Multifunctional dielectric materials produced by spark plasma sintering for passive microwave devices


Project Director: Dr. Liviu NEDELCU

Project Director: Liviu NEDELCU

Project Type: National

Project Program: PED

Funded by: Executive Unit for Financing Higher Education, Research, Development and Innovation (UEFISCDI)

Contractor: National Institute of Materials Physics

Project Status: In progress

Start Date: 23 October, 2020

End Date: 21 October, 2022

Project summary

The main objective of the project is to exploit the versatility of the spark plasma sintering (SPS) technique in order to prepare Zr1-xSnxTiO4 (ZST) solid solutions with various shapes whose multifunctional properties set the ground for development of the new generation of high performance microwave devices. Even though has several advantages, SPS can produce a lot of oxygen vacancies in oxide materials and such defects increase the dielectric loss. In order to overcome this drawback, as-sintered sample will be ex-situ annealed in air or oxygen atmosphere. Apart of usual structural and morphological characterizations, the extrinsic contribution to the losses will be investigated by microwave spectroscopy and terahertz time-domain spectroscopy. Through the analysis of the “synthesis - microstructure – properties” cycle, the technology suitable for fabrication of “zero-porosity” ZST ceramics with low dielectric loss in microwave domain will be developed. The targeted results would allow achieving of materials with multifunctional properties with a breakthrough potential in terms of efficiency and cost-effectiveness of the passive microwave devices.

Dr. Liviu Nedelcu

Dr. Petre Badica

Dr. Marian Gabriel Banciu

Dr. Monica Enculescu

Dr. Iuliana Pasuk

Dr. Lucian Trupina

Dr. Viorica Stancu

Dr. Cristina Bartha

Dr. Cristina Besleaga

Dr. Mihail Burdusel

Dr. Mihai Grigoroscuta

Eng. Dragos Cesar Geamnasu

Teh. Dalma Gaspar

Stage 1 (2020)

  • Single-phase ZST powders obtained by solid-state reaction.

 

Stage 2 (2021)

  • ZST dielectric resonators with cylindrical shapes fabricated by SPS.
  • ZST dielectric resonators with polyhedral  shapes fabricated by SPS.
  • Electromagnetic models of various shapes dielectric antennas based on various shape  ZST resonators.

 

Stage 3 (2022)

  • ZST dielectric resonators with polyhedral  shapes fabricated by SPS.
  • Electromagnetic models of compact antennas.
  • Experimental model of compact antenna for 5G mid-band spectrum.

ISI Journals

1. L. Nedelcu, M. G. Banciu, C. D. Geambasu, M. Burdusel, M. A. Grigoroscuta, M. Enculescu, P. Badica, Microwave and terahertz properties of spark-plasma-sintered Zr0.8Sn0.2TiO4 ceramics, Materials, vol. 15, 1258, 2022.

2. O. G. Avadanei, M.G. Banciu , L. Nedelcu, M. Avadanei, Asymmetric microstrip line feed multimode cylindrical dielectric resonator antenna, Journal of Optoelectronics and Advanced Materials, vol. 24 (2022), pp. 347-354.

 

International conferences

1. L. Nedelcu, C. D. Geambasu, M. G. Banciu, M. Burdusel, M. A. Grigoroscuta, P. Badica, Extrinsic and intrinsic losses in Zr0.8Sn0.2TiO4 ceramics investigated by microwave and terahertz  spectroscopy, E-MRS SPRING MEETING 2021, virtual conference, May 31- June 3, 2021.

2. M. G Banciu, C. D. Geambasu, L. Nedelcu, Modes investigation of prismatic dielectric elements for microwave antennas, 44th International Semiconductor Conference (CAS 2021), virtual event, 6-8 October, 2021.

3. L. Nedelcu, M. G. Banciu, C. D. Geambasu, M. Burdusel, M. A. Grigoroscuta, M. Enculescu, P. Badica, Intrinsic losses in microwave dielectrics investigated by THz-TDS: A comparison between conventional and spark plasma sintered Zr0.8Sn0.2TiO4 ceramics, Proceedings of the 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 28 August 2022 - 02 September 2022, Delft, Netherlands, pp. 1-2. DOI: https://doi.org/10.1109/IRMMW-THz50927.2022.9895934.

 

Patent request

1. L. Nedelcu, M. G. Banciu, C. D. Geambasu, M. Burdusel, M. A. Grigoroscuta, P. Badica; Antenna for 5G N79 frequency band with triangular dielectric resonator fabricated by spark plasma sintering; patent request no. A/00663/2022

Dr. Liviu Nedelcu

Scientific researcher rank II

Laboratory of Complex Heterostructures and Multifunctional Materials

Phone: +40-(0)21-2418 123

nedelcu@infim.ro

 

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