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The '''flap attenuator''' or resistive-card attenuator<ref>Integrated Publishing's Educational Archive [https://armymunitions.tpub.com/mm50058/mm500580191.htm armymunitions.tpub.com] </ref> is a flap-type waveguide attenuator that allows for precise and continuous attenuation of electromagnetic waves traveling through a rectangle waveguide.<ref>https://patents.google.com/patent/US2619538</ref>
It comprises a thin, disk-shaped attenuation material that extends through a longitudinal slot in the middle of the wider side of the waveguide into the inner space of the waveguide. The extent of the insertion is variable, and the attenuation can be made approximately linear with the insertion by properly shaping the resistance card.<ref name="rohini">Department of ECE, Rohini College of Engineering & Technology [https://rcet.org.in/uploads/academics/rohini_26697761285.pdf EC8701 Antenna and Microwave Engineering]</ref>
The attenuation can be typically up to 30 decibels.<ref
== References ==
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