WO2001065636A1 - A wideband multiband internal antenna device and a portable radio communication device comprising such an antenna device - Google Patents

A wideband multiband internal antenna device and a portable radio communication device comprising such an antenna device Download PDF

Info

Publication number
WO2001065636A1
WO2001065636A1 PCT/SE2001/000369 SE0100369W WO0165636A1 WO 2001065636 A1 WO2001065636 A1 WO 2001065636A1 SE 0100369 W SE0100369 W SE 0100369W WO 0165636 A1 WO0165636 A1 WO 0165636A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna device
frequency band
conductive element
essentially
radiating conductive
Prior art date
Application number
PCT/SE2001/000369
Other languages
French (fr)
Inventor
Annika Yidong Hu
Original Assignee
Allgon Mobile Communications Ab
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
Application filed by Allgon Mobile Communications Ab filed Critical Allgon Mobile Communications Ab
Priority to AU2001236283A priority Critical patent/AU2001236283A1/en
Publication of WO2001065636A1 publication Critical patent/WO2001065636A1/en

Links

Classifications

    • 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
    • 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
    • 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
    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

Definitions

  • the present invention relates generally to an internal planar antenna device in radio communication and more particularly to a wideband multiband internal planar antenna for a radio communication device such as a mobile telephone adapted for use with at least two frequency bands.
  • AMPS Advanced Mobile Phone Service
  • GSM 900 Global System for Mobile communications
  • DCS 1800 Digital Cellular System
  • PCS 1900 Personal Communications Services
  • Protruding antennae are frequently used in mobile tele- pnones, however it is difficult to achieve a compact tele ⁇ phone with a protruding antenna. Such an antenna can also be experienced as annoying if it gets entangled in a pocket for example. Therefore it is desirable with integral antennae, n connection with mobile telephones.
  • EP 0892459 it is described how to tune a planar antenna with two resonance frequencies to desirable frequencies. This is achieved by switching between different tuning elements. Thereby it is possible to provide access to four different radio communication systems.
  • a drawback with this solution is that it is necessary to switch cetween different tuning elements to tune the an- tenna to tne desired frequency, where the switching requires complex technical solutions and the switching takes time .
  • Througn US 5926139 it is disclosed how to use a planar antenna m two frequency bands. Two radiating portions are connected to a common feeding portion. Together the three portions have an overall configuration shaped generally like tne letter J. The antenna operates in the frequency bands 824-896 and 1850-1990 MHz.
  • a further frequency band is the 2.4 GHz band, whicn is utilized in Bluetooth applications.
  • An ob ect of the present invention is to provide an antenna device that operates in at least two frequency bands, where the lowest frequency band is sufficiently w de witnout neec of different tuning elements.
  • Another ooject of the present invention is to provide an antenna device of the km ⁇ initially mentioned that is com- pact and internal m a mobile telephone.
  • a further object of the present invention is to provide a compact antenna, which is easy and cost effective to produce .
  • the invention is based on the realisation that it is possible to provide an internal antenna that operates in a wide lower frequency band and m a higher frequency ban ⁇ .
  • an antenna device as defined n claim 1.
  • Fig. 1 shows an antenna device according to the invention
  • Fig. 2 shows an embodiment with an additional antenna for short-range communication
  • Fig. 3 snows an exploded view of a portable radio communication device wit an antenna device according to the in ⁇ vention .
  • the antenna device comprises a single planar radiating element 3, having a first and a second portion, which are sr.aped like two orthogonal generally rectangular elements w tn a portion in comm.cn. Th s gives the antenna a general shape of the capital letter L.
  • the first portion generally enclosed by a dotted line 8 and extending vertically m the figure, resonates essentially in a first, lower frequency oand
  • the second portion generally enclosed by a dotted line 7 and extending horizontally in the figure, reso- nates essentially n a second, higher frequency band.
  • a slit 5 is provided, where tne slit has a first part that is approximately 45 degrees angular to an edge of the second portion and a second part that is essentially parallel to the edge of the second portion.
  • tne slit has a first part that is approximately 45 degrees angular to an edge of the second portion and a second part that is essentially parallel to the edge of the second portion.
  • a grounding element is connected, at a point 1, to tne ra ⁇ diating element 3 at a corner of the common portion and is connectable to a ground element .
  • the ground element 4 is in a plane different from a plane of the radiating element 3.
  • a feeding element is connected, at a point 2, to the ra- diatmg element 3 at an edge of tne first radiating por ⁇ tion, at a distance d of approximately 15 mm from the grounding element, and is connectable to a transceiver cir ⁇ cuit (not shown) .
  • the grounding element could be connected to an edge of the radiating element 3 instead of to a corner.
  • the feeding element would m this case still be connected to the radi- ating element 3 at an edge of the first portion, at a distance d of approximately 15 mm from the grounding element.
  • the feeding element could be connected to a notch in the edge of the radiating element 3 in the embodiments de- scribed above.
  • FIG. 2 An antenna device for a mobile telephone is shown, where two (a first and a second) planar antennae are utilized to provide wideband multiband frequency coverage.
  • the first planar antenna has a radiating element 3 with, dual band coverage, where a lower frequency band and a middle frequency band are provided.
  • the second planar antenna has a radiating element 6 with single band coverage, where a higher fre- quency band is provided.
  • the first planar antenna is as described above.
  • the second planar antenna has a resonance frequency with sufficient bandwidth so that it is possible to utilize in Bluetooth applications.
  • the second planer antenna utilizes the same ground element as the first planar antenna. It can utilize the same transceiver unit as the first planar antenna or a separate transceiver unit whichever is preferred. It is due to the unique shape of the first planar antenna that it is possible to provide the second planar antenna for Bluetooth applications and still get a compact antenna.
  • the first frequency band mentioned above is about 824-960 MHz (AMPS and GSM 900)
  • said second frequency band is about 1710-1880 MHz (DCS 1800) or 1880-1990 MHz (PCS 1900)
  • said third frequency band is about 2400-2500 MHz (Blue- tooth) .
  • a portable radio communication device will be described with reference to Fig. 3.
  • the portable radio communication device has a housing that encapsulates an antenna 9, wherein the antenna can be any of previously mentioned an- tenna devices.
  • Radiating elements described herein is to be interpreted as elements that can both receive and/or transmit radio frequency radiation.

Abstract

The invention relates to a problem with how to achieve a wideband multiband internal antenna device. This is ob-tained by providing an antenna device that radiates in at least two frequency bands, comprising a first and a second frequency band, comprising: an essentially planar radiating conductive element (3) comprising a first and a second portion, wherein said first portion radiates essentially in the first frequency band and the second portion radiates essentially in the second frequency band, wherein said first and second portions are generally rectangular, essentially orthogonal to each other and have a common portion, whereby a wide first frequency band is provided.

Description

A WIDEBAND MULTIBAND INTERNAL ANTENNA DEVICE AND A PORTABLE RADIO COMMUNICATION DEVICE COMPRISING SUCH AN ANTENNA
DEVICE
FIELD OF INVENTION
The present invention relates generally to an internal planar antenna device in radio communication and more particularly to a wideband multiband internal planar antenna for a radio communication device such as a mobile telephone adapted for use with at least two frequency bands.
BACKGROUND
In recent years, mobile telephones have become increasingly popular. At present time, mobile systems in different places in the world utilize different frequency bands for radio communication. Some widely used systems are AMPS (Advanced Mobile Phone Service) , GSM 900 (Global System for Mobile communications), DCS 1800 (Digital Cellular System) and PCS 1900 (Personal Communications Services) . Several solutions exist where comomations of frequency bands are used in one telephone.
It is often desirable to provide a telephone that: operates in a plurality of systems. It is also desirable to provide an antenna that is as small as possible in order to make it possible to provide a very compact: telephone.
Protruding antennae are frequently used in mobile tele- pnones, however it is difficult to achieve a compact tele¬ phone with a protruding antenna. Such an antenna can also be experienced as annoying if it gets entangled in a pocket for example. Therefore it is desirable with integral antennae, n connection with mobile telephones.
In EP 0892459 it is described how to tune a planar antenna with two resonance frequencies to desirable frequencies. This is achieved by switching between different tuning elements. Thereby it is possible to provide access to four different radio communication systems.
A drawback with this solution is that it is necessary to switch cetween different tuning elements to tune the an- tenna to tne desired frequency, where the switching requires complex technical solutions and the switching takes time .
Througn US 5926139 it is disclosed how to use a planar antenna m two frequency bands. Two radiating portions are connected to a common feeding portion. Together the three portions have an overall configuration shaped generally like tne letter J. The antenna operates in the frequency bands 824-896 and 1850-1990 MHz.
A drawDack with this solution is that the lower frequency band is narrow.
It is generally known that it is difficult to provide a planar antenna for dual band where tne lower of the two bands covers both GSM 900 and AMPS operating frequencies.
A further frequency band is the 2.4 GHz band, whicn is utilized in Bluetooth applications.
OBJECTS OF THE INVENTION
An ob ect of the present invention is to provide an antenna device that operates in at least two frequency bands, where the lowest frequency band is sufficiently w de witnout neec of different tuning elements.
Another ooject of the present invention is to provide an antenna device of the kmα initially mentioned that is com- pact and internal m a mobile telephone.
A further object of the present invention is to provide a compact antenna, which is easy and cost effective to produce .
SUMMARY OF THE INVENTION
The invention is based on the realisation that it is possible to provide an internal antenna that operates in a wide lower frequency band and m a higher frequency banα.
The above mentioned objects among others are, according to the invention, attained by an antenna device and by a port- able radio communication device as claimed in the appended claims .
According to the present invention tnere is provided an antenna device as defined n claim 1.
There is also provided an antenna device according to the present invention as defined in claim 14.
There is further provided a portable radio communication device according to the present invention as defined in claim 18.
Further advantages are achieved by features defined in the dependent claims. BPIEF DESCRIPTION OF DRAWINGS
Tne present invention will become more fully understood from tne detailed description of embodiments of the present invention giver herembelow ana tne accompanying figures, which are given by way of illustration only, and thus are not limitative of the invention, in which:
Fig. 1 shows an antenna device according to the invention,
Fig. 2 shows an embodiment with an additional antenna for short-range communication, and
Fig. 3 snows an exploded view of a portable radio communication device wit an antenna device according to the in¬ vention .
DETAILED DESCRIPTION OF THE INVENTION
In the following description, for purposes of explanation and not limitation, specific details are set fourth, such as particular hardware, applications, techniques, etc. in order to provide a tnorough understanding of the present invention. However, it will be apparent to one skilled in the art that tne present invention may be utilized in other emoodi- ments tnat depart from these specific details. In other in¬ stances, detailed descriptions of well-known metnods, proto¬ cols, apparatuses, and circuits are omitted so as not to ob¬ scure tne description of tne present invention with unneces¬ sary details.
Reference will now be made to Fig. 1, wherein an antenna device for a mobile telephone is shown, where a planar an¬ tenna is utilized to provide wideband multiband frequency coverage . The antenna device comprises a single planar radiating element 3, having a first and a second portion, which are sr.aped like two orthogonal generally rectangular elements w tn a portion in comm.cn. Th s gives the antenna a general shape of the capital letter L. The first portion, generally enclosed by a dotted line 8 and extending vertically m the figure, resonates essentially in a first, lower frequency oand, and the second portion, generally enclosed by a dotted line 7 and extending horizontally in the figure, reso- nates essentially n a second, higher frequency band.
In order to reduce the length of the second portion a slit 5 is provided, where tne slit has a first part that is approximately 45 degrees angular to an edge of the second portion and a second part that is essentially parallel to the edge of the second portion. With the slit 5 provided it is possible to achieve a desired resonance frequency with an overall length tnat is snorter tnan a quarter of a wavelength, which is convenient to achieve the desired resonance frequency when a grounding element is utilized.
A grounding element is connected, at a point 1, to tne ra¬ diating element 3 at a corner of the common portion and is connectable to a ground element . The ground element 4 is in a plane different from a plane of the radiating element 3. A feeding element is connected, at a point 2, to the ra- diatmg element 3 at an edge of tne first radiating por¬ tion, at a distance d of approximately 15 mm from the grounding element, and is connectable to a transceiver cir¬ cuit (not shown) .
The grounding element could be connected to an edge of the radiating element 3 instead of to a corner. The feeding element would m this case still be connected to the radi- ating element 3 at an edge of the first portion, at a distance d of approximately 15 mm from the grounding element.
The feeding element could be connected to a notch in the edge of the radiating element 3 in the embodiments de- scribed above.
In order to describe an alternative embodiment according to the present invention reference is made to Fig. 2. An antenna device for a mobile telephone is shown, where two (a first and a second) planar antennae are utilized to provide wideband multiband frequency coverage. The first planar antenna has a radiating element 3 with, dual band coverage, where a lower frequency band and a middle frequency band are provided. The second planar antenna has a radiating element 6 with single band coverage, where a higher fre- quency band is provided.
The first planar antenna is as described above. The second planar antenna has a resonance frequency with sufficient bandwidth so that it is possible to utilize in Bluetooth applications. The second planer antenna utilizes the same ground element as the first planar antenna. It can utilize the same transceiver unit as the first planar antenna or a separate transceiver unit whichever is preferred. It is due to the unique shape of the first planar antenna that it is possible to provide the second planar antenna for Bluetooth applications and still get a compact antenna.
The first frequency band mentioned above is about 824-960 MHz (AMPS and GSM 900) , said second frequency band is about 1710-1880 MHz (DCS 1800) or 1880-1990 MHz (PCS 1900), and said third frequency band is about 2400-2500 MHz (Blue- tooth) . A portable radio communication device will be described with reference to Fig. 3. The portable radio communication device has a housing that encapsulates an antenna 9, wherein the antenna can be any of previously mentioned an- tenna devices.
Radiating elements described herein is to be interpreted as elements that can both receive and/or transmit radio frequency radiation.
It will be obvious that the invention may be varied in a plurality of ways. Such variations are not to be regarded as a departure from the scope of the invention. Ail such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the appended claims.

Claims

1- An antenna device for transmitting and/or receiving RF radiation m at least two separate frequency bands, cora- prising a first and a second frequency band, comprising:
an essentially planar radiating conductive element (3) comprising a first and a second portion, wherein said first portion radiates essentially in the first frequency band and the second portion radiates essentially in the second frequency band,
a feeding element connected (2) to said radiating conductive element (3) and connectable to a transceiver circuit, and
a grounding element connected (1) to said radiating con- ductive element (3) and connectable to a ground element (4),
characterised i n that
said first and second portions are generally rectangular, essentially orthogonal to each other and have a common portion, whereoy a wide first frequency bard is provided.
2. The antenna device according to claim 1, wherein the second frequency band is higher than the first frequency band.
3. The antenna device according to any of the preced¬ ing claims, wherein the second portion comprises a slit (5) .
4. The antenna device according to any of the preceding claims, wherein the first frequency band is about 824- 960 MHz.
5. The antenna device according to any of the preced- ing claims, wherein the grounding element is connected (1) to the radiating conductive element (3) at a corner of said common portion.
β. The antenna device according to any of the preceding claims, wherein the feeding element is connected (2) to the radiating conductive element (3) at an edge of said second portion.
7. The antenna device according to any of claim 1 to 4 or 6, wherein the grounding element is connected to the radiating conductive element (3) at an edge of said radiating element .
8. The antenna device according to any of the preceding claims, wherein the first and second portions together have the general shape of the capital letter L.
9. The antenna device according to any of claims 3 to 8, wherein the slit (5) is open at one end thereof.
10. The antenna device according to any of claims 3 to 9, wherein the slit (5) is partially parallel to an edge of said second portion.
11. The antenna device according to any of claims 3 to 10, wherein a part of the slit (5) is 45 degrees angular to an edge of said second portion.
12. The antenna device according to any of the preced¬ ing claims, further comprising: a second essentially planar radiating conductive element (6), wnicn radiates in a third frequency band,
a second feeding element connected to said second essentially planar radiating conductive element and connect- aole to a transceiver circuit, and
a second grounding element connected to said second essentially planar radiating conductive element and connectable to said ground element (4).
13. The antenna device according to clam 12, wnerem the second essentially planar radiating conductive element
(6) is at least partly located within a frame, wnicn is limited by a general rectangular shape that circumscribes the first essentially planar radiating conductive element (3) , but wnich does not overlap the first essentially planar ra- diatir.g conductive element (3) .
14. An antenna device for transmitting and/or receiving RF radiation m three separate frequency bands, namely a first, a second, and a third frequency band, comprising:
a first essentially planar radiating conductive element (31 comprising a first and a second portion, wherein said first portion radiates essentially in the first frequency band and the second portion radiates essentially m the second frequency band,
a first feeding element connected (2) to said first radi- atir.g conductive element (3) and connectable to a trans¬ ceiver circuit, a first grounding element connected (I) to said first radiating conductive element (3) and connectable to a ground element (4),
characterised in that
said first and second portions are generally rectangular, essentially ortnogonal to each other and have a common portion, whereoy a wide first frequency band is provided,
and wnerem tne antenna device comprises a second essen- tially planar radiating conductive element (6), which radiates in tne tnird frequency band,
a second feeding element connected to said second essentially planar radiating conductive element (6) and connectable to tne transceiver circuit, and
- a second grounding element connected to said second essentially planar radiating conductive element (6) and connectable to said ground element (4) .
15. The antenna device according to claim 14, wherein the first frequency band is the lowest frequency band.
16. The antenna device according to any of claim 14 or 15, wherein the first frequency band is about 824-960 MHz.
17. The antenna device according to any of claims 14, to 16 wnerem the third frequency band is about 2400-2500 MHz.
18. A portable radio communication device comprising:
- a housing, an antenna in the housing,
characterised in that
the antenna comprises an antenna device according to any of the preceding claims.
PCT/SE2001/000369 2000-03-02 2001-02-20 A wideband multiband internal antenna device and a portable radio communication device comprising such an antenna device WO2001065636A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001236283A AU2001236283A1 (en) 2000-03-02 2001-02-20 A wideband multiband internal antenna device and a portable radio communication device comprising such an antenna device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0000685A SE516293C2 (en) 2000-03-02 2000-03-02 A broadband, multi-band internal antenna device and a portable radio communication device comprising such an antenna device.
SE0000685-8 2000-03-02

Publications (1)

Publication Number Publication Date
WO2001065636A1 true WO2001065636A1 (en) 2001-09-07

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US7605763B2 (en) 2005-09-15 2009-10-20 Dell Products L.P. Combination antenna with multiple feed points
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US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas

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US10056682B2 (en) 1999-09-20 2018-08-21 Fractus, S.A. Multilevel antennae
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US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US10644380B2 (en) 2006-07-18 2020-05-05 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11031677B2 (en) 2006-07-18 2021-06-08 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11349200B2 (en) 2006-07-18 2022-05-31 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11735810B2 (en) 2006-07-18 2023-08-22 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

Also Published As

Publication number Publication date
AU2001236283A1 (en) 2001-09-12
SE0000685D0 (en) 2000-03-02
SE516293C2 (en) 2001-12-17
SE0000685L (en) 2001-09-03

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