WO2006125925A1 - Antenne monopole - Google Patents
Antenne monopole Download PDFInfo
- Publication number
- WO2006125925A1 WO2006125925A1 PCT/FR2006/001203 FR2006001203W WO2006125925A1 WO 2006125925 A1 WO2006125925 A1 WO 2006125925A1 FR 2006001203 W FR2006001203 W FR 2006001203W WO 2006125925 A1 WO2006125925 A1 WO 2006125925A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- strands
- strand
- frequency
- adaptation
- Prior art date
Links
Classifications
-
- 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
- H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
- H01Q9/46—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions with rigid elements diverging from single point
-
- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
-
- 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
- H01Q9/32—Vertical arrangement of element
-
- 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
- H01Q9/40—Element having extended radiating surface
-
- 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
Definitions
- the present invention relates to a monopole antenna, more particularly a compact antenna with a low production cost and a wide frequency band that can cover the entire UHF band.
- the present invention relates to a monopole antenna adapted to the portable reception of the digital terrestrial television (TNT) and which does not require an adaptation network
- the modulation used is an OFDM multi-carrier modulation in accordance with the DVB-T (terrestrial digital video broadcast) standard.
- This OFDM modulation is particularly robust, in particular to multipath phenomena.
- reception problems in the context of a portable reception because the transmitted signal is a digital signal and unlike an analog signal whose degradation is gradual, the degradation of a digital signal passes through a transition fast from a quality reception to the total loss of the image.
- the present invention therefore aims to provide a monopole antenna of small dimensions with low production cost and satisfactory performance especially in the context of digital terrestrial television.
- the present invention thus relates to a monopole antenna comprising a radiating element mounted on a base via a mast, characterized in that the radiating element is formed of two U-shaped conducting strands, the length L of each strand being chosen. such that% ⁇ g ⁇ L ⁇ Vi ⁇ g, where ⁇ g is the wavelength in a strand at the central radiation frequency FO.
- This form of monopole antenna makes it possible to save material and thus obtain an antenna with a greater lightness.
- the strands of the monopole antenna have a profile corresponding to a specific folding.
- the antenna strands are folded according to an L-shaped profile, a crenellated profile or also a polygonal or sinusoidal profile.
- the conductive strands are made of metal or a metallized material.
- the base supporting the radiating elements via the mast comprises a metallic plane or metallized material forming a ground plane for the radiating element.
- the metal plane forming a ground plane has dimensions of between 1/5. ⁇ g and 1 / 10. ⁇ g of the wavelength at the central radiation frequency.
- Figure 1 is a schematic perspective view of an antenna according to the present invention.
- FIG. 2 is a diagram giving the adaptation S (1, 1) as a function of frequency for the antenna of FIG. 1.
- FIG. 3 diagrammatically represents the 450MHz and 850MHz radiation patterns obtained by simulating the antenna of FIG. 1.
- FIGS. 4A, 4B and 4C respectively represent an antenna conforming to the antenna of FIG. 1 but with different strand widths, as well as the diagram giving the frequency-dependent adaptation for different strand widths.
- FIGS. 5A, 5B and 5C respectively represent an antenna conforming to the antenna of FIG. 1 but with a spacing between the two variable strands as well as the diagram giving the adaptation as a function of the frequency for different values of the spacing between the strands.
- FIGS. 6A, 6B and 6C respectively represent an antenna conforming to the antenna of FIG. 1 but with a different thickness of strands as well as a diagram giving the adaptation as a function of the frequency for different thicknesses of strands.
- Figure 7 schematically shows another embodiment of an antenna according to the present invention.
- FIG 8 shows schematically yet another embodiment of an antenna according to the present invention.
- FIG. 9 represents an additional embodiment of an antenna according to the present invention
- FIG. 10 represents the adaptation diagram as a function of the frequency of the antenna of FIG. 9.
- the monopole antenna is formed by a radiating element 10 comprising two strands 11 and 12 connected at one end by an element 13 so as to form substantially a U.
- the radiating element 10 is connected via a mast 30 which is fixed on the element 13 to a base 20.
- the radiating element 10 is connected by means of a connection element such as a coaxial cable 40 or any other means such as a microstrip line or the like, making it possible to connect the signal coming from the radiating element to a similar supply device without any adaptation network.
- the two strands 11 and 12 are made of a metallized material or metal and they have a length L such that L is between% ⁇ g and Vz ⁇ g, ⁇ g being the wavelength in the strand at the center frequency FO of radiation.
- this length L is of the order of 3 / 8 ⁇ g at the center frequency FO of radiation.
- the dimensioning of the width I of the strand as well as its thickness e allows the adaptation of the antenna.
- the distance p between the two strands 11, 12 given by the length of the element 13 makes it possible to control the adaptation of the antenna as well as its radiation pattern.
- the base 20 is constituted by a metallic or metallized plane which acts as a ground plane for the radiating element 10 constituted by the two strands 11 and 12.
- the shape and the dimensions of the base are a control parameter of the adaptation of the antenna.
- the base has dimensions of between 1/5. ⁇ g and 1 / 10. ⁇ g where ⁇ g is the wavelength at the central frequency FO of radiation.
- a mast 30 is mounted in the middle of the element 13 and supports the radiating element formed by the two strands 11 and 12.
- the radiating element 10 is connected to a power supply via a coaxial cable 40.
- the base supporting the radiating element has a width of 60mm and a length of 96mm.
- the results of the simulation are given in Figures 2 and 3.
- Figure 2 shows the adaptation S (1, 1) as a function of frequency. This curve shows that a broadband adaptation of the U antenna is obtained, ie more than 68% from 439 MHz to 893 MHz for a reflection coefficient of -1 ODB.
- the antenna must be adapted from 470 MHz to 862 MHz, ie a relative bandwidth required of more than 58%.
- the antenna here being adapted on more than 68%, it is thus usable for the reception of TNT.
- FIG. 3 also shows the radiation pattern of the antenna at 450 MHz and 850 MHz, respectively, and shows that the antenna of FIG. 1 functions as a monopole antenna.
- FIG. 4A shows an antenna 10 of the same type as the antenna of FIG. 1 having two strands 11 and 12 having a width I which, in the embodiment, is chosen to be equal to 37.5mm whereas, on the FIG. 4B shows an antenna 10 'with strands 11' and 12 'having a width equal to 7.3mm.
- Antennas such as those of Figures 4A and 4B with different strand widths were simulated and the matching curves as a function of the frequency shown in Figure 4C were obtained. From these curves, it can be seen that the modification of the width of the vertical strands makes it possible to adjust the adaptation of the curve S (1, 1).
- the width strands is used to control the adaptation of the antenna.
- the width of the strands is between 1 / 10. ⁇ g and 1/100. ⁇ g with ⁇ g the length at the central frequency FO of the radiation.
- FIG. 5A relates to an antenna identical to that of FIG. 1 with a spacing p equal to 20.4 mm
- the spacing P ' is equal to 110 mm for the antenna 10 "
- different spacing values have been simulated with spacings varying in steps of 15 mm
- the results of the simulation are given in FIG.
- the curves show that the space between the vertical strands plays very little on the center frequency, with a variation of 20 MHz between the extreme cases, whereas the phase and the bandwidth are modified according to the spacing between the vertical strands 11 and 12.
- the spacing between the strands from center to center is preferably between 1/20 ⁇ g and 1 A ⁇ g, ⁇ g being the length of wave at the central operating frequency.
- the thickness e of the vertical strands has also been studied.
- the vertical strands 11, 12 of the antenna 10 have a thickness e equal to 0.3 mm while in FIG. 6B the thickness e 'of the vertical strands 11' 'and 12' 'of the antenna 10
- the simulations performed for thicknesses of 0, 3 mm, 2 mm and 4 mm give an adaptation as a function of the frequency as represented in FIG 6 C.
- the variation in thickness also makes it possible to control the adaptation of the antenna but has no significant influence on the radiation patterns
- the thickness of the strands is between 10 ⁇ m and 10 mm.
- the radiating element 100 has two strands having a specific profile, namely an L-shaped profile, each strand having a vertical part 110, 120 and a horizontal part 111, 121.
- the two strands are connected to each other by an element 130 so as to have a shape substantially U.
- the radiating element 100 is mounted on a base 20 by a mast 30 and is connected to a power supply by a coaxial cable 40.
- the length L of the strands vertical 120 and 110 can be reduced compared to the total length L. It is, for example, 105mm with a length for the horizontal portion 111 and 121 strands equal to 75mm.
- An L-shaped profile makes it possible to obtain a more compact antenna.
- FIG 8 shows another embodiment of an antenna according to the present invention.
- the radiating element 200 has two strands connected by an element 230 connected through a mast 30 to a base 20.
- Each strand has a rectilinear portion 210, 220 followed by a crenel portion 211, 221.
- the slots 211, 221 have a length of 36mm and a depth of 20mm in the embodiment shown in Figure 8 the rectilinear portion 210, 220 having a length of 53mm.
- the set gives a length of 146mm. Simulations of this type of antenna give a relative bandwidth of the order of 66%.
- the associated radiation pattern corresponds to that of a monopole type antenna, the antenna having an L-shaped profile having an oblique polarization of particular interest for receiving any type of TNT signals emitted in horizontal or vertical polarization.
- the radiation element 300 comprises two strands 310 and 320 connected by an element 330 connected to a base 20 through a mast 30.
- the two strands 310 and 320 have different lengths L.
- An antenna of this type has been simulated.
- Figure 10 gives the adaptation curve S (1, 1) as a function of the frequency for such an antenna. It can be seen that with this type of antenna we obtain a second adaptation band, namely a first band around 0.35GHz and a second band around O. ⁇ Ghz (if we consider the central frequency for a level of adaptation to -1 OdB). This second adaptation band results from the introduction of a resonant mode between the two strands. This type of antenna is interesting for applications WiFi type in which the antenna must cover the frequency bands around 2.4GHz and 5GHz.
Landscapes
- Details Of Aerials (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06755523A EP1883991A1 (fr) | 2005-05-27 | 2006-05-24 | Antenne monopole |
US11/920,826 US20090102736A1 (en) | 2005-05-27 | 2006-05-24 | Monopole antenna |
JP2008512879A JP2008543145A (ja) | 2005-05-27 | 2006-05-24 | モノポールアンテナ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0551395A FR2886468A1 (fr) | 2005-05-27 | 2005-05-27 | Antenne monopole |
FR0551395 | 2005-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006125925A1 true WO2006125925A1 (fr) | 2006-11-30 |
Family
ID=36128556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2006/001203 WO2006125925A1 (fr) | 2005-05-27 | 2006-05-24 | Antenne monopole |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090102736A1 (fr) |
EP (1) | EP1883991A1 (fr) |
JP (1) | JP2008543145A (fr) |
CN (1) | CN101185199A (fr) |
FR (1) | FR2886468A1 (fr) |
WO (1) | WO2006125925A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2178164A1 (fr) * | 2007-08-10 | 2010-04-21 | Panasonic Corporation | Elément d'antenne et dispositif radio portable |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100848038B1 (ko) * | 2007-02-14 | 2008-07-23 | 주식회사 이엠따블유안테나 | 다중대역 안테나 |
CN101626114B (zh) * | 2008-07-11 | 2013-01-09 | 旭丽电子(广州)有限公司 | 短路单极天线 |
JP5749890B2 (ja) * | 2010-02-12 | 2015-07-15 | 小島プレス工業株式会社 | 車両用アンテナ |
CN102195120B (zh) * | 2010-03-16 | 2013-09-04 | 国民技术股份有限公司 | 一种射频ic卡 |
US8531344B2 (en) * | 2010-06-28 | 2013-09-10 | Blackberry Limited | Broadband monopole antenna with dual radiating structures |
CN102386477A (zh) * | 2011-08-11 | 2012-03-21 | 西北工业大学 | 一种垂直极化宽带uhf波段天线 |
CN115313039B (zh) * | 2022-10-11 | 2023-01-03 | 成都瑞迪威科技有限公司 | 一种宽带斜极化阵列天线 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4396920A (en) * | 1979-12-09 | 1983-08-02 | David Grimberg | Broad-band small-size radio-frequency antenna system |
US4860020A (en) * | 1987-04-30 | 1989-08-22 | The Aerospace Corporation | Compact, wideband antenna system |
WO1996024963A1 (fr) * | 1995-02-06 | 1996-08-15 | Megawave Corporation | Antenne pour verre de fenetre |
DE10150149A1 (de) * | 2001-10-11 | 2003-04-17 | Receptec Gmbh | Antennenmodul |
EP1432071A2 (fr) * | 2002-12-16 | 2004-06-23 | Alps Electric Co., Ltd. | Dispositif d'antenne compacte avec une large gamme de fréquences resonantes |
WO2004082072A1 (fr) * | 2003-03-13 | 2004-09-23 | Kathrein-Werke Kg | Antenne multibande a capacite terminale |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4205851C2 (de) * | 1992-02-26 | 1995-10-12 | Flachglas Ag | In die Fensteröffnung einer metallischen Kraftfahrzeugkarosserie einzusetzende Antennenscheibe |
TWI279025B (en) * | 2004-10-05 | 2007-04-11 | Ind Tech Res Inst | Omnidirectional ultra-wideband monopole antenna |
-
2005
- 2005-05-27 FR FR0551395A patent/FR2886468A1/fr active Pending
-
2006
- 2006-05-24 EP EP06755523A patent/EP1883991A1/fr not_active Withdrawn
- 2006-05-24 US US11/920,826 patent/US20090102736A1/en not_active Abandoned
- 2006-05-24 CN CNA2006800186697A patent/CN101185199A/zh active Pending
- 2006-05-24 JP JP2008512879A patent/JP2008543145A/ja active Pending
- 2006-05-24 WO PCT/FR2006/001203 patent/WO2006125925A1/fr not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4396920A (en) * | 1979-12-09 | 1983-08-02 | David Grimberg | Broad-band small-size radio-frequency antenna system |
US4860020A (en) * | 1987-04-30 | 1989-08-22 | The Aerospace Corporation | Compact, wideband antenna system |
WO1996024963A1 (fr) * | 1995-02-06 | 1996-08-15 | Megawave Corporation | Antenne pour verre de fenetre |
DE10150149A1 (de) * | 2001-10-11 | 2003-04-17 | Receptec Gmbh | Antennenmodul |
EP1432071A2 (fr) * | 2002-12-16 | 2004-06-23 | Alps Electric Co., Ltd. | Dispositif d'antenne compacte avec une large gamme de fréquences resonantes |
WO2004082072A1 (fr) * | 2003-03-13 | 2004-09-23 | Kathrein-Werke Kg | Antenne multibande a capacite terminale |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2178164A1 (fr) * | 2007-08-10 | 2010-04-21 | Panasonic Corporation | Elément d'antenne et dispositif radio portable |
EP2178164A4 (fr) * | 2007-08-10 | 2010-11-03 | Panasonic Corp | Elément d'antenne et dispositif radio portable |
US8325095B2 (en) | 2007-08-10 | 2012-12-04 | Panasonic Corporation | Antenna element and portable radio |
Also Published As
Publication number | Publication date |
---|---|
FR2886468A1 (fr) | 2006-12-01 |
CN101185199A (zh) | 2008-05-21 |
EP1883991A1 (fr) | 2008-02-06 |
US20090102736A1 (en) | 2009-04-23 |
JP2008543145A (ja) | 2008-11-27 |
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