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bacurrie45
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Joined: 10 Dec 2014
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 Posted: Thu Feb 12, 2015 4:56 pm    Post subject: log spiral arm truncation in MATLAB Hi i have successfully managed to design a two arm log spiral antenna with the following parameters however when i simulate in MATLAB my antenna arms do not truncate in a sharp arc the way i would like. I have attached my code and a diagram of my antenna. Any help would be apprecaited a = 0.22 n = 2 turns theta range = 0 to 4*pi flow = 300Mhz fhigh = 1Ghz starting radius ro = 75mm [code]>> clear all alpha = 0.22; delta = pi/2; theta = 0:pi/60:4*pi*(2); k = 0.075; r1 = k*exp(alpha*theta); r2 = k*exp(alpha*(theta-delta)); r3 = -k *exp (alpha*theta); r4 = -k*exp(alpha*(theta-delta)); x = r1.*cos(theta); y = r1.*sin(theta); x1 = r1.*cos(theta); y1 = r1.*sin(theta); x2 = r2.*cos(theta); y2 = r2.*sin(theta); x3 = r3.*cos (theta); y3 = r3.*sin (theta); x4 = r4.*cos (theta); y4 = r4.*sin (theta); plot (x,y, 'b','linewidth',3); hold on; grid on; plot (x1,y1,x2,y2,x3,y3,x4,y4,'r','linewidth',3); hold on; grid on ; z = [x,y]; z = [x1,y1,x2,y2,x3,y3,x4,y4]; axis('equal') rotate3d on
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