EEE445_Lectr26_T_W

EEE445_Lectr26_T_W - 7.2 T-Junction Power Divider Overview...

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7.2 T-Junction Power Divider Overview of T-Junction Power Divider A simple three-port network that can be implemented in any transmission media, microstrip and waveguide. Recall that a three-port cannot be simultaneously matched, reciprocal, and lossless. If matched and lossless, it must be a circulator (non- reciprocal). If lossless and reciprocal, all ports cannot be matched (reactive power divider, e.g., Fig. 7.3). If matched and reciprocal, it cannot be lossless (resistive power divider). EEE 591/445 Lecture 26 1
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Fig. 7.5 shows the T-junctions in waveguide and microstrip form. For waveguide, we have the E-plane and H- plane T. Fig. 7.6 EEE 591/445 2 Lecture 26
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Lossless T-junctions of Fig. 7.5 can all be modeled as a junction of three transmission lines, as show in Fig. 7.6. fringing fields and higher order modes associated with the discontinuity at junction, leading to stored energy that can be represented by lumped susceptance, B. Fig. 7.6 P1 P2 P3 EEE 591/445 3 Lecture 26
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We also assume B=0 in practice, if B is not negligible, some type of reactive tuning element can usually be added to the divider. 0 2 1 0 2 1 1 1 1 1 1 1 Z Z Z Z Z Z jB Y in = + = + + = (7.24) (7.25) EEE 591/445 4 Lecture 26
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Reactive Power Divider EEE 591/445 Lecture 26 5 IN COUPLED 1 COUPLED 2 0 Z 1 Z 2 Z
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Reactive Power Divider For match at input: For equal power split: The corresponding S-matrix EEE 591/445 Lecture 26 6 0 1 2 1 1 1 Z Z Z = + 1 2 0 2 Z Z Z = = 1 1 0 2 2 1 1 1 2 2 2 1 1 1 2 2 2         -       -     ( 29 ( 29 22 33 12 13 23 23 100// 50 100 1 100// 50 100 2 1 equal power split 2 S S by unitary S S S S  - = = =- + ⇐ = = ← = ← Fig. 7.6 P1 P2 P3
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ADS Analysis of 3dB Reactive Power Divider Using Ideal Transmission Lines EEE 591/445 Lecture 26 7 Term Term3 Z=100 Ohm Num=3 Term Term2 Z=100 Ohm Num=2 TLIN TL3 F=4 GHz E=90 Z=100 Ohm TLIN TL2 F=4 GHz E=90 Z=100 Ohm TLIN TL1 F=4 GHz E=90 Z=50.0 Ohm Term Term1 Z=50 Ohm Num=1 S_Param SP1 Step=0.1 GHz Stop=4.8 GHz Start=3.2 GHz S-PARAMETERS
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ADS Analysis of 3dB Reactive Power Divider Using Ideal Transmission Lines EEE 591/445 Lecture 26 8 3.4 3.6 3.8 4.0 4.2 4.4 4.6 3.2 4.8 -320 -315 -310 -325 -305 freq, GHz dB(S(1,1)) Input Match S11 is essentially zero
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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_Lectr26_T_W - 7.2 T-Junction Power Divider Overview...

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