Combining Metamaterials And Electromagnetic Bandgap Structures To Enable Multifunctional Compact Antennas And Systems

2022-11-22 Prof. Ashwin K Iyer, Vice Chair (Undergraduate), Department of Electrical and Comp

ABSTRACT :

Metamaterials (MTMs) and electromagnetic bandgap structures (EBGs) are related technologies that have seen growing adoption in antenna systems. However, the utility of the EBG bandgap often comes at the expense of the typically large EBG unit cells that limits their inclusion in highly space-constrained scenarios, e.g. within microstrip devices and antennas. On the other hand, many MTMs, such as the transmission-line (TL) MTM, afford very small unit cells through reactive loading but aren’t specifically designed to support controllable bandgap behaviour. A new technology known as the metamaterial-based electromagnetic bandgap structure (MTM-EBG) has proven successful in achieving strong and predictable bandgaps in compact microstrip structures. The bandgap behaviour is achieved in a compact fashion by embedding a multiconductor TL within the microstrip, and then using TL MTM-based reactive loading concepts to force the contradirectional coupling of supported TL modes. Importantly, the MTM-EBG is uniplanar, without vias, and can be fully printed, making it particularly useful for simple and cost-effective integration into microstrip antennas and feed networks. The utility of the MTM-EBG is further established by the fact that its dispersion properties may be rigorously and accurately designed using multiconductor TL theory, eliminating ad-hoc approaches and minimizing arbitrary tuning. This talk will review the many examples of MTM-EBG usage in antennas and antenna systems that have been demonstrated in the recent literature. These include rectangular and circular patch antennas have been made dual-band and/or dual-polarization by embedding MTM-EBGs onto their radiating edges, with the resulting structures being more compact than single-band antennas at the lower operating frequencies. The challenge of feeding these multi-band antennas has also been addressed with MTM-EBGs, as they have been integrated into impedance transformers, Wilkinson power dividers, and directional couplers for dual-band operation.

Event Name

Seminars

Place

Online

Start Time

18:30

End Time

20:00

External Link

PDF to Talk