EP1432068A2 - Appareil de communication sans fils avec antenne - Google Patents

Appareil de communication sans fils avec antenne Download PDF

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Publication number
EP1432068A2
EP1432068A2 EP03029217A EP03029217A EP1432068A2 EP 1432068 A2 EP1432068 A2 EP 1432068A2 EP 03029217 A EP03029217 A EP 03029217A EP 03029217 A EP03029217 A EP 03029217A EP 1432068 A2 EP1432068 A2 EP 1432068A2
Authority
EP
European Patent Office
Prior art keywords
antenna
base portion
casing
dipole antenna
opposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03029217A
Other languages
German (de)
English (en)
Other versions
EP1432068A3 (fr
Inventor
Satoshi Mizoguchi
Takashi Amano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2002367548A external-priority patent/JP3824579B2/ja
Priority claimed from JP2003196034A external-priority patent/JP3746281B2/ja
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP1432068A2 publication Critical patent/EP1432068A2/fr
Publication of EP1432068A3 publication Critical patent/EP1432068A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/22—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element
    • H01Q19/24—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element the primary active element being centre-fed and substantially straight, e.g. H-antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole

Definitions

  • the present invention relates to a wireless communication apparatus including an antenna.
  • a mobile telephone apparatus when used for talking, is positioned near the head of the user. If a radiation pattern of an antenna built in the mobile telephone apparatus has such a pattern as to have a peak toward the vicinity of the user's head, the radiation characteristics of the antenna would greatly be affected and varied, for example, by the presence of the user's head that is present near the mobile telephone apparatus.
  • Jpn. Pat. Appln. KOKAI Publication No. 2002-9534 (Document 1) and Jpn. Pat. Appln. KOKAI Publication No. 2001-339215 (Document 2) disclose prior-art techniques for overcoming this drawback.
  • FIG. 1 is a perspective view showing the structure of a mobile telephone apparatus disclosed in Document 1.
  • Document 2 discloses an antenna comprising a pair of a dipole antenna and a parasitic element and another pair of a dipole antenna and a parasitic element. The two pairs are arranged such that the parasitic elements are sandwiched between the dipole antennas, or vice versa.
  • the amount of current on the PCB-GND flowing in the casing of the wireless apparatus is reduced and degradation in characteristics due to the effect of the human body is alleviated.
  • Japanese Patent No. 3356363 Document 3
  • Jpn. Pat. Appln. KOKAI Publication No. 2002-344222 Document 4
  • Japanese Patent No. 3356363 Document 3
  • Jpn. Pat. Appln. KOKAI Publication No. 2002-344222 Document 4
  • the object of the present invention is to provide a mobile phone apparatus including an antenna that is capable of suppressing radiation in a specific direction and can efficiently be included in a thin shaped casing.
  • a wireless communication apparatus that performs wireless communication, the apparatus having a casing with a first surface, an external dimension of the casing in a direction perpendicular to the first surface being less than an external direction of the casing in another direction, the wireless communication apparatus characterized in that comprising: a dipole antenna including a first base portion; and an opposed element formed of a conductor material and including a second base portion, the dipole antenna and the opposed element being disposed within the casing such that the dipole antenna and the opposed element extend in an imaginary plane that is substantially parallel to the first surface, and the first base portion and the second base portion are opposed to each other.
  • a wireless communication apparatus that performs wireless communication, the apparatus having a first casing and a second casing that are coupled to each other, the first casing having a first surface and such a shape that an external dimension of the first casing in a direction perpendicular to the first surface is less than an external direction of the first casing in another direction, and the second casing having a second surface and such a shape that an external dimension of the second casing in a direction perpendicular to the second surface is less than an external direction of the second casing in another direction, the wireless communication apparatus being characterized by comprising: a dipole antenna including a first base portion, the dipole antenna being disposed within the first casing such that the dipole antenna extends in an imaginary plane that is substantially parallel to the first surface and the second surface; and an opposed element formed of a conductor material and including a second base portion, the opposed element being disposed within the second casing such that the opposed element extends in the imaginary plane and the second base portion is opposed to the
  • a wireless communication apparatus that performs wireless communication, the apparatus having a first casing and a second casing that are coupled to each other, and a flexible board that electrically connects the first casing and the second casing, the first casing having a first surface and such a shape that an external dimension of the first casing in a direction perpendicular to the first surface is less than an external direction of the first casing in another direction, the wireless communication apparatus being characterized by comprising: a dipole antenna including a first base portion, the dipole antenna being disposed within the first casing such that the dipole antenna extends in an imaginary plane that is substantially parallel to the first surface; and an opposed element formed of a conductor material and including a second base portion, the opposed element being disposed on the flexible board such that the second base portion is opposed to the first base portion.
  • a mobile telephone apparatus according to a first embodiment of the present invention will now be described with reference to FIG. 3 through FIG. 6.
  • the mobile telephone apparatus has an antenna 2 built in a casing 1.
  • the antenna 2 includes a dipole antenna 3 and an opposed element 4.
  • Each of the dipole antenna 3 and opposed element 4 is formed of a conductor material in a straight shape.
  • the length of the dipole antenna 3 is equal to a half wavelength.
  • Power feed means 6 feeds power to a substantially middle point of the dipole antenna 3 in a balanced-feed fashion.
  • the dipole antenna 3, as a single element functions as a half-wave dipole antenna.
  • the dipole antenna 3 and opposed element 4 are arranged with a predetermined distance L1.
  • Each of the dipole antenna 3 and opposed element 4 is disposed in a right-and-left direction.
  • the distance L1 is 1/4 wavelength ( ⁇ /4) or less.
  • the dipole antenna 3 and opposed element 4 are in line-symmetry with respect to an opposed axis A1.
  • the opposed axis A1 is parallel to the dipole antenna 3 and opposed element 4 and is located at a middle point between the dipole antenna 3 and opposed element 4.
  • the dipole antenna 3 and opposed element 4 are in line-symmetry with respect to a symmetric axis A2.
  • the symmetric axis A2 intersects the dipole antenna 3 at right angles at a midpoint in the longitudinal direction of the dipole antenna 3.
  • the dipole antenna 3 and opposed element 4 are arranged such that an imaginary plane in which the dipole antenna 3 and opposed element 4 are positioned is parallel to the front surface of the casing 1 (the surface on which the receiver 5 is disposed).
  • an imaginary plane is shown as being superposed on the front surface of the casing 1. This is for easy understanding of the relationships between the imaginary plane and the front surface of the casing 1. It should be noted that the imaginary plane may be arranged at any position such as a position in front of the casing 1 or a position behind the casing 1. The same is applied to the analogous Figures described later.
  • a drive current vector V occurs in the dipole antenna 3, as shown in FIG. 4.
  • an induction current vector Vi which is induced by the drive current vector V and has a phase opposite to the phase of the drive current vector V, is caused in the opposed element 4.
  • the antenna 2 emits radiation by the drive current vector V and induction current vector Vi.
  • the radiation pattern of the antenna 2 When the radiation pattern of the antenna 2 is viewed from the left side of the casing 1, it looks like a simple figure eight, which is substantially symmetric with respect to the front-and-rear axis, as shown in FIG. 5.
  • the reason for this is that the current vectors V and Vi have opposite phases and thus the energy radiated from the dipole antenna 3 and the energy radiated from the opposed element 4 cancel each other in the vicinity of the center in the front-and-rear direction.
  • the distance L1 between the dipole antenna 3 and opposed element 4 decreases, the electromagnetic field radiated in the forward or rearward direction of the casing 1 is more suppressed.
  • the antenna 2 is reduced in size.
  • a circuit board, etc. are, in many cases, disposed in parallel to the antenna 2. In such a case, radiation directed to the circuit board, etc. may considerably be lost due to attenuation by the circuit board, etc. According to the first embodiment, however, an electromagnetic field that is radiated toward the rear side where the circuit board, etc. are disposed is suppressed, and thus the loss due to the circuit board, etc. can be suppressed.
  • the opposed element 4 may be inclined relative to the dipole antenna 3.
  • the imaginary plane in which the dipole antenna 3 and opposed element 4 are positioned may be inclined relative to the front surface of the casing 1.
  • the dipole antenna 3 and opposed element 4 may not be in line-symmetry with respect to the opposed axis A1.
  • the dipole antenna 3 and opposed element 4 may not be in line-symmetry with respect to the symmetric axis A2.
  • the length of the dipole antenna 3 may be an odd-number of times of a half wavelength. It should be noted, however, that as the degree of parallelism or symmetry becomes lower, the symmetric property of the radiation pattern is degraded. Thus, in the case where a regular radiation pattern is required, it is desirable to maximize the degree of parallelism or symmetry.
  • the degree of parallelism or symmetry is considerably lowered, the characteristics of the radiation pattern are maintained. It is also possible to adjust the directivity by varying the degree of parallelism or symmetry. In general terms, it is preferable for the use of the mobile telephone apparatus to obtain a relatively high radiation intensity in the direction of the angle of elevation of the casing 1. The degree of parallelism or symmetry can be adjusted so as to obtain such a radiation pattern.
  • the length of the dipole antenna 3 may be an odd-number of times of a half length.
  • the optimal length of the dipole antenna 3 is an odd-number of times of a half length.
  • the optimal length of the dipole antenna 3 is slightly different from an odd-number of times of a half length.
  • the distance L1 between the dipole antenna 3 and opposed element 4 may be made greater than ⁇ /4.
  • the dipole antenna 3 and opposed element 4 may be inclined relative to the lateral direction.
  • FIGS. 7 and 8 the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes an antenna 2 having the same structure as the antenna of the first embodiment.
  • the dipole antenna 3 and opposed element 4 are arranged so as to extend in the up-and-down direction.
  • the dipole antenna 3 and opposed element 4 in the first embodiment are horizontally situated.
  • the radiation electromagnetic field is mainly composed of a horizontally polarized wave component, and a vertically polarized wave component is relatively small.
  • the mobile telephone apparatus of the second embodiment when the radiation pattern of the antenna 2 is viewed from the upper side of the casing 1, it looks like a simple figure eight, which is substantially symmetric with respect to the front-and-rear axis, as shown in FIG. 8. Since the drive current vector V and induction current vector Vi are substantially vertical, the vertically polarized wave component can be made greater than the horizontally polarized wave component.
  • the structure of the second embodiment can similarly be modified like the first embodiment. In the second embodiment, however, if the practicability of the mobile telephone apparatus is taken into account, it is desirable to maintain the symmetric property of the radiation pattern.
  • FIGS. 9 and 10 the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus has an antenna 7 built in the casing 1.
  • the antenna 7 includes a dipole antenna 8 and an opposed element 4.
  • the dipole antenna 8 is substituted for the dipole antenna 3 of the antenna 2.
  • the dipole antenna 8 is configured such that both end portions of the conductor of the dipole antenna 3 are bent at right angles.
  • a middle portion of the dipole antenna 8 is referred to as a base portion 8a.
  • the portions bent perpendicular to the base portion 8a are referred to as bent portions 8b and 8c.
  • the length of the dipole antenna 8 is equal to a half wavelength.
  • the power feed means 6 feeds power to a substantially middle point of the dipole antenna 8.
  • the dipole antenna 8 as a single element, functions as a half-wave dipole antenna.
  • the dipole antenna 8 and opposed element 4 are disposed such that the base portion 8a and opposed element 4 have the same positional relationship as the dipole antenna 3 and opposed element 4 in the first embodiment.
  • the dipole antenna 8 is disposed such that its bent portions 8b and 8c are situated away from the opposed element 4.
  • the dipole antenna 8 and opposed element 4 are arranged such that the imaginary plane in which these elements are positioned is parallel to the front surface of the casing 1.
  • a drive current vector Va occurs in the base portion 8a
  • a drive current vector Vb occurs in the bent portion 8b
  • a drive current vector Vc occurs in the bent portion 8c, as shown in FIG. 10.
  • An induction current vector Vi which is induced by the drive current vector Va and has a phase opposite to the phase of the drive current vector Va, is caused in the opposed element 4.
  • the antenna 7 emits electromagnetic field radiation, which is similar with the first embodiment, by the drive current vector Va and induction current vector Vi.
  • the drive current vectors Vb and Vc occur in the up-and-down direction and have mutually opposite phases. Accordingly, the functions of the drive current vectors Vb and Vc are substantially equivalent to those of the drive current vectors V and Vi in the second embodiment.
  • the horizontally polarized wave component is mainly radiated by the functions of the drive current vector Va and induction current vector Vi
  • the vertically polarized wave component is mainly radiated by the functions of the drive current vectors Vb and Vc.
  • both polarized wave components can sufficiently be radiated.
  • Which of the horizontally and vertically polarized wave components is dominant is determined by the ratio in length between the base portion 8a and the bent portion 8b, 8c of the dipole antenna 8.
  • the structure of the third embodiment may be modified as in the first embodiment.
  • FIGS. 12 and 13 A mobile telephone apparatus according to a fourth embodiment of the present invention will now be described with reference to FIG. 12 and FIG. 13.
  • FIGS. 12 and 13 the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the opposed element 10 is configured such that both end portions of the conductor of the opposed element 4 are bent at right angles.
  • a middle portion of the opposed element 10 is referred to as a base portion 10a.
  • the portions bent perpendicular to the base portion 10a are referred to as bent portions 10b and 10c.
  • the dipole antenna 8 and opposed element 10 are disposed such that the base portion 8a and the base portion 10a have the same positional relationship as the dipole antenna 3 and opposed element 4 in the first embodiment.
  • the dipole antenna 8 and opposed element 10 are disposed such that the bent portions 8b and 8c and the bent portions 10b and 10c are situated away from each other.
  • the dipole antenna 8 and opposed element 10 are arranged such that the imaginary plane in which these elements are positioned is parallel to the front surface of the casing 1.
  • the antenna 9 emits electromagnetic field radiation, which is similar with the first embodiment, by the functions of the drive current vector Va and induction current vector Via.
  • the drive current vectors Vb and Vc and induction current vectors Vib and Vic occur in the up-and-down direction.
  • the drive current vector Vb and induction current vector Vib have the same direction, and the drive current vector Vc and induction current vector Vic have the same direction.
  • the drive current vector Vb and induction current vector Vib have opposite phases, and the drive current vector Vc and induction current vector Vic have opposite phases.
  • the horizontally polarized wave component is mainly radiated by the functions of the drive current vector Va and induction current vector Via
  • the vertically polarized wave component is mainly radiated by the functions of the drive current vectors Vb and Vc and the induction current vectors Vib and Vic.
  • the structure of the fourth embodiment can also be modified like the first embodiment.
  • FIG. 14 A mobile telephone apparatus according to a fifth embodiment of the present invention will now be described with reference to FIG. 14.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus according to the fifth embodiment has an antenna 9 having the same structure as the antenna 9 of the first embodiment.
  • the base portions 8a and 10a are disposed in the up-and-down direction.
  • the vertically polarized wave component is mainly radiated by the functions of the drive current vector Va and induction current vector Vi
  • the horizontally polarized wave component is mainly radiated by the functions of the drive current vectors Vb and Vc and the induction current vectors Vib and Vic.
  • the structure of the fifth embodiment can also be modified like the first embodiment. It is desirable, however, that the base portions 8a and 10a be disposed in line-symmetry with respect to the opposed axis A1 in order to maintain the symmetric property of the vertically polarized wave component in the left-and-right axial direction.
  • the mobile telephone apparatus according to the sixth embodiment is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 11 which is obtained by modifying the antenna 9.
  • the antenna 11 includes a dipole antenna 12 and the opposed element 10. Specifically, the antenna 11 includes the dipole antenna 12 in place of the dipole antenna 8 of the antenna 9.
  • the dipole antenna 12 like the dipole antenna 8, is formed of a conductor material so as to have a base portion 12a and bent portions 12b and 12c.
  • the bent portions 12b and 12c are opened outward, while being line-symmetric with respect to the symmetric axis A2.
  • the radiation pattern mainly comprising the vertically polarized wave component can be kept symmetric with respect to the front-and-rear axis.
  • the dipole antenna 12 and opposed element 10 are not in line-symmetry with respect to the opposed axis A1. Consequently, the radiation pattern mainly comprising the horizontally polarized wave component is not symmetric with respect to the up-and-down axial direction. It should be noted, however, that the feature that there is no radiation directivity toward the front or the rear remains unchanged. As a result, the same advantages as with the first embodiment can be obtained.
  • the radiation directivity of the horizontally polarized wave component in the up-and-down axial direction can be optimized by properly determining the angle of the bent portion 12b, 12c.
  • the structure of the sixth embodiment may be modified as in the first embodiment.
  • FIG. 16 shows only the structure of an antenna 13 built in the mobile telephone apparatus according to the seventh embodiment.
  • the mobile telephone apparatus according to the seventh embodiment is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 13 which is obtained by modifying the antenna 9.
  • the antenna 11 includes a dipole antenna 14 and an opposed element 15.
  • the opposed element 15, like the opposed element 10, is formed so as to have a base portion 15a and bent portions 15b and 15c.
  • the base portion 15a has such a bent shape that the base portion 15a gradually approaches the dipole antenna 14 from its middle point toward its both ends.
  • the base portion 14a and base portion 15a are line-symmetric with respect to the opposed axis A1.
  • the structure of the seventh embodiment may be modified as in the first embodiment.
  • FIG. 17 shows only the structure of an antenna 16 that is built in the mobile telephone apparatus according to the eighth embodiment.
  • the mobile telephone apparatus according to the eighth embodiment is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 16 which is obtained by modifying the antenna 9.
  • the antenna 16 includes a dipole antenna 17 and an opposed element 18.
  • the dipole antenna 17 is formed by adding a shorting element 17a of a conductor material to the dipole antenna 8.
  • the shorting element 17a short-circuits the bent portions 8b and 8c.
  • the opposed element 18 is formed by adding a shorting element 18a of a conductor material to the opposed element 10.
  • the shorting element 18a short-circuits the bent portions 10b and 10c.
  • the antenna 16 has an impedance that varies depending on the distance between the base portion 8a and shorting element 17a and the distance between the base portion 10a and shorting element 18a. By properly determining these distances, impedance matching can be effected between the power feed means 6 and antenna 16.
  • the structure of the eighth embodiment may be modified as in the first embodiment.
  • the mobile telephone apparatus according to the ninth embodiment is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 19 which is obtained by modifying the antenna 9.
  • the antenna 19 is formed by adding shorting elements 20 and 21 of conductor material to the antenna 9.
  • the shorting elements 20 and 21 short-circuit the dipole antenna 8 and opposed element 10.
  • the antenna 22 shown in FIG. 19 is a variation of the antenna 19.
  • the antenna 22 includes shorting elements 23 and 24 formed of conductor material in the same shape as the dipole antenna 8 and opposed element 10.
  • the shorting element 23 short-circuits the bent portions 8b and 10b, and the shorting element 24 short-circuits the bent portions 8c and 10c.
  • reference numeral 25 denotes a board accommodated in the casing 1 along with the antenna 22.
  • the antenna 22 has a current distribution as shown in FIG. 20A.
  • the antenna 9 has a current distribution as shown in FIG. 20B.
  • the degrees of current balance in FIGS. 20A and 20B are 95% and 81%, respectively. That is, the current distribution in the antenna 22 has a higher degree of current balance than the current distribution in the antenna 9.
  • a null appears clearly in the radiation pattern of the antenna 22, as viewed from the upper side of the casing 1.
  • the forward direction corresponds to the direction of 0 degree (i.e. the right-hand direction of the horizontal axis).
  • the radiation pattern shown in FIG. 21 it is understood that a null of the vertically polarized wave component indicated by the solid line is formed in good condition in the forward direction.
  • the addition of the shorting elements 23 and 24 increases the impedance.
  • the PCB-GND provided at the board 25 is situated close to the antenna 22, the impedance matching can be achieved.
  • the shape of the shorting elements and the locations of connection of the shorting elements to the dipole antenna 8 and opposed element 10 can freely be chosen. It is desirable, however, to maintain the symmetry with respect to the symmetric axis A2.
  • the mobile telephone apparatus according to the tenth embodiment is based on the mobile telephone apparatus according to the fourth embodiment.
  • the mode of power feed is altered. Specifically, power feed means 26 is added.
  • the power feed means 26 feeds power to the opposed element 10 with a phase that is opposite to the phase of the power feed means 6.
  • This mode of power feed is also applicable to a configuration that is based on embodiments other than the fourth embodiment of the present invention.
  • FIG. 25 A mobile telephone apparatus according to an eleventh embodiment of the present invention will now be described with reference to FIG. 25.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus according to the eleventh embodiment is based on the mobile telephone apparatus according to the fourth embodiment.
  • the mode of power feed is altered. Specifically, the position of the power feed means 6 is displaced from the middle point of the base portion 8a.
  • the drive current vector Vb in the bent portion 8b and the drive current vector Vc in the bent portion 8c can maintain the relationship of opposite phases, as far as the dipole antenna 8 is configured to have a proper length based on an odd-number of times of ⁇ /2. Therefore, the same advantages as with the fourth embodiment can be achieved.
  • This mode of power feed is also applicable to a configuration that is based on embodiments other than the fourth embodiment of the present invention.
  • FIG. 26 A mobile telephone apparatus according to a twelfth embodiment of the present invention will now be described with reference to FIG. 26.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 27 which is obtained by modifying the antenna 9.
  • the antenna 27 includes a dipole antenna 28 and the opposed element 10. Specifically, the antenna 27 includes the dipole antenna 28 in place of the dipole antenna 8 of the antenna 9.
  • the dipole antenna 28 is formed as a conductor pattern on a board 29 that is built in the casing 1.
  • the dipole antenna 28 includes a base portion 28a and bent portions 28b and 28c.
  • the shape and the position of the dipole antenna 28 are the same as those of the dipole antenna 8.
  • the dipole antenna 28 can be formed at the same time. If the board 29 is mounted in the casing 1, the dipole antenna 28 can also be mounted. In addition, if the opposed element 10 is disposed in the casing 1, the antenna 27 can be formed. Thus, the mobile telephone apparatus according to the twelfth embodiment can efficiently be manufactured.
  • FIG. 27 A mobile telephone apparatus according to a 13th embodiment of the present invention will now be described with reference to FIG. 27.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes an upper casing 30 and a lower casing 31 that are configured to be foldable by means of a hinge (not shown). Electric circuits accommodated in the upper casing 30 and lower casing 31 are electrically connected by means of a connection member 32 such as a flexible board.
  • the upper casing 30 contains the antenna 9.
  • the antenna 9 is configured such that the imaginary plane in which the dipole antenna 8 and opposed element 10 are positioned is parallel to the front surface of the upper casing 30.
  • This mode of mounting is also applicable to a configuration that is based on embodiments other than the fourth embodiment of the present invention.
  • the structure of the 13th embodiment may be modified as in the first embodiment.
  • FIG. 28 A mobile telephone apparatus according to a 14th embodiment of the present invention will now be described with reference to FIG. 28.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • This mode of mounting is also applicable to the case of using antennas according to embodiments other than the fourth embodiment of the present invention.
  • the structure of the 14th embodiment may be modified as in the first embodiment.
  • FIG. 29 A mobile telephone apparatus according to a 15th embodiment of the present invention will now be described with reference to FIG. 29.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes the upper casing 30 and lower casing 31, like the 13th embodiment. Electric circuits accommodated in the upper casing 30 and lower casing 31 are electrically connected by means of a connection member 33 such as a flexible board.
  • the mobile telephone apparatus includes an antenna 34 that is formed by modifying the antenna 9 of the fourth embodiment.
  • the antenna 34 includes the dipole antenna 8 and an opposed element 35.
  • the antenna 34 includes the opposed element 35 that is substituted for the opposed element 10 of the antenna 9.
  • the opposed element 35 is formed as a conductor pattern on the connection member 33.
  • the opposed element 35 includes a base portion 35a and bent portions 35b and 35c.
  • the opposed element 35 has the same shape as the opposed element 10.
  • the imaginary plane in which the base portion 35a and bent portions 35b and 35c of the opposed element 35 are positioned is parallel to the front surface of the upper casing 30 in the state in which the upper casing 30 and lower casing 31 are opened, as shown in FIG. 29.
  • the same advantages as with the fourth embodiment can be obtained.
  • the size of the casing can further be reduced.
  • the structure of the 15th embodiment may be modified as in the first embodiment.
  • the dipole antenna 8 may be accommodated in the upper casing 30. It is possible that the dipole antenna is formed of a conductor pattern on the connection member and the opposed element 35 is accommodated in the upper casing 30 or lower casing 31. Both the dipole antenna and opposed element may be formed of conductor patterns on the connection member.
  • the antenna in each of the first to 15th embodiments is basically composed of a balanced-type dipole antenna, and an opposed element is additionally provided.
  • a current decreases, which flows, according to radiation from the antenna, on the board accommodated in the casing along with the antenna.
  • VSWR voltage standing-wave ratio
  • FIG. 30 and FIG. 31 show experimental values of VSWR relating to this mobile wireless communication terminal.
  • the VSWR characteristics do not greatly vary between the following states: a state (Free) in which the mobile wireless communication terminal is disposed in a free space, a state (Hand) in which the lower casing 31 is held by the hand, and a state (Head) in which the lower casing 31 is held by the hand and the upper casing 30 is positioned close to the head.
  • the VSWR characteristics do not greatly vary between the following states: a state (OPEN) in which the upper casing 30 and lower casing 31 are opened and a state (CLOSE) in which the upper casing 30 and lower casing 31 are closed.
  • FIG. 32 and FIG. 33 the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes an antenna 36 built in the casing 1.
  • the antenna 36 includes the dipole antenna 3, the opposed element 4, and parasitic elements 37 and 38.
  • the antenna 36 is formed by adding parasitic elements 37 and 38 to the antenna 2 of the first embodiment.
  • the parasitic elements 37 and 38 are formed of conductor material in a straight shape. The length of each parasitic element 37, 38 differs from that of the dipole antenna 3. In FIG. 32, each parasitic element 37, 38 is shorter than the dipole antenna 3. The parasitic elements 37 and 38 are disposed in the imaginary plane in which the dipole antenna 3 and opposed element 4 are positioned. The parasitic element 37 is spaced apart from the dipole antenna 3 by a predetermined distance L2 and is parallel to the dipole antenna 3. The parasitic element 38 is spaced apart from the opposed element 4 by a predetermined distance L3 and is parallel to the opposed element 4. The distance L2, L3 is ⁇ /4 or less.
  • the parasitic element 38, opposed element 4, dipole antenna 3 and parasitic element 37 are arranged in the named order in the up-and-down direction of the casing 1 at intervals of ⁇ /4 or less.
  • the parasitic elements 37 and 38 are configured to be in line-symmetry with respect to the symmetric axis A2.
  • a drive current vector V occurs in the dipole antenna 3, as shown in FIG. 33.
  • An induction current vector Vi1 which is induced by the drive current vector V and has a phase opposite to the phase of the drive current vector V, is caused in the opposed element 4.
  • the antenna 36 emits radiation by the drive current vector V and induction current vectors Vi1, Vi2 and Vi3.
  • the radiation pattern of the antenna 36 When the radiation pattern of the antenna 36 is viewed from the left side of the casing 1, it looks like a simple figure eight, which is substantially symmetric with respect to the front-and-rear axis, as shown in FIG. 34.
  • the reason for this is that the current vectors v and Vi1 have opposite phases and thus the energy radiated from the dipole antenna 3 and the energy radiated from the opposed element 4 cancel each other in the vicinity of the center in the front-and-rear direction.
  • the dipole antenna 3 and opposed element 4 Since the dipole antenna 3 and opposed element 4 are disposed in the right-and-left direction of the casing 1, the horizontally polarized wave component is dominant, relative to the vertically polarized wave component. Since the dipole antenna 3 and opposed element 4 are configured to be in line-symmetry with respect to the symmetric axis A2, the radiation pattern (not shown) as viewed from the front side of the casing 1 is symmetric in the right-and-left direction.
  • a VSWR with reference to the power feed means 6, which relates to only the functions of the dipole antenna 3 and opposed element 4, has characteristics as shown by a broken line in FIG. 35.
  • single-peak frequency characteristics with a first resonance point are obtained.
  • the frequency at the first resonance point is determined by the length of the dipole antenna 3.
  • a VSWR which relates to only the functions of the parasitic elements 37 and 38, also has single-peak frequency characteristics.
  • the parasitic element 37, 38 has a length different from the length of the dipole antenna 6, a second resonance point with a frequency different from the frequency of the first resonance point occurs depending on the functions of the parasitic elements 37 and 38. If the parasitic element 37, 38 is shorter than the dipole antenna 6, as shown in FIG. 32, the second resonance point has a higher frequency than the first resonance point.
  • the VSWR of the antenna 36 has frequency characteristics that are obtained by compounding these two characteristics. That is, double-peak frequency characteristics are obtained as shown by a solid line in FIG. 35.
  • FIG. 35 shows the displacement in a larger scale than the actual one.
  • the antenna 36 has a broader frequency band than the antenna 2 of the first embodiment which comprises only the dipole antenna 3 and opposed element 4.
  • the addition of the parasitic elements 37 and 38 makes the size of the antenna 36 larger than the antenna 2.
  • the antenna 36 since the parasitic elements 37 and 38 are disposed in the same imaginary plane as the dipole antenna 3 and opposed element 4, the antenna 36, like the antenna 2, has a thin external shape along the front surface of the casing 1.
  • the casing 1 is formed to have a thin shape with a small thickness in the front-and-rear direction, the antenna 36 can efficiently be accommodated in the casing 1. Therefore, it is possible to obtain a mobile telephone apparatus which has a small size and can decrease degradation in communication performance due to the close positional relationship between the human body and the front surface of the casing 1.
  • the parasitic element 37, 38 may be longer than the dipole antenna 3.
  • the second resonance point has a lower frequency than the first resonance point.
  • the distance L2, L3 may be greater than ⁇ /4.
  • the direction of the dipole antenna 3 and opposed element 4 may be inclined relative to the right-and-left direction.
  • the antenna 36 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 36 A mobile telephone apparatus according to a 17th embodiment of the present invention will now be described with reference to FIG. 36.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes an antenna 39 that is built in the casing 1.
  • the antenna 39 includes the dipole antenna 8, opposed element 10, and parasitic elements 37 and 38.
  • the antenna 39 is formed by adding parasitic elements 37 and 38 to the antenna 9 of the fourth embodiment.
  • the parasitic element 37, 38 is shorter than the base portion 8a.
  • the parasitic element 37 is disposed such that the relationship between the base portion 8a and parasitic element 37 coincides with the relationship between the dipole antenna 3 and parasitic element 37 in the 16th embodiment.
  • the parasitic element 38 is disposed such that the relationship between the base portion 10a and parasitic element 38 coincides with the relationship between the opposed element 10 and parasitic element 38 in the 16th embodiment.
  • the antenna 39 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 39 emits radiation, similarly with the fourth embodiment, by the functions of the drive current vector occurring in the dipole antenna 8 and the induction current vector occurring in the opposed element 10. On the other hand, the antenna 39 emits radiation, similarly with the 16th embodiment, by the functions of the induction current vectors occurring in the parasitic elements 37 and 38. In addition, since the parasitic element 37, 38 is shorter than the dipole antenna 8, the VSWR of the antenna 39 has double-peak frequency characteristics for the same reason as has been stated in connection with the 16th embodiment.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 17th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 39 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 37 A mobile telephone apparatus according to an 18th embodiment of the present invention will now be described with reference to FIG. 37.
  • the structural elements common to those shown in the preceding Figures are denoted by like reference numerals, and a detailed description thereof is omitted.
  • the mobile telephone apparatus includes an antenna 40 that is built in the casing 1.
  • the antenna 40 includes the dipole antenna 8, opposed element 10, and parasitic elements 37 and 38.
  • the antenna 40 is formed by adding parasitic elements 37 and 38 to the antenna 9 of the fourth embodiment.
  • the parasitic element 37, 38 is shorter than the dipole antenna 8.
  • the parasitic elements 37 and 38 are arranged to sandwich the dipole antenna 8 and opposed element 10.
  • the parasitic element 37 is disposed in parallel to the bent portions 8b and 10b.
  • the parasitic element 38 is disposed in parallel to the bent portions 8c and 10c.
  • the parasitic elements 37 and 38 are disposed in the imaginary plane in which the dipole antenna 8 and opposed element 10 are positioned.
  • the antenna 40 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 40 emits radiation, similarly with the fourth embodiment, by the functions of the drive current vector occurring in the dipole antenna 8 and the induction current vector occurring in the opposed element 10. On the other hand, the antenna 40 emits radiation, similarly with the 16th embodiment, by the functions of the induction current vectors occurring in the parasitic elements 37 and 38. In addition, since the parasitic element 37, 38 is shorter than the dipole antenna 8, the VSWR of the antenna 40 has double-peak frequency characteristics for the same reason as has been stated in connection with the 16th embodiment.
  • the direction of the parasitic elements 37 and 38 is rotated by 90° relative to the direction of the parasitic elements 37 and 38 in the 16th or 17th embodiment. That is, the parasitic elements 37 and 38 are disposed in the up-and-down direction.
  • the second resonance point appears conspicuously in the vertically polarized wave component in the 18th embodiment, while it appears conspicuously in the horizontally polarized wave component in the 16th or 17th embodiment.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 18th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 40 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 38 shows only the structure of an antenna 41 built in the mobile telephone apparatus according to the 19th embodiment.
  • the mobile telephone apparatus according to the 19th embodiment is based on the mobile telephone apparatus according to the fourth embodiment, and it includes the antenna 41 which is obtained by modifying the antenna 9.
  • the antenna 41 includes the dipole antenna 8, opposed element 10, and parasitic elements 42 and 43. Specifically, the antenna 41 is formed by adding the parasitic elements 42 and 43 to the antenna 9.
  • the parasitic element 42 is formed of a conductor material so as to have a base portion 42a and bent portions 42b and 42c.
  • the base portion 42a and bent portions 42b and 42c are shorter than the base portion 8a and bent portions 8b and 8c, respectively.
  • the parasitic element 42 is disposed inside the dipole antenna 8 such that the base portion 42a and bent portions 42b and 42c are parallel to the base portion 8a and bent portions 8b and 8c, respectively.
  • the parasitic element 43 like the opposed element 10, is formed of a conductor material so as to have a base portion 43a and bent portions 43b and 43c.
  • the base portion 43a and bent portions 43b and 43c are shorter than the base portion 10a and bent portions 10b and 10c, respectively.
  • the parasitic element 43 is disposed inside the opposed element 10 such that the base portion 43a and bent portions 43b and 43c are situated parallel to the base portion 10a and bent portions 10b and 10c, respectively.
  • the parasitic elements 42 and 43 are disposed in the imaginary plane in which the dipole antenna 8 and opposed element 10 are positioned.
  • the parasitic elements 42 and 43 are in line-symmetry with respect to the symmetric axis A2.
  • the antenna 41 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 41 emits radiation, similarly with the fourth embodiment, by the functions of the drive current vector occurring in the dipole antenna 8 and the induction current vector occurring in the opposed element 10.
  • the antenna 41 since the induction current vectors occurring in the parasitic elements 42 and 43 have opposite phases, the antenna 41 emits radiation by functions similar to the functions of the drive current vector occurring in the dipole antenna 8 and the induction current vector occurring in the opposed element 10.
  • the parasitic element 42, 43 is shorter than the dipole antenna 8, the VSWR of the antenna 41 has double-peak frequency characteristics for the same reason as has been stated in connection with the 16th embodiment.
  • the base portion 42a of parasitic element 42 is perpendicular to the bent portions 42b and 42c, and the base portion 43a of parasitic element 43 is perpendicular to the bent portions 43b and 43c.
  • the second resonance point appears conspicuously in each of the vertically polarized wave component and horizontally polarized wave component.
  • the vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 19th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 41 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 39 shows only the structure of an antenna 44 that is built in the mobile telephone apparatus according to the 20th embodiment.
  • the antenna 44 includes the same elements as those of the antenna 39 of the 17th embodiment.
  • the parasitic elements 37 and 38 are disposed along the base portions 8a and 10a in an imaginary plane that is different from the imaginary plane in which the dipole antenna 8 and opposed element 10 are positioned.
  • Each of the parasitic elements 37 and 38 is line-symmetric with respect to a symmetric axis A3.
  • the symmetric axis A3 is parallel to the symmetric axis A2 with a distance of ⁇ /4 or less in the forward direction.
  • the imaginary planes in which the symmetric axes A2 and A3 are positioned are referred to as a first imaginary plane and a second imaginary plane, respectively.
  • the antenna 44 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 44 emits radiation similarly with the 17th embodiment.
  • the dipole antenna 8 and opposed element 10 are disposed in the first imaginary plane, and the parasitic elements 37 and 38 are disposed in the second imaginary plane, the first and second imaginary planes being arranged in the front-and-rear direction. Consequently, the thickness of the antenna 44 in the front-and-rear direction becomes larger than that of the antenna 39 of the 17th embodiment.
  • the distance between the first and second imaginary planes can be set at ⁇ /4 or less, the thickness of the casing 1 in the front-and-rear direction is not greatly increased.
  • the inside areas of the dipole antenna 8 and opposed element 10 can effectively be used for disposing other components, the thickness of the casing 1 may possibly be reduced by devising arrangement of other components.
  • the structure of the 20th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the first imaginary plane and the second imaginary plane may be reversely positioned in the front-and-rear direction.
  • the second imaginary plane may be inclined relative to the first imaginary plane. It should be noted, however, that as the degree of parallelism between the first and second imaginary planes becomes lower, the symmetric property of the radiation pattern is degraded. Thus, in the case where a regular radiation pattern is required, it is desirable to maximize the degree of parallelism between the first and second imaginary planes.
  • the antenna 44 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 40 shows only the structure of an antenna 45 that is built in the mobile telephone apparatus according to the 21st embodiment.
  • the mobile telephone apparatus includes the antenna 45 built in the casing 1.
  • the antenna 45 includes the dipole antenna 8, opposed element 10, and parasitic elements 37 and 38.
  • the antenna 45 includes the same elements as those of the antenna 40 of the 18th embodiment.
  • the parasitic elements 37 and 38 are disposed along the bent portions 8b and 10b and the bent portions 8c and 10c, respectively.
  • the parasitic elements 37 and 38 are line-symmetric with respect to the symmetric axis A3.
  • the antenna 45 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 45 emits radiation similarly with the 18th embodiment.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 21st embodiment may be modified as in the first embodiment, the 16th embodiment or the 20th embodiment.
  • the antenna 45 may be contained in the upper casing 30 or the lower casing 31.
  • the mobile telephone apparatus includes the antenna 46 built in the casing 1.
  • the antenna 46 includes the dipole antenna 8, opposed element 10, and parasitic elements 42 and 43.
  • the antenna 46 includes the same elements as those of the antenna 41 of the 19th embodiment.
  • the parasitic elements 42 and 43 are disposed in the second imaginary plane.
  • the parasitic elements 42 and 43 are line-symmetric with respect to the symmetric axis A3.
  • the antenna 46 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 46 emits radiation similarly with the 19th embodiment.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 22nd embodiment may be modified as in the first embodiment, the 16th embodiment or the 20th embodiment.
  • FIG. 42 shows only the structure of an antenna 47 that is built in the mobile telephone apparatus according to the 23rd embodiment.
  • the mobile telephone apparatus includes the antenna 47 built in the casing 1.
  • the antenna 47 includes a dipole antenna 48, an opposed element 49, and parasitic elements 50 and 51.
  • the dipole antenna 48, opposed element 49 and parasitic elements 50 and 51 are all formed of flat-plate conductor materials.
  • the dipole antenna 48 is formed to have a base portion 48a and bent portions 48b and 48c.
  • the bent portions 48b and 48c are bent from both ends of the base portion 48a at right angles and extend in the same direction.
  • a major surface of the base portion 48a faces in the front-and-rear direction.
  • Major surfaces of the bent portions 48b and 48c face in the right-and-left direction.
  • the opposed element 49 is configured to have a base portion 49a and bent portions 49b and 49c
  • the parasitic element 50 is configured to have a base portion 50a and bent portions 50b and 50c
  • the parasitic element 51 is configured to have a base portion 51a and bent portions 51b and 51c.
  • the dipole antenna 48, opposed element 49 and parasitic elements 50 and 51 are disposed with the same positional relationship as the dipole antenna 8, opposed element 10 and parasitic elements 42 and 43 in the 19th embodiment.
  • the base portions 48a, 49a, 50a and 51a are disposed in the same imaginary plane, and the bent portions 48b, 48c, 49b, 49c, 50b, 50c, 51b and 51c are disposed in the same direction.
  • the antenna 47 When power is fed to the dipole antenna 48 from the power feed means 6, the antenna 47 emits radiation similarly with the 19th embodiment.
  • the bent portions 48b, 48c, 49b, 49c, 50b, 50c, 51b and 51c are projected rearward, relative to the base portions 48a, 49a, 50a and 51a. Consequently, the thickness of the antenna 47 in the front-and-rear direction is larger than that of the antenna 41 of the 19th embodiment.
  • the antenna 47 can efficiently be accommodated in the casing 1 by arranging the bent portions 48b, 48c, 49b, 49c, 50b, 50c, 51b and 51c along the side faces of the casing 1. Thereby, the effective mounting area for disposing other components such as a display can be increased.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 23rd embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the bent portions 48b, 48c, 49b, 49c, 50b, 50c, 51b and 51c may be projected forward, relative to the base portions 48a, 49a, 50a and 51a.
  • the major surfaces of the base portions 48a, 49a, 50a and 51a may not be at right angles with the major surfaces of the bent portions 48b, 48c, 49b, 49c, 50b, 50c, 51b and 51c.
  • the antenna 47 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 43 shows only the structure of an antenna 52 that is built in the mobile telephone apparatus according to the 24th embodiment.
  • the mobile telephone apparatus includes the antenna 52 built in the casing 1.
  • the antenna 52 includes a dipole antenna 53, an opposed element 54, and parasitic elements 55 and 56.
  • the dipole antenna 53, opposed element 54 and parasitic elements 55 and 56 are all formed of flat-plate conductor materials.
  • the dipole antenna 53 is formed to have a base portion 53a and bent portions 53b and 53c.
  • the bent portions 53b and 53c are bent.from both ends of the base portion 53a at right angles and extend in the same direction.
  • a major surface of the base portion 53a faces in the up-and-down direction.
  • Major surfaces of the bent portions 53b and 53c face in the right-and-left direction.
  • the opposed element 54 is configured to have a base portion 54a and bent portions 54b and 54c
  • the parasitic element 55 is configured to have a base portion 55a and bent portions 55b and 55c
  • the parasitic element 56 is configured to have a base portion 56a and bent portions 56b and 56c.
  • the dipole antenna 53, opposed element 54 and parasitic elements 55 and 56 are disposed with the same positional relationship as the dipole antenna 8, opposed element 10 and parasitic elements 42 and 43 in the 19th embodiment.
  • the antenna 52 When power is fed to the dipole antenna 53 from the power feed means 6, the antenna 52 emits radiation similarly with the 19th embodiment.
  • the dipole antenna 53, opposed element 54 and parasitic elements 55 and 56 have thickness in the front-and-rear direction. Consequently, the thickness of the antenna 52 in the front-and-rear direction is larger than that of the antenna 41 of the 19th embodiment.
  • the antenna 52 can efficiently be accommodated in the casing 1 by arranging the bent portions 53b, 53c, 54b, 54c, 55b, 55c, 56b and 56c along the side faces of the casing 1. Thereby, the effective mounting area for disposing other components such as a display can be increased.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 24th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 52 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 44 shows only the structure of an antenna 57 that is built in the mobile telephone apparatus according to the 25th embodiment.
  • the mobile telephone apparatus includes the antenna 57 built in the casing 1.
  • the antenna 57 includes the dipole antenna 8, opposed element 10, and parasitic elements 58 and 59.
  • the antenna 57 is formed by adding the parasitic elements 58 and 59 to the antenna 9 of the fourth embodiment.
  • the parasitic element 58 is formed of a conductor material so as to have a base portion 58a, a pair of first bent portions 58b and 58c, and a pair of second bent portions 58d and 58e.
  • the base portion 58a is longer than the base portion 8a.
  • the first bent portions 58b and 58c are bent from both ends of the base portion 58a at right angles and extend in the same direction.
  • the first bent portions 58b and 58c have the same length.
  • the second bent portions 58d and 58e are bent at right angles from the ends of the first bent portions 58b and 58c and extend toward each other.
  • the parasitic element 59 like the parasitic element 58, is formed to have a base portion 59a, a pair of first bent portions 59b and 59c, and a pair of second bent portions 59d and 59e.
  • the parasitic elements 58 and 59 are arranged along the opposed axis A2.
  • An imaginary plane in which all portions of the parasitic element 58 are positioned and an imaginary plane in which all portions of the parasitic element 59 are positioned are opposed to each other. These two imaginary planes are perpendicular to the imaginary plane in which the dipole antenna 8 and opposed element 10 are positioned.
  • the bent portions 8b, 8c, 10b and 10c pass through these two imaginary planes.
  • the parasitic element 58 is line-symmetric with respect to a symmetric axis M1
  • the parasitic element 59 is line-symmetric with respect to a symmetric axis M2.
  • the symmetric axes M1 and M2 intersect at right angles with the symmetric axis A2 and extend in the front-and-rear direction.
  • the parasitic elements 58 and 59 have thickness in the front-and-rear direction. Consequently, the thickness of the antenna 57 in the front-and-rear direction is larger than that of the antenna 39 of the 17th embodiment.
  • the antenna 57 can efficiently be accommodated in the casing 1 by arranging the bent portions 58b, 58c, 58d, 58e, 59b, 59c, 59d and 59e along the side faces of the casing 1. Thereby, the effective mounting area for mounting other components such as a display can be increased.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 25th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 57 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 45 shows only the structure of an antenna 60 that is built in the mobile telephone apparatus according to the 26th embodiment.
  • the mobile telephone apparatus includes the antenna 60 built in the casing 1.
  • the antenna 60 includes the dipole antenna 8, opposed element 10, shorting elements 23 and 24, and parasitic elements 42 and 43.
  • the antenna 60 is formed by adding the parasitic elements 42 and 43 to the antenna 22 of the ninth embodiment.
  • the parasitic element 42 is disposed inside the dipole antenna 8 such that the base portion 42a and bent portions 42b and 42c are parallel to the base portion 8a and bent portions 8b and 8c, respectively.
  • the parasitic element 43 is disposed inside the opposed element 10 such that the base portion 43a and bent portions 43b and 43c are parallel to the base portion 10a and bent portions 10b and 10c, respectively.
  • the antenna 60 When power is fed to the dipole antenna 8 from the power feed means 6, the antenna 60 emits radiation, similarly with the 19th embodiment.
  • the functions of the shorting elements 23 and 24 the same advantages as with the ninth embodiment can be obtained.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 26th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 60 may be contained in the upper casing 30 or the lower casing 31.
  • FIG. 46 shows the measurement result in which two resonance points are obtained.
  • "Open” indicates a measurement result in the state in which the upper casing 30 and lower casing 31 are opened
  • “Close” indicates a measurement result in the state in which the upper casing 30 and lower casing 31 are closed.
  • a radiation pattern of the antenna 60 relating to 2170 MHz, which is a frequency near the other resonance point shown in FIG. 46 was simulated and radiation patterns as shown in FIGS. 47D, 47E and 47F were obtained.
  • the radiation patterns in FIGS. 47A and 47D were obtained with reference to the up-and-down axis.
  • the radiation patterns in FIGS. 47B and 47E were obtained with reference to the front-and-rear axis.
  • the radiation patterns in FIGS. 47C and 47F were obtained with reference to the right-and-left axis.
  • it is assumed that the antenna 60 is designed such that the vertically polarized wave component is dominant.
  • a null of a radiation pattern is created in the forward direction in each of the cases of 1920 MHz and 2170 MHz. Therefore, a decrease in radiation efficiency due to the effect of the human body can be avoided.
  • FIG. 48 and FIG. 49 show only the structure of an antenna 61, 66 built in the mobile telephone apparatus according to the 27th embodiment.
  • the wireless communication apparatus includes an antenna 61.
  • the antenna 61 includes a dipole antenna 62, an opposed element 63 and shorting elements 64 and 65.
  • the dipole antenna 62 is formed of a conductor material so as to have a base portion 62a and bent portions 62b and 62c.
  • the bent portions 62b and 62c are bent from both ends of the base portion 62a at right angles and extend in the same direction.
  • the bent portions 62b and 62c are further bent at right angles so as to extend toward each other.
  • the bent portions 62b and 62c are folded so as to extend away from each other.
  • distal end portions of the bent portions 62b and 62c are bent at right angles so as to approach the base portion 62a.
  • the opposed element 63 like the dipole antenna 62, is formed to have a base portion 63a and bent portions 63b and 63c.
  • the dipole antenna 62 and opposed element 63 are disposed such that the base portion 62a and base portion 63a have the same positional relationship as the dipole antenna 3 and opposed element 4 in the first embodiment.
  • the dipole antenna 62 and opposed element 63 are disposed such that the bent portions 62b and 62c are situated away from the bent portions 63b and 63c.
  • the dipole antenna 62 and opposed element 63 are arranged such that the imaginary plane in which the base portions 62a and 63a are positioned is parallel to the front surface of the casing 1.
  • the shorting element 64 is formed of a conductor material so as to have a pair of parallel portions 64a and 64b and a portion 64c that linearly connects both ends of the portions 64a and 64b.
  • the distance between the portions 64a and 64b is equal to the distance between the base portions 62a and 63a.
  • the shorting element 65 is formed of conductor material so as to have portions 65a, 65b and 65c.
  • the shorting elements 64 and 65 are connected to the base portions 62a and 63a so as to project rearward, relative to the base portions 62a and 63a.
  • the antenna 66 shown in FIG. 49 is a variation of the antenna 61.
  • the antenna 66 includes the dipole antenna 62, opposed element 63 and shorting elements 67 and 68. Specifically, the antenna 66 includes the shorting elements 67 and 68 in place of the shorting elements 64 and 65 of the antenna 61.
  • the shorting elements 67 and 68 are connected to the base portions 62a and 63a so as to project rearward, relative to the base portions 62a and 63a. However, the shorting elements 67 and 68 are formed so as to protrude upward and downward.
  • the line lengths of the bent portions 62b, 62c, 63b and 63c are increased and these portions are disposed along the periphery of the board 25, as shown in FIGS. 48 and 49. Thereby, these portions can efficiently be accommodated in the casing 1.
  • the shorting elements 64 and 65 and the shorting elements 67 and 68 are disposed along the periphery of the board 25, as shown in FIGS. 48 and 49. Thereby, these shorting elements can efficiently be accommodated in the casing 1.
  • the shorting element 67, 68 can have a greater line length than the shorting element 20, 21, 23, 24, 64, 65.
  • both the horizontally polarized wave component and vertically polarized wave component can fully be radiated, and a broad frequency band is realized.
  • the structure of the 27th embodiment may be modified as in the first embodiment or the 16th embodiment.
  • the antenna 61, 66 may be contained in the upper casing 30 or the lower casing 31.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP03029217.1A 2002-12-19 2003-12-18 Appareil de communication sans fils avec antenne Withdrawn EP1432068A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002367548 2002-12-19
JP2002367548A JP3824579B2 (ja) 2002-12-19 2002-12-19 アンテナ装置、携帯無線通信装置及び接続部材
JP2003196034 2003-07-11
JP2003196034A JP3746281B2 (ja) 2003-07-11 2003-07-11 アンテナ装置及び携帯無線通信装置

Publications (2)

Publication Number Publication Date
EP1432068A2 true EP1432068A2 (fr) 2004-06-23
EP1432068A3 EP1432068A3 (fr) 2014-03-26

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EP03029217.1A Withdrawn EP1432068A3 (fr) 2002-12-19 2003-12-18 Appareil de communication sans fils avec antenne

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007000461A1 (fr) * 2005-06-27 2007-01-04 Etilux S.A. Ensemble d'un support metallique et d'un dispositif emetteur-recepteur.
WO2007118824A2 (fr) * 2006-04-18 2007-10-25 Palm, Inc. Terminal mobile pour au moins la réception ou la transmission de transmissions sans fil, notamment pour la réception de programmes multimédia
EP1887649A1 (fr) * 2005-06-02 2008-02-13 Matsushita Electric Industrial Co., Ltd. Appareil portable sans fil
EP1901395A1 (fr) * 2005-07-07 2008-03-19 Matsushita Electric Industrial Co., Ltd. Dispositif sans fil portable
EP1942553A1 (fr) * 2006-12-29 2008-07-09 Delta Networks, Inc. Structure d'antenne et procédé pour augmenter sa largeur de bande
US20110312393A1 (en) * 2010-06-18 2011-12-22 Motorola, Inc. Antenna system with parasitic element for hearing aid compliant electromagnetic emission

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6046703A (en) * 1998-11-10 2000-04-04 Nutex Communication Corp. Compact wireless transceiver board with directional printed circuit antenna
EP1154513A1 (fr) * 1999-12-24 2001-11-14 Matsushita Electric Industrial Co., Ltd. Antenne constituee d'un terminal de communication radio
JP2002152353A (ja) * 2000-11-13 2002-05-24 Samsung Yokohama Research Institute Co Ltd 携帯端末機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6046703A (en) * 1998-11-10 2000-04-04 Nutex Communication Corp. Compact wireless transceiver board with directional printed circuit antenna
EP1154513A1 (fr) * 1999-12-24 2001-11-14 Matsushita Electric Industrial Co., Ltd. Antenne constituee d'un terminal de communication radio
JP2002152353A (ja) * 2000-11-13 2002-05-24 Samsung Yokohama Research Institute Co Ltd 携帯端末機

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1887649A4 (fr) * 2005-06-02 2009-02-18 Panasonic Corp Appareil portable sans fil
US7616161B2 (en) 2005-06-02 2009-11-10 Panasonic Corporation Portable wireless apparatus
EP1887649A1 (fr) * 2005-06-02 2008-02-13 Matsushita Electric Industrial Co., Ltd. Appareil portable sans fil
WO2007000461A1 (fr) * 2005-06-27 2007-01-04 Etilux S.A. Ensemble d'un support metallique et d'un dispositif emetteur-recepteur.
EP1901395A1 (fr) * 2005-07-07 2008-03-19 Matsushita Electric Industrial Co., Ltd. Dispositif sans fil portable
EP1901395A4 (fr) * 2005-07-07 2010-02-03 Panasonic Corp Dispositif sans fil portable
WO2007118824A3 (fr) * 2006-04-18 2008-04-10 Benq Mobile Gmbh & Co Ohg Terminal mobile pour au moins la réception ou la transmission de transmissions sans fil, notamment pour la réception de programmes multimédia
WO2007118824A2 (fr) * 2006-04-18 2007-10-25 Palm, Inc. Terminal mobile pour au moins la réception ou la transmission de transmissions sans fil, notamment pour la réception de programmes multimédia
EP1942553A1 (fr) * 2006-12-29 2008-07-09 Delta Networks, Inc. Structure d'antenne et procédé pour augmenter sa largeur de bande
US20110312393A1 (en) * 2010-06-18 2011-12-22 Motorola, Inc. Antenna system with parasitic element for hearing aid compliant electromagnetic emission
US8483415B2 (en) * 2010-06-18 2013-07-09 Motorola Mobility Llc Antenna system with parasitic element for hearing aid compliant electromagnetic emission
US20130273963A1 (en) * 2010-06-18 2013-10-17 Motorola Mobiltiy LLC Antenna system with parasitic element for hearing aid compliant electromagnetic emission
US8605922B2 (en) * 2010-06-18 2013-12-10 Motorola Mobility Llc Antenna system with parasitic element for hearing aid compliant electromagnetic emission

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