PRINTED-CIRCUIT LOOP ANTENNA Russian patent published in 2004 - IPC

FIELD: linearly and circularly polarized printed-circuit loop antennas for television and communications. SUBSTANCE: antenna has nonsplit square or rectangular loop on one side of dielectric strip and short- or open-circuited length of rectilinear conductor or that bent under sides or part of loop circumference on back side of strip; it is excited directly by coaxial cable in center of loop side, in corner, or at any point of circular loop. For linear polarization metal-plated square, rectangle, or circle, or square- rectangle-, or rung-shaped loop or any other component of almost similar shape, or simple metallized layer inside or outside loop is disposed inside or outside active loop in certain space relation; external conductor (braiding) of coaxial power cable is connected to active loop and central conductor, to open- or short-circuited conductor length. For circular polarization during excitation of square or rectangular loop in center of one of sides adjacent to side of loop having no open-circuited conductor length on back side of dielectric strip under this side of loop is shorted out through gap to solid square, rectangle, or loop, or metallized layer inside or outside actively excited loop. For operation at several frequencies additional square, rectangular, or circular active loops with respective open- or short-circuited conductor lengths on back side of dielectric strip are disposed inside or outside main active loop. EFFECT: reduced resonant frequency, extended frequency band, ability of circular polarization of radiation, simplified design. 4 cl, 13 dwg