WO2004105179A1 - An antenna device and a supply device thereto - Google Patents
An antenna device and a supply device thereto Download PDFInfo
- Publication number
- WO2004105179A1 WO2004105179A1 PCT/SE2003/000839 SE0300839W WO2004105179A1 WO 2004105179 A1 WO2004105179 A1 WO 2004105179A1 SE 0300839 W SE0300839 W SE 0300839W WO 2004105179 A1 WO2004105179 A1 WO 2004105179A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductor
- antenna device
- supply device
- slot
- radiator
- 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
- 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
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/103—Resonant slot antennas with variable reactance for tuning the antenna
Definitions
- the present invention relates to an antenna device according to the preamble to appended Claim 1.
- the present invention also relates to a supply device according to the preamble to appended Claim 14.
- connection impedance to a transceiver in a radiocommunications apparatus in daily parlance a so-called cell or mobile telephone, often lies in the range of 50 ohms, and, depending on the design and type of radiator, its impedance may vary greatly, for example in the range of 20-500 ohms. Thus, an adaptation of the impedance is necessary.
- SE-C2-504 342 discloses an adapter network and an antenna where the adapter network operates with low losses.
- the network consists of a thin, insulated wire which is wound about an earthed rod of a certain diameter.
- the present invention has for its object to design the antenna device intimated by way of introduction such that it obviates the drawbacks in the prior art technology.
- the present invention has for its object to design the antenna device so that this, on the one hand, can operate within a very broad frequency range, from approx. 1.7 GHz to approx. 2.6 GHz and that, on the other hand, it in addition affords the possibility for operation in a lower frequency band, such as the GSM- and GPS-bands, which moreover may be moved without affecting operation within the upper, broad frequency range.
- the present invention further has for its object to realise an antenna device which may be manufactured economically and rationally and which places very slight demands on available space.
- the present invention yet further has for its object to design the supply device intimated by way of introduction so that this obviates the drawbacks in prior art technology, that it functions well on the one hand within a broad, upper frequency range and, on the other hand within a movable lower frequency band together with a plurality of optionally designed radiators regardless of their detailed construction, and finally that it is simple and economical in manufacture.
- the object forming the basis of the present invention will be attained if the antenna device intimated by way of introduction is characterised in that the connection to earth of the first end of the second conductor is disposed via a tuner.
- the object forming the basis of the present invention will be attained in respect of the supply device if this is characterised in that the end of the first conductor sections or the second conductor sections which are located most proximal the connection end are connected to earth via a tuner.
- Fig. 1 shows a circuit card included in a so-called cell or mobile telephone, in which is incorporated the antenna device according to the present invention
- Fig. 2 is a diagram showing the measurement results from measuring a prototype of the device according to the present invention, an operating range being clearly apparent at approximately 900 MHz and a broad band operating range around the central frequency of approximately 2.2 GHz;
- Fig. 3 shows a part of a circuit card with a slot antenna designed according to the present invention
- Fig. 4 shows a first embodiment of a tuner according to the present invention
- Fig. 5 shows a variation of the tuner according to Fig. 4.
- Fig. 6 shows a second embodiment of the tuner
- Fig. 7 shows a third embodiment of the tuner
- Fig. 8 shows a fourth embodiment of the tuner
- Fig. 9 shows a fifth embodiment of the tuner
- Fig. 10 shows a sixth embodiment of the tuner
- Fig. 11 shows a practical embodiment of a supply device which is also shown in Fig.
- Fig. 12 is an exploded view of the supply device according to Fig. 11.
- reference numeral 1 relates to a circuit card which, for example, may be disposed in a cell or mobile telephone.
- the circuit card 1 consists of at least one carrier 2 of dielectric material, as well as at least one metal coating 3, at least on the upper side.
- the circuit card may, however, consist of a plurality of conductive layers corresponding to the metal coating 3 and a number of interposed layers, sheets or strata of a dielectric material disposed therebetween.
- a radiator which may be of optional type. In the illustrated embodiment, it is shown by way of example as a quarter wave slot radiator.
- the radiator or the slot 4 is realised in that the metal coating 3 is removed from both sides of the carrier 2 so that the slot will be transparent in respect of radiation.
- the slot 4 has an aperture 5, which entails that, as was mentioned above, it is tuned for resonance at a quarter wave length.
- the radiator may also be a half wave radiator which, in the example with a slot radiator, entails that the slot is longer and will lack any counterpart to the aperture 5; hence the slot will be closed as a half wave radiator.
- Other types of radiators may also come into consideration.
- the supply device 6 may be a separate unit which thus may be mounted a distance from the radiator 4 but which may also be wholly or partly integrated in the circuit card 1. There is no galvanic connection between the supply device 6 and the radiator 4.
- more than one radiator is needed, this is possible according to the present invention, in that more than one radiator is placed in the same earth plane, i.e. in the same metal coating 3. Even if two slots, in the example using slot radiators, are placed physically close to one another, they will not affect one another electrically. Thus, by the employment of more than one slot, it is possible according to the present invention to realise a multi-band antenna where each band has large band width. By the orientation of the slots in different ways, for example by disposing their longitudinal directions at right angles to one another, it is also possible to affect the radiation pattern so that the radiation lobes from the two radiators differ.
- one slot is disposed with its longitudinal direction approximately horizontal, its radiation lobe will be vertically directed, which is a major advantage in a GPS apparatus.
- the radiation lobe will be substantially horizontal with a slot having a vertical longitudinal direction.
- the metal coating 3 may also be disposed on a casing for the mobile telephone, both an inner, supporting casing and an outer, decorative shell. In the example above with the slot radiator, it then applies that this is also placed on the casing.
- both the radiator and the supply device 6 or exciter each have a longitudinal direction and these longitudinal ⁇ directions are mutually parallel.
- these longitudinal directions are mutually parallel.
- Fig. 3 shows, in simplified schematic form, an antenna device according to the present invention. This antenna device is wholly identical in functional respects with that shown in Fig. 1, apart from the orientation.
- Fig. 3 shows an earth plane 3 which may consist of a metal layer, a metal foil or the like on a suitable carrier of insulating, non-magnetic material such as a circuit card or a metallised region of a casing for the mobile telephone.
- a suitable carrier of insulating, non-magnetic material such as a circuit card or a metallised region of a casing for the mobile telephone.
- the slot will therefore be tuned to resonance at a quarter wave length, where the length of the slot determines the relevant wavelength.
- the present invention also encompasses the possibility of a half wave resonator, in which event in such an embodiment the slot 7 will be longer and closed at both ends.
- the slot 7 is supplied by an exciter or supply device 6 which includes a first or central conductor 9 with a first end 10 and a second end 11.
- the first conductor 9 may consist of a portion of the central conductor in a coaxial cable 12 whose opposite end (not shown in the Figure) is connected to the circuits in the mobile telephone in which the antenna device is included.
- the supply device 6 further includes a second conductor 13 which has a first end 14 and a second end 15.
- the first end 14 of the second conductor 13 is connected to the screen or earth conductor 16 in the coaxial cable 12 while the second end 15 terminates blind.
- the second conductor 13 may also be connected to the earth plane 3 and be earthed in it with its first end 14.
- the first end 14 of the second conductor 13 may also be connected to earth via some other conductor than the screen 16 of the coaxial cable 12.
- the second conductor 13 is in the physical form of a helix, for which reason it has regions that alternatingly are located on different sides of the first conductor 9 along at least a part of its longitudinal extent.
- the helix, or the second conductor 13 will therefore three-dimensionally surround, enclose or extend about the first conductor 9. This also applies in the modified embodiments which will be described below.
- the helix may be shorter than, as long as (Fig. 3), or longer than the second conductor.
- the first conductor 9 lies in the longitudinal direction of the slot 7 and in or parallel with the earth plane 3. There is no galvanic contact between the first and the second conductors 9 and 13 respectively, nor between the second conductor 13 and the metal in the earth plane 3 apart from the earthing of the first end 14 of the second conductor. The distance between the first conductor 9 and the earth plane (unless first conductor lies in the earth plane) determines the degree of connection between the first conductor 9 and the slot 7.
- the second conductor 13 forms an inductance which is distributed along the longitudinal extent of the first conductor 9. Further, the second conductor 13 forms a capacitance between itself and the first conductor 9, this capacitance also being distributed along the length of the first conductor 9. In addition, there are also capacitances between closely adjacent turns in the second conductor.
- the length of the slot 7 determines the centre of the resonance range within which the antenna device operates.
- the length of the central or first conductor 9 is adapted to the length of the slot. However, the length of the first conductor 9 is not particularly critical, but needs only be so large as to provide room for the requisite turns of the second conductor 13.
- the antenna device With the design which is shown in Fig. 3, the antenna device will have a broad band resonance range which is intimated by the arrow A in Fig. 2.
- the second ends 11 and 15 of the first and second conductors 9 and 13, respectively, are located approximately the same distance from the coaxial cable 12. In this embodiment, there is no resonance peak B in Fig. 2. If, on the other hand, the second conductor 13 is extended (see Figs. 4-11) so that its second end 15 extends past the second end 11 of the first conductor 9, this "extra length" of the second conductor 13 contributes with a second resonance region of the antenna device, this resonance region being intimated at the arrow B in Fig. 2. With an extended second conductor 13, it is thus possible to realise an antenna device which, on the one hand, has a narrow resonance region at GSM frequency and, on the other hand, a broad resonance region in the area of 1.7 to 2.6 GHz.
- Figs. 4 and 5 which show two variations of one and the same fundamental solution regarding the tuner, as far as this is possible, the same reference numerals have been employed as in Fig. 3. It is thus apparent that the first end 14 of the second conductor 13 is no longer directly connected to earth via the screen 16 of the coaxial cable 12 or any other direct conductor to earth. Instead, the first end of the second conductor 13 is connected to earth 42 via the tuner which, in this embodiment, includes an inductance 43.
- the inductance 43 can be short-circuited by means of a switch 44 if desired, in which event the embodiment becomes in principle identical to that illustrated in Fig. 3, apart from the extension of the second conductor 13.
- the switch 44 and the inductance 43 are to be found, but the end of the inductance facing away from the first end 14 of the second conductor 13 is connected, via a conductor 45, to the screen 16 of the coaxial cable 12 and thereby to earth.
- the inductance 43 or, generally the tuner can be earthed at any point whatever in that apparatus which the antenna device is intended to serve.
- the earthing point should be selected in such a manner that the earth conductor is as short as possible.
- the switch 44 may be produced in accordance with any optional technology, for example so-called MEMS technology.
- the first end 14 of the second conductor 13 is connected to one end of an inductance 43 whose opposite end is connected to earth 42.
- the inductance has a number of terminals which can be earthed via a switch 47 so that, as a result, a greater or smaller part of the inductance 43 can be connected in between the first end 14 of the second conductor 13 and earth 42.
- the inductance 43 is, like that described above, connected between the first end 14 of the second conductor 13 and earth 42. Parallel over the inductance 43, there is connected a variable capacitance 48 which may possibly be designed as a so-called variocap.
- the first end 14 of the second conductor 13 is, like that described above, connected to one end qf an inductance 43 whose other end is connected to earth 42.
- the inductance 43 has a number of terminals 49 which may lie more or less closely together along the inductance 43 and all of which are connected to capacitances 50.
- the capacitances 50 are connectable earth 42 via a switch 51.
- the first end 14 of the second conductor 13 is earthed via the capacitance 50 illustrated uppermost in the Figure. However, in other positions of the switch 51, a part of the inductance 43 is coupled in between the first end 14, one of the capacitances 50 and earth.
- the first end 14 of the second conductor 13 is, as described above, connected to the one end of the inductance 43 whose other end is connected to earth.
- the upper end. of the inductance is connected, via a branch conductor 52, to a number of capacitances 53 which are of different sizes.
- the opposite ends of the capacitances are connected to a switch 54 by means of which any optional capacitance 53 can be connected to earth.
- Fig. 9 may be described as being a stepwise adjustable variation of the embodiment which is shown in Fig. 7.
- the switch 54 may be designed so that it connects in parallel a plurality of the capacitances 53 and connects them to earth.
- FIG. 10 shows an inductance 43 connected between earth 42 and the first end 14 of the second conductor 13.
- a smaller inductance 55 is disposed with its one end connected to earth and its other end via a switch 5 ⁇ connectable to the first end 14 of the second conductor 13.
- tuner may be designed with discrete components and be placed at a suitable site in the apparatus which the antenna is intended to serve. However, they can also be integrated in the exciter " or supply device 6 as will be described in greater detail below.
- Figs. 11 and 12 show a supply device of the type employed for supplying or exciting the slot 4 in Fig. 1 or a radiator of other design.
- the supply device 6 is formed as a separate unit, but may also, as intimated above, be wholly or partly integrated in the circuit card 1 in Fig. 1.
- the supply device includes a first 25 and a second 24 disk- shaped piece of dielectric material.
- On the upper side of the second piece 24 of dielectric material there is a number of conductor sections 26 which are substantially straight, parallel with one another and disposed in slight spaced apart relationship.
- the conductor sections 26 intersect at an angle a central, longitudinal line through the supply device 6.
- connection 28 with a through-going aperture 29 and finally the conductor section 26 located most proximal the connection 28 has a connection 40.
- first or central conductor 30 which corresponds to the first conductor 9 in Fig. 3 and which, in its one or first end 10, has a connection 31 corresponding to the connection 28 on the second piece of dielectric material, as well as a through-going aperture 36.
- the lower side of the first piece of dielectric material 25 there is a number of conductor sections 33 which, in their opposing ends, have through-going apertures 34.
- the conductor sections 33 make an angle of 180- ⁇ with a central, longitudinal line through the supply device 6. Hereby, the conductor sections 33 will intersect or cross the conductor sections 26.
- connection 41 On the unification of the two pieces 24 and 25, and on soldering or plating through the apertures 27, 34, 29 and 36, a supply device will be obtained with a central or first conductor 30 which is surrounded by or enclosed in a "flattened helix" consisting of the conductor sections 26 and 33 as well as the through platings through the above-mentioned apertures.
- the first conductor 30 should be as tightly surrounded or enclosed in this "flattened helix" as possible, for which reason the length of the conductor sections 26 and 33 is less than that shown in the Figures.
- the supply device according to Fig. 11 may, as an alternative to the described embodiment, be composed of three different pieces of dielectric material, where each piece has an electrically conductive layer from which the conductor sections 26, 30 and 33 are produced.
- Fig. 11 which shows the complete supply device 6, the reference numerals from Fig. 3 have been inserted whereby the analogy between the two constructions is clearly apparent.
- connection points for connection of the supply device 6 to the circuit card 1.
- connection 37 for connecting to the first end 10 of the first conductor 9 (reference numerals 28 and 31 in Fig. 12)
- connection 38 for connection to the first end 14 of the second conductor 13 (the connection 40 in Fig. 12)
- connection 39 for connection to the second end 15 of the second conductor 13 (the connection 41 in Fig. 12).
- the earth plane 3 and the supply device 6 were placed substantially in a common plane.
- certain conductor sections for example the conductor sections 26, 30 and 33 in Fig. 12, in the supply device 6 may be disposed in the circuit card 1.
- the whole supply device 6 may be integrated in the circuit card, while the radiator is disposed as a metallised pattern on the casing of the mobile telephone.
- the metal layer 3 in the form of a metallisation and in the alternative with the radiator in the form of a metallic pattern it is advantageous for reasons of production engineering if the metallisation is not blanket covering but is in the form of a lattice, grid or net where the "mesh size" is slight in relation to the pertinent wavelength.
- the first conductor 9 has been shown as a straight conductor. However, this configuration is not necessary, but the first conductor can just as well be a meandering conductor, a zigzag conductor, an undulating conductor, or a conductor of other configuration as long as it has portions of the second conductor which alternatingly are located on different sides of, or surround the first conductor.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03736385A EP1629565A1 (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
PCT/SE2003/000839 WO2004105179A1 (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
AU2003242052A AU2003242052A1 (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
CN03826802.7A CN1813374B (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2003/000839 WO2004105179A1 (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004105179A1 true WO2004105179A1 (en) | 2004-12-02 |
Family
ID=33476140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2003/000839 WO2004105179A1 (en) | 2003-05-23 | 2003-05-23 | An antenna device and a supply device thereto |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1629565A1 (en) |
CN (1) | CN1813374B (en) |
AU (1) | AU2003242052A1 (en) |
WO (1) | WO2004105179A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0384777A2 (en) * | 1989-02-24 | 1990-08-29 | Gec-Marconi Limited | Antenna element |
EP0762537A2 (en) * | 1995-09-05 | 1997-03-12 | Murata Manufacturing Co., Ltd. | Chip antenna |
US6031503A (en) * | 1997-02-20 | 2000-02-29 | Raytheon Company | Polarization diverse antenna for portable communication devices |
US6198441B1 (en) * | 1998-07-21 | 2001-03-06 | Hitachi, Ltd. | Wireless handset |
-
2003
- 2003-05-23 CN CN03826802.7A patent/CN1813374B/en not_active Expired - Fee Related
- 2003-05-23 EP EP03736385A patent/EP1629565A1/en not_active Withdrawn
- 2003-05-23 AU AU2003242052A patent/AU2003242052A1/en not_active Abandoned
- 2003-05-23 WO PCT/SE2003/000839 patent/WO2004105179A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0384777A2 (en) * | 1989-02-24 | 1990-08-29 | Gec-Marconi Limited | Antenna element |
EP0762537A2 (en) * | 1995-09-05 | 1997-03-12 | Murata Manufacturing Co., Ltd. | Chip antenna |
US6031503A (en) * | 1997-02-20 | 2000-02-29 | Raytheon Company | Polarization diverse antenna for portable communication devices |
US6198441B1 (en) * | 1998-07-21 | 2001-03-06 | Hitachi, Ltd. | Wireless handset |
Also Published As
Publication number | Publication date |
---|---|
EP1629565A1 (en) | 2006-03-01 |
CN1813374B (en) | 2010-12-08 |
AU2003242052A1 (en) | 2004-12-13 |
CN1813374A (en) | 2006-08-02 |
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