Experiment 5 â Coupler Design.

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Z 0 Z 0 Through wave R 2 Z 0 Sampled wave R 1 Figure 3 - Resistor divider non-directional coupler. The transmission lines are not electromagnetically coupled and the coupling equations are derived from the lumped circuit calculation of the resistor divider. 3.2 Coupled Line Directional <strong>Coupler</strong> 3.2.1 A Single Section <strong>Coupler</strong> There are two modes of current flow in an electromagnetic situation. The first is one current flowing down one conductor with a contra-flow current back up the other conductor caused by displacement current coupling between the two conductors. This is termed the ’odd mode’ current, and it has an associated odd mode characteristic impedance, styled Z 0o . Theothermodeisonecurrentflows by displacement current between each center conductor carrying the same polarity, and the ground that is common between them. Hence this is called the ’even mode’ current, and it has an associated even mode characteristic impedance, styled Z 0e .Figure4 shows the polarity of the lines of each mode. For a single section coupler the even and odd mode characteristic impedances are defined as: 6
1+C Z 0e = Z 0 1 − C , (2) r 1 − C Z 0o = Z 0 1+C Where C
Page 1 and 2: Experiment5—CouplerDesign. Dr. H
Page 3 and 4: 3. For a 20 dB three sections edge
Page 5: Forward wave 1 2 Through wave Sampl
Page 9 and 10: Because of the symmetry of the stru
Page 11 and 12: SSub SSUB SSub1 Er=4.7 Mur=1 B=0.32
Page 13 and 14: Figure 3 - Defining the first strip
Page 15 and 16: Figure5-Pickingthefaceoftheendofthe
Page 17 and 18: 1. Add the curved edge to the first
Page 19 and 20: Figure 11 - Mirroring again the str
Page 21 and 22: 4.2.3 Calculating the Even and Odd
Page 23 and 24: Press on the ’Define Pins...’ b
Page 25 and 26: Figure 19 - Odd mode definition. 7.
Page 27: 4.4 Final Report Requirements 1. At

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Experiment 5 â Coupler Design.