Ring Resonator Loaded Log-Periodic Antenna for IEMI Detection Application

A patch-added planar log-periodic ring resonator meander dipole array (PPLPMDA) antenna with dimensions <tex-math notation="LaTeX">27 × 27 × 0.16\ cm³ </tex-math> is developed to detect an intentional electromagnetic interference (IEMI) signal in the frequency range of 0.5–2 GHz. A meander line concept has been utilized in the radiator section to lower the antenna size. The lateral dimension of the PPLPMDA antenna is smaller by 36.65% and the horizontal dimension is smaller by 10% extra space here? compared to the conventional planar log-periodic dipole array antenna. The patches have been included for certain dipoles to get a high and nearly stable gain in the entire operating frequency range. The fabricated PPLPMDA antenna is tested in terms of S-parameters, far-field radiation performance, IEMI sensing, etc., and witnessed good agreement between simulation and measurement results. The measurements show that the PPLPMDA antenna has an average gain of <tex-math notation="LaTeX">4.25 ± 1.25\ dB </tex-math>, a reflection coefficient <tex-math notation="LaTeX">| S₁₁ |≤ 10\ dB </tex-math>, and a stable radiation pattern. Compared to the existing designs, the proposed PPLPMDA antenna has a compact nature without sacrificing the far-field performance, which makes it more suitable for system-level integration as a nonpowered passive sensor to detect IEMI signals.