Phd Offer In Electronics : “Multi-Band Microwave Filters: Syntheses And Application In 3D...

Universities and Institutes of France

France

October 1, 2022

Description

  • Organisation/Company: INSA Rennes
  • Research Field: Engineering Other
  • Researcher Profile: First Stage Researcher (R1)
  • Application Deadline: 01/10/2022 00:00 - Europe/Brussels
  • Location: France › Rennes
  • Type Of Contract: Temporary
  • Job Status: Full-time
  • Hours Per Week: 35
  • Offer Starting Date: 01/11/2022
  • Is The Job Related To Staff Position Within A Research Infrastructure?: Yes
  • PhD Offer in Electronics

    “Multi-band microwave filters: syntheses and application in 3D technologies”

    Numerous works focus on multi-band microwave filters since the beginning of the 2000s, in particular on two- or three-band cases 1-3. They allow to minimize the number of components in multi-standard systems and consequently the size and cost of radio-frequency front-ends. However, only few works present structures beyond 2 or 3 bands and they generally impose the topology of filters thus limiting the achievable performance 4-6, some strong constraints 7 or mathematical expressions limited to 4 or 5 bands 8.

    Recently, as part of the thesis of Y. WU at IETR, we proposed new general syntheses of multi-band filters applicable to any number of bands 9-11. Several multiband filters, up to 6-band, were designed, fabricated and measured as proof-of-concept. Nevertheless, all filters were fabricated in microstrip planar technology while it is theoretically possible to do so in any technology. A first objective of this PhD project will be to demonstrate this general implementation aspect by designing some multiband filters in 3D or hybrid technologies (SIW 12 or SISL 13). Such technologies would allow to have better performance especially in terms of losses and rejection. In order to simplify this new implementation, a first step will consist in writing the inter-resonator relations in a coupling matrix form.

    The second objective will be to introduce additional transmission zeros in the multiband filter response. Indeed, a limitation of the syntheses proposed by Y. WU is the lack of transmission zero before the lower band and above the upper one. To add some, we plan to use couplings between non-adjacent resonators. The use of these so-called cross-couplings should also make it possible to obtain constant group time-delay in each band, minimizing the distortions introduced by the component on the signals. To do that, we will again use the techniques based on the coupling matrices but also the so-called nodal matrices which make it possible to take into account the frequency dependence of the coupling coefficients 14. This will make possible to propose general methods to synthesize more and more efficient multi-band filters. Here again, several demonstrators could be designed and fabricated in different technologies (planar, 3D, SIW or SISL).

    The fabrication of the different developed multiband filters will be done in collaboration with the Elliptika company (Brest, France), especially with their 3D-printing means, or directly using the facilities available in Rennes within the IETR or through the NanoRennes platform. The use of SISL technology could be done in the context of a collaboration with the team of Pr. Ma in Tianjin University (China).

    Depending on the available time, new avenues of research may be explored. They will concern especially the reconfiguration of these multi-band filters.

    Description of work:

    The PhD thesis will take place mainly at IETR (https: // www. ietr.fr/en) in Rennes, France, in collaboration with the Lab-STICC (https: // labsticc.fr/en) in Brest, France. It will follow this provisional schedule:

  • First year: the doctoral student will begin by familiarizing her/himself with the different techniques for producing multi-band microwave filters through a state of the art. She/he will be trained in single- and multi- band filter synthesis techniques in their 2 main forms: the use of the slope parameter on the one hand and of the coupling matrices on the other hand. She/he will also build skills in the different technological solutions investigated in this project (3D, SIW, SISL, planar). The main tasks of this first year will be to translate the syntheses developed by Y. Wu in a coupling matrix form and to apply them to the design, the fabrication and the characterization of several demonstrators (5 or 6-band bandpass filters) in 3D and SIW technologies.
  • Second year: the first goal will be to finalize the first experimental validations. The second task will consist in studying and implementing the couplings between non-adjacent resonators to add transmission zeros in the response of multi-band. New demonstrators will then be developed in planar or 3D technologies. A study of the interest of the SISL technology for multiband filters will also be done.
  • Third year: it will be devoted to the final experimental validations of all the work. Depending to time available, the reconfiguration of multi- band filter in 3D or SIW technology could be studied. At the same time, the doctoral student will write her / his PhD thesis and prepare her / his defense.
  • Throughout the thesis and as soon as it is relevant, she/he will communicate on her/his work through articles in international journals or conferences.

    Candidate profile:

    The PhD candidate should hold a Master degree M2R in electrical engineering (microwaves) or an equivalent title recognized by the doctoral school MathStic (https: // ed-mathstic.u-bretagneloire.fr). In particular, she/he should master electromagnetic theory, microwave theory and circuit analysis and design. A particular ease in mathematics is also required. A good level of spoken and written English is required. The candidate must also demonstrate autonomy, dynamism and creativity.

    How to apply:

    Motivated candidate should send by email 1) a detailed CV, 2) a motivation letter, 3) at least a recommendation letter, and 4) marks obtained over the last 3 years, to Erwan FOURN (erwan.fourn@insa-rennes.fr) before September 30, 2022. The thesis will start on November or December at the latest.

    References:

    1 C. Quendo, E. Rius, C. Person, “An original topology of dual-band filter with transmission zeros”, IEEE MTT-S International Microwave Symposium Digest, Jun. 2003.

    2 G.Macchiarella, S.Tamiazzo,“Design techniques for dual passband filters,” IEEE Transaction on Microwave Theory and Techniques, vol. 53, no. 11, pp. 3265-3271, Nov. 2005.

    3 V. Crnojevic-Bengin, “Advances in multi-band microstrip filters”, EuMA High Frequency Technologies Series. Cambridge University Press, Juin 2015.

    4 H. W. Wu and R. Yang, “A new quad-band band-pass filter using asymmetric stepped impedance resonators,” IEEE Microwave and Wireless Components Letters, vol. 21, no. 4, pp. 203–205, Apr. 2011.

    5 X. Bi, Q. Ma, Q. Xu, L. Gui and Q. Li, “A high-selectivity quad-band bandpass filter utilizing asymmetrical interdigital coupled lines and circular spiral lines”, IEEE Microwave and Wireless Components Letters, vol. 28, n°9, Sept. 2018.

    6 F. Zhang, X. Wang, X.-L. Huang and J.-G. Liang, “Synthesis of centrosymmetric-coupled stub structure bandpass filter: dual-band, triple- band, quad-band and quint-band”, IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS- AMP), Dec. 2021.

    7 A. Garcia-Lamperez and M. Salazar-Palma, “Single-band to multi-band frequency transformation for multi-band filters,” IEEE Transaction on Microwave Theory and Techniques, vol. 59, no. 12, pp. 3048–3058, Dec. 2011.

    8 R. Gómez-García, L. Yang, J.-M. Muñoz-Ferreras, D. Psychogiou, “Single/multi-band coupled-multi-line filtering section and its application to RF diplexers, bandpass-.bandstop filters and filtering couplers.

    9 Y. Wu, E. Fourn, P. Besnier, and C. Quendo, “Direct synthesis of a quad- band band-pass filter by frequency transformation methods,” in Proceedings of the 49th European Microwave Conference (EuMC), Paris, France, Oct. 2019.

    10 Y. Wu, E. Fourn, P. Besnier, and C. Quendo, “Direct Synthesis of Multiband Bandpass Filters With Generalized Frequency Transformation Methods”, IEEE Transaction On Microwave Theory and Techniques, vol. 69, n°8, pp. 3820-3831, Aug. 2021.

    11 Y. Wu, E. Fourn, and P. Besnier, “Design of multiband band-pass filters based on novel associated band-stop resonators," Progress In Electromagnetics Research Letters, vol. 103, pp. 65-72, 2022.

    12 D. Deslandes and K. Wu, “Integrated microstrip and rectangular waveguide in planar form”, IEEE Microwave Wireless Component Letters, vol. 11, n°2, pp 68-70, Feb. 2001.

    13 Z. Ma, et al., “Quasi-Lumped-Element Filter Based on Substrate- Integrated Suspended Line Technology”, IEEE Transaction on Microwave Theory and Techniques, vol. 65, no. 12, pp. 5154–5161, Dec. 2017.

    14 F. Ralarioely, “Etude et réalisation de filtres planaires DBR à réponse plate pour applications spatiales“, Thèse de Doctorat en Électronique de l'Université de Bretagne Occidentale, Dec. 2010.

    Offer Requirements Skills/Qualifications

    The PhD candidate should hold a Master degree M2R in electrical engineering (microwaves) or an equivalent title recognized by the doctoral school MathStic (https: // ed-mathstic.u-bretagneloire.fr). In particular, she/he should master electromagnetic theory, microwave theory and circuit analysis and design. A particular ease in mathematics is also required. A good level of spoken and written English is required. The candidate must also demonstrate autonomy, dynamism and creativity.

    Contact Information
  • Organisation/Company: INSA Rennes
  • Organisation Type: Higher Education Institute
  • Website: https: // www. insa-rennes.fr
  • Country: France
  • City: Rennes
  • State/Province: Brittany
  • Postal Code: 35708
  • Street: 20 avenue des buttes de Coësmes