JP4923129B2 - Wireless device - Google Patents

Description

The present invention relates to a wireless device, and more particularly to a wireless device configured by connecting two housings so as to be openable and closable.

In recent years, wireless communication has been applied in a very wide range of fields. For example, the number and applications of wireless devices typified by mobile phones are steadily expanding. A recent trend that should be particularly noted is the widespread use of wireless devices, such as the reception of terrestrial digital television broadcasts and support for short-range wireless links, in addition to conventional voice and data communications. As a result, there has been a demand for further broadbandization of wireless devices, and this trend is expected to become stronger with the development of UWB (Ultra-Wide Band) technology.

In order to realize a wide band of a wireless device, it is necessary to increase the bandwidth of each component of the wireless device, and in particular, the broadband of an antenna is an urgent issue. When using a narrow band type antenna as used in a conventional mobile phone as it is, it is necessary to provide an antenna for each application, resulting in a complicated circuit configuration and an increase in the size of the device. In addition, whip antennas commonly used in mobile phones have a structure protruding outside the housing, which hinders improvements in the size, thickness, and ease of handling of wireless devices.

On the other hand, a conventional technique using a plate-like conductor (such as a pattern of a built-in substrate) built in a housing of a wireless device as an antenna element is known (see, for example, Patent Document 1 or Non-Patent Document 1). The prior art disclosed in these documents operates as a dipole antenna with a pair of an upper antenna element built in the upper housing of a so-called foldable mobile phone and a lower antenna element built in the lower housing. The radiation directivity in various usage situations is controlled by variations in the shape of the element and the connection between the elements.

However, even with the above-described conventional technology, there is a problem in that thinning is limited because the upper antenna element and the ground plane (for example, the ground pattern of the built-in substrate) need to be provided inside the upper casing. . Moreover, it is necessary to perform balanced feeding as a dipole antenna, and there is a problem that the feeding system between the radio unit having an unbalanced output is generally complicated.

JP 2004-56426 A (2nd, 4th to 6th pages, FIG. 1)

Nishikido, Saito, Haruki, Koyanagi, Egawa “Parallel 2-element distributed feed antenna for portable wireless devices”, 2003 IEICE Communication Society Proposal B-1-190

As described above, the conventional wireless device using the built-in antenna has a problem that the thinning of the device and the simplification of the feeding system are limited.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless device capable of realizing a thin casing using a built-in antenna suitable for wide band.

In order to achieve the above object, a wireless device of the present invention includes a first housing, a second housing, and a connecting portion that connects the first housing and the second housing so as to be openable and closable. And a feed line consisting of a signal line and a return line, the feed line serving as a feed point for a radio frequency signal belonging to the band in which the termination is used, and having a first ground pattern, and being built in the first casing, The first ground pattern has a first substrate having a first connection point connected to the signal line side of the feeding point, and a second ground pattern on the second casing. The second grounding pattern is mounted on the second substrate, the second substrate having a second connection point connected to the return line side of the feeding point,
And a wireless unit to which a starting end of the feed line is connected.

According to the present invention, since the ground pattern of the board built in the housing is used as an antenna element, the current path from the connection point to the end of each board is divided into a plurality of parts and unbalanced power feeding is performed. Can be used to achieve a wider bandwidth and a thinner profile.

The figure showing the structure of the radio | wireless apparatus which concerns on Example 1 of this invention. FIG. 3 is a diagram illustrating an example of power feeding system connection of the wireless device according to the first embodiment. FIG. 3 is a diagram schematically illustrating a distribution of antenna current paths according to the first embodiment. FIG. 6 is a diagram illustrating another example of power feeding system connection according to the first embodiment. The figure which represents typically the application example of the electric power feeding system connection represented by FIG. The figure showing an example of the electric power feeding system connection of the radio | wireless apparatus which concerns on Example 2 of this invention. FIG. 10 is a diagram illustrating another example of power feeding system connection according to the second embodiment. The figure showing an example of the electric power feeding system connection of the radio | wireless apparatus which concerns on Example 3 of this invention. FIG. 12 is a diagram illustrating another example of power feeding system connection according to the third embodiment. The figure which represents typically an example of arrangement | positioning and the electric power feeding system connection of the radio | wireless part of the radio | wireless apparatus which concern on Example 4 of this invention. The figure showing an example of the electric power feeding system connection represented by FIG. The figure showing the structure of the radio | wireless apparatus which concerns on Example 5 of this invention. The figure showing the structure of the radio | wireless apparatus represented by FIG. 12 from the side surface in a closed state. The figure showing the positional relationship of the connection point represented by FIG. FIG. 10 is a diagram schematically illustrating an antenna current distribution according to the fifth embodiment. FIG. 10 is a diagram illustrating an example of an arrangement of a power feeding system according to a fifth embodiment. The figure showing an example of the antenna VSWR characteristic by the connection represented by FIG. The figure showing an example of the antenna VSWR characteristic by shortest distance connection other than having represented in FIG. The figure showing the structure of the radio | wireless apparatus which concerns on Example 6 of this invention. The figure showing the structure of the radio | wireless apparatus represented by FIG. 19 from the side surface in a closed state.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating a main configuration of a radio apparatus according to Embodiment 1 of the present invention. 1 in the figure is the wireless device.

The wireless device 1 is configured such that an A casing 11 and a B casing 12 are connected via a connecting portion 13 so as to be opened and closed. The A casing 11 has a built-in A substrate 14, and the A substrate 14 has an A grounding pattern 15.
Is provided. The B housing 12 includes a B substrate 16, and the B substrate 16 has a B ground pattern 1.
7 is provided. In FIG. 1, the A casing 11 and the B casing 12 can be opened and closed by mutually rotating around one rotation axis parallel to the longitudinal direction of the connecting portion 13. In some cases, the opposite surfaces of the A casing 11 and the B casing 12 are interchanged so as to be closed.

Here, the A ground pattern 15 is formed using, for example, the ground layer of the A substrate 14 configured as a multilayer substrate, but may be provided on the component mounting surface or the signal line wiring surface of the multilayer or single layer substrate.
The same applies to the B ground pattern 17. FIG. 1 is drawn so that the inside of the A casing 11 and the B casing 12 can be seen through, and the A grounding pattern 15 inside the A board 14 and the B grounding pattern 17 inside the B board 16 can be seen through. .

A wireless unit 18 is mounted on the B substrate 16. The wireless unit 18 includes a transmission unit and / or a reception unit that operate in a frequency band in which the wireless device 1 is used. Each of these includes a single element or a plurality of elements, but in FIG. 1, for convenience of explanation, it is comprehensively represented as one radio unit 18. The return circuit of the radio unit 18 is connected to the B ground pattern 17.
In the following description, it is assumed that the wireless unit 18 is a transmitting unit. However, even if the wireless unit 18 is a receiving unit, the direction of current is reversed in light of the general principle of antenna reversibility. Except for the point, the same explanation holds.

The wireless unit 18 is connected to the starting end of a feed line 19. The feeder line 19 includes a signal line and a return line, and is configured by, for example, a coaxial cable or a cascade connection of a microstrip line on the B substrate 16 and the coaxial cable.

An A connection point 20 is provided on the side of the A ground pattern 15 close to the connecting portion 13. Further, a B connection point 21 is provided on the side of the B ground pattern 17 close to the connecting portion 13. The end of the feed line 19 is a feed point 22 provided in the connecting portion 13, the signal line side of the feed point 22 is allowed to the A connection point 20 by the flexible conductor 23, and the return line side of the feed point 22 is acceptable. Each is connected to the B connection point 21 by a conductor 24 having flexibility. These connections will be described with reference to FIGS. FIG. 2 is a diagram illustrating an example of the connection of the power feeding system of the wireless device according to the first embodiment.
FIG. 3 is a diagram schematically showing the distribution of the antenna current path including the feeding point 22.

As described with reference to FIG. 1, the end point of the feed line 19 connected from the radio unit 18 mounted on the B substrate 16 (not shown in FIG. 2) is provided in the connecting unit 13. Feeding point 22
It is. The signal line side of the feeding point 22 is connected to the A ground pattern 1 by a flexible conductor 23.
5 is connected to the A connection point 20 provided in 5. The return line side of the feeding point 22 is connected to a B connection point 21 provided on the B ground pattern 17 by a conductor 24 having flexibility. In addition, even if the connection part 13 has two or more rotating shafts, it can connect in this way. A
A flexible substrate or the like that is often used for connection between the substrate 14 and the B substrate 16 is not shown in FIG.

As a result, the A ground pattern 15 operates as an antenna excited by the signal line side of the feeding point 22, and the path of the antenna current from the A connection point 20 to the opposite end of the A ground pattern 15 is, for example, FIG. As shown on the right side, it is divided into a plurality of distributions. Further, the B ground pattern 17 operates as a ground plane of the same antenna, and the return current path in the opposite direction to that of the A ground pattern 15 is divided into a plurality of distributions as shown on the left side of FIG. The antenna constituted by the A ground pattern 15 and the B ground pattern 17 resonates at a plurality of frequencies determined by a plurality of path lengths of the antenna current and the return current. The antenna can have a wide band as a result of multiple resonances.

Next, another example of the power feeding system connection of the wireless device according to the first embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram illustrating an example of the connection, and FIG. 5 is a diagram schematically illustrating the application. FIG. 4 shows a configuration in which the conductors 23 and 24 having flexibility shown in FIG. 2 are changed, and the description of other configurations that are the same as those in FIG. 2 is omitted.

In FIG. 4, the signal line side of the feeding point 22 is connected to a portion 23a having the rigidity of the conductor,
Further, it is connected to the connection point 20 by a conductor flexible portion 23b. The return line side of the feeding point 22 is connected to a portion 24a having the rigidity of the conductor, and is further connected to the connection point 21 by a portion 24b having the flexibility of the conductor. Thus, by providing rigidity to the connection before and after the feeding point 22 and limiting the portion having flexibility, the A casings 11 and B
An additional effect that the change in the shape of the connection from the feeding point 22 to the connection points 20 and 21 due to the opening / closing operation of the housing 12 is suppressed and the antenna characteristics are stabilized is obtained.

Such a connection is particularly effective when the A connection point 20 and the B connection point 21 are provided so as not to face the front as shown in FIG. 5
I will explain it. Note that the first embodiment does not limit the arrangement of the A connection point 20 and the B connection point 21 and the mutual positional relationship. ). In FIG. 5, the A board 14 and the B board 16 are in the same plane or close to each other with the A casing 11 and the B casing 12 being opened. In addition, the connection points 20 and 21 are provided so as not to face each other in front of each other (in a direction parallel to the longitudinal direction of the A substrate 14 or the B substrate 16). Therefore, by arranging the portions 23a and 24a having the rigidity of the conductor connected to the feeding point 22 in parallel with the rotation axis of the connecting portion 13 (not shown), the line associated with the opening / closing operation between the housings is arranged. Connections with little change in shape can be made.

Here, returning to FIG. 1, the possibility of deformation of the antenna element and the like will be described. FIG. 1 shows that the A casing 11 and the B casing 12 are rectangular parallelepiped, the A board 14 and the B board 16 are rectangular with a plate thickness, and the A grounding pattern 15 and the B grounding pattern 17 are rectangular. That is, the A grounding pattern 15 is formed in line symmetry with respect to an axis of symmetry that is included in a plane formed by the A ground pattern 15 and that is perpendicular to the rotation axis in the drawing. The same applies to the B ground pattern 17. By forming in this way, the radiation pattern characteristics around the symmetry axis can be made almost symmetrical.

However, except for the case where such symmetry of the radiation pattern is strongly required, the A ground pattern 15 and the B ground pattern 17 are formed in line-symmetric shapes in the first embodiment and the following embodiments. Not exclusively. Further, the A grounding pattern 15 and the B grounding pattern 17 do not necessarily form a single plane as a whole, and may have steps or slopes inside, and can take various shapes including this point. Similarly, the A casing 11, the B casing 12, the A substrate 14, and the B substrate 16 can take various shapes other than those shown in FIG. 1.

According to the first embodiment of the present invention, by using the ground pattern of the built-in substrate of each housing as an antenna element, the wireless device can be thinned and the built-in antenna can be widened. In addition, it is possible to suppress a change in the shape of the connection from the feeding point due to the opening / closing operation between the housings, and to obtain stable antenna characteristics.

The second embodiment of the present invention will be described below with reference to FIGS. Since the configuration of the wireless device according to the second embodiment is the same as that of the wireless device 1 according to the first embodiment except for the connection of the power feeding system, FIG. 1 can be applied as it is. Therefore, also in Example 2, the code | symbol showing the structure of FIG. 1 is used as it is for convenience of explanation (however, it may change as mentioned later about the feed line 19). FIG. 6 is a diagram illustrating an example of a power feeding system connection of the wireless device according to the second embodiment of the present invention. The first difference of FIG. 2 from FIG. 2 is that the flexible substrate 25 used for connection between the A substrate 14 and the B substrate 16 is clearly shown. The second difference is that the connection from the feeding point 22 to the A connection point 20 or the B connection point 21 is performed by a conductor included in the flexible substrate 25.

The signal line side of the feeding point 22 is connected to the A connection point 20 by a conductor 25 a included in the flexible substrate 25. The return line side of the feeding point 22 is connected to a B connection point 21 provided on the B ground pattern 17 by a conductor 25 b included in the flexible substrate 25. With such a connection, while effectively using a flexible substrate (flexible substrate 25 in the case of FIG. 6) that is often used for connection between cases, the power supply system is connected as shown in FIG. An antenna having the same characteristics can be constructed.

FIG. 7 is a diagram illustrating another example of the power feeding system connection of the wireless device according to the second embodiment. Also in this figure, the flexible substrate 26 used for the connection between the A substrate 14 and the B substrate 16 is clearly shown. In this figure, the feed line 19 a connected from the radio unit 18 is connected to the signal line side of the microstrip line 27 included in the flexible substrate 26. The signal line side of the microstrip line 27 is a conductor 26 included in the flexible substrate 26 at the feeding point 22.
which is further connected to the A connection point 20.

One end of the return line side of the microstrip line 27 is connected to the B ground pattern 17, and the other end is connected to the conductor 26 b included in the flexible substrate 26 at the feeding point 22.
An antenna having the same characteristics as the case where the feed system is connected as shown in FIG. 6 is configured by configuring the feed line 19a and the microstrip line 27 in the B substrate 16 equivalent to the feed line 19 of FIG. can do.

6 and 7 do not define the shapes of the flexible substrates 25 and 26 at all. Therefore, it is possible to use flexible substrates of various shapes including a crank shape often used for mobile phones.

According to the second embodiment of the present invention, it is possible to incorporate a broadband antenna in a thin casing by utilizing a flexible substrate for connecting between casings of a wireless device configured by connecting two casings. it can.

The third embodiment of the present invention will be described below with reference to FIGS. Since the configuration of the wireless device according to the third embodiment is the same as that of the wireless device 1 according to the first embodiment except for the connection of the power feeding system, FIG. 1 can be applied as it is. Therefore, also in Example 3, the code | symbol showing the structure of FIG. 1 is used as it is for convenience of explanation.

FIG. 8 is a diagram illustrating an example of a power feeding system connection of the wireless device according to the third embodiment. The first difference of FIG. 2 from FIG. 2 is that the end of the feeder line 19 (feed point 22) is provided not at the connecting portion 13 but at the end of the B ground pattern 17 (near the connection point 21). . The second difference is the feeding point 22.
The return line side is directly connected to the B connection point 21 without using the flexible conductor 24. The description of other components that are the same as those in FIG. 2 is omitted.

As a result, the signal line side of the feeding point 22 is connected to the A connection point 20 by a flexible conductor 23 provided so as to cross the connecting portion 13. Even if the connection is made in this way, the position of the feeding point 22 is changed to some extent as compared with the case of FIG. 2, so that an antenna having the same characteristics as when the feeding system is connected as shown in FIG. be able to. On the other hand, by connecting as shown in FIG. 8, it is not necessary to draw and connect the feed line 19 into the connecting portion 13, and the feed system connection can be performed more easily.

In FIG. 8, the feed line 19 is configured by, for example, a coaxial cable or a microstrip line on the B substrate 16. As in FIG. 2, even if the connecting portion 13 has two or more rotation shafts, the connection can be made in this way. Further, a flexible substrate or the like often used for connection between the A substrate 14 and the B substrate 16 is not shown because it is not essential for the connection in FIG.

Next, another example of the power feeding system connection of the wireless device according to the third embodiment will be described with reference to FIG. FIG. 9 is a diagram illustrating the connection example. The first difference between FIG. 8 and FIG.
This is a point that clearly shows the flexible substrate 29 used for connection with the substrate 16. Second
The difference is that the connection from the signal line side of the feeding point 22 to the A connection point 20 is performed by the conductor 29 a included in the flexible substrate 29.

Such a connection has the same characteristics as the case where the power feeding system is connected as shown in FIG. 8 while effectively using the flexible board (in the case of FIG. 9, the flexible board 29) that is often used for connection between the cases. An antenna can be configured.

According to the third embodiment of the present invention, there is an additional effect that the power feeding system can be easily connected.

Hereinafter, Embodiment 4 of the present invention will be described with reference to FIGS. 10 and 11. The configuration of the wireless device according to the fourth embodiment is the same as that of the wireless device 1 according to the first embodiment except that a portion corresponding to the wireless unit 18 and the feed line 19 is built in the connecting unit 13 and the connection of the feed system. . Therefore, the reference numerals representing the configuration of FIG. 1 excluding these parts are used as they are for the convenience of explanation.

FIG. 10 is a diagram schematically illustrating the arrangement of the wireless units and the connection of the power feeding system in the fourth embodiment. This figure shows a state in which the A casing 11 and the B casing 12 are opened and the A board 14 and the B board 16 are in the same plane or close to each other as in FIG. A substrate 14 and B substrate 16 in the figure
The A connection point 20 provided on the A ground pattern 15 (not shown) of the A substrate 14 and the B connection point 21 provided on the B ground pattern 17 (not shown) of the B substrate 16 are: The same as in the first embodiment (for example, FIG. 5).

In the figure, reference numeral 30 denotes a flexible substrate for connecting the A substrate 14 and the B substrate 16, and is configured to be capable of mounting components including active elements. This corresponds to, for example, what is called a rigid flexible substrate. A wireless unit 31 is mounted on the flexible substrate 30. An output end on the signal line side of the wireless unit 31 is connected to the A connection point 20 by a conductor 32 included in the flexible substrate 30. Further, the output end on the return line side of the wireless unit 31 is connected to the B connection point 21 by the conductor 33 included in the flexible substrate 30. In this figure, a signal input is given to the radio unit 31 from the B board 16 side through the input line 34. However, the present invention is not limited to this, and a signal input may be given from the A board 14 side.

FIG. 11 shows the same power supply system connection as in FIG. 10 in the same format as FIG. This connection is as described above, and a description thereof will be omitted. By mounting the wireless unit 31 on the flexible board in this way, a small signal line such as the input line 34 is connected to the connecting unit 13 as compared with the case where the output of the wireless unit 18 is drawn into the connecting unit 13 as shown in FIG. There is an advantage that the circuit configuration becomes easy in the sense that it only needs to be pulled in. In addition, there is an advantage that the loss of the feed line is relatively small.

According to the fourth embodiment of the present invention, the additional effect of facilitating the configuration of the feed system and reducing the feed line loss can be obtained.

Hereinafter, Embodiment 5 of the present invention will be described with reference to FIGS. FIG. 12 is a diagram illustrating the configuration of a wireless device according to the fifth embodiment of the present invention. 4 in the figure is the wireless device.

The wireless device 4 is configured by connecting an A casing 41 and a B casing 42 via a connecting portion 43 so as to be opened and closed. The A casing 41 contains an A substrate 44, and the A substrate 44 has an A grounding pattern 45.
Is provided. The B housing 42 incorporates a B substrate 46, and the B substrate 46 has a B ground pattern 4.
7 is provided.

In FIG. 12, the A casing 41 and the B casing 42 can be opened and closed by rotating around one rotation axis that is parallel to the longitudinal direction of the connecting portion 43. In some cases, two or more rotation axes are provided and the opposing surfaces of the A casing 41 and the B casing 42 are interchanged so as to be closed. The point drawn so that the grounding pattern inside the housing or the substrate can be seen through is the same as FIG.

Here, the point that the A grounding pattern 45 is provided on the grounding layer, component mounting surface, or signal wiring surface of the multilayer or single layer A substrate 44 is the same as the A grounding pattern 15 of FIG. The same applies to the B ground pattern 47. The A grounding pattern 45 and the B grounding pattern 47 are
Each is formed in a plane. The relationship between these planes will be described next with reference to FIG.

FIG. 13 is a diagram illustrating the configuration of the wireless device 4 as viewed from the side in the closed state in which the A casing 41 and the B casing 42 are closed. The reference numerals in the figure are all the same as those included in FIG. As shown in this figure, the A grounding pattern 45 and the B grounding pattern 4
The planes formed by 7 are parallel to each other in this state.

However, as described in the first embodiment, the A grounding pattern 45 and the B grounding pattern 47 do not necessarily form a single plane as a whole, and have a step or an inclination inside, or are strictly parallel to each other. There may be no. In other words, “make a plane” or “parallel”
This includes the case where a substantial part of the A grounding pattern 45 and the B grounding pattern 47 is flat and parallel in the closed state as long as the effect of the fifth embodiment is obtained even if not strictly. Shall be.

Next, returning to FIG. 12, the wireless unit 48 is mounted on the B board 46, and its return circuit is connected to the B ground pattern 47. The wireless unit 48 is the same as the wireless unit 18 of FIG. The wireless unit 48 is connected to the starting end of the feed line 49 that is the same as the feed line 19 of FIG.

An A connection point 50 is provided on the side of the A ground pattern 45 close to the connecting portion 43. Further, a B connection point 51 is provided on the side of the B ground pattern 47 closer to the connecting portion 43. The end of the feed line 49 is a feed point 52 provided in the connecting portion 43. The signal line side of the feed point 52 is allowed to be connected to the A connection point 50 by a flexible conductor 53, and the return line side of the feed point 52 is allowed. Each is connected to the B connection point 51 by a conductor 54 having flexibility. These connections are made by any of the methods described in the first to fourth embodiments.

Next, the positional relationship between the A connection point 50 and the B connection point 51 will be described with reference to FIG. FIG. 14 is a diagram for explaining the positional relationship in addition to FIGS. 12 and 13, and is drawn without representing the wireless unit 48, the feed line 49, and the like in order to avoid the complexity of the drawing. Here, a plane formed by the A grounding pattern 45 and a virtual plane 6 orthogonal to the rotation axis are considered. The virtual plane 6 is provided so as to equally divide the area of the A ground pattern 45. In a normal case, this is equivalent to the fact that the virtual plane 6 is provided vertically across the center of the A casing 41 and the B casing 42 and perpendicular to the rotation axis. However, since the shape of the A grounding pattern 45 is not necessarily formed line-symmetrically, it is defined as described above. In some cases, the virtual plane 6 may be provided so that the area of the B ground pattern 47 is equally divided.

The A connection point 50 and the B connection point 51 are arranged on both sides of the virtual plane 6. As a result, the distance vector from the A connection point 50 to the B connection point 51 has a non-zero value component in the direction of the rotation axis (
This is called a substantially crank shape. ). In this state, it is assumed that power is supplied from the feed point that is the end of the feed line 49 to the A connection point 50 and the B connection point 51 in the same manner as in any of the first to fourth embodiments. The path of the antenna current when the A casing 41 and the B casing 42 are closed is schematically shown in FIG. FIG. 15 is a schematic diagram illustrating an example of an antenna current path when the casing of the wireless device according to the fifth embodiment is closed. All reference numerals in the figure are the same as those in FIG.

The antenna current path in this case is represented by, for example, a thick arrow in FIG. The antenna current flowing through the A board 44 (A ground pattern 45) and the B board 46 (B ground pattern 4)
The return currents flowing through 7) are almost in the long side direction of the A substrate 44 and the B substrate 46 and are opposite to each other. Therefore, the contribution of these currents to the radiated power from the antenna is
It acts to counteract each other.

On the other hand, current flows through the conductors 53 and 54 substantially along the short side direction of the A substrate 44 and the B substrate 46 (a direction parallel to the rotational axis direction component of the distance vector in FIG. 14). Since this counter current does not exist in the opposite direction, it effectively contributes to the radiated power from the antenna. In this case, the resonance frequency is first determined by the length of the portion of the conductors 53 and 54 parallel to the short side direction of the A substrate 44, and secondly determined by the sum of the total lengths of the conductors 53 and 54, A plurality of values are taken, such as a value determined by a length obtained by adding the long side direction of the A substrate 44 and the B substrate 46 to the third substrate. In particular, the first and second values are relatively high resonance frequencies, which contribute to the broadening of the antenna.

However, if the total length of the conductors 53 and 54 is too short, the direction component of the antenna current that effectively contributes to the radiated power from the antenna is lost, and the effect of widening the band is impaired. It is considered that at least about a fraction of the wavelength corresponding to the upper limit frequency used by the wireless device 4 is desirable. From the above, the A connection point 50 and the B connection point 51 in FIG.
, The A connection point 50 and the B connection point 51 are located on both sides of the virtual plane 6 and are parallel to the rotation axis of the distance vector from the A connection point 50 toward the B connection point 51. It is appropriate that the value of is at least 1/10 of the wavelength corresponding to the upper limit frequency.

As described with reference to FIG. 5 in the first embodiment, a portion of the conductors 53 and 54 that is parallel to the short side direction of the A substrate 44 is given rigidity so that the A substrate 44 and the B substrate 46 are provided. Both ends connected to can be configured to have flexibility. Then, the opening / closing operation of the A casing 41 and the B casing 42 suppresses a change in the shape of the connection from the feeding point 52 to the connection points 50 and 51, and an additional effect that the antenna characteristics are stabilized is obtained.

FIG. 16 is a diagram illustrating an example of an arrangement of a power feeding system according to the fifth embodiment. The left side of FIG. 16 represents the positional relationship between the A grounding pattern 45, the B grounding pattern 47, and the connecting portion 43. The right side of FIG. 16 represents a state in which the A grounding pattern 45 and the B grounding pattern 47 are fed from a feeding point 52 near the center of the flexible substrate 53 via a substantially crank-shaped conductor.

FIG. 17 shows the evaluation of the voltage standing wave ratio (VSWR) characteristics of the antenna in which the feeding system is arranged as shown in FIG. 16 with the A casing 41 and the B casing 42 closed by computer simulation. It is an example of a result. The horizontal axis is a frequency in the range of 0.5 to 5 GHz. The vertical axis represents VSWR expressed in units of 0.5 on a scale. On the other hand, FIG. 18 is an example of a result of a similar evaluation of the VSWR characteristics when power is supplied to the A grounding pattern 45 and the B grounding pattern 47 at the shortest distance from the feeding point 52 without taking a substantially crank shape. It can be seen that the VSWR characteristics of FIG. 17 are significantly improved in the band of 3.5 GHz or higher compared to the VSWR characteristics of FIG.

According to the fifth embodiment of the present invention, the built-in antenna can be widened even in the closed state in which the two housings of the wireless device are closed.

Hereinafter, Embodiment 6 of the present invention will be described with reference to FIGS. 19 and 20. FIG. 19 is a diagram illustrating a main configuration of a wireless apparatus according to Embodiment 6 of the present invention. Reference numeral 7 in the figure denotes the wireless device.

The wireless device 7 is configured such that an A casing 71 and a B casing 72 are connected via a connecting portion 73 so as to be opened and closed. The A casing 71 incorporates an A substrate 74, and the A substrate 74 has an A grounding pattern 75.
Is provided. The B housing 72 includes a B substrate 76, and the B substrate 76 has a B ground pattern 7.
7 is provided.

In FIG. 19, the A casing 71 and the B casing 72 can be opened and closed by rotating around one rotation axis that is parallel to the longitudinal direction of the connecting portion 73. In some cases, it may be opened and closed with two or more pivot shafts. The point drawn so that the grounding pattern inside the housing or the substrate can be seen through is the same as FIG. The A ground pattern 75 is the same as the A ground pattern 15 of FIG. 1 in that the A ground pattern 75 is provided on the ground layer, component mounting surface, or signal wiring surface of the multilayer or single layer A substrate 74. The same applies to the B ground pattern 77.

A wireless unit 78 is mounted on the B substrate 76, and its return circuit is connected to the B ground pattern 77. The wireless unit 78 is the same as the wireless unit 18 of FIG. In addition, the wireless unit 78 has the configuration shown in FIG.
The same feed line 79 as that of the feed line 19 is connected.

An A connection point 80 is provided on the side of the A ground pattern 75 close to the connecting portion 73. Further, a B connection point 81 is provided on the side of the B ground pattern 77 close to the connecting portion 73. The end of the feed line 79 is a feed point 82 provided at the connecting portion 73, the signal line side of the feed point 82 is allowed to the A connection point 80 by the flexible conductor 83, and the return line side of the feed point 82 is allowed. Each is connected to the B connection point 81 by a conductor 84 having flexibility. These connections are made by any of the methods described in the first to fourth embodiments.

In the closed state in which the A casing 71 and the B casing 72 are closed, an A short-circuit portion 85 is provided on the surface of the A casing 71 facing the B casing 72. The A short-circuit portion 85 is a connection terminal made of, for example, a conductor, and is connected to the A ground pattern 75. A B short-circuit portion 86 is provided on the surface of the B casing 72 facing the A casing 71 in the closed state. The B short-circuit portion 86 is a connection terminal made of, for example, a conductor, and is connected to the B ground pattern 77.

Here, the B short-circuit portion 86 is disposed so as to be short-circuited in contact with the A short-circuit portion 85 in the closed state (the arc-shaped broken line in FIG. 19 represents this). In addition, a short circuit shall mean the equivalent short circuit which arises by conduction | electrical_connection by a direct connection, or electrostatic coupling or electromagnetic coupling in a radio frequency band.

In FIG. 19, the A short-circuit portion 85 is provided at the end portion farthest from the connection portion 73 of the A grounding pattern 75. Further, the B short-circuit portion 86 is provided at the end portion farthest from the connecting portion 73 of the B ground pattern 77. The position where the A short-circuit portion 85 is provided is not limited to this, and the electric field strength of a signal of a required radio frequency fed from the feeding point 82 in the open state in which the A casing 71 and the B casing 72 are opened is maximum. It suffices if it is in the vicinity of the point. Further, the B short-circuit portion 86 may be provided at a position short-circuited to the A short-circuit portion 85 in the closed state.

Next, the antenna operation of the wireless device 7 in the closed state will be described with reference to FIG. FIG. 20 is a diagram illustrating the configuration of the wireless device 7 as viewed from the side in the closed state in which the A casing 71 and the B casing 72 are closed. The reference numerals representing the components in the figure are all the same as in FIG. The A short circuit portion 85 and the B short circuit portion 86 are short-circuited to each other in the closed state.

As shown in FIG. 20, a line composed of an A grounding pattern 75 and a conductor 83 connected to the signal line side of the feeding point 82 and a B grounding pattern 77 and a conductor 84 connected to the return line side of the feeding point 82 is provided. The terminal is short-circuited by the A short-circuit portion 85 and the B short-circuit portion 86. This corresponds to a case where the capacitance value loaded at the end of the transmission line is infinite.

When such a termination short circuit is not performed in the closed state, the A grounding pattern 75 and B
Since currents of opposite phases flow through the ground pattern 77, the overall radiation efficiency is lowered. Further, the impedance and resonance frequency of the antenna viewed from the feeding point 82 depend on the constant distribution state between the A ground pattern 75 and the B ground pattern 77. Since the distribution state of the constant is affected by the variation among the individual wireless devices, it is difficult to control by design. For this reason,
In some cases, the resonance frequency does not coincide with a desired value, the impedance of the antenna at the resonance frequency is high, and the VSWR characteristic is deteriorated.

On the other hand, when the terminal is short-circuited, currents in the same phase flow through the A grounding pattern 75 and the B grounding pattern 77, so that a reduction in the radiation efficiency as a whole can be avoided. Moreover, since this corresponds to making the capacitance value loaded at the end of the transmission line infinite, it is possible to ignore the contribution of the variation between individual radio devices, which is a finite value, and to set the antenna impedance and resonance frequency as desired. It becomes easy to design to match the value of. By utilizing this fact, it is possible to stably achieve a broad band of the built-in antenna in the closed state by short-circuiting between the A short-circuit portion 85 and the B short-circuit portion 86.

In the sixth embodiment, the A short-circuit portion 85 is at the end farthest from the connecting portion 73 of the A ground pattern 75, and the B short-circuit portion 86 is at the end farthest from the connecting portion 73 of the B ground pattern 77, Each was connected and provided. The A short-circuit portion 85 is not limited to this, and may be provided on the A ground pattern 75 at a position where the electric field strength of a desired frequency is high. In that case, the B short-circuit portion 86 also needs to be provided at a position corresponding to the position of the A short-circuit portion 85.

The A short-circuit portion 85 in FIG. 19 is substantially represented by a point when viewed from a direction perpendicular to the A grounding pattern 75, but is not limited thereto, and may be configured with a certain width or area. Further, the A short-circuit portion 85 can be configured with a part or all of one end of the A grounding pattern. The A grounding pattern may be formed to form a polygon, and the A short-circuiting portion 85 may be configured with the end portions corresponding to one or more sides thereof. In these cases, it is necessary to arrange and configure the B short-circuit portion 86 so as to correspond to the shape and position of the A short-circuit portion 85.

The wireless device 7 may be configured such that the A casing 71 and the B casing 72 are connected to each other so as to be openable and closable with two or more rotation axes. In such a case, the mutually facing surfaces of the A casing 71 and the B casing 72 can be combined and closed differently from those in FIG. That is, a plurality of different closed states can be taken by combining the mutually facing surfaces of the A casing 71 and the B casing 72. The A grounding pattern 75 and the B grounding pattern 7 are formed on the surfaces of the A casing 71 and the B casing 72 facing each other in each of the plurality of different closed states.
In addition to the A short-circuit portion 85 and the B short-circuit portion 86, a short-circuit portion may be provided so as to be short-circuited with 7.

According to the sixth embodiment of the present invention, by configuring the built-in antenna so as to form a terminal short-circuited line in the closed state, a stable broadband can be achieved in the state.

1, 4, 7 Wireless devices 11, 41, 71 A housings 12, 42, 72 B housings 13, 43, 73 Connecting portions 14, 44, 74 A substrates 15, 45, 75 A grounding patterns 16, 46, 76 B substrate 17, 47, 77 B ground pattern 18, 31, 48, 78 Radio unit 19, 49, 79 Feed line 20, 50, 80 A connection point 21, 51, 81 B connection point 22, 52, 82 Feed point 23 24, 53, 54, 83, 84 Flexible conductors 23a, 24a Conductor rigidity portions 23b, 24b Conductor flexibility portions 25, 26, 29, 30, 53 Flexible substrates 25a, 25b Conductors 26a and 26b included in flexible substrate 25 Conductor 27 included in flexible substrate 26 Microstrip line 29a included in flexible substrate 26 Flexible Conductor 34 input line 6 imaginary plane 85 A connection point 86 B connecting points included in the conductor 32, 33 a flexible board 30 contained in the substrate 29

Claims (6)

A first housing;
A second housing;
A connecting portion that connects the first housing and the second housing so as to be openable and closable;
A feed line consisting of a signal line and a return line, and a feed point as a feed point provided at the connection part of the radio frequency signal belonging to the band to be used as a termination,
A first ground pattern having a first connection point connected to the signal line side of the feeding point is provided in the first casing. A substrate,
A second grounding pattern is incorporated in the second housing, and the second grounding pattern has a second connection point connected to the return line side of the feeding point. A substrate,
A flexible substrate including a conductor that connects the first substrate and the second substrate through the connecting portion and connects the signal line side of the feeding point and the first connection point;
A wireless unit mounted on the second substrate or the flexible substrate and connected to the starting end of the feeder line;
A wireless device comprising: The wireless device according to claim 1, wherein the flexible substrate further includes a conductor connecting a return line side of the feeding point and the second connection point. The flexible substrate further includes a conductor connecting a return line side of the feeding point and the second connection point, and the feeding line includes a microstrip line included in the flexible substrate. The wireless device according to claim 1. The wireless device according to claim 1, wherein a return line side of the feeding point is directly connected to the second connection point. The first casing and the second casing are provided on a surface of the first casing opposite to the second casing in a closed state in which the first casing and the second casing are closed, and are connected to the first ground pattern. A first short-circuit portion,
A second surface connected to the second ground pattern and provided on the surface of the second housing opposite the first housing so as to be short-circuited to the first short-circuit portion in the closed state.
The wireless device according to claim 1, further comprising: a short-circuit portion. The first casing and the second casing are provided on a surface of the first casing opposite to the second casing in a closed state in which the first casing and the second casing are closed. In the vicinity of a point on the first ground pattern where the electric field strength of a signal of a required radio frequency fed from the feed point to the first ground pattern is maximized in the open state where the second housing is opened A first short-circuit connected to
A second surface connected to the second ground pattern and provided on the surface of the second housing opposite the first housing so as to be short-circuited to the first short-circuit portion in the closed state.
The wireless device according to claim 1, further comprising: a short-circuit portion.

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