WO2002097916A1 - Antenne a plaque - Google Patents
Antenne a plaque Download PDFInfo
- Publication number
- WO2002097916A1 WO2002097916A1 PCT/FR2002/001818 FR0201818W WO02097916A1 WO 2002097916 A1 WO2002097916 A1 WO 2002097916A1 FR 0201818 W FR0201818 W FR 0201818W WO 02097916 A1 WO02097916 A1 WO 02097916A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ground plane
- antenna
- radiant element
- means forming
- passive component
- Prior art date
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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
-
- 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
-
- 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
- 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
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
-
- 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
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
Definitions
- the present invention relates to a plate antenna and in particular but not exclusively to a plate antenna usable for portable radiotelephones.
- a plate antenna comprises on the one hand, a ground plane and on the other hand, a radiant element which, in this particular case, is a conductive plate which is electromagnetically connected to an antenna conductor called the more often "feeder".
- European patent application 1 091 444 discloses a plate type antenna which comprises a ground plane, a radiating plate parallel to the ground plane and a portion of conductive plate electrically connecting the radiating plate to the ground plane. This portion of plate constitutes a short circuit.
- the electromagnetic coupling between the antenna conductor and the radiating plate is constituted by a metal plate arranged opposite the radiating plate, this metal plate being connected to the central conductor of the antenna conductor. By electromagnetic coupling, the connection between the antenna conductor and the radiating plate is thus obtained both in transmission and in reception.
- this type of plate antenna has a drawback in the case where it is desired in particular to use it in a portable radiotelephone.
- the ground plane is generally produced on a part of the radiotelephone printed circuit while the radiating plate is fixed to the bottom of the case.
- the electrical connection between the short-circuit plate and the ground plane is uniform and has a high conductivity, which requires the use of a relatively elaborate short-circuit electrical connection system between the plate and the ground plan.
- the use of this connector therefore very significantly increases the overall cost of the antenna while as we know, the trend is to reduce the manufacturing cost of portable radiotelephones.
- An object of the present invention is to provide an antenna of the plate type which makes it possible to avoid the drawbacks mentioned above and in particular the use of a connector to produce the short circuit.
- the plate type antenna system comprises means forming a ground plane, a radiant element disposed opposite the means forming a ground plane and disposed at a predetermined distance from the plane; and it further includes:
- the antenna system is devoid of means forming a short circuit between said radiant element and said means forming a ground plane.
- the antenna system does not have a short circuit, the drawbacks mentioned above are avoided. It should be added that by properly choosing the characteristics of the passive component and the position thereof with respect to the radiant element, it is possible to obtain an adaptation of suitable impedance, for example at 50 ohms, without using specific components d impedance matching.
- the passive component consists of a conductive plane electrically connected to the feed point of the antenna and connected to the means forming a ground plane by a short circuit.
- the passive component is a conductive plane connected to the feed point of the antenna.
- An additional object of the invention is to provide an antenna of the type mentioned above which also makes it possible to adapt the width of the passband corresponding to the frequency or frequencies to which the antenna must operate and which also makes it possible to reduce the length, that is to say the total dimensions of the antenna for predetermined frequency ranges.
- the antenna system is characterized in that it further comprises adaptation means distinct from the passive component, these adaptation means being mounted between the radiant element, for example the radiating plate, and the means forming a ground plane.
- the adaptation means comprise a second conductive surface entirely opposite a second zone of the radiant element and without electrical or mechanical contact with said element radiant, said second conductive surface being electrically connected to the means forming a ground plane.
- the adaptation means comprise a variable capacitive element, one armature of which is connected to the radiant element and the other armature of which is connected to the means forming a ground plane.
- the bandwidth of the antenna thus obtained can be adjusted or adjusted.
- the adaptation means comprise, in addition to the second conductive surface, an adaptation component which is electrically mounted between the second conductive surface and the means forming a ground plane.
- the adaptation component can advantageously consist of a capacitor or possibly an inductor.
- FIG. 1A is an elevation view of a simplified embodiment of the antenna according to the invention
- Figure 1B is a top view of the antenna shown in Figure 1A
- Figure 2 is a partial perspective view of a first embodiment of the antenna of Figure 1A
- Figure 3 is a second embodiment of the antenna shown in Figure 1A
- Figure 4 shows a curve representative of the operation of the antenna of Figure 2
- Figure 5 shows in elevation a first embodiment of the antenna according to its improved mode of implementation
- FIGS. 6A and 6B respectively show in elevation and in top view a second embodiment of the antenna according to its improved mode of implementation
- FIG. 7A shows a first variant of the embodiment of FIG.
- FIGS. 1A and 1B show curves representative of the operation of the antenna of FIG. 8.
- FIGS. 1A and 1B an embodiment of the antenna will be described in a simplified manner. the invention.
- a ground plane 10 and a radiating plate 12 which in this particular case constitutes the radiant element.
- a passive component 16 constituted in this particular case by a conductive metal plate or conductive surface which will be described in more detail later is electrically connected to the feed point of the antenna, that is to say in this mode of production to the central conductor 18 of an antenna coaxial cable 20 which is itself connected to the processing circuit 22 for transmission and reception.
- additional active components such as 24 mounted between the conductive plate 16 and the ground plane.
- the additional active components 24 are used to modify the resonance conditions of the antenna.
- the passive component 16 is electromagnetically coupled with the radiating plate 12, this coupling as will be explained later may be of the capacitive type or of the magnetic type.
- the passive element constituted by the conductive plate 16 is entirely disposed opposite the radiating plate and that no mechanical element connects this conductive plate to the radiating plate. It is the air interposed between these two conductive elements which allows the electromagnetic coupling.
- FIG. 1B the antenna of FIG. 1A is partially shown in top view.
- This figure shows that it is possible to arrange the passive component 16 relative to the radiating plate 12 which preferably has the shape of a rectangle at a point A such that the adaptation of impedance for example to 50 ohms is directly obtained. This arrangement avoids the use of electrical components for impedance matching.
- FIG 2 there is shown a first particular embodiment of the antenna of Figure 1A with a capacitive coupling.
- the passive component 16 is constituted by a metallic plane, for example, of generally circular shape 30.
- the distance h between the conductive plane or plate 30 and the radiating plate 12 is equal to 2 mm while the distance H between the ground plane 10 and the radiating plate 12 is equal to 5 mm.
- the dimensions of the radiating plate 12 are 41 mm x 28 mm and the dimensions of the ground plane are 51 mm x 30 mm.
- the diameter d of the conducting plane 30 is preferably between 6 and 8 mm.
- a capacitive coupling is obtained between the plane 30 and the radiating plate 12.
- the passive component consists of a conductive plate 32 connected to the ground plane 10 by a short circuit 34.
- the plate 32 is connected to the central conductor 18 of the coaxial cable 20.
- the radiating plate and the ground plane have the same dimensions as in the previous example.
- the plane 32 is preferably rectangular in shape and has dimensions equal to 8 mm and 14 mm.
- the distances h and H are the same as in the case of FIG. 4.
- the assembly formed by the plane 32, the short circuit 34 and the corresponding portion of the ground plane functions as an exciter capable of initiating the inductive coupling between itself and the radiating plate. when it receives a signal from the antenna feed.
- Figure 4 shows that the tests made with the antenna of Figure 4 produce very good results. This curve which gives the return loss (SU) or ROS as a function of the frequency shows a very clear resonance for 1.601 GHz.
- FIG. 5 shows an embodiment of the improved embodiment of the antenna.
- the radiating plate 12 forming the radiant element
- the coaxial antenna conductor 20 with its central conductor 18 and its shield 21 electrically connected to the plane of mass 10 and the passive element 16 constituted by a conductive plate facing the area Al of the radiating plate 12.
- the adaptation means which bear the general reference 40 are constituted by a variable capacity 42, a first frame 44 of which is electrically connected to the ground plane 10 and the second frame of which 46 is electrically connected to the radiating plate. 12.
- the conductive wire 48 which connects the armature 46 to the radiating plate 12 is connected to the latter in a zone A2 distinct from the zone Al.
- variable capacitor 42 allows, by a judicious choice of its value, to adapt the bandwidth of the antenna relative to that which the antenna would have had without the means of adaptation and to provide the radiating plate 12, an antenna length greater than its physical length. This capacity can be achieved using microstrip technology.
- FIGS. 6A and 6B The first exemplary embodiment is shown in FIGS. 6A and 6B.
- the ground plane 10 we find the ground plane 10, the radiating plate 12 parallel to the ground plane 10 as well as the passive element 16 opposite the area Al of the plate 12.
- the passive element 16 is connected as this has already explained to the central conductor 18 of the coaxial conductor 20.
- the adapter element 40 is constituted by a conductive surface or plate 50 disposed entirely opposite the area A2 of the plate 12 distinct from the area A1. This plate 50 is connected by an electrical conductor 52 to the ground plane 10.
- the conductive plate 50 is neither in electrical nor mechanical contact with the radiating plate 12, only air being interposed between these two components. With this arrangement, the coupling produced between the plate 50 and the radiating plate 12 makes it possible to introduce the desired adaptation factor to modify the width of the operating frequency band of the antenna and also modify its apparent length.
- the distance h between the plate 50 and the radiating plate 12 is equal to 1 mm
- the dimensions L and 1 of the ground plane 10 are 110 mm by 85 mm
- the dimensions of the radiating plate 12 L 'and I' are 32 mm by 50 mm
- the distances dl and d2 between the center of the zones Al and A2 and the edges of the radiating plate are of the order of 12 mm
- the zones Al and A2 are arranged substantially according to the median MM 'of the radiating plate
- the diameter D of the plate 50 is 8 mm while the diameter of the plate 16 forming the passive component is between 6 and 10 mm.
- the adaptation element 40 is always constituted by a conductive plate 50 identical to that of FIG.
- this plate is connected to the ground plane 10 by means of a variable capacity 54. Furthermore, this embodiment is identical to that of FIG. 6A. It is understood that by giving the variable capacity 54 whose armatures are electrically connected to the plate 50 and to the ground plane 10 a suitable value, it is possible to adapt the width of the bandwidth to the desired value and also adapt the length " resonant "of the resonant plate 12.
- the embodiment of FIG. 7B differs from that of FIG. 7A only by replacing the capacitor 54 mounted between the ground plane and the conductive plate 50 by an inductor 54 '.
- the adaptation element 40 always includes the conductive plate 50 but the latter is electrically connected to the axial conductor 58 of a portion of coaxial cable 60.
- the shield 62 of the cable is electrically connected to the ground plane 10.
- This portion of coaxial cable constitutes a capacity.
- the length b of the coaxial cable 60 is preferably defined in such a way that it corresponds to ⁇ / 2, ⁇ being the main wavelength to which the antenna is tuned.
- the adaptation element always comprises the conductive plate 50 of electromagnetic coupling with the radiating plate 12 but it also comprises a portion 68 of coaxial cable whose coaxial conductor 70 is electrically connected to the plate 50 and whose shield 72 is connected to the ground plane 10.
- the axial conductor 70 has a second end 70B opposite its end 70A connected to the plate 50 which is electrically connected to the shield 72.
- the length b2 of the element of the coaxial cable is equal to ⁇ / 4, ⁇ being the main wavelength to which the antenna device is connected.
- the compensation element 40 consists of a conductive plate 50 in electromagnetic coupling with the radiating plate 12.
- the plate 50 is connected to a Varicap diode 80.
- the plate 50 is also connected to the ground plane 10 by a choke coil 84.
- the diode 80 is connected by the conductor 82 to an active control circuit 86 making it possible to adjust the width of the passband and the resonance frequency.
- the capacity forming the adaptation component between the second passive component and the ground plane can be achieved using microstrip technology.
- the installation of the adaptation means 40 electromagnetically coupled to the radiating plate 12 by the conductive plate 50 and electrically connected to the ground plane 10 makes it possible to modify the "natural" characteristics of the antenna to give it the desired characteristics, in particular as regards the width of the bandwidth (s). More precisely, this adaptation is obtained by appropriately choosing the position of the passive component 40 relative to the radiating plate 12.
- Figures 11 and 12 show the curves obtained with the antenna shown in Figure 8 with a capacity of the order of 1 to 10 pF and geometric characteristics described above.
- the installation of the adaptation component 40 allows: - to physically shorten the length L of the radiating plate 12;
- curve 11 corresponding to the embodiment of FIG. 8 shows that:
- the quality factor has decreased which increases the bandwidth; . the first resonance is at a frequency of 1.07 GHz.
- This frequency would correspond to a half-wavelength of 140 mm in the open air while the plate 12 has a length of 50 mm from the radiant element, hence the shortening effect;
- Figure 12 illustrates the displacement of the resonance peak, from curve 1 with a resonance frequency of 1.8 GHz to curve 2 with a resonance frequency of 1.52 GHz.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/479,169 US20040145525A1 (en) | 2001-06-01 | 2002-05-30 | Plate antenna |
EP02743337A EP1393407A1 (fr) | 2001-06-01 | 2002-05-30 | Antenne a plaque |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107227A FR2825517A1 (fr) | 2001-06-01 | 2001-06-01 | Antenne a plaque |
FR01/07227 | 2001-06-01 | ||
FR02/03447 | 2002-03-20 | ||
FR0203447A FR2825518A1 (fr) | 2001-06-01 | 2002-03-20 | Antenne a plaque |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002097916A1 true WO2002097916A1 (fr) | 2002-12-05 |
Family
ID=26213031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001818 WO2002097916A1 (fr) | 2001-06-01 | 2002-05-30 | Antenne a plaque |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1393407A1 (fr) |
FR (1) | FR2825518A1 (fr) |
WO (1) | WO2002097916A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007531370A (ja) * | 2004-03-25 | 2007-11-01 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | アンテナ構成 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4827266A (en) * | 1985-02-26 | 1989-05-02 | Mitsubishi Denki Kabushiki Kaisha | Antenna with lumped reactive matching elements between radiator and groundplate |
EP0400872A1 (fr) * | 1989-05-23 | 1990-12-05 | Harada Industry Co., Ltd. | Antenne à plaque plane pour la communication mobile |
EP0630069A1 (fr) * | 1992-12-07 | 1994-12-21 | Ntt Mobile Communications Network Inc. | Antenne |
DE19822371A1 (de) * | 1998-05-19 | 1999-11-25 | Bosch Gmbh Robert | Antennenanordnung und Funkgerät |
-
2002
- 2002-03-20 FR FR0203447A patent/FR2825518A1/fr not_active Withdrawn
- 2002-05-30 WO PCT/FR2002/001818 patent/WO2002097916A1/fr not_active Application Discontinuation
- 2002-05-30 EP EP02743337A patent/EP1393407A1/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4827266A (en) * | 1985-02-26 | 1989-05-02 | Mitsubishi Denki Kabushiki Kaisha | Antenna with lumped reactive matching elements between radiator and groundplate |
EP0400872A1 (fr) * | 1989-05-23 | 1990-12-05 | Harada Industry Co., Ltd. | Antenne à plaque plane pour la communication mobile |
EP0630069A1 (fr) * | 1992-12-07 | 1994-12-21 | Ntt Mobile Communications Network Inc. | Antenne |
DE19822371A1 (de) * | 1998-05-19 | 1999-11-25 | Bosch Gmbh Robert | Antennenanordnung und Funkgerät |
Non-Patent Citations (2)
Title |
---|
CHAN KA WAI ET AL: "Wideband circular patch antenna operated at TM01mode", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 35, no. 24, 25 November 1999 (1999-11-25), pages 2070 - 2071, XP006012999, ISSN: 0013-5194 * |
SAKAI S ET AL: "Directivity gain enhancement of small antenna by parasitic patch", ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, 1998. IEEE ATLANTA, GA, USA 21-26 JUNE 1998, NEW YORK, NY, USA,IEEE, US, 21 June 1998 (1998-06-21), pages 320 - 323, XP010291893, ISBN: 0-7803-4478-2 * |
Also Published As
Publication number | Publication date |
---|---|
FR2825518A1 (fr) | 2002-12-06 |
EP1393407A1 (fr) | 2004-03-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2825517A1 (fr) | Antenne a plaque | |
EP1407512B1 (fr) | Antenne | |
EP0649181B1 (fr) | Antenne du type pour dispositif radio portable, procédé de fabrication d'une telle antenne et dispositif radio portable comportant une telle antenne | |
EP1172885B1 (fr) | Antenne à couche conductrice et dispositif de transmission bi-bande incluant cette antenne. | |
WO2005036697A1 (fr) | Antenne interne de faible volume | |
FR2822301A1 (fr) | Antenne a bande elargie pour appareils mobiles | |
WO2002011236A1 (fr) | Antenne a surface(s) rayonnante(s) plane(s) et telephone portable comportant une telle antenne | |
EP0995234A1 (fr) | Antenne a plaque | |
EP1576696A1 (fr) | Une antenne de faible volume notamment pour radiotelephones portatifs | |
FR2800920A1 (fr) | Dispositif de transmission bi-bande et antenne pour ce dispositif | |
EP2422403B9 (fr) | Antenne multiple large bande a faible profil | |
FR2739498A1 (fr) | Assemblage d'antenne pour dispositif de communication sans fil | |
EP2466684B1 (fr) | Système d'antenne en diversité | |
FR2597266A1 (fr) | Antenne a large bande | |
WO2000014825A9 (fr) | Antenne | |
FR2730094A1 (fr) | Antenne radio | |
EP3352301A1 (fr) | Antenne pour dispositif mobile de communication | |
FR2643749A1 (fr) | Dispositif de couplage d'une ligne coaxiale a haute frequence | |
EP0015610B1 (fr) | Filtre de réflexion de fréquence image en hyperfréquence et récepteur hyperfréquence comprenant un tel filtre | |
FR2833764A1 (fr) | Dispositif pour la reception et/ou l'emission de signaux electromagnetiques polarises circulairement | |
EP1393407A1 (fr) | Antenne a plaque | |
FR2767237A1 (fr) | Circuit antenne ayant un circuit d'adaptation et procede de realisation | |
FR2967536A1 (fr) | Antenne compacte adaptable en impedance | |
FR2805085A1 (fr) | Dispositif a circuit non reciproque et dispositif de telecommunications l'utilisant | |
WO2011036418A1 (fr) | Antenne miniature |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EC EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2002743337 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10479169 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2002743337 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2002743337 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: JP |