Normal Mode: Cross-Helix For Circular Polarization

CIBSTRACT Moment method !solut ion f o r t he normal mode cross-hel ixes as an antcenna and as a s c a t t e r e r w i l l be invest igated. The i n p u t impedance a t one h e l i x w i t h the o ther one short c i r c u i t e d p a r a s i t i c element i s determined. The backscat ter ing Radar Cross Sect ion o f the s t ruc tu re , when i l l u m i n a t e d bly a plane wave of c i r c u l a r left-handed p o l a r i z a t i o n from the z-axis d i r e c t i o n , i s i nves t i ga ted w i t h vary ing the parameters o f t t w h e l i x , as the number af tu rns a id t t ie p i t c h angle cn, I t ir; slmwn t h a t wider half-BSCS angle can be obtained from a h e l i x of smal l p i t c h angle and the a x i a l r a t i o and the BSCS va lue can be improved by inc reas ing the number o f t u r n s o f tlhe h e l i x ,