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281A/B Adapters Operating and Service Manual1
Overview
Description Agilent 281 adapters provide a convenient means of coupling between
waveguide and coaxial systems. Power can be transmitted in either direction,
and each adapter covers the full frequency range of its waveguide size with
an SWR of less than 1.30. The flanges are lapped to a slight, controlled
convexity to assure minimum leakage at the waveguide joint. A probe
transforms the waveguide impedance to the 50-ohm impedance of coaxial
line. Complete specifications for the adapters are given in Table1.
Examples of the waveguide flange and coaxial connectors used on these
adapters are shown in Figure 1. One type of flange and two types of coaxial
connectors are used: Type N female connectors (which are compatible with
connectors conforming to MILS-71), are available on all 281A adapters and
Amphenol precision 7-mm connectors (available on the 281B adapters). The
7-mm connector features precise alignment, a clearly defined reference
plane, and low RF leakage. In addition, any pair can be connected together
without an adapter. Option 13 adapters have stainless steel Type N female
connectors and are available on the P281B.
Figure 1 Adapters Showing Flange Types and Coaxial Connector Styles