EEE445_Lectr17_stub_smith

EEE445_Lectr17_stub_ - Transmission Line Stubs 5.2 Single stub tuning 5.3 Double stub tuning • For coax or waveguide we usually prefer to use

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Unformatted text preview: Transmission Line Stubs 5.2 Single stub tuning, 5.3 Double stub tuning • For coax or waveguide, we usually prefer to use SC (short circuited) stubs since OC stubs tend to radiate. • For planar transmission media (such as microstrip and stripline), we tend to use OC stubs because they are easier to fabricate. • Shunt stubs are generally easier to fabricate than series stubs in all transmission media. EEE 591/445 1 Lecture 17 • Single stub matching Fig. 5.4 Z S jB L L L jX R Z + = Z Z Z in = d Shunt Single-Stub Matching EEE 591/445 2 Lecture 17 Example. A load impedance Z L = 200 + j 160 Ω is to be matched to a 100 Ω transmission line using a single shunt stub tuner. Find two solutions using open-circuited stubs. 1. Smith chart solution. (1). Normalized load z L = 2.0 + j 1.60 (2). Draw the SWR circle passing z L. Admittance y L = 0.31- j0.24, location 0.042 (L) (3). Moving clockwise on SWR to meet 1+jb at 0.172 (G) and 0.328 (G). EEE 591/445 3 Lecture 17 EEE 591/445 Lecture 17 4 o Z L Y L 1-j1.32 1+j1.32 Admittance circle Of 1+jb SWR (impedance) circle .042(L) .172(G) .328(G) Smith chart solution (5). Stub length OC stub: start from 0 clockwise to get (i). –j1.32, reading (ii). +j1.32, reading 1 0.353 ....
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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_Lectr17_stub_ - Transmission Line Stubs 5.2 Single stub tuning 5.3 Double stub tuning • For coax or waveguide we usually prefer to use

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