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 (εre) and permeability (µre) 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 √(εreµre) > εr or simply with µr > εr are advantageous for both radiation efficiency and bandwidth enhancement.
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