Lecture on Smith Chart

Smith Chart

The real part of r +jx

Constant r circles

Constant x circles

Superimposition of constant x and constant r circles gives smith chart

Some examples using Smith chart

1 st Example

2nd example

3rd Example

4th example

5th example

Single-stub matching:

d

l

LZByiy

syoR Ly

oRRequirement: oi YY or osB YYY or 1yy sB

For short-circuit stub,Bs jby

BB jb1y (bB is real)

Hence, we have to find d such that has a unity real part and to find the length l of the stub required to cancel the imaginary part.

By

N.B. short-circuited stub is preferred.

g=1 circle

SCOC

Ly

Lz

Bjb

Bjb

B1B jb1y (2)

(5)

(4)

(3)

(1)

Short-circuited stub