English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

In this paper, a numerical method has been proposed for the analysis of highlydispersivelinear and non-linear metamaterial structures. Initially, pulse propagationalong non-linear composite right/left-handed transmission line (CRLH TL) has beencarefully studied. For this purpose, a dispersive CRLH line has been loaded with hyperabrupt diodes to achieve non-linearity. The characteristic impedance and propagationconstant of each unit cell of the CRLH TL is then varied at each time-step, and the nonuniformline is analyzed. A novel interpolation scheme, based on the smooth behaviourof the propagation constant with small variations of the shunt capacitor has beenproposed. This scheme has provided an 80% reduction of the computational costmaintaining high accuracy. A general example which combines dispersion and nonlinearityhas finally been presented, validated and discussed. Secondly, the impulseregimeradiation of a leaky-wave antenna has been analyzed and employed to describe areal-time spectrogram analyzer (RTSA). A calibration method for the system, whichtakes into account the directivity variation of the antenna with frequency, has beenintroduced. Numerical results have shown that the proposed technique provides anextremely fast and accurate tool to characterize leaky-wave based RTSA systems.This work was partially supported by the Spanish Ministry of Education and Scienceunder Grant FPU-AP2006-015 and with the Project TEC2007-67630-C03-02

Efficient time-domain analysis of highly dispersive linear and non-linear metamaterial waveguide and antenna structures operated in the impulse-regime