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z<br />
<br />
y<br />
<br />
z<br />
Single-Stub <strong>Matching</strong> Networks<br />
Z<br />
L 60 j45<br />
<br />
<br />
Zin<br />
75 j90<br />
<br />
Z 75 <br />
0<br />
L<br />
L<br />
in<br />
Z<br />
L<br />
/ Z<br />
0<br />
0<br />
<br />
0.<br />
8<br />
<br />
j0.<br />
6<br />
1/<br />
zL<br />
0.<br />
8 j0.<br />
6<br />
Z / Z 1<br />
j1.<br />
2 <br />
in<br />
5-20<br />
g = 0.8<br />
conductance circle<br />
zL to A (yA= 0.8 + j1.5) by adding a shunt open-circuited (O.C.)TL lSA<br />
4 adjustable parameters:<br />
l , Z l , Z )<br />
( s 0s, L 0L,<br />
Input SWR circle associated with zin<br />
has two intersected points (A & B) with<br />
g = 0.8 conductance circle<br />
yA= 0.8 + j1.05 yB= 0.8 - j1.05<br />
The corresponding susceptance for the stub : jbSA= yA- yL = (0.8 + j1.05)-( 0.8 + j0.6)=0.45<br />
O.C. point (g=0) to the point of ibSA = 0.45 is lSA = 0.067 <br />
2011-12 H.-R. Chuang EE NCKU<br />
A to zin is lLA = 0.266 <br />
g = 0<br />
(O.C.)<br />
ibSA<br />
= 0.45
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