ES2226252T3 - ANTENNA FOR RADIO OPERATED COMMUNICATIONS TERMINALS. - Google Patents

ANTENNA FOR RADIO OPERATED COMMUNICATIONS TERMINALS.

Info

Publication number
ES2226252T3
ES2226252T3 ES99117720T ES99117720T ES2226252T3 ES 2226252 T3 ES2226252 T3 ES 2226252T3 ES 99117720 T ES99117720 T ES 99117720T ES 99117720 T ES99117720 T ES 99117720T ES 2226252 T3 ES2226252 T3 ES 2226252T3
Authority
ES
Spain
Prior art keywords
antenna
layers
antenna according
individual
printed circuit
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
Application number
ES99117720T
Other languages
Spanish (es)
Inventor
Stefan Huber
Martin Dr. Weinberger
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of ES2226252T3 publication Critical patent/ES2226252T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; 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
    • H01Q1/243Supports; 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30Arrangements for providing operation on different wavebands
    • H01Q5/378Combination of fed elements with parasitic elements
    • H01Q5/385Two or more parasitic elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)
  • Waveguide Aerials (AREA)
  • Support Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The antenna has its structure formed by a conducting track of any shape applied to a circuit board. A multilayer circuit board is used with a different antenna structure or some other electrical element on each layer. The multilayer circuit board can be in the form of one or more multilayer boards, whereby the individual circuit boards each have at least three layers. The individual antenna structures can be formed into a radiator and the individual layers can adopt any position with respect to each other.

Description

Antena para terminales de comunicaciones accionados por radio.Antenna for communications terminals radio operated.

La presente invención se refiere a una antena según el preámbulo de la reivindicación 1.The present invention relates to an antenna according to the preamble of claim 1.

Con relación al desarrollo en la tecnología de radio móvil se necesitan antenas, que estén en condiciones de cubrir al mismo tiempo varias bandas de frecuencias. Además, el mercado exige terminales de radio móvil cada vez más pequeños y más baratos. Por lo tanto, se requieren antenas que tengan una necesidad de espacio reducido, se puedan diseñar sin problemas para una función en varias bandas de frecuencias o en una gama de frecuencias de banda ancha y se puedan fabricar de una manera barata y reproducible.Regarding the development in the technology of mobile radio antennas are needed, which are in a position to cover several frequency bands at the same time. In addition, the market demands increasingly smaller and more mobile radio terminals cheap. Therefore, antennas that have a need are required of reduced space, can be designed without problems for a function in several frequency bands or in a range of broadband frequencies and can be manufactured in a way Cheap and reproducible.

Los conceptos aplicados hasta ahora, como por ejemplo las antenas de alambre helicoidal o las antenas de línea de microtira, tienen todas el inconveniente de que o bien tienen una necesidad de espacio demasiado alta o no es posible sin más una sintonización en una función multibanda.The concepts applied so far, as per example helical wire antennas or line antennas microtira, they have all the disadvantage that they either have a need for space too high or not possible without more a Tuning in a multiband function.

Se conoce por el documento EP-A-0 746 054, en efecto, una disposición de antena según el preámbulo, pero esta antena no presenta una capacidad multibanda.It is known by the document EP-A-0 746 054, indeed, a antenna arrangement according to the preamble, but this antenna does not It has a multiband capability.

El cometido de la presente invención es indicar una antena del tipo mencionado al principio, que presenta una necesidad de espacio reducido, se puede diseñar para varias bandas de frecuencia y se puede fabricar barata.The purpose of the present invention is to indicate an antenna of the type mentioned at the beginning, which has a reduced space requirement, can be designed for several bands of frequency and can be manufactured cheap.

Este cometido se soluciona para la antena mencionada al principio porque las estructuras de antenas individuales están formadas para la configuración de un radiador.This task is solved for the antenna mentioned at the beginning because the antenna structures individual are formed for the configuration of a radiator.

La antena según la invención se puede fabricar de una manera sencilla y barata, requiere una necesidad de espacio reducido y se puede diseñar sin problemas para una función en varias bandas de frecuencia o en una gama de frecuencias de banda ancha.The antenna according to the invention can be manufactured from a simple and cheap way, requires a need for space reduced and can be designed without problems for a function in multiple frequency bands or in a range of band frequencies wide

En oposición a la disposición de antenas conocida a partir del documento EP-A-0 746 054, en la que se alternan en cada caso estructuras de radiación y estructuras de acopladores sobre las capas individuales y que no presenta una capacidad multibanda, cada capa individual presenta una estructura de radiación diferente, de manera que se puede fabricar una capacidad multibanda de una manera sencilla.In opposition to the arrangement of known antennas as of EP-A-0 746 054, in which radiation structures alternate in each case and coupler structures on the individual layers and not It presents a multiband capability, each individual layer presents a different radiation structure, so that you can manufacture a multiband capacity in a simple way.

Se conoce a partir del documento US-A-5 075 691 una antena multibanda constituida de forma laminar. Pero esta antena multibanda está constituida por un dispositivo de acoplamiento capacitivo que no irradia por sí mismo, que excita diferentes resonadores/antenas. En el objeto de la invención, el dispositivo de acoplamiento es un radiador, siendo realizado el acoplamiento a través de campos E y campos H. En oposición al objeto de la solicitud, todos los elementos de radiación se encuentran en un plano.It is known from the document US-A-5 075 691 a multi-band antenna  Laminated form. But this multiband antenna is constituted by a capacitive coupling device that does not radiates by itself, which excites different resonators / antennas. In The object of the invention, the coupling device is a radiator, the coupling being made through fields E and H. Fields As opposed to the object of the request, all Radiation elements are in a plane.

Otras configuraciones convenientes de la antena según la invención se deducen a partir de las reivindicaciones dependientes así como a partir de una descripción siguiente de ejemplos de realización con la ayuda del dibujo.Other convenient antenna configurations according to the invention are deduced from the claims dependents as well as from a following description of Examples of realization with the help of drawing.

En el dibujo:In the drawing:

Las figuras 1 a 8 muestran configuraciones posibles de las estructuras de antenas individuales.Figures 1 to 8 show configurations possible of the structures of individual antennas.

Las figuras 9A a 9D y la figura 10 muestran la estructura ejemplar de una antena de capas múltiples, yFigures 9A to 9D and Figure 10 show the exemplary structure of a multilayer antenna, and

Las figuras 11AA a 11D y la figura 12 muestran otra estructura ejemplar de otra antena de capas múltiples.Figures 11AA through 11D and Figure 12 show another exemplary structure of another multi-layer antenna.

Las estructuras individuales de la antena se obtienen a través de bandas de conductores configuradas de forma diferente en las distintas capas de la placa de circuitos impresos de capas múltiples. En este caso, las estructuras de las antenas adoptan las formas mostradas a modo de ejemplo en las figuras 1 a 8, pero también adoptan formas que se extienden más allá de ellas. Con preferencia, la banda de conductores tiene la forma de un meandro, de una línea de serpentina o la forma de una barra. Las bandas de conductores se pueden ramificar también, como se muestra en las figuras 5 y 6, y pueden terminar en diferentes puntos B a N1, que se encuentran en un plano. Además, es posible que en una capa estén dispuestas en cada caso adyacentes varias bandas de conductores que forman una antena.The individual antenna structures are obtained through bands of conductors configured in a way different in the different layers of the printed circuit board multi-layered In this case, the antenna structures they take the forms shown by way of example in figures 1 to 8,  but they also adopt forms that extend beyond them. With preference, the band of conductors has the shape of a meander, of a serpentine line or the shape of a bar. The bands of conductors can be branched as well, as shown in the Figures 5 and 6, and may end at different points B to N1, which They are in a plane. In addition, it is possible that in a layer they are arranged in each case adjacent several bands of conductors that They form an antenna.

En las figuras 9A a 10 se representa una antena de cuatro capas según la presente invención. En las figuras 9A a 9D se representan las estructuras individuales de las capas en las cuatro capas. La figura 10 muestra una sección transversal esquemática a través de esta antena de cuatro capas. Se puede reconocer que dos capas se encuentran dentro de la placa de circuitos impresos de varias capas y dos capas se encuentran fuera de la placa de circuitos impresos de varias capas.In figures 9A to 10 an antenna is shown four layers according to the present invention. In figures 9A to 9D the individual structures of the layers in the Four layers Figure 10 shows a cross section Schematic through this four layer antenna. It can recognize that two layers are inside the plate Multi-layered and two-layer printed circuits are outside of the multi-layer printed circuit board.

En este lugar hay que indicar todavía algunas observaciones generales sobre la antena de acuerdo con la invención. La antena multibanda de varias capas presentada aquí está constituida por una o varias placas de circuitos impresos de varias capas. El material, a partir del cual está constituida una de estas placas de circuitos impresos, se puede seleccionar libremente, pero debería ser apta para alta frecuencia. En el caso especial, puede ser también un material flexible elástico. Sobre cada capa puede estar estructurada una banda de conductores, que representa un radiador u otro elemento eléctrico discrecional.In this place we must still indicate some general observations on the antenna according to the invention. The multilayer multilayer antenna presented here is constituted by one or several printed circuit boards of several layers. The material, from which one of these is constituted printed circuit boards, can be freely selected, but It should be suitable for high frequency. In the special case, you can be also a flexible elastic material. On each layer you can be structured a band of conductors, which represents a radiator or other discretionary electrical element.

La antena está constituida por más de dos capas, es decir, por al menos tres capas. Al menos una de estas capas está dispuesta dentro del material. Las capas están con preferencia, pero no forzosamente, paralelas entre sí. Pueden adoptar cualquier posición discrecional entre sí. Las capas se pueden encontrar en cualquier posición discrecional de la placa de circuitos impresos y cada una puede poseer cualquier espesor, también diferente. Por lo tanto, son posibles también capas sobre los lados frontales y sobre los lados longitudinales. Además, son posible también capas inclinadas.The antenna consists of more than two layers, that is, for at least three layers. At least one of these layers is arranged inside the material. The layers are preferably, but not necessarily, parallel to each other. They can adopt any discretionary position with each other. The layers can be found in any discretionary position of the printed circuit board and Each one can have any thickness, also different. For the therefore, layers are also possible on the front sides and on the longitudinal sides. In addition, layers are also possible inclined

Con preferencia, solamente una banda de conductores (un radiador) posee un punto de alimentación sobre una capa. Este punto de alimentación es conectado a través de un elemento de contacto con el grupo estructural de HF del terminal de comunicaciones.Preferably, only one band of conductors (a radiator) has a power point on a cap. This power point is connected through a contact element with the HF structural group of the terminal communications

Todos los demás radiadores son excitados con preferencia a través de acoplamiento. También se pueden encontrar dos o más radiadores sobre una capa.All other radiators are excited with preference through coupling. Can also be found two or more radiators on one layer.

Pero también se pueden establecer una o varias conexiones eléctricas directas entre uno o varios radiadores sobre diferentes capas por medio de contacto pasante o contacto sobre una superficie lateral en cualquier punto discrecional. En las figuras 11A a 11D y 12 se muestra un ejemplo de este tipo con un contacto pasante. En este caso, se trata de una antena multibanda de cuatro capas, cuyas estructuras de la antena corresponden al ejemplo de realización mostrado en las figuras 9A a 9D y la figura 10. A diferencia del ejemplo de realización descrito anteriormente, en este ejemplo de realización, las capas representadas en las figuras 11A y en la figura 11C están unidas entre sí por medio de un contacto pasante, como se puede reconocer en la figura 12.But you can also set one or several direct electrical connections between one or several radiators over different layers by means of through contact or contact on a lateral surface at any discretionary point. In the figures 11A to 11D and 12 shows an example of this type with a contact intern In this case, it is a four-band multiband antenna layers, whose antenna structures correspond to the example of embodiment shown in Figures 9A to 9D and Figure 10. A difference from the embodiment described above, in this exemplary embodiment, the layers shown in the figures 11A and in Figure 11C are linked together by means of a through contact, as can be seen in Figure 12.

Claims (9)

1. Antena para terminales de comunicaciones accionados por radio, que está constituida por estructuras de antenas, que se forman en cada caso por una banda de conductores que presenta una forma discrecional y que se encuentra sobre capas diferentes de una placa de circuitos impresos de varias capas, caracterizada porque sobre cada capa de la placa de circuitos impresos de varias capas está aplicada una estructura de antena formada diferente para la configuración de una antena multibanda.1. Antenna for radio-operated communication terminals, which is constituted by antenna structures, which are formed in each case by a band of conductors that has a discretionary shape and is located on different layers of a printed circuit board of several layers, characterized in that a different formed antenna structure is applied to each layer of the multilayer printed circuit board for the configuration of a multiband antenna. 2. Antena según la reivindicación 1, caracterizada porque la placa de circuitos impresos de varias capas está constituida por una o varias placas de circuitos impresos de varias capas, presentando la placa individual de circuitos impresos al menos tres capas.2. Antenna according to claim 1, characterized in that the multi-layer printed circuit board is constituted by one or more multi-layer printed circuit boards, the individual printed circuit board having at least three layers. 3. Antena según una de las reivindicaciones 1 ó 2, caracterizado porque las capas individuales adoptan posiciones discrecionales entre sí.3. Antenna according to one of claims 1 or 2, characterized in that the individual layers adopt discretionary positions with each other. 4. Antena según una de las reivindicaciones 1 a 3, caracterizada porque las bandas de conductores individuales, que forman la estructura de antena, presentan un espesor diferente.4. Antenna according to one of claims 1 to 3, characterized in that the individual conductor bands, which form the antenna structure, have a different thickness. 5. Antena según las reivindicaciones 1 a 4, caracterizada porque sobre las capas individuales se encuentran, respectivamente una o varias bandas de conductores.5. Antenna according to claims 1 to 4, characterized in that one or more conductor bands are respectively located on the individual layers. 6. Antena según una de las reivindicaciones anteriores, caracterizada porque las bandas de conductores individuales comienzan en uno o varios puntos predeterminados y terminan en uno o varios puntos predeterminados en el mismo plano.6. Antenna according to one of the preceding claims, characterized in that the individual conductor bands start at one or more predetermined points and end at one or several predetermined points in the same plane. 7. Antena según una de las reivindicaciones anteriores, caracterizada porque una o varias de las estructuras de antena presentan un punto de alimentación, que está conectado a través de un elemento de contacto con el grupo estructural de HF del terminal de comunicaciones.Antenna according to one of the preceding claims, characterized in that one or more of the antenna structures have a power point, which is connected through a contact element with the HF structural group of the communications terminal. 8. Antena según una de las reivindicaciones anteriores, caracterizada porque están previstas una o varias conexiones eléctricas directas entre una o varias estructuras de antenas sobre diferentes capas.Antenna according to one of the preceding claims, characterized in that one or more direct electrical connections are provided between one or several antenna structures on different layers. 9. Antena según una de las reivindicaciones anteriores, caracterizada porque la antena está integrada en el grupo estructural de HF del terminal de comunicaciones.9. Antenna according to one of the preceding claims, characterized in that the antenna is integrated into the HF structural group of the communications terminal.
ES99117720T 1998-09-08 1999-09-08 ANTENNA FOR RADIO OPERATED COMMUNICATIONS TERMINALS. Expired - Lifetime ES2226252T3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19841011 1998-09-08
DE19841011 1998-09-08

Publications (1)

Publication Number Publication Date
ES2226252T3 true ES2226252T3 (en) 2005-03-16

Family

ID=7880238

Family Applications (1)

Application Number Title Priority Date Filing Date
ES99117720T Expired - Lifetime ES2226252T3 (en) 1998-09-08 1999-09-08 ANTENNA FOR RADIO OPERATED COMMUNICATIONS TERMINALS.

Country Status (6)

Country Link
EP (1) EP0986130B1 (en)
CN (1) CN1249546A (en)
AT (1) ATE272898T1 (en)
DE (1) DE59910116D1 (en)
DK (1) DK0986130T3 (en)
ES (1) ES2226252T3 (en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29925006U1 (en) 1999-09-20 2008-04-03 Fractus, S.A. Multilevel antenna
JP2003513496A (en) 1999-10-26 2003-04-08 フラクトゥス・ソシエダッド・アノニマ Interlaced multiband antenna array
DE19961488A1 (en) * 1999-12-20 2001-06-21 Siemens Ag Antenna for communications terminal has a relatively large bandwidth and can be manufactured cheaply and reproducibly
BR0017065A (en) 2000-01-19 2003-11-04 Fractus Sa Space Filling Antenna and Antenna Set
AU4121000A (en) 2000-04-19 2001-11-07 Ficosa Internacional, S.A. Multilevel advanced antenna for motor vehicles
DE60109497D1 (en) 2001-01-24 2005-04-21 Ericsson Telefon Ab L M MULTI-BAND ANTENNA FOR USE IN A PORTABLE TELECOMMUNICATIONS DEVICE
DE10108859A1 (en) * 2001-02-14 2003-05-22 Siemens Ag Antenna and method for its manufacture
EP1239539A3 (en) 2001-03-02 2003-11-05 Nokia Corporation Antenna
GB0105251D0 (en) 2001-03-02 2001-04-18 Nokia Mobile Phones Ltd Antenna
GB0122226D0 (en) 2001-09-13 2001-11-07 Koninl Philips Electronics Nv Wireless terminal
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna
WO2003034544A1 (en) 2001-10-16 2003-04-24 Fractus, S.A. Multiband antenna
FI20020396A0 (en) * 2002-03-01 2002-03-01 Heikki Olavi Ryhaenen More frequency antenna
US6870505B2 (en) * 2002-07-01 2005-03-22 Integral Technologies, Inc. Multi-segmented planar antenna with built-in ground plane
WO2005076407A2 (en) 2004-01-30 2005-08-18 Fractus S.A. Multi-band monopole antennas for mobile communications devices
BR0215993A (en) 2002-12-22 2005-11-01 Fractus Sa Multi-band monopole antenna for mobile communication device and mobile communication device
US6914567B2 (en) * 2003-02-14 2005-07-05 Centurion Wireless Technologies, Inc. Broadband combination meanderline and patch antenna
DE10311040A1 (en) * 2003-03-13 2004-10-07 Kathrein-Werke Kg antenna array
US7057560B2 (en) * 2003-05-07 2006-06-06 Agere Systems Inc. Dual-band antenna for a wireless local area network device
EP1764862A1 (en) * 2003-05-07 2007-03-21 Agere Systems, Inc. Dual-band antenna for a wireless local area network device
KR100766784B1 (en) * 2006-03-31 2007-10-12 주식회사 이엠따블유안테나 Antenna
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US7777689B2 (en) 2006-12-06 2010-08-17 Agere Systems Inc. USB device, an attached protective cover therefore including an antenna and a method of wirelessly transmitting data
GB0816755D0 (en) * 2008-09-12 2008-10-22 Univ Birmingham Multifunctional antenna

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401988A (en) * 1981-08-28 1983-08-30 The United States Of America As Represented By The Secretary Of The Navy Coupled multilayer microstrip antenna
US5075691A (en) * 1989-07-24 1991-12-24 Motorola, Inc. Multi-resonant laminar antenna
JP3185607B2 (en) * 1995-05-31 2001-07-11 株式会社村田製作所 Surface mount antenna and communication device using the same
AU705191B2 (en) * 1995-06-02 1999-05-20 Ericsson Inc. Multiple band printed monopole antenna
US5764190A (en) * 1996-07-15 1998-06-09 The Hong Kong University Of Science & Technology Capacitively loaded PIFA
US5867130A (en) * 1997-03-06 1999-02-02 Motorola, Inc. Directional center-fed wave dipole antenna

Also Published As

Publication number Publication date
CN1249546A (en) 2000-04-05
EP0986130A2 (en) 2000-03-15
ATE272898T1 (en) 2004-08-15
DE59910116D1 (en) 2004-09-09
EP0986130A3 (en) 2000-12-13
DK0986130T3 (en) 2004-09-06
EP0986130B1 (en) 2004-08-04

Similar Documents

Publication Publication Date Title
ES2226252T3 (en) ANTENNA FOR RADIO OPERATED COMMUNICATIONS TERMINALS.
ES2623252T3 (en) Phase shift device
FI106895B (en) A combined structure of a helix antenna and a dielectric disk
ES2700351T3 (en) Antenna and printed circuit board using waveguide structure
US7026999B2 (en) Pattern antenna
ES2255241T3 (en) TABLE ANTENNA FOR RADIO DEVICE.
ES2202849T3 (en) ANTENNA FOR MULTI-FREQUENCY BAND, VERY ISOLATED.
JP3864143B2 (en) Chip antenna with parasitic elements
ES2362567T3 (en) CIRCUIT PLATES.
US20110025471A1 (en) RFID transponder, in particular for assembly on metal and manufacturing method therefor
US7183976B2 (en) Compact inverted-F antenna
ES2425369T3 (en) Antenna device
PT103299A (en) MICROANTENA INTEGRATED TUNED WITH REDUCED ELECTRICAL DIMENSIONS AND ITS MANUFACTURING METHOD
EP0696079A1 (en) Antennas for surface mounting and method for adjusting frequency thereof
ES2934053T3 (en) Modular multi-stage antenna system and component for wireless communications
ES2302387T3 (en) COAXIAL CAVITY RESONATOR.
ES2298344T3 (en) MICROTINTA TRANSITION.
WO2007103965A1 (en) Energy conditioner structures
KR20020054356A (en) Flat support with at least one semiconductor chip
BR112015030497B1 (en) METHOD FOR MAKING AN ELECTRONIC ANTI-CRACK DEVICE
JP2000050534A (en) Power supply apparatus for ic card
ES2844849T3 (en) Contactless information medium
ES2954410T3 (en) Patch Antenna Power
WO2006088146A1 (en) Inductance element
EP3614407A1 (en) Electrical energy storage device and method for producing an electrical energy storage device