EEE445_Lectr19_quarter_trns

EEE445_Lectr19_quarter_trns - 5.4 Quarter-Wavelength...

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5.4 Quarter-Wavelength Transformer Like L-networks, single-stub and double- stub tuners, a quarter-wavelength transformer provides an inherently narrowband solution. The bandwidth of the solution can be increased through the use of multiple quarter-wavelength sections. A former can only match a real impedance; other tricks (add stub, use a segment of TL) reduce bandwidth of the EEE 591/445 Lecture 19 1 λ /4
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Quarter-Wavelength Transformer Matching for Real Load EEE 591/445 Lecture 19 2 R L Z in λ /4 Z Q 2 0 Q in Q L L Z Z Z Z R R = = (5.25)
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Example: Quarter-Wavelength Transformer Matching for Real Load EEE 591/445 Lecture 19 3 0 0 10 50 300 MHz L R Z f = = = 0 500 22.4 Q L Z Z R = = =
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Example: Quarter-Wavelength Transformer Matching for Real Load EEE 591/445 Lecture 19 4 R R1 R=10 Ohm Term Term1 Z=50 Ohm Num=1 TLIN TL1 F=300 MHz E=90 Z=22.4 Ohm S_Param SP1 Step=10 MHz Stop=1000 MHz Start=100 MHz S-PARAMETERS
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Example: Quarter-Wavelength Transformer Matching for Real Load EEE 591/445 Lecture 19 5 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.1 1.0 -50 -40 -30 -20 -10 -60 0 freq, GHz dB(S(1,1))
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Matching for Complex Load Design a matching network to match a load impedance consisting of a 60 ohm resistor in series with a 0.995 pF capacitor using a quarter-wavelength transformer. Assume a design frequency of 300 MHz.
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This note was uploaded on 12/14/2010 for the course EEE 445 taught by Professor Georgepan during the Fall '10 term at ASU.

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EEE445_Lectr19_quarter_trns - 5.4 Quarter-Wavelength...

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