329fall08hw13

329fall08hw13 - ECE 329 Homework 13 Due: Thu, Dec 4, 2008,...

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Unformatted text preview: ECE 329 Homework 13 Due: Thu, Dec 4, 2008, 5PM 1. Smith Chart derivation: Since = z- 1 z + 1 = r + jx- 1 r + jx + 1 = [( r- 1) + jx ][( r + 1)- jx ] ( r + 1) 2 + x 2 = ( r 2 + x 2- 1) + j 2 x ( r + 1) 2 + x 2 r + j i , it follows that r = ( r 2 + x 2- 1) ( r + 1) 2 + x 2 and i = 2 x ( r + 1) 2 + x 2 , where r and x are normalized line resistance and reactance, respectively, and r and i denote the real and imaginary parts of reflection coefficient . Using the above expressions for r and i , it can be shown that the following relations are valid: ( r- r r + 1 ) 2 + 2 i = ( 1 r + 1 ) 2 constant r circles ( r- 1) 2 + ( i- 1 x ) 2 = ( 1 x ) 2 constant x circles a) Smith Chart construction: The equations above describe circles on the complex -plane with r and x dependent centers and radii, respectively. Using a compass, draw constant r circles (on a plane with r and i axes) for the values of r = 0 , 1, 2, set the scales of your axes such...
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329fall08hw13 - ECE 329 Homework 13 Due: Thu, Dec 4, 2008,...

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