Abstract: This disclosure provides a dielectric antenna including an antenna element for radiating electromagnetic waves at a predetermined frequency in a predetermined direction, and a dielectric member arranged in the radiating direction of the electromagnetic waves radiated from the antenna element. The dielectric member includes two or more dielectric layer portions each extending in a direction perpendicular to the radiating direction of the electromagnetic waves. The two or more dielectric layer portions are arranged at predetermined intervals in the radiating direction of the electromagnetic waves.

Abstract: This invention relates to a non-oriented electromagnetic steel sheet with low leakage flux for a compact transformer and a method for making the same. After stress relief annealing, the magnetic permeability .mu..sub.C of the sheet in the direction transverse to the sheet rolling direction is.mu..sub.C .gtoreq.about 2.5.times.10.sup.-3 (H/m)and magnetic permeability .mu..sub.D of the sheet in the direction 45.degree. to the sheet rolling direction is.mu..sub.D .gtoreq.about 1.5.times.10.sup.-3 (H/m).

Abstract: A fish school detecting method or apparatus radiates radio search signals with their carrier frequency in the S-band frequency range, successively in different azimuthal directions through a wide angular range, receives echo signals, and displays the echo signals on the screen of an indicator in such a manner that the echo signal reflected by a bird is clearly distinguished from the other objects, thereby locating the bird and detecting a fish school under the bird.