Repozytorium publikacji - Politechnika Gdańska

Application-driven design of antenna systems fosters a reuse of structures that have proven competitive in terms of their electrical and field performance, yet have to be re-designed for a new application area. In practice, it most often entails relocation of the operating frequencies or bandwidths, which is an intricate endeavor, normally requiring utilization of numerical optimization techniques. If the center frequencies of the available design reside away from the targets, local routines tend to be inadequate, whereas global procedures incur extraordinary computational costs, which may be unmanageable if antenna characteristics are evaluated using full-wave electromagnetic (EM) analysis. Recently, a procedure involving a combination of joint parameter scaling and intermittent local tuning has been proposed and shown effective in re-design of single-band microwave devices across broad ranges of operational frequencies. Here, we introduce a generalized framework that capitalizes on the aforementioned concept but enables independent scaling of multiple operating frequencies. The fundamental component of the developed approach is identification of orthogonal scaling directions affecting individual center frequencies, which is a non-trivial extension of concurrent parameter adjustment. Our technique has been validated using several multi-band antennas, all re-designed for operating conditions unreachable using conventional tuning methods. Superior performance has been demonstrated for all considered cases in terms of a precise allocation of antenna resonances while maintaining low computational cost, lower than 180 EM antenna analyses on the average. Experimental validation has been also provided.

Autorzy

• dr hab. inż. Anna Pietrenko-Dąbrowska link otwiera się w nowej karcie ,
• prof. dr inż. Sławomir Kozieł link otwiera się w nowej karcie