TWO-RANGE ANTENNA Russian patent published in 1997 - IPC

FIELD: antenna equipment. SUBSTANCE: two-range antenna has metal screen 1, lower 2 and upper 3 disc radiating elements placed one above other in parallel to metal screen and separated by dielectric 4, coaxial transmission line 5, first 10 and second 11 groups of short-circuiting pins uniformly positioned between lower and upper disc radiating elements and between upper and lower disc radiating elements over their perimeters. In this case, external conductor 7 of coaxial transmission line 5 is connected to metal screen 1 and central conductor 6, to upper disc radiating element 3. Short-circuiting pins of first group 10 are displaced about central axis relative to short-circuiting pins of second group 11 and distances between any adjacent short-circuiting pins are equal. Distance between any two adjacent short-circuiting pins of first group 10 should be not less than λ₁/4, where λ₁ is wave length in free space for lower disc radiating element 2, while for second group 11, not less than λ₂/4, where λ₂ is length of wave in free space for upper disc radiating element 3. Height of short-circuiting pins for first group is h₁=(0,014÷0,02)λ₁ and diameter d₁= (4,2•10^-3÷5,2•10^-3)λ₁, height of short-circuiting pins for second group is h₂= (0,014÷0,02)λ₂ and diameter d₂= (4,2•10^-3÷5,2•10^-3)λ₂ for equal number of short-circuiting pins in both groups. Metal screen 1 can be fitted with attachment 12 securing electric contact with location surface 13. Antenna may have radioparent dome 14. EFFECT: improved operational characteristics with simultaneous increase of gain factor, simplified circuit of matching and tuning. 3 cl, 6 dwg