EP1922783A1 - Compact multiband antenna - Google Patents
Compact multiband antennaInfo
- Publication number
- EP1922783A1 EP1922783A1 EP06808268A EP06808268A EP1922783A1 EP 1922783 A1 EP1922783 A1 EP 1922783A1 EP 06808268 A EP06808268 A EP 06808268A EP 06808268 A EP06808268 A EP 06808268A EP 1922783 A1 EP1922783 A1 EP 1922783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arm
- antenna
- band
- antenna according
- mhz
- 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.)
- Granted
Links
- 238000001914 filtration Methods 0.000 claims description 8
- 230000006978 adaptation Effects 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- 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
Definitions
- the present invention relates to a compact multiband antenna, more particularly to a compact antenna that can be connected to a digital terrestrial television (DTT) receiver in DVB-H format (for Digital Video Broadcast Handheld in English), the receiver being able to be a portable device such as a PDA (for Personal Digital Assistant).
- DTT digital terrestrial television
- PDA Personal Digital Assistant
- DVB-H format is possible because of the computing power of the microprocessor that equips most of these devices.
- the DVB-H standard uses a new digital compression standard for video called H264 and recommends placing this new image format for mobile applications either in the UHF band (band between 470 and 870 MHz) or in the L band ( band around 1.5 GHz).
- the above portable terminals must also be able to communicate using a cellular network of GSM 900 type (for Global System for Mobile Communications 900 MHz in English).
- GSM 900 type for Global System for Mobile Communications 900 MHz in English
- Antennas that can be used with this type of terminal must therefore be sufficiently compact and meet the constraints mentioned above.
- the invention consists in proposing a compact multiband antenna in the form of an accessory for PDAs or mobile terminals which is broadband from the point of view of the DVB-H reception, multiband to access the L-band and filtering for the part GSM.
- the subject of the present invention is therefore a compact multiband antenna, characterized in that it consists of a dipole-type element comprising a first conducting arm connected to a second arm conductor having the form of a housing mounted on a ground plane, the first and second arms being supplied with a differential and a second slot-like element formed on said ground plane in the extension of said second arm.
- the first and second arms are rotatably mounted relative to each other. Therefore, it is possible to fold the first arm on the second arm so as to obtain a compact object that can be easily stored in a pocket.
- the first conducting arm is planar with a triangular flared portion at the connection with the second arm, the triangular flared portion extending through a rectangular or square portion.
- the specific shape of the second arm provides broadband operation while maintaining a small footprint.
- the antenna is adapted to cover the UHF band.
- the second conducting arm has the shape of a housing whose dimensions are adapted to receive an electronic card.
- this electronic card is compatible with the DVB-H standard and it comprises at least the circuits for receiving the video stream and sending it to the mobile terminal or PDA.
- the dipole-type element is connected to an adaptation circuit.
- This adaptation circuit is optimized so as to maximize the transmission between the processing circuits of the video stream and the antenna. It is also dedicated to the lower part of the UHF band, namely the 470 MHz band at 700 MHz and performs an additional filtering function for the GSM band, namely around 900 MHz.
- the slot-type element comprises two U-shaped slots mounted upside down. These two resonant slots are made in the ground plane in extension the second conducting arm of the dipole element.
- the resonant slots are sized to achieve proper antenna matching in the L-band, between 1452 MHz and 1492 MHz for Europe and between 1670 MHz and 1675 MHz for the United States.
- Fig. 1 is a top view and a B is a perspective view of a compact multiband antenna according to the present invention.
- Fig. 2 shows an embodiment of the matching circuit.
- Fig. 3 is a schematic plan view of an electronic card used with the antenna of the present invention.
- Fig. 4 represents a curve giving the transmission losses between the amplifier provided at the input of the electronic card and the antenna.
- Fig. 5 is a curve giving the gain as a function of the frequency of an antenna according to the present invention.
- Fig. 6 is a curve giving the efficiency as a function of the frequency of the antenna of FIG. 1 with adaptation cells.
- Fig. 7 is a curve giving the adaptation of an antenna according to the antenna of FIG. 1 to 2 GHz loaded on 50 ohms.
- Fig. 8 represents the radiation patterns of the antenna of FIG. 1, at 600 MHz and at 1600 MHz, respectively.
- the antenna consists of a dipole-type element 1 and a slot-like element 2.
- the two functions are not placed next to each other but one in the other.
- the necessary large size of the ground plane is used to be effective in the UHF band, in order to integrate slots which make it possible to adapt the signal in L-band.
- the dipole-type element comprises a first arm 10 of shape planar with a substantially triangular flared portion 10a extending through a rectangular portion 10b. This shape was chosen for a minimal size, the flared portion of triangular shape to obtain the desired broadband operation.
- the portion 10 is particularly compact with a total length of 35 mm and a width of 35 mm.
- This first arm 10 is connected at the end of the triangular flared portion by a connecting element 12 to the second arm 11 of the dipole.
- the second arm 11 has a volume form, more particularly the shape of a rectangular or square case extended by a planar portion in which the slots will be inserted.
- the first and second arms of the element 1 are made of a conductive material, namely metal or with a metallized material.
- the second arm 11 also has a volume portion whose length is 35 mm, the width 35 mm and the thickness 16 mm, plus a planar portion.
- the two arms 10 and 11 are rotatably mounted at the axis 12, so as to fold the arm 10 on the arm 11 for transport.
- the antenna is in use mode when the arm 10 is unfolded, as shown in FIG.
- the arm 11 is fixed on a ground plane 3.
- This ground plane may be, for example, consisting of a conductive material, namely metal or with a metallized material.
- the antenna comprises a slot-type element 2. More specifically, two U-shaped slots 20, 21 mounted upside down, are performed on the metallized plane 3 in the extension of the arm 11. These U-shaped slots are resonant slots and allow to provide a correct adaptation, namely a value for S 11 less than -1OdB at the level of the antenna in the L-band, namely in the 1452 MHz to 1492 MHz band for Europe or the 1670 MHz band at 1675 MHz for the United States.
- the second housing-shaped arm 11 is dimensioned and made to be able to receive an electronic card 4 whose one end, namely the end protruding from the housing 11 in Figure 1 B, can be inserted into a connector of a portable terminal such as a PDA or the like.
- This adaptation circuit connects to the antenna at the connection point 12. It comprises, as represented in FIG. 2, two capacitors C1, C11 connected in series between the point of connection to the antenna A and the input of the LNA and two inductors L1, L11 respectively connected between the point of entry of the capacitor L1 and the ground for the inductor L1 and between the entry point of the capacitor C11 and the ground for the inductor L11.
- This adaptation circuit has been optimized to maximize the transmission between the LNA and the antenna at the bottom of the UHF band, namely between 470 MHz and 700 MHz, and to provide an additional filtering function for the GSM band around 900 MHz.
- the elements of the adaptation circuit have the following values:
- This electronic card 4 has a length of between 70 and 80 mm and a width of 35 mm to adapt to said housing.
- This electronic card therefore comprises an LNA 40 connected to the antenna output, possibly through the adaptation circuit described above.
- This circuit 40 is connected to a tuner 41 operating for the UHF bands and for the band L.
- the output of the tuner 41 is sent to a DVB-H demodulator 42.
- the output of the demodulator is sent to an SDIO interface circuit 43 (FIG. for Secure Digital Input / Output in English). This interface makes it possible to send the video stream to a portable terminal such as a PDA through a 44 SDIO connector.
- An antenna with its matching circuit as described with reference to Figures 1 and 2 has been simulated.
- An ADS2004 circuit simulator was used to optimize the values and choice of the matching circuit to maximize transmission between the antenna and the LNA.
- An IE3D electromagnetic simulator was used to give the gain, efficiency and radiation curves as a function of frequency for the antenna associated with its adaptation circuit optimized on the previous software. The simulation gave the curves of Figures 4 to 7 as well as the radiation patterns of Figure 8.
- the curve of FIG. 4 gives the variations as a function of the frequency of the transmission losses between the antenna and the LNA of the electronic circuit of FIG. 3. It can be seen that these losses are minimized and smoothed over the entire UHF band used with the DVB-H standard (ie between 470 MHz and 700 MHz). However, we see a significant loss around 900 MHz, which shows that the matching circuit performs a filtering function at this frequency.
- Figure 5 shows the gain of the antenna as a function of frequency. This curve confirms a similar operation to a dipole in the UHF band (theoretically a dipole has a directivity of 2.17 dB) but more directional, in the band L.
- the gain curve approaches 5 dBi at 1.6 GHz, which is significant of a radiation pattern more directive.
- the directionality at 1.6 GHz can be explained by the fact of the networking of two radiating slots whose diagrams add up in a preferred direction.
- FIG. 6 represents the efficiency of the antenna system with an adaptation cell as described with reference to FIG. 2.
- an antenna efficiency better than 60% is obtained over the entire UHF band of the DVB standard.
- FIG. 7 represents the adaptation of the antenna up to 2 GHz, ie it gives the values of the parameters S 11 of the antenna and its adaptation circuit beyond 1 GHz when it is loaded on 50 ohms. An adaptation less than -1OdB is thus obtained in the L-band.
- This adaptation is due to the resonance of the slots 20, 21 whose dimensions have been optimized on the location in the ground plane over the length and the width of the slots of FIG. to cover both the European 1452-1492 MHz L band and the US 1670-1675 MHz L band.
- Figure 8 shows the 600 MHz and 1600 MHz radiation patterns of the antenna of Figure 1.
- the 600 MHz form is typical of a dipole (torus) whose null axis corresponds to the longitudinal axis of the antenna.
- the shape at 1.6 GHz is both the combination of the diagrams of the two slots as well as the asymmetry of the structure generated by the placement of the slots on the ground plane near a "canister".
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0552697 | 2005-09-07 | ||
FR0552987A FR2891666A1 (en) | 2005-10-03 | 2005-10-03 | Compact multi-band antenna has two arms that can be rotated relative to one another, one of which is box-shaped and designed to receive electronic card |
PCT/FR2006/050828 WO2007028918A1 (en) | 2005-09-07 | 2006-08-31 | Compact multiband antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1922783A1 true EP1922783A1 (en) | 2008-05-21 |
EP1922783B1 EP1922783B1 (en) | 2010-04-28 |
Family
ID=37686028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06808268A Active EP1922783B1 (en) | 2005-09-07 | 2006-08-31 | Compact multiband antenna |
Country Status (7)
Country | Link |
---|---|
US (1) | US7796090B2 (en) |
EP (1) | EP1922783B1 (en) |
JP (1) | JP2009507443A (en) |
KR (1) | KR20080046168A (en) |
CN (1) | CN101258643B (en) |
DE (1) | DE602006014003D1 (en) |
WO (1) | WO2007028918A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8111204B2 (en) * | 2008-01-31 | 2012-02-07 | Silicon Laboratories Inc. | Slot antenna for a circuit board ground plane |
WO2012154140A1 (en) * | 2011-05-06 | 2012-11-15 | Temel Engin Tuncer | Nonsymmetric wideband dipole antenna |
JP2013021562A (en) * | 2011-07-12 | 2013-01-31 | Furukawa Electric Co Ltd:The | Non-directional antenna, and non-directional antenna array |
KR101879705B1 (en) * | 2012-01-18 | 2018-07-18 | 삼성전자주식회사 | Antenna apparatus for portable terminal |
US9147938B2 (en) | 2012-07-20 | 2015-09-29 | Nokia Technologies Oy | Low frequency differential mobile antenna |
JP5481598B1 (en) * | 2013-05-20 | 2014-04-23 | Necトーキン株式会社 | Communication device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5608413A (en) * | 1995-06-07 | 1997-03-04 | Hughes Aircraft Company | Frequency-selective antenna with different signal polarizations |
US6466176B1 (en) * | 2000-07-11 | 2002-10-15 | In4Tel Ltd. | Internal antennas for mobile communication devices |
ES2309083T3 (en) * | 2000-08-28 | 2008-12-16 | In4Tel Ltd. | APPARATUS AND METHOD FOR THE IMPROVEMENT OF OPERATION IN LOW FREQUENCY OF MOBILE ANTENNAS. |
TWI287317B (en) * | 2001-08-23 | 2007-09-21 | Asustek Comp Inc | Antenna module combining electrodes of differential-type circuit |
JP2005503062A (en) * | 2001-09-13 | 2005-01-27 | フラクトゥス・ソシエダッド・アノニマ | Multilevel space-filling ground plane for small multiband antennas |
US20030112200A1 (en) * | 2001-12-17 | 2003-06-19 | Alcatel, Radio Frequency Systems, Inc. | Horizontally polarized printed circuit antenna array |
-
2006
- 2006-08-31 DE DE602006014003T patent/DE602006014003D1/en active Active
- 2006-08-31 CN CN2006800327981A patent/CN101258643B/en active Active
- 2006-08-31 WO PCT/FR2006/050828 patent/WO2007028918A1/en active Application Filing
- 2006-08-31 US US11/991,521 patent/US7796090B2/en active Active
- 2006-08-31 JP JP2008529666A patent/JP2009507443A/en not_active Withdrawn
- 2006-08-31 EP EP06808268A patent/EP1922783B1/en active Active
- 2006-08-31 KR KR1020087004583A patent/KR20080046168A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2007028918A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1922783B1 (en) | 2010-04-28 |
KR20080046168A (en) | 2008-05-26 |
JP2009507443A (en) | 2009-02-19 |
US20090135075A1 (en) | 2009-05-28 |
CN101258643A (en) | 2008-09-03 |
US7796090B2 (en) | 2010-09-14 |
WO2007028918A1 (en) | 2007-03-15 |
DE602006014003D1 (en) | 2010-06-10 |
CN101258643B (en) | 2011-08-24 |
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