Benjamin D. Braaten North Dakota State University Electrical and Computer Engineering Assistant Professor Benjamin.Braaten@ndsu.edu Poster Title: Analysis on the Coupling Between Right-Handed and CRLH Transmission Lines Abstract: One aspect of the Electromagnetic Compatibility (EMC) analysis of RF circuitry is the accurate modeling of the coupling between printed transmission lines. Correct modeling of this coupling is essential because unwanted noise voltages can be substantial and create adverse effects on sensitive components. In this work, new analytical expressions for the coupled near- and far-end voltages on a CRLH-TL have been derived and successfully validated with full-wave simulations, circuit modeling and measurements. These expressions are then used to illustrate how the induced voltages on the CRLH-TL can be reduced by the capacitance and inductance values that support left-handed propagation. This technique could be useful, because reducing left-handed inductance and capacitance of CRLH-TL could be used in place of conventional shielding. Furthermore, design guidelines and trade-offs are presented on the layout of CRLH-TL near other printed transmission lines. The expressions derived in this work are validated with simulations and measurements.
Poster Title: A Tunable Metasurface for EMI Shielding Abstract: In this work, a compact tunable metasurface for dual-band electromagnetic interference (EMI) shielding is being proposed. In particular, Jerusalem crosses intersecting diagonally are used to design and synthesize a prototype metasurface shield. It has been shown that a finite 4 x 3 array of the Jerusalem crosses can be used for EMI shielding in the 900 MHz and 1.8 GHz GSM bands. Then, to develop an active shield that is tunable, varactor diodes were attached to the dual-band metasurface. Measurements have shown that the lower band of the metasurface can be changed (tuned) with various control voltages. Finally, simulation, equivalent circuit computations and measurements are shown to agree throughout the paper