Tunable dielectric composite and method for the production thereof

  1. Home
  2. Interface

Patent Details

Publication Number
WO2011083348
PT104881
Priority Date
2009-12-11
Publication Date
2011-07-14
International Patent Classification
C04B35/468
H01G4/12
H01P1/18
H01P7/04
H01Q1/38
H01Q13/28

Figures

figura
By the incorporation of highly tunable ferroelectric BST in a non tunable BNT matrix, the tunability of the composite was enhanced, while retaining the low losses of BNT to fit the requirements of tunable dielectrics for agile systems, such as band pass filters.

Abstract

The present invention relates to composite dielectric materials with low dielectric losses and high tunability of the relative dielectric permittivity, in the form of thick films to be used and integrated in circuits, as passive components of tunable devices, for application at radio and microwave frequencies, and methods for the production thereof, specifically with the combination of the electrophoretic deposition method with the sol gel method for manufacturing said thick composite films, composed of a dielectric phase with low dielectric losses (high Q), such as the rare earth barium titanates BaO-Re2O3-TiO2 (Re = Nd, Sm, La, in particular), the neodymium titanate (BaNd2Ti5O14, BNT), and of a dielectric phase with a tunable dielectric permittivity that is tunable by the electric field, as components of the solid solution between barium titanate and strontium titanate BaTiO3 - SrTiO3, such as (Ba0.5 Sr0.5) TiO3 (BST), in particular.

Innovative aspects & main advantages

The present invention describes a new tunable dielectric composite that comprehends a tunable dielectric material and a non tunable dielectric material composed of one or more of the: barium titanate rare earth bronzoids family materials, BaO-Re2O3-TiO2, being Re = Nd, Sm, La, among others; MgTiO3; Ba2Ti9O20; Zr0.8TiSn0.2O4; Ba(Mg1/3Ta2/3)O3; or similar; or their compositions and of a dielectric with a tunable dielectric permittivity with the electric field, as compounds of the solid solution between barium titanate and strontium titanate BaTiO3 – SrTiO3, as (Ba0.5 Sr0.5)TiO3 (BST), namely.
The present invention is useful to make compatible, in the same film, low dielectric losses with a high tunability of the dielectric permittivity, which properties do not exist in a unique material and fundamental for devices operating at high frequencies; the miniaturization of high frequency devices; and the possibility of application to many other electroceramic systems, anticipating the broadening of the existent applications and the fabrication of new electronic devices for high frequency applications.

Applications

The present invention seeks to produce thick films of dielectric materials of optimized properties (low dielectric loss and high Q) for use in, for example, varactors, tunable filters, phase shifters, co-planar and linear phase array antennas. The present invention can also produce multilayer thick films in order to enable the manufacture of vertical tunable capacitors of high capacity and low costs. These capacitors, as well as planar capacitors form the basis of tunable filters and resonators of high power.

Inventors

Dielétrico compósito sintonizável e processo de fabrico

Our Inventors

foto Aiying Wu

Aiying Wu

Researcher
foto Paula Maria Lousada Silveirinha Vilarinho

Paula Maria Lousada Silveirinha Vilarinho

Vice Director

Applicant

Universidade de Aveiro

Groups Involved

G2 - Photonic, Electronic and Magnetic Materials

Share this Patent

Related Patents

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".


Privacy and Cookie Policy

Personal data

CICECO-Aveiro Institute of Materials respects your privacy, ensuring confidentiality of personal data you share with the institution through this way, not collecting any personal information about you without your consent, under the terms required by General Data Protection Regulations (RGPD).

The data collected in forms are intended exclusively for processing user requests and will not be used for any other purpose, always safeguarding their confidentiality, under the terms of the protection conferred by the aforementioned regulation.

The collection and processing of data is the responsibility of CICECO and its storage is properly protected, only authorized CICECO employees can access the information within the scope of their functions, always being clear in the respective collection forms the purposes for which they are intended. The remaining issues to be considered in this matter will be handled by the University of Aveiro in accordance with the regime established by the GDPR.

Cookies policy

Cookies are small files with alphanumeric information that are stored on your computer's hard drive by your browser and are intended to improve the user experience and enhance website navigation.

Collection and use of technical information

The cookies used on CICECO are anonymous, and no information about our users that allows their personal identification is stored in them.

The technical information recorded consists of:

  • iP (Internet Protocol) address of the visitor;
  • the type of internet browser used by the website visitor and the respective operating system used;
  • the date and time of the consultation;
  • the pages visited on the site and the documents downloaded
  • The technical information collected is used for statistical purposes only.

Cookies used

Session cookies

These cookies are used to record user preferences, such as the language in which websites are displayed or to maintain authenticated user sessions, and are automatically deleted when the browser is closed.

Persistent cookies

These cookies store information that is needed between sessions. For example, a persistent cookie is set to record that you have been made aware of the cookie policy so that the message regarding this policy is not shown again the next time you visit the website. This cookie remains on the computer until it reaches its expiry date or is deleted by the user.

Data protection

The present privacy policy covers the Information System of the University of Aveiro (SIUA), governed by the General Data Protection Regulations (RGPD) Regulation (EU) No. 2016/679, of April 27th, 2016.

Data Protection Officer

The University of Aveiro has a Data Protection Officer (DPO), who ensures compliance of the processing of personal data with the legislation in force, and is available through the following email address epd@ua.pt.

Close