NEAR-OMNIDIRECTIONAL ANTENNA Russian patent published in 1997 - IPC

FIELD: radio engineering; antenna engineering. SUBSTANCE: antenna has radiating disk 2 placed in parallel with screen 1 and closed through screen in center. Exciting member in the form of double-ended coupled strip line is inserted between radiating disk and screen. External ends of coupled line form open tuned circuit. In particular case, tuned circuit may be U-shaped. One conductor 3 of coupled strip line is connected to feeder in center of antenna. Peripheral ends of two other conductors 5 and 7 are connected on one end to radiating disk and on other one, to screen. Connected in parallel with radiating disk edge is cylindrical conductor of height , where λ_o is wavelength in free space. Conductor radius ; radiating disk radius R₁= R₂/(1,1...1,6); height of member shorting out radiating disk through screen b=2h/3. When inner space is filled with dielectric of dielectric constant ε_r, basic overall dimensions are determined by expression h = (0,15...0,2)R₂, R₂= λ_d/4, where λ_d is wavelength in dielectric; . EFFECT: enlarged working frequency range; improved operating stability of antenna radiator. 3 cl, 7 dwg