EP1226623A1 - Plate antenna - Google Patents
Plate antennaInfo
- Publication number
- EP1226623A1 EP1226623A1 EP00972955A EP00972955A EP1226623A1 EP 1226623 A1 EP1226623 A1 EP 1226623A1 EP 00972955 A EP00972955 A EP 00972955A EP 00972955 A EP00972955 A EP 00972955A EP 1226623 A1 EP1226623 A1 EP 1226623A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- radiator
- radiators
- functions
- width
- 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
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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
-
- 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
- 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
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
Definitions
- the present invention relates to a plate antenna.
- the traditional discone antenna consists of a metallic cone and a horizontal round metal disk placed symmetrically near its apex and electrically isolated from the cone. Instead of a disk and a cone, it is possible to use a corresponding construction consisting of a plurality of radial elements. The disk and the cone are fed in opposite phase.
- a discone antenna of this type is presented e.g. in US patent specification 4,851,859. Previously known discone antennas have the drawbacks of a large size and a complex construction.
- the object of the present invention is to eliminate the drawbacks of prior-art solutions and to achieve a completely new type of wide-band plate antenna that combines the advantages of the discone antenna, dipole antenna, Windom antenna as well as the slot antenna.
- the antenna of the invention is implemented using a film-like planar antenna pattern fitted on a printed circuit board or equivalent. The details of the features of the plate antenna of the invention are presented in the characterization part of claim 1.
- the antenna of the invention With the antenna of the invention, a very wide frequency range is achieved, e.g. a range of 350 - 3000 MHz, and its width can be further increased e.g. towards lower frequencies by increasing the dimensions of the antenna, without simultaneously lowering the upper frequency.
- the antenna is of a very small size and simple and light construction in relation to its very wide frequency range and radiation efficiency.
- its dipole type radiation pattern is very advantageous in many uses, e.g. in underground tunnels where the radio field is weak.
- the antenna of the invention can also be provided with a protective casing, giving it a good protection against external damage.
- Fig. 1 presents a front view of an encased plate antenna with the casing sectioned longitudinally
- Fig. 2 presents a side view of an antenna as in Fig. 1 with the casing longitudinally sectioned, and
- Fig. 3 presents an example of a radiation pattern for a antenna according to the invention.
- Fig. 1 and 2 illustrate a plate antenna 1 which can be used e.g. in the frequency range of 350 MHz - 3 GHz as radiators in an internal coverage system.
- the antenna 1 comprises an upper radiator 3 laid in a position transverse to the vertical center axis 2 of the antenna, and a lower radiator 4 electrically isolated from the upper radiator and having a downward tapering shape.
- Both the upper and the lower radiators 3,4 are films made of electrically conductive material, e.g. copper, arranged in the same plane on a vertical printed circuit board 5 of a rectangular form.
- the printed circuit board 5 may consist of P4 circuit board, which is cheap, and it may have a height of e.g. about 270 mm and a width of e.g. about 160 mm.
- the lower radiator 4 has a rectangular shape. Its width (in the horizontal direction) equals about 1/4 of the maximum wavelength in the frequency range of the antenna, e.g. about 140 mm, and its height e.g. about 85 mm.
- the upper radiator 3 comprises a pointed part 6 as in a discone antenna, whose width increases from the apex upwards at an angle A, e.g. 60 °, like the cross-section of a cone.
- this part 6 there is a rectangular part 7 forming an extension of part 6 and having a width equal to its upper edge and also equal to the width of the lower radiator 3.
- the height of the upper radiator is about 2/3 and that of the lower radiator about 1/3 of the total height of the antenna radiators, and the upper radiator 3 may have a total height of e.g. 170 mm, in which case the antenna will also work as a Windom antenna.
- the slot 8 between the upper and lower radiators forms a slot antenna.
- the printed circuit board 5 with the radiators 3, 4 has been fitted inside a plastic casing 9, the radiators and circuit board being thus mechanically well protected.
- the plastic casing 9 can be fastened e.g. with screws (not shown) to a base 10.
- a connection cable 11 can be connected from the radiators 3, 4 to a cable connector 12 at the lower edge of the protective casing 9.
- the inner conductor of the cable 11 is connected via a coupling 13 (soldered or the like) to the lower part of the upper radiator 3, and the shield is connected via a second coupling 14 to the upper part of the lower radiator 4.
- the matching impedance is directly 50 ohm, so connecting it to a standard high-frequency environment is very easy.
- Fig. 3 presents the vertical radiation pattern for an antenna according to the invention for a frequency of 451 MHz when the maximum amplitude is about 45.38 dB and the minimum amplitude 7.88 dB.
- the outermost circle corresponds to 45.31 dB.
- the horizontal radiation pattern 15 is a nearly circular pattern just inside the outermost circle, between 0 - 6 dB.
- the radiation pattern 16 resembles the radiation pattern produced by a dipole at the frequency in question, the radiation at the extreme points almost reaching the outermost circle, so the antenna has directional properties corresponding to a dipole antenna.
- the frequency range is extended at the lower end as compared with known discone antennas.
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI992374 | 1999-11-03 | ||
FI992374A FI113103B (en) | 1999-11-03 | 1999-11-03 | slice Tin |
PCT/FI2000/000956 WO2001037372A1 (en) | 1999-11-03 | 2000-11-02 | Plate antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1226623A1 true EP1226623A1 (en) | 2002-07-31 |
EP1226623B1 EP1226623B1 (en) | 2007-09-26 |
Family
ID=8555553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00972955A Expired - Lifetime EP1226623B1 (en) | 1999-11-03 | 2000-11-02 | Plate antenna |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1226623B1 (en) |
DE (1) | DE60036557T2 (en) |
FI (1) | FI113103B (en) |
WO (1) | WO2001037372A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE363744T1 (en) * | 2002-05-10 | 2007-06-15 | Hirschmann Electronics Gmbh | POLYTICAL ANTENNA |
DE10341964A1 (en) * | 2003-09-11 | 2005-05-12 | Hirschmann Electronics Gmbh | Antenna for DVB-T reception |
JP2005094437A (en) * | 2003-09-18 | 2005-04-07 | Mitsumi Electric Co Ltd | Antenna for uwb |
GB2427966B (en) * | 2003-09-22 | 2007-05-16 | Thales Holdings Uk Plc | An antenna |
JP3964382B2 (en) * | 2003-11-11 | 2007-08-22 | ミツミ電機株式会社 | Antenna device |
FR2871619A1 (en) * | 2004-06-09 | 2005-12-16 | Thomson Licensing Sa | BROADBAND ANTENNA WITH OMNIDIRECTIONAL RADIATION |
US8427373B2 (en) | 2007-10-08 | 2013-04-23 | Sensormatic Electronics, Llc. | RFID patch antenna with coplanar reference ground and floating grounds |
JP4528848B2 (en) * | 2008-06-30 | 2010-08-25 | 株式会社東芝 | Connection structure of antenna element and coaxial connector |
CN105977608B (en) * | 2016-06-14 | 2019-05-31 | 佛山市粤海信通讯有限公司 | A kind of 30 ° of gain suppressive all-around top absorbing antennas |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5521606A (en) * | 1992-02-05 | 1996-05-28 | Nippon Sheet Glass Co., Ltd. | Window glass antenna for motor vehicles |
US5255022A (en) * | 1992-04-02 | 1993-10-19 | Xerox Corporation | Ink manifold having elastomer channel plate for ink jet printhead and process for making |
DE4324480C2 (en) * | 1993-07-21 | 1997-07-17 | Hirschmann Richard Gmbh Co | Antenna arrangement |
US5872543A (en) * | 1995-03-06 | 1999-02-16 | Smith; Ralph L. | Smithdom multiband antenna |
US5828340A (en) * | 1996-10-25 | 1998-10-27 | Johnson; J. Michael | Wideband sub-wavelength antenna |
-
1999
- 1999-11-03 FI FI992374A patent/FI113103B/en active
-
2000
- 2000-11-02 EP EP00972955A patent/EP1226623B1/en not_active Expired - Lifetime
- 2000-11-02 DE DE60036557T patent/DE60036557T2/en not_active Expired - Lifetime
- 2000-11-02 WO PCT/FI2000/000956 patent/WO2001037372A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0137372A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001037372A1 (en) | 2001-05-25 |
FI19992374A (en) | 2001-05-04 |
DE60036557T2 (en) | 2008-07-24 |
EP1226623B1 (en) | 2007-09-26 |
FI113103B (en) | 2004-02-27 |
DE60036557D1 (en) | 2007-11-08 |
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