Impedance Matching
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The document discusses impedance matching in antenna engineering, covering concepts like maximum power transfer, matching networks, and various matching techniques such as single-stub and double-stub matching. It emphasizes the use of Smith charts for visualizing impedance and the challenges involved in designing effective matching networks. Additionally, it explores different structures like L-networks and quarter-wave transformers while noting their respective bandwidth characteristics.
Impedance Matching
- 1. Antenna Engineering CHO, Yong Heui Impedance Matching
- 2. 1. Impedance Matching Basic Concept Voltage or Current -> Ratio is a key factor Load Wave
- 3. Maximum power transfer 1. Impedance matching Condition for maximum power transfer Matching network - Usually source and load are fixed. Reflection - Conjugate matching doesn’t mean no reflection. No reflection
- 4. 출처 : KAIST 1. Impedance Matching Variable Phase Shifter
- 5. Matching with lumped elements Compact size Difficulties in finding the proper value of L or C L-network, T-network, and -network 1. Impedance matching
- 6. Procedure: L-network Define Draw Find to intersect the circle Draw Find to cancel out 1. Impedance matching
- 7. Example Design the L section matching network to match the transmission line, where Smith chart 1. Impedance matching
- 8. Single-stub matching Open stub and short stub Short stub (L) Open stub (C) 1. Impedance matching
- 9. Single-stub matching Simple matching network Smith chart 1. Impedance matching
- 10. Procedure: shunt stub Define Draw Move to the direction of generator Find the intersection of the circle Adjust the length of a shunt stub 1. Impedance matching
- 11. Example Design the single-stub shunt tuning network to match the transmission line, where Smith chart 1. Impedance matching
- 12. Double-stub matching Fixed length between the load and stub Smith chart 1. Impedance matching
- 13. Quarter-wave transformer Easy calculation of the matching network Narrow bandwidth characteristics 1. Impedance matching
- 14. Transitions Complicated design procedure Broad bandwidth characteristics The theory of small reflections Binomial multisection line Chebyshev multisection line Tapered line 1. Impedance matching