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Unformatted text preview: xtension Port extension is needed to compensate the parasitic delay introduced by elements between the transmission line and the port on the board. III. Results obtained from VNA:  S11 plot before calibration:  S11 plot after 1 calibration under matched load :  S11 plot after calibration under open load : 2  S11 plot given by the T line before port extension   Measurement of T line delay = 119 ps Calculation of parasitic components: Since Lossless line R=L=0 j
= Z 0 ⋅ (− j.1.019) ≈ − jZ 0
wC 1
1
−12
C=
=
= 3,18 ⋅ 10 F
Z 0 ⋅ w Z 0 ⋅ 2π ⋅ f
Z in = −  Calculation of length of the T line at 1GHz frequency: oc
Z in = − jZ 0 ⋅ cot an ( βl ) = Z 0 ⋅ (− j.1.019 ) cot an ( β) = 1.019
⇒ β = 0,776 0.776
⇒=
λ = 0.123λ = 3.7 cm
2π IV. Results obtained from simulation For l=3.7 cm and frequency 1GHz E=89° 3...
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 Fall '13
 VictorPogrebnyak

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