Fast Redesign of Multiband Antennas by Means of Orthogonal-Direction Geometry Scaling and Local Parameter Tuning

The application-driven design of antenna systems fosters reusing of structures that have proven competitive in terms of their electrical and field performance, yet have to be redesigned for a new application area. Recently, procedure integrating a combination of joint parameter scaling and intermittent local tuning has been proposed and shown effective in redesign 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 the identification of orthogonal scaling directions affecting individual center frequencies, which is a nontrivial extension of concurrent parameter adjustment. Our technique has been validated using several multiband antennas, all redesigned 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 average. Experimental validation has also been provided.