NIMP| Gabriel BANCIU, Author at NIMP

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Dr. Marian Gabriel BANCIU, Scientific researcher rank I (since 2009), born in 1962, graduated the Faculty of Physics – Section Technological Physics of the University of Bucharest (1986), has a PhD degree in Electrical Engineering from University of New South Wales, Sydney, Australia (2003) and a PhD degree in Solid State Physics from University of Bucharest (2003). Work experience: Institute of Nuclear Energetic Reactors (1986-1989), National Institute of Materials Physics (NIMP) (1989 – to date), work stages at Technische Universiteit Eindhoven – Netherlands (Jan. – Sept. 1993), University of New South Wales, Sydney – Australia (1997 – 2002), Research Center for Development of Far-Infrared Region, University of Fukui – Japan (2017, 2019). Main areas of expertise: microwave materials and devices, cross-coupled filters, antenna arrays, electromagnetic design, THz – TDS. Publications 110 ISI ranked publications, cited 535 times without self citations, h-index 15, 6 invited papers to international conferences. Awards: 3 best paper awards to CAS IEEE Conference, Diploma of Excellence and Gold medal at PRO INVENT 2013 Cluj-Napoca for “Antenna with BNT resonator for 1800 MHz frequency band” Memberships IEEE Member (societies Antenna and Propagation, Microwave Theory and Techniques), European Microwave Association, Other mentions: Chairman of a TELSIKS session, referee of 5 PhD thesis (3 UNSW, 1 Univ. of Bucharest, 1 Univ. POLITEHNICA of Bucharest). Patents: 1 patent granted by OSIM (RO 131868 B1) and 3 patent requests (RO131974-A0, OSIM A00434 and OSIM A00427). Coordinated projects: 10 national projects, 5 of which as Principal Investigator. Professional profile web-links: BrainMap: https://www.brainmap.ro/marian-gabriel-banciu, ORCID ID: 0000-0003-2788-9877, ResearcherID: C-1371-2011.

Publications

1. The Influence of the Dielectric Constant in Dielectric Resonator Antennas

Authors: Moni, MV; Tuta, L; Grecu, IV; Turcan, MG; Banciu, G

Published: 2016, 2016 INTERNATIONAL CONFERENCE ON COMMUNICATIONS (COMM 2016), 114, DOI:

This paper presents a comparison between dielectric resonator antennas with different dielectric constant parameter of the resonator. The antenna is fed with microstrip line. The dielectric resonators have cylindrical geometry. In HFSS software program, the simulations are up to compare the antennas' behavior as a function of different parameters, such as: center frequency, gain, frequency bandwidth etc.

2. Studies of Aperture-Coupled Rectangular Dielectric Resonator Antenna Arrays

Authors: Turcan, MG; Moni, MV; Banciu, G

Published: 2016, 2016 INTERNATIONAL CONFERENCE ON COMMUNICATIONS (COMM 2016), 120, DOI:

In this paper, the design of aperture-couplet rectangular dielectric resonator antennas arrays is illustrated. The effect of slot feed on the dielectric resonator antenna (DRA) and the effect of the spacing between array elements is observed. This paperwork can be useful for WLAN applications with the operating frequency 5.8 GHz.

3. BST thin film capacitors integrated within a frequency tunable antenna

Authors: Rammal, M; Huitema, L; Crunteanu, A; Passerieux, D; Cros, D; Monediere, T; Madrangeas, V; Dutheil, P; Champeaux, C; Dumas-Bouchiat, F; Marchet, P; Nedelcu, L; Trupina, L; Banciu, G; Cernea, M

Published: 2016, 2016 IEEE INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY (IWAT), 47, DOI:

Ferroelectric (FE) thin film varactors can be a convenient technology for tuning miniature antennas. In this paper we present the design of a compact, agile, wire patch antenna integrating barium strontium titanate (Ba(1-x)SrxTiO3, BST) thin film interdigitated capacitors (IDC). The IDCs values were measured at different temperatures and bias voltages ranging from 0 to 120 V showing a capacitance variation of more than 40% between 11-13 GHz and up to 28% in the 2-3 GHz frequency interval. Their integration within a compact antenna design allows tuning its operating frequency on the whole WiFi band, with efficiencies higher than 70%.

4. Cylindrical Dielectric Resonator Antenna for Wireless Applications

Authors: Moni, MV; Banciu, G; Tuta, L

Published: 2015, 2015 23RD TELECOMMUNICATIONS FORUM TELFOR (TELFOR), 264, DOI:

The paper presents a CDRA (Cylindrical Dielectric Resonator Antenna) designed for wireless military and commercial applications. The antenna has been designed to radiate at 6.7 GHz, with a 160 MHz bandwidth at -10 dB. The antenna is made from a dielectric material with high quality factor. The dielectric resonator is Ba1-xPbxNd2Ti5O14 (BNT) and its relative permittivity has a value of 55.2. The feed technique used is direct coupling to micro strip-line.

5. Electro-Optic Sampling of Terahertz Pulses Using BaTiO3 in Non-Collinear Cherenkov Phase-Matching Scheme

Authors: Ozawa, S; Hori, T; Azuma, S; Funkner, S; Niehues, G; Yamamoto, K; Furuya, T; Kitahara, H; Banciu, G; Nedelcu, L; Estacio, E; Bakunov, MI; Tani, M

Published: 2015, 2015 40TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ), DOI:

In this paper we report electro-optic (EO) sampling of THz pulses using ferroelectric crystal in the non-collinear Cherenkov phase-matching scheme, where an effective velocity matching is achieved in an EO crystal with a large refractive index in the THz frequency region. We demonstrate efficient THz EO sampling using LiNbO3 and BaTiO3 crystals in the Cherenkov-phase-matching scheme. It is shown that the efficiency of EO sampling with BaTiO3 is smaller than that with LiNbO3, even though the EO coefficient (r(33)) of BaTiO3 is three times higher than that of LiNbO3. The reason of the poor performance of BaTiO3 is attributed to the strong absorption in the THz frequency region.

6. High k materials used to manufacture miniaturised dielectric antennas for military applications

Authors: Nicolaescu, I; Ioachim, A; Toacsan, I; Radu, I; Banciu, G

Published: NOV 2007, JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, 9, 3597, DOI:

The microwaves are used for both civilian and military applications for communication and detection. Due to the emerging applications and the need for more bandwidth as well as for high speed there is a strong competition for ultra high frequencies devices. As it is know the size of different kind of microwave components is in a certain relation with the wavelength divided by root square of the dielectric permittivity. So the size of microwave component can be decreased by increasing the dielectric permittivity. Dielectric materials based on TiO2 are recommended for applications in electromagnetism and optics due to their nonlinear properties, to high value of the dielectric permittivity and their temperature behavior. The paper describes very shortly the technology applied to manufacture high dielectric permittivity materials based on TiO2 and microwave devices designed with this. In addition, the experimental data measured for a dielectric antenna are presented.

7. Microstrip patch antenna with dielectric substrate

Authors: Sandu, DD; Avadanei, O; Ioachim, A; Banciu, G; Gasner, P

Published: 2003, JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, 5, 1387, DOI:

The paper refers to the study of patch antennas with a high permittivity dielectric substrate ((Zr-0.8 Sn-0.2)TiO4) obtained at National Institute of Materials Physics Bucharest. Because of the high value of the permittivity of the substrate material it was necessary to perform a comparative investigation of different prototypes and arrays. It was considered two substrate thickness h(1)=1mm and h(2)=2mm and two frequencies f(1)=2.4 GHz and f(2)=1.8 GHz. For each case we presented the radiation pattern in the two principal planes (E and H) and input impedance. Also, some radiation pattern for rectangular array with n=4, 16, 36 patches are presented. In the Conclusion section a discussion on the suitability of patch antennas with high permittivity substrate is done.

Dr. Gabriel BANCIU

Scientific Researcher I