EP1750325B1 - Multiband-Antenne - Google Patents

Multiband-Antenne Download PDF

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Publication number
EP1750325B1
EP1750325B1 EP20060291225 EP06291225A EP1750325B1 EP 1750325 B1 EP1750325 B1 EP 1750325B1 EP 20060291225 EP20060291225 EP 20060291225 EP 06291225 A EP06291225 A EP 06291225A EP 1750325 B1 EP1750325 B1 EP 1750325B1
Authority
EP
European Patent Office
Prior art keywords
antenna
zone
radiating element
ground plane
frequency
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.)
Active
Application number
EP20060291225
Other languages
English (en)
French (fr)
Other versions
EP1750325A1 (de
Inventor
Fernando Romao
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.)
Vallaroche SAS
Original Assignee
Sagem Mobiles SA
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 Sagem Mobiles SA filed Critical Sagem Mobiles SA
Publication of EP1750325A1 publication Critical patent/EP1750325A1/de
Application granted granted Critical
Publication of EP1750325B1 publication Critical patent/EP1750325B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

Definitions

  • the present invention relates to a patch antenna of reduced size adapted to resonate according to at least one resonance frequency while respecting the regulations in force concerning the protection of the health of users.
  • a mobile phone is a radio frequency communication device that includes metal elements such as a printed circuit, a battery, etc., and an antenna intended to resonate at least one resonant frequency.
  • metal elements such as a printed circuit, a battery, etc.
  • an antenna intended to resonate at least one resonant frequency.
  • a mobile phone resonates according to two frequencies whose values are most often of the order of 1GHz (low frequency) and 2 GHz (high frequency), it is called dual-band antenna.
  • the European patent EP 1113524 describes an internal multi-band antenna for mobile phone.
  • the Fig. 1 represents a block diagram of an example of a dual-band A1 patch antenna according to the state of the art.
  • the patch antenna A1 is also constituted by a ground plane PM whose geometric dimensions are most often limited by the geometric dimensions of the mobile phone and a radiating element ER positioned parallel to the ground plane PM, situated at a distance of distance d of said ground plane (typically a few millimeters) and vis-à-vis said ground plane.
  • the shape and the geometrical dimensions of the radiating element ER are determined in such a way that the antenna A1 (ground plane PM and radiating element ER) can resonate according to, on the one hand, a low resonance frequency and, on the other hand, a high resonance frequency when the resonant element ER is excited by a radiofrequency signal at an excitation point E and that said radiating element ER is connected to a ground potential at a point of mass R.
  • the resonant element ER can be considered from a radiofrequency point as consisting of two parts Zb and Zh. These two parts whose virtual separation is schematically represented by the dotted line S, by their shapes, their geometric dimensions and their relative positions respectively define the values of the low resonance frequency and the high resonance frequency.
  • the patch antennas such as the antenna A1 described in connection with the Fig.1 , are well adapted to mobile telephony because their far-field radiation pattern is comparable to that of conventional antennas which, it is recalled, do not use a ground plane, whereas in the near field they generate few currents due to their radiation in structures located near the mobile phone.
  • This property of patch antennas is particularly interesting because it allows to preserve a user using a telephone equipped with such an antenna electromagnetic radiation emitted by these antennas.
  • ground plane PM the dimensions of the ground plane PM are limited by the geometric dimensions of the mobile phone whose projected area is typically a few square centimeters, electromagnetic radiation occurs below the ground plane MP, which may exceed the limits. regulatory exposure of the user when such radiation is too important.
  • D.A.S. also known as S.A.R. (Specific Absorption Rate)
  • S.A.R. Specific Absorption Rate
  • D.A.S. is a function of the frequency, intensity, radiation source-organ configuration, the presence or absence of absorbing or reflecting factors, the size, shape and bio-electrical properties of the body considered.
  • the object of the present invention is therefore to solve the problem raised above so as to define a patch antenna reduced size, to obtain suitable radiation patterns while ensuring TAS values below the limit values set by applicable regulations.
  • the present invention provides an antenna comprising a ground plane and a radiating element positioned substantially parallel and at a distance from said ground plane and intended to be subjected to a radiofrequency signal at an excitation point and to a ground potential. in a mass point, characterized in that a portion of said radiating element is not vis-à-vis said ground plane.
  • This characteristic of the antenna is particularly advantageous because the fact of only partially using the ground plane makes it possible to reduce the bulk of the antenna without significantly changing the operation of the antenna.
  • said antenna being capable of radiating at a low resonance frequency, the shape and the geometric dimensions of said portion of said radiating element contribute to the definition of the value of said low resonance frequency.
  • the portion of the radiating element which is not opposite the ground plane contributes to the definition of the value of the low resonance frequency is particularly advantageous because at typically low frequency values of the order of 1GHz, the values of the specific absorption rate DAS are only slightly degraded by the partial suppression of the ground plane. Indeed, at these frequency values it is not the antenna (radiating element and ground plane) that radiates strictly speaking but mainly the metal elements that the mobile phone comprises, and mainly the printed circuit, the radiating element being sized to match the resonant frequency of these metallic elements to the desired resonant frequency.
  • said part of the radiating element consists of a first zone and at least a second zone perpendicular to said first zone.
  • the radiating element comprises elements that are parallel to the ground plane but also elements that are perpendicular thereto. If such radiating elements were implemented in antennas of the state of the art, the antenna performance would be degraded because all the parts of the radiating element are opposite the ground plane. , and the primary function of the antenna which is to resonate could even be canceled in case a part of the radiating element would touch the ground plane.
  • the essential characteristic of the antenna A2 is the positioning of a part Zb of the radiating element ER outside the surface delimited by the perimeter of the ground plane PM and projected onto a plane P parallel to the ground plane PM, c that is, the portion Zb is not opposite the ground plane PM.
  • the portion Zb of said radiating element ER contributes to the definition of the value of said low resonance frequency.
  • the Fig. 3 represents a block diagram of an A3 patch antenna according to an embodiment of the present invention.
  • the elements of the antenna A3 identical to those of the antenna A2 described in connection with the Fig. 2 bear the same references.
  • the part Zb comprises a first zone Zb 1 , a second zone Zb 2 perpendicular to the first zone Zb 1 and a third zone Zb 3 also perpendicular to the zones Zb 1 and Zb 2 .
  • the zones Zb 1 , Zb 1 and Zb 3 of the radiating element are formed, for example, by folding the portion of the radiating element ER which is not opposite the ground plane PM.
  • the perimeter of zone Zb is increased while maintaining a small footprint compared to the footprint occupied by a zone of the same surface that would not be folded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)

Claims (2)

  1. Antenne für ein Mobiltelefon, umfassend eine Masseebene (PM) und ein Strahlungselement (ER), das dazu bestimmt ist, einem Funkfrequenzsignal an einem Erregungspunkt (E) und einem Massepotential an einem Massepunkt (R) ausgesetzt zu werden, wobei diese Antenne geeignet ist, einerseits mit einer Hochfrequenz und andererseits mit einer Niederfrequenz zu strahlen, wobei das Element (ER) folgendes umfasst:
    - einen Abschnitt, der zum Teil der Masseebene (PM) gegenüberliegend verläuft, gefolgt von einem Abschnitt (Zb), der der Masseebene (PM) nicht gegenüberliegt und der die niedrige Resonanzfrequenz definiert, und
    - einen Abschnitt (Zh), der der Masseebene (PM) gegenüberliegt und der die Hochfrequenz definiert, wobei das Strahlungselement (ER) im Wesentlichen parallel zur Masseebene (PM) angeordnet ist und von dieser beabstandet ist.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass der Abschnitt, der der Masseebene (PM) nicht gegenüberliegt, aus einer ersten Zone (Zb1), einer zweiten Zone (Zb2) und einer dritten Zone (Zb3) besteht, wobei die zweite Zone (Zb2) rechtwinklig zur ersten Zone (Zb1) ist und die dritte Zone (Zb3) rechtwinklig zur ersten Zone und zur zweiten Zone ist.
EP20060291225 2005-07-28 2006-07-26 Multiband-Antenne Active EP1750325B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0508084A FR2889359B1 (fr) 2005-07-28 2005-07-28 Antenne patch multibandes

Publications (2)

Publication Number Publication Date
EP1750325A1 EP1750325A1 (de) 2007-02-07
EP1750325B1 true EP1750325B1 (de) 2009-09-09

Family

ID=36120096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060291225 Active EP1750325B1 (de) 2005-07-28 2006-07-26 Multiband-Antenne

Country Status (4)

Country Link
EP (1) EP1750325B1 (de)
DE (1) DE602006009032D1 (de)
ES (1) ES2332324T3 (de)
FR (1) FR2889359B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7969361B2 (en) 2006-03-14 2011-06-28 Broadcom Corporation Planar inverted-F antenna
EP2385578B1 (de) * 2007-03-19 2014-05-21 BlackBerry Limited Dualband-F-Slot-Patch-Antenne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI113911B (fi) * 1999-12-30 2004-06-30 Nokia Corp Menetelmä signaalin kytkemiseksi ja antennirakenne
US6326921B1 (en) * 2000-03-14 2001-12-04 Telefonaktiebolaget Lm Ericsson (Publ) Low profile built-in multi-band antenna
TWI258246B (en) * 2002-03-14 2006-07-11 Sony Ericsson Mobile Comm Ab Flat built-in radio antenna
TW543941U (en) * 2002-09-11 2003-07-21 Hon Hai Prec Ind Co Ltd Dual band antenna

Also Published As

Publication number Publication date
DE602006009032D1 (de) 2009-10-22
ES2332324T3 (es) 2010-02-02
EP1750325A1 (de) 2007-02-07
FR2889359B1 (fr) 2011-04-22
FR2889359A1 (fr) 2007-02-02

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