APPENDICES
10
APPENDIX 2: USING THE CORRECT MICROWAVE CONNECTOR
The performance you obtain from the Models 100X, 101X and
102X photodetector modules will depend largely on the instru-
ment you use to measure 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 connectors 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.
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
