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 • Stopband Effects, Slow wave Effect, High ZO
Various Geometries • Dumbbell: • Slot:
Designing DGS • Equivalent circuit dependent on S-Parameters • No direct correlation between physical dimensions and LC parameters • Guess and check method
Equivalent Circuits • LC / RLC Circuit • Pi Shaped Circuit • Quasi-Static Circuit
Next Research Steps… • Look into an “easier” geometry • May simulate, will attempt to mathematically evaluate • Finish the report
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.