the length of each of the first element 51 and the second element 52 of the first antenna element 5 and the third element 91 and the fourth element 92 of the second antenna element 9, a desired frequency (that is, the first frequency f1) is adjusted. Resonance is generated on the low frequency side and the high frequency side.
　図３（ａ），（ｂ）は、本実施の形態に係るアンテナ装置１の周波数特性を示す図である。図３の（ａ）は、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）の周波数特性（二点鎖線）と、アドミタンス行列のＹ１２成分（ｍＳ）の虚部（Ｉｍ）の周波数特性（実線）である。第１エレメント５１の第２の周波数ｆ２と第３エレメント９１の第４の周波数ｆ４が共に同じ値の共振周波数となる。また、第２エレメント５２の第３の周波数ｆ３と第４エレメント９２の第５の周波数ｆ５が共に同じ値の共振周波数となる。第１アンテナ素子５及び第２アンテナ素子９の各エレメント５１，５２，９１，９２の長さを微調整して、所望周波数で、－１０ｍＳ≦Ｒｅ（Ｙ１２）≦＋１０ｍＳ、かつ－５ｍＳ≦Ｉｍ（Ｙ１２）≦＋５ｍＳとなるようにする。 3 (a) and 3 (b) are diagrams illustrating frequency characteristics of the antenna device 1 according to the present embodiment. FIG. 3A shows the frequency characteristic (two-dot chain line) of the real part (Re) of the Y12 component (mS) of the admittance matrix and the frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix ( (Solid line). The second frequency f2 of the first element 51 and the fourth frequency f4 of the third element 91 both have the same resonance frequency. Further, the third frequency f3 of the second element 52 and the fifth frequency f5 of the fourth element 92 both have the same resonance frequency. The lengths of the elements 51, 52, 91, 92 of the first antenna element 5 and the second antenna element 9 are finely adjusted, and at a desired frequency, −10 mS ≦ Re (Y12) ≦ + 10 mS and −5 mS ≦ Im ( Y12) ≦ + 5 mS.
　図３の（ｂ）は、結合を表すＳパラメータ（Ｓ１２）の周波数特性である。図３の（ａ）に示すように、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）が第１の周波数ｆ１で略０（ゼロ）、かつ、アドミタンス行列のＹ１２成分（ｍＳ）の虚部（Ｉｍ）が第１の周波数ｆ１で略０（ゼロ）になっている。即ち、本実施の形態に係るアンテナ装置１のようなアンテナ形状とすることで、第１の周波数ｆ１でアドミタンス行列のＹ１２成分（ｍＳ）の実部が略０（ゼロ）になり、かつ、アドミタンス行列のＹ１２成分（ｍＳ）の虚部が略０（ゼロ）になる。 (B) of FIG. 3 is a frequency characteristic of the S parameter (S12) representing the coupling. As shown in FIG. 3A, the real part (Re) of the Y12 component (mS) of the admittance matrix is substantially 0 (zero) at the first frequency f1, and the imaginary of the Y12 component (mS) of the admittance matrix. The part (Im) is substantially 0 (zero) at the first frequency f1. That is, by adopting an antenna shape like the antenna device 1 according to the present embodiment, the real part of the Y12 component (mS) of the admittance matrix becomes substantially 0 (zero) at the first frequency f1, and the admittance The imaginary part of the Y12 component (mS) of the matrix is substantially 0 (zero).
　図４は、アドミタンス行列のＹ１２成分の式を示す図である。同図に示す式において、αは振幅、φは位相、ｅは自然対数の底である。この式の四角の枠で囲んだ部分１５を（Ｒｅ（Ｙ１２）≒０）、かつ、（Ｉｍ（Ｙ１２）≒０）にすることで、Ｙ１２＝０となり、結果としてＳ１２（結合）＝０となる。本実施の形態に係るアンテナ装置１は、Ｒｅ（Ｙ１２）≒０、かつ、（Ｉｍ（Ｙ１２）≒０）を同時に満たすアンテナの形状を工夫することで実現している。 FIG. 4 is a diagram showing an expression of the Y12 component of the admittance matrix. In the equation shown in the figure, α is amplitude, φ is phase, and e is the base of natural logarithm. By setting the portion 15 surrounded by the square frame of this equation to (Re (Y12) ≈0) and (Im (Y12) ≈0), Y12 = 0, and as a result, S12 (coupling) = 0. Become. The antenna device 1 according to the present embodiment is realized by devising a shape of an antenna that simultaneously satisfies Re (Y12) ≈0 and (Im (Y12) ≈0).
　本実施の形態に係るアンテナ装置１の第１アンテナ素子５及び第２アンテナ素子９のそれぞれにおいて分岐エレメント長の差を大きくすることで、第１の周波数ｆ１における広帯域化が可能となる。図５は、第１アンテナ素子５及び第２アンテナ素子９のそれぞれにおいて、分岐エレメント長の差を大きくした例の基本構成を示す模式図である。同図に示す例では、第１アンテナ素子５の第２エレメント５２を長く、第１エレメント５１を短くしてその差を大きくし、また第２アンテナ素子９の第３エレメント９１を短く、第４エレメント９２を長くしてその差を大きくしたものである。なお、図５の例では、縦方向の長さを短くして小型化を図るため、第２エレメント５２と第４エレメント９２それぞれの先端部分を内側に直角に曲げている。また、図５では、第１，第２無線回路２，６及び第１，第２整合回路部４，８は省略している。 By increasing the difference between the branch element lengths in each of the first antenna element 5 and the second antenna element 9 of the antenna device 1 according to the present embodiment, it is possible to widen the band at the first frequency f1. FIG. 5 is a schematic diagram showing a basic configuration of an example in which the difference in branch element length is increased in each of the first antenna element 5 and the second antenna element 9. In the example shown in the figure, the second element 52 of the first antenna element 5 is lengthened, the first element 51 is shortened to increase the difference, the third element 91 of the second antenna element 9 is shortened, and the fourth element The element 92 is lengthened to increase the difference. In the example of FIG. 5, in order to reduce the size by reducing the length in the vertical direction, the tip portions of the second element 52 and the fourth element 92 are bent inward at right angles. In FIG. 5, the first and second radio circuits 2 and 6 and the first and second matching circuit units 4 and 8 are omitted.
　図６（ａ），（ｂ）は、第１アンテナ素子５及び第２アンテナ素子９のそれぞれにおいて、分岐エレメント長の差を大きくした場合の周波数特性を示す図である。図６の（ａ）は、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）の周波数特性（二点鎖線）と、アドミタンス行列のＹ１２成分（ｍＳ）の虚部（Ｉｍ）の周波数特性（実線）であり、図６の（ｂ）は、結合を表すＳパラメータ（Ｓ１２）の周波数特性である。図６の（ｂ）に示すように、第１の周波数ｆ１で結合を表すＳパラメータ（Ｓ１２）が、前述した図３の（ｂ）の場合と比べて広帯域化していることが分かる（広くなっているのが分かる）。 FIGS. 6A and 6B are diagrams showing frequency characteristics when the difference in branch element length is increased in each of the first antenna element 5 and the second antenna element 9. FIG. 6A shows the frequency characteristic (two-dot chain line) of the real part (Re) of the Y12 component (mS) of the admittance matrix and the frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix ( (B) in FIG. 6 is a frequency characteristic of the S parameter (S12) representing the coupling. As shown in FIG. 6B, it can be seen that the S parameter (S12) representing the coupling at the first frequency f1 has a wider bandwidth than the case of FIG. You can see)
　このように実施の形態１に係るアンテナ装置１によれば、第１アンテナ素子５を、第２の周波数ｆ２において電気長でλ／４となる第１エレメント５１と、第３の周波数ｆ３において電気長で３λ／４の第２エレメント５２の２分岐形状とし、第１エレメント５１と第２エレメント５２を第１給電部３付近で電気的に接続し、第１給電部３を、第２の周波数ｆ２で整合させる第１整合回路部４を介して第１アンテナ素子５に接続し、第２の周波数ｆ２を第１の周波数ｆ１より高周波とし、かつ、第１の周波数ｆ１を第３の周波数ｆ３より高周波とし、第２アンテナ素子９を、第４の周波数ｆ４において電気長でλ／４となる第３エレメント９１と、第５の周波数ｆ５において電気長で３λ／４の第４エレメント９２の２分岐形状とし、第３エレメント９１と第４エレメント９２を第２給電部７付近で電気的に接続し、第２給電部７を、第４の周波数ｆ４で整合させる第２整合回路部８を介して第２アンテナ素子９に接続し、第４の周波数ｆ４を第１の周波数ｆ１より高周波とし、かつ、第１の周波数ｆ１を第５の周波数ｆ５より高周波としたので、第１，第２アンテナ素子５，９間の距離を離したり、集中定数部品（第１，第２アンテナ素子５，９間の結合を低減させるための部品）を用いてアンテナ素子５，９間を接続したりせずとも、第１，第２アンテナ素子５，９間を低結合化できる。また、第１，第２アンテナ素子５，９間にスタブを配置することなく第１，第２アンテナ素子５，９を近接配置することができ、スタブにかかる費用を低減できる。即ち、従来よりも低コスト、低損失で低結合化ができる。この結果、アンテナ効率の向上、相関係数の低減が図れる。 As described above, according to the antenna device 1 according to the first embodiment, the first antenna element 5 is electrically connected to the first element 51 having the electrical length of λ / 4 at the second frequency f2 and the third frequency f3. The second element 52 having a length of 3λ / 4 has a two-branch shape, the first element 51 and the second element 52 are electrically connected in the vicinity of the first power feeding unit 3, and the first power feeding unit 3 is connected to the second frequency. It is connected to the first antenna element 5 via the first matching circuit section 4 to be matched at f2, the second frequency f2 is set to be higher than the first frequency f1, and the first frequency f1 is set to the third frequency f3. The second antenna element 9 has a higher frequency, and the second element 9 has a third element 91 having an electrical length of λ / 4 at the fourth frequency f4 and a second element 92 having an electrical length of 3λ / 4 at the fifth frequency f5. The third shape Element 91 and fourth element 92 are electrically connected in the vicinity of second power feeding portion 7, and second antenna element 9 is passed through second matching circuit portion 8 for matching second power feeding portion 7 at fourth frequency f4. And the fourth frequency f4 is higher than the first frequency f1, and the first frequency f1 is higher than the fifth frequency f5, so that the first and second antenna elements 5 and 9 are connected to each other. The first and first antennas can be connected without separating the antenna elements 5 and 9 using lumped constant components (components for reducing the coupling between the first and second antenna elements 5 and 9). The low coupling between the two antenna elements 5 and 9 can be achieved. Moreover, the 1st, 2nd antenna elements 5 and 9 can be arrange | positioned closely without arrange | positioning a stub between the 1st, 2nd antenna elements 5 and 9, and the expense concerning a stub can be reduced. That is, the coupling can be reduced at a lower cost and with a lower loss than in the past. As a result, the antenna efficiency can be improved and the correlation coefficient can be reduced.
　なお、実施の形態１に係るアンテナ装置１では、第１，第２アンテナ素子５，９を基板１４の長手方向に平行に配置し、第１エレメント５１と第３エレメント９１を同じ電気長とするとともに、第２エレメント５２と第４エレメント９２を同じ電気長としたが、このような分岐構造に限定されるものではなく、様々なパターンが考えられる。以下、パターンの異なる様々な変形例を挙げる。 In the antenna device 1 according to the first embodiment, the first and second antenna elements 5 and 9 are arranged in parallel to the longitudinal direction of the substrate 14, and the first element 51 and the third element 91 have the same electrical length. In addition, although the second element 52 and the fourth element 92 have the same electrical length, the invention is not limited to such a branched structure, and various patterns are conceivable. Hereinafter, various modified examples having different patterns will be described.
　（変形例１－１）
　図７は、図１のアンテナ装置１の変形例１－１であるアンテナ装置２０の具体的な構成を示す斜視図である。同図において、変形例１－１のアンテナ装置２０は、第１，第２アンテナ素子５Ｂ，９Ｂを基板１４の短手方向に向けて配置したものである。第１，第２アンテナ素子５Ｂ，９Ｂそれぞれの分岐構造は図１のアンテナ装置１と同様である。即ち、第１アンテナ素子５Ｂにおいては、第１エレメント５１Ｂと第２エレメント５２Ｂを有し、第２アンテナ素子９Ｂにおいては、第１エレメント９１Ｂと第２エレメント９２Ｂを有する。このような分岐構造としても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-1)
FIG. 7 is a perspective view showing a specific configuration of an antenna device 20 which is a modified example 1-1 of the antenna device 1 of FIG. In the figure, the antenna device 20 of Modification 1-1 has first and second antenna elements 5B and 9B arranged in the short direction of the substrate 14. The branch structures of the first and second antenna elements 5B and 9B are the same as those of the antenna device 1 of FIG. That is, the first antenna element 5B includes a first element 51B and a second element 52B, and the second antenna element 9B includes a first element 91B and a second element 92B. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－２）
　図８は、図１のアンテナ装置１の変形例１－２であるアンテナ装置２１の具体的な構成を示す斜視図である。同図において、変形例１－２のアンテナ装置２１は、長い方のエレメントを短い方のエレメントの途中から分岐させた構造を採っている。即ち、第１アンテナ素子５Ｃにおいては、第２エレメント５２Ｃを第１エレメント５１Ｃの途中から分岐させており、第２アンテナ素子９Ｃにおいては、第４エレメント９２Ｃを第３エレメント９１Ｃの途中から分岐させている。このような分岐構造としても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-2)
FIG. 8 is a perspective view showing a specific configuration of an antenna device 21 which is a modified example 1-2 of the antenna device 1 of FIG. In the figure, the antenna device 21 of Modification 1-2 employs a structure in which the longer element is branched from the middle of the shorter element. That is, in the first antenna element 5C, the second element 52C is branched from the middle of the first element 51C, and in the second antenna element 9C, the fourth element 92C is branched from the middle of the third element 91C. Yes. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－３）
　図９は、図１のアンテナ装置１の変形例１－３であるアンテナ装置２２の具体的な構成を示す斜視図である。同図において、変形例１－３のアンテナ装置２２は、第１，第２アンテナ素子５Ｄ，９Ｄを基板１４の短手方向に向けて配置し、さらに、前述した変形例１－２のアンテナ装置２１（図８参照）と同様に、長い方のエレメントを短い方のエレメントの途中から分岐させた構造を採っている。即ち、第１アンテナ素子５Ｄにおいては、第２エレメント５２Ｄを第１エレメント５１Ｄの途中から分岐させており、第２アンテナ素子９Ｄにおいては、第４エレメント９２Ｄを第３エレメント９１Ｄの途中から分岐させている。このような分岐構造としても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-3)
FIG. 9 is a perspective view showing a specific configuration of an antenna device 22 which is a modified example 1-3 of the antenna device 1 of FIG. In the figure, an antenna device 22 of Modification 1-3 has first and second antenna elements 5D and 9D arranged in the short direction of the substrate 14, and further, the antenna device of Modification 1-2 described above. Similarly to 21 (see FIG. 8), a structure in which the longer element is branched from the middle of the shorter element is employed. That is, in the first antenna element 5D, the second element 52D is branched from the middle of the first element 51D, and in the second antenna element 9D, the fourth element 92D is branched from the middle of the third element 91D. Yes. Even with such a branched structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－４）
　図１０は、図１のアンテナ装置１の変形例１－４であるアンテナ装置２３の具体的な構成を示す斜視図である。同図において、変形例１－４のアンテナ装置２３は、前述した実施の形態１に係るアンテナ装置１（図２参照）の第１アンテナ素子５を市販のチップアンテナ１６に置き換えたものである。第１アンテナ素子５をチップアンテナ１６に置き換えても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-4)
FIG. 10 is a perspective view showing a specific configuration of an antenna device 23 which is a modified example 1-4 of the antenna device 1 of FIG. In the figure, an antenna device 23 of Modification 1-4 is obtained by replacing the first antenna element 5 of the antenna device 1 according to Embodiment 1 (see FIG. 2) with a commercially available chip antenna 16. Even if the first antenna element 5 is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－５）
　図１１は、図１のアンテナ装置１の変形例１－５であるアンテナ装置２４の具体的な構成を示す斜視図である。同図において、変形例１－５のアンテナ装置２４は、前述した変形例１－１のアンテナ装置２０（図７参照）の第１アンテナ素子５Ｂを市販のチップアンテナ１６に置き換えたものである。チップアンテナ１６の配置方向は、第１アンテナ素子５Ｂの配置方向と同様に基板１４の短手方向である。第１アンテナ素子５Ｂをチップアンテナ１６に置き換えても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-5)
FIG. 11 is a perspective view showing a specific configuration of an antenna device 24 which is a modified example 1-5 of the antenna device 1 of FIG. In the figure, an antenna device 24 of Modification 1-5 is obtained by replacing the first antenna element 5B of the antenna device 20 of Modification 1-1 (see FIG. 7) with a commercially available chip antenna 16. The arrangement direction of the chip antenna 16 is the short direction of the substrate 14 as in the arrangement direction of the first antenna element 5B. Even if the first antenna element 5B is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－６）
　図１２は、図１のアンテナ装置１の変形例１－６であるアンテナ装置２５の具体的な構成を示す斜視図である。同図において、変形例１－６のアンテナ装置２５は、前述した変形例１－２のアンテナ装置２１（図８参照）の第１アンテナ素子５Ｃを市販のチップアンテナ１６に置き換えたものである。このチップアンテナ１６の配置方向は、第１アンテナ素子５Ｃの配置方向と同様に基板１４の長手方向である。第１アンテナ素子５Ｃをチップアンテナ１６に置き換えても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-6)
FIG. 12 is a perspective view showing a specific configuration of an antenna device 25 which is a modified example 1-6 of the antenna device 1 of FIG. In the figure, an antenna device 25 of Modification 1-6 is obtained by replacing the first antenna element 5C of the antenna device 21 of Modification 1-2 (see FIG. 8) with a commercially available chip antenna 16. The arrangement direction of the chip antenna 16 is the longitudinal direction of the substrate 14 similarly to the arrangement direction of the first antenna element 5C. Even if the first antenna element 5C is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－７）
　図１３は、図１のアンテナ装置１の変形例１－７であるアンテナ装置２６の具体的な構成を示す斜視図である。同図において、変形例１－７のアンテナ装置２６は、前述した変形例１－３のアンテナ装置２２（図９参照）の第１アンテナ素子５Ｄを市販のチップアンテナ１６に置き換えたものである。チップアンテナ１６の配置方向は、第１アンテナ素子５Ｄの配置方向と同様に基板１４の短手方向である。第１アンテナ素子５Ｄをチップアンテナ１６に置き換えても図１のアンテナ装置１と同様の効果が得られる。 (Modification 1-7)
FIG. 13 is a perspective view showing a specific configuration of an antenna device 26 which is a modified example 1-7 of the antenna device 1 of FIG. In the figure, an antenna device 26 of Modification 1-7 is obtained by replacing the first antenna element 5D of the antenna device 22 of Modification 1-3 described above (see FIG. 9) with a commercially available chip antenna 16. The arrangement direction of the chip antenna 16 is the short direction of the substrate 14 in the same manner as the arrangement direction of the first antenna element 5D. Even if the first antenna element 5D is replaced with the chip antenna 16, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－８）
　図１４は、図１のアンテナ装置１の変形例１－８であるアンテナ装置２７の具体的な構成を示す斜視図である。同図において、変形例１－８のアンテナ装置２７は、前述した実施の形態１に係るアンテナ装置１（図２参照）の第２エレメント５２及び第４エレメント９２のそれぞれをメアンダ形状としたものである。なお、同図において、第１アンテナ素子に対して“５Ｅ”を、第１エレメントに対して“５１Ｅ”を、第２エレメントに対して“５２Ｅ”を、第２アンテナ素子に対して“９Ｅ”を、第３エレメントに対して“９１Ｅ”を、第４エレメントに対して“９２Ｅ”をそれぞれ付している。 (Modification 1-8)
FIG. 14 is a perspective view showing a specific configuration of an antenna device 27 which is a modified example 1-8 of the antenna device 1 of FIG. In the figure, an antenna device 27 of Modification 1-8 is configured such that each of the second element 52 and the fourth element 92 of the antenna device 1 (see FIG. 2) according to Embodiment 1 described above has a meander shape. is there. In the figure, “5E” for the first antenna element, “51E” for the first element, “52E” for the second element, and “9E” for the second antenna element. , “91E” is attached to the third element, and “92E” is attached to the fourth element.
　この変形例１－８のアンテナ装置２７では、第２エレメント５２Ｅ及び第４エレメント９２Ｅそれぞれの電気長を、アンテナ装置１の第２エレメント５２及び第４エレメント９２それぞれの電気長より長くしている。第２エレメント５２Ｅ及び第４エレメント９２Ｅのそれぞれをメアンダ形状としても図１のアンテナ装置１と同様の効果が得られる。 In the antenna device 27 of this modification 1-8, the electrical lengths of the second element 52E and the fourth element 92E are longer than the electrical lengths of the second element 52 and the fourth element 92 of the antenna device 1, respectively. Even if each of the second element 52E and the fourth element 92E has a meander shape, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－９）
　図１５は、図１のアンテナ装置１の変形例１－９であるアンテナ装置２８の具体的な構成を示す斜視図である。同図において、変形例１－９のアンテナ装置２８は、前述した変形例１－２のアンテナ装置２１（図８参照）の第２エレメント５２Ｃと第４エレメント９２Ｃのそれぞれをメアンダ形状としたものである。なお、同図において、第１アンテナ素子に対して“５Ｆ”を、第１エレメントに対して“５１Ｆ”を、第２エレメントに対して“５２Ｆ”を、第２アンテナ素子に対して“９Ｆ”を、第３エレメントに対して“９１Ｆ”を、第４エレメントに対して“９２Ｆ”をそれぞれ付している。 (Modification 1-9)
FIG. 15 is a perspective view showing a specific configuration of an antenna device 28 which is a modified example 1-9 of the antenna device 1 of FIG. In the figure, the antenna device 28 of Modification 1-9 has a meander shape in each of the second element 52C and the fourth element 92C of the antenna device 21 (see FIG. 8) of Modification 1-2. is there. In the figure, “5F” for the first antenna element, “51F” for the first element, “52F” for the second element, and “9F” for the second antenna element. , “91F” is attached to the third element, and “92F” is attached to the fourth element.
　この変形例１－９のアンテナ装置２８では、第２エレメント５２Ｆ及び第４エレメント９２Ｆそれぞれの電気長を、アンテナ装置２１の第２エレメント５２Ｃ及び第４エレメント９２Ｃそれぞれの電気長より長くしている。第２エレメント５２Ｆ及び第４エレメント９２Ｆのそれぞれをメアンダ形状としても図１のアンテナ装置１と同様の効果が得られる。 In the antenna device 28 of the modification 1-9, the electrical lengths of the second element 52F and the fourth element 92F are longer than the electrical lengths of the second element 52C and the fourth element 92C of the antenna device 21, respectively. Even if each of the second element 52F and the fourth element 92F has a meander shape, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　（変形例１－１０）
　図１６は、図１のアンテナ装置１の変形例１－１０であるアンテナ装置２９の具体的な構成を示す斜視図である。同図において、変形例１－１０のアンテナ装置２９は、前述した実施の形態１に係るアンテナ装置１（図２参照）の第１アンテナ素子５の長さを第２アンテナ素子９より短くして左右非対称にしたものである。即ち、第１アンテナ素子５の第１エレメント５１の長さを第２アンテナ素子９の第３エレメント９１の長さより短く、また第１アンテナ素子５の第２エレメント５２の長さを第２アンテナ素子９の第４エレメント９２の長さより短くしたものである。なお、同図において、第１アンテナ素子に対して“５Ｇ”を、第１エレメントに対して“５１Ｇ”を、第２エレメントに対して“５２Ｇ”をそれぞれ付している。 (Modification 1-10)
FIG. 16 is a perspective view showing a specific configuration of an antenna device 29 which is a modified example 1-10 of the antenna device 1 of FIG. In the figure, an antenna device 29 of Modification 1-10 is configured so that the length of the first antenna element 5 of the antenna device 1 according to Embodiment 1 (see FIG. 2) is shorter than that of the second antenna element 9. It is asymmetrical. That is, the length of the first element 51 of the first antenna element 5 is shorter than the length of the third element 91 of the second antenna element 9, and the length of the second element 52 of the first antenna element 5 is set to the second antenna element. 9 is made shorter than the length of the fourth element 92. In the figure, “5G” is attached to the first antenna element, “51G” is attached to the first element, and “52G” is attached to the second element.
　第１エレメント５１Ｇ、第２エレメント５２Ｇ、第３エレメント９１及び第４エレメント９２それぞれの長さを変えることで、第２の周波数ｆ２と第４の周波数ｆ４が異なる値になり（ｆ２≠ｆ４）、また第３の周波数ｆ３と第５の周波数ｆ５も異なる値になる（ｆ３≠ｆ５）ので、共振点が４つになる。但し、第１の周波数ｆ１に変化はない。第１エレメント５１Ｇ、第２エレメント５２Ｇ、第３エレメント９１及び第４エレメント９２それぞれの長さを変えることで共振点が４つになるが、得られる効果は図１のアンテナ装置１と同様である。 By changing the lengths of the first element 51G, the second element 52G, the third element 91, and the fourth element 92, the second frequency f2 and the fourth frequency f4 become different values (f2 ≠ f4), Further, since the third frequency f3 and the fifth frequency f5 have different values (f3 ≠ f5), there are four resonance points. However, there is no change in the first frequency f1. By changing the length of each of the first element 51G, the second element 52G, the third element 91, and the fourth element 92, four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
　（変形例１－１１）
　図１７は、図１のアンテナ装置１の変形例１－１１であるアンテナ装置３０の具体的な構成を示す斜視図である。同図において、変形例１－１１のアンテナ装置３０は、前述した実施の形態１に係るアンテナ装置１（図２参照）の第２アンテナ素子９と、前述した変形例１－１であるアンテナ装置２０（図７参照）の第１アンテナ素子５Ｂを組み合わせて、方向が異なる非対称にしたものである。即ち、第２アンテナ素子９を基板１４の長手方向に向けて配置し、第１アンテナ素子５Ｂを基板１４の短手方向に向けて配置したものである。この変形例１－１１のアンテナ装置３０も前述した変形例１－１０のアンテナ装置２９と同様に、第１エレメント５１Ｂ、第２エレメント５２Ｂ、第３エレメント９１及び第４エレメント９２それぞれの長さが異なるので、共振点が４つになる。但し、第１の周波数ｆ１は変わらない。第１エレメント５１Ｂ、第２エレメント５２Ｂ、第３エレメント９１及び第４エレメント９２それぞれの長さを変えることで共振点が４つになるが、得られる効果は図１のアンテナ装置１と同様である。 (Modification 1-11)
FIG. 17 is a perspective view showing a specific configuration of an antenna device 30 which is a modified example 1-11 of the antenna device 1 of FIG. In the figure, the antenna device 30 of Modification 1-11 includes the second antenna element 9 of the antenna device 1 (see FIG. 2) according to Embodiment 1 described above and the antenna device of Modification 1-1 described above. 20 (refer to FIG. 7) first antenna elements 5B are combined to be asymmetric in different directions. That is, the second antenna element 9 is arranged in the longitudinal direction of the substrate 14 and the first antenna element 5B is arranged in the short direction of the substrate 14. Similarly to the antenna device 29 of Modification 1-10 described above, the lengths of the first element 51B, the second element 52B, the third element 91, and the fourth element 92 are the same as those of the antenna device 30 of Modification 1-11. Since they are different, there are four resonance points. However, the first frequency f1 does not change. By changing the length of each of the first element 51B, the second element 52B, the third element 91, and the fourth element 92, four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
　（変形例１－１２）
　図１８は、図１のアンテナ装置１の変形例１－１２であるアンテナ装置３１の具体的な構成を示す斜視図である。同図において、変形例１－１２のアンテナ装置３１は、前述した変形例１－２のアンテナ装置２１（図８参照）の第１アンテナ素子５Ｃの長さを第２アンテナ素子９Ｃより短くして左右非対称にしたものである。即ち、第１アンテナ素子５Ｃの第１エレメント５１Ｃの長さを第２アンテナ素子９Ｃの第３エレメント９１Ｃの長さより短く、また第１アンテナ素子５Ｃの第２エレメント５２Ｃの長さを第２アンテナ素子９Ｃの第４エレメント９２Ｃの長さより短くしたものである。なお、同図において、第１アンテナ素子に対して“５Ｈ”を、第１エレメントに対して“５１Ｈ”を、第２エレメントに対して“５２Ｈ”をそれぞれ付している。 (Modification 1-12)
FIG. 18 is a perspective view showing a specific configuration of an antenna device 31 which is a modified example 1-12 of the antenna device 1 of FIG. In the figure, an antenna device 31 of Modification 1-12 has a length of the first antenna element 5C of the antenna device 21 of Modification 1-2 described above (see FIG. 8) shorter than that of the second antenna element 9C. It is asymmetrical. That is, the length of the first element 51C of the first antenna element 5C is shorter than the length of the third element 91C of the second antenna element 9C, and the length of the second element 52C of the first antenna element 5C is set to the second antenna element. This is shorter than the length of the 9C fourth element 92C. In the figure, “5H” is attached to the first antenna element, “51H” is attached to the first element, and “52H” is attached to the second element.
　第１エレメント５１Ｈ、第２エレメント５２Ｈ、第３エレメント９１Ｃ及び第４エレメント９２Ｃそれぞれの長さを変えることで、第３の周波数ｆ３と第５の周波数ｆ５が異なる値になり（ｆ３≠ｆ５）、また第２の周波数ｆ２と第４の周波数ｆ４も異なる値になる（ｆ２≠ｆ４）ので、共振点が４つになる。但し、第１の周波数ｆ１に変化はない。第１エレメント５１Ｈ、第２エレメント５２Ｈ、第３エレメント９１Ｃ及び第４エレメント９２Ｃそれぞれの長さを変えることで共振点が４つになるが、得られる効果は図１のアンテナ装置１と同様である。 By changing the lengths of the first element 51H, the second element 52H, the third element 91C, and the fourth element 92C, the third frequency f3 and the fifth frequency f5 become different values (f3 ≠ f5), Further, since the second frequency f2 and the fourth frequency f4 have different values (f2 ≠ f4), there are four resonance points. However, there is no change in the first frequency f1. By changing the length of each of the first element 51H, the second element 52H, the third element 91C, and the fourth element 92C, four resonance points are obtained, but the obtained effect is the same as that of the antenna device 1 of FIG. .
　（変形例１－１３）
　図１９は、図１のアンテナ装置１の変形例１－１３であるアンテナ装置３２の具体的な構成を示す斜視図である。同図において、アンテナ装置３２は、前述した変形例１－２であるアンテナ装置２１（図８参照）の第２アンテナ素子９Ｃと、前述した変形例１－３であるアンテナ装置２２（図９参照）の第１アンテナ素子５Ｄを組み合わせて、方向が異なる非対称にしたものである。即ち、第２アンテナ素子９Ｃを基板１４の長手方向に向けて配置し、第１アンテナ素子５Ｄを基板１４の短手方向に向けて配置したものである。この変形例１－１３のアンテナ装置３２も前述した変形例１－１０のアンテナ装置２９（図１６参照）と同様に、第１エレメント５１Ｄ、第２エレメント５２Ｄ、第３エレメント９１Ｃ及び第４エレメント９２Ｃそれぞれの長さが異なるので、共振点が４つになる。但し、第１の周波数ｆ１に変化はない。第１エレメント５１Ｄ、第２エレメント５２Ｄ、第３エレメント９１Ｃ及び第４エレメント９２Ｃそれぞれの長さを変えることで共振点が４つになるが、得られる効果は図１のアンテナ装置１と同様である。 (Modification 1-13)
FIG. 19 is a perspective view showing a specific configuration of an antenna device 32 which is a modified example 1-13 of the antenna device 1 of FIG. In the figure, an antenna device 32 includes a second antenna element 9C of the antenna device 21 (see FIG. 8) which is the above-described modification example 1-2, and an antenna device 22 (see FIG. 9) which is the above-described modification example 1-3. ) Of the first antenna element 5D to make the directions different asymmetrical. That is, the second antenna element 9C is arranged in the longitudinal direction of the substrate 14, and the first antenna element 5D is arranged in the short direction of the substrate 14. Similarly to the antenna device 29 (see FIG. 16) of Modification 1-10 described above, the antenna device 32 of Modification 1-13 also includes the first element 51D, the second element 52D, the third element 91C, and the fourth element 92C. Since each length is different, there are four resonance points. However, there is no change in the first frequency f1. By changing the length of each of the first element 51D, the second element 52D, the third element 91C, and the fourth element 92C, four resonance points are obtained. The obtained effect is the same as that of the antenna device 1 of FIG. .
　（実施の形態２）
　図２０は、本発明の実施の形態２に係るアンテナ装置の基本的な構成を示す模式図である。なお、同図では無線回路及び整合回路部を省略しているが、これらは前述した実施の形態１に係るアンテナ装置１のものと同じものである。 (Embodiment 2)
FIG. 20 is a schematic diagram showing a basic configuration of an antenna apparatus according to Embodiment 2 of the present invention. In the figure, the radio circuit and the matching circuit unit are omitted, but these are the same as those of the antenna device 1 according to the first embodiment described above.
　本実施の形態に係るアンテナ装置４０は、３分岐構造の第１，第２アンテナ素子４１，４２を有する。第１アンテナ素子４１は、第１エレメント４１０，第２エレメント４１１，第３エレメント４１２を有し、第２アンテナ素子４２は、第４エレメント４２０，第５エレメント４２１，第６エレメント４２２を有している。各エレメントの長さの大小関係は、第１アンテナ素子４１においては、第１エレメント４１０＜第２エレメント４１１＜第３エレメント４１２となっており、第２アンテナ素子４２においては、第４エレメント４２０＜第５エレメント４２１＜第６エレメント４２２となっている。この場合、エレメントの長さの差を大きくすると広帯域になり、小さくすると狭帯域となる。本実施の形態に係るアンテナ装置４０の場合、第１エレメント４１０と第２エレメント４１１及び第４エレメント４２０と第５エレメント４２１それぞれにおける長さの差を大きく、第２エレメント４１１と第３エレメント４１２及び第５エレメント４２１と第６エレメント４２２それぞれにおける長さの差を小さくしている。 The antenna device 40 according to the present embodiment includes first and second antenna elements 41 and 42 having a three-branch structure. The first antenna element 41 includes a first element 410, a second element 411, and a third element 412, and the second antenna element 42 includes a fourth element 420, a fifth element 421, and a sixth element 422. Yes. In the first antenna element 41, the length relationship of each element is such that the first element 410 <the second element 411 <the third element 412, and the second antenna element 42 has the fourth element 420 < The fifth element 421 <the sixth element 422. In this case, when the difference in element length is increased, the band is widened, and when it is decreased, the band is narrowed. In the case of the antenna device 40 according to the present embodiment, the difference in length between the first element 410 and the second element 411 and the fourth element 420 and the fifth element 421 is large, and the second element 411 and the third element 412 and The difference in length between the fifth element 421 and the sixth element 422 is reduced.
　図２１は、本実施の形態に係るアンテナ装置４０の具体的な構成を示す斜視図である。同図において、基板１４の金属板１３側の表面上に第１，第２無線回路２，６及び第１，第２給電部３，７が実装されている。また、基板１４を構成する誘電体１２の表面上で、基板１４の長手方向に向けて第１，第２アンテナ素子４１，４２がパターン形成されている。また、基板１４の表面上で、第１，第２給電部３，７と第１，第２アンテナ素子４１，４２の基端部との間に第１，第２整合回路部４，８が実装されている。 FIG. 21 is a perspective view showing a specific configuration of the antenna device 40 according to the present embodiment. In the figure, first and second radio circuits 2 and 6 and first and second power feeding units 3 and 7 are mounted on the surface of the substrate 14 on the metal plate 13 side. The first and second antenna elements 41 and 42 are patterned on the surface of the dielectric 12 constituting the substrate 14 in the longitudinal direction of the substrate 14. Further, on the surface of the substrate 14, the first and second matching circuit portions 4 and 8 are provided between the first and second feeding portions 3 and 7 and the base end portions of the first and second antenna elements 41 and 42. Has been implemented.
　図２２（ａ），（ｂ）は、本実施の形態に係るアンテナ装置４０の周波数特性を示す図である。同図の（ａ）は、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）の周波数特性である。また、同図の（ｂ）は、アドミタンス行列のＹ１２成分（ｍＳ）の虚部（Ｉｍ）の周波数特性である。また、図２３は、図２２の（ａ）の周波数特性と（ｂ）の周波数特性を重ね合わせた図である。第１エレメント４１０の第２の周波数ｆ２と第４エレメント４２０の第５の周波数ｆ５が共に同じ値の共振周波数となり、また第２エレメント４１１の第３の周波数ｆ３と第５エレメント４２１の第６の周波数ｆ６が共に同じ値の共振周波数となり、また第３エレメント４１２の第４の周波数ｆ４と第６エレメント４２２の第７の周波数ｆ７が共に同じ値の共振周波数となる。 22 (a) and 22 (b) are diagrams illustrating frequency characteristics of the antenna device 40 according to the present embodiment. (A) of the same figure is a frequency characteristic of the real part (Re) of Y12 component (mS) of an admittance matrix. Moreover, (b) of the figure is a frequency characteristic of the imaginary part (Im) of the Y12 component (mS) of the admittance matrix. FIG. 23 is a diagram in which the frequency characteristics of (a) and (b) of FIG. 22 are superimposed. The second frequency f2 of the first element 410 and the fifth frequency f5 of the fourth element 420 are both the same resonance frequency, and the third frequency f3 of the second element 411 and the sixth frequency f5 of the fifth element 421 are the same. Both the frequencies f6 have the same resonance frequency, and the fourth frequency f4 of the third element 412 and the seventh frequency f7 of the sixth element 422 both have the same resonance frequency.
　図２４は、結合を表すＳパラメータ（Ｓ１２）の周波数特性を示す図である。図２２の（ａ）又は図２３に示すように、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）が第１の周波数ｆ１（１．５ＧＨｚ）と、２．５ＧＨｚの２つの周波数で略０（ゼロ、ｍＳ）となる。即ち、第１の周波数ｆ１の１．５ＧＨｚと２．５ＧＨｚの２つの周波数でアドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）が略０（ゼロ）になる。また、図２２の（ｂ）又は図２３に示すように、アンテナ形状のみでＩｍ（Ｙ１２）＝０が得られる。このように、３分岐構造とすることで、２つの周波数（１．５ＧＨｚと２．５ＧＨｚ）の結合低減に対応することができる。 FIG. 24 is a diagram showing the frequency characteristics of the S parameter (S12) representing coupling. As shown in FIG. 22A or FIG. 23, the real part (Re) of the Y12 component (mS) of the admittance matrix is substantially equal to the first frequency f1 (1.5 GHz) and two frequencies of 2.5 GHz. 0 (zero, mS). That is, the real part (Re) of the Y12 component (mS) of the admittance matrix becomes approximately 0 (zero) at two frequencies of 1.5 GHz and 2.5 GHz of the first frequency f1. Further, as shown in FIG. 22B or FIG. 23, Im (Y12) = 0 is obtained only by the antenna shape. As described above, the three-branch structure can cope with a reduction in coupling between two frequencies (1.5 GHz and 2.5 GHz).
　図２４において、第２エレメント４１１と第３エレメント４１２及び第５エレメント４２１と第６エレメント４２２それぞれの長さの差を大きくすることで、１．５ＧＨｚ帯を広帯域化でき、それぞれの長さの差を小さくすることで同帯域を狭帯域化できる。一方、第１エレメント４１０と第２エレメント４１１及び第４エレメント４２０と第５エレメント４２１それぞれの長さの差を大きくすることで、２．５ＧＨｚ帯を広帯域化でき、それぞれの長さの差を小さくすることで同帯域を狭帯域化できる。図２５（ａ），（ｂ）は、アドミタンス行列のＹ１２成分（ｍＳ）の実部（Ｒｅ）と虚部（Ｉｍ）の条件を示す図であり、（ａ）は実部（Ｒｅ）の条件、（ｂ）は虚部（Ｉｍ）の条件である。同図に示すように、実部（Ｒｅ）は、－１０ｍＳ≦Ｒｅ（Ｙ１２）≦＋１０ｍＳを満たす必要があり、虚部（Ｉｍ）は、－５ｍＳ≦Ｉｍ（Ｙ１２）≦＋５ｍＳの条件を満たす必要がある。これらの条件を満たすことで、第１アンテナ素子４１と第２アンテナ素子４２の結合を低減できる。 In FIG. 24, by increasing the difference in length between the second element 411 and the third element 412, and between the fifth element 421 and the sixth element 422, the 1.5 GHz band can be widened. By reducing the frequency, the same band can be narrowed. On the other hand, by increasing the difference in length between the first element 410 and the second element 411 and between the fourth element 420 and the fifth element 421, the 2.5 GHz band can be widened, and the difference in length between the elements is reduced. By doing so, the same band can be narrowed. FIGS. 25A and 25B are diagrams showing conditions of the real part (Re) and imaginary part (Im) of the Y12 component (mS) of the admittance matrix, and FIG. 25A shows the condition of the real part (Re). , (B) are conditions for the imaginary part (Im). As shown in the figure, the real part (Re) needs to satisfy −10 mS ≦ Re (Y12) ≦ + 10 mS, and the imaginary part (Im) needs to satisfy the condition −5 mS ≦ Im (Y12) ≦ + 5 mS. There is. By satisfying these conditions, the coupling between the first antenna element 41 and the second antenna element 42 can be reduced.
　このように、分岐数を増やすことで複数周波数での結合低減が可能となる。また、エレメント間の長さの差を調整することで、結合低減の周波数帯域を調整することができる。勿論分岐数を増やしても、前述した２分岐構造のアンテナ装置１と同様の効果は得られることは言うまでもない。 In this way, it is possible to reduce coupling at multiple frequencies by increasing the number of branches. Further, the frequency band for reducing coupling can be adjusted by adjusting the difference in length between elements. Of course, even if the number of branches is increased, it is needless to say that the same effect as that of the antenna apparatus 1 having the two-branch structure described above can be obtained.
　図２６は、図２１のアンテナ装置４０の変形例２であるアンテナ装置４３の具体的な構成を示す斜視図である。同図において、変形例２のアンテナ装置４３は、第１アンテナ素子４１Ｂにおいては、第１エレメント４１０Ｂの途中から第２エレメント４１１Ｂが分岐し、さらに第２エレメント４１１Ｂの途中から第３エレメント４１２Ｂが分岐した３分岐構造を採り、第２アンテナ素子４２Ｂにおいては、第４エレメント４２０Ｂの途中から第５エレメント４２１Ｂが分岐し、さらに第５エレメント４２１Ｂの途中から第６エレメント４２２Ｂが分岐した３分岐構造を採る。このような３分岐構造としても図１のアンテナ装置１と同様の効果が得られる。 FIG. 26 is a perspective view showing a specific configuration of an antenna device 43 which is a modified example 2 of the antenna device 40 of FIG. In the figure, in the antenna device 43 of Modification 2, in the first antenna element 41B, the second element 411B branches from the middle of the first element 410B, and further the third element 412B branches from the middle of the second element 411B. The second antenna element 42B employs a three-branch structure in which the fifth element 421B branches from the middle of the fourth element 420B, and the sixth element 422B branches from the middle of the fifth element 421B. . Even with such a three-branch structure, the same effect as the antenna device 1 of FIG. 1 can be obtained.
　次に、本発明のアンテナ装置の応用例について説明する。
　（応用例１）
　図２７は、実施の形態１に係るアンテナ装置１を用いた携帯無線端末の概観を示す斜視図である。同図に示す携帯無線端末６０では、筐体上部の右角部に第１アンテナ素子５と第２アンテナ素子９を筐体短手方向に近接配置している。 Next, application examples of the antenna device of the present invention will be described.
(Application 1)
FIG. 27 is a perspective view showing an overview of a portable wireless terminal using the antenna device 1 according to the first embodiment. In the portable wireless terminal 60 shown in the figure, the first antenna element 5 and the second antenna element 9 are arranged close to each other in the lateral direction of the casing at the right corner of the upper portion of the casing.
　（応用例２）
　図２８は、変形例１－１のアンテナ装置２０（図７参照）を用いた携帯無線端末の概観を示す斜視図である。同図に示す携帯無線端末６１では、筐体上部の中央部に第１アンテナ素子５Ｂと第２アンテナ素子９Ｂを近接配置している。この場合、第１アンテナ素子５Ｂと第２アンテナ素子９Ｂは、互いに背を向ける方向で配置している。 (Application example 2)
FIG. 28 is a perspective view showing an overview of a portable wireless terminal using the antenna device 20 (see FIG. 7) of Modification 1-1. In the portable wireless terminal 61 shown in the figure, the first antenna element 5B and the second antenna element 9B are arranged close to each other at the center of the upper part of the housing. In this case, the 1st antenna element 5B and the 2nd antenna element 9B are arrange | positioned in the direction which turns their backs.
　（応用例３）
　図２９は、変形例１－１のアンテナ装置２０（図７参照）の応用例を用いた携帯無線端末の概観を示す斜視図である。同図に示す携帯無線端末６２は、変形例１－１のアンテナ装置２０の第１アンテナ素子５Ｂ及び第２アンテナ素子９Ｂの配置方向を逆にしたものである。即ち、第１アンテナ素子５Ｂと第２アンテナ素子９Ｂが対向する方向にこれらを配置したものである。 (Application 3)
FIG. 29 is a perspective view showing an overview of a portable wireless terminal using an application example of the antenna device 20 (see FIG. 7) of Modification 1-1. The portable wireless terminal 62 shown in the figure is obtained by reversing the arrangement directions of the first antenna element 5B and the second antenna element 9B of the antenna device 20 of Modification 1-1. That is, the first antenna element 5B and the second antenna element 9B are arranged in the facing direction.
　本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
　本出願は、２０１２年１月６日出願の日本特許出願（特願２０１２－００１３０９）に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on a Japanese patent application filed on Jan. 6, 2012 (Japanese Patent Application No. 2012-001309), the contents of which are incorporated herein by reference.
　本発明は、複数のアンテナ素子におけるアンテナ素子間の結合を低減できるとともに、アンテナの効率向上、相関係数の低減が図れるといった効果を有し、複数のアンテナ素子を搭載する携帯無線端末などへの適用が可能である。 INDUSTRIAL APPLICABILITY The present invention can reduce the coupling between antenna elements in a plurality of antenna elements, and has the effect of improving the efficiency of the antenna and reducing the correlation coefficient. Applicable.
　１，２０，２１，２２，２３，２４，２５，２６，２７，２８，２９，３０，３１，３２，４０，４３　アンテナ装置
　２　第１無線回路
　３　第１給電部
　４　第１整合回路部
　５，５Ｂ，５Ｃ，５Ｄ，５Ｅ，５Ｆ，５Ｇ，５Ｈ，４１，４１Ｂ　第１アンテナ素子
　６　第２無線回路
　７　第２給電部
　８　第２整合回路部
　９，９Ｂ，９Ｃ，９Ｄ，９Ｅ，９Ｆ，４２，４２Ｂ　第２アンテナ素子
　１２　誘電体
　１３　金属板
　１４　基板
　１６　チップアンテナ
　５１，５１Ｂ，５１Ｃ，５１Ｄ，５１Ｅ，５１Ｆ，５１Ｇ，５１Ｈ，４１０，４１０Ｂ　第１エレメント
　５２，５２Ｂ，５２Ｃ，５２Ｄ，５２Ｅ，５２Ｆ，５２Ｇ，５２Ｈ，４１１，４１１Ｂ　第２エレメント
　６０，６１，６２　携帯無線端末
　９１，９１Ｂ，９１Ｃ，９１Ｄ，９１Ｅ，９１Ｆ，４１２，４１２Ｂ　第３エレメント
　９２，９２Ｂ，９２Ｃ，９２Ｄ，９２Ｅ，９２Ｆ，４２０，４２０Ｂ　第４エレメント
　４２１，４２１Ｂ　第５エレメント
　４２２，４２２Ｂ　第６エレメント 1, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 40, 43 Antenna device 2 First wireless circuit 3 First power feeding unit 4 First matching circuit unit 5 , 5B, 5C, 5D, 5E, 5F, 5G, 5H, 41, 41B First antenna element 6 Second wireless circuit 7 Second feeding unit 8 Second matching circuit unit 9, 9B, 9C, 9D, 9E, 9F, 42, 42B Second antenna element 12 Dielectric 13 Metal plate 14 Substrate 16 Chip antenna 51, 51B, 51C, 51D, 51E, 51F, 51G, 51H, 410, 410B First element 52, 52B, 52C, 52D, 52E, 52F, 52G, 52H, 411, 411B Second element 60, 61, 62 Portable wireless terminal 91, 91B, 91C, 91D, 91E, 91F, 412, 412B 3 element 92,92B, 92C, 92D, 92E, 92F, 420,420B fourth element 421,421B fifth element 422,422B sixth element

Claims (2)

  1. 　第１の周波数で動作する第１無線回路と、
    　前記第１無線回路に接続された第１給電部と、
    　前記第１給電部から給電される第１アンテナ素子と、
    　前記第１の周波数で動作する第２無線回路と、
    　前記第２無線回路に接続された第２給電部と、
    　前記第２給電部から給電される第２アンテナ素子と、を備え、
    　前記第１アンテナ素子は、第２の周波数において電気長でλ／４となる第１エレメントと、第３の周波数において電気長でλ／４または３λ／４の第２エレメントとからなり、
    　前記第１エレメントと前記第２エレメントとは、前記第１給電部付近で電気的に接続され、
    　前記第１給電部は、前記第２の周波数で整合させる第１整合回路部を介して前記第１アンテナ素子に接続され、
    　前記第２の周波数は前記第１の周波数より高周波であり、かつ、前記第１の周波数は前記第３の周波数より高周波であり、
    　前記第２アンテナ素子は、第４の周波数において電気長でλ／４となる第３エレメントと、第５の周波数において電気長でλ／４または３λ／４の第４エレメントとからなり、
    　前記第３エレメントと前記第４エレメントとは、前記第２給電部付近で電気的に接続され、
    　前記第２給電部は、前記第４の周波数で整合させる第２整合回路部を介して前記第２アンテナ素子に接続され、
    　前記第４の周波数は前記第１の周波数より高周波であり、かつ、前記第１の周波数は前記第５の周波数より高周波であることを特徴とするアンテナ装置。     A first radio circuit operating at a first frequency;
    A first power feeding unit connected to the first radio circuit;
    A first antenna element fed from the first feeding section;
    A second radio circuit operating at the first frequency;
    A second power feeding unit connected to the second radio circuit;
    A second antenna element fed from the second feeding unit,
    The first antenna element includes a first element having an electrical length of λ / 4 at a second frequency and a second element having an electrical length of λ / 4 or 3λ / 4 at a third frequency,
    The first element and the second element are electrically connected in the vicinity of the first power feeding unit,
    The first feeding unit is connected to the first antenna element through a first matching circuit unit that performs matching at the second frequency.
    The second frequency is higher than the first frequency, and the first frequency is higher than the third frequency;
    The second antenna element includes a third element having an electrical length of λ / 4 at a fourth frequency and a fourth element having an electrical length of λ / 4 or 3λ / 4 at a fifth frequency,
    The third element and the fourth element are electrically connected in the vicinity of the second power feeding unit,
    The second power feeding unit is connected to the second antenna element via a second matching circuit unit for matching at the fourth frequency,
    The antenna device, wherein the fourth frequency is higher than the first frequency, and the first frequency is higher than the fifth frequency.
  2. 　請求項１に記載のアンテナ装置であって、
    　前記第２の周波数と前記第４の周波数とは等しく、かつ、前記第３の周波数と前記第５の周波数とは等しいことを特徴とするアンテナ装置。     The antenna device according to claim 1,
    The antenna device, wherein the second frequency and the fourth frequency are equal, and the third frequency and the fifth frequency are equal.
PCT/JP2012/007683 2012-01-06 2012-11-29 Antenna device WO2013102967A1 (en)

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