Electromagnetic Fields 2 Group

Electromagnetic Fields 2 Group
People and Research topics
Electromagnetic Fields 2 Lab. website: http://labcem2.diet.uniroma1.it
Prof. Fabrizio Frezza website: http://151.100.120.244/personale/frezza
Where we are…
Engineering near the Colosseum
Department of Information Engineering,
Electronics and Telecommunications
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Fabrizio Frezza, PhD
Full Professor
People (1)
the Team
Marco Muzi
PhD Student
Chieti University
Roberto Laurita
Vincenzo Ferrara
PhD Student
Value Team Company
Associate Professor
Marco Tannino
Simone Chicarella
Technician
PhD Student
Vatican Radio
Nicola Tedeschi, PhD
Muhammad Khalid
Research Associate
PhD Student
Fabio Mangini
Carlo Santini
PhD Student
PhD Student
Endri Stoja
Fabrizio Timpani
PhD Student
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People (2)
Alessandro Palombo, PhD
the Others
Research Associate
Vincenzo Pascale
Alessandro Ciorba, PhD
PhD Student
Thales Alenia Space Company
Walter Arrighetti, PhD
Fabio Pelorossi
Technicolor Company
PhD Student
ESA-ESOC
Piero Angeletti, PhD
ESA-ESTEC
Gianluca De Renzi
PhD Student in Acoustics
Felice Maria Vanin, PhD
ESA-ESTEC
Danilo Saccoccioni
Fabrizio De Paolis, PhD
High-School Professor
ESA-ESTEC
Elia Di Salvo
Elisa Spinozzi, PhD
Thales Alenia Space Company
GEM Electronics Company
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EM-Fields Laboratory
at San Pietro in Vincoli site
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EM-Fields Laboratory
Available facilities (1)
Hardware
•Radar GPR GSSI (Geophysical Survey Systems, Inc.) SIR 2000 with an antenna Radar Team SUB-ECHO HBD 300.
•Indoor and outdoor experimental facilities for underground measurements (at Cisterna di Latina site).
•Shielded anechoic chamber Emerson&Cuming with automatic positioning system for antenna measurements.
•PNA Agilent E8363B (10 MHz-40 GHz), with time-domain option (010), calibration kit for rectangular waveguide WR-90 (8.2-12.4
GHz) Agilent X11644A, electronic calibration kit Agilent N4691B (3.5 mm, 300 kHz - 26.5 GHz).
•Vector network analyzer, model HP8530A, suitable for antennas measurements.
•Portable field meters PMM 8053A (with probes EP330, EP33M, EHP50C) and Wandel & Goltermann EMR 300 (with probe Type
18), covering the whole band 5 Hz - 3 GHz.
•Mixed analog-digital oscilloscope Tektronics MSO 2012.
Software
•Agilent 85071E, software for measuring the dielectric properties of materials.
•Comsol Multiphysics, with RF and AC/DC modules.
•Mathematica Personal Grid.
•Intel Visual Fortran with IMSL Numerical Library.
•Ansys HFSS, Designer, etc… .
•CST Studio Suite.
•FEKO.
•LabVIEW.
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EM-Fields Laboratory
Available facilities (2)
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Research topics
Scattering by spherical objects
Propagation and Scattering
in lossy media
Frequency-selective
surfaces and materials
Leaky-wave antennas
Wireless Sensor Networks
and/or Remote sensing
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Scattering by buried objects
Spherical structures
Incident and scattered fields can be represented with
the spherical-wave vector functions:
Ei =
Es =
+∞
q
∑∑
q =−∞ p =− q
+∞
q
∑∑
q =−∞ p =− q
uur (1) r
uur (1) r
a pq M pq (r ) + bpq N pq (r )
uur (3) r
uur (3) r
c pq M pq (r ) + d pq N pq (r )
M
(1)
pq
r
r
( r ) = jq ( ρ ) m pq (θ , ϕ )
M
(3)
pq
r
r
( r ) = hq(1) ( ρ ) m pq (θ , ϕ )
jq ( ρ ) r
1 ∂ ⎡⎣ jq ( ρ ) ⎤⎦ r
r
N (r ) =
p pq (θ , ϕ ) +
n pq (θ , ϕ )
ρ
ρ
∂ρ
(1)
pq
N
(3)
pq
(1)
hq(1) ( ρ ) r
1 ∂ ⎡⎣ hq ( ρ ) ⎤⎦ r
r
p pq (θ , ϕ ) +
n pq (θ , ϕ )
(r ) =
ρ
ρ
∂ρ
r
r
r
m pq (θ , ϕ ) , n pq (θ , ϕ ) , p pq (θ , ϕ ) are the Tesseral Vector Functions.
They are orthogonal
to one another!!
They are strongly connected with the Tesseral Scalar Function: Ypq (θ , ϕ ) = Pq
p
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( cos θ ) eipϕ
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Frequency-selective surfaces and materials
Structures that possess a spatial periodicity.
They can be 2D or 3D structures, with 1D, 2D, or 3D periodicity.
Surfaces
(FSS)
Bulk Substrates
(EBG & PBG)
Analysis techniques:
• Method of Moments with the Floquet analysis
• Finite-Difference Time-Domain Method
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Frequency-Selective Surfaces
FSS (1)
The EM field is decomposed in the Floquet harmonics:
r
Φ (r ) =
1
dxd y
⎛ v pq
u pq ⎞
r
ˆ
ˆ
−
y
Ψ
r
x
⎜⎜
0
0⎟
pq ( )
⎟
t
t
pq
⎝ pq
⎠
r
r
( )=
1
dxd y
⎛ u pq
v pq ⎞
r
ˆ
ˆ
x
y
r
+
Ψ
⎜⎜
0
0⎟
pq ( )
⎟
t
t
pq
⎝ pq
⎠
TE
pq
Φ
TM
pq
with:
r
i ( u x + v y +γ z )
Ψ pq ( r ) = e pq pq pq
2
2
⎧
⎪ γ pq = k0 − t pq
⎨
⎪⎩γ pq = −i t 2pq − k02
for t 2pq < k02
for t 2pq > k02
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u pq = k0 sin θ cos ϕ +
v pq = k0 sin θ sin ϕ +
2π p
dx
2π q
2π p
−
dy
d x tan α
t 2pq = u 2pq + v 2pq
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Frequency-Selective Surfaces
FSS (2)
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Frequency-Selective Surfaces
Cylindrical FSS
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Leaky-wave antennas
The electric field of a plane wave
r r ikr⋅rr
E = E0 e ,
r
α =0
In a lossless medium holds:
r r
β ⋅α = 0
with:
r r r
k = β + iα
(homogeneous waves)
(inhomogeneous waves)
In open waveguides, Leaky modes are related to radiation losses.
r
α
r
β
surface wave (proper)
r
β
r
α
leaky wave (improper)
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Leaky-wave antennas
Microwave frequencies
FDTD method applied to study Leaky-wave antennas
∞
c
a'
b
w
TE1,0
a
d
P.E.C.
y
z
x
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Leaky-wave antennas
Optical frequencies
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Wireless Sensor Networks and/or Remote Sensing
Remote sensing
for monitoring of a scenario
WSN – Smart Objects
Each node includes:
• one or more sensors
• a microcontroller
• a power source
• a communication device.
Moisture
Sensor
Temperature
Sensor
Level and pressure
detectors with
energy harvesting
Microcontroller
PIC and Transceiver
Image sensor for
target detection
GPS
navigation
data
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Input interface of
Information System GIS
Data elaboration for detecting targets
Brownfield detection example
Filtering data
Principal collaborations
•
Department of Engineering (at Roma Tre University)
•
Department of Radio Science and Engineering (at Aalto University, Finland)
•
Humanitarian Demining Laboratory (“La Sapienza” University at Cisterna site)
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