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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. Source


Diedhiou D.L.,CNRS Institute of Electronics and Telecommunications, Rennes | Rius E.,Laboratoire Des Science Et Techniques Of Linformation Of La Communication Et Of La Connaissance | Favennec J.-F.,Laboratoire Des Science Et Techniques Of Linformation Of La Communication Et Of La Connaissance | El Mostrah A.,CNRS Institute of Electronics and Telecommunications, Rennes
IEEE Microwave and Wireless Components Letters | Year: 2015

This letter presents the design of a Ku-band cross-coupled 6th order inductive post SIW ceramic filter, implemented with a novel cross-coupling between cavities 1 and 6, aiming to introduce transmission zeros to improve the out-band rejections. The originality of this letter is to consider an electrical cross-coupling embedded in the substrate via a parallel-plate waveguide. This kind of solution allows good isolation of the access cavities. The response of the filter is also highly resistant to technological dispersions. The performances of the proposed solution are compared to those of a reference filter, based on a planar electric cross-coupling, through an additional thick-film microstrip line. The proposed solution is compared with relevant examples from the literature. © 2014 IEEE. Source

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