EP0520197B1 - Folienantenne - Google Patents
Folienantenne Download PDFInfo
- Publication number
- EP0520197B1 EP0520197B1 EP92108893A EP92108893A EP0520197B1 EP 0520197 B1 EP0520197 B1 EP 0520197B1 EP 92108893 A EP92108893 A EP 92108893A EP 92108893 A EP92108893 A EP 92108893A EP 0520197 B1 EP0520197 B1 EP 0520197B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- radiating elements
- foil
- inductors
- foil antenna
- 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
Links
Images
Classifications
-
- 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
-
- 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
- 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
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
Definitions
- the invention relates to a film antenna which is provided with an electrically nonconductive carrier material and radiating elements in the form of electrically conductive coatings of the carrier material and also in the form of inductors in the form of electrically conductive coatings and in which an adaptation circuit is attached to the film.
- Rod antennas are usually used as antennas for cordless telephones, the length of which corresponds to a quarter of the wavelength to be transmitted or received.
- an adaptation circuit may be required. This adaptation circuit is usually implemented with discrete components into which the antenna signal is fed, or from which the antenna is fed.
- the rod antenna which is usually attached to the outside of the cordless telephone and the structure of the adapter circuit with discrete components (capacitors, coils, resistors) can be regarded as complex in terms of production technology.
- a film antenna is known from EP 02 74 592 A1, in which both radiating elements and inductors are designed as electrically conductive coatings of a carrier material.
- the inductors and the radiating elements are arranged in series. Due to a comparatively large dimensioning of the film antenna intended for use as a room antenna, both the radiating elements and the inductors can be designed as conductor tracks with a constant width.
- the inductors run as linear conductor track sections and the radiating elements are provided with a serpentine course. Separate electrical components are used to form an adaptation circuit. The capacitors and inductors required for this are soldered to the assigned conductor track sections.
- EP 00 66 094 A1 describes a film antenna in which switching elements are provided in order to specify the mode of operation of the partial elements of the antenna which are electromagnetically coupled to one another.
- the antenna proposed in this publication should have an area of approximately one square meter and be laid, for example, under a carpet. In contrast, a reduction in the size of the antenna is important for radio telephones.
- the object of the invention is to design an antenna and an adaptation circuit in which the loss is kept as low as possible, which has a good radiation characteristic, which is easy to manufacture in terms of production technology, and which comes with dimensions which are significantly smaller than a quarter of those in question Are wavelengths.
- the inductors are arranged as a series connection between the radiating elements and are essentially designed as straight line sections, these line sections being arranged in such a way that the fields emitted by them are compensated in the far field, and the film is only conductively coated on one side is and that the matching circuit is designed as an electrically conductive coating of the carrier material.
- the film antenna according to the invention is designed as a linear antenna.
- the antenna is divided into individual radiating elements, between which inductors are arranged.
- the radiating elements are arranged so that the best possible adaptation is achieved at the desired frequency.
- Both the radiating elements and the inductances arranged between them are designed as conductive surfaces on a carrier (film).
- the adaptation circuit which is still necessary despite optimized adaptation of the antenna to the desired frequency is applied to the carrier.
- the shortened overall length is achieved in particular in that the radiating elements are arranged on the one hand in the desired direction of polarization (in the installed position of the film), but on the other hand also in the direction perpendicular thereto in the film plane. Despite this extremely space-saving The construction, in which the radiating elements are mounted on an approximately square surface, maintains the desired direction of polarization.
- the inductors arranged according to the invention between the individual radiating elements are essentially designed as straight line pieces. This should also be understood to mean, for example, elongated S-shaped designs or those with a step-like shape.
- the antenna is to be designed in such a way that line sections behave as inductors, but in the far field the radiated fields of these inductors compensate each other. The field of the radiating elements that is emitted in phase remains.
- the antenna according to the invention can be produced by coating the carrier material on both sides.
- a special embodiment, however, provides that the coating is carried out only on one side. This has particular advantages in terms of manufacturing technology.
- Individual radiating elements are advantageously arranged next to one another in one direction. This results in a first approximately linear arrangement which essentially corresponds to the polarization direction desired in the installed state of the antenna. For this first, approximately linear arrangement of radiating elements, a second, likewise approximately linear arrangement of radiating elements is advantageously provided laterally offset.
- the surfaces of the radiating elements overlap in a projection direction perpendicular to the two linear parallel arrangements.
- the radiating elements are housed in the bends of the meander. This increases the radiation resistance. This significantly reduces the influence of the losses in the carrier and the environment. In particular, however, it is important that the radiating elements are correctly electrically connected to one another. This means that the elements must be interconnected in the correct phase.
- Fig. 1 the procedure for the mechanical shortening of a half-wave dipole -A- is shown. Its radiating elements 1 are fed with radio frequency energy via the connection 4. This can be done symmetrically using suitable measures or - asymmetrically using coax cables.
- each line has an inductance.
- inductance of a line increases the smaller its diameter. Therefore, inductors in the decimeter and microwave range can also be formed by straight lines.
- Drawing -D- shows the possibility of further shortening the antenna by means of so-called “distributed inductors”. This can reduce losses. It may be necessary to eliminate the blind components resulting from the sharp shortening by using the appropriate circuitry 3 according to drawing -E-.
- FIG. 2 The observation for a quarter-wave radiator according to FIG. 2 is to be made analogously.
- the housing 5 represents the "counterweight".
- Fig. 2 -F- to -I- show the procedure for shortening the antenna.
- the radiating elements do not necessarily have to be arranged one above the other. According to the invention, they can be moved laterally. However, this is only possible to a small extent without resulting in a significant deviation from the directional diagram of the quarter-wave antenna -I- due to phase cancellation. It should also be noted that the inductance of antiphase lines, such as those used in -I-, is partially canceled out.
- the antenna must be designed so that straight line sections 2 behave as inductors, but the radiated fields of these inductors compensate each other in the far field. According to the invention, the field of the radiating elements 1 emitted in phase remains.
- FIG. 3 shows the implementation of a shortened antenna with the dimensions of approx. 25 x 25 mm. This is as a copper layer on a suitable carrier material, for. B. polyimide or epoxy glass fiber films applied.
- Four radiating elements 1 are connected by three inductors 2.
- a transformer made of line inductors 3 adapts the antenna to the 50 ohm antenna connection 4. The extremely small size compared to the wavelength of 300 mm to be received is remarkable.
- antennas are also conceivable, such as e.g. B. a greatly shortened dipole in this way.
- the antenna according to the invention can be fully integrated into the housing of the cordless telephone due to its reduced size.
- the housing forms the antenna counterweight.
- the antenna is also easy to manufacture - especially for SMD technology - allows external components to be saved and has a relatively high degree of efficiency with a relatively good directional characteristic.
- the main radiation direction is approx. 30 ° downwards with the device standing vertically and at the same time having good omnidirectional characteristics.
- the antenna according to the invention is also relatively insensitive to detuning of the antenna by handling the cordless telephone.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
- Laminated Bodies (AREA)
- Support Of Aerials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4121333A DE4121333A1 (de) | 1991-06-25 | 1991-06-25 | Folienantenne |
DE4121333 | 1991-06-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0520197A2 EP0520197A2 (de) | 1992-12-30 |
EP0520197A3 EP0520197A3 (en) | 1994-10-12 |
EP0520197B1 true EP0520197B1 (de) | 1997-05-28 |
Family
ID=6434925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92108893A Expired - Lifetime EP0520197B1 (de) | 1991-06-25 | 1992-05-27 | Folienantenne |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0520197B1 (es) |
JP (1) | JPH05191126A (es) |
AT (1) | ATE153803T1 (es) |
DE (2) | DE4121333A1 (es) |
ES (1) | ES2103012T3 (es) |
ZA (1) | ZA924346B (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7183983B2 (en) | 2005-04-26 | 2007-02-27 | Nokia Corporation | Dual-layer antenna and method |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4324480C2 (de) * | 1993-07-21 | 1997-07-17 | Hirschmann Richard Gmbh Co | Antennenanordnung |
DE19511300A1 (de) * | 1995-03-28 | 1996-10-02 | Telefunken Microelectron | Antennenstruktur |
DE19707535A1 (de) * | 1997-02-25 | 1998-08-27 | Rothe Lutz Dr Ing Habil | Folienstrahler |
US6204826B1 (en) | 1999-07-22 | 2001-03-20 | Ericsson Inc. | Flat dual frequency band antennas for wireless communicators |
JP3649099B2 (ja) * | 2000-08-04 | 2005-05-18 | 松下電器産業株式会社 | 無線通信用アンテナ |
EP1258945A3 (en) | 2001-05-16 | 2003-11-05 | The Furukawa Electric Co., Ltd. | Line-shaped antenna |
WO2004047221A1 (ja) * | 2002-11-21 | 2004-06-03 | Mitsubishi Denki Kabushiki Kaisha | 携帯電話機 |
JP2005252366A (ja) | 2004-03-01 | 2005-09-15 | Sony Corp | 逆fアンテナ |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2229865A (en) * | 1938-07-25 | 1941-01-28 | Transcontinental & Western Air | Radio antenna system |
US3210764A (en) * | 1961-12-29 | 1965-10-05 | Collins Radio Co | Dual band blade antenna with filtering and matching network on blade |
US4079268A (en) * | 1976-10-06 | 1978-03-14 | Nasa | Thin conformal antenna array for microwave power conversion |
JPS56704A (en) * | 1979-06-14 | 1981-01-07 | Matsushita Electric Ind Co Ltd | Antenna unit |
US4454514A (en) * | 1981-05-14 | 1984-06-12 | Tokyo Shibaura Denki Kabushiki Kaisha | Strip antenna with polarization control |
DE3306054A1 (de) * | 1983-02-22 | 1984-08-23 | Meier Meßtechnik, 3400 Göttingen | Folien-antenne |
KR900009111B1 (ko) * | 1986-11-07 | 1990-12-22 | 야기 안테나 가부시기가이샤 | 필름형 안테나 장치 |
US4816839A (en) * | 1987-12-18 | 1989-03-28 | Amtech Corporation | Transponder antenna |
EP0470797A3 (en) * | 1990-08-10 | 1992-05-13 | Matsushita Electric Industrial Co., Ltd | Antenna apparatus |
-
1991
- 1991-06-25 DE DE4121333A patent/DE4121333A1/de active Granted
-
1992
- 1992-05-27 EP EP92108893A patent/EP0520197B1/de not_active Expired - Lifetime
- 1992-05-27 DE DE59208531T patent/DE59208531D1/de not_active Expired - Fee Related
- 1992-05-27 ES ES92108893T patent/ES2103012T3/es not_active Expired - Lifetime
- 1992-05-27 AT AT92108893T patent/ATE153803T1/de not_active IP Right Cessation
- 1992-06-15 ZA ZA924346A patent/ZA924346B/xx unknown
- 1992-06-24 JP JP4166253A patent/JPH05191126A/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7183983B2 (en) | 2005-04-26 | 2007-02-27 | Nokia Corporation | Dual-layer antenna and method |
Also Published As
Publication number | Publication date |
---|---|
DE59208531D1 (de) | 1997-07-03 |
ZA924346B (en) | 1993-02-24 |
EP0520197A3 (en) | 1994-10-12 |
DE4121333A1 (de) | 1993-01-14 |
ATE153803T1 (de) | 1997-06-15 |
EP0520197A2 (de) | 1992-12-30 |
DE4121333C2 (es) | 1993-09-09 |
ES2103012T3 (es) | 1997-08-16 |
JPH05191126A (ja) | 1993-07-30 |
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