JP4388435B2 - Portable wireless terminal - Google Patents

Description

  The present invention relates to a portable wireless terminal used for a mobile phone, a mobile wireless device, and the like, and more particularly to a portable wireless terminal with improved gain during a call.

  An example of a conventional portable wireless terminal will be described. A foldable mobile phone that is widely used at present is configured such that a first element and a second element are made of metal or conductive across a foldable upper and lower casing (case). Some of them are connected using a sex hinge. For example, in Patent Document 1, a first element and a hinge part are electrically connected, a gap is provided between the hinge part and the second element, power is supplied between the gaps, and a dipole antenna is configured and operated over the entire mobile phone. Thus, good antenna characteristics are obtained in the state of use in a 900 MHz band mobile phone.

FIG. 24 shows a conventional foldable portable radio telephone. In the figure, 1 is a first element, 2 is a second element, 3 is a feeding point, 4 is a feeding line, 5 is a radio section, 6 is a hinge section, 7 is a lower case, and 8 is an upper case. As for the size used in the current mobile phone, the upper case 8 is about 70 to 90 mm, the lower case is about 80 to 100 mm, and the width is about 40 to 50 mm. Now, assuming a mobile phone having a length of the first element of 90 mm and a length of the second element of 95 mm, in a mobile phone system having an operating frequency band of 800 MHz to 1 GHz, vertical polarization as shown by a solid line in FIG. And a radiation characteristic close to that of a half-wavelength dipole antenna (broken line) is obtained. By the way, in such a wide dipole antenna configuration using a foldable casing, in the high frequency band such as the operating frequency of 1900 MHz, the width of the element is about 1/4 wavelength, and is vertical (broken line) as shown in FIG. Both horizontal (solid lines) polarization components are emitted.
JP 2004-056426 A

  However, in such a dipole antenna configuration, when the portable radio terminal is folded, the currents flowing on the upper and lower elements are opposite to each other and do not radiate, and the dipole antenna is wide with respect to the wavelength of the operating frequency band. In the configuration, the current distribution is concentrated between the gaps of the upper and lower elements, and there is a problem that the influence from the human body is great and the gain at the time of communication is deteriorated.

  An object of the present invention is to solve the above-described problems, and to provide a portable wireless terminal that obtains antenna characteristics that are less affected by the human body and have high gain even when folded.

The foldable portable wireless terminal according to the present invention includes a first housing, a second housing, a ground plate or a conductive housing, and a first element provided in the first housing, a ground plate or a conductive material. The second element provided in the second casing, and between the first element and the second element and provided at a position other than the base plate or the center of the casing. A foldable portable wireless terminal that forms a dipole antenna with a feeding point, wherein a slot with the feeding point as a base point is formed on the first element or the second element, and the first element and the second element The power is supplied between the two .

  According to the above configuration, since the polarized component orthogonal to the radiation component radiated from the dipole antenna configuration can be radiated from the slot, the gain in the call state can be improved.

  According to the present invention, the slot having the feed point as the base point is arranged on the first or second element of the dipole antenna configuration, so that the length of the slot is approximately 1/4 with respect to the first operating frequency band. The wavelength can be longer than the wavelength, and the radiation component radiated from the dipole antenna configuration and the polarization component orthogonal to the radiation component can be radiated from the slot, thereby improving the gain in a call state.

  The gist of the present invention is to form a slot in the vertical direction in at least one of the first or second element.

  The details of the embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1)
FIGS. 1A and 1B are configuration diagrams (front view) of the portable wireless terminal according to the first embodiment of the present invention. In FIG. 1, 1 is a planar first element, 2 is a planar second element, 3 is a feeding point, 4 is a feeding line, 5 is a radio unit, 6 is a hinge, and 7 is an upper case (first housing). ), 8 indicates a lower case (second casing). The portable wireless terminal includes a first element 1 and a second element 2 that are configured from a ground plane or a conductive casing. The portable wireless terminal is provided with a feeding point 3 between the first element 1 and the second element 2, and the feeding point 3 is arranged at a position other than the central portion of the ground plane or the casing. As a result, the first element 1, the second element 2, and the feed point 3 constitute a dipole antenna. On the first element 1 and / or the second element 2, a slot 9 with the feeding point 3 as a base point is formed. The length of the slot 9 is approximately ¼ wavelength or more with respect to the first operating frequency band.

  Thus, according to this embodiment, even when the slot 9 is formed only in the first element 1 (FIG. 1A), the current distribution (FIG. 2B) of the conventional dipole antenna configuration is In comparison, the current distribution can be increased to the upper side of the first element 1 by the slot 9 provided in the upper case 7 as shown in FIG. A similar current distribution is obtained even when the slot 9 is formed only in the second element 2 (FIG. 1B). Further, due to the slot 9, the horizontal polarization component indicated by the solid line as in the radiation characteristic shown in FIG. 3A is in the X-axis direction as compared with the conventional radiation characteristic having no slot in FIG. 3B. When there is a slot, a radiation component radiated from the dipole antenna configuration composed of the first element 1 and the second element 2 is also radiated from the slot to the horizontal polarization component, and the portable radio terminal is in a talking state. Since it matches the incoming polarization from the base station when the is tilted, the gain can be improved.

(Embodiment 2)
4 (a) and 4 (b) are configuration diagrams (front views) showing the portable wireless terminal according to the second embodiment of the present invention. In FIG. 4, the same parts as those in FIG.

  As shown in FIG. 4A, the portable wireless terminal according to the second embodiment has an opening formed by cutting out the feeding point 3 side of the slot 9 formed on the first element 1 and further switching the antenna into this opening. Short-circuit switches 10 and 11 are arranged. That is, the antenna switching short-circuit switch 10 for connecting the first element 1 on the right side of the slot 9 connected to the feeding point 3 to the first element 1 on the left side of the slot 9 in the figure, the first element 1 and the second element 2 An antenna switching short-circuit switch 11 is connected.

  As described above, according to the present embodiment, the antenna configuration short-circuiting switch 10 is short-circuited and the antenna-switching short-circuiting switch 11 is opened, whereby the antenna configuration shown in the first embodiment (FIG. 1A). Further, by opening the antenna switching short-circuit switch 10 and short-circuiting the antenna switching short-circuit switch 11, the antenna configuration and its directivity are switched by switching the short-circuit switch, and as shown in FIG. As the current distribution, as shown in FIG. 6, the gain in the talking state can be further improved by radiating the horizontal polarization component also from the slot.

  As shown in FIG. 4B, the same effect can be obtained even if the slot 9 and the antenna switching short-circuit switches 10 and 11 are arranged on the second element 2.

(Embodiment 3)
FIGS. 7A and 7B are configuration diagrams (front views) showing the portable wireless terminal according to the third embodiment of the present invention. 7 that are the same as those in FIGS. 1 and 4 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 7 (a), the portable wireless terminal of the third embodiment starts from the feeding point 3 side in the slot 9 configured on the first element 1 and starts the second operation at the first operation frequency or higher. The frequency switching short-circuit switch 12 is arranged at a position of 1/4 wavelength or more with respect to the frequency. That is, the frequency-switching short-circuit switch 12 that connects the first element 1 on the right side of the slot 9 to the first element 1 on the left side of the slot 9 is disposed at the above-mentioned 1/4 wavelength or more position. .

Thus, according to this embodiment, when the first operating frequency and 1500 MHz, the slot 9 or 1/4 wavelength of the first operational frequency as shown in FIG. _{7 (a) (λ 0/} 4 The slot 9 having the above length is operated, and the current distribution is as shown in FIG. 8, and the radiation characteristics shown in FIG. 9 are obtained. The horizontal polarization component is also radiated from the slot 9 to further increase the gain in the talk state. Can be improved. Also, assuming that the second operating frequency band is 1900 MHz, the slot 9 is short-circuited at the second operating frequency by short-circuiting the slot 9 by the frequency switching short-circuit switch 12.

  For example, if the frequency switching short-circuit switch 12 is made equal to the length of the slot 9 shown in the first embodiment from the opening end, it becomes equivalent to the current distribution shown in FIG. 2A, and the radiation characteristic is also shown in FIG. It becomes equivalent. Furthermore, by switching the antenna switching short-circuit switches 10 and 11, the antenna can be switched at a plurality of frequencies, the directivity characteristic can be changed, and the gain in the call state and the standby state can be improved.

  As shown in FIG. 7B, the same effect can be obtained even if the slot 9, the antenna switching short-circuit switches 10, 11 and the frequency switching short-circuit switch 12 are arranged on the second element 2. .

(Embodiment 4)
10 (a) and 10 (b) are configuration diagrams (front view) showing the portable radio terminal according to the fourth embodiment of the present invention. Note that, in FIG. 10, the same reference numerals are given to portions overlapping with FIGS. 1 and 4, and description thereof is omitted.

  As shown in FIG. 10 (a), the portable wireless terminal of the fourth embodiment starts from the feeding point 3 side in the slot 9 configured on the first element 1 and starts the second operation at the first operation frequency or higher. A slot length switching short circuit 13 is arranged at a position of 1/4 wavelength or more with respect to the frequency. That is, the Zn slot length switching short-circuit 13 is formed by bridging the first element 1 on the right side of the slot 9 with the first element 1 on the left side of the slot 9 in the figure.

Thus, according to this embodiment, when the first operating frequency and 1500 MHz, FIG 10 (a) as shown in the slot 9 or quarter wavelength of a first operating frequency (λ _0/4 The slot of the above length is operated, and its current distribution is as shown in FIG. 8, and the radiation characteristic shown in FIG. 9 is obtained, and the horizontal polarization component is also radiated from the slot, thereby further improving the gain in the talk state. be able to. If the second operating frequency band is 1900 MHz, the slot 9 is short-circuited by the slot length switching short circuit 13 to shorten the length of the slot 9 at the second operating frequency.

  For example, if the slot length switching short circuit 13 is equivalent to the length of the slot 9 shown in the first embodiment from the opening end, the current distribution shown in FIG. 2A is equivalent, and the radiation characteristic is also shown in FIG. It becomes equivalent. Furthermore, by switching the antenna switching short-circuit switches 10 and 11, the antenna can be switched at a plurality of frequencies as in the third embodiment, the directivity characteristics are changed, and the gain in the call state and the standby state is increased. Can be improved. Moreover, a simpler configuration can be achieved as compared with the third embodiment.

  As shown in FIG. 10B, the same effect can be obtained even if the slot 9, the antenna switching short-circuit switches 10, 11 and the slot length switching short-circuit switch 13 are arranged on the second element 2. it can.

(Embodiment 5)
FIG. 11 is a configuration diagram (front view) showing a portable radio terminal according to the fifth embodiment of the present invention. In FIG. 11, the same parts as those in FIGS. 1 and 4 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, the portable wireless terminal according to the fifth embodiment starts at the feeding point 3 side in the slot 9 formed on the first element 1 and is ¼ wavelength or more with respect to the first operating frequency. The slot 9 is arranged, and the shape of the slot 9 is bent at least once.

  As shown in FIG. 11, the slot 9 is formed in an inverted U-shape to short-circuit the antenna switching short-circuit switch 10 and open the antenna switching short-circuit switch 11. As a result, the current distribution as shown in FIG. 12A is obtained, and the current component flowing in the slot 9 has the same phase at the short-circuited end a and the short-circuited end b of the slot 9, and the phase of the radiation component radiated from the slot 9 is the same. To do. Thus, the radiation characteristic shown in FIG. 13A is obtained. Compared with the radiation characteristic and the portable wireless terminal described in the first embodiment, the radiation characteristic is orthogonal to the radiation component radiated from the dipole antenna configuration. The mobile radio terminal of the fifth embodiment is more human body due to the dipole antenna configuration in the call state shown in FIG. Therefore, the slot 9 can be reduced in size and the influence from the human body can be reduced.

  Further, by opening the antenna switching short-circuit switch 10 and short-circuiting the antenna switching short-circuit switch 11, the antenna and directivity are switched by switching the short-circuit switch, and the current distribution as shown in FIG. As shown in FIG. 13B, the horizontal polarization component can be radiated also from the slot, and the gain in the call state can be further improved.

(Embodiment 6)
FIGS. 15A and 15B are configuration diagrams (front views) showing the portable wireless terminal according to the sixth embodiment of the present invention. In FIG. 15 (a), the same parts as those in FIGS. 1, 4 and 11 are given the same reference numerals, and the description thereof is omitted.

  The portable radio terminal according to the sixth embodiment has a slot 9 formed on the first element 1 with a feed point 3 as a starting point and a slot 9 having a quarter wavelength or more with respect to the first operating frequency. And the slot 9 is bent at least once.

  As shown in FIG. 15, a directivity switching short-circuit switch 14 is provided at an arbitrary position on the slot 9. That is, the directivity switching short-circuit switch 14 shorts a portion defined by the slot 9 of the first element 1.

  With the above configuration, the antenna switching short-circuit switch 10 is short-circuited and the antenna switching short-circuit switch 11 is opened, whereby the directivity switching short-circuit switch 14 is turned on / off, as shown in the current distribution of FIG. In addition, the slot length can be arbitrarily changed, and the radiation pattern shown in FIG.

  Further, by opening the antenna switching short-circuit switch 10 and short-circuiting the antenna switching short-circuit switch 11, the antenna and directivity are switched by switching the short-circuit switch 14, resulting in a current distribution as shown in FIG. As shown in FIG. 17B, the horizontally polarized wave component can also be radiated from the slot 9 to further improve the gain in the call state.

  Further, by short-circuiting the antenna switching short-circuit switch 10, it is possible to operate in a frequency band in which the length of the slot 9 is ¼ wavelength or more with respect to the operating frequency.

  As shown in FIG. 15B, the same effect can be obtained even if the slot 9, the antenna switching short-circuit switches 10, 11 and the directivity switching short-circuit switch 14 are arranged on the second element 2. it can.

(Embodiment 7)
FIG. 18 is a configuration diagram (front view) showing a portable radio terminal according to the seventh embodiment of the present invention. Note that, in FIG. 18, the same reference numerals are given to the same portions as those described in the embodiments so far, and description thereof is omitted.

  In the portable radio terminal according to the seventh embodiment, slots 9 having a quarter wavelength or more with respect to the first frequency are arranged for both the first element 1 and the second element 2.

  With the above configuration, the antenna switching short-circuit switch 10 is short-circuited, and the antenna switching short-circuit switch 11 is opened, so that the radiation component radiated from the dipole antenna configuration radiated from the two slots 9 as shown in FIG. Can be further radiated to further improve the gain in the speech state.

(Embodiment 8)
FIG. 20 is a configuration diagram (front view) showing a portable radio terminal according to the eighth embodiment of the present invention. Note that, in FIG. 20, the same reference numerals are given to the same portions as those described in the embodiments so far, and description thereof is omitted.

  The portable radio terminal according to the eighth embodiment includes a switching control unit 15 that switches between the antenna switching short-circuit switch 10 and the directivity switching short-circuit switch 14 (or the frequency switching short-circuit switch 12).

  With the above configuration, the directivity switching short-circuit switch 14 is switched from the switching control unit 15 and the slot length of the slot 9 is switched according to the received electric field strength received by the wireless unit 5, thereby depending on the usage mode of the portable wireless terminal. The directivity characteristic can be switched to the optimum directivity characteristic both during a call and during standby.

(Embodiment 9)
FIG. 21 is a configuration diagram (front view) showing a portable radio terminal according to the ninth embodiment of the present invention. Note that, in FIG. 21, the same reference numerals are given to the same portions as those described in the embodiments so far, and description thereof is omitted.

  The portable wireless terminal according to the ninth embodiment has a detection determination function for detecting that the portable wireless terminal is a foldable terminal and that the portable wireless terminal is folded.

  When the above configuration is applied to a foldable form wireless device, the open / close detection unit 16 grasps the open / closed state of the housing, and when the housing is open, the switching control unit according to the received electric field strength received by the wireless unit 5 By switching the directivity switching short-circuit switch 14 (or the frequency switching short-circuit switch 12) from 15 and switching the slot length of the slot 9, it is possible to switch to the directivity characteristic according to the usage mode of the portable wireless terminal.

  On the other hand, as shown in FIG. 22, when the housing is closed, the antenna switching short-circuit switch 10 is opened and radiated from the slot 9, so that the radiation characteristics shown in FIG. It becomes possible to switch to the directivity characteristic according to the form, and it is possible to obtain the optimal directivity characteristic at the time of calling and standby.

  The present invention is suitable for use in a portable radio terminal that is desired to improve the radiation characteristics by improving the gain.

Configuration diagram of portable wireless terminal according to Embodiment 1 of the present invention Current distribution diagram of Embodiment 1 of the present invention Radiation characteristic diagram of Embodiment 1 of the present invention Configuration diagram of portable wireless terminal according to Embodiment 2 of the present invention Current distribution diagram of Embodiment 2 of the present invention Radiation characteristic diagram of Embodiment 2 of the present invention Configuration diagram of portable wireless terminal according to Embodiment 3 of the present invention Current distribution diagram of Embodiment 3 of the present invention Radiation characteristic diagram of Embodiment 3 of the present invention Configuration diagram of portable wireless terminal according to Embodiment 4 of the present invention Configuration diagram of portable wireless terminal according to the fifth embodiment of the present invention Current distribution diagram of Embodiment 5 of the present invention Radiation characteristic diagram of Embodiment 5 of the present invention Explanatory drawing of gain characteristic at the time of call of Embodiment 5 of this invention Configuration diagram of portable wireless terminal according to Embodiment 6 of the present invention Current distribution diagram of Embodiment 6 of the present invention Radiation characteristic diagram of Embodiment 6 of the present invention Configuration diagram of portable wireless terminal according to Embodiment 7 of the present invention Radiation characteristic diagram of Embodiment 7 of the present invention Configuration diagram of portable radio terminal according to embodiment 8 of the present invention Configuration diagram when the portable wireless terminal according to the ninth embodiment of the present invention is opened The block diagram when the portable radio | wireless terminal of Embodiment 9 of this invention is closed Radiation characteristic diagram when the portable wireless terminal according to the ninth embodiment of the present invention is closed Conventional Folding Type Mobile Radio Telephone Antenna Configuration Diagram Radiation characteristics diagram of conventional folding portable wireless telephone antenna in 900MHz band Radiation characteristics diagram of conventional folding portable wireless telephone antenna at 1900 MHz band

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st element 2 2nd element 3 Feeding point 4 Feeding line 5 Radio | wireless part 7 1st housing | casing 8 2nd housing | casing 9 Slot 10, 11 Short-circuit switch for antenna switching 12 Short-circuit switch for frequency switching 13 Short-circuiting circuit for slot length switching 14 Directional switching short-circuit switch 15 Switching control unit 16 Open / close detection unit

Claims (3)

The first casing, the second casing, and a ground plane or a conductive casing, the first element provided in the first casing, the ground plane or a conductive casing, and the second casing folding constituting a second element provided in the housing, the dipole antenna by a feeding point provided at a position other than the center of the base plate or the housing be between the first element and the second element A portable wireless terminal, wherein a slot based on the feeding point is formed on the first element or the second element, and power is fed between the first element and the second element. A foldable portable wireless terminal. 2. The foldable portable radio terminal according to claim 1, wherein the slot extends in a longitudinal direction of the foldable portable radio terminal with the feeding point as a base point. The folding portable radio terminal according to claim 2, wherein the shape of the slot is bent at least once.

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