EP1226623B1 - Plate antenna - Google Patents

Plate antenna Download PDF

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Publication number
EP1226623B1
EP1226623B1 EP00972955A EP00972955A EP1226623B1 EP 1226623 B1 EP1226623 B1 EP 1226623B1 EP 00972955 A EP00972955 A EP 00972955A EP 00972955 A EP00972955 A EP 00972955A EP 1226623 B1 EP1226623 B1 EP 1226623B1
Authority
EP
European Patent Office
Prior art keywords
antenna
radiator
radiators
height
slot
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.)
Expired - Lifetime
Application number
EP00972955A
Other languages
German (de)
French (fr)
Other versions
EP1226623A1 (en
Inventor
Veijo Haapanen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cojot Oy
Original Assignee
Cojot Oy
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 Cojot Oy filed Critical Cojot Oy
Publication of EP1226623A1 publication Critical patent/EP1226623A1/en
Application granted granted Critical
Publication of EP1226623B1 publication Critical patent/EP1226623B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 .
  • US 5,828,340 discloses a wideband antenna has a planar conductive tab, a planar ground plane and transmission line.
  • the conductive tab is sub-wavelength in all dimensions and has a top edge that is wider than its bottom end. The width of the conductive tab tapers from the top edge to the bottom end.
  • the ground plane is parallel with and located below the conductive tab.
  • the wideband antenna called a tab monopole, is planar in form enabling it to be readily manufactured using standard printed circuit board methods and facilitating its integration with packages and radio frequency circuitry used to feed the antenna.
  • 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 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 4.
  • the antenna as a whole also functions as a wide-band dipole antenna.
  • 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)

Description

  • 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 . US 5,828,340 discloses a wideband antenna has a planar conductive tab, a planar ground plane and transmission line. The conductive tab is sub-wavelength in all dimensions and has a top edge that is wider than its bottom end. The width of the conductive tab tapers from the top edge to the bottom end. The ground plane is parallel with and located below the conductive tab. The wideband antenna, called a tab monopole, is planar in form enabling it to be readily manufactured using standard printed circuit board methods and facilitating its integration with packages and radio frequency circuitry used to feed the antenna. 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.
  • Other preferred embodiments of the invention are presented in the subclaims.
  • 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. In addition, the antenna is of a very small size and simple and light construction in relation to its very wide frequency range and radiation efficiency. In addition, 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.
  • In the following, the invention will be described in detail by the aid of an example with reference to the drawings, wherein
    • 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. In addition, above 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 4. Thus, besides working like a discone antenna, the antenna as a whole also functions as a wide-band dipole antenna.
  • 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. In addition, together with the radiators, 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. Measured from above, the horizontal radiation pattern 15 is a nearly circular pattern just inside the outermost circle, between 0 -- 6 dB. Measured laterally, 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. In addition, with the structure of the invention, the frequency range is extended at the lower end as compared with known discone antennas.
  • It is obvious to the person skilled in the art that different embodiments of the invention are not restricted to the examples described above, but that they can be varied within the scope of the presented below.

Claims (5)

  1. Plate antenna (1) comprising a first radiator (3) and a second radiator (4) electrically isolated from each other, the width of first radiator (3) increasing in the direction away from the other radiator as in a cone antenna, said radiators (3,4) being film-like elements fitted in the same plane on a circuit board (5) made of a dielectric material,
    wherein the second radiator (4) is of a rectangular shape, and
    wherein the first radiator (3) comprises a rectangular extension (7), characterized in that the rectangular extension (7) and the second radiator (4) have equal widths so that the antenna also functions as a wide-band dipole antenna.
  2. Antenna as defined in claim 1, characterized in that the height of the second radiator is substantially 1/3 and the height of the first radiator is substantially 2/3 of the total height of the radiators, so that the antenna also functions as a Windom antenna.
  3. Antenna as defined in claim 1, characterized in that it has a slot (8) between the radiators, so that it also functions as a slot antenna.
  4. Antenna as defined in claim 3, characterized in that the width of the antenna equals substantially 1/4 of the maximum wavelength in the frequency range of the antenna.
  5. Plate antenna (1) according to one of the preceding claims 1 to 3,
    characterized in that
    the height of the second radiator is substantially 1/3 and the height of the first radiator is substantially 2/3 of the total height of the radiators, and
    the antenna has a slot (8) between the radiators, so that the antenna also functions as a wide-band dipole antenna, a Windom antenna and a slot antenna.
EP00972955A 1999-11-03 2000-11-02 Plate antenna Expired - Lifetime EP1226623B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI992374A FI113103B (en) 1999-11-03 1999-11-03 slice Tin
FI992374 1999-11-03
PCT/FI2000/000956 WO2001037372A1 (en) 1999-11-03 2000-11-02 Plate antenna

Publications (2)

Publication Number Publication Date
EP1226623A1 EP1226623A1 (en) 2002-07-31
EP1226623B1 true 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)

* Cited by examiner, † Cited by third party
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
CA2699680C (en) * 2007-10-08 2016-06-07 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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
WO2001037372A1 (en) 2001-05-25
FI113103B (en) 2004-02-27
DE60036557D1 (en) 2007-11-08
DE60036557T2 (en) 2008-07-24
EP1226623A1 (en) 2002-07-31
FI19992374A (en) 2001-05-04

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