EP1936738A1 - Antenne à plaques en microruban - Google Patents

Antenne à plaques en microruban Download PDF

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Publication number
EP1936738A1
EP1936738A1 EP06077278A EP06077278A EP1936738A1 EP 1936738 A1 EP1936738 A1 EP 1936738A1 EP 06077278 A EP06077278 A EP 06077278A EP 06077278 A EP06077278 A EP 06077278A EP 1936738 A1 EP1936738 A1 EP 1936738A1
Authority
EP
European Patent Office
Prior art keywords
patch antenna
conducting area
microstrip patch
transmission line
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.)
Withdrawn
Application number
EP06077278A
Other languages
German (de)
English (en)
Inventor
Johannes Adrianus Cornelis Theeuwes
Hubregt Jannis Visser
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
TNO Institute of Industrial Technology
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
TNO Institute of Industrial Technology
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO, TNO Institute of Industrial Technology filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP06077278A priority Critical patent/EP1936738A1/fr
Priority to EP07851920A priority patent/EP2127023A1/fr
Priority to PCT/NL2007/050660 priority patent/WO2008075946A1/fr
Publication of EP1936738A1 publication Critical patent/EP1936738A1/fr
Withdrawn legal-status Critical Current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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • 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

Definitions

  • the invention relates to a microstrip patch antenna, comprising a substantially rectangular electrically conducting area connected to a transmission line, the conducting area having a length and a width wherein the length substantially equals half a wavelength of a radio wave in the substrate to be received by the microstrip patch antenna.
  • Such a microstrip patch antenna is e.g. known from the US patent application US 2004119645 for providing a relatively small, flat and relatively cheap antenna. Such antennas are widely used for mobile communication devices.
  • microstrip patch antennas provide inherently a narrow bandwidth.
  • the microstrip patch antenna disclosed in US 2004119645 comprises a sandwich layer structure to enhance bandwidth properties.
  • Other techniques to improve the poor bandwidth of patch antennas encompass providing self supporting structures, employing short circuit pins or walls, using one or a multiple number of feeding probes extending through a substrate on which the patch antenna is formed, providing a relatively thick dielectric, non-planar antennas, using wirebond techniques, using a metal box, and/or providing a complex matching network that is larger than the antenna. All these techniques enlarge production costs significantly.
  • the invention aims at obtaining a microstrip patch antenna according to the preamble wherein a bandwidth is increased while production costs do not significantly increase.
  • a width to length ratio of the conducting area is larger than approximately 1.5.
  • the substantially conducting area such that a width to length ratio of the conducting area is larger than approximately 1.5, not only a desired electromagnetic resonance mode of the antenna operating frequency occurs in the conducting area, also other resonance modes may occur.
  • the invention is at least partly based on the insight that by simultaneously exciting at least two resonance modes of the conducting area, the bandwidth of the patch antenna increases significantly while the input impedance of the patch antenna may remain constant. Obviously, costs for manufacturing the microstrip patch antenna may substantially remain the same.
  • the width to length ratio should always be smaller than approximately 1.5. in order to suppress higher order modes occurring in the conducting area of the patch antenna, is overcome.
  • microstrip patch antenna according to the invention can advantageously be used for mobile communication devices, especially for relatively wideband wireless communication applications.
  • Examples of relatively wideband wireless communication devices are PDA's or mobile telephones.
  • the bandwidth of the antenna can increase significantly.
  • an impedance match with the transmission line can be obtained without reducing the bandwidth of the patch antenna. This way, the bandwidth of the microstrip patch antenna can be optimized.
  • the transmission line is implemented using microstrip technology, so that the patch antenna and the transmission line can be made using the same production steps, thereby decreasing manufacturing costs of the microstrip patch antenna. It is noted, however, that also other types of transmission lines might be used, such as a coax cable element.
  • Figure 1 shows a first embodiment of a microstrip patch antenna 1 according to the invention.
  • the antenna 1 comprises a substantially rectangular electrically conducting area 2 having a length 1 and a width w.
  • the conducting area is connected to a transmission line 3 for further transmission at an interconnection location 4.
  • the length of the conducting area 2 substantially equals half a wavelength of a radio wave in the substrate to be received by the microstrip patch antenna 1.
  • the width w of the conducting area is larger than approximately 1.5 to admit at least two resonance modes in the conducting area 2 excited by an incidence radio wave.
  • the transmission line 3 and the conducting area 2 are realized using microstrip technology.
  • a ground plate of a printed circuit board serves as the earth, while on the opposite side of the board an electrically conducting pattern is printed.
  • the printed circuit board has dielectric properties to electromagnetically couple the printed pattern and the ground plate.
  • the transmission line 5 is formed as a printed track, while the antenna patch is realized for optimal receipt and transmission of radio waves around a predetermined central frequency f 0 , e.g. 2.45 GHz. It is noted, however, that also other techniques could be used, such as etching techniques for forming the structures on the printed circuit board.
  • the material of the printed circuit board is the widely used FR4. Obviously, also other printed circuit board types could be used, such as a microwave laminated substrate.
  • the length 1 to width w ratio of the substantially rectangular conducting area 2 is a design parameter for optimizing the bandwidth of the microstrip patch antenna 1.
  • Figure 2 shows a reflection graph 5 of the patch antenna 1 wherein a reflection parameter R is depicted as a function of frequency f.
  • the graph is substantially constant for relatively low and high frequencies at a constant level r 0 and has a dip at the central frequency f 0 where the patch antenna 1 is operable.
  • the bandwidth of the patch antenna is defined as frequency band where the graph 5 is 10 dB below the constant level r 0 . In practice, prior art patch antennas have a bandwidth of approximately 1%.
  • Fig. 3 shows an additional reflection graph 5 of a patch antenna 1 similar to the antenna 1 shown in Figure 1 . Due to the non-symmetrical behaviour of the reflection graph a subtle choice of the length 1 to width w ratio of the conducting area 2 might lead to a relatively large bandwidth.
  • the interconnection location 4 of the conducting area 2 and the transmission line 3 might be used as a design parameter for selecting an input impedance of the conducting area 2.
  • impedances of the conducting area 2 and the transmission line 3 can optimally be matched, thereby reducing matching losses while maintaining the bandwidth of the patch antenna.
  • the input characteristic impedance of the conducting area 1 may be chosen as circa 50 ⁇ to match common transmission line characteristics.
  • the interconnection location 4 of the conducting area 2 and the transmission line 3 is near an edge 6 of the conducting area 2 so that a simple layout is obtained.
  • Figure 4 and 5 show a second and a third embodiment of a microstrip patch antenna 1 according to the invention wherein the interconnection location 4 of the conducting area 2 and the transmission line 3 are elsewhere, viz. in an inner region of the conducting area 2.
  • the transmission line 3 enters the inner region of the conducting area 2 via a gap 7 in the conducting area 2.
  • the transmission line enters the inner region of the conducting area 2 via a path outside the plane wherein the conducting area 2 on the printed circuit board extends.
  • geometries of the antenna patches can also be designed for performing wireless communication using radio waves having other frequencies, e.g. more or less than 2.45 GHz.

Landscapes

  • Waveguide Aerials (AREA)
EP06077278A 2006-12-20 2006-12-20 Antenne à plaques en microruban Withdrawn EP1936738A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP06077278A EP1936738A1 (fr) 2006-12-20 2006-12-20 Antenne à plaques en microruban
EP07851920A EP2127023A1 (fr) 2006-12-20 2007-12-18 Antenne à raccord provisoire de guide à rubans
PCT/NL2007/050660 WO2008075946A1 (fr) 2006-12-20 2007-12-18 Antenne à raccord provisoire de guide à rubans

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06077278A EP1936738A1 (fr) 2006-12-20 2006-12-20 Antenne à plaques en microruban

Publications (1)

Publication Number Publication Date
EP1936738A1 true EP1936738A1 (fr) 2008-06-25

Family

ID=37726629

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06077278A Withdrawn EP1936738A1 (fr) 2006-12-20 2006-12-20 Antenne à plaques en microruban
EP07851920A Withdrawn EP2127023A1 (fr) 2006-12-20 2007-12-18 Antenne à raccord provisoire de guide à rubans

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP07851920A Withdrawn EP2127023A1 (fr) 2006-12-20 2007-12-18 Antenne à raccord provisoire de guide à rubans

Country Status (2)

Country Link
EP (2) EP1936738A1 (fr)
WO (1) WO2008075946A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8659498B2 (en) 2007-10-19 2014-02-25 Board Of Trustees Operating Michigan State University Variable frequency patch antenna
EP4181318A4 (fr) * 2021-11-01 2024-02-28 Calterah Semiconductor Tech Shanghai Co Ltd Antenne microruban, antenne réseau, radar, et véhicule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947850A (en) * 1975-04-24 1976-03-30 The United States Of America As Represented By The Secretary Of The Navy Notch fed electric microstrip dipole antenna
US3972050A (en) * 1975-04-24 1976-07-27 The United States Of America As Represented By The Secretary Of The Navy End fed electric microstrip quadrupole antenna
US6369760B1 (en) * 1999-07-12 2002-04-09 The United States Of America As Represented By The Secretary Of The Army Compact planar microstrip antenna
US20060097926A1 (en) * 2004-11-05 2006-05-11 Tomoharu Fujii Patch antenna, array antenna, and mounting board having the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947850A (en) * 1975-04-24 1976-03-30 The United States Of America As Represented By The Secretary Of The Navy Notch fed electric microstrip dipole antenna
US3972050A (en) * 1975-04-24 1976-07-27 The United States Of America As Represented By The Secretary Of The Navy End fed electric microstrip quadrupole antenna
US6369760B1 (en) * 1999-07-12 2002-04-09 The United States Of America As Represented By The Secretary Of The Army Compact planar microstrip antenna
US20060097926A1 (en) * 2004-11-05 2006-05-11 Tomoharu Fujii Patch antenna, array antenna, and mounting board having the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PAN S-C ET AL: "SINGLE-FEED DUAL-FREQUENCY MICROSTRIP ANTENNA WITH TWO PATCHES", IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM. 1999 DIGEST. APS. ORLANDO, FL, JULY 11 - 16, 1999, NEW YORK, NY : IEEE, US, vol. VOL. 3, 11 July 1999 (1999-07-11), pages 1644 - 1647, XP000927156, ISBN: 0-7803-5640-3 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8659498B2 (en) 2007-10-19 2014-02-25 Board Of Trustees Operating Michigan State University Variable frequency patch antenna
EP4181318A4 (fr) * 2021-11-01 2024-02-28 Calterah Semiconductor Tech Shanghai Co Ltd Antenne microruban, antenne réseau, radar, et véhicule

Also Published As

Publication number Publication date
EP2127023A1 (fr) 2009-12-02
WO2008075946A1 (fr) 2008-06-26

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