Miniature Planar Log Periodic Dipole Array Antenna for IEMI Detection Application

We propose a patch added folded dipole log periodic array (PFDLPA) antenna having dimensions
$\text{30} \times \text{31} \times \text{0.16}$
cm
$^{3}$
that operates in a frequency band of 0.5–2 GHz for detecting intentional electromagnetic interference (IEMI). The patches and the folded dipole structures improve impedance matching and provide a stable gain in the operating frequency band. The PFDLPA antenna is fabricated and tested, and the results from measurements agree well with simulations. From measurements, we see that PFDLPA has an average gain of 5.25
$\pm$
1.25 dB, reflection coefficient
$|S_{11}| \le$
−10 dB, and stable radiation pattern. Also, the lateral dimension of PFDLPA is less than that of conventional log periodic dipole array (LPDA) antenna by 21.52%. We compare PFDLPA with existing state-of-the-art designs and show that PFDLPA antenna is compact and has a better gain than LPDA, which makes it more suitable for system-level integration as a sensor for detecting IEMI signals. The proposed PFDLPA antenna with a signal analyzer demonstrates that the PFDLPA antenna can be used for receiving IEMI signals effectively for the safety of the critical infrastructure.