EE5602_3_ARFaMT_ELL&PI&TAP&SS&DS

EE5602_3_ARFaMT_ELL& - Ell Matching Using Smith Chart(CCT A C L Y y1 0 y 1 lo c u s z in z 1 lo c u s z in a r e a Ell Matching Using Smith

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Unformatted text preview: Ell Matching Using Smith Chart (CCT A) C L Y y1 0 y 1 lo c u s z in z 1 lo c u s z in a r e a Ell Matching Using Smith Chart (CCT B) L C Z y in y 1 lo c u s y in a r e a z 0 z 1 lo c u s 1 Ell Matching Using Smith Chart (CCT C) L C Y y 1 lo c u s 0 y in z 1 z in a r e a z 1 lo c u s Ell Matching Using Smith Chart (CCT D) L C Z z z 1 lo c u s 0 y in 1 y in a r e a y 1 lo c u s 4 Other Ell Networks z in z in z in z in π Tank Circuit • For the low pass ell network an additional capacitor adds an extra degree of freedom. Other combinations possible z 1 L C Y 0 z 1 L y in C y1 y in 1 C Y 0 Tapped Inductor/Capacitor C L 1 L 2 C Y 0 L 2 L 1 Y 0 z2z z1 in z in z 2 z 1 • Can be used as an impedance transformer • Tapped capacitor circuit has the same characteristics Single Stub Matching y1 d l Y yL L A d m itta n c e C h a rt l yL y0 y1 d -jb + jb o /c jb y0 o /c Double Stub Matching • Offers more flexibility in tuning with a fixed d. -jb Z 0 + jb d o /c o r s /c Z d 0 Z -C h a rt o /c o r s /c gen. Z -C h a rt λ /8 Z z 0 1 λ /4 o /c o r s /c Z Z -C h a rt 0 z 1 o /c o r s /c Z -C h a rt λ/8 Z o /c o r s /c λ/4 Z 0 0 M a tc h a b le area Z -C h a rt M a tc h a b le area o /c o r s /c Z -C h a rt Constant Q Matching Z L Z L Z L Z -C h a rt Matching Consideration • Performance – Lumped component and transmission line losses – Inherent bandwidth f0/Q0 – Fano’s limit ∫ ∞ 0 ln • Size 1 π dω ≤ Γ RC – Lumped components usually use up less board space – Transmission lines usually use up more board space • Cost – Lumped components are usually more expensive especially L – Transmission lines are usually less expensive if space is plentiful ...
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This note was uploaded on 01/11/2011 for the course EE 5602 taught by Professor Wingshingchan during the Spring '10 term at City University of Hong Kong.

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EE5602_3_ARFaMT_ELL& - Ell Matching Using Smith Chart(CCT A C L Y y1 0 y 1 lo c u s z in z 1 lo c u s z in a r e a Ell Matching Using Smith

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