DOI: 10.1049/mia2.70129 ISSN: 1751-8725
New Dual‐Polarised Fractal FSS Frequency Discriminators for IFM Based on Balanced Gray‐Code
Pedro Cavalcanti, Jorge Antonio Araujo, Alfredo Gomes Neto, Gabriel Gonçalves Machado, Ingryd Melo, Isaac B. T. Silva, Marcos Tavares de MeloABSTRACT
Four new fractal frequency selective surfaces (FSS) wideband discriminators for instantaneous frequency measurement (IFM) systems based on the balanced Gray‐code are presented in this paper. The use of a balanced binary code in the design of the discriminators enables the implementation of a 4‐bit IFM system using only dual‐band discriminators, operating in the 1.2–5.6 GHz range. The FSS patterns are based on recursive Sierpinski space‐filling geometries, which allow a significant reduction in the size of the discriminators while enabling dual‐polarisation operation. The numerical analysis is compared with the experimental data with good agreement, demonstrating the feasibility of compact low‐frequency FSS‐based IFM.