FIELD: antennas.
SUBSTANCE: present invention relates to an antenna structure embedded in a printed circuit board (10) containing two dielectric layers (52, 56) that have the same dielectric constant but different thicknesses, a symmetrical helical radiating element (60) on the first surface (51) of the first dielectric layer (52) and the power source of the symmetrical antenna through a symmetrical two-wire line (70) having the same impedance as the symmetrical antenna, characterized in that the symmetrical two-wire line (70) connects the symmetrical helical antenna (60) to a pair of symmetrical microstrip lines (80) transmissions located on the second surface (57) of the second layer (56), wherein each microstrip transmission line (80) is made to have an impedance equal to half the impedance of the two-wire transmission line (70), and at the same time it additionally contains a plane (85) ground located on the first surface (55) of the second layer (56), corresponding to the second surface (53) of the first layer (52), aligned with the microstrip lines (80), and the ground plane (85) is configured to determine, in depending on the thickness of the second dielectric layer (56) and the distance between the microstrips (80), the transmission impedance of the symmetrical microstrip line.
EFFECT: improving the properties of antennas, namely, the optimal characteristics of impedance matching over the entire operating frequency range; frequency response is uniform and constant over the entire operating range; strong isolation between adjacent antennas; suitable for installation on the same printed circuit board as microwave components; according to another advantageous feature of the invention, the thickness of the first layer is less than half of the maximum operating wavelength.
14 cl, 17 dwg
