EP0509339B1 - Antenne avec capacité en sommet pour téléphone mobile - Google Patents
Antenne avec capacité en sommet pour téléphone mobile Download PDFInfo
- Publication number
- EP0509339B1 EP0509339B1 EP92105739A EP92105739A EP0509339B1 EP 0509339 B1 EP0509339 B1 EP 0509339B1 EP 92105739 A EP92105739 A EP 92105739A EP 92105739 A EP92105739 A EP 92105739A EP 0509339 B1 EP0509339 B1 EP 0509339B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- loading capacity
- capacity
- counterweight
- autotransformer
- 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
- 239000011888 foil Substances 0.000 claims description 5
- 239000010408 film Substances 0.000 abstract description 6
- 239000011104 metalized film Substances 0.000 abstract description 2
- 229920000134 Metallised film Polymers 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 10
- 239000004033 plastic Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 230000006978 adaptation Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001465 metallisation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/32—Vertical arrangement of element
- H01Q9/36—Vertical arrangement of element with top loading
Definitions
- the invention relates to an antenna which is provided with a head capacitance and an antenna counterweight and in which an extension coil is arranged at a base point.
- a shortened antenna is required for mobile telephones, in particular for handheld devices according to the GSM standard (Group Special Mobile), since the previously customary rod antenna, the length of which should be approximately 8 cm, is to be replaced. The latter does not have the broadband characteristics required for handheld devices in terms of adaptation and loss in terms of adaptation and loss.
- an inductance is usually used to compensate for the missing length.
- a large current flows through this extension coil, so that even a small loss resistance can reduce the antenna efficiency to an extent that is not acceptable for handheld devices.
- a shortened antenna can also be resonated with a capacitive load on the antenna tip (head capacity or roof capacity) and adapted to the feed line. This method of adjustment causes smaller losses and increases the bandwidth.
- DE 22 62 522 C2 describes an antenna for meter or decimeter waves in the manner of a folding unipole Roof capacity suggested.
- two antenna conductors approximately perpendicular to a base area are to be connected to a conductive disk acting as a roof capacitance via an inductor.
- One of the antenna conductors is connected to the base area, the other forms the antenna base point in the area of the base area.
- the inductance in this embodiment is formed in that the antenna conductors pass through the pane in an insulated manner, are guided along the side of the pane facing away from the base area and are galvanically connected to the pane at their respective ends.
- a special embodiment provides for the pane to be formed from an insulating support, in particular epoxy glass, with suitable metallizations on both sides of the pane.
- the antenna conductors standing between the pane and the base are in any case designed as wire-shaped line pieces.
- Such an antenna will occupy an approximately cylindrical space of approximately 3 cm in diameter and 3 cm in height for the planned frequency. This seems too big for handheld devices.
- the antenna is also very expensive to manufacture, since it has to be built up from individual parts, such as washers and antenna conductors, by soldering and riveting.
- the theoretical isotropic gain of the antenna should be about 5 dB, which speaks for a clear bundling, and the bandwidth should be about 7% with a standing wave ratio of less than 2.
- An antenna of the type mentioned in the introduction is known from US 48 76 709. This antenna is suitable for use in the shortwave range. From this Intended use results in the antenna having significantly smaller dimensions than the assigned wavelength.
- the antenna is realized by a metallized surface, which is excited relative to the circuit board of the device.
- the adaptation is carried out with the aid of two filters, one of which is intended for the transmitter and one for the receiver.
- By using an additional shielding plate it is possible to minimize the influence of a user's hand on the signal transmission by adapting the antenna.
- the switches required are removed from the area of the antenna.
- GB 11 53 870 describes an antenna which has a capacitively loaded radiator to reduce the required overall height.
- the antenna is operated as a parallel plate capacitor.
- the object of the present invention is to construct an antenna of the type mentioned in the introduction in such a way that that high quality signal transmission can take place with a compact and inexpensive construction.
- the antenna according to the invention is designed as a short linear antenna with head capacitance.
- An extension coil is provided at the antenna base, which, together with the head capacitance, determines the frequency range of the antenna.
- the extension coil is provided with a tap (autotransformer). The feed then takes place between the base point and the tap of the extension coil. They can be used in particular in the frequency range between 875 and 960 MHz.
- the subclaims 2 to 4 relate to special configurations of the antenna according to the invention.
- the head capacity of the antenna according to the invention is formed in particular by a flexible film.
- a metal foil can be used as the foil.
- metallized plastic films are to be used.
- the metallized film is advantageously bent to increase the head capacity.
- the bending line of the film should be approximately U-shaped.
- the antenna counterweight for example an electrically conductive base area
- the antenna counterweight itself on the flexible film, in particular made of plastic, by applying a metallization layer.
- the head capacity is then relative Large-area metallized area formed on the film.
- extension coils or economy transformers are designed to adapt as narrower conductor tracks. The conductor tracks are routed to the connection points on the antenna counterweight or the jacket of a coaxial line and to the inner conductor of the coaxial line.
- the antenna counterweight is then designed as a large-area metallized area on the flexible plastic film.
- a special embodiment provides for the antenna counterweight to be designed as a locking pot.
- the counterweight or the conductive base area has a diameter that corresponds to half the wavelength of the desired antenna center frequency. If the base surface is not made flat, but curved, the surface should end after a quarter of the wavelength, as seen from the base point of the antenna. As a result, practically no more current flows at the edge of the base area, and the base area is electrically decoupled from the supply cable and the housing.
- the locking pot is designed as part of the housing of the transmitting and receiving device.
- the antenna with head capacity according to the invention is used in particular for handheld devices for communication according to the GSM standard.
- the antenna according to FIG. 1 is arranged above an antenna counterweight (1) designed as an electrically conductive cap.
- the antenna is formed from the head capacitance (2) in the form of the bent conductive surface, the approximately S-shaped extension coil (3) and the tap (5).
- the approximately S-shaped extension coil (3) is connected on the one hand to the head capacitance (2) and on the other hand to the antenna counterweight (1) at the antenna base (4).
- the antenna base (4) is connected to the outer conductor of a coaxial cable (7) designed as a feed cable.
- the tap (5) is connected to the inner conductor of the feed cable.
- the antenna is in a preferred embodiment as a printed circuit on an as flexible film trained substrate (6) realized.
- the head capacitance (2), the extension coil (3) and the tap (5) are arranged on the substrate (6).
- the substrate (6) is folded according to FIG. 4 by a line (9) in order to increase the head capacity (2).
- the antenna with the folded substrate (6) is arranged in a plastic cap (8).
- the plastic cap (8) sits on a base (10), in which a connector (not shown in the drawing) to the coaxial cable (7) can be arranged.
- the connector is preferably inside the cap-shaped antenna counterweight (1).
- the height of the plastic cap (8) is 27 mm in a special version and the height of the antenna counterweight (1) with base (10) in a special version is 70 mm.
- the plastic cap (8) has a width of about 25 mm at its upper end in a special version.
- the antenna counterweight (1) is either designed as a metallization of the plastic shell of the radio telephone, or as a sheet metal part inserted into the plastic shell of the radio telephone.
- FIG. 5 shows a highly simplified equivalent circuit diagram of the antenna.
- the capacity C represents the head capacity (2).
- the radiation resistance is Rs and the antenna losses are summarized in Rv.
- the extension coil with tap is represented by the inductances L1 and L2 and the mutual inductance M, and on the left (indicated by the arrow) the feeding 50-ohm line is shown.
- Figure 6 shows an equivalent circuit with an ideal transformer and separate inductance.
- the transmission ratio of the transmitter is ü.
- a shortened antenna has a radiation resistance of about 10 ohms and the loss resistance is about 1 ohms.
- a transmission ratio of ü2 Z.
- Rv + Rs ü 2.1 required.
- a bandwidth of 20% results for a standing wave ratio vswr ⁇ 2.
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Transceivers (AREA)
- Telephone Set Structure (AREA)
Claims (4)
- Antenne avec une capacité (2) au sommet, munie d'un contrepoids d'antenne et dont un pôle de la base est raccordé à une bobine d'auto-induction d'allonge caractérisée par le fait que la capacité au sommet (2) est constituée par une couche métallique déposée sur un support flexible (6), le support flexible étant replié pour augmenter la capacité au sommet (2) et que la bobine d'auto-induction d'allonge (3) d'adaptation à l'impédance d'un câble coaxial (7) de raccordement, se présente sous la forme d'un autotransformateur muni d'une prise (5) et que la bobine d'auto-induction (3) est reliée d'un côté à la capacité au sommet (2) et de l'autre côté au contrepoids d'antenne (1).
- Antenne selon la revendication 1, caractérisée par le fait que le support flexible (6) accommode, outre la capacité au sommet (2), l'autotransformateur et la bobine d'auto-induction (3) constitués de couches métalliques.
- Antenne selon la revendication 1 ou 2, caractérisée par le fait que le contrepoids d'antenne est constitué d'un circuit bouchon.
- Antenne selon la revendication 3, caractérisée par le fait que le circuit bouchon est constitué par une partie du boîtier de l'appareil émetteur-récepteur.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4113277 | 1991-04-19 | ||
DE4113277A DE4113277C2 (de) | 1991-04-19 | 1991-04-19 | Antenne für ein mobiles Telefon |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0509339A1 EP0509339A1 (fr) | 1992-10-21 |
EP0509339B1 true EP0509339B1 (fr) | 1995-03-01 |
Family
ID=6430199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92105739A Expired - Lifetime EP0509339B1 (fr) | 1991-04-19 | 1992-04-03 | Antenne avec capacité en sommet pour téléphone mobile |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0509339B1 (fr) |
AT (1) | ATE119319T1 (fr) |
DE (2) | DE4113277C2 (fr) |
DK (1) | DK0509339T3 (fr) |
ES (1) | ES2072042T3 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000030209A1 (fr) * | 1998-11-13 | 2000-05-25 | Allgon Ab | Dispositif de radiocommunication portable et antenne associee a charge capacitive terminale |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100193851B1 (ko) * | 1996-11-05 | 1999-06-15 | 윤종용 | 휴대용 무선기기의 소형 안테나 |
DE19707535A1 (de) * | 1997-02-25 | 1998-08-27 | Rothe Lutz Dr Ing Habil | Folienstrahler |
GB2323476B (en) * | 1997-03-20 | 2002-01-16 | David Ganeshmoorthy | Communication antenna and equipment |
SE9804498D0 (sv) | 1998-04-02 | 1998-12-22 | Allgon Ab | Wide band antenna means incorporating a radiating structure having a band form |
JP2000077923A (ja) * | 1998-09-01 | 2000-03-14 | Nippon Antenna Co Ltd | 車載用アンテナ |
SE522492C2 (sv) * | 2000-10-27 | 2004-02-10 | Ericsson Telefon Ab L M | Antennanordning för en mobilterminal |
KR100442453B1 (ko) * | 2001-10-31 | 2004-07-30 | 김영준 | 무선통신용 앤엑스 안테나 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1153870A (en) * | 1966-06-09 | 1969-05-29 | Walter Karl Volkers | Improvements in or relating to Antennas |
BE792553A (fr) * | 1971-12-22 | 1973-06-12 | Lannionnais Electronique | Antenne radioelectrique de faibles dimensions |
GB2066580A (en) * | 1979-12-22 | 1981-07-08 | Polytechnic Marine Ltd | Antenna |
US4328501A (en) * | 1980-04-23 | 1982-05-04 | The United States Of America As Represented By The Secretary Of The Army | Small broadband antennas using lossy matching networks |
FR2498819B1 (fr) * | 1981-01-23 | 1985-05-31 | Thomson Csf | Antenne de petite dimension |
JPH01321738A (ja) * | 1988-06-24 | 1989-12-27 | Nec Corp | 携帯無線電話機の保護ケース |
US4876709A (en) * | 1988-09-08 | 1989-10-24 | Dynascan Corporation | Antenna for cordless telephone system |
-
1991
- 1991-04-19 DE DE4113277A patent/DE4113277C2/de not_active Expired - Fee Related
-
1992
- 1992-04-03 EP EP92105739A patent/EP0509339B1/fr not_active Expired - Lifetime
- 1992-04-03 ES ES92105739T patent/ES2072042T3/es not_active Expired - Lifetime
- 1992-04-03 AT AT92105739T patent/ATE119319T1/de not_active IP Right Cessation
- 1992-04-03 DK DK92105739.4T patent/DK0509339T3/da active
- 1992-04-03 DE DE59201497T patent/DE59201497D1/de not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000030209A1 (fr) * | 1998-11-13 | 2000-05-25 | Allgon Ab | Dispositif de radiocommunication portable et antenne associee a charge capacitive terminale |
Also Published As
Publication number | Publication date |
---|---|
DE59201497D1 (de) | 1995-04-06 |
ES2072042T3 (es) | 1995-07-01 |
ATE119319T1 (de) | 1995-03-15 |
DK0509339T3 (da) | 1995-07-10 |
EP0509339A1 (fr) | 1992-10-21 |
DE4113277A1 (de) | 1992-10-22 |
DE4113277C2 (de) | 1996-08-08 |
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