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Novel Design of Robust and High-performance Multi-stage Directional Filter for Multiplexing Application

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  • PhD Defenses
When Apr 09, 2013
from 03:00 PM to 04:30 PM
Where Engr. IV Bldg. Tesla Rm. 53-125
Contact Name
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Shih-Peng Sun

Advisor: Professor Tatsuo Itoh



The increased demand for wireless connectivity is leading to radio spectrum scarcity. Thus, the requirement for the front-end multiplexer has become increasing demanding. Directional filter (DF) is an attractive candidate for multiplexing large numbers of frequency channels, since by using DF, the design of a complex multiplexer can be broken down to individual DF module for each frequency channel. However, the reported DF module designs are either cumbersome, require very stringent manufacture tolerance, or cannot realize high-performance filtering function.

In this talk, we present a new DF module design method. This method allows designer to adapt any desired high-performance filtering function using a robust structure. This leads to a high-performance module with more relaxed manufacture tolerance, making DF more competitive against other multiplexing schemes. The filtering function of this new DF can be synthesized using conventional filter synthesis method. Therefore, we can benefit from the decades of research on filter synthesis. We will also discuss about the limitations and drawbacks of this new design, and possible ways to improve this DF structure. This includes using Composite Right/Left-handed transmission lines to improve the isolation, incorporate new filter structures, and use even-mode matching network for sharp and deep cut-off.



Shih-Peng Sun received the B.S. degree in Electrical Engineering from National Taiwan University, Taiwan, and M.S. degree from University of California, Los Angeles, in 2006 and 2008, respectively. He is currently a Ph.D. candidate in the Electrical Engineering Department at UCLA. His research interests include tunable filters, multiplexers, antenna and frequency dependent antenna arrays.

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