| Several transmitters and receivers for periodic
nonsinusoidal electromagnetic waves have been built during the last few
years. Various applications of such waves, primarily in radar, have been
recognized. The first practical equipment, an into-the-ground radar for
construction surveying, has become commercially available. The efficient
radiation of nonsinusoidal periodic waves has been discussed in the literature,
but very little has been published on their selective reception. This paper
describes the principle of selective receivers for periodic waves with
general time variation, in analogy to the design of the usual receivers
for waves with sinusoidal time variation. 8 pages. |