Elliptika

Gouesnou, France

Elliptika

Gouesnou, France
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Aouidad H.,French National Center for Scientific Research | Favennec J.-F.,French National Center for Scientific Research | Rius E.,French National Center for Scientific Research | Manchec A.,Elliptika | Clavet Y.,Elliptika
European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC | Year: 2015

This paper presents a method of electric tunability using varactor diodes installed on SIR coaxial resonators and associated filters. Using varactor diodes connected in parallel, in combination with the SIR coaxial resonator, makes it possible, by increasing the number of varactor diodes, to expand the tuning range and maintain the unloaded quality factor of the resonator. A second order filter, tunable in center frequency, was built with these resonators, providing a very large tuning range. © 2015 EuMA.


Patent
French National Center for Scientific Research and Elliptika | Date: 2015-06-10

A radio-frequency resonator comprising a plurality of coaxial line sections (CLS_(1) ...CLS_(n)) connected in cascade, each of said coaxial line sections comprising an inner conductor (C_(i)) surrounded by an outer conductor (C_(i+1)) of tubular shape, wherein said coaxial line sections are nested within each other, the outer conductor of each said coaxial line section, except an outermost one (C_(n+1)), serving as the inner conductor of another one of said coaxial line sections, the resonator being characterized in that each conductor of each coaxial line section, except the outer conductor of the outermost coaxial line section, has an open-circuit end and an opposite end which is short-circuited to said outer conductor of said outermost coaxial line section, and in that said conductors of said coaxial line sections - except the outer conductor of said outermost coaxial line section - are arranged head-to-tail, their open-circuit and short-circuited ends being alternatively situated on opposite sides of the resonator. Such a resonator achieves a better tradeoff between the conflicting requirements of reduced size and good electrical performances. A radio-frequency filter comprising a plurality of such radio-frequency resonators mounted adjacent to each other and coupled by openings in the outer conductors of their respective outermost coaxial lines, forming coupling irises.


Aouidad H.,University of Western Brittany | Rius E.,University of Brest | Favennec J.-F.,University of Brest | Manchec A.,Elliptika | Clavet Y.,Elliptika
International Journal of Microwave and Wireless Technologies | Year: 2015

This paper describes a concept of stepped impedance resonators (SIR) built from two coaxial structures fitted inside one another. The resonator is built out of a succession of two coaxial sections in cascade, where the ground conductor of the first one is the central core of the next, or vice-versa. An advantageous property of SIR is that they allow a substantial reduction in size, while keeping away the first harmonic and without strongly degrading the quality factor. After describing the theoretical behavior of the resonator, we will then present the specific properties of this approach in second order filter, conceived, and realized in the UHF band. With this example, we will also address flexibility and tunability aspects, which are the other potentially useful properties of the structure. Measurements and simulations are presented and discussed. The architecture resembles a set of two Russian dolls that fit inside one another. Copyright © Cambridge University Press and the European Microwave Association 2015


Manchec A.,Elliptika | Manchec A.,University of Western Brittany | Clavet Y.,Elliptika | Clavet Y.,University of Western Brittany | And 12 more authors.
Microwave Journal | Year: 2013

This article describes an innovative education kit known as Eductika. It is dedicated to students and teachers in electronics. The main concept is the assembly of basic puzzle elements to create microwave passive components such as filters, couplers and antennas. The design of an ultrawideband filter using this kit is provided as an example. All steps from theory through measurement are illustrated. Good agreement is shown between the simulation and the measurement.


Aouidad H.,University of Western Brittany | Favennec J.-F.,University of Western Brittany | Rius E.,University of Western Brittany | Manchec A.,Elliptika | Clavet Y.,Elliptika
European Microwave Week 2015: | Year: 2015

This paper presents a method of electric tunability using varactor diodes installed on SIR coaxial resonators and associated filters. Using varactor diodes connected in parallel, in combination with the SIR coaxial resonator, makes it possible, by increasing the number of varactor diodes, to expand the tuning range and maintain the unloaded quality factor of the resonator. A second order filter, tunable in center frequency, was built with these resonators, providing a very large tuning range. © 2015 EuMA.


Aouidad H.,Elliptika | Favennec J.-F.,Laboratoire Des Science Et Techniques Of Linformation Of La Communication Et Of La Connaissance | Rius E.,Laboratoire Des Science Et Techniques Of Linformation Of La Communication Et Of La Connaissance | Clavet Y.,Elliptika | Manchec A.,Elliptika
IEEE Transactions on Components, Packaging and Manufacturing Technology | Year: 2015

Coaxial dielectric resonators made from materials with high relative permittivity, including ceramics, have good temperature stability and quality factors of the order of 1000 in the UHF band. At these frequencies, large wavelengths are disadvantageous from the point of view of size, but high dielectric constants, up to 90, can be used to minimize them. However, coupling the input/output of filters, i.e., their excitation, remains a critical issue, especially when wide passbands are required. The objective of this paper is to present a novel technique to make this coupling, to solve problems that arise when using classic techniques. The approach consists of nesting a conducting rod in each central core of the input/output resonators, which creates another coaxial TEM mode that will couple with the fundamental TEM mode of the input/output resonator. The length and/or position of the rod provide the opportunity to easily and accurately tune input/output couplings over a wide dynamic range. In this paper, we show the effectiveness of the solution, presenting the experimental results of sixth-order filters centered at 435 MHz, one made on the basis of a standard input/output coupling and the other on the basis of the new solution proposed here. © 2011-2012 IEEE.


According to the invention, the following are provided:

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