JPH1155148A - Portable wireless devices - Google Patents

Abstract

(57) Abstract: Provided is a portable wireless device in which deterioration of antenna radiation characteristics due to the presence of a battery is suppressed. A low frequency circuit unit is provided on a dielectric substrate.
And a high-frequency circuit section 103, an antenna 104 is connected to the high-frequency circuit section 103, and the circuit sections 102 and 1
In the portable wireless device using the battery 105 as the power source 03, the conductive portion 108 of the battery 105 and the ground portion 109 on the substrate 101 are each formed of a metal film, and both are electrically connected by surface contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio device such as a portable telephone or a portable information terminal using a battery as a power source.
In particular, the present invention relates to a portable wireless device configured to obtain good antenna radiation characteristics without deterioration of a radiation pattern due to the presence of a battery.

[0002]

2. Description of the Related Art It is generally difficult to predict the radiation characteristics of an antenna in a portable radio device such as a portable telephone. This is because unnecessary radiation due to high-frequency current flowing through the metal part of the housing or the substrate of the portable wireless device cannot be ignored. For example, in a mobile phone, an antenna, a housing,
The radiation characteristics of the antenna may vary greatly depending on the size of the battery, the substrate, and the like.

FIG. 14 shows an example of a conventional portable radio apparatus. A low-frequency circuit unit 202 and a high-frequency circuit unit 203 mainly composed of an integrated circuit are mounted on both surfaces of a substrate 201, and an antenna 204 for transmission and reception is connected to the high-frequency circuit unit 203. A low-frequency circuit section 202 is located at a distance of about several mm from the surface of the substrate 201.
A battery 205 serving as a power supply for the high-frequency circuit unit 203 is provided, and is connected to a power supply terminal on the board 201 by a planar connector 206.

FIG. 15 shows a radiation pattern (also referred to as a directivity pattern) of the antenna 204 in the portable radio apparatus shown in FIG. When the direction of the antenna 204 viewed from the feeding point P is z and the direction of the battery 205 viewed from the substrate 201 is y as shown on the right side of FIG.
It is a pattern of the electric field of a component. Substrate 2 as described above
Since the total length of the antenna 01 and the antenna 204 is slightly longer than the half-wavelength, the radiation pattern of the antenna 204 is expected to be a figure-eight shape close to that of the half-wavelength dipole antenna. As shown in FIG. 15, the radiated electric field level drops in the y direction, that is, the direction in which the battery 205 exists.

The cause of such a drop in the antenna radiation pattern is considered to be as follows. FIGS. 16A and 16B
16 shows the distribution of the amplitude and phase of the current on the dashed-dotted plane of the substrate 201 and the antenna 204 shown in FIG.

[0006] As shown in FIG.
Looking at the current amplitude at the battery mounting portion 207 in (c), it is larger than the current amplitude on the antenna 204. This is because the substrate 201 and the battery 205 in the battery
High frequency resonance current due to the capacitance between the
It seems to be caused by flowing above. On the other hand, as shown in FIG. 16B, looking at the current phases on the substrate 201 and the antenna 204, the current phases in the battery mounting portion 207 are opposite to the current phases on the antenna 204.

As described above, the substrate 201 of the battery mounting portion 207
On the upper side, a high-frequency current having an amplitude larger than that of the current on the antenna 204 and having a phase opposite to that of the current flows, and unnecessary radiation due to this current acts to cancel the original radiation from the antenna 204. It is considered that the electric field level of the antenna radiation pattern drops as shown in FIG. That is, it is considered that the deterioration of the antenna radiation pattern is caused by the fact that the battery mounting portion 207 functions as a high-frequency resonance circuit and changes the current distribution on the substrate 201 as described above.

[0008] The above-described power supply state of the resonance circuit can be easily considered assuming that the resonance circuit operates as an antenna. That is, it is considered that a current is generated on the resonance circuit due to electromagnetic coupling between the monopole antenna as the antenna 204 and the resonance circuit (here, operating like an antenna) formed by the battery mounting unit 207.

[0009] In this case, the antenna formed by the resonance circuit may be a "one-side short-circuit type microstrip antenna" in which one side of the radiation plate of the microstrip antenna is connected to the ground plate, or a monopole antenna may have an inverted L shape. "Plate-shaped inverted-L antenna" bent into a plate shape
Can be considered as working.

Here, a single-side short-circuit type microstrip antenna and a plate-shaped inverted L antenna will be briefly described for reference. First, a one-side short-circuit type microstrip antenna will be described with reference to FIG. FIG. 17A is a schematic configuration of a one-side short-circuit type microstrip antenna. In the case of the microstrip antenna having the basic shape shown in FIG. 17B, the length d of the radiation plate 300 is n · λ /
2 (an integer multiple of half the wavelength at the operating frequency), the electric field becomes zero at the center of the radiation plate. Therefore, even if the radiation plate 301 is short-circuited with the ground plate 302 at the center as shown in FIG. 17A, the electric field distribution does not change. As a result, the length of the radiation plate 301 of the radiation plate 3 of the microstrip antenna having the basic shape shown in FIG.
N · λ / 4 (n is an arbitrary integer, λ is the wavelength at the used frequency) which is d / 2 with respect to the length d of 00, that is, an integer multiple of a quarter wavelength at the used frequency.

Next, the inverted L antenna 4 shown in FIG.
In the case of 00, the length of the L-shaped portion is d / 2, that is, n · λ /
When it becomes the same as 4, resonance occurs. On the other hand, FIG.
In a plate-shaped inverted-L antenna composed of a plate-shaped element 401 and an arm 402 as shown in FIG.
2+ (the length of the arm portion 402) is d / 2, that is, n · λ
Resonates at / 4. In the inverted inverted L antenna, resonance occurs due to strong distribution of current on the periphery of the plate element 401.

[0012]

As described above, in the conventional portable wireless device, an unexpected electric field level drop of the antenna radiation pattern occurs in the direction of the battery due to the resonance of the current in the battery mounting portion, and the antenna radiation characteristic is reduced. There is a problem that it deteriorates. An object of the present invention is to provide a portable wireless device that can solve such a problem and suppress deterioration of antenna radiation characteristics due to the presence of a battery.

[0013]

In order to solve the above problems, the present invention provides a circuit section on a dielectric substrate, connects an antenna to the circuit section, and uses a battery as a power supply for the circuit section. A portable wireless device is characterized in that a conductive portion of a battery is electrically connected to a ground portion on a substrate by surface contact. More specifically, for example, the conductive portion of the battery and the ground portion on the substrate are formed of a metal film by plating, vapor deposition, or the like, and both are electrically connected by surface contact.

When the conductive portion of the battery and the ground portion on the substrate are electrically connected as described above, a high-frequency resonance circuit is not formed between them, and a high-frequency resonance current is applied to the substrate. Does not flow. Therefore, unnecessary radiation due to the high-frequency resonance current is eliminated or reduced, so that the electric field level does not drop in the original radiation direction and the original radiation pattern of the antenna is not damaged. And good antenna radiation characteristics.

Further, another portable wireless device according to the present invention comprises:
The antenna is mounted on the dielectric substrate, a metal shield member electrically connected to a ground portion on the substrate is provided on the substrate, and a battery is provided in the metal shield member.

[0016] Even in such a configuration, the conductive portion of the battery is electrically connected to the ground portion on the substrate by surface contact via the metal shield member, and the same result as described above can be obtained.

According to still another portable radio device of the present invention, the battery has a rectangular parallelepiped shape, is arranged so that one surface is parallel to the substrate in proximity to the substrate, and the length of one side of the surface parallel to the substrate is set. Is almost a quarter wavelength or more at the operating frequency,
The battery is characterized in that a conductive portion is electrically connected to a ground portion on the substrate at at least one point.

In another portable radio device according to the present invention, the battery has a rectangular parallelepiped shape, is arranged so that one surface is parallel to the substrate, close to the substrate, and is arranged on one side of the surface parallel to the substrate. It has a plurality of electrode terminals, the distance from the electrode terminal to the other opposite side is almost an integral multiple of a quarter wavelength at the operating frequency, and the conductive part of this battery is connected to the ground part on the substrate by the electrode terminal. And electrically connected at least at one of the positions closer to the other side.

Still another portable radio device according to the present invention is such that the battery has a rectangular parallelepiped shape, is arranged near the substrate so that one surface is parallel to the substrate, and is provided on one side of the surface parallel to the substrate. The electrode terminal extends substantially perpendicularly to the substrate and is connected to the substrate, and the sum of a half of the perimeter of the battery and the length of the electrode terminal is substantially an integral multiple of a quarter wavelength at the operating frequency, The battery is characterized in that a conductive portion is electrically connected to a ground portion on the substrate at at least one point on a peripheral portion excluding the positions of the electrode terminals.

By electrically connecting the conductor portion on the battery surface and the ground portion on the substrate at at least one point as described above, the function of a high-frequency resonance circuit formed therebetween is suppressed, and this resonance It is possible to reduce the current on the substrate induced by the circuit and to realize good antenna radiation characteristics.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a schematic configuration of a portable radio apparatus according to a first embodiment of the present invention. Dielectric substrate 101
A low-frequency circuit unit 102 is formed on one surface of the device, and a high-frequency circuit unit 103 is formed on the other surface.
3 is connected to an antenna 104. Low frequency circuit 1
02 and the high-frequency circuit unit 103 are mainly configured by an integrated circuit.

In this example, a linear monopole antenna is used as the antenna 104. Here, the substrate 101
The total length of the antenna and the antenna 104 is set slightly longer than a half wavelength, and the antenna 101 is ideally
By operating together with 01, the operation is almost the same as that of a half-wave dipole antenna.

Taking the case of a mobile phone as an example, first, at the time of transmission, a user's voice input through a transmitter (not shown) is transmitted through a low-frequency circuit section 102 and a high-frequency circuit section 103.
After being modulated into a high-frequency signal of a predetermined frequency,
It is radiated from the antenna 104 as radio waves. On the other hand, at the time of reception, a signal received by the antenna 104 is converted into a predetermined intermediate frequency by the high frequency circuit section 103, supplied to the low frequency circuit section 102, and output as voice from a receiver (not shown).

A battery 105 is further mounted on the substrate 101 by a detaching mechanism (not shown). Battery 105
Is, for example, a lithium ion battery or another secondary battery, and its positive terminal 106 and negative terminal 107 are connected to positive and negative electrode terminals (not shown) on the device side with the battery 105 mounted on the substrate 201. This electrode terminal is connected to the low-frequency circuit unit 102, and the output of the battery 105 is subjected to processing such as stabilization, step-up or step-down in the low-frequency circuit unit 102, and then to the low-frequency circuit unit 102 and the high-frequency circuit unit 10.
3 is supplied as power to necessary parts.

2 (a) and 2 (b)
A conductive portion 108 is formed as shown in FIG. The conductive portion 108 is a metal film formed on the case of the battery 105 by plating, vapor deposition, sputtering, or the like. When the battery 105 is mounted on the substrate 101, plating, vapor deposition, sputtering, or the like is similarly performed on the substrate 101. Is electrically connected to a ground surface 109 made of a metal film formed by the above-described method. Here, FIG. 2A shows an example in which the ground surface 109 of the substrate 101 is formed on the entire surface facing the bottom surface of the battery 105, and FIG.
5 is an example in which it is formed in a ring shape only at a position facing the outer peripheral portion of the bottom surface, and any of these may be used.

The conductive portion 108 of the battery 105
May be a part of the shield member, or may be electrically connected to the shield member. Further, the conductive portion 108 may be electrically connected to the negative electrode terminal 107 inside the battery 105.

The above-mentioned attachment / detachment mechanism for detachably mounting the battery 105 on the substrate 101 is such that the conductive portion 108 can be pressed against the ground surface 109 of the substrate 101 with a sufficient force when the battery 105 is mounted. 105 to substrate 1
It is desirable to have a pressing mechanism that presses toward the 01 side. As the attachment / detachment mechanism, a mechanism using a screw may be used. When the battery 105 is of a fixed type, the conductive portion 108 of the battery 105 may be fixed to the ground surface 109 of the battery 105 by soldering.

FIG. 3 shows an antenna radiation pattern in the portable wireless device of this embodiment. This is, as shown in FIG. 4, the pattern of the electric field of the E 2 component on the zy plane when the direction of the antenna 104 as viewed from the feeding point P is z and the direction of the battery 105 as viewed from the substrate 101 is y. It is.

As described above, in this embodiment, the substrate 10
The total length of the antenna 1 and the antenna 104 is set to be slightly longer than a half wavelength, and the antenna 104 is designed to function as a half-wave dipole antenna. As is clear from FIG. , A figure-shaped pattern close to that of a half-wavelength dipole antenna. That is, according to the present embodiment, there is no drop in the electric field level due to the presence of the battery as seen in the antenna radiation pattern shown in FIG. 9 of the conventional portable wireless device, and good radiation characteristics are obtained.

The reason why such good antenna radiation characteristics can be obtained will be described with reference to FIG. FIG. 5 (a)
FIG. 5B shows the substrate 101 and the antenna 104 in FIG.
The distribution of the amplitude and the phase of the current on the one-dot chain line shown in (c) is shown.

As shown in FIG. 5A, the current amplitude on the substrate 101 on the right side of the drawing from the feeding point P is smaller than the current amplitude on the antenna 104 on the left side of the drawing from the feeding point P. A phenomenon in which the current amplitude in the battery mounting portion increases unlike the related art is not seen. In the present embodiment, the conductive portion 108 of the battery 105 is electrically connected to the ground surface 109 of the substrate 101 by surface contact, and a high-frequency resonance circuit is not formed between the two as in the related art. It is thought that it is because it does not flow. On the other hand, as shown in FIG. 5B, the current phase on the substrate 101 is different from the current phase on the antenna 104 by about 80 °, and is reversed like the conventional characteristic shown in FIG. As a result, no dip in the electric field occurs in the antenna radiation pattern.

Therefore, in the portable radio apparatus according to the present embodiment, since there is almost no unnecessary radiation due to the current on the substrate 101 which is in the opposite phase to the current on the antenna 104, the antenna radiation pattern is And a good figure-of-eight pattern as shown in FIG. 3 is obtained.

Next, another embodiment of the present invention will be described.
In the following embodiments, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description will focus on differences from the first embodiment.

(Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
1 shows a schematic configuration of a portable wireless device according to the embodiment. In the present embodiment, a box-shaped metal shield member 110 electrically connected to a ground portion on the dielectric substrate 101 is provided, and a battery is provided inside the metal shield member 110 such that a conductive portion is in close contact with the metal shield member 110. 105 is arranged. The metal shield member 110 can be opened and closed by a hinge or the like (not shown), and the battery 105 is detachable.

With such a configuration, the conductive portion of the battery 105 is connected to the ground portion on the substrate 101 by the metal shield member 1.
10 are electrically connected to each other, and the same effects as in the previous embodiment can be obtained.

Although only the battery 105 is incorporated in the metal shield member 110 in FIG. 6, at least one of the low-frequency circuit section 102 and the high-frequency circuit section 103 may be incorporated together with the battery 105. Further, the shape of the metal shield member 110 is not limited to a rectangular shape as illustrated, but may be a polygonal shape, a cylindrical shape, or the like. Further, the metal shield member 110 does not necessarily need to be openable and closable.

(Third Embodiment) FIG. 7 shows a second embodiment of the present invention.
FIG. 8 shows a schematic configuration of a portable wireless device according to the embodiment of FIG.
(A) and (b) show a plan view and a sectional view thereof.

In the present embodiment, a rectangular parallelepiped battery 105 is used.
Is arranged close to the dielectric substrate 101 so that the substrate 101 and one surface thereof are parallel to each other, and each side has a length of a quarter wavelength or more at the operating frequency.

Then, for example, a pin-shaped grounding terminal 11 is connected to a conductive portion 108 formed on the bottom surface of the battery 105, that is, the surface facing the dielectric substrate 101 as shown in FIG.
1 and the ground terminal 111 is connected to the substrate 10
1 is electrically connected to the ground surface 109 at a position other than the electrode terminals 106 and 107. In FIG. 7, the ground terminal 111 is provided only at one point, but may be provided at a plurality of points. That is, the conductive portion 10 of the battery 105
8 is connected to the ground plane 109 at at least one point.

With such a configuration, the same effects as those of the above embodiments can be obtained. (Fourth Embodiment) FIGS. 9A and 9B show a fourth embodiment of the present invention.
1A and 1B are a plan view and a cross-sectional view of a portable wireless device according to an embodiment. This embodiment is an example in which the battery 105 operates as a one-side short-circuit type microstrip antenna.

That is, in this embodiment, the rectangular parallelepiped battery 105 is arranged close to the dielectric substrate 101 so that the bottom surface of the battery 105 is parallel to the dielectric substrate 101, and one side thereof (in this example, the low-frequency circuit section 102 and the high-frequency circuit section 102). A plurality of electrode terminals 120 are linearly arranged on the side surface (the side opposite to the side on which the circuit portion 103 is mounted). From the side on which the electrode terminals 120 of the battery 105 are arranged, to the opposite side (in this example, the low-frequency circuit section 102 and the high-frequency circuit section 10
3 is substantially n · λ /
4 (n is an arbitrary integer, λ is the wavelength at the used frequency),
That is, it is almost an integral multiple of a quarter wavelength at the used frequency.

A pin-shaped grounding terminal 121 is connected to one end of the conductive portion 108 formed on the bottom surface of the battery 105.
1 is electrically connected to the ground surface 109 at a position other than the electrode terminal 120. In the present embodiment, the ground terminal 121 is provided only at one point, but may be provided at a plurality of points. That is, the conductive portion 108 of the battery 105
Is a position in a region shown by oblique lines in FIG. 9A, specifically,
At least one point is connected to the ground surface 109 at a position closer to a side opposite to the side where the electrode terminals 120 of the battery 105 are arranged.

Next, the effect of this embodiment will be described based on computer simulation. FIG. 10 shows a simulation model of the portable wireless device of the present embodiment. Using this model, the connection positions of the grounding terminals 121 on the conductive portion 108 of the battery 105 are determined at points A, B, C, D, and E.
The radiation pattern was simulated by variously changing as follows. Here, A, B, C, D, and E are determined according to the arrangement of the portable wireless device according to the present embodiment. As in the first embodiment, the portable wireless device of the present embodiment is designed so that the radiation pattern is equivalent to that of a half-wave dipole antenna.

FIGS. 11A, 11B, 11C and 11D.
Indicates the connection positions of the grounding terminals 121 at points A, B, C, D,
E is a simulation result of the antenna radiation pattern of the portable wireless device of the present embodiment when E is set, and z is the direction of the antenna 104 viewed from the feeding point P, and y is the direction of the battery 105 viewed from the substrate 101. It is a pattern of the electric field of E component in a zy plane. As is clear from FIG. 11, even if the position of the grounding terminal 121 changes, the antenna 1
04 has an 8-shaped pattern similar to that of a half-wave dipole antenna as designed.

That is, according to the present embodiment, there is no drop in the electric field level due to the presence of the battery as seen in the antenna radiation pattern shown in FIG. 9 of the conventional portable radio apparatus, and good radiation characteristics can be obtained. I understand.

Next, the reason why good antenna radiation characteristics can be obtained by the configuration of this embodiment will be described. As described with reference to FIG.
Assuming that the resonance circuit 5 operates as an antenna, this antenna can be regarded as, for example, a one-side short-circuit type microstrip antenna in which one side of a radiation plate of a microstrip antenna is connected to a ground plane. When considered as a one-side short-circuit type microstrip antenna, it is considered that resonance is generated due to a large distribution of current between the radiation plate and the substrate. As one method of suppressing such resonance, a method is considered in which a conductor is inserted into a portion where the current is large to change the current distribution and shift the resonance frequency.

In this embodiment, since the plurality of electrode terminals 120 are linearly arranged on one side of the battery 105, the battery 105 functions as a one-sided short-circuited microstrip antenna. Of the substrate 10 via the ground terminal 121
It is considered that by electrically connecting to the ground plane 109 on the first side, the resonance of the portion of the battery 105 was suppressed by the same effect as the above-described method, and unnecessary current due to the resonance was reduced.

As described above, in the portable radio apparatus according to the present embodiment, unnecessary radiation due to the current on the substrate 101 having a phase opposite to that of the current on the antenna 104 hardly occurs. The change from the original radiation pattern due to the current becomes small, and a good figure-eight pattern as shown in FIG. 11 can be obtained.

FIGS. 12A and 12B show FIGS. 5 and 16 respectively.
5C of the substrate 101 and the antenna 104 in the same manner as in FIG.
3 shows the distribution of the amplitude and phase of the current on the dashed-dotted line shown in FIG.

As shown in FIG. 12A, the feeding point P
The amplitude of the current on the substrate 101 on the right side in FIG.
From the figure, the amplitude of the current on the antenna 104 on the left side in the figure is smaller than that of FIG. On the other hand, as shown in FIG.
This is a difference of about 80 ° with respect to the phase of the current on the reference numeral 04, and has not yet reached the point of reversal as in the conventional characteristic shown in FIG. As described above, the decrease in the phase difference between the current phase on the substrate 101 and the current phase on the antenna 104 also shows a tendency to suppress interference of the current on the substrate 101 with the antenna radiation pattern.

(Fifth Embodiment) FIGS. 13A and 13B
FIG. 7 shows a plan view and a cross-sectional view of a portable wireless device according to a fourth embodiment of the present invention. This embodiment is an example in which the battery 105 functions as a plate-shaped inverted L antenna. That is, in the present embodiment, the rectangular parallelepiped battery 105 is disposed close to the dielectric substrate 101 so that the bottom surface of the battery 105 is parallel to the substrate 101, and one side thereof (in this example, the low-frequency circuit portion 102 and the high-frequency circuit portion 103). The electrode terminal 130 is connected to the side surface (the side opposite to the side on which is mounted). Here, the electrode terminals 130 extend substantially perpendicular to the dielectric substrate 101 and are connected to the substrate 101.

Further, the peripheral length of the battery 105 (a + b) ×
2 (a + b) and the sum of the length c of the electrode terminal 130 and the sum (a + b + c) (the length of the hatched portion in FIG. 13A) is substantially n · λ / 4 (4 at the operating frequency). (Approximately an integral multiple of a fraction of a wavelength).

The conductive portion 108 formed on the bottom surface of the battery 105 is provided with a pin-shaped grounding terminal 131 having one end connected thereto.
1 is electrically connected to the ground surface 109 at a peripheral position excluding the electrode terminal 130. In this embodiment, the ground terminal 131 is provided only at one point, but may be provided at a plurality of points. That is, the conductive portion 108 of the battery 105 is connected to the ground surface 109 at at least one point in a position (a position on the peripheral portion of the bottom surface of the battery 105) in a region indicated by oblique lines in FIG.

With such a configuration, the battery 105 forms a plate-shaped inverted L antenna with the electrode terminal 130 and the conductive portion 108, and is formed on the periphery of the conductive portion 108 as a plate-like element (FIG. 13A).
It is considered that the resonance is generated by the large distribution of the current in the shaded area of FIG. Therefore, similarly to the fourth embodiment, the portion where the current is large, that is, the conductive portion 1 of the battery 105
By disposing the grounding terminal 131 around the periphery of 08 to change the current distribution and shift the resonance frequency, unnecessary current distribution on the resonance circuit can be reduced.

As described above, also in this embodiment, the resonance frequency is suppressed, and unnecessary current distribution by the battery 105 is reduced, so that the electric field level does not drop in the original radiation direction. Therefore, since the original radiation pattern of the antenna is not impaired, good antenna radiation characteristics can be realized.

The present invention is not limited to the above embodiment, but can be variously modified as follows. The present invention is not limited to the above embodiment, and can be implemented with various modifications as follows. For example, in the above embodiment, a monopole antenna is used as an antenna, but a loop antenna, an inverted F-type antenna, or the like can be used, and the shape and form are not particularly limited.

In the above embodiment, the low-frequency circuit section and the high-frequency circuit section are arranged separately on both sides of the substrate. However, the low-frequency circuit section and the high-frequency circuit section are provided on the surface opposite to the side where the battery is mounted. May be arranged. In this case, a large battery having the same vertical and horizontal dimensions as the substrate can be used as the battery.

Further, in the above embodiment, the dielectric substrate is 1
Although a single substrate is used, a plurality of dielectric substrates can be used, and they can be connected by a connection method equivalent to that of a battery. That is, connection terminals are required even between a plurality of substrates, and a high-frequency resonance circuit may be formed here. Also in this case, the battery is disposed on a second dielectric substrate different from the first dielectric substrate on which the circuit portion is formed, and the conductive portion of the battery is brought into surface contact with a ground portion on the substrate or at least at one point. What is necessary is just to connect electrically.

In the above embodiment, the shape of the dielectric substrate is a rectangle that is long in the direction of the antenna. However, the shape may be a rectangle that is short in the direction of the antenna, a polygon, a circle, or the like. The dielectric substrate may have a block shape having a certain thickness, and is not limited to a plate shape.

In the above embodiment, the shape of the dielectric substrate is a rectangle that is long in the direction of the antenna, but may be a rectangle that is short in the direction of the antenna. The dielectric substrate may be in the form of a block having a certain thickness, and is not limited to a plate.

In the present invention, the wavelength (λ) to be used is considered to be λ _eff represented by the following equation when the wavelength shortening effect of the dielectric is taken into consideration. λ _eff = c / ｛f (ε _r ) ^1/2 λ λ _eff : wavelength c: speed of light f: operating frequency ε _r : relative permittivity

[0062]

As described above, according to the present invention, the conductive portion of the battery and the ground portion on the substrate are electrically connected by surface contact, for example, both are formed by a metal film, or By electrically connecting the conductive portion to the ground portion on the substrate via a metal shield member by surface contact, or by connecting at least one point to the ground portion on the substrate, a large high-frequency resonant current flows between the substrate and the battery. Thus, it is possible to provide a portable wireless device capable of preventing unnecessary radiation by preventing the flow of radio waves and suppressing a drop in an antenna radiation pattern to obtain favorable radiation characteristics.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a portable wireless device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view for explaining a method of connecting a ground portion on the substrate and a conductive portion of the battery in the embodiment.

FIG. 3 is a diagram showing an antenna radiation pattern in the embodiment.

FIG. 4 is an exemplary view for explaining how to view an antenna radiation pattern in the embodiment.

FIG. 5 is a view showing distribution of current amplitude and current phase on a substrate and an antenna in the embodiment.

FIG. 6 is a perspective view showing a schematic configuration of a portable wireless device according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a schematic configuration of a portable wireless device according to a third embodiment of the present invention.

FIG. 8 is a plan view and a cross-sectional view of the portable wireless device according to the embodiment;

FIG. 9 is a plan view and a cross-sectional view of a portable wireless device according to a fourth embodiment of the present invention.

FIG. 10 is a view showing an analysis model of the portable wireless device according to the embodiment;

FIG. 11 is a view showing an antenna radiation pattern according to the embodiment;

FIG. 12 is a view showing distribution of current amplitude and current phase on a substrate and an antenna in the same embodiment.

FIG. 13 is a plan view and a cross-sectional view of a portable wireless device according to a fifth embodiment of the present invention.

FIG. 14 is a perspective view showing a schematic configuration of a conventional portable wireless device.

FIG. 15 is a diagram showing an antenna radiation pattern in a conventional portable wireless device.

FIG. 16 is a diagram showing distribution of current amplitude and current phase on a substrate and an antenna in a conventional portable wireless device.

FIG. 17 is an explanatory diagram of a one-side short-circuited microstrip antenna.

FIG. 18 is an explanatory view of a plate-shaped inverted L antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Dielectric substrate 102 ... Low frequency circuit part 103 ... High frequency circuit part 104 ... Antenna 105 ... Battery 106 ... Positive terminal 107 ... Negative terminal 108 ... Conductive part of battery 109 ... Ground plane of substrate 110 ... Metal shield member 111 ... Ground Terminal 120: Electrode terminal 121: Ground terminal 130: Electrode terminal 131: Ground terminal

Claims (6)

[Claims] 1. A portable wireless device using a battery as a power source for a circuit portion, wherein a circuit portion is provided on a dielectric substrate, an antenna is connected to the circuit portion, and a conductive portion of the battery is mounted on the substrate. A portable wireless device electrically connected to a ground portion by surface contact. 2. A portable wireless device using a battery as a power source for a circuit portion, wherein a circuit portion is provided on a dielectric substrate, an antenna is connected to the circuit portion, and a conductive portion of the battery and the A portable wireless device in which a ground portion is formed by a metal film and both are electrically connected by surface contact. 3. A dielectric substrate, an antenna mounted on the substrate, a metal shield member provided on the substrate and electrically connected to a ground portion on the substrate, A portable wireless device, comprising a battery provided. 4. A portable wireless device using a circuit provided on a dielectric substrate, connecting an antenna to the circuit, and using a battery as a power source for the circuit, wherein the battery has a rectangular parallelepiped shape. Is disposed so that one surface is parallel to the substrate, and the length of one side of the surface parallel to the substrate is substantially equal to or longer than a quarter wavelength at the operating frequency. Is electrically connected at least at one point to a ground portion on the substrate. 5. A portable wireless device using a battery as a power source for a circuit section, wherein a circuit section is provided on a dielectric substrate, an antenna is connected to the circuit section, and the battery section has a rectangular parallelepiped shape. A plurality of electrode terminals arranged on a side surface of one side of a surface parallel to the substrate, one surface being arranged in parallel with the substrate in close proximity to the other substrate facing the electrode terminals. The distance to one side is substantially an integer multiple of a quarter wavelength at the operating frequency, and the conductive part of the battery is further grounded on the substrate at at least one point closer to the other side from the electrode terminal to the ground. A portable wireless device which is electrically connected. 6. A portable radio apparatus using a battery as a power source for a circuit section, wherein the circuit section is provided on a dielectric substrate, an antenna is connected to the circuit section, and the battery section has a rectangular parallelepiped shape. The electrode terminals provided on one side surface of a side parallel to the substrate extend substantially perpendicular to the substrate and are connected to the substrate in such a manner that one surface is parallel to the substrate. The sum of a half of the perimeter of the battery and the length of the electrode terminal is substantially an integral multiple of a quarter wavelength at the operating frequency, and the conductive part of the battery is connected to a ground part on the substrate. A portable wireless device characterized in that it is electrically connected at at least one point on the periphery except for the positions of the electrode terminals.