JP2003051712A - Inverted f antenna and portble communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverted F antenna built in a foldable mobile radio communication apparatus, which can realize a broadband characteristic even when the frequency band of a radio wave in use is comparatively low and a grounding conductor does not contribute to excitation of the antenna. SOLUTION: The inverted F antenna 102 is provided with a grounding conductor 11 and an antenna element 12 arranged on the grounding conductor 11 so as to face the grounding conductor 11. The inverted F antenna 102 further includes at least one coupling element 13 provided between the grounding conductor 11 and the antenna element 12 so as to face the grounding conductor 11 and the antenna element 12, and a short-circuiting conductor 22 is provided for electrically connecting the antenna element 12 with the grounding conductor 11 and a feeder conductor 21 connects the antenna element 12 to a feed point 25 to which a feeder coaxial cable 30 is connected via the coupling element 13. Since the inverted F antenna 102 is provided with the coupling element 13, the antenna 102 can obtain a plurality of resonance frequencies so as to realize more broadband frequency characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverted F type antenna device for a portable wireless communication device mainly for mobile communication such as a mobile phone and a portable wireless communication device equipped with the inverted F type antenna device.

[0002]

2. Description of the Related Art In recent years, mobile communication systems using portable wireless communication devices such as mobile phones have been rapidly developed.
This mobile phone is undergoing a transformation from an existing position as a voice terminal device to an information terminal device for transmitting data and images. Along with this, folding type mobile phones, which are more suitable for larger screens, have become popular.

FIG. 31 (a) is a plan view showing the configuration of a portable radio communication device 1001 which is a straight type portable telephone according to the prior art, and FIG. 31 (b) is shown in FIG. 31 (a).
Dielectric Substrate 10 Comprising the Inverted-F Antenna Device 1005
It is a top view which shows schematic structure of 04.

In FIG. 31 (a), a liquid crystal display unit 1003 is provided near the upper side of the central portion of a casing 1002 of the portable radio communication device 1001, while a dielectric substrate 1004 is provided throughout the inside of the casing 1002. Has been. Here, a built-in antenna 1005 is arranged above the dielectric substrate 1004 in the figure. This built-in antenna 10
As shown in FIG. 31B, reference numeral 05 denotes a rectangular flat plate-shaped antenna element 1006, a cylindrical pin-shaped short-circuit conductor 1007 for connecting the antenna element 1006 to a ground conductor (not shown), and an antenna element. A columnar pin-shaped power supply conductor 1008 connects 1006 to a power supply coaxial cable (not shown) at a power supply point. The built-in antenna 1005 is usually a plate-shaped inverted F antenna (Planar I
nverted FAntenna (PIFA), which is a low profile and small inverted F antenna device. Since this inverted F type antenna device is an unbalanced type antenna, it operates as an antenna when a large current flows through the ground conductor formed on the back surface of the dielectric substrate 1004. In this case, if the dimension obtained by adding the length in the long side direction of the ground conductor and the length in the short side direction is larger than λ / 4 of the wavelength λ of the frequency band of the radio wave used, the standing wave of the current is generated. Therefore, a wide band characteristic can be obtained.

[0005]

However, in the case of the inverted F type antenna device incorporated in the folding type portable radio communication device, the straight type portable radio communication device 1 is used.
The size of the dielectric substrate, that is, the size of the ground conductor becomes shorter than that of the inverted F type antenna device built in 001. In this case, when the frequency band of the used radio wave is relatively low, the dimension of the length of the ground conductor in the long side direction and the length in the short side direction is added to the wavelength λ of the frequency band of the radio wave used.
On the other hand, since it is smaller than λ / 4, there is a problem that the ground conductor does not contribute to the excitation of the antenna, resulting in a narrow band characteristic.

The object of the present invention is to solve the above problems,
In the inverted F type antenna device built in the folding type portable radio communication device, a relatively wide band characteristic can be realized even when the frequency band of the radio wave used is relatively low and the ground conductor does not contribute to the excitation of the antenna. An object is to provide an antenna device and a portable wireless communication device using the antenna device.

Another object of the present invention is to reduce the influence from the human body and the radiation loss from the antenna device in the inverted F type antenna device incorporated in the folding type portable radio communication device. An object of the present invention is to provide an antenna device that can be used, and a portable wireless communication device using the antenna device.

[0008]

An inverted F type antenna device according to the present invention is a ground conductor, an antenna element arranged on the ground conductor so as to face the ground conductor, the ground conductor and the antenna. At least one coupling element provided so as to face the ground conductor and the antenna element between the element and a first element for electrically connecting the antenna element and the ground conductor at at least one location. And a connecting means of.

In the inverted F type antenna device, preferably, the ground conductor, the antenna element and the coupling element are provided so as to be substantially parallel to each other.

Further, in the above inverted F type antenna device,
Preferably, the distance between the antenna element and the ground conductor at the end where the antenna element and the ground conductor are electrically connected by the first connecting means is
It is characterized in that the antenna element and the connection conductor are provided so as to be different from the distance between the antenna element and the ground conductor at the other end opposite to the end.

Further, in the above-mentioned inverted F type antenna device, preferably, the coupling element is provided so as to be inclined with respect to the ground conductor.

Further, in the inverted F-type antenna device, preferably, the antenna element has a shape bent along a shape of a housing that houses the inverted F-type antenna device.

Further, in the above inverted F type antenna device,
Preferably, a part of at least one of the coupling element and the antenna element is bent and provided.

Further, in the inverted F type antenna device, preferably, a part of the ground conductor is provided by bending.

Furthermore, in the inverted F-type antenna device, preferably, the total length of the two different sides of the ground conductor is used in a portable wireless communication device using the inverted F-type antenna device. It is characterized by being ¼ or less of the wavelength corresponding to the lowest frequency band among the frequency bands.

In the above inverted F type antenna device,
Preferably, a second connecting means for electrically connecting the antenna element and the coupling element at at least one location is further provided.

Further, in the inverted F-type antenna device, preferably, the connection point by the second connecting means is
It is arranged in the vicinity of the connection point by the first connecting means.

Further, in the inverted F-type antenna device, preferably, when the inverted F-type antenna device is excited by a radio signal having a predetermined wavelength, the connection point of the second connection means is substantially The dimensions of the antenna element and the coupling element are set so that the coupling element is located at the antinode of the current standing wave generated in the antenna element and the coupling element, and the coupling element operates as a quarter-wave resonator. It is characterized by that.

Further, in the above inverted F type antenna device,
Preferably, the antenna element and the coupling element are electrically connected by a common feeding conductor.

Further, in the inverted F type antenna device, preferably, the antenna element and the coupling element are
It is characterized in that they are electrically connected by a common short-circuit conductor.

In the inverted F-type antenna device, preferably, the resonance frequency of the inverted F-type antenna device is adjusted by forming a slit in the antenna element.

Further, in the above inverted F type antenna device,
Preferably, the resonance frequency of the inverted F-type antenna device is set to
The adjustment is made by forming a slit in the coupling element.

Further, in the inverted F-type antenna device, preferably, the resonance frequency of the inverted F-type antenna device is adjusted by forming a slot in the antenna element.

Furthermore, in the inverted F-type antenna device, preferably, the resonance frequency of the inverted F-type antenna device is adjusted by forming a slot in the coupling element.

In the inverted F type antenna device,
Preferably, the amount of electromagnetic field coupling between the antenna element and the ground conductor is adjusted by changing the area of at least one of the antenna element and the coupling element.

Further, in the inverted F-type antenna device, preferably, the inverted F-type antenna device is characterized in that a part or the whole of the inside of the inverted F-type antenna device is filled with a dielectric.

Furthermore, in the above-mentioned inverted F type antenna device, it is preferable that the antenna device resonates in a plurality of frequency bands.
It is characterized in that the dimensions of the antenna element and the coupling element are set.

The portable wireless communication device according to the present invention is
21. A portable wireless communication device comprising: an upper casing, a lower casing, and a hinge portion that connects the upper casing and the lower casing, wherein the portable wireless communication device is any one of claims 1 to 20. The inverted F type antenna device is provided inside the upper housing.

The above portable radio communication device is preferably characterized by further comprising a monopole antenna.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments according to the present invention will be described below with reference to the drawings. In addition, in the drawings, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

First Embodiment. FIG. 1A is a plan view showing the configuration of an inverted F type antenna device 101 according to the first embodiment of the present invention, and FIG. 1B is AA ′ of FIG.
It is a longitudinal cross-sectional view about a line. 1 (a) and 1
As shown in (b), the inverted F-type antenna device 101 according to this embodiment has a coupling element 13 inserted between a ground conductor 11 and an antenna element 12 which are arranged so as to be parallel to each other. And connecting element 13 to connection conductor 2
3 is electrically connected to the antenna element 12.

In FIG. 1A and FIG. 1A, the inverse F
The antenna device 101 includes a ground conductor 11 having a rectangular flat plate shape.
And a feeding point 25 provided at a predetermined position of the ground conductor 11, the antenna element 12 formed of a rectangular flat plate-shaped conductor, and a cylindrical pin-shaped short-circuit conductor 22.
A cylindrical pin-shaped feed conductor 21, a coupling element 13 made of a rectangular flat plate-shaped conductor, and a cylindrical pin-shaped connection conductor 23 are provided.

The antenna element 12 and the grounding conductor 11 and the coupling element 13 are substantially parallel to each other and face each other, so that the connecting conductor 23, the short-circuit conductor 22 and the feeding conductor 2 are provided.
1, the antenna element 12 is electrically connected to the ground conductor 11 via the short-circuit conductor 22.
Further, one end of the feeding conductor 21 is electrically connected to the antenna element 12, and the other end of the feeding conductor 21 is connected to a feeding point 25 on the ground conductor 11. Further, the coupling element 13 is arranged between the ground conductor 11 and the antenna element 12 so as to be substantially parallel to the ground conductor 11 and the antenna element 12, and the coupling element 13 is connected to the antenna element 1 by the connection conductor 23.
2 is electrically connected. In this case, it is important that the connection conductor 23 is arranged near the short-circuit conductor 22 or the power supply conductor 21.

The coaxial cable 30 for feeding has a center conductor 31.
And a grounding conductor 33 wound around a center conductor 31 via a dielectric 32. The power feeding coaxial cable 30 is provided from a wireless device (not shown) of a portable wireless communication device. Feeding point 25 of the inverted F-type antenna device 101
Wired up to. Although a protective coating is formed around the ground conductor 33 of the power feeding coaxial cable 30, it is omitted in the drawing. At the feeding point 25, the center conductor 31 of the feeding coaxial cable 30 is connected to one end of the feeding conductor 21, and the ground conductor 33 of the feeding coaxial cable 30 is connected to the ground conductor 11.

Next, the operation principle of the inverted F type antenna device 101 according to this embodiment will be described. This inverted F type antenna device 101 includes an antenna element 12 and a short-circuit conductor 2
2, the coupling element 13 is inserted between the ground conductor 11 and the antenna element 12 in the PIFA portion including the feeding conductor 21, and the antenna element 12 and the coupling element 13 are electrically connected by the connection conductor 23. It has a structure. It is important that the connection conductor 23 is arranged in the vicinity of the antinode portion of the current standing wave generated on the antenna element 12 when the inverted F-type antenna device 101 is excited by a radio signal having a predetermined wavelength. Is. That is, it is important that one end of the connection conductor 23 is connected to the antenna element 23 in the vicinity of either the short-circuit conductor 22 or the power supply conductor 21, so that the coupling element 13 is in the vicinity of the connection point with the connection conductor 23. Serves as an antinode of the current standing wave (maximum point of current) and operates as a λ / 4 resonator. That is, it is preferable to set the lengths of the antenna element 12 and the coupling element 13 so as to operate in this way.

That is, the inverted F-type antenna device 101
In, there is an antenna device having the following two loop circuits. (A) From the feeding point 25 through the feeding conductor 21, the connecting conductor 23, and the coupling element 13, the end portion of the coupling element 13 (see FIG. 1).
(Lower side of the figure of (b)), from there, the coupling element 13, the connection conductor 23, a part of the antenna element 12 and the short-circuit conductor 22.
Set the length of the loop circuit from the
A first antenna device having a / 2 wavelength. (B) From the feeding point 25, through the feeding conductor 21 and the antenna element 12, to reach the terminal end portion of the antenna element 12 (the lower side of the drawing of FIG. 1B), from which the antenna element 12 and the short-circuit conductor 22 are connected. A second antenna device in which the length of the loop circuit reaching the grounding conductor 11 through the wavelength is 1/2 wavelength. Therefore, at the resonance frequencies of these two antenna devices, each of the antenna element 12 and the coupling element 13 preferably constitutes a quarter wavelength resonator.

The radio signal input via the feeding point 25 is fed through the feeding conductor 21 to the antenna element 12 and the coupling element 1.
3 is mainly radiated, but at this time, by slightly shifting the resonance frequency of the first antenna device and the resonance frequency of the second antenna device described above, it becomes possible to obtain a wide band frequency characteristic.

Reference numeral 201 in FIG. 2A indicates a reflection coefficient S of the first antenna device in the inverted F type antenna device 101 in FIG.
₁₁ is a graph showing the frequency characteristic of FIG.
02 is a graph showing the frequency characteristic of the reflection coefficient S ₁₁ of the second antenna device in the inverted F-type antenna device 101 of FIGS. 1 (a) and 1 (b), and 203 in FIG. 2 (c) is shown in FIG. 3 is a graph showing frequency characteristics of a reflection coefficient S ₁₁ when the first and second antenna devices are combined in the inverted F-type antenna device 101 of FIG.

Here, the frequency characteristic of the first antenna device including the coupling element 13 has the minimum reflection loss at the resonance frequency f1 as indicated by 201 in FIG. 2A, and the antenna element 12 is included. Consider a case where the frequency characteristic of the second antenna device is such that the amount of reflection loss is minimum at the resonance frequency f2 as indicated by 202 in FIG. At this time, the areas of the antenna element 12 and the coupling element 13 and the distance from the ground conductor 11 are adjusted so that the resonance frequency f1 and the resonance frequency f2 are slightly different from each other, so that the feeding point 2
The frequency characteristic of the reflection loss amount considering the antenna from 5 is as shown in 203 of FIG.
And the resonance frequency f2 has two peaks, and as a result, the frequency characteristic of the reflection loss amount of the entire antenna device realizes an extremely wide band frequency characteristic compared to that of each one antenna device. it can.

In the above embodiment, the coupling element 13 is set to λ.
Although the case of operating as a / 4 resonator has been described, the present invention is not limited to this, and the coupling element 13 may operate as a resonator having a resonance wavelength that is an odd multiple of λ / 4. Further, the coupling element 13 may be operated as a resonator having a resonance wavelength that is a multiple of λ / 4, and most preferably, the coupling element 13 is operated as a λ / 2 resonator. In this case, it is preferable that the antenna element 12 is connected to the connection conductor 23 at a portion serving as a node (current minimum point) of the current distribution, that is, an open end.

By filling a part or all of the area surrounded by the ground conductor 11 and the antenna element 12 with a dielectric, the resonance frequency can be reduced, and the size and weight of the same resonance frequency can be reduced. Moreover, since the shape of the antenna device can be stably fixed, variations in characteristics during mass production can be suppressed.

In the above embodiment, the power feeding conductor 2
1, the short-circuit conductor 22, and the connection conductor 23 have their respective end portions connected to the ground conductor 11, the antenna element 12, and the coupling element 13.
It is configured to be fixed and supported by being press-fitted into each hole formed in, and to be electrically connected,
The present invention is not limited to this, and these may be fixed and supported by soldering. These modified examples can also be applied to each embodiment described later.

In the above embodiment, the feeding conductor 2
1, the short-circuit conductor 22 and the connection conductor 23 are each formed to have a cylindrical pin shape, but the present invention is not limited to this, and may have a rectangular column pin shape, a rectangular flat plate shape, or a strip plate shape. You may form. These modified examples can also be applied to each embodiment described later.

Second Embodiment. FIG. 3A is a plan view showing the configuration of the inverted F type antenna device 102 according to the second embodiment of the present invention, and FIG. 3B is BB ′ of FIG. 3A.
It is a longitudinal cross-sectional view about a line. 3 (a) and 3
As shown in (b), the inverted F-type antenna device 102 according to this embodiment includes the ground conductor 11 and the feeding point 25, and the antenna element 12 formed of a rectangular flat plate-shaped conductor.
A short-circuit conductor 22, a feeding conductor 21, and a coupling element 13 made of a rectangular plate-shaped conductor.

In FIGS. 3A and 3B, the antenna element 12 is arranged so as to be substantially parallel to the ground conductor 11 and face each other, and the antenna element 12 is electrically connected to the ground conductor 11 by the short-circuit conductor 22. Connected. One end of the feeding conductor 21 is electrically connected to the antenna element 12, and the other end of the feeding conductor 21 is a feeding point 25 on the ground conductor 11.
In the same manner as in the first embodiment, the power feeding coaxial cable 30 is connected. Further, the coupling element 13 is inserted and arranged between the antenna element 12 and the ground conductor 11, and is electrically connected to the feeding conductor 21.

Also in the inverted F type antenna device 102 according to the present embodiment configured as described above, the antenna element 1
2 and the area of the coupling element 13, the distance from the ground conductor 11 to the antenna element 12 and / or the distance from the ground conductor 11 to the coupling element 13 are adjusted to adjust the resonance frequency of the antenna device of the two loop circuits. A wide range of frequency characteristics can be obtained by slightly shifting them from each other, and the feeding conductor 21 is connected to the connection conductor 2 according to the first embodiment.
By making it function as 3, the antenna structure can be simplified, which is suitable for mass production.

Modification of Second Embodiment. FIG. 4 is a vertical cross-sectional view showing the configuration of the inverted F-type antenna device 102a according to the first modification of the second embodiment of the present invention. The inverted F-type antenna device 102a is different from the inverted F-type antenna device 102 according to the second embodiment in that the ground conductors 11 are formed on two different surfaces of the dielectric substrate 41.
And the coupling element 13 and the antenna element 12 formed on the dielectric substrate 42, and the feeding conductor 21 and the short-circuit conductor 22 are respectively formed in the through holes penetrating the dielectric substrates 41 and 42 in the thickness direction. It is characterized by being configured by using a through-hole conductor filled with a conductor. Here, the coupling element 13 is electrically connected to the feeding conductor 21, but not electrically connected to the short-circuit conductor 22. The coupling element 13 may be formed on the dielectric substrate 42. The inverted F-type antenna device 102a configured as described above has the same operation and effect as those of the first and second embodiments, and the dielectric substrates 41 and 42.
The thickness between the ground conductor 11 and the coupling conductor 13, and the coupling conductor 13 and the antenna element 1 are changed by changing the respective thicknesses of
The distance between the two can be changed, and the amount of electromagnetic field coupling between them can be adjusted.

FIG. 5 is a vertical cross-sectional view showing the structure of an inverted F type antenna device 102b according to a second modification of the second embodiment of the present invention. This inverted F type antenna device 102b is
Compared to the inverted F-type antenna device 102 according to the second embodiment, the space between the ground conductor 11 and the antenna element 12 is filled with the dielectric material 45, so that the inverted F-type antenna device 102b can be formed. Each component can be securely fixed and supported.

FIG. 6 is a vertical cross-sectional view showing the structure of an inverted F type antenna device 102c according to a third modification of the second embodiment of the present invention. This inverted F type antenna device 102c is
Compared to the inverted F type antenna device 102 according to the second embodiment, the grounding conductor 11 formed on the dielectric substrate 43 is used to configure a part of the coupling element 13 on the lower side of the drawing. Filling the space between the dielectric substrate 43 and the dielectric 46, and filling the space between the antenna element 12 and the lower part of the coupling element 13 in the figure with the dielectric 47. Thereby, each component of the inverted F type antenna device 102c can be securely fixed and supported.

FIG. 7 is a vertical cross-sectional view showing the structure of an inverted F type antenna device 102d according to a fourth modification of the second embodiment of the invention. This inverted F type antenna device 102d is
As compared with the inverted F type antenna device 102 according to the second embodiment, the dielectric 46 is filled in the space between the lower portion of the coupling element 13 in the drawing and the ground conductor 11, and By filling the space between the antenna element 12 and a part of the lower part of the coupling element 13 in the drawing, each component of the inverted F-type antenna device 102d is reliably fixed by filling the dielectric 47. Can be supported.

Third Embodiment. FIG. 8A is a plan view showing the configuration of the inverted F type antenna device 103 according to the third embodiment of the present invention, and FIG. 8B is a vertical cross section taken along the line CC ′ of FIG. It is a figure. As shown in FIGS. 8A and 8B, the inverted F type antenna device 10 according to the present embodiment.
3 includes a ground conductor 11 and a feeding point 25,
The antenna element 12 is formed of a rectangular plate-shaped conductor, the short-circuit conductor 22, the feeding conductor 21, and the coupling element 13 is formed of a rectangular plate-shaped conductor. Here, the short-circuit conductor 22 is used as a connection conductor.

In FIGS. 8A and 8B, the antenna element 12 is arranged so as to be substantially parallel to and opposite to the ground conductor 11, and the antenna element 12 is electrically connected to the ground conductor 11 by the short-circuit conductor 22. Connected. One end of the feeding conductor 21 is electrically connected to the antenna element 12, and the other end of the feeding conductor 21 is a feeding point 25 on the ground conductor 11.
In the same manner as in the first embodiment, the power feeding coaxial cable 30 is connected. Further, the coupling element 13 is inserted and arranged between the antenna element 12 and the ground conductor 11, and is electrically connected to the short-circuit conductor 22.

Also in the inverted F type antenna device 103 according to this embodiment configured as described above, the antenna element 1
2 and the area of the coupling element 13, the distance from the ground conductor 11 to the antenna element 12 and / or the distance from the ground conductor 11 to the coupling element 13 are adjusted to adjust the resonance frequency of the antenna device of the two loop circuits. A wide range of frequency characteristics can be obtained by slightly shifting them from each other, and the short-circuit conductor 22 is connected to the connection conductor 2 according to the first embodiment.
By making it function as 3, the antenna structure can be simplified, which is suitable for mass production.

Modification of the third embodiment. FIG. 9 is a vertical cross-sectional view showing the configuration of the inverted F-type antenna device 103a according to the first modification of the third embodiment of the present invention. The inverted F-type antenna device 103a is different from the inverted F-type antenna device 103 according to the third embodiment in that the ground conductor 11 and the coupling element 13 are formed on two different surfaces of the dielectric substrate 41. And the antenna element 12 formed on the dielectric substrate 42. The feeding conductor 21 and the short-circuit conductor 22 are filled with metal conductors in through holes penetrating the dielectric substrates 41 and 42 in the thickness direction. It is characterized in that it is configured by using a through-hole conductor.
Here, the coupling element 13 is electrically connected to the short-circuit conductor 22, but is not electrically connected to the feeding conductor 21. In addition,
The coupling element 13 may be formed on the dielectric substrate 42. The inverted F-type antenna device 103a configured as described above has the same effects as those of the first to third embodiments, and the thickness of the dielectric substrates 41 and 42 is changed to be grounded. The distance between the conductor 11 and the coupling conductor 13, and the coupling conductor 13 and the antenna element 12
The distance between and can be changed, and the electromagnetic field coupling amount between them can be adjusted.

FIG. 10 is a vertical sectional view showing the structure of an inverted F type antenna device 103b according to a second modification of the third embodiment of the present invention. This inverted F type antenna device 103b is
Compared to the inverted F-type antenna device 103 according to the third embodiment, the space between the ground conductor 11 and the antenna element 12 is filled with the dielectric 45, so that the inverted F-type antenna device 103b can be formed. Each component can be securely fixed and supported.

FIG. 11 is a vertical sectional view showing the structure of an inverted F type antenna device 103c according to a third modification of the third embodiment of the present invention. This inverted F type antenna device 103c is
Compared with the inverted F type antenna device 103 according to the third embodiment, the grounding conductor 11 formed on the dielectric substrate 43 is used to configure a part of the coupling element 13 on the lower side of the drawing. Filling the space between the dielectric substrate 43 and the dielectric 46, and filling the space between the antenna element 12 and the lower part of the coupling element 13 in the figure with the dielectric 47. Thereby, each component of the inverted F-type antenna device 103c can be securely fixed and supported.

FIG. 12 is a vertical sectional view showing the structure of an inverted F type antenna device 103d according to a fourth modification of the third embodiment of the present invention. This inverted F type antenna device 103d is
Compared with the inverted F type antenna device 103 according to the third embodiment, the space between the lower part of the coupling element 13 in the drawing and the ground conductor 11 is filled with the dielectric 46, and By filling the space between the antenna element 12 and a part of the lower part of the coupling element 13 in the drawing, each element of the inverted F-type antenna device 103d is securely fixed by filling the space with the dielectric 47. Can be supported.

Fourth Embodiment. FIG. 13A is a plan view showing the configuration of the inverted F type antenna device 104 according to the fourth embodiment of the present invention, and FIG. 13B is the D of FIG. 13A.
It is a longitudinal cross-sectional view about the -D 'line. As shown in FIGS. 13A and 13B, this inverted F type antenna device 1
04 is another coupling between the coupling element 13 and the ground conductor 11 as compared with the inverted F type antenna device 103 according to the second embodiment shown in FIGS. 3 (a) and 3 (b). Element 14
It is characterized by inserting and placing. Here, the coupling element 14 is electrically connected to the feeding conductor 21, but not to the short-circuit conductor 22.

In the inverted F type antenna device 104 configured as described above, the antenna element 12 and the coupling element 1 are used.
The area of 3, 14 and the coupling element 13, 1 from the ground conductor 11
4 or each distance to the antenna element 12 is adjusted so that the resonance frequencies of the plurality of antenna devices forming the plurality of loop circuits are slightly shifted from each other, whereby a wide band characteristic can be obtained. Further, by using the plurality of coupling elements 13 and 14, it is possible to perform impedance matching between the antenna device 104 and the feeding coaxial cable 30 so as to cover a plurality of frequency bands. Furthermore, similarly to the first to fourth modifications of the second embodiment,
A part or all of the space between the ground conductor 11 and the antenna element 12 may be filled with a dielectric or a dielectric substrate may be arranged. In this case, the effect of reducing the resonance frequency can be expected and the shape can be reduced. By fixing it stably, it is possible to suppress variations in characteristics during mass production.

Fifth Embodiment. FIG. 14A is a plan view showing the configuration of the inverted F-type antenna device 105 according to the fifth embodiment of the present invention, and FIG. 14B is the E of FIG. 14A.
It is a longitudinal cross-sectional view about the -E 'line. As shown in FIGS. 14A and 14B, this inverted F-type antenna device 1
Reference numeral 05 denotes the inverted F type antenna device 10 according to the second embodiment.
As compared with 2, the antenna element 12a is formed with a plurality of slits 12s parallel to the short side direction to form the lower part of the antenna element 12a in the meander shape and the coupling element 13a has the short side. By forming a plurality of slits 13s parallel to the direction, the coupling element 13a
The lower part of the figure is formed in a meander shape.

In the inverted F type antenna device 105 configured as described above, the antenna element 12a and the feeding element 1
By forming a plurality of slits 12s and 13s respectively in 3a, the resonance frequency is reduced by the increase of the path length and the reactance component is increased, and the reactance component is increased by the reduction of the coupling amount with the decrease of the area. The effect can be obtained. Utilizing this,
In addition to facilitating impedance matching between the antenna device 105 and the feeding coaxial cable 30 and adjusting the resonance frequency of the antenna device 105, the resonance frequency of the antenna device 105 can be reduced, and the antenna It is possible to reduce the size and weight of the device 105. That is, when the capacitive coupling between the antenna element 12a and the coupling element 13a and the capacitive coupling between the coupling element 13a and the ground conductor 11 are relatively large, they face each other while keeping the path length constant. Slit 12 to reduce the area
By adjusting the areas of s and 13s, it is possible to reduce the capacitive coupling between them and achieve impedance matching. Furthermore, the antenna element 12a and the coupling element 13
The impedance matching can be easily adjusted by adjusting the distance between a and the coupling element 13a and the connection conductor 11.

In the above embodiment, the slits 12 are provided in both the antenna element 12a and the coupling element 13a.
Although a configuration example in which s and 13s are provided is shown, the present invention is not limited to this and the antenna element 12a and the coupling element 13 are not limited thereto.
slits 12s and 13s in at least one of a and
May be provided. In addition, a slot is provided in at least one of the antenna element 12a and the coupling element 13a, and the electromagnetic field coupling amount between the antenna element 12a and the coupling element 13a,
By adjusting the electromagnetic field coupling amount between the coupling element 13a and the ground conductor 11, the impedance matching between the input impedance of the antenna device 105 and the feeding coaxial cable 30 can be easily adjusted. Also, the antenna element 1
By providing a slot in at least one of 2a and the coupling element 13a, the resonance frequency of the antenna element can be adjusted.

In the above embodiment, one coupling element 13a is provided, but the present invention is not limited to this, and two or more coupling elements 13a are provided between the antenna element 12a and the ground conductor 11. By inserting and arranging, a wider frequency characteristic can be realized. In this case, by using the plurality of coupling elements 13a, it becomes possible to perform impedance matching so as to cover a plurality of frequency bands.

The same effect can be obtained by forming a slit in the ground conductor 11 and adjusting the electromagnetic field coupling amount between the ground conductor 11 and the antenna element 12a. Furthermore, in the above embodiment, the power supply conductor 21
Although an example of the configuration in which the
The present invention is not limited to this, and the short-circuit conductor 22 may be used as the connection conductor, or the coupling element 13a and the antenna element 12a may be used.
You may separately provide the connection conductor for connecting with. Further, a part or all of the space surrounded by the ground conductor 11 and the antenna element 12a may be filled with a dielectric, and in this case, the effect of reducing the resonance frequency can be obtained, and the shape is stably fixed. Therefore, it is possible to suppress variations in electrical characteristics during mass production.

Modification of the fifth embodiment. FIG. 15A is a plan view showing the configuration of an inverted F-type antenna device 105a according to a modification of the fifth embodiment of the present invention, and FIG.
FIG. 16 is a vertical sectional view taken along the line FF ′ of FIG. As shown in FIGS. 15A and 15B, the inverted F-type antenna device 105a is different from the inverted F-type antenna device 105 according to the fifth embodiment in the antenna element 1.
A plurality of slits 12s formed in 2b and a coupling element 1
It is characterized in that a plurality of slits 13s formed in 3b are formed so as to face each other. In the inverted F type antenna device 105a configured as described above, as shown in FIG.
The directions 901 and 902 of the current flowing on b can be made to coincide with the directions 911 and 912 of the current flowing on the coupling element 13b, respectively, and by aligning the directions of these currents, the inverted F-type antenna device 105a can be The radiation efficiency can be improved and the antenna gain can be improved.

Sixth Embodiment. FIG. 16A is a plan view showing the configuration of the inverted F type antenna device 106 according to the sixth embodiment of the present invention, and FIG. 16B is the G of FIG. 16A.
It is a longitudinal cross-sectional view about the line -G '. As shown in FIGS. 16A and 16B, this inverted F-type antenna device 1
Compared with the inverted F type antenna device 102 shown in FIGS. 3A and 3B, 06 is configured by bending the coupling element 13c at two positions parallel to the short side direction at a right angle. The coupling element 13c includes (i) a portion 13ca parallel to the ground conductor 11 and the antenna element 12, and (ii) a portion 1 orthogonal to the ground conductor 11 and the antenna element 12.
3cb, (iii) ground conductor 11 and antenna element 12
And a portion 13cc parallel to. Here, the distance between the portion 13cc and the antenna element 12 is equal to that of the portion 1
The distance is shorter than the distance between 3ca and the antenna element 12, and the electromagnetic field coupling amount between the antenna element 12 and the coupling element 13c is set to be large.

That is, a part of the coupling element 13c is bent and has a stepped shape with a step, whereby the distance between the ground conductor 11 and the coupling element 13c and the antenna element 12 and the coupling element 13c. The distance between the antenna element 12 and the ground conductor 11 is changed depending on the position in the longitudinal direction between the antenna element 12 and the ground conductor 11.
Side electrically connected by 2 (short-circuit conductor 22 side)
Portion 13ca and the opposite end portion 13c on the open end side
In c, the distances are different from each other. Accordingly, the distance between the antenna element 12 and the coupling element 13c and the distance between the ground conductor 11 and the coupling element 13c are
It is possible to change them depending on the positions in the longitudinal direction, and to adjust the electromagnetic field coupling amount between the coupling element 13c and the antenna element 12 and the electromagnetic field coupling amount between the coupling element 13c and the ground conductor 11. Since it is possible to adjust the frequency during manufacturing, it is suitable for mass production. Further, by bending the coupling element 13c and applying a three-dimensional deformation, the electrical length of the coupling element 13c can be made longer than that in the case of the planar structure, so that the resonance frequency of the antenna device 106 is lowered. Therefore, the antenna device 106 can be reduced in size and weight.

In the present embodiment, as shown in FIG. 16B, a part of the coupling element 13c is bent to bring the antenna element 12 closer to the open end thereof, and
The amount of electromagnetic field coupling between the coupling element 13c and the antenna element 12 can be increased, and the resonance frequency of the antenna device can be further reduced. Further, as shown in FIG. 16B, the inverted F type antenna device 10
By separating the distance between the coupling element 13c and the ground conductor 11 at the end of 6, it is possible to reduce electromagnetic field coupling with components such as a transceiver arranged near the antenna device 106, It is possible to prevent malfunctions in transceivers and the like.

Modification of the sixth embodiment. 17A is a plan view showing the configuration of the inverted F-type antenna device 106a according to the first modification of the sixth embodiment of the present invention, and FIG.
17B is a vertical cross-sectional view taken along the line HH ′ of FIG. This inverted F type antenna device 106a is shown in FIG.
Compared to the inverted F type antenna device 106 according to the sixth embodiment shown in FIG. 9B, the coupling element 13 is not bent,
The antenna element 12c is configured by being bent at a right angle at two locations parallel to the short side direction of the antenna element 12c.
c is (i) a portion 12ca parallel to the ground conductor 11 and the coupling element 13, (ii) a portion 12cb orthogonal to the ground conductor 11 and the coupling element 13, and (iii) a ground conductor 11
And a portion 12cc parallel to the coupling element 13. Here, the distance between the portion 12cc and the coupling element 13 is shorter than the distance between the portion 12ca and the coupling element 13, and the electromagnetic field coupling amount between the antenna element 12c and the coupling element 13c increases. Is set. The inverted F-type antenna device 106a according to the first modification example of the sixth embodiment configured as described above has the same effects as the inverted F-type antenna device 106 according to the sixth embodiment.

FIG. 18 is a vertical sectional view showing the structure of an inverted F type antenna device 106b according to a second modification of the sixth embodiment of the present invention. In FIG. 18, a liquid crystal display unit 41 is arranged on the front surface side of the central portion in the longitudinal direction of the upper casing 40 of the folding type portable wireless communication device. A dielectric substrate 43 is arranged on the back side of the liquid crystal display unit 41, and the ground conductor 1 is provided on the surface of the dielectric substrate 43 on the liquid crystal display unit 41 side.
1 is formed. An inverted F type antenna device 106b having the following configuration is provided on the upper side of the dielectric substrate 43. This inverted F-type antenna device 106b is basically
Similar to the structure of the inverted F type antenna device 102 according to the second embodiment illustrated in FIG. 3B, the antenna element 12d including the ground conductor 11 and the feeding point 25 and a rectangular flat plate-shaped conductor is provided. And the short-circuit conductor 22 and the feeding conductor 2
1 and a coupling element 13 made of a rectangular plate-shaped conductor. Here, the antenna element 12d is characterized in that it is bent in a curved shape along the housing shape of the upper housing 40. This has a unique effect that the inverted F-type antenna device 106b can be compactly housed in the upper housing 40.

FIG. 19 is a vertical sectional view showing a structure of an inverted F type antenna device 106c according to a third modification of the sixth embodiment of the present invention. In FIG. 19, a liquid crystal display unit 41 is arranged on the front surface side of the central portion in the longitudinal direction of the upper casing 40 of the folding type portable wireless communication device. On the back side of the liquid crystal display unit 41, the ground conductor 11 made of, for example, a rectangular metal plate is arranged by being bent along the shape of the liquid crystal display unit 41. Using this ground conductor 11, an inverted F-type antenna device 106c having the following configuration is provided on the upper side of the upper casing 40. This inverted F type antenna device 106
c is basically the same as the structure of the inverted F type antenna device 102 according to the second embodiment shown in FIG. 3B,
In addition to the ground conductor 11 and the feeding point 25, the antenna element 12d made of a rectangular plate-shaped conductor, the short-circuit conductor 22, the feeding conductor 21, and the coupling element 13 made of a rectangular plate-shaped conductor are configured. To be done. Here, the antenna element 12d is characterized in that it is bent in a curved shape along the housing shape of the upper housing 40. Thereby, there is a peculiar effect that the inverted F-type antenna device 106c can be compactly housed in the upper housing 40.

In the above sixth embodiment and its modification, at least the antenna elements 12, 12c and 12d are used.
Alternatively, by arranging one of the coupling elements 13 and 13c so as to be inclined with respect to the ground conductor 11, the antenna element 12,
It is possible to adjust the amount of electromagnetic field coupling between the coupling elements 13 and 13c and the connecting conductor 11 and the amount of electromagnetic field coupling between the coupling elements 13 and 13c. Also in this case, impedance matching and resonance frequency adjustment can be performed.

In the above sixth embodiment and its modified example, one coupling element 13, 13c is provided, but the present invention is not limited to this, and two or more coupling elements 1 are provided.
By configuring with 3 and 13c, it is possible to realize a wider band frequency characteristic. In this case, impedance matching can be performed so as to cover a plurality of frequency bands by using the plurality of coupling elements 13 and 13c.

In the above-described sixth embodiment and its modification, slits or slots are formed in at least one of the antenna elements 12, 12c and 12d, the coupling elements 13 and 13c, and the ground conductor 11. Good. In this case, the same effect as the above can be obtained. Also,
In the above-described sixth embodiment and its modification, the feeding conductor 21 has the function of the connection conductor, but instead of this, the short-circuit conductor 21 may have the function of the connection conductor,
Alternatively, another connecting conductor may be provided.

Further, similarly to the various modifications of the second embodiment shown in FIGS. 4 to 7, a part or all of the space surrounded by the ground conductor 11 and the antenna elements 12, 12c, 12d is formed. It may be filled with a dielectric, in which case,
The effect of reducing the resonance frequency of the antenna device can be obtained, and the constituent elements of the antenna device can be stably fixed, so that variations in electrical characteristics during mass production can be suppressed.

Seventh Embodiment. 20A is a plan view showing the configuration of the inverted F type antenna device 107 according to the seventh embodiment of the present invention, and FIG. 20B is a plan view of the antenna element 12e of FIG. 20A. Yes, and FIG. 20 (c) is FIG.
20 is a plan view of the coupling element 13e of 0 (a), and FIG.
20D is a plan view of the coupling element 14e of FIG. 20A. In addition, FIG. 21 is a vertical cross-sectional view taken along the line II ′ of FIG. The inverted F-type antenna device 107 relates to an embodiment prototyped by the present inventors, and the dimensions (unit: mm) of each constituent element are shown in these drawings.

20 (a) to 20 (d) and FIG. 21.
In the inverted F-type antenna device 1 having the feeding point 25 on the ground conductor 11 having a length of 70 mm and a width of 43 mm
07 is provided, and the inverted F-type antenna device 107 is
(I) A length of 17 mm and a width of 43 shown in FIG.
an antenna element 12e having a size of mm, and (ii) FIG.
The coupling element 13e illustrated in (c) and (iii) FIG.
The coupling element 14e illustrated in (d), (iv) the short-circuit conductor 22 for electrically connecting the antenna element 12e to the ground conductor 11, and (v) the two center conductors 31 of the feeding coaxial cable 30. And a feeding conductor 21 for electrically connecting to the antenna element 12e via the coupling elements 13e and 14e. Here, an L-shaped strip-shaped slit 12es is formed in the antenna element 12e,
The coupling element 13e has a linear strip-shaped slit 1
3es are formed, and these slits 12es,
By adjusting the length or area of 13es and changing the element length of the antenna device and the electromagnetic field coupling amount, impedance matching between the input impedance of the antenna device and the characteristic impedance of the feeding coaxial cable 30 can be facilitated. Can be adjusted.

Further, as shown in FIG. 2, the antenna element 1
2e is disposed so as to be inclined with respect to the ground conductor 11 such that the height from the ground conductor 11 on the power supply conductor 21 side is 9.2 mm and the height from the ground conductor 11 on the open end side is 7.9 mm. ing. Similarly, the coupling elements 13e and 14e are also arranged to be inclined with respect to the ground conductor 11, and the coupling element 1
3e and 14e, the ground conductor 11 on the side of the power supply conductor 21
The heights from are 8.1 mm and 6.6 mm, respectively.
The height from the ground conductor 11 on the open end side is 6.7 m.
m and 4.7 mm. By changing the distance between each of the antenna element 12e and the coupling elements 13e and 14e and the ground conductor 11 depending on the position in the longitudinal direction thereof, the antenna element 12e and the coupling elements 13e and 1e.
4e and the ground conductor 11, and the amount of electromagnetic field coupling between them can be adjusted, and the resonance frequency of the antenna device 107 can be adjusted to be lowered. Impedance matching with the coaxial cable 30 can be easily adjusted,
Furthermore, a wider band characteristic can be realized.

In the seventh embodiment described above, one end of the feeding conductor 21 is electrically connected to the antenna element 12e,
The other end of the power feeding conductor 21 is connected to the center conductor 31 of the power feeding coaxial cable 30 via a power feeding point 25 on the ground conductor 11. It should be noted that the coupling elements 13e and 14e are electrically connected to the power feeding conductor 21, respectively, but it is important that they are not electrically connected to the short-circuit conductor 22. That is, the diameter of the short-circuit conductor 22 is smaller than that of the through holes 13eh and 14eh formed in the coupling elements 13e and 14e, respectively, and since the short-circuit conductor 22 passes through the central portions of these through holes 13eh and 14eh, the short-circuit conductor 22 is formed.
e, 14e are not electrically connected.

FIG. 22 is a Smith chart showing the frequency characteristic of the input impedance of the inverted F type antenna device 107 shown in FIGS. 20A and 21, and FIG.
0 (a) and the inverted F-type antenna device 1 shown in FIG.
It is a graph which shows the frequency characteristic of the voltage standing wave ratio (VSWR) of 07.

As is clear from FIG. 22, there are a plurality of resonance circles, and it can be seen that the antenna device has multiple resonances. In FIG. 23, the frequency range in which VSWR is 3 or less is 905 to 1024 MHz, and the ratio band is 12.3%, and a wide band frequency characteristic can be obtained.

In the above embodiment, even if the dimension obtained by adding the short side and the long side of the ground conductor 11 is very small, which is ¼ or less of the wavelength, a wide band characteristic can be realized. Further, since it becomes possible to easily adjust the impedance characteristic of the antenna device 107, the grounding conductor 1 having a relatively small size with respect to the wavelength is used in a mobile wireless communication device such as a folding type mobile phone.
This is suitable when the antenna device is formed on the first antenna.

In the above embodiment, a part or the whole of the space surrounded by the ground conductor 11 and the antenna element 12e may be filled with a dielectric, and in this case, the effect of reducing the resonance frequency of the antenna device is obtained. In addition, since the shape of the antenna device can be stably fixed, it is possible to suppress characteristic variations during mass production.

Modification of Seventh Embodiment. FIG. 24 shows FIG.
(A) and the inverted F type antenna device 10 shown in FIG.
It is a modification of the antenna element in 7, and is a top view which shows the structure of the antenna element 12f which concerns on the 1st modification of 7th Embodiment. As shown in FIG. 24, the antenna element 12f is formed to have a slot 12ss of a predetermined shape, and the antenna element 12f has a rectangular ring-shaped conductor portion 12fa and a rectangular patch-shaped conductor portion 1.
2fc, these conductor portions 12fa and conductor portions 12f
and a strip-shaped conductor portion 12fb for connecting with c. Antenna element 1 having the above shape
2f has a peculiar effect that a substantial element length can be lengthened and an electromagnetic field coupling amount with another conductor can be increased. In addition, the antenna element 12
By forming the slot 12ss at f, the resonance frequency of the antenna device can be adjusted.

FIG. 25 shows a modification of the coupling element in the inverted F type antenna device 107 shown in FIGS. 20 (a) and 21 and is a coupling element 13f according to the second modification of the seventh embodiment. 2 is a plan view showing the configuration of FIG. Coupling element 13f
As shown in FIG. 25, the slot 13s having a predetermined shape
The coupling element 13f has a rectangular ring-shaped conductor portion 13fa, a rectangular patch-shaped conductor portion 13fc, and a strip-shaped conductor portion that connects these conductor portions 13fa and 13fc. 1
And 3fb. The coupling element 13f having the above-described shape can increase the substantial element length,
Moreover, there is a unique effect that the amount of electromagnetic field coupling with other conductors can be increased. In addition, the coupling element 1
By forming the slot 13ss in 3f,
The resonance frequency of the antenna device can be adjusted.

Eighth Embodiment. FIG. 26 (a) is a plan view showing the configuration of the inverted F type antenna device 108 according to the eighth embodiment of the present invention, and FIG. 26 (b) is a J of FIG. 26 (a).
It is a longitudinal cross-sectional view about the line -J '. The inverted F-type antenna device 108 includes an antenna element 12 and a ground conductor 11 in comparison with the inverted F-type antenna device 102 according to the second embodiment illustrated in FIGS. 3A and 3B. It is characterized in that it is inserted and arranged between the coupling element 13 and
Other configurations are similar to those of the second embodiment. In addition, one end of the feeding conductor 21 is electrically connected to the coupling element 13,
The power feeding conductor 21 is electrically connected to the antenna element 12 at a substantially central portion thereof, and the other end of the power feeding conductor 21 is connected to the center conductor 31 of the power feeding coaxial cable 30. Moreover, one end of the short-circuit conductor 22 is connected to the antenna element 12, and the other end is electrically connected to the ground conductor 11.

The inverted F-type antenna device 108 according to the eighth embodiment configured as described above has the same operation and effect as the inverted F-type antenna device 102 according to the second embodiment. Further, also in this inverted F type antenna device 108,
As shown in each modification of the second embodiment, the coupling element 13
A part or all of the space between the ground conductor 11 and the ground conductor 11 may be filled with a dielectric, and in this case, the effect of reducing the resonance frequency of the antenna device and the effect of suppressing characteristic variations during mass production can be obtained.

Ninth Embodiment. 27A is a plan view showing the configuration of the mobile wireless communication device 1101 according to the ninth embodiment of the present invention, and FIG. 27B is a side view of FIG. 27A. 27 (a) and 27 (b),
The mobile wireless communication device 1101 is a configuration example of a folding type mobile phone, and includes an upper housing 1102 and a lower housing 1.
103, and a hinge portion 1104 that is a mechanism portion that connects the upper housing 1102 and the lower housing 1103, and folds and stacks them on top of each other. Here, the upper housing 110
2, a liquid crystal display unit 1105 is provided at a substantially central portion, an upper dielectric substrate 1108 is arranged on the lower side in the thickness direction thereof, and a built-in antenna 1110 is provided above the dielectric substrate 1108 in the drawing for feeding power. The power is supplied from the section. Further, a numeric keypad portion 1106 is provided at a substantially central portion of the lower housing 1003, and a lower dielectric substrate 1109 is arranged on the lower side in the thickness direction thereof. A whip antenna 1107 made up of a helical antenna 1107a and a monopole antenna 1107b is provided to extend and retract with respect to the lower housing 1003, and power is supplied from a power supply unit (not shown).

In this embodiment, the built-in antenna 11
10 can be configured in any of the above-described first to eighth embodiments or modifications thereof. Here, the built-in antenna 1110 and the whip antenna 1107 can be controlled to use at least one of these two antennas at the time of transmission and reception by using a space diversity technique.

In the portable radio communication device 1101 configured as described above, the built-in antenna 1110 has a wide band even when the size of the ground conductor formed on the back surface of the upper dielectric substrate 1108 is 1/4 or less of the wavelength. Since various characteristics can be realized, good communication quality can be obtained. In addition, the built-in antenna 1110 is installed in the upper housing 110.
By arranging in the upper part of the inside of 2, it is possible to reduce the influence of human body such as a finger during a call, thereby reducing the radiation loss of the radio wave from the portable wireless communication device 1101, and the antenna gain of the built-in antenna 1110. Can be increased.

Although the whip antenna 1107 is provided in the lower housing 1103 in the above embodiment,
The present invention is not limited to this, and may be provided in the upper housing. Further, the built-in antenna 1110 may be arranged below the upper housing 1102 or below the lower housing 1103.

Modification of the ninth embodiment. FIG. 28 (a) is a plan view showing the configuration of a portable wireless communication device 1101a according to a modification of the ninth embodiment of the present invention, and FIG. 28 (b).
FIG. 29 is a side view of FIG. 28 (a) and 2
8 (b), this portable wireless communication device 1101a
Is characterized by removing the whip antenna 1107 in the lower housing 1103, as compared with the portable wireless communication device 1101 according to the ninth embodiment.

Tenth Embodiment. 29A is a partially cutaway plan view showing the configuration of the portable wireless communication device 2100 according to the tenth embodiment of the present invention, and FIG. 29B is shown in FIG.
FIG. 9 (a) is a side view. 29 (a) and 29 (b), the same components as those in FIGS. 28 (a) and 28 (b) are designated by the same reference numerals. FIG. 29
29A and 29B, the above-described built-in antenna 1110 formed on the dielectric substrate 1108 of the upper housing 1102 is provided, and the flexible dielectric in which the conductor patterns 2702a and 2702b are formed in the hinge portion 1104. The body substrate 2702 is provided and the conductor pattern 27 is provided.
02a and 2702b each have an upper dielectric substrate 110.
8 is connected to a connector 2109 formed on
The other ends of the conductor patterns 2702a and 2702b are connected to the connector 2110 formed on the lower dielectric substrate 1109.

Here, the strip-shaped conductor pattern 2703 formed on the upper dielectric substrate 1108 is connected to the conductor pattern 2702a via the connector 2109, and the conductor pattern 2702a is further connected to the connector 21.
It is connected to the feeding point 2111 via 10. The conductor pattern from this conductor pattern 2703 to the feeding point 2111 constitutes one monopole antenna.
Then, the monopole antenna and the built-in antenna 11
10 can be controlled to use at least one of these two antennas at the time of transmission and reception by using a space diversity technique.

Eleventh Embodiment. 30A is a plan view showing the configuration of the built-in antenna device 2200 according to the eleventh embodiment of the present invention, and FIG. 30B is the same as FIG. 30A.
3 is a side view showing the configuration of the built-in antenna device 2200 of FIG. The built-in antenna device 2200 of the eleventh embodiment
Is used instead of the built-in antenna device 1110 described above, and includes a bent ground conductor 11a and an antenna element 12g formed in a meandering shape on the dielectric substrate 42 (similar to the antenna element 12 and the like described above). Antenna element 12h in the form of a strip, which is formed by being connected to the antenna 12g on the dielectric substrate 42 and operates as a monopole antenna.
g and the grounding conductor 11a, the coupling element 13 is inserted and arranged, the feeding conductor 21 for connecting the feeding point and the antenna element 12g, the antenna element 12g and the coupling element 1
3 and a connection conductor 22 for connecting to each other. Here, the feeding conductor 21 is connected to the coupling conductor 13 and the antenna element 12g, while the short-circuit conductor 22 is connected to the antenna element 12g without being connected to the coupling conductor 13. Then, the antenna element 12g provided with the coupling element 13 and the antenna element 12h can be used as a wide-band built-in antenna device 2200 capable of covering a plurality of frequency bands by making the respective resonance frequencies different from each other.

In the embodiment configured as described above, by disposing the built-in antenna device 2200 inside the upper casing 1102, it is possible to reduce the influence of the human body such as a finger during a call. Radiation loss of radio waves from the portable wireless communication device can be reduced, and the antenna gain of the built-in antenna device 2200 can be substantially increased.

[0097]

As described in detail above, according to the inverted F type antenna device of the present invention, the coupling element is inserted between the unbalanced antenna element and the ground conductor to connect the antenna element and the ground conductor. Is provided with a connecting means for electrically connecting at least one place.

By the coupling element, the coupling amount between the antenna element and the coupling element, the coupling amount between the antenna element and the ground conductor, or the coupling between the coupling element and the ground conductor. By adjusting the amount, the resonance frequency of the antenna device provided with the coupling element and the resonance frequency of the antenna device when not provided with the coupling element are made different from each other, whereby a wide band frequency characteristic can be obtained. Become. Further, the resonance frequency of the antenna device can be shifted and adjusted so as to correspond to a plurality of frequency bands. Further, since the connecting means is shared with the feeding conductor or the short-circuit conductor, the structure can be simplified, which is suitable for mass production. Further, by providing the slits or slots, it is possible to reduce the resonance frequency, and it is possible to adjust the coupling amount between the antenna element and the coupling element and / or the ground conductor. Note that the coupling amount between the antenna element and the ground conductor can be adjusted by inclining the coupling element with respect to the antenna element or the connection conductor or providing a step in the coupling element or the antenna element. It will be possible.

The antenna device configured as described above is
By arranging the folding type portable wireless communication device inside the upper housing, it can be expected that the body is less likely to be affected by a human body such as a finger during a call, and radiation loss due to the human body can be reduced.

[Brief description of drawings]

FIG. 1A is an inverted F according to a first embodiment of the present invention.
FIG. 3 is a plan view showing the configuration of the antenna unit 101,
(B) is a longitudinal cross-sectional view taken along the line AA ′ of (a).

2A is a graph showing frequency characteristics of a reflection coefficient S ₁₁ of the first antenna device in the inverted F type antenna device 101 of FIG. 1, and FIG. 2B is a graph showing FIG. 1A and FIG.
Is a graph showing a frequency characteristic of the reflection coefficient _{S 11} of the second antenna apparatus in the inverted F-type antenna apparatus 101 of (b), inverted F-type antenna (c) Fig. 1 (a) and FIG. 1 (b) 7 is a graph showing frequency characteristics of a reflection coefficient S ₁₁ when the first and second antenna devices are combined in the device 101.

FIG. 3A is an inverse F according to the second embodiment of the present invention.
FIG. 3 is a plan view showing the configuration of the antenna unit 102,
(B) is a vertical cross-sectional view taken along line BB 'of (a).

FIG. 4 is a vertical cross-sectional view showing a configuration of an inverted F-type antenna device 102a according to a first modification of the second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 102b according to a second modification of the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing the configuration of an inverted F type antenna device 102c according to a third modification of the second embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 102d according to a fourth modification of the second embodiment of the present invention.

FIG. 8A is an inverted F according to the third embodiment of the present invention.
FIG. 3 is a plan view showing the configuration of the type antenna device 103,
(B) is a longitudinal sectional view taken along the line CC 'of (a).

FIG. 9 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 103a according to a first modification of the third embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view showing a configuration of an inverted F type antenna device 103b according to a second modification of the third embodiment of the present invention.

FIG. 11 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 103c according to a third modification of the third embodiment of the present invention.

FIG. 12 is a vertical cross-sectional view showing a configuration of an inverted F-type antenna device 103d according to a fourth modification of the third embodiment of the present invention.

FIG. 13A is a plan view showing a configuration of an inverted F type antenna device 104 according to a fourth embodiment of the present invention,
(B) is a longitudinal sectional view taken along the line DD 'of (a).

FIG. 14A is a plan view showing the configuration of an inverted F type antenna device 105 according to a fifth embodiment of the present invention,
(B) is a longitudinal sectional view taken along line EE 'of (a).

FIG. 15A is a plan view showing the configuration of an inverted F-type antenna device 105a according to a modification of the fifth embodiment of the present invention, and FIG. 15B is a sectional view taken along line FF ′ of FIG. FIG.

FIG. 16A is a plan view showing the configuration of an inverted F type antenna device 106 according to a sixth embodiment of the present invention,
(B) is a longitudinal sectional view taken along the line GG 'in (a).

FIG. 17A is a plan view showing the configuration of an inverted F-type antenna device 106a according to a first modification of the sixth embodiment of the present invention, and FIG. 17B is a H-H of FIG. It is a longitudinal cross-sectional view about the line.

FIG. 18 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 106b according to a second modification of the sixth embodiment of the present invention.

FIG. 19 is a vertical cross-sectional view showing the configuration of an inverted F-type antenna device 106c according to a third modification of the sixth embodiment of the present invention.

FIG. 20A is a plan view showing a configuration of an inverted F type antenna device 107 according to a seventh embodiment of the present invention,
(B) is a plan view of the antenna element 12e of (a),
(C) is a plan view of the coupling element 13e of (a),
(D) is a top view of the coupling element 14e of (a).

FIG. 21 is a vertical cross-sectional view taken along the line II ′ of FIG.

22 is an inverse F shown in FIGS. 20 (a) and 21. FIG.
7 is a Smith chart showing frequency characteristics of input impedance of the pattern antenna device 107.

23 is an inverse F shown in FIGS. 20 (a) and 21. FIG.
7 is a graph showing frequency characteristics of a voltage standing wave ratio (VSWR) of the pattern antenna device 107.

FIG. 24 is an inverted F shown in FIGS. 20 (a) and 21.
It is a top view which shows the modification of the antenna element in the type | mold antenna apparatus 107, Comprising: The structure of the antenna element 12f which concerns on the 1st modification of 7th Embodiment.

FIG. 25 is a reverse F shown in FIGS.
Which is a modification of the coupling element in the antenna device 107 and is a coupling element 13 according to the second modification of the seventh embodiment.
It is a top view which shows the structure of f.

FIG. 26A is a plan view showing a configuration of an inverted F type antenna device 108 according to an eighth embodiment of the present invention,
(B) is a longitudinal cross-sectional view taken along line JJ 'of (a).

FIG. 27A is a plan view showing the configuration of a mobile wireless communication device 1101 according to a ninth embodiment of the present invention,
(B) is a side view of (a).

28A is a plan view showing a configuration of a mobile wireless communication device 1101a according to a modified example of the ninth embodiment of the present invention, and FIG. 28B is a side view of FIG. 28A.

29A is a partially cutaway plan view showing the configuration of a mobile wireless communication device 2100 according to a tenth embodiment of the present invention, and FIG. 29B is a side view of FIG. 29A.

FIG. 30A is a plan view showing the configuration of an internal antenna device 2200 according to the eleventh embodiment of the present invention,
(B) is a side view showing the configuration of the built-in antenna device 2200 of (a).

FIG. 31 (a) Portable radio communication device 1 according to prior art
It is a top view which shows the structure of 001, (b) is a dielectric substrate 1004 provided with the inverted F type antenna device 1005 of (a).
3 is a plan view showing the schematic configuration of FIG.

[Explanation of Codes] 101, 102, 102a, 102b, 102c, 10
2d, 103, 103a, 103b, 103c, 103
d, 104, 105, 105a, 106, 106a, 1
06b, 106c, 107, 108, ... Inverse F type antenna device, 11 ... Ground conductor, 12, 12a, 12b, 12c, 12d, 12e, 12
f, 12g, 12h ... Antenna element, 12s, 12es ... Slit, 13, 13a, 13b, 13c, 13e, 13f, 1
4, 14e ... Coupling element, 13s, 13es ... Slit, 21 ... Feeding conductor, 22 ... Shorting conductor, 23 ... Connection conductor, 25 ... Feeding point, 30 ... Feeding coaxial cable, 41, 42, 43 ... Dielectric substrate, 45, 46, 47 ... Dielectric material, 1101, 1101a, 2100 ... Portable wireless communication device, 1102 ... Upper housing, 1103 ... Lower housing, 1104 ... Hinge part, 1107 ... Whip antenna, 1108 ... Upper dielectric substrate, 1109 ... Lower dielectric substrate, 1110 ... Built-in antennas 2109, 2110 ... Connector, 2111 ... Feed point, 2200 ... Built-in antenna device, 2702a, 2703 ... Conductor pattern.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI theme code (reference) H04B 7/26 H04M 1/02 C H04M 1/02 H04B 7/26 V H04Q 7/32 Z (72) Invention Kenichi Yamada 4-3-1, Kojima-ku, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industry Co., Ltd. Inventor Koichi Ogawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Tsukasa Takahashi 4-3-1 Kojima, Kohoku-ku, Yokohama-shi Kanagawa Matsushita Communication Industrial Co. Reference) 5J045 AA01 AA02 AA06 AB05 DA08 HA06 MA04 NA01 5J046 AA01 AA02 AA04 AA07 AB13 PA07 5J047 AA01 AA02 AA04 AA07 AB13 FD01 5K023 AA07 LL05 5K067 AA21 BB04 EE02 KK0 1 KK17

Claims (22)

[Claims] 1. A ground conductor, an antenna element arranged on the ground conductor so as to face the ground conductor, and between the ground conductor and the antenna element, the ground conductor and the antenna element facing each other. And an at least one coupling element provided so as to provide a first connecting means for electrically connecting the antenna element and the ground conductor at at least one location. Antenna device. 2. The inverted F-type antenna device according to claim 1, wherein the ground conductor, the antenna element, and the coupling element are provided so as to be substantially parallel to each other. 3. The distance between the antenna element and the ground conductor at the end where the antenna element and the ground conductor are electrically connected by the first connecting means is set with respect to the end. To be different from the distance between the antenna element and the ground conductor at the other end on the opposite side,
The inverted F-type antenna device according to claim 1, wherein the antenna element and the connection conductor are provided. 4. The inverted F-type antenna device according to claim 3, wherein the coupling element is inclined with respect to the ground conductor. 5. The inverted F-type antenna device according to claim 1, wherein the antenna element has a shape that is bent along a shape of a housing that houses the inverted F-type antenna device. 6. The inverted F-type antenna device according to claim 1, wherein a part of at least one of the coupling element and the antenna element is bent and provided. 7. The inverted F-type antenna device according to claim 1, wherein a part of the ground conductor is provided by bending. 8. The total length of two different sides of the ground conductor corresponds to the lowest frequency band among frequency bands used in a portable wireless communication device using the inverted F-type antenna device. The inverse F according to any one of claims 1 to 7, characterized in that the wavelength is 1/4 or less of the selected wavelength.
Type antenna device. 9. The method according to claim 1, further comprising a second connecting means for electrically connecting the antenna element and the coupling element at at least one location. Inverted F-type antenna device according to item 1. 10. The connection point by the second connecting means is:
10. The inverted F-type antenna device according to claim 9, wherein the inverted F-type antenna device is arranged in the vicinity of a connection point of the first connecting means. 11. The constant current generated in the antenna element and the coupling element at the connection point of the second connecting means when the inverted F-type antenna device is excited by a radio signal having a predetermined wavelength. 11. The inverse of claim 10, wherein the dimensions of the antenna element and the coupling element are set so that the coupling element is located at the antinode of the standing wave and operates as a quarter-wave resonator. F-type antenna device. 12. The antenna element and the coupling element are:
The inverted F-type antenna device according to any one of claims 1 to 11, wherein the inverted F-type antenna device is electrically connected by a common feed conductor. 13. The antenna element and the coupling element are:
The inverted F-type antenna device according to any one of claims 1 to 11, wherein the inverted F-type antenna device is electrically connected by a common short-circuit conductor. 14. The method according to any one of claims 1 to 13.
The inverse F-type antenna device according to item 3, wherein the resonance frequency is adjusted by forming a slit in the antenna element. 15. The method according to any one of claims 1 to 13.
The resonance frequency of the inverted F-type antenna device according to item 1 is adjusted by forming a slit in the coupling element. 16. The method according to any one of claims 1 to 13.
The resonance frequency of the inverted F-type antenna device according to the third aspect is adjusted by forming a slot in the antenna element. 17. The method according to any one of claims 1 to 13.
The inverse F-type antenna device according to the third aspect, wherein the resonance frequency is adjusted by forming a slot in the coupling element. 18. The electromagnetic field coupling amount between the antenna element and the ground conductor is adjusted by changing the area of at least one of the antenna element and the coupling element. Any one of 17
Inverted F-type antenna device according to item 1. 19. The inverted F-type antenna device according to claim 1, wherein a part or the whole of the inside of the inverted F-type antenna device is filled with a dielectric. F-type antenna device. 20. The inverse F according to claim 1, wherein dimensions of the antenna element and the coupling element are set so as to resonate in a plurality of frequency bands.
Type antenna device. 21. A portable wireless communication device comprising: an upper housing, a lower housing, and a hinge portion connecting the upper housing and the lower housing. 1
7. The portable wireless communication device, wherein the inverted F-type antenna device according to item 1 is provided inside the upper housing. 22. The portable wireless communication device according to claim 21, further comprising a monopole antenna.