Before revision: Description The waffle-iron filter was invented by Seymour B. Cohn at Stanford Research Institute in 1957.Young, p.10 The basis for the filter is the corrugated waveguide filter.
After revision: Description The waffle-iron filter was invented by Seymour B. Cohn at Stanford Research Institute in 1957.Young, p.10 The basis for the filter is the corrugated-waveguide filter.