Printed inverted-F antennas over lossy magneto-dielectric materials: Theoretical approach and validations

Constant Niamien (1) , Manouan Aka Constant Niamien (2) , Sylvain Collardey (3) , Ala Sharaiha (3) , Kourosh Mahdjoubi (3)

1 Pôle Electronique et Systèmes
2 ESIGELEC - École Supérieure d’Ingénieurs en Génie Électrique
3 IETR - Institut d'Électronique et des Technologies du numéRique

Closed-form formulas for radiation efficiency and bandwidth predictions, suitable for printed inverted-F antennas (PIFAs) over lossy magneto-dielectric materials, are proposed. The formulation uses the field expressions inside the cavity for the first resonant-mode (fundamental mode) based on the cavity model. It includes the substrate effective permittivity (ε re) and permeability (µ re) in addition to the radiation from both the shorting-pad and the slot. The derived expressions for efficiency and bandwidth are validated with measurements and full-wave CST simulations based on the finite integration technique. Various sizes and types of magneto-dielectric materials are considered. It is noticed that magneto-dielectric materials having √(ε re µ re) > ε r or simply with µ r > ε r are advantageous for both radiation efficiency and bandwidth enhancement.

Domaines: Electromagnétisme; Matériaux; Electronique

Constant Niamien, Manouan Aka Constant Niamien, Sylvain Collardey, Ala Sharaiha, Kourosh Mahdjoubi. Printed inverted-F antennas over lossy magneto-dielectric materials: Theoretical approach and validations. IET Microwaves Antennas and Propagation, 2014, 8 (7), pp.513-522. ⟨10.1049/iet-map.2013.0244⟩. ⟨hal-02428424⟩