title: Multiaperture focusing technique.
abstract: A method of focusing electromagnetic waves by diffraction alone is proposed. An incident beam is diffracted by a series of circular apertures which have their diffracting edges falling on a surface of revolution. A geometrical consideration of the principle involved is presented, followed by a series of experimental results.
authors.forename: M
authors.initials: M
authors.lastname: De
authors.forename: J W
authors.initials: JW
authors.lastname: Lit
authors.forename: R
authors.initials: R
authors.lastname: Tremblay