Microwave Engineering Laboratory (MEL)AntennaDesign & AnalysisLow & high powerpassive devicesDesign& AnalysisEMI MaterialsAbsorber fabrication & AnalysisNumerical modelingFDTD techniqueApplicationsNovel substrate materials ( synthesis & characterizations)

Antenna applications

Substrate and Ground Plane Modification for achieving broadband operation of microstrip antennas

Fig:1 SEM of LDPE/TiO2 composite substrateFig:2 Graded substrate for microstrip antennas.D. Sarmah, J.R. Deka, S. Bhattacharyya and N.S. Bhattacharyya, Study of LDPE/TiO2and PS/TiO2Composites as Potential Substrates for Microstrip Patch Antennas, Journal of Electronic Materials, vol. 39, Issue 10, pp. 2359-2365, October 2010.Fig:3 Ground plane embedded design

Fig:1 Schematic diagram the measurement set-upFig:2 Fragmented view of the test element2, 21, 12.5 mm1.2 mmIn touch superstrate technique for measurement of complex permittivityLDPE/COFe2O4 and LDPE/NiFe2O4K. Borah and N.S. Bhattacharyya, Magneto-dielectric material with nano ferrite inclusion for microstrip antennas: Dielectric characterization,IEEE Transaction on dielectrics and electrical insulation, vol. 17, Issue 6, pp. 1676-1681, December 2010.

Fig3: Schematic of designing of antenna on magnetodielectric sample Schematic of designing of antenna on magnetodielectric sampleK. Borah and N.S. Bhattacharyya, Miniaturized patch antennas on magnetodielectric substrate for X band communications,IEEE Proc. of International conferenceOn devices and communications, Ranchi,India, February 2010.

Fabricated antennas

MPA 4MPA 1MPA 2MPA 3MPA 5MPA 6Return loss analysis

Radiation patternMPA1MPA 6MPA 5MPA 4MPA 3MPA 2

Planar passive devices

Magnetically tunable microstrip notch filters on NiFe2O4 LDPE substrate

Grounded CPW configuration for determination of complex permittivity and complex permeability of magneto- dielectric composite material using scalar S- parameters

Tunable microstrip notch filter on Co0.4Ni0.6Fe2O4 LDPE substrate

Return Loss Measurement of RRSR on Co0.4Ni0.6Fe2O4 LDPE Substrate Under External DC Magnetic Field at X-band

Numerical modeling

FDTD technique

Fig- spatial variation of the electric field and magnetic field along the direction of propagation for T=80 and T=100. Developed FDTD code for free space and dielectric medium interface

Laboratory facilities

High power (200 kW) microwave spin-wave instability measurement setup

Indigenous PC- interface automated antenna radiation pattern measurement setup

Indigenous PC- interface automated X-band microwave bench

Vector Network Analyzer

Request

For a software for EMI design analysis (EMPro / XFDTD/ HFSS).Approximate price: 10 to 15 lacs

Propagating of a soft source