WO2001022527A1 - Antenna device for a radio communications device - Google Patents
Antenna device for a radio communications device Download PDFInfo
- Publication number
- WO2001022527A1 WO2001022527A1 PCT/SE2000/001826 SE0001826W WO0122527A1 WO 2001022527 A1 WO2001022527 A1 WO 2001022527A1 SE 0001826 W SE0001826 W SE 0001826W WO 0122527 A1 WO0122527 A1 WO 0122527A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- supporting means
- conductive
- semi
- radiating
- electrically conductive
- Prior art date
Links
Classifications
-
- 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
-
- 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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
-
- 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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
Definitions
- the present invention generally relates to the field of external antennas and particularly to an antenna device with improved near field radiation characteristics, and to a radio communications device comprising said antenna device.
- Mobile telephones generally exchange radio signals with a radio base station. Some signal exchange occurs during standby when no call is going on and the phone is located for instance in the hand, in a pocket, or at the waist of the user. Signal exchange of course occurs when a call is going on and the phone is then typically located between the ear and mouth of the user, or still in a pocket or at the waist of the user with an earpiece and a microphone connected.
- a fundamental and efficient antenna type for mobile telephone is the monopole consisting of an antenna whip having a length generally a fraction of a wavelength and a phone circuit board acting as a corresponding ground conductor. Among them a length of half a wavelength was used in many older phones and gives a very low feeding current (corresponding to high impedance) with low currents on the telephone body or circuit board.
- This type of antenna provides very low electromagnetic fields on the phone itself and thus little interaction with head, hands etc close to the phone. The size is however much bigger than complying with modern telephone design so generally much smaller antennas are required for the sake of easy handling.
- the small antenna since the small antenna has to radiate the same power as a big one (due to the requirements of the phone system) the currents or voltages (depending on the type of antenna) on the small antenna will be bigger. This is especially true when the structure is small as compared to a wavelength. Thus the possible interaction with various objects close to the antenna will inherently be bigger and so will the currents along the phone body or circuit board. This applies to all typical screeners in telephone surroundings which means that the electromagnetic fields of the antenna will interact significantly with the user's body during call mode. The interaction would generally occur during standby as well as if the phone is close to the user's body.
- SAR Specific Absorption Rate
- the present invention has the aim to provide an antenna that generally attains low POP for saving power. Naturally, there is also an aim of the present invention is to fulfil SAR regulations and any other applicable legislation as may be required in various countries.
- POP used herein has a technical and non-legal meaning. Thus it should not be confused with SAR which is a quantity of different nature.
- antenna structures isolated from the phone body would have more favourable SAR performance as many phones show maximum SAR somewhere at the phone body, due to the currents along the same.
- D is the largest measure of the radiating structure ("diameter") and for a phone (with D ranging from ⁇ /3 to ⁇ , the limits means that the "transition zone" generally vanishes.
- the near field and the far field generally are very different with a transition zone in between. Regions of high SAR values (i.e. strong fields close to the phone) may occur in different directions compared to direction of strong radiation (in the far field) .
- CA 2,088,724, DE 19518125, and DE 19600041 disclose all shielding devices comprising a two- dimensional plate, which shields the radiation towards the user.
- Such shielding means may be mounted externally with respect to the antenna, at the antenna itself or at the casing of the mobile telephone, or they may be formed integrally with the antenna or with the telephone casing.
- US 5,335,366 discloses a shielding means comprising an absorber, reflector or blocker integrally disposed on the antenna, e.g. as a coating, along the longitudinal axis thereof.
- US 5,666,125 comprises an antenna having at one side thereof an elongated shielding means disposed along the longitudinal axis of the antenna.
- An elongated element is arranged in parallel with the antenna at opposite side thereof, said element assisting in redirection of the radiation.
- WO 94/28595 describes an antenna arrangement comprising a dielectric cylinder at which four vertically extending rods are arranged, and of which rods one is an antenna element and the others are passive interconnected elements that may be grounded or left in an open circuit. The elements may operate so as to direct and/or reflect the radiation. It is mentioned that a higher degree of directionality is achieved by using grounded passive elements. Furthermore, said document discloses a further two element arrangement with one active element and one passive element connected to ground.
- US 5,826,201 discloses a vertical rod antenna and a passive rod antenna disposed parallel with each other. It is, however, not clear whether the passive element should be connected to ground or to the rod antenna, or if it should be left in open circuit.
- It is an object of the present invention to provide an antenna device comprising a dielectric supporting means mountable on a radio communications device usable to a human user, and a radiating first element operable in a first frequency band, said supporting means and said radiating first element having a common central longitudinal axis and said radiating first element being supported by said supporting means, having first and second ends being a first feed point and an open end, respectively, and being disposed at least partly around said central longitudinal axis, which device avoids at least some of the problems that is related with prior art.
- the main tool for this is to create a near field substantially different from the far field.
- An advantage of the present invention is a substantial reduction in POP, while still maintaining an antenna device geometry that provides for small sizes.
- Fig. la displays schematically a front view of an antenna device according to a first embodiment of the present invention as mounted on a mobile telephone of which only a portion is shown
- Figs, lb and lc display schematically same mounted antenna device in a lateral view and from above, respectively, the former also comprising portion of the head of a user of said telephone
- Figs. Id, le and If show an electrically conductive or semi-conductive means and two alternative radiation elements, respectively, of said antenna device .
- Fig. 2a displays schematically a front view of an antenna device according to a second embodiment of the present invention as mounted on a mobile telephone of which only a portion is shown
- Figs, lb and lc display schematically same mounted antenna device in a lateral view and from above, respectively, the former also comprising portion of the head of a user of said telephone
- Figs. Id and le show an electrically conductive or semi-conductive means and two radiation elements, respectively, of said antenna device.
- a radiating first element here in the form of a meander conductor radiating element 1
- a dielectric cylindrical hollow frame 2 such that radiating element and the frame have a common central longitudinal axis as indicated by dash-dotted line 3.
- Frame 2 is mounted extending outwards on a chassis 4 of a hand portable mobile telephone 5.
- the position of the meander element 1 on the chassis 4 is selected such that radiation of the meander conductor 1, at least within a first frequency band, is transmitted and received effectively in different positions chosen by an operator during standby or during a telephone call.
- the frame 2 is located at one side of a top portion of the chassis 4 projecting upwards.
- the meander element 1 has first and second ends being a first feed point 6 and an open end 7, respectively.
- Feed point 6 is connected to feeding/receiving circuitry (not shown) of mobile telephone 5 through an electrical connector 15 mounted inside of frame 2 as indicated in Fig. lc.
- electrical connector 15 mounted inside of frame 2 as indicated in Fig. lc.
- an elongated electrically conductive or semi-conductive means is supported by said frame 2.
- Pin 8 extends substantially parallel with said longitudinal axis 3 and has first and second ends being a ground point 9 arranged to be connected to ground of mobile telephone 5, and an open end 10, respectively. This is preferably achieved by connecting point 9 to a circuit board (not shown) of mobile telephone 5 or, alternatively, to other connection point considered to be ground.
- Frame 2 has in the illustrated case a circular cross section.
- the present invention covers other designs such as e.g. elliptical, rectangular and quadratic cross sections.
- the frame may further be designed in a curved configuration in such manner that the central longitudinal axis through the frame is curved.
- Electrically conductive or semi-conductive pin 8 extends substantially along the entire length of meander conductor element 1 in the direction of longitudinal axis 3 and is supported by frame 2 substantially at the radially outermost portion of frame 2, i.e. at the outer surface thereof, which is best seen in Fig. lc.
- frame 2 substantially at the radially outermost portion of frame 2, i.e. at the outer surface thereof, which is best seen in Fig. lc.
- pin 8 is further supported by frame 2 radially outwards in the direction of a user's head 12 (see Fig. lb) during use of mobile telephone 5. That is, pin 8 is positioned at the front side 13 of frame 2.
- a second electrically conductive or semi-conductive pin may extend along longitudinal axis 3 and being connected to ground or being left in open circuit.
- Fig. Id shows pin 8 removed from frame 2, which preferably is an electrically conductive or semi-conductive pin made of, e.g. copper, stainless steel or a polymer. Typical dimensions of pin 8 are a length of 20-80 mm, and a cross section of 0.1- 1 x 0.1-1 mm 2 . However, for each mobile telephone design, and particularly for each frame design and radiating element design, pin 8 may be designed and sized in order to achieve optimal performance, e.g. as regards gain and near field radiation. Electrically conductive or semi-conductive pin 8 may be replaced with an electrically conductive or semi- conductive wire, band, pattern, or the like.
- conductive pin 8 is designed to carry a current comparable to that in the meander and thus giving near fields of comparable amplitude but with a phase which is at least partly opposite. By a suitable choice of parameters it is possible to reduce the near field considerable.
- the pin 8 has poor radiating performance which gives an influence on the far field (radiating) which is small compared to the influence on the near field.
- Fig. le shows a possible shape of the meander radiating element 1 being an etched or printed conductor pattern on a dielectric flexible film 14 in a flat configuration.
- the radiating element extends from the feed point 6 at one edge of film 14, which has an essentially rectangular shape, in an alternating curve including parallel sections and turns to the free end 7 at an opposite edge of film 14.
- the single meander radiating element is to be formed from the flat configuration into a configuration wherein film 14 is tubular or, at least 01/22527
- meander element 1 forms part of a cylinder as indicated in Figs. la-c. This is achieved by arching meander element 1 about frame 2, so that the angle relative the longitudinal axis 3 increases and decreases alternately. Such a configuration is compact, provides high durability and can be used in a wide variety of antenna applications.
- meander element may be arched and mounted on the interior surface of hollow frame 2 (not shown) .
- the meander radiating element may be mounted on other carrier or directly on frame 2.
- Meander radiating element 1 may have other geometries such as a meander pattern diagonally on film 14 or rotated 90° in the plane of film 14 as compared to the illustrated case.
- meander is used to describe the radiating element because it is generally a preferred shape. As anyone skilled in the art will recognize an infinite number of other shapes will yield equivalent result by creating an elongation of the conductor making it typically a quarter of a wavelength, such as jointed line pattern, e.g., the pattern 18 as shown in Fig. If, having a feed point 19 and a free end 20, respectively. Particularly, an antenna pattern for operation in a high frequency band has only 1-2 bends.
- pin 8 (or other electrically conductive or semi-conductive means) may be integrally disposed on film 14 (not shown in the Figs.), whereby also pin 8 may be formed through etching or printing.
- radiating element 1 extends tangentially in angular ranges measuring less than 360° around longitudinal axis 3, i.e. extending less than a full turn as is best seen in Fig. lc.
- Electrically conductive or semi-conductive pin 8 O 01/22527 L Z
- radiating element 1 extends preferably in angular ranges where radiating element 1 is absent.
- said frame may further support an impedance matching circuitry (not shown) connecting feed point 6 of radiating element 1 to circuitry of mobile telephone 5.
- FIG. 2a-e a second embodiment of the present invention will be described, which embodiment is identical with said first embodiment except of the designs and positions of the electrically conductive or semi-conductive pin 8' and the meander radiating element 1', 1'', respectively. All other parts in Figs. 2a-e have same reference numerals as in Figs, la-e.
- Pin 8' is in this embodiment supported by frame 2 at a side which is located opposite to the side facing a user' s head 12 (see Fig. 2b) during use of mobile telephone 5. That is, pin 8' is positioned at the back side 16 of frame 2.
- pin 8' has a lateral extension 16 in the vicinity of its first end (9').
- said lateral extension existing in a tangential direction with respect to said central longitudinal axis 3 from the back side 16 to the front side 13 of frame 2, i.e. arched around frame 2, to be connected to ground of the mobile telephone 5.
- pin 8' may extend in a radial direction, i.e. straight through frame 2, which in this case is provided with suitable apertures.
- pin 8' may comprise the various features as depicted in previous embodiment .
- dual meander elements 1', 1'' on a common film 14' are shown, which are tunable to two different frequencies allowing operation of the antenna device in two separated frequency bands. These elements are fed at feed points 6', 6'', which in the illustrated case coincide. Said feed points are to be coupled to circuitry of mobile telephone 5, possibly via an impedance matching means (not shown) .
- the flexible film 14' of the dual meander elements 1', 1'' is preferably intended to be formed in a cylindrical configuration as described with reference to previous embodiment of the invention.
- Alternative designs of radiating elements may be employed such as those depicted in previous embodiment.
- a third embodiment of the present invention (not shown in the Figs.) comprises an electrically conductive or semi-conductive pin as in previous embodiments, but supported by said frame radially outwards and towards a direction which forms a predetermined angle together with the direction towards an intended location of a user' s head during use of the radio communications device with the frame mounted.
- the predetermined angle may range from 0 to 360°, but ranges more preferably from 2 to 10°, and most preferably from 5 to 10°.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Telephone Set Structure (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU78189/00A AU7818900A (en) | 1999-09-24 | 2000-09-20 | Antenna device for a radio communications device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9903459A SE515228C2 (en) | 1999-09-24 | 1999-09-24 | Antenna device with improved near-field radiation characteristics |
SE9903459-7 | 1999-09-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001022527A1 true WO2001022527A1 (en) | 2001-03-29 |
Family
ID=20417139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/001826 WO2001022527A1 (en) | 1999-09-24 | 2000-09-20 | Antenna device for a radio communications device |
Country Status (5)
Country | Link |
---|---|
KR (1) | KR100703937B1 (en) |
CN (1) | CN1184719C (en) |
AU (1) | AU7818900A (en) |
SE (1) | SE515228C2 (en) |
WO (1) | WO2001022527A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1363356A2 (en) * | 2002-05-15 | 2003-11-19 | Kosan I & T Co., Ltd. | External mounting type microchip dual band antenna assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5335366A (en) * | 1993-02-01 | 1994-08-02 | Daniels John J | Radiation shielding apparatus for a radio transmitting device |
WO1994028595A1 (en) * | 1993-05-27 | 1994-12-08 | Griffith University | Antennas for use in portable communications devices |
DE19600041A1 (en) * | 1996-01-02 | 1996-06-20 | Kurt Dipl Ing Bluemel | High-frequency protection device for mobile telephone |
DE19518125A1 (en) * | 1995-05-17 | 1996-11-21 | Immo Dr Wegner | Handheld radio communication apparatus with electromagnetic shielding |
US5666125A (en) * | 1993-03-17 | 1997-09-09 | Luxon; Norval N. | Radiation shielding and range extending antenna assembly |
EP0801471A1 (en) * | 1996-04-09 | 1997-10-15 | Alcatel Mobile Phones | Portable radio telephone with eccentric antenna |
US5826201A (en) * | 1992-11-25 | 1998-10-20 | Asterion, Inc. | Antenna microwave shield for cellular telephone |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0860897B1 (en) * | 1996-09-11 | 2012-07-25 | Panasonic Corporation | Antenna system |
-
1999
- 1999-09-24 SE SE9903459A patent/SE515228C2/en not_active IP Right Cessation
-
2000
- 2000-09-20 KR KR1020027003727A patent/KR100703937B1/en not_active IP Right Cessation
- 2000-09-20 CN CNB008133352A patent/CN1184719C/en not_active Expired - Fee Related
- 2000-09-20 AU AU78189/00A patent/AU7818900A/en not_active Abandoned
- 2000-09-20 WO PCT/SE2000/001826 patent/WO2001022527A1/en active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5826201A (en) * | 1992-11-25 | 1998-10-20 | Asterion, Inc. | Antenna microwave shield for cellular telephone |
US5335366A (en) * | 1993-02-01 | 1994-08-02 | Daniels John J | Radiation shielding apparatus for a radio transmitting device |
US5666125A (en) * | 1993-03-17 | 1997-09-09 | Luxon; Norval N. | Radiation shielding and range extending antenna assembly |
WO1994028595A1 (en) * | 1993-05-27 | 1994-12-08 | Griffith University | Antennas for use in portable communications devices |
DE19518125A1 (en) * | 1995-05-17 | 1996-11-21 | Immo Dr Wegner | Handheld radio communication apparatus with electromagnetic shielding |
DE19600041A1 (en) * | 1996-01-02 | 1996-06-20 | Kurt Dipl Ing Bluemel | High-frequency protection device for mobile telephone |
EP0801471A1 (en) * | 1996-04-09 | 1997-10-15 | Alcatel Mobile Phones | Portable radio telephone with eccentric antenna |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1363356A2 (en) * | 2002-05-15 | 2003-11-19 | Kosan I & T Co., Ltd. | External mounting type microchip dual band antenna assembly |
EP1363356A3 (en) * | 2002-05-15 | 2004-07-21 | Kosan I & T Co., Ltd. | External mounting type microchip dual band antenna assembly |
Also Published As
Publication number | Publication date |
---|---|
AU7818900A (en) | 2001-04-24 |
CN1376322A (en) | 2002-10-23 |
SE9903459L (en) | 2001-03-25 |
KR20020032615A (en) | 2002-05-03 |
SE9903459D0 (en) | 1999-09-24 |
KR100703937B1 (en) | 2007-04-04 |
CN1184719C (en) | 2005-01-12 |
SE515228C2 (en) | 2001-07-02 |
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