Figure
6-37.
Measured
Eective
Directivity
Next,
a
short
circuit
termination
whose
response
is
known
to
a
very
high
degree
is used
to
establish
another
condition
(see
Figure
6-38
).
Figure
6-38.
Short
Circuit
T
ermination
The
open
circuit
gives
the third
independent condition.
In order
to accurately
model the
phase
variation
with
frequency
due to
fringing
capacitance
from
the
open
connector
,
a
specially
designed shielded open
circuit is used for this step
. (The open circuit capacitance is dierent
with each connector
type.) Now the values for E
DF
, directivity
,
E
SF
, source match,
and E
RF
,
reection frequency response
,
are computed and stored (see Figure 6-39).
Application and Operation Concepts 6-57
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