EP0415703B1 - Antenna system for portable radio apparatus - Google Patents
Antenna system for portable radio apparatus Download PDFInfo
- Publication number
- EP0415703B1 EP0415703B1 EP90309385A EP90309385A EP0415703B1 EP 0415703 B1 EP0415703 B1 EP 0415703B1 EP 90309385 A EP90309385 A EP 90309385A EP 90309385 A EP90309385 A EP 90309385A EP 0415703 B1 EP0415703 B1 EP 0415703B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- construction
- casing
- antenna construction
- radio apparatus
- 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.)
- Expired - Lifetime
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- 238000010276 construction Methods 0.000 claims description 70
- 230000005855 radiation Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 2
- 238000013459 approach Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000001394 sodium malate Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
- H01Q1/084—Pivotable antennas
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- 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
-
- 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
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- 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
-
- 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
Definitions
- the present invention relates to an antenna system and, more particularly, to an antenna system for a portable radio telephone or similar portable radio apparatus.
- the antenna may be bodily removed from the portable radio apparatus to allow the apparatus to be carried in a smaller configuration. This, however, brings about a problem that mounting and dismounting the antenna is troublesome, and a problem that the antenna physically separated from the apparatus can easily be lost. Moreover, the radio apparatus is practically unable to transmit or receive a radio signal without the antenna.
- the antenna may be provided with a foldable structure to reduce the length of the radio apparatus.
- a drawback with the foldable antenna scheme is that, in the folded position, the radiation characteristics of the antenna are effected by a shield structure and a printed circuit board which are usually incorporated in a radio apparatus, obstructing adequate transmission and reception. In addition, the antenna exposed to the outside at all times is not desirable for cosmetic reasons.
- a telescopic antenna is another scheme for enhancing the portability of a portable radio apparatus. This type of antenna is telescoped into the casing, of the apparatus when a small antenna gain suffices.
- a telescopic antenna lacks sufficient mechanical strength since the diameter thereof is extremely small at the tip. Such an antenna also requires an extra space for its accommodation in the casing of the apparatus, thus obstructing the miniaturization of the apparatus. Further, the radiation characteristics of the antenna are critically degraded when the antenna is telescopically retracted.
- an antenna for a portable radio apparatus which miniaturizes and enhances the portability of the apparatus without being removed from the apparatus, which preserves desirable radiation characteristics thereof even when brought to an easy-to-carry position, and which has an attractive appearance.
- An antenna system for a portable radio apparatus which will be described below has a base plate or earth plate incorporated in the casing of the apparatus, a first antenna construction having an antenna element thereinside, and a second antenna construction.
- the first antenna construction has a movable joint which allows it to move between a first position where it forms a part of the contour of the apparatus and a second position where it protrudes from the contour of the apparatus.
- the second antenna construction corrects the antenna radiation characteristics and matching characteristics of the antenna.
- the second antenna construction is affixed to the earth plate inside the casing.
- a portable radio apparatus embodying the present invention which includes a casing 11.
- a first antenna construction 12 is mechanically connected to the casing 11 and constitutes a major element of the antenna of the apparatus.
- the first antenna construction 12 has an antenna element 13 which is the main element of an antenna reflector, and a movable joint 14 which serves as a part of the antenna reflector as well.
- Incorporated in the casing 11 are a transmitter-receiver 15, an antenna feeder 16 interconnecting the transmitter-receiver 15 and the movable joint 14, a base plate or ground (earth) plate 17, and a second antenna construction 18.
- the transmitter-receiver 15 has an antenna duplexer 19, a transmitting portion 20, a receiving portion 21, and a control portion 22 for controlling the transmitting and receiving portions 20 and 21.
- the radio apparatus may further include a power supply portion and a dialling unit, not shown.
- the first antenna construction 12 is movable between two different positions, i.e., a first position where the first antenna construction 12 is formed as a part of the contour of a casing 11 (Fig. 1(a)) and a second position where it is protruded from the casing 11 (Fig. 1(b)).
- the first antenna construction 12 forms a part of the contour of the radio apparatus which is mainly defined by the casing 11.
- the antenna element 13 is positioned close to the earth plate 17 which is incorporated in the casing 11 and has ground potential as shown in Fig. 1(a), and that the second antenna construction 18 is absent.
- the antenna characteristics of the radio apparatus such as the antenna gain and radiation impedance would be changed and degraded, compared to the characteristics under the condition wherein the antenna element 13 is regarded as existing in free space.
- the second antenna construction 18 serves to correct such antenna characteristics which would otherwise be degraded. Affixed to the earth plate 17, the second antenna construction 18 is so positioned, shaped and dimensioned as to implement adequate correction, which will be described in detail.
- the first antenna construction 12 may be rotated by the movable joint 14 to the second position where it protrudes from the contour of the casing 11.
- the joint 14 is of the type having a rotatable shaft, as well known in the art.
- Fig. 1(b) does not show the internal arrangement of the casing 11 for clarity, it shows a specific configuration of the antenna element 13 which is disposed in the first antenna construction 12.
- the antenna element 13 is provided with a helical whip structure implemented with a metallic wire.
- the antenna element 13 and the antenna construction 18 are spaced apart from each other and, therefore, electrically sparingly coupled with each other. It follows that the antenna characteristics of the radio apparatus are substantially determined by the characteristics of the antenna element 13. In the condition shown in Fig. 1(b), the antenna characteristics may be determined with no regard to the characteristics of the second antenna construction 18.
- Fig. 3 shows in detail the first and second antenna constructions 12 and 18 determining the major characteristics of the antenna, and the earth plate 17.
- the antenna construction has the antenna element 13 implemented with a metallic wire, a cover 23 made of a plastic or similar dielectric substance for protecting the antenna element 13, and the movable joint 14.
- the casing 11 made of a plastic or similar substance is so configured and positioned as to isolate the first antenna construction 12 from the earth plate 17 and the second antenna construction 18.
- the antenna feeder 16 is electrically connected at one end to the movable joint 14 and at the other end to the duplexer 19, Fig. 2.
- the movable joint 14 is made of a metal and electrically connects the antenna element and feeder 13 and 16.
- the movable joint 14 also mechanically fixes the casing 11 and the first antenna construction 18.
- the developed length of the helical antenna element 13 is substantially one-fourth of the wavelength of the frequency used. Adjustment is made such that substantially optimal antenna characteristics are set up when the first antenna construction 12 is positioned as shown in Fig. 1(b). It is to be noted that the influence of the casing 11 and cover 23 on the antenna characteristics is negligible so long as they have a minimum of losses and are thin. On the other hand, when the antenna construction 12 is laid down to the position shown in Fig. 1(a), the antenna characteristics are noticeably effected. Specifically, should the second antenna construction 18 be absent, the first antenna gain would be reduced by more than 20 dB, compared to that in free space.
- the second antenna construction 18 comprises a metallic wire which is electrically connected to the earth plate 17 at one end thereof.
- the second antenna construction 18 is shaped, dimensioned and positioned in consideration of a necessary frequency and the band thereof, such that the first antenna construction 12 is adequately matched.
- the second antenna construction 18 may be provided with a rectangular ring-like configuration and located in close proximity to the open end of the antenna element 13. This ring-like configuration is successful in reducing the distance between the earth plate 17 and the first antenna construction 12 and thereby the overall dimensions of the radio apparatus.
- the second antenna construction 18 may be affixed to the earth plate 17 by a fixing member made of a plastic, for example.
- the second antenna construction 18 plays the role of an inductance element and, therefore, compensates for a, capacitance component ascribable to the position of the first antenna construction 12 close to the earth plate 17.
- the structure and electric characteristics of the second antenna construction 18 described above are only illustrative and may be selected in matching relation to the characteristics of the first antenna construction 12 and required antenna characteristics.
- the earth plate 17 may be configured such that a part thereof forms a structural element of the first antenna construction 12.
- Figs. 4(a) and 4(b) are representative of the results of specific measurements associated with the positions shown in Figs. 1(a) and 1(b), respectively.
- the average gain Gav was measured to be -4.8 dBd (dBd: antenna gain normalized by dipole antenna gain) in the position of Fig. 1(a) and -3.5 dBd in the position of Fig. 1(b).
- dBd antenna gain normalized by dipole antenna gain
- This embodiment also has a first antenna construction 51 which is movable between two different positions, i.e., a first position where it is nested in a casing 52 (Fig. 5(a)) and a second position where it is protruded from the casing 52 (Fig. 5(b)).
- the first antenna construction 51 bas thereinside an antenna element 53 having a flat plate-like configuration.
- a sliding mechanism 54 which per se is conventional is used to allow the antenna construction to move between the two positions as mentioned above.
- the first antenna construction 51 and a second antenna construction 55 which determine the major characteristics of the antenna of the radio apparatus are shown in Fig. 6 in detail, together with a base plate or earth plate 56.
- the antenna construction 51 has an antenna element 53, a cover 57 made of a plastic for protecting the antenna element 53, and one part of the slide mechanism 54.
- the casing 52 isolates the second antenna construction 55 and earth plate 56 from the first antenna construction 51.
- An antenna feeder 58 is connected in the neighborhood of a side of the flat antenna element 53.
- the total length of the sides of the antenna element 53 is selected to be substantially one-half of the wavelength of the frequency used.
- the second antenna construction 55 is mechanically affixed and electrically connected to the earth plate 56 at a position which is substantially one-fourth of the wavelength as measured from the side of the antenna element 53 which is closest to the position where the antenna feeder 58 is connected. More specifically, this position corresponds to the open end of the flat antenna and allows antenna matching to be set up most easily.
- the second antenna construction 55 like the antenna construction 18 shown in Fig. 1, is implemented with a ring-like metallic wire which constitutes an inductance element. Again, as the antenna element 53 is moved toward the earth plate 56, the resulting capacitance component is compensated for by the second antenna construction 55. This is successful in preventing the antenna gain of the antenna of the radio equipment from being lowered.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
- Transceivers (AREA)
Description
- The present invention relates to an antenna system and, more particularly, to an antenna system for a portable radio telephone or similar portable radio apparatus.
- With a portable radio apparatus such as a portable radio telephone, it is desirable from the portability standpoint that when transmission or reception is not effected or is effected at low levels, a regular antenna be received in the casing of the apparatus to reduce the overall dimensions of the apparatus. An implementation for receiving the antenna as mentioned has been proposed in various forms in the past, as follows.
- Specifically, the antenna may be bodily removed from the portable radio apparatus to allow the apparatus to be carried in a smaller configuration. This, however, brings about a problem that mounting and dismounting the antenna is troublesome, and a problem that the antenna physically separated from the apparatus can easily be lost. Moreover, the radio apparatus is practically unable to transmit or receive a radio signal without the antenna.
- The antenna may be provided with a foldable structure to reduce the length of the radio apparatus. A drawback with the foldable antenna scheme is that, in the folded position, the radiation characteristics of the antenna are effected by a shield structure and a printed circuit board which are usually incorporated in a radio apparatus, obstructing adequate transmission and reception. In addition, the antenna exposed to the outside at all times is not desirable for cosmetic reasons.
- Another implementation heretofore proposed is such that when the radio equipment is not operated or is operated at low levels, the regular antenna is retracted into the casing of the apparatus and switched to a built-in or internal antenna. This approach, however, is not practicable without resorting to two independent antennas and a switch for switching them over. This, coupled with the fact that a mechanism for interlocking the antenna switching operations is indispensable, results in the need for substantial space, impeding the miniaturization of such a radio apparatus. Further, the extra switch aggravates the high-frequency losses of signals. The radio apparatus with this antenna switching scheme would be complicated in structure and, therefore, expensive.
- A telescopic antenna is another scheme for enhancing the portability of a portable radio apparatus. This type of antenna is telescoped into the casing, of the apparatus when a small antenna gain suffices. A telescopic antenna, however, lacks sufficient mechanical strength since the diameter thereof is extremely small at the tip. Such an antenna also requires an extra space for its accommodation in the casing of the apparatus, thus obstructing the miniaturization of the apparatus. Further, the radiation characteristics of the antenna are critically degraded when the antenna is telescopically retracted.
- In the specification of United States Patent No. 4,860,024, which was published on August 22 1989, there was proposed a portable radio telephone with a main antenna element which can be accommodated within a casing and an auxiliary antenna element electrically connected to the main antenna element when the main antenna element is in the casing.
- In Vol 9 No. 258 (E-350)(1981) October 16 1985 and Japanese Patent No. 60/107903 in the name of Zeneraru Research OBU Erekutoronitsukusu K.K. which was published on June 13 1985, there was proposed a radio equipment with an extendable rod antenna so arranged that in its retracted condition, its outer sleeve was coupled electrostatically to a grounded part of the receiver to increase the effective capacitance of the antenna.
- Features of the present invention are the provision of an antenna for a portable radio apparatus which miniaturizes and enhances the portability of the apparatus without being removed from the apparatus, which preserves desirable radiation characteristics thereof even when brought to an easy-to-carry position, and which has an attractive appearance.
- An antenna system for a portable radio apparatus which will be described below has a base plate or earth plate incorporated in the casing of the apparatus, a first antenna construction having an antenna element thereinside, and a second antenna construction. The first antenna construction has a movable joint which allows it to move between a first position where it forms a part of the contour of the apparatus and a second position where it protrudes from the contour of the apparatus. When the first antenna construction is in the first position, the second antenna construction corrects the antenna radiation characteristics and matching characteristics of the antenna. The second antenna construction is affixed to the earth plate inside the casing.
- The following description and drawings disclose, by means of an example, the invention which is characterised in the appended claims, whose terms determine the extent of protection conferred hereby. In the drawings:-
- Figs. 1(a) and 1(b) are perspective views each showing a portable radio apparatus embodying the present invention in a particular position;
- Fig. 2 is a block diagram schematically showing circuitry incorporated in the radio apparatus of Figs. 1(a) and 1(b);
- Fig. 3 is a fragmentary perspective view showing an antenna portion of the embodiment in detail;
- Fig. 4(a) and 4(b) are charts representative of antenna radiation characteristics particular to the embodiment;
- Fig. 5(a) and 5(b) are perspective views each showing an alternative embodiment of the present invention in a particular position; and
- Fig. 6 is a fragmentary perspective view showing an antenna portion of the alternative embodiment in detail.
- Referring to Figs. 1(a) and 1(b) and 2, a portable radio apparatus embodying the present invention is shown which includes a casing 11. A
first antenna construction 12 is mechanically connected to the casing 11 and constitutes a major element of the antenna of the apparatus. Thefirst antenna construction 12 has anantenna element 13 which is the main element of an antenna reflector, and amovable joint 14 which serves as a part of the antenna reflector as well. Incorporated in the casing 11 are a transmitter-receiver 15, anantenna feeder 16 interconnecting the transmitter-receiver 15 and themovable joint 14, a base plate or ground (earth)plate 17, and asecond antenna construction 18. Generally, the transmitter-receiver 15 has anantenna duplexer 19, a transmittingportion 20, a receivingportion 21, and acontrol portion 22 for controlling the transmitting and receivingportions first antenna construction 12 is movable between two different positions, i.e., a first position where thefirst antenna construction 12 is formed as a part of the contour of a casing 11 (Fig. 1(a)) and a second position where it is protruded from the casing 11 (Fig. 1(b)). - As shown in Fig. 1(a), the
first antenna construction 12 forms a part of the contour of the radio apparatus which is mainly defined by the casing 11. Assume that theantenna element 13 is positioned close to theearth plate 17 which is incorporated in the casing 11 and has ground potential as shown in Fig. 1(a), and that thesecond antenna construction 18 is absent. Then, the antenna characteristics of the radio apparatus such as the antenna gain and radiation impedance would be changed and degraded, compared to the characteristics under the condition wherein theantenna element 13 is regarded as existing in free space. Thesecond antenna construction 18 serves to correct such antenna characteristics which would otherwise be degraded. Affixed to theearth plate 17, thesecond antenna construction 18 is so positioned, shaped and dimensioned as to implement adequate correction, which will be described in detail. - As shown in Fig. 1 (b), the
first antenna construction 12 may be rotated by themovable joint 14 to the second position where it protrudes from the contour of the casing 11. Thejoint 14 is of the type having a rotatable shaft, as well known in the art. While Fig. 1(b) does not show the internal arrangement of the casing 11 for clarity, it shows a specific configuration of theantenna element 13 which is disposed in thefirst antenna construction 12. Specifically, theantenna element 13 is provided with a helical whip structure implemented with a metallic wire. In the second position shown in Fig. 1(b), theantenna element 13 and theantenna construction 18 are spaced apart from each other and, therefore, electrically sparingly coupled with each other. It follows that the antenna characteristics of the radio apparatus are substantially determined by the characteristics of theantenna element 13. In the condition shown in Fig. 1(b), the antenna characteristics may be determined with no regard to the characteristics of thesecond antenna construction 18. - Fig. 3 shows in detail the first and
second antenna constructions earth plate 17. As shown, the antenna construction has theantenna element 13 implemented with a metallic wire, acover 23 made of a plastic or similar dielectric substance for protecting theantenna element 13, and themovable joint 14. The casing 11 made of a plastic or similar substance is so configured and positioned as to isolate thefirst antenna construction 12 from theearth plate 17 and thesecond antenna construction 18. Theantenna feeder 16 is electrically connected at one end to themovable joint 14 and at the other end to theduplexer 19, Fig. 2. Themovable joint 14 is made of a metal and electrically connects the antenna element andfeeder movable joint 14 also mechanically fixes the casing 11 and thefirst antenna construction 18. The developed length of thehelical antenna element 13 is substantially one-fourth of the wavelength of the frequency used. Adjustment is made such that substantially optimal antenna characteristics are set up when thefirst antenna construction 12 is positioned as shown in Fig. 1(b). It is to be noted that the influence of the casing 11 andcover 23 on the antenna characteristics is negligible so long as they have a minimum of losses and are thin. On the other hand, when theantenna construction 12 is laid down to the position shown in Fig. 1(a), the antenna characteristics are noticeably effected. Specifically, should thesecond antenna construction 18 be absent, the first antenna gain would be reduced by more than 20 dB, compared to that in free space. This may be accounted for by the radiation impedance which, as theantenna element 13 approaches theearth plate 17, decreases due to the resultant increase in the capacitance between theelement 13 and theplate 17. Thesecond antenna construction 18 comprises a metallic wire which is electrically connected to theearth plate 17 at one end thereof. Thesecond antenna construction 18 is shaped, dimensioned and positioned in consideration of a necessary frequency and the band thereof, such that thefirst antenna construction 12 is adequately matched. For example, thesecond antenna construction 18 may be provided with a rectangular ring-like configuration and located in close proximity to the open end of theantenna element 13. This ring-like configuration is successful in reducing the distance between theearth plate 17 and thefirst antenna construction 12 and thereby the overall dimensions of the radio apparatus. Thesecond antenna construction 18 may be affixed to theearth plate 17 by a fixing member made of a plastic, for example. In such a configuration, thesecond antenna construction 18 plays the role of an inductance element and, therefore, compensates for a, capacitance component ascribable to the position of thefirst antenna construction 12 close to theearth plate 17. It will be noted that the structure and electric characteristics of thesecond antenna construction 18 described above are only illustrative and may be selected in matching relation to the characteristics of thefirst antenna construction 12 and required antenna characteristics. Further, theearth plate 17 may be configured such that a part thereof forms a structural element of thefirst antenna construction 12. - Figs. 4(a) and 4(b) are representative of the results of specific measurements associated with the positions shown in Figs. 1(a) and 1(b), respectively. As shown, when the frequency was 962 MHz, the average gain Gav was measured to be -4.8 dBd (dBd: antenna gain normalized by dipole antenna gain) in the position of Fig. 1(a) and -3.5 dBd in the position of Fig. 1(b). With the illustrative embodiment, therefore, it is possible to suppress the decrease in antenna gain to 1.3 dB even when the
first antenna construction 12 is brought to the position where it is regarded as forming a part of the contour of the radio apparatus. - Referring to Figs. 5(a) and 5(b), an alternative embodiment of the present invention will be described. This embodiment also has a
first antenna construction 51 which is movable between two different positions, i.e., a first position where it is nested in a casing 52 (Fig. 5(a)) and a second position where it is protruded from the casing 52 (Fig. 5(b)). In the illustrative embodiment, thefirst antenna construction 51 bas thereinside anantenna element 53 having a flat plate-like configuration. A slidingmechanism 54 which per se is conventional is used to allow the antenna construction to move between the two positions as mentioned above. - The
first antenna construction 51 and asecond antenna construction 55 which determine the major characteristics of the antenna of the radio apparatus are shown in Fig. 6 in detail, together with a base plate orearth plate 56. As shown, theantenna construction 51 has anantenna element 53, acover 57 made of a plastic for protecting theantenna element 53, and one part of theslide mechanism 54. Thecasing 52 isolates thesecond antenna construction 55 andearth plate 56 from thefirst antenna construction 51. Anantenna feeder 58 is connected in the neighborhood of a side of theflat antenna element 53. The total length of the sides of theantenna element 53 is selected to be substantially one-half of the wavelength of the frequency used. Thesecond antenna construction 55 is mechanically affixed and electrically connected to theearth plate 56 at a position which is substantially one-fourth of the wavelength as measured from the side of theantenna element 53 which is closest to the position where theantenna feeder 58 is connected. More specifically, this position corresponds to the open end of the flat antenna and allows antenna matching to be set up most easily. Thesecond antenna construction 55, like theantenna construction 18 shown in Fig. 1, is implemented with a ring-like metallic wire which constitutes an inductance element. Again, as theantenna element 53 is moved toward theearth plate 56, the resulting capacitance component is compensated for by thesecond antenna construction 55. This is successful in preventing the antenna gain of the antenna of the radio equipment from being lowered. - It will be understood that, although the invention has been described, by way of example, with reference to particular embodiments, variations and modifications thereof, as well as other embodiments may be made within the scope of the protection afforded by the appended claims.
Claims (7)
- An antenna system for a portable radio apparatus, including an earth plate (17) mounted in a casing (11) of the radio apparatus, a first antenna construction (12) having an antenna element (13) accommodated therein and extendable from the apparatus, and a second antenna construction (18) inside the casing (11), characterised in that there is provided a movable joint (14) for allowing the first antenna construction (12) to move between a first position in which the first antenna construction (12) forms a part of the contour of the casing (11) and a second position in which the first antenna construction (12) protrudes from the contour of the casing (11) and in that the second antenna construction (18) is affixed to the earth plate (17) and magneto-electrically coupled to the first antenna construction (12) to constitute a single antenna together with the first antenna construction (12) at least when the first antenna construction is in the first position, the second antenna construction (18) correcting an antenna radiation characteristic of the first antenna construction (12) when the first antenna construction (12) is in the first position.
- An antenna system as claimed in claim 1, wherein, when the first antenna construction (12) is in the first position, the second antenna construction (18) is located in close proximity to an open end of an antenna element (13) of the first antenna construction (12).
- An antenna system as claimed in either claim 1, or claim 2 wherein the antenna element (13) is a helical whip type antenna element.
- An antenna system as claimed in any one of the preceding claims wherein the earth plate (17) is flat and is configured such that a part thereof forms a structural element of the first antenna construction (12).
- An antenna system as claimed in any one of the preceding claims, wherein the second antenna construction (18) includes a ring-like metal wire.
- An antenna system as claimed in any one of the preceding claims, wherein the movable joint (14) allows the first antenna construction (12) to rotate about one of its ends.
- An antenna system as claimed in any one of claims 1 to 5, wherein the movable joint (14) allows the first antenna construction (12) to slide on the casing (11) .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22346089 | 1989-08-29 | ||
JP223460/89 | 1989-08-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0415703A1 EP0415703A1 (en) | 1991-03-06 |
EP0415703B1 true EP0415703B1 (en) | 1995-01-04 |
Family
ID=16798498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90309385A Expired - Lifetime EP0415703B1 (en) | 1989-08-29 | 1990-08-28 | Antenna system for portable radio apparatus |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0415703B1 (en) |
JP (2) | JP2919024B2 (en) |
KR (1) | KR920010205B1 (en) |
AU (1) | AU640404B2 (en) |
CA (1) | CA2024180C (en) |
DE (1) | DE69015739T2 (en) |
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GB2257838B (en) * | 1991-07-13 | 1995-06-14 | Technophone Ltd | Retractable antenna |
FR2701613B1 (en) * | 1993-02-11 | 1995-03-31 | Alcatel Radiotelephone | Portable radiotelephone transceiver. |
TW295733B (en) * | 1994-09-15 | 1997-01-11 | Motorola Inc | |
US5561437A (en) * | 1994-09-15 | 1996-10-01 | Motorola, Inc. | Two position fold-over dipole antenna |
US5892483A (en) * | 1996-03-15 | 1999-04-06 | Ericsson Inc. | Dual antenna arrangement for portable transceiver |
DE19723331B4 (en) * | 1997-06-04 | 2010-11-11 | Ipcom Gmbh & Co. Kg | radio set |
WO2000005780A1 (en) * | 1998-07-20 | 2000-02-03 | Samsung Electronics Company, Limited | Portable reception indicator for satellite radio-navigation systems |
JP2000106502A (en) * | 1998-07-27 | 2000-04-11 | Hoko Denshi Kk | Antenna for radio equipment |
JP3180784B2 (en) * | 1998-11-17 | 2001-06-25 | 日本電気株式会社 | Portable terminal device having a reflector |
US6249688B1 (en) * | 1998-12-21 | 2001-06-19 | Ericcson Inc. | Antenna electrical coupling configurations |
US6232924B1 (en) | 1998-12-21 | 2001-05-15 | Ericsson Inc. | Flat blade antenna and flip mounting structures |
US6301489B1 (en) | 1998-12-21 | 2001-10-09 | Ericsson Inc. | Flat blade antenna and flip engagement and hinge configurations |
JP3665239B2 (en) * | 1999-09-29 | 2005-06-29 | 松下電器産業株式会社 | Antenna device and card type radio |
KR20020065717A (en) * | 2001-02-07 | 2002-08-14 | 삼성전자 주식회사 | Antenna device for portablel radiotelephone |
KR20020053690A (en) * | 2001-04-12 | 2002-07-05 | 장응순 | Swing antenna for cellular phone |
KR100492197B1 (en) * | 2002-09-09 | 2005-05-30 | 주식회사 팬택 | An Antenna structure for Specific Absorption Ratio of mibile phone |
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US20080231520A1 (en) * | 2007-03-22 | 2008-09-25 | Zueck Joseph | Modem card with three-dimensional antenna arrangement |
JP6496939B2 (en) | 2014-07-07 | 2019-04-10 | ソニー株式会社 | Mounting table, communication device, antenna characteristic correction member, and communication system |
CN110416690A (en) * | 2018-04-28 | 2019-11-05 | Oppo广东移动通信有限公司 | The control method of electronic device and electronic device |
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US4121218A (en) * | 1977-08-03 | 1978-10-17 | Motorola, Inc. | Adjustable antenna arrangement for a portable radio |
US4313119A (en) * | 1980-04-18 | 1982-01-26 | Motorola, Inc. | Dual mode transceiver antenna |
JPH01105237U (en) * | 1987-12-28 | 1989-07-14 | ||
JPH0812970B2 (en) * | 1988-07-05 | 1996-02-07 | 日本電気株式会社 | Portable wireless communication device |
US4868576A (en) * | 1988-11-02 | 1989-09-19 | Motorola, Inc. | Extendable antenna for portable cellular telephones with ground radiator |
-
1990
- 1990-08-28 CA CA002024180A patent/CA2024180C/en not_active Expired - Fee Related
- 1990-08-28 JP JP2226196A patent/JP2919024B2/en not_active Expired - Lifetime
- 1990-08-28 EP EP90309385A patent/EP0415703B1/en not_active Expired - Lifetime
- 1990-08-28 DE DE69015739T patent/DE69015739T2/en not_active Expired - Lifetime
- 1990-08-29 AU AU61925/90A patent/AU640404B2/en not_active Expired
- 1990-08-29 KR KR1019900013360A patent/KR920010205B1/en not_active IP Right Cessation
-
1998
- 1998-09-07 JP JP25258398A patent/JP3202690B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69015739D1 (en) | 1995-02-16 |
CA2024180A1 (en) | 1991-03-01 |
JPH03219703A (en) | 1991-09-27 |
JP3202690B2 (en) | 2001-08-27 |
JPH11186824A (en) | 1999-07-09 |
CA2024180C (en) | 1995-06-13 |
EP0415703A1 (en) | 1991-03-06 |
KR920010205B1 (en) | 1992-11-21 |
KR910005511A (en) | 1991-03-30 |
JP2919024B2 (en) | 1999-07-12 |
AU6192590A (en) | 1991-03-07 |
DE69015739T2 (en) | 1995-08-17 |
AU640404B2 (en) | 1993-08-26 |
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