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Optimizing Microstrip Lines Using Defected Ground Structures (DGS)

Optimizing Microstrip Lines Using Defected Ground Structures (DGS). Chris Raider. Introduction. What do we already know? What are Defected Ground Structures? How can they be used to optimize microstrip lines?. Benefits of DGS. Suppress unwanted signals Allow for more compact dimensions

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Optimizing Microstrip Lines Using Defected Ground Structures (DGS)

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  1. Optimizing Microstrip Lines Using Defected Ground Structures (DGS) Chris Raider

  2. Introduction • What do we already know? • What are Defected Ground Structures? • How can they be used to optimize microstrip lines?

  3. Benefits of DGS • Suppress unwanted signals • Allow for more compact dimensions • Stopband Effects, Slow wave Effect, High ZO

  4. Various Geometries • Dumbbell: • Slot:

  5. Designing DGS • Equivalent circuit dependent on S-Parameters • No direct correlation between physical dimensions and LC parameters • Guess and check method

  6. Equivalent Circuits • LC / RLC Circuit • Pi Shaped Circuit • Quasi-Static Circuit

  7. Next Research Steps… • Look into an “easier” geometry • May simulate, will attempt to mathematically evaluate • Finish the report

  8. References http://www.analog.com/static/imported-files/rarely_asked_questions/breadboard_figure22.gif http://mwrf.com/passive-components/dgs-and-multilayer-methods-make-lpf Weng, L.H. "An Overview on Defected Ground Structure."Progress In Electromagnetics Research. 7. (2008): 173-189. Print. Ahn, Dal. "A Design of the Low-Pass Filter Using the Novel Microstrip Defected Ground Structure." IEEE Transactions on Microwave Theory and Techniques. 49.1 (2001): n. page. Print. Peng, Lin. "A Novel Periodic Defected Ground Structure for Microstrip Line with Improved Performances."Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications. (2009): n. page. Print.

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