WO2001039321A1 - Antenne accordee par capacite et ensemble antenne - Google Patents
Antenne accordee par capacite et ensemble antenne Download PDFInfo
- Publication number
- WO2001039321A1 WO2001039321A1 PCT/SE2000/002333 SE0002333W WO0139321A1 WO 2001039321 A1 WO2001039321 A1 WO 2001039321A1 SE 0002333 W SE0002333 W SE 0002333W WO 0139321 A1 WO0139321 A1 WO 0139321A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- capacitive load
- ground
- radiating element
- antenna according
- Prior art date
Links
Classifications
-
- 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
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/282—Modifying the aerodynamic properties of the vehicle, e.g. projecting type aerials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
-
- 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
- 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
- H01Q9/36—Vertical arrangement of element with top loading
Definitions
- the present invention relates to a capacitively loaded antenna, and in particular to a capacitively loaded meander antenna, according to the preamble of claim 1.
- the invention also relates to an antenna assembly.
- a general method for optimising an electrically small antenna for common applications is maximising the product of bandwidth and radiation efficiency for the antenna. Occasionally this can be done by decreasing the reactance of the antenna without decreasing, and preferably by increasing, the radiation efficiency. Decreasing the reactance of a monopole antenna can be done by minimising the inductive loading or maximising the capacitive loading. An added capacitive load will optimally reduce the necessary inductive loading for an electrically small self resonant monopole, will give no added losses, and will increase the total currents on the monopole. Together this means that capacitive loading will increase the above mentioned product of bandwidth and radiation efficiency.
- Adding a load, capacitive or inductive, at the top is optimum for radiation efficiency, though other mechanical or matching aspects might exclude such top loading.
- a self resonant electrically small capacitively loaded antenna will still need a minimum amount of inductive loading.
- the present invention seeks to provide an antenna that optimise the use of an electrically small cubic volume available for the antenna, in particular with respect to radiation efficiency and bandwidth.
- the invention is also directed to an antenna assembly including a capacitively loaded antenna.
- An advantage with the present invention is that a simple construction is obtained thus reducing manufacturing costs.
- the antenna may be assembled of flat parts, which are easy to produce and store.
- the antenna may be made very robust only by adding one support.
- a further advantage is that no lumped electric component needs to be added for matching the capacitively top loaded antenna, which is an expensive process in manufacturing.
- Fig. 1 shows a preferred embodiment of the present invention.
- Fig. 2 shows a principal function of the antenna in Fig. 1.
- Fig. 3 shows a second preferred embodiment of the present invention.
- Fig. 4 shows a principal function of the antenna in Fig. 3.
- Fig. 5 shows an antenna assembly including an antenna according to the present invention.
- Fig. 1 shows a preferred embodiment of an antenna 10 according to the present invention.
- the antenna comprises a vertical radiating element 1, having a meandering shape, a top plate 2, referred to as a capacitive load, and a ground plane means 3- 5.
- the ground plane comprises a first ground member 3 arranged in a first plane and a second and a third ground member 4, 5 arranged in a second plane.
- the first ground member has an essentially E-shape and is provided with a grounding point 11 preferably symmetrically arranged.
- a central portion 12 of the E-shape is connected to a first end 13 of the vertical radiating element 1 via a matching means 6.
- the first ground member further provides two essentially identical mirror-inverted branches each having a distal point 14, 15.
- the first ground member 3 is connected to said second 4 ground member at said distal point 14 and said third 5 ground member at said distal point 15, respectively.
- the total length from said grounding point 11 to a free end 16 of said second and third ground member, respectively, via said distal point 14, 15, is set to ⁇ /4, a quarter of a wavelength at the frequency of operation for the antenna 10.
- a feeding point 17 is provided at said first end of the vertical radiating element 1.
- a second end 18 of said radiating element 1 is connected to said capacitive load 2.
- the capacitive load 2 has a first side 7 and a second side 8, where said second side 8 is facing the ground means 3-5 and the first side 7 is facing away from the ground means 3-5.
- the second end 18 of the vertical radiating element 1 is connected to the first side 7 of the capacitive load 2 to allow for a more robust and less compressed meander pattern.
- the vertical radiating element 1 and the capacitive load 2 can preferably be made of a solid metal sheet or a partially coated substrate (e.g. a printed circuit board).
- the ground plane means preferably comprises a substrate, such as a printed circuit board, on which said first ground member 3 is arranged on a first side and said second and third ground member 4, 5 are arranged on a second side.
- the first ground member 3 is connected, at the distal end 14, to the second ground member 4, at an end opposite to said free end 16 through said substrate.
- the first and third ground members are connected is a similar way.
- the matching means 6 is preferably a printed part of the printed circuit board.
- Fig. 2 shows a principal function of the antenna 10 in Fig. 1.
- a coaxial cable 20 is shown in the figure to indicate how to connect a radio communication apparatus (not shown) to the antenna 10.
- a signal connector 21 is connected to the feeding point 17 and a ground connector 22 is connected to the grounding point 11.
- the matching means 6 is illustrated by an inductor between said feeding point 17 and said grounding point 11.
- the meandering patterned vertical radiating element 1 is illustrated by a meandering line between the feeding point 17 and the capacitive load 2, which is illustrated by a strait line.
- the ground plane means comprises the first ground member 3, illustrated by a line, and the second and third ground member 4, 5 are illustrated by separate lines.
- the first ground member 3 may be arranged on top of the second 4 and the third 5 ground members as shown in figure 1, but it is also possible to arrange the second and third ground members on top of the first ground member 3.
- the ground members 3-5 and the capacitive load are preferable arranged in parallel.
- the total height of the antenna 10 is approximately ⁇ /16, a sixteenths of the wavelength at the frequency of operation for the antenna.
- Fig. 3 shows an second embodiment of an antenna 30.
- the antenna comprises the same elements as the antenna described in connection with Fig. 1, but the ground plane means has an alternative shaping.
- the same elements are denoted with the same reference numerals as in Fig. 2.
- the ground plane means comprises a first member 30 having an open circular shape, where the matching means 6 is connected to a connection at a first end 31 of the first ground member 30 and a second end 32 of the first ground member 30 is provided with a connection 33 to a second ground member 40.
- the second ground member is a flat surface having substantially the same outer dimensions as the first ground member 30.
- the connection 33 from the first to the second ground member is located essentially at the centre of the second ground member 40.
- the grounding point 11 and the feeding point 17 are located at the same place as in Fig. 1.
- Fig. 4 shows the principal function of the antenna in Fig. 3.
- the alternative shape of the ground means is illustrated by a meandering line from the grounding portion 11, corresponding to the first ground member 30, down to a centre portion of a straight line, corresponding to the second ground member 40.
- Fig. 5 shows an antenna assembly 50, especially adapted for mounting on a vehicle body, e.g. on the roof of a car.
- a GPS antenna 52 is also provided and mounted on the base 51.
- An coaxial antenna cable 54 comprising a ground connector and a signal connector, is arranged to be connected to the grounding point and the feeding point, respectively, of the antenna 10.
- the assembly 50 is covered and protective by a housing 55.
- a dielectric support 56 is mounted on the base 51 and is attached at its upper end to the top load 2.
- the top load 2 will be steadily fixed and will also serve to support the radiating element 1.
- Such a support or similar could advantageously also be used in the previous embodiments.
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU17498/01A AU1749801A (en) | 1999-11-29 | 2000-11-27 | Capacitively loaded antenna and an antenna assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904320A SE515504C2 (sv) | 1999-11-29 | 1999-11-29 | Kapacitivt belastad antenn och ett antennaggregat |
SE9904320-0 | 1999-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001039321A1 true WO2001039321A1 (fr) | 2001-05-31 |
Family
ID=20417893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/002333 WO2001039321A1 (fr) | 1999-11-29 | 2000-11-27 | Antenne accordee par capacite et ensemble antenne |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1749801A (fr) |
SE (1) | SE515504C2 (fr) |
WO (1) | WO2001039321A1 (fr) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002065582A1 (fr) * | 2001-02-13 | 2002-08-22 | Koninklijke Philips Electronics N.V. | Terminal sans fil |
WO2003098735A1 (fr) * | 2002-05-16 | 2003-11-27 | Kathrein-Werke Kg | Antenne de toit pour vehicules automobiles |
DE20311035U1 (de) * | 2003-07-17 | 2004-04-08 | Kathrein-Werke Kg | Antennenanordnung, insbesondere für Kraftfahrzeuge |
EP1411585A1 (fr) * | 2002-10-15 | 2004-04-21 | Calearo S.r.l. | Revêtement pour antennes de véhicule |
EP1432071A2 (fr) * | 2002-12-16 | 2004-06-23 | Alps Electric Co., Ltd. | Dispositif d'antenne compacte avec une large gamme de fréquences resonantes |
EP1437795A1 (fr) * | 2002-06-27 | 2004-07-14 | Matsushita Electric Industrial Co., Ltd. | Dispositif antenne |
EP1306924A3 (fr) * | 2001-10-24 | 2004-10-27 | Alps Electric Co., Ltd. | Antenne monopole de hauteur facilement réductible |
EP1683231A1 (fr) * | 2003-10-30 | 2006-07-26 | Wavetest Systems, Inc. | Antenne haute performance |
US7362283B2 (en) | 2001-09-13 | 2008-04-22 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
EP1597794B1 (fr) * | 2003-02-19 | 2008-08-20 | Fractus S.A. | Antenne miniature a structure volumetrique |
US7486242B2 (en) | 2002-06-25 | 2009-02-03 | Fractus, S.A. | Multiband antenna for handheld terminal |
US7928915B2 (en) | 2004-09-21 | 2011-04-19 | Fractus, S.A. | Multilevel ground-plane for a mobile device |
US8941541B2 (en) | 1999-09-20 | 2015-01-27 | Fractus, S.A. | Multilevel antennae |
JP2017108395A (ja) * | 2015-11-27 | 2017-06-15 | 原田工業株式会社 | 低背型アンテナ装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985002719A1 (fr) * | 1983-12-05 | 1985-06-20 | Motorola, Inc. | Antenne d'emetteur-recepteur a bande double |
GB2258952A (en) * | 1991-08-20 | 1993-02-24 | Marconi Gec Ltd | Antennas |
US5278572A (en) * | 1990-11-01 | 1994-01-11 | Harada Kogyo Kabushiki Kaisha | Antenna coupling circuit using capacitive coupling |
-
1999
- 1999-11-29 SE SE9904320A patent/SE515504C2/sv unknown
-
2000
- 2000-11-27 WO PCT/SE2000/002333 patent/WO2001039321A1/fr active Application Filing
- 2000-11-27 AU AU17498/01A patent/AU1749801A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985002719A1 (fr) * | 1983-12-05 | 1985-06-20 | Motorola, Inc. | Antenne d'emetteur-recepteur a bande double |
US5278572A (en) * | 1990-11-01 | 1994-01-11 | Harada Kogyo Kabushiki Kaisha | Antenna coupling circuit using capacitive coupling |
GB2258952A (en) * | 1991-08-20 | 1993-02-24 | Marconi Gec Ltd | Antennas |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9761934B2 (en) | 1999-09-20 | 2017-09-12 | Fractus, S.A. | Multilevel antennae |
US9240632B2 (en) | 1999-09-20 | 2016-01-19 | Fractus, S.A. | Multilevel antennae |
US10056682B2 (en) | 1999-09-20 | 2018-08-21 | Fractus, S.A. | Multilevel antennae |
US9000985B2 (en) | 1999-09-20 | 2015-04-07 | Fractus, S.A. | Multilevel antennae |
US8976069B2 (en) | 1999-09-20 | 2015-03-10 | Fractus, S.A. | Multilevel antennae |
US9054421B2 (en) | 1999-09-20 | 2015-06-09 | Fractus, S.A. | Multilevel antennae |
US9362617B2 (en) | 1999-09-20 | 2016-06-07 | Fractus, S.A. | Multilevel antennae |
US8941541B2 (en) | 1999-09-20 | 2015-01-27 | Fractus, S.A. | Multilevel antennae |
WO2002065582A1 (fr) * | 2001-02-13 | 2002-08-22 | Koninklijke Philips Electronics N.V. | Terminal sans fil |
US7522936B2 (en) | 2001-02-13 | 2009-04-21 | Nxp B.V. | Wireless terminal |
US7688276B2 (en) | 2001-09-13 | 2010-03-30 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
US7362283B2 (en) | 2001-09-13 | 2008-04-22 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
US7911394B2 (en) | 2001-09-13 | 2011-03-22 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
US8581785B2 (en) | 2001-09-13 | 2013-11-12 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
EP1306924A3 (fr) * | 2001-10-24 | 2004-10-27 | Alps Electric Co., Ltd. | Antenne monopole de hauteur facilement réductible |
WO2003098735A1 (fr) * | 2002-05-16 | 2003-11-27 | Kathrein-Werke Kg | Antenne de toit pour vehicules automobiles |
US7486242B2 (en) | 2002-06-25 | 2009-02-03 | Fractus, S.A. | Multiband antenna for handheld terminal |
US7903037B2 (en) | 2002-06-25 | 2011-03-08 | Fractus, S.A. | Multiband antenna for handheld terminal |
EP1437795A4 (fr) * | 2002-06-27 | 2008-12-10 | Panasonic Corp | Dispositif antenne |
EP1437795A1 (fr) * | 2002-06-27 | 2004-07-14 | Matsushita Electric Industrial Co., Ltd. | Dispositif antenne |
EP1411585A1 (fr) * | 2002-10-15 | 2004-04-21 | Calearo S.r.l. | Revêtement pour antennes de véhicule |
EP1432071A3 (fr) * | 2002-12-16 | 2004-07-07 | Alps Electric Co., Ltd. | Dispositif d'antenne compacte avec une large gamme de fréquences resonantes |
EP1432071A2 (fr) * | 2002-12-16 | 2004-06-23 | Alps Electric Co., Ltd. | Dispositif d'antenne compacte avec une large gamme de fréquences resonantes |
US8593349B2 (en) | 2003-02-19 | 2013-11-26 | Fractus, S.A. | Miniature antenna having a volumetric structure |
US8149171B2 (en) | 2003-02-19 | 2012-04-03 | Fractus, S.A. | Miniature antenna having a volumetric structure |
US7504997B2 (en) | 2003-02-19 | 2009-03-17 | Fractus, S.A. | Miniature antenna having a volumetric structure |
EP1912280A3 (fr) * | 2003-02-19 | 2008-10-22 | Fractus, S.A. | Antenne miniature ayant une structure volumétrique |
EP1597794B1 (fr) * | 2003-02-19 | 2008-08-20 | Fractus S.A. | Antenne miniature a structure volumetrique |
US7030821B2 (en) | 2003-07-17 | 2006-04-18 | Kathrein-Werke Kg | Antenna arrangement for motor vehicles |
DE20311035U1 (de) * | 2003-07-17 | 2004-04-08 | Kathrein-Werke Kg | Antennenanordnung, insbesondere für Kraftfahrzeuge |
EP1683231A4 (fr) * | 2003-10-30 | 2008-01-23 | Wavetest Systems Inc | Antenne haute performance |
EP1683231A1 (fr) * | 2003-10-30 | 2006-07-26 | Wavetest Systems, Inc. | Antenne haute performance |
US7928915B2 (en) | 2004-09-21 | 2011-04-19 | Fractus, S.A. | Multilevel ground-plane for a mobile device |
JP2017108395A (ja) * | 2015-11-27 | 2017-06-15 | 原田工業株式会社 | 低背型アンテナ装置 |
Also Published As
Publication number | Publication date |
---|---|
AU1749801A (en) | 2001-06-04 |
SE515504C2 (sv) | 2001-08-20 |
SE9904320L (sv) | 2001-05-30 |
SE9904320D0 (sv) | 1999-11-29 |
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