Speaker
Professor
Ke-Li
Wu
The
Chinese
University
of
Hong
Kong
Title
Toward Full-wave Circuit Domain Modeling of Multi-conductor Circuit and Electrically Small Antenna Problems
Abstract
As
the
data
rate
increases
to
tens
of
gigabits
per
second,
the
interference
issues
risen
from
printed
circuit
board,
bonding
wires,
various
of
interconnects
and
electrically
small
antennas
becomes
more
and
more
critical
to
designers.
Accurate
modeling
of
these
electrical
characteristics
requires
a
full-wave
description
of
various
electromagnetic
(EM)
wave
phenomena,
including
mutual
couplings
as
well
as
radiation
losses.
On
the
other
hand,
the
number
of
radio
systems
in
a
wireless
handheld
device
has
been
increased
rapidly.
How
to
better
understand
the
mechanism
of
the
interferences
and
the
issues
of
radiation
efficiency
vs
antenna
geometry
from
circuit
point
of
view
become
crucial.
To
meet
the
needs,
a
full-wave
circuit
representation
of
the
problems
would
never
be
complete
without
considering
the
radiation
effect.
In
this
talk,
a
new
generalized
partial
element
equivalent
circuit
(PEEC)
formulation
will
be
introduced
first
for
a
full-wave
circuit
representation
of
a
general
multi-conductor
problem
with
not
only
inductive
and
capacitive
couplings
but
also
the
radiation
effect.
In
this
frequency-domain
formulation,
the
imaginary
part
of
the
generalized
complex
partial
inductance
takes
account
for
the
radiation
loss
by
means
of
a
frequency-dependent
resistance.
It
will
be
shown
that,
for
a
short
electric
dipole
in
free-space,
the
contribution
to
the
radiation
effect
in
the
PEEC
model
is
exactly
the
same
as
the
radiation
resistance
of
a
short
dipole
antenna
learnt
in
the
classical
antenna
theory.
Then,
the
concept
of
the
generalized
PEEC
will
be
extended
to
an
accurate
description
of
the
radiation
resistance
for
a
small
dipole
on
microstrip
substrate.
Using
the
semi-analytical
Green's
functions
for
microstrip
substrates,
the
imaginary
part
of
this
complex
inductance
can
be
shown
to
represent
a
frequency-dependent
resistance
containing
contributions
from
spatial
radiations
(spherical
and
lateral)
and
surface
waves
(cylindrical).
It
is
the
first
time
that
the
composition
of
radiation
power
from
various
waves
for
a
microstrip
structure
is
revealed.
Finally,
the
generalized
PEEC
model
is
used
as
a
starting
point
to
extract
a
Derived
Physically
Expressive
Circuit
(DPEC)
model
of
an
electrical
small
antenna,
from
which
the
radiation
resistance
and
efficiency
can
be
easily
found.
Speaker Biography
Prof.
Ke-Li
Wu
received
the
B.S.
and
M.Eng.
degrees
from
the
Nanjing
University
of
Science
and
Technology,
Nanjing,
China,
in
1982
and
1985,
respectively,
and
the
Ph.D.
degree
from
Laval
University,
Quebec,
QC,
Canada,
in
1989.
From
1989
to
1993,
he
was
with
the
Communications
Research
Laboratory,
McMaster
University,
as
a
Research
Engineer
and
a
Group
Manager.
In
March
1993,
he
joined
the
Corporate
R&D
Division,
COM
DEV
International,
where
he
was
a
Principal
Member
of
Technical
Staff.
Since
October
1999,
he
has
been
with
The
Chinese
University
of
Hong
Kong,
Hong
Kong,
where
he
is
a
Professor
and
the
Director
of
the
Radiaofrequency
Radiation
Research
Laboratory
(R3L).
He
has
authored
or
coauthored
numerous
publications
in
the
areas
of
EM
modeling
and
microwave
passive
components,
microwave
filter
and
antenna
engineering.
His
current
research
interests
include
PEEC
and
DPEC
electromagnetic
modeling
of
high
speed
circuits,
RF
and
microwave
passive
circuits
and
systems,
synthesis
theory
and
practices
of
microwave
filters,
antennas
for
wireless
terminals,
LTCC-based
multichip
modules
(MCMs),
and
RF
identification
(RFID)
technologies.
Prof.
Wu
is
a
Fellow
of
IEEE,
a
member
of
IEEE
MTT-8
subcommittee
(Filters
and
Passive
Components)
and
also
serves
as
a
TPC
member
for
many
prestigious
international
conferences
including
International
Microwave
Symposium
(IMS).
He
was
an
Associate
Editor
of
IEEE
Transactions
on
MTT
from
2006
to
2009.
He
was
the
recipient
of
the
1998
COM
DEV
Achievement
Award,
and
Asia
Pacific
Microwave
Conference
Prize
in
2008
and
2012,
respectively.