Antenna - Theory .com: The Antenna Site

Antenna Basics Antenna Types Smith Charts Antenna Measurements

antenna-theory.com :: View topic - log spiral arm truncation in MATLAB
antenna-theory.com Forum Index antenna-theory.com
Antenna Theory
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

log spiral arm truncation in MATLAB

 
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory
View previous topic :: View next topic  
Author Message
bacurrie45
Antenna-Theory.com Newbie


Joined: 10 Dec 2014
Posts: 4

PostPosted: Thu Feb 12, 2015 4:56 pm    Post subject: log spiral arm truncation in MATLAB Reply with quote

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
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group