APPENDICES
APPENDIX 2: USING THE CORRECT MICROWAVE CONNECTOR
The performance you obtain from the Model 14XX photodetector
modules will depend largely on the instrument you use to mea-
sure its microwave output and how the connection is made to
this instrument. The male connector of the photodetector module
should be connected directly to the female connector of the
instrument. If an intervening coaxial cable is used, care must
be exercised in selecting a cable that has sufficiently low loss in
the frequency range of interest. Even if a coaxial cable is not used,
performance can be degraded if an improper adapter is chosen for
mating to the instrument. Common SMA connectors, for example,
are intended for use to only 18 GHz. Table 2 is a list of a few con-
nectors and the frequency range in which they may be used.
Table 2. Common RF connectors and the corresponding frequency
ranges in which they are useful.
11
Connector Type
Frequency Range
Compatibility
BNC
DC-2 GHz
—
SMA
DC-18 GHz
Wiltron K, 3.5 mm
Wiltron K
DC-40 GHz
SMA, 3.5 mm
2.4 mm
DC-55 GHz
Wiltron V
Wiltron V
DC-65 GHz
2.4 mm
3.5 mm
DC-34 GHz
SMA, Wiltron K
New Focus also offers the following products:
Model 1224 Female-V to Male-K
Model 1225 Male-SMA to Female-BNC
Model 1226 Female-SMA to Male-BNC
Model 1227 40-GHz Flex Cable, Female-K to Male-K
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