showfeedingnet.java

天线阵列的涉及软件

/*
 *	ShowFeedingNet	
 *
 *	Button action to read current taper and performances
 *	Calculate feeding line length then call the drawer to show on the screen
 *
 *	Meirong He
 *	EEE Department
 *	University of Sheffield
 *	July 2005
 */

import java.awt.*;
import java.awt.event.*;

public class ShowFeedingNet implements ActionListener {
	
	private Button button;
	private AntennaDesigner taper;
		
	public ShowFeedingNet (Button bb, AntennaDesigner tt) {	
		button=bb;
		taper=tt;
	}
	
	public void actionPerformed (ActionEvent e) {
		
		taper.screen.clear();
		
		int N=taper.N;
		int V=(int)Math.ceil(Math.log(N)/Math.log(2));
		double mmdeg=taper.lamda/360.0; 
		double pitch=taper.lamda*Double.parseDouble(new String(taper.spacing.getText()));
		
		double[] l=new double[N];
		double [][] tl=new double[N][V];
		double [][] sectl=new double[N][V];
		double [][] s=new double[N][V];
		double [][] d=new double[N][V];
						//Set up variables necessary
									
		for (int i=0; i<N; i++) 
			l[i]=mmdeg*Double.parseDouble(new String(taper.phase[i].getText()));
						//Read current phases and obtain feeding length
		
		for(int k=0;k<V;k++) {
			for (int i=0; i<N; i++) {
				tl[i][k]=0; s[i][k]=0; d[i][k]=0; sectl[i][k]=0; 
			}	
		}
		
		////Calculation of feeding line lenth///////////////////
		
		int shift1=0, shift2=0, P=N;
		
		for (int k=0; k<V; k++) {
			
			boolean odd=(P%2!=0);
			if(odd) shift2=shift1+(int)Math.pow(2,k);
			
			/////////Obtain elements feeding line length sums and differences//////////
			
			for (int i=0; i<(int)Math.ceil(P/2.0); i++) {
				if(odd) {
					if(k==0) {
						if(i==1) s[i][k]=0; 
						else s[i][k]=pitch;
						
						if(i==0) d[i][k]=l[1]-l[0];
						else if(i==1) d[i][k]=0;
						else d[i][k]=l[2*i]-l[2*i-1];
					}
					else {
						if(i==0) s[i][k]=s[0][k-1]+s[1][k-1]+pitch;
						else if(i==1) s[i][k]=s[2][k-1];
						else s[i][k]=s[i*2-1][k-1]+s[i*2][k-1]+pitch;
						
						if(i==0) d[i][k]=l[(int)Math.pow(2,k+1)-1-shift1]-l[0];
						else if(i==1) d[i][k]=d[2][k-1];
						else d[i][k]=l[(i+1)*(int)Math.pow(2,k+1)-1-shift2]-l[i*(int)Math.pow(2,k+1)-shift2];
					}
				}
				else {
					if(k==0) s[i][k]=pitch;
					else s[i][k]=s[i*2][k-1]+s[i*2+1][k-1]+pitch;
					
					if(i==0) d[i][k]=l[(int)Math.pow(2,k+1)-1-shift1]-l[0];
					else d[i][k]=l[(i+1)*(int)Math.pow(2,k+1)-1-shift2]-l[i*(int)Math.pow(2,k+1)-shift2];
				}
			}	
			
			
			/////////Obtain feeding line lengths from nodes to elements///////////////	
			
			if(k==0 && odd ) 
				for (int i=0; i<P; i++) 
					if(i==0 || i==1)  tl[i][k]=(s[0][0]-Math.pow(-1, i)*d[0][0])/2;
					else if(i==2) tl[i][k]=0;
					else tl[i][k]=(s[(int)Math.ceil(i/2.0)][0]+Math.pow(-1, i)*d[(int)Math.ceil(i/2.0)][0])/2;
			else 
				for (int i=0; i<(int)Math.ceil(P/2.0)*2; i++) 
					tl[i][k]=(s[(int)(i/2.0)][k]-Math.pow(-1, i)*d[(int)(i/2.0)][k])/2;
			
			//////////Obtain feeding line lengths in each sector////////////////
			
			for (int i=0;i<P;i++)
				if(k==0) sectl[i][k]=tl[i][k];
				else if(odd) {
					if(i==0) sectl[i][k]=tl[i][k]-tl[i][k-1];
					else if(i==1) {
						if(k==1 & N%2!=0 ) sectl[i][k]=tl[i][k]-tl[2][k-1];
						else sectl[i][k]=tl[i][k]-tl[3][k-1];
					}
					else if(i==2) sectl[i][k]=0;
					else 
						if(k==1) {
							if( N%2!=0 & i%2==0) sectl[i][k]=tl[i+1][k]-tl[2*i][k-1];
							else if(N%2!=0 & i%2!=0) sectl[i][k]=tl[i+1][k]-tl[2*i-1][k-1];
							else if(N%2==0 & i%2==0) sectl[i][k]=tl[i+1][k]-tl[2*i+1][k-1];
							else sectl[i][k]=tl[i+1][k]-tl[2*i][k-1];
						}
						else
							if(i%2==0) sectl[i][k]=tl[i+1][k]-tl[2*i+1][k-1];
							else sectl[i][k]=tl[i+1][k]-tl[2*i][k-1];
				}
				else {
					if(k==1 & i>0 & N%2!=0) 
						if(i%2==0) sectl[i][k]=tl[i][k]-tl[2*i-1][k-1];
						else sectl[i][k]=tl[i][k]-tl[2*i][k-1];
					else
						if(i%2==0) sectl[i][k]=tl[i][k]-tl[2*i][k-1];
						else sectl[i][k]=tl[i][k]-tl[2*i+1][k-1];
						
				}			
			
			if(odd) shift1=shift1+(int)Math.pow(2,k);
			P=(int)Math.ceil(P/2.0);
		}
		
		taper.screen.drawFeedingNet(sectl, N, V);
	}
}