JP2011130280A - Antenna and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and thin radio communication apparatus, an antenna having improved radiation characteristics, and a radio communication method. <P>SOLUTION: The radio communication apparatus 100 includes an antenna 91. The antenna 91 includes a ground plate 2 and a radiation element 3. The ground plate 2 is substantially rectangular and has long sides whose length is 1/4 wavelength of a frequency used or more and short sides whose length is less than the 1/4 wavelength of the frequency used, and has a notch 8 on one of the long sides at a distance shorter than the length of the short sides from a specific corner 2a of the rectangle. The radiation element 3 is connected to the specific corner 2a of the rectangle in the ground plate 2, and disposed along the long sides of the ground plate 2 in which the notch 8 is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an antenna and a wireless communication method, and more particularly to an antenna mounted on a portable wireless communication device and a wireless communication method using the antenna.

  An antenna mounted on a portable wireless communication device has been proposed (see, for example, Patent Documents 1 to 3).

  The antenna of Patent Document 1 includes a ground electrode, a chip antenna element, and a high-frequency circuit, and operates as follows. A chip antenna element and a high-frequency circuit are installed on the ground electrode. A slit is provided in the ground electrode between the chip antenna element and the high-frequency circuit. This prevents the current flowing in the thickness direction of the chip antenna element from being weakened by the current flowing through the ground electrode on the high frequency circuit side.

  The antenna of Patent Document 2 includes a monopole antenna element, an inverted F antenna element, and a ground plate, and operates as follows. Inverted F antenna elements are arranged at the corners of the square ground plane. The monopole antenna element is connected to the ground plate via the inverted F antenna element, and is disposed along the outer edge of the square ground plate. This eliminates the need for a matching circuit.

  The antenna of Patent Document 3 includes a monopole antenna element and a ground plate, and operates as follows. The monopole antenna element is connected to a corner of a square ground plate and extends in the longitudinal direction of the ground plate and away from the ground plate. In the longitudinal direction of the ground plate, a slit that is significantly longer than the distance from the connection position with the monopole antenna element is provided. Thereby, SAR (Specific Absorption Rate) is reduced.

JP 2001-274719 A JP 2002-217625 A JP 2005-184073 A

  There is a tendency to reduce the size of mobile radio terminals and multiband radio frequency bands, and it is difficult to maintain both the antenna area and the antenna performance.

  Since the antenna of Patent Document 1 described above uses a chip antenna element, there is a problem that it is difficult to reduce the thickness of the antenna.

  In the antenna of Patent Document 2 described above, since the monopole antenna element is arranged along the outer edge of the ground plate, the ground plate and the monopole antenna are separated by a distance at which coupling occurs between the ground plate and the monopole antenna element. A reverse current flows through the element. For this reason, there is a problem that sufficient radiation characteristics cannot be obtained.

  In the antenna of Patent Document 3 described above, since the monopole antenna element extends in a direction away from the ground plate, the length of the wireless communication device is such that the ground plate and the monopole antenna element can be arranged linearly at least. Become. For this reason, there is a problem that it is difficult to reduce the size of the wireless communication device.

  Therefore, an object of the present invention is to provide an antenna, a wireless communication device, and a wireless communication method that can improve radiation characteristics as well as downsize and thin the wireless communication device.

  The antenna of the present invention is a substantially rectangular shape having a long side having a length equal to or longer than a quarter wavelength of a use frequency and a short side having a length less than a quarter wavelength of the use frequency. A ground plate provided with a notch on one of the long sides at a distance shorter than the length of the short side from the corner of the corner, and connected to a specific corner of the rectangle of the ground plate, the notch And a radiating element disposed along the long side of the ground plate.

  The wireless communication device of the present invention includes the antenna of the present invention.

  The antenna manufacturing method of the present invention is a substantially rectangular shape having a long side having a length equal to or longer than a quarter wavelength of a use frequency and a short side having a length less than a quarter wavelength of the use frequency. A ground plate provided with a notch on one of the long sides at a distance shorter than the length of the short side from the specific corner, and connected to a specific corner of the rectangle of the ground plate, An antenna forming procedure for forming a radiating element disposed along a long side of the ground plate provided with the notch;

  The wireless communication device manufacturing method according to the present invention is a substantially rectangular shape having a long side having a length equal to or longer than a quarter wavelength of a use frequency and a short side having a length less than a quarter wavelength of the use frequency, Forming a ground plate provided with a notch on one of the long sides at a distance shorter than the length of the short side from the specific corner of the rectangle; and the specific corner of the rectangle of the ground plate An antenna forming procedure for forming a radiating element disposed along a long side of the ground plate provided with the notch, and the ground plate and the radiating element formed by the antenna forming procedure. And an antenna mounting procedure to be mounted on the wireless communication device.

  According to the present invention, it is possible to provide an antenna, a wireless communication device, and a wireless communication method capable of improving radiation characteristics as well as making the wireless communication device smaller and thinner.

1 illustrates an example of a wireless communication apparatus according to a first embodiment. 2 shows an example of a method for manufacturing a wireless communication apparatus according to the first embodiment. 4 shows an example of a wireless communication apparatus according to a second embodiment. An example of the direction of current when the notch 8 is not provided on the ground plate 2 is shown. 4 shows another embodiment of a wireless communication apparatus according to the second embodiment. It is a characteristic of the radiation efficiency of the antenna which concerns on an Example and a comparative example. It is an input characteristic of the antenna which concerns on an Example and a comparative example.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 1 shows an example of a wireless communication apparatus according to the first embodiment. The wireless communication apparatus 100 according to the first embodiment includes an antenna 91. The antenna 91 includes the ground plate 2 and the radiating element 3.

  The outer shape of the ground plate 2 is substantially rectangular. In this embodiment, as an example, long sides are arranged in the horizontal direction, and short sides are arranged in the vertical direction. The horizontal length 7b of the ground plate 2 has a length of a quarter wavelength or more of the use frequency. The length 7a in the vertical direction of the ground plate 2 has a length of less than a quarter wavelength of the use frequency. The radiating element 3 is connected to a specific rectangular corner 2a of the ground plate 2 and is disposed along the long side of the ground plate 2 where the notch 8 is provided. Thereby, since the antenna 91 becomes a monopole antenna, the wireless communication apparatus can be reduced in size and thickness.

  Here, the shape of the ground plate 2 only needs to function as a ground, and is not necessarily rectangular. For this reason, the shape of the ground plate 2 was made into a substantially rectangular shape. The ground plate 2 may also be used as a substrate. Depending on the convenience of the substrate, unevenness may be provided on a part of the outer edge, or opposing sides may not be parallel. Even in these cases, the present invention can be applied.

  The ground plate 2 is provided with a notch 8 on one of the long sides at a distance shorter than the length 7a from a specific corner 2a of the rectangle. Thereby, the current in the direction opposite to the current 6a of the radiating element 3 generated in the ground plate 2 can be reduced. Therefore, the antenna 91 can improve the radiation characteristics as the wireless communication device 100 is reduced in size and thickness.

  As described above, the wireless communication device 100 includes the ground plate 2 that is configured so that the vertical and horizontal lengths of the planar size are equal to or less than a quarter wavelength and a quarter wavelength or more of the use frequency band. The radiating element 3 is configured along a side having a quarter wavelength or more. Further, a notch 8 is provided on the ground plate 2 on the side along which the radiating element 3 extends.

  FIG. 2 shows an example of a method for manufacturing the wireless communication apparatus according to the first embodiment. The method for manufacturing a wireless communication apparatus according to the first embodiment includes an antenna formation procedure S101 and an antenna mounting procedure S102 in order.

  In the antenna formation procedure S101, the antenna manufacturing method according to the first embodiment is executed. In the antenna formation procedure S101, the rectangular shape has a long side having a length equal to or longer than a quarter wavelength of the use frequency and a short side having a length less than a quarter wavelength of the use frequency, and from a specific corner of the rectangle. The ground plate 2 is formed with a notch on one of the long sides at a distance shorter than the length of the short side, and is connected to a specific rectangular corner 2a of the ground plate 2 so that the notch 8 is The radiating element 3 is formed along the long side of the ground plate 2 provided. In the antenna mounting procedure S102, the ground plate 2 and the radiating element 3 formed in the antenna formation procedure S101 are mounted on the wireless communication device 100.

  The antenna 91 can be manufactured by executing the antenna formation procedure S101. The antenna 91 can improve the radiation characteristics as the wireless communication device 100 is reduced in size and thickness. Therefore, the antenna manufacturing method according to the first embodiment can improve the radiation characteristics as well as reducing the size and thickness of the wireless communication device 100.

As described above, the present invention has the following effects.
The first effect is that the notch 8 is provided in the ground plate 2 in the housing of the wireless communication device 100, so that the external size of the housing of the wireless communication device 100 is not increased.
Since the second effect has an effect of changing the ground condition of the antenna 91 in the use frequency band, the degree of freedom of antenna arrangement in the housing of the wireless communication device 100 is increased.
Since the third effect has an effect of changing the ground condition of the antenna of the use frequency band, when configuring the multiband antenna of the wireless communication apparatus 100, the antenna 91 can be configured in one place.

  An angle 2b formed by the long side of the ground plate 2 provided with the notch 8 shown in FIG. 1 and a straight line connecting a specific corner 2a of the rectangle of the ground plate 2 and the tip of the notch 8 is 45. It may be more than °. As a result, the current 6 b can flow along the short side of the ground plate 2. In order to prevent a current in the direction opposite to the current 6 a of the radiating element 3 from being generated in the ground plate 2, the radiation characteristics of the antenna 91 can be further improved.

  In this case, in the antenna formation procedure S101 shown in FIG. 2, a straight line connecting the long side of the ground plate 2 provided with the notch 8 and the specific corner 2a of the rectangle of the ground plate 2 and the tip of the notch 8. And a notch is provided so that the angle 2b formed is 45 ° or more.

  The antenna 91 is, for example, a mopole antenna. In this case, the number of the radiating elements 3 is one, and has a length of approximately a quarter wavelength of the use frequency. In this case, in the antenna formation procedure S101 shown in FIG. 2, one radiating element having a length of about a quarter wavelength of the use frequency is connected.

  Further, the radiating element 3 may be an inverted L-shaped antenna element. In this case, the following procedure is executed in the antenna manufacturing method shown in FIG. In antenna formation procedure S101, an inverted L-shaped antenna element is connected as a radiating element.

  The radiating element 3 may be an inverted F antenna element. In this case, in the antenna formation procedure S101 shown in FIG. 2, an inverted F antenna element is connected as a radiating element.

(Embodiment 2)
FIG. 3 shows an example of a wireless communication apparatus according to the second embodiment. A radiating element 3 and a ground plate 2 used for wireless communication are configured in a housing 1 of the wireless communication device. On the ground plate 2, a feeding point 4 of the radiating element 3 and a wireless circuit 5 are mounted. In terms of circuit, the radiating element 3 and the wireless circuit 5 are electrically connected to each other so that RF signals can be exchanged. Here, the vertical length on the plane of the ground plate 2 is set to be less than a quarter wavelength of the antenna use frequency band, and the horizontal length is set to a quarter wavelength or more. The ground plate 2 is provided with a notch 8 so that the lateral distance 7c from the feeding point 4 of the antenna to the notch 8 is shorter than the longitudinal length 7a of the ground plate 2, and the depth portion of the notch 8 is further formed. The line connecting the feeding points 4 is 45 ° or more as shown by an angle 7d with respect to the horizontal direction of the ground plate 2. Further, the antenna 91 is a monopole type, and the radiating element 3 is disposed along the horizontal direction of the ground plate 2. The ground plate 2 may be a substrate.

  The operation will be described below with reference to FIGS. Consider the direction of current on the radiating element 3 and the ground plate 2 in the housing 1 in the use frequency band.

  FIG. 4 shows an example of the direction of current when the notch 8 is not provided on the ground plate 2. When the notch 8 is not provided on the ground plate 2, the current on the ground plate 2 mainly flows in the direction of the horizontal direction 6b of the ground plate 2 having a length of ¼ wavelength or more. At this time, the direction 6a of the current flowing through the radiating element 3 cancels out, so that sufficient antenna radiation characteristics may not be obtained.

  In the wireless communication apparatus according to the second embodiment shown in FIG. 3, a slit 81 is provided on the ground plate 2 as the notch 8. In this case, the current 6b on the ground plate 2 is shorter than a quarter wavelength when the lateral distance between the antenna feed point 4 and the slit 81 and the vertical length of the ground plate 2 are compared. However, since the longitudinal direction of the ground plate 2 is longer, the current can flow mainly in the direction orthogonal to the current 6a flowing through the radiating element. In this way, it is possible to obtain a sufficient radiation characteristic by providing the monopole type antenna with the slit 81 irrespective of the size of the substrate and the antenna arrangement.

  In the wireless communication apparatus according to the second embodiment, the direction of the current flowing through the ground plate 2 is limited by providing the slit 81 on the substrate or the ground plate on which the antenna in the housing 1 is mounted. By providing the slit 81, the current flowing through the ground plate 2 facing the radiating element 3 can be reduced, and the current can flow through the ground plate 2 in a direction orthogonal to the direction of the current flowing through the radiating element 3. As a result, it is possible to obtain the radiation characteristics of a monopole antenna that effectively uses the casing as the ground plate 2. In addition, this configuration has a feature that the degree of freedom of antenna mounting arrangement in the housing is increased.

  In the wireless communication apparatus according to the second embodiment, the circuit 9 may be inserted at a position that bridges the slit 81. FIG. 5 shows another form of the wireless communication apparatus according to the second embodiment. By inserting the circuit 9 at a position that bridges the slit 81, the appearance of the high-frequency slit 81 can be changed depending on the frequency. Further, if the radiating element shape is a monopole type, it can be considered that the same operation is performed. Therefore, an inverted L shape and an inverted F shape can be considered.

FIG. 6 and FIG. 7 show the calculation results when an 800 MHz band antenna is configured.
FIG. 6 shows the characteristics of the radiation efficiency of the antennas according to the example and the comparative example. It can be confirmed that the radiation efficiency of the antenna of the example is more advantageous than the radiation efficiency of the antenna of the comparative example.

  FIG. 7 shows input characteristics of the antennas according to the example and the comparative example. It can be confirmed that the input characteristics of the antenna of the comparative example and the input characteristics of the antenna of the example are set to be approximately the same.

  The present invention can be applied to the information communication industry.

  (Additional remark 1) It is a rectangle which has a long side with the length of 1/4 wavelength or more of use frequency, and a short side with the length of less than 1/4 wavelength of the use frequency, from the specific corner of the rectangle A ground plate provided with a notch on one of the long sides at a distance shorter than the length of the short side, and connected to a specific corner of the rectangle of the ground plate, and the notch is provided. An antenna manufacturing method comprising an antenna forming procedure for forming a radiating element disposed along a long side of the ground plate.

  (Supplementary note 2) In the antenna formation procedure, a long side of the ground plate provided with the notch, and a straight line connecting a specific corner of the rectangle and the tip of the notch of the ground plate, The antenna manufacturing method according to appendix 1, wherein the notch is provided so that an angle formed is 45 ° or more.

  (Additional remark 3) In the said antenna formation procedure, the said radiation element which has the length of about 1/4 wavelength of the said utilization frequency is connected, The antenna manufacturing method of Additional remark 1 or 2 characterized by the above-mentioned.

  (Additional remark 4) In the said antenna formation procedure, an inverted L-shaped antenna element is connected as said radiation element, The antenna manufacturing method of Additional remark 2 characterized by the above-mentioned.

  (Additional remark 5) The antenna manufacturing method of Additional remark 2 characterized by connecting an inverted F type antenna element as said radiation element in the said antenna formation procedure.

(Additional remark 6) It is a rectangle which has a long side with the length of 1/4 wavelength or more of a use frequency, and a short side with a length of less than a quarter wavelength of the use frequency, from the specific corner of the rectangle Forming a ground plate provided with a notch on one of the long sides at a distance shorter than the length of the short side, connected to a specific corner of the rectangle of the ground plate, and the notch An antenna forming procedure for forming a radiating element disposed along the long side of the ground plate provided with:
An antenna mounting procedure for mounting the ground plate and the radiating element formed in the antenna forming procedure on a wireless communication device;
A method of manufacturing a wireless communication device having the following.

  (Supplementary note 7) In the antenna formation procedure, a long side of the ground plate provided with the notch, and a straight line connecting a specific corner of the rectangle and the tip of the notch of the ground plate, The wireless communication device manufacturing method according to appendix 6, wherein the notch is provided so that an angle formed is 45 ° or more.

  (Supplementary note 8) The wireless communication device manufacturing method according to supplementary note 6 or 7, wherein, in the antenna formation procedure, one radiating element having a length of approximately a quarter wavelength of the utilization frequency is connected. .

  (Supplementary note 9) The wireless communication device manufacturing method according to supplementary note 8, wherein an inverted L-shaped antenna element is connected as the radiating element in the antenna formation procedure.

  (Supplementary note 10) The wireless communication device manufacturing method according to supplementary note 8, wherein an inverted F-shaped antenna element is connected as the radiating element in the antenna formation procedure.

1: Housing 2: Ground plate 2a: Specific angle 2b: Angle 3: Radiating elements 6a, 6b: Current 7a: Vertical length 7b of ground plate 2: Horizontal length 7c of ground plate 2: Power feeding Horizontal distance 7d from point 4 to notch 8: angle 8: notch 9: circuit 81: slit 91: antenna 100: wireless communication device

Claims (10)

It is a substantially rectangular shape having a long side having a length equal to or longer than a quarter wavelength of the use frequency and a short side having a length less than a quarter wavelength of the use frequency, and the short side from a specific corner of the rectangle A ground plate provided with a cutout on one of the long sides at a distance shorter than the length of
A radiating element connected to a specific corner of the rectangle of the ground plate and disposed along a long side of the ground plate provided with the notch,
With antenna.   An angle formed by a long side of the ground plate provided with the notch and a straight line connecting a specific corner of the rectangle and the tip of the notch of the ground plate is 45 ° or more. The antenna according to claim 1.   3. The antenna according to claim 1, wherein the number of the radiating elements is one and has a length of approximately a quarter wavelength of the use frequency. 4.   The antenna according to claim 3, wherein the radiating element is an inverted L-shaped antenna element.   The antenna according to claim 3, wherein the radiating element is an inverted F-shaped antenna element.   A wireless communication apparatus comprising the antenna according to claim 1.   A rectangular shape having a long side having a length equal to or longer than a quarter wavelength of the use frequency and a short side having a length less than a quarter wavelength of the use frequency, and the short side from a specific corner of the rectangle. A ground plate provided with a notch on one of the long sides at a distance shorter than the length, and the ground connected to a specific corner of the rectangle of the ground plate and provided with the notch An antenna manufacturing method including an antenna forming procedure for forming a radiating element disposed along a long side of a plate.   In the antenna formation procedure, an angle formed by a long side of the ground plate provided with the cutout and a straight line connecting a specific corner of the rectangle and a tip of the cutout of the ground plate is 45. The antenna manufacturing method according to claim 7, wherein the notch is provided so as to be equal to or more than °.   9. The antenna manufacturing method according to claim 7 or 8, wherein, in the antenna formation procedure, one of the radiating elements having a length of approximately a quarter wavelength of the use frequency is connected. A rectangular shape having a long side having a length equal to or longer than a quarter wavelength of the use frequency and a short side having a length less than a quarter wavelength of the use frequency, and the short side from a specific corner of the rectangle. Forming a ground plate provided with a notch on one of the long sides at a distance shorter than the length, connected to a specific corner of the rectangle of the ground plate, and provided with the notch An antenna forming procedure for forming a radiating element disposed along a long side of the ground plate;
An antenna mounting procedure for mounting the ground plate and the radiating element formed in the antenna forming procedure on a wireless communication device;
A method of manufacturing a wireless communication device having the following.

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