JP2009088839A - Radio communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication device of a PC card type which uses a built-in antenna, and can increase the intensity of vertically polarized component of radiated electric waves more than before. <P>SOLUTION: The radio communication device of the PC card type is inserted in an extension slot of an electronic device, and comprises a mounting board which is rectangular, with a ground pattern formed on one entire surface, with a connection terminal provided to one side, and an inverted F antenna of rectangular solid shape which is mounted on the ground pattern, with a feeder electrode provided on the surface. The inverted F antenna is positioned in the middle of the short side of the mounting board, being closer to other short side than the center of a long side, and the feeder electrode is positioned on the side of long side of the mounting board, with its own long side being parallel to the long side of the mounting board. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus.

As a wireless communication apparatus, a PC card that incorporates an antenna in a housing and is used by being mounted in an expansion slot of a personal computer or the like has been put into practical use. This type of PC card with a built-in antenna was developed as a low-priced version of a PC card with a movable external antenna. By using a relatively inexpensive internal antenna instead of an expensive external antenna, the cost can be reduced. I am trying.
Patent Document 1 listed below discloses an antenna device in which a ground plate is disposed in a state of being overlapped with an antenna unit at a lower side of the antenna unit as a technique related to such a PC card. In the antenna device of Patent Document 1 below, an electric image of the antenna unit is generated at a symmetrical position on the opposite side of the antenna unit with respect to the ground plate. Thereby, this antenna apparatus will be in a state equivalent to the state in which the vertical monopole antenna is provided.
Similarly, in Patent Document 2, as a technique related to a PC card, the distance between the radiation electrode and the ground conductor layer is shortened by forming the radiation electrode in a special shape, and between the radiation electrode and the ground conductor layer. Since the operating frequency can be lowered by generating a large capacitance component, a technique is disclosed that can operate as a small antenna device without increasing the dielectric or the like constituting the surface mount antenna.
JP 2002-33620 A JP 2004-180167 A

By the way, the PC card type wireless communication apparatus using the built-in antenna has a lower intensity of the vertically polarized wave component of the radiated radio wave than that provided with a movable external antenna. Since the PC card type wireless communication device mainly transmits and receives vertically polarized radio waves, it is necessary to increase the intensity of the vertical polarization component. However, in the PC card type wireless communication device using the built-in antenna, The price is reduced at the expense of the intensity of the vertical polarization component to some extent.
However, in order to achieve stable wireless quality as a PC card type wireless communication device, it is necessary to increase the intensity of the vertically polarized component while using the built-in antenna.

  The present invention has been made in view of the above-described circumstances, and is a PC card type wireless communication apparatus using a built-in antenna, in which the intensity of the vertically polarized component of the radiated radio wave can be made higher than before. An object is to provide an apparatus.

  In order to achieve the above object, a PC card type wireless communication device inserted into an expansion slot of an electronic device, having a rectangular shape, having a ground pattern formed on the entire surface of one side, A mounting board provided with a connection terminal on a side; and a rectangular parallelepiped inverted F antenna mounted on the ground pattern and provided with a feeding electrode on the surface. The inverted F antenna is a short of the mounting board. Located from the center of the side and from the center of the long side to the other short side, the feed electrode is positioned on the long side of the mounting board, and its long side is arranged parallel to the long side of the mounting board Adopt the means.

  In the present invention, as a second solving means related to the wireless communication device, the wireless communication device is a PC card type wireless communication device inserted into an expansion slot of an electronic device, and has a rectangular shape and a ground pattern is entirely on one surface. And a rectangular parallelepiped inverted F antenna mounted on the ground pattern and provided with a feeding electrode on the surface thereof, and the reverse The F antenna is positioned from the center of the short side of the rectangular mounting board to the other long side and from the center of the long side to the short side opposite to the connection terminal, and the feeding electrode is positioned on the connection terminal side. At the same time, a means is adopted in which the long side thereof is arranged in parallel with the short side of the mounting substrate.

In the present invention, as the third solving means relating to the wireless communication apparatus, in the first solving means, the inverted F antenna is located 2 mm to 30 mm away from the short side of the mounting board opposite to the connection terminal. Adopt the means to do.

In the present invention, as a fourth solving means related to the wireless communication apparatus, in the second solving means, the inverted F antenna is separated from the short side of the mounting substrate opposite to the connection terminal by 2 mm to 20 mm and the The power supply electrode is provided along the right side of the side surface of the inverted F antenna on the connection terminal side, which is located within a range of 0 mm to 10 mm from the long side on the left side of the mounting substrate when viewed from the connection terminal side. Adopt the means.

In the present invention, as a fifth solving means relating to the wireless communication device, in the second solving means, the inverted F antenna is separated from the short side of the mounting substrate opposite to the connection terminal by 2 mm to 20 mm and the The power supply electrode is provided along the left side of the side surface of the inverted F antenna on the connection terminal side, which is located within a range of 0 mm to 10 mm from the long side on the right side of the mounting substrate when viewed from the connection terminal side. Adopt the means.

  According to the present invention, the wireless communication device has a rectangular shape, the ground pattern is formed on the entire surface, and the connection terminal is provided on one short side, and the ground pattern on the mounting board And a rectangular parallelepiped inverted F antenna having a feeding electrode provided on the surface, the inverted F antenna being located from the center of the short side of the mounting substrate and from the center of the long side to the other short side. Since the feeding electrode is located on the long side of the mounting board and the long side of the feeding electrode is parallel to the long side of the mounting board, the intensity of the vertically polarized component of the radiated radio wave is made higher than before. be able to.

Further, according to the present invention, the wireless communication device occupies the ground pattern over the entire surface layer and has a rectangular substrate with a short side as a connection terminal;
A mounting substrate having a rectangular shape and having a ground pattern formed on the entire surface of one surface and a connection terminal provided on one short side, and mounted on the ground pattern and provided with a feeding electrode on the surface A rectangular parallelepiped-shaped inverted F antenna, the inverted F antenna extending from the center of the short side of the rectangular mounting board to the other long side and from the center of the long side to the short side opposite to the connection terminal. And the power supply electrode is positioned on the connection terminal side and the long side of the power supply electrode is arranged in parallel with the short side of the mounting substrate. can do.

  Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to an antenna built-in PC (Personal Computer) card that complies with the standard of PCMCIA (Personal Computer Memory Card International Association) and incorporates an antenna in a housing. Note that the PC card with a built-in antenna in this embodiment is a wireless communication apparatus in the present invention.

[First Embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a perspective view showing a schematic internal configuration of the PC card A with a built-in antenna according to the first embodiment with the housing removed. As shown in the figure, this antenna built-in PC card A is inserted into a PC card slot 10 (expansion slot) of a notebook personal computer P (electronic device), and performs wireless communication with external devices using vertically polarized radio waves. .

The antenna built-in PC card A includes a mounting substrate 1, an inverted F antenna 2, and a casing (not shown) as an exterior component.
The mounting board 1 is a rectangular four-layer board having a length of 125 mm and a width of 48 mm. A ground pattern, a signal pattern (two layers), and a power supply pattern are formed in order from the surface layer, and connected to one short side. A terminal 1e is provided.
In the following description, in the mounting substrate 1, the short side (the other short side) opposite to the connection terminal 1e is the mounting substrate upper side 1a, and the short side provided with the connection terminal is the mounting substrate lower side 1b. The right side toward the mounting board lower side 1b is called the mounting board right side 1c, and the side opposite to the mounting board right side 1c is called the mounting board left side 1d.
FIG. 2 is a diagram showing the ground pattern. As shown in FIG. 2, the ground pattern is formed on the entire surface of the mounting substrate 1, and the inverted F antenna 2 is mounted on the ground pattern.

  The inverted F antenna 2 is an antenna for transmitting / receiving signals to / from an external base station (not shown) by wireless communication, and is composed of a rectangular parallelepiped dielectric 2a having a length of 17 mm × a width of 5 mm × a height of 6 mm. The side of the upper side surface of 2a having a length of 17 mm is arranged so as to be parallel to the right side 1c of the mounting substrate. In the inverted F antenna 2, a feeding electrode 2b made of copper foil or the like is provided so as to face the left side 1d of the mounting substrate, and a radiation electrode 2c is provided on the dielectric 2a. The dielectric constant of the dielectric 2a is about 6.7.

The inverted F antenna 2 is mounted at a position 2 mm away from the upper side 1 a of the mounting board, 21.5 mm from the right side 1 c of the mounting board, and 21.5 mm from the left side 1 d of the mounting board on the ground pattern of the mounting board 1.
FIG. 3 is a radiation characteristic diagram showing a simulation result of the radiation characteristics of horizontal polarization and vertical polarization of the PC card A with built-in antenna having the above configuration. Note that the frequency used in the simulation is approximately 1.9 GHz. The direction 0 degree shown in the radiation characteristic diagram based on the simulation is the direction of the right side 1c of the mounting board, the direction 90 degrees is the direction of the upper side 1a of the mounting board, and the direction -90 degrees is the direction of the lower side 1b of the mounting board. The direction −180 degrees is the direction of the left side 1d of the mounting board.

  The characteristics of the radiation characteristic diagram of FIG. 3 will be described in comparison with the simulation results of the radiation characteristics of the horizontal polarization and the vertical polarization of the conventional PC card N with a built-in antenna. The configuration of the antenna built-in PC card N will be described with reference to a perspective view showing an internal schematic configuration with the housing of the antenna built-in PC card N removed.

  The antenna built-in PC card N is provided with a mounting substrate 3 and an antenna 4. The mounting board 3 is a rectangular four-layer board having a length of 125 mm and a width of 48 mm, like the mounting board 1. Similarly to the mounting substrate 1, in the mounting substrate 3, the short side opposite to the connection terminal 3e is the mounting substrate upper side 3a, and the short side provided with the connection terminal side is the mounting substrate lower side 3b and the mounting substrate lower side 3b. The right side is called the mounting board right side 3c, and the side opposite to the mounting board right side 3c is called the mounting board left side 3d. FIG. 5 is a diagram showing a ground pattern of the mounting substrate 3 of the PC card N with a built-in antenna. As shown in FIG. 5, the printed circuit board is exposed on the mounting board 3 around the upper side 3 a of the mounting board on which the antenna 4 is mounted, and a groundon pattern is formed on the other part of the mounting board 3. .

  The antenna 4 is a monopole antenna configured by a dielectric 4a having a length of 4 mm, a width of 10 mm, and a height of 6 mm for transmitting and receiving signals to and from an external base station (not shown) by wireless communication. The antenna 4 is disposed in a direction in which a side having a width of 10 mm is parallel to the upper side 3a of the mounting board, and at a position 19 mm away from the right side 1c of the mounting board and 19 mm away from the left side 1d of the mounting board so as to contact the upper side 3a of the mounting board Has been implemented. FIG. 6 is a radiation characteristic diagram showing a simulation result of horizontal polarization and vertical polarization radiation characteristics of the PC card N with an antenna having the above-described configuration. In addition, the direction 0 degree shown in the radiation characteristic diagram based on the simulation is the direction of the mounting board right side 3c, the direction 90 degrees is the direction of the mounting board upper side 3a, and the direction -90 degrees is the direction of the mounting board lower side 3b. The direction −180 degrees is the direction of the left side 3d of the mounting board.

As compared with the radiation characteristic of the PC card N with an antenna shown in FIG. 6, the radiation characteristic of the PC card A with an antenna shown in FIG. 3 clearly increases the vertical polarization component and decreases the horizontal polarization component. The vertical polarization intensity of the PC card A with built-in antenna is −1.3 dBi, and the vertical polarization intensity of the PC card N with built-in antenna is −12 dBi.
The polarization intensity indicates an average value in each direction based on the simulation result. The outer periphery of the radiation characteristic diagram is 4 dBi.

  According to the first embodiment, the inverted F antenna 2 is arranged on the ground pattern of the mounting substrate 1 so that the side of the upper surface of the dielectric 2a having a length of 17 mm is parallel to the mounting substrate right side 1c. 2b is arranged so as to face the mounting substrate left side 1d side, and is mounted at a position 2mm away from the upper side 1a of the mounting substrate, 21.5mm from the right side 1c of the mounting substrate, and 21.5mm from the left side 1d of the mounting substrate. By optimizing the position and posture of the inverted F antenna 2 with respect to the substrate 1 so that the intensity of the vertically polarized component is increased, the intensity of the vertically polarized component can be made higher than that of the conventional PC card N with a built-in antenna. it can.

[Second Embodiment]
Next, a second embodiment will be described.
FIG. 7 is a perspective view showing a schematic internal configuration of the PC card B with a built-in antenna according to the second embodiment with the housing removed. This antenna built-in PC card B is different in the position of the inverted F antenna 2 on the mounting substrate from the antenna built-in PC card A of the first embodiment. Therefore, in this antenna built-in PC card B, the same functional components as in the antenna built-in PC card A of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The inverted F antenna 2 is mounted at a position 30 mm away from the upper side 1 a of the mounting board, 21.5 mm from the right side 1 c of the mounting board, and 21.5 mm from the left side 1 d of the mounting board on the ground pattern of the mounting board 1.

FIG. 8 is a radiation characteristic diagram showing a simulation result of the radiation characteristics of the horizontal polarization and the vertical polarization of the antenna built-in PC card B having the above configuration.
As compared with the radiation characteristic of the PC card N with an antenna shown in FIG. 6, the radiation characteristic of the PC card B with an antenna shown in FIG. 8 clearly increases in the vertical polarization component and decreases in the horizontal polarization component. The vertical polarization intensity of the PC card B with a built-in antenna is −1.7 dBi.

  According to the second embodiment, the inverted F antenna 2 is arranged on the ground pattern of the mounting substrate 1 such that the side of the upper surface of the dielectric 2a having a length of 17 mm is parallel to the right side 1c of the mounting substrate. 2b is arranged so as to face the mounting substrate left side 1d side, and is mounted at a position 30 mm away from the upper side 1a of the mounting substrate, 21.5 mm away from the right side 1c of the mounting substrate, and 21.5 mm away from the left side 1d of the mounting substrate. By optimizing the position and posture of the inverted F antenna 2 with respect to the substrate 1 so that the intensity of the vertically polarized component is increased, the intensity of the vertically polarized component can be made higher than that of the conventional PC card N with a built-in antenna. it can.

[Third Embodiment]
Next, a third embodiment will be described.
FIG. 9 is a perspective view showing the internal schematic configuration of the PC card C with a built-in antenna according to the third embodiment with the housing removed. This antenna built-in PC card C differs from the antenna built-in PC card A of the first embodiment in the direction of the inverted F antenna 2 and the position on the mounting board. Therefore, in this PC card C with a built-in antenna, the same functional components as those of the PC card A with a built-in antenna of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

This antenna built-in PC card C is provided with a mounting substrate 1 and an inverted F antenna 2.
The inverted F antenna 2 is disposed so that the side of the upper surface of the dielectric 2a having a length of 17 mm is parallel to the lower side 1b of the mounting substrate and the feeding electrode 2b faces the lower side of the mounting substrate. The power supply electrode 2b is located 15.5 mm away from the left side 1d of the mounting substrate.
Further, the inverted F antenna 2 is mounted with a distance of 20 mm from the upper side 1a of the mounting board on the ground pattern of the mounting board 1 and 0 mm to 10 mm from the left side 1d of the mounting board.

FIG. 10 is a radiation characteristic diagram showing a simulation result of the radiation characteristics of the horizontal polarization and the vertical polarization of the PC card C with the built-in antenna having the above configuration.
As compared with the radiation characteristic of the PC card N with an antenna shown in FIG. 6, the radiation characteristic of the PC card with an antenna shown in FIG. 10 is clearly increased in the vertical polarization component and reduced in the horizontal polarization component. Note that the vertical polarization intensity of the PC card with a built-in antenna is −0.5 dBi.

  According to the third embodiment, on the ground pattern of the mounting substrate 1, the inverted F antenna 2 has a side with a length of 17 mm on the upper side surface of the dielectric 2 a that is parallel to the lower side 1 b of the mounting substrate and a power supply electrode. 2b is disposed so as to face the lower side of the mounting board, and is mounted in the range of 20 mm from the upper side 1a of the mounting board and 0 mm to 10 mm from the left side 1d of the mounting board, that is, the position of the inverted F antenna 2 with respect to the mounting board 1 And the attitude are optimized so that the intensity of the vertically polarized component is increased, the intensity of the vertically polarized component can be made higher than that of the conventional PC card N with a built-in antenna.

[Fourth Embodiment]
Next, a third embodiment will be described.
FIG. 11 is a perspective view showing a schematic internal configuration of the antenna built-in PC card D according to the fourth embodiment with the housing removed. The antenna-incorporated PC card D is different from the antenna-internal PC card C of the third embodiment in the positions of the feeding electrodes of the inverted F antenna 2 and the positions on the mounting substrate. Therefore, in this PC card D with a built-in antenna, the same functional components as those of the PC card D with a built-in antenna of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

The antenna built-in PC card D, the mounting substrate 1 and the inverted F antenna 2 are provided.
The inverted F antenna 2 is disposed so that the side of the upper surface of the dielectric 2a having a length of 17 mm is parallel to the lower side 1b of the mounting substrate and the feeding electrode 2b faces the lower side of the mounting substrate. The feeding electrode 2b of the inverted F antenna 2 is provided along the left side of the side surface of the dielectric 2a on the mounting substrate lower side 1b, unlike the antenna built-in PC card C of the third embodiment. The power supply electrode 2b is located 15.5 mm away from the mounting substrate right side 1c.
Further, the inverted F antenna 2 is mounted at a position separated from the mounting substrate upper side 1a on the ground pattern of the mounting substrate 1 by 20 mm and from the mounting substrate left side 1d by 0 mm to 10 mm.

FIG. 12 is a radiation characteristic diagram showing a simulation result of the radiation characteristics of the horizontal polarization and the vertical polarization of the antenna built-in PC card D configured as described above.
Compared with the radiation characteristic of the PC card N with an antenna shown in FIG. 6, the radiation characteristic of the PC card D with an antenna shown in FIG. The vertical polarization intensity of the PC card D with the built-in antenna is −0.9 dBi.

  According to such a fourth embodiment, on the ground pattern of the mounting substrate 1, the inverted F antenna 2 has a side with a length of 17 mm on the upper side surface of the dielectric 2 a that is parallel to the lower side 1 b of the mounting substrate and a feeding electrode. 2b is arranged so as to face the lower side of the mounting substrate, the feeding electrode 2b of the inverted F antenna 2 is provided along the left side of the side surface of the dielectric 2a on the lower side of the mounting substrate 1b, and the inverted F antenna 2 is connected to the upper side 1a of the mounting substrate. To 20 mm from the mounting board left side 1d and a position separated from 0 mm to 10 mm from the left side 1d, that is, the position and orientation of the inverted F antenna 2 with respect to the mounting board 1 are set so that the intensity of the vertically polarized component increases. By optimizing, the strength of the vertically polarized component can be made higher than that of the conventional PC card N with a built-in antenna.

It is a perspective view which shows the internal schematic structure which removed the housing | casing of the antenna built-in PC card A which concerns on 1st Embodiment of this invention. It is a figure which shows the ground pattern of the mounting board | substrate 1 of PC card A with an antenna which concerns on 1st Embodiment of this invention. It is a radiation characteristic figure which shows the simulation result of the radiation characteristic of horizontal polarization and vertical polarization of antenna built-in PC card A concerning a 1st embodiment of the present invention. It is a perspective view which shows the internal schematic structure which removed the housing | casing of the conventional PC card N with a built-in antenna. It is a figure which shows the ground pattern of the mounting substrate 3 of the conventional PC card N with a built-in antenna. It is a radiation characteristic figure which shows the simulation result of the radiation characteristic of the horizontal polarization | polarized-light and vertical polarization of the conventional PC card N with a built-in antenna. It is a perspective view which shows the internal schematic structure which removed the housing | casing of the antenna built-in PC card B which concerns on 2nd Embodiment of this invention. It is a radiation characteristic figure which shows the simulation result of the radiation characteristic of the horizontal polarization and vertical polarization of PC card B with a built-in antenna concerning a 2nd embodiment of the present invention. It is a perspective view which shows the internal schematic structure which removed the housing | casing of the antenna built-in PC card C which concerns on 3rd Embodiment of this invention. It is a radiation characteristic figure which shows the simulation result of the radiation characteristic of the horizontal polarization and vertical polarization of antenna built-in PC card C concerning a 3rd embodiment of the present invention. It is a perspective view which shows the internal schematic structure which removed the housing | casing of the antenna built-in PC card D which concerns on 4th Embodiment of this invention. It is a radiation characteristic figure showing a simulation result of radiation characteristics of horizontal polarization and vertical polarization of antenna built-in PC card D concerning a 4th embodiment of the present invention.

Explanation of symbols

  A, B, C, D, N: antenna built-in PC card, P: notebook personal computer, 1, 3 ... mounting board, 1a, 3a ... mounting board upper side, 1b, 3b ... mounting board lower side, 1c, 3c ... mounting Right side of substrate, 1d, 3d ... left side of mounting substrate, 1e, 3e ... connection terminal, 2 ... reverse F antenna, 2a ... dielectric, 2b ... feed electrode, 2c ... radiation electrode, 4 ... antenna, 4a ... dielectric, 10 ... PC card slot

Claims (5)

A PC card type wireless communication device inserted into an expansion slot of an electronic device,
A mounting board having a rectangular shape, a ground pattern is formed on the entire surface of one surface, and a connection terminal is provided on one short side;
A rectangular parallelepiped inverted-F antenna mounted on the ground pattern and provided with a feeding electrode on the surface;
The inverted F antenna is located at the center of the short side of the mounting substrate and from the center of the long side to the other short side, the feed electrode is positioned on the long side of the mounting substrate, and its long side is the length of the mounting substrate. A wireless communication device, wherein the wireless communication device is arranged in parallel with a side. A PC card type wireless communication device inserted into an expansion slot of an electronic device,
A mounting board having a rectangular shape, a ground pattern is formed on the entire surface of one surface, and a connection terminal is provided on one short side;
A rectangular parallelepiped inverted-F antenna mounted on the ground pattern and provided with a feeding electrode on the surface;
The inverted F antenna is positioned from the center of the short side of the rectangular mounting substrate to the other long side and from the center of the long side to the short side opposite to the connection terminal, and the feeding electrode is on the connection terminal side. A wireless communication device, wherein the wireless communication device is positioned so that its long side is parallel to the short side of the mounting substrate.   The wireless communication apparatus according to claim 1, wherein the inverted F antenna is located 2 mm to 30 mm away from a short side of the mounting substrate opposite to the connection terminal.   The inverted-F antenna is located 2 mm to 20 mm away from the short side of the mounting board opposite to the connection terminal, and is located within a range of 0 mm to 10 mm from the long side on the left side of the mounting board with respect to the connection terminal. The wireless communication apparatus according to claim 2, wherein the feeding electrode is provided along a right side of a side surface of the inverted F antenna on the connection terminal side. The inverted F antenna is separated from the short side of the mounting substrate opposite to the connection terminal by 2 mm to 20 mm and separated from the long side which is the right side of the mounting substrate with respect to the connection terminal side in a range of 0 mm to 10 mm. 3. The wireless communication apparatus according to claim 2, wherein the power supply electrode is provided along a left side of a side surface of the inverted F antenna on the connection terminal side.

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