3W525 Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – Surface Mount Balun

TYPICAL PERFORMANCE: (@ 25^oC on test board)
Amplitude Balance 3W525
0.4
0
3W525
Data Sheet VER9/22/00
Unbalanced Port Return Loss 3W525
-5
0.2
-10
0.0
-15
-0.2
-20
-0.4
1800
0.0
1975
2150
Frequency [MHz]
2325
Insertion Loss 3W525
2500
-25
1800
185
1975
2150
Frequency [MHz]
2325
Phase Balance 3W525
2500
183
-0.1
181
-0.2
179
-0.3
177
-0.4
1800
1975
2150
Frequency [MHz]
2325
2500
175
1800
1975
2150
Frequency [MHz]
2325
2500
PERFORMANCE DATA:
Due to the fact the output impedances of the balun are 25Ω
to ground, a circuit board was produced to transform the
output impedances back to 50Ω in order to test the phase
and amplitude balance of the balun (see plots above). The
test fixture is shown below. This wideband transformer has a
Chebychev characteristic response.
The unbalanced port return loss plot was measured at the
input of the aforementioned test board. Unbalanced port
return loss performance can be improved as narrow band
matching is performed at the output of the balun (input of
the transistor).
The insertion loss measurement was taken by connecting
two baluns back to back and a true insertion loss
measurement was collected, the fixture is shown below.
The insertion loss
was calculated by
taking
the
transmission loss of
the board assembly
and factoring out
reflected loss and,
since there are two
baluns on the test
board, that result
Page 2 of 3
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