Your SlideShare is downloading. ×
Impedance Matching
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Saving this for later?

Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime - even offline.

Text the download link to your phone

Standard text messaging rates apply

Impedance Matching

1,091
views

Published on

Published in: Technology, Business

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,091
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
41
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Impedance Matching Microwave Engineering CHO, Yong Heui
  • 2. Microwave Engineering1. Impedance matching Maximum power transfer 출처 : KAIST  Condition - Z 0 = ( Z L )*  Matching network  Reflection  No reflection - Z0 = Z L Phase shifter 2 EM Wave Lab
  • 3. Microwave Engineering1. Impedance matching Matching with lumped elements  Compact size  Difficulties in finding the proper value of L or C  L-network, T-network, and Π-network 3 EM Wave Lab
  • 4. Microwave Engineering1. Impedance matching Procedure: L-network  Define zL = Z L / Z0  Draw yL = 1 / zL  Find jB to intersect the circle z L = 1 + jx  Draw zL  Find jX to cancel out jx zin = 1 + jx + jX = 1 4 EM Wave Lab
  • 5. Microwave Engineering1. Impedance matching Example  Design the L section matching network to match the transmission line, where Z L = 200 − j100[ Ω], Z 0 = 100[ Ω], f = 500 MHz Smith chart 5 EM Wave Lab
  • 6. Microwave Engineering1. Impedance matching Single-stub matching  Open stub and short stub Short stub (L) Open stub (C) 6 EM Wave Lab
  • 7. Microwave Engineering1. Impedance matching Single-stub matching  Simple matching network Smith chart 7 EM Wave Lab
  • 8. Microwave Engineering1. Impedance matching Procedure: shunt stub  Define zL = Z L / Z0  Draw yL = 1 / zL  Move to the direction of generator  Find the intersection of the circle y L = 1 + jb yin = y L + y S  Adjust the length of a shunt = 1 + jb − jb = 1 stub y S = − jb 8 EM Wave Lab
  • 9. Microwave Engineering1. Impedance matching Example  Design the single-stub shunt tuning network to match the transmission line, where Z L = 15 + j10[ Ω], Z 0 = 50[ Ω], f = 2GHz Smith chart 9 EM Wave Lab
  • 10. Microwave Engineering1. Impedance matching Double-stub matching  Fixed length between the load and stub Smith chart 10 EM Wave Lab
  • 11. Microwave Engineering1. Impedance matching Quarter-wave transformer  Easy calculation of the matching network  Narrow bandwidth characteristics Z1 = Z 0 Z L , l = λ / π 11 EM Wave Lab
  • 12. Microwave Engineering1. Impedance matching Transitions  Complicated design procedure  Broad bandwidth characteristics  The theory of small reflections  Binomial multisection line  Chebyshev multisection line  Tapered line 12 EM Wave Lab