Low profile offset-fed single arm spiral antenna over an AMC ground plane

An extremely low‐profile offset‐fed curl antenna over an AMC ground

“…The unit cell is designed and tuned to operate at the resonant frequency of 4.5 GHz using the HFSS v10.1 [7]. The geometry of the unit cell and its reflection phase are depicted in Figure 2, where both substrate layers have the same height of 1.5748 mm [5].…”

“…An extensive parametric study was then conducted to determine the spiral parameters to optimize its radiation performance. They are given by α feed = 6π, a = 0.3375 $({{\rm mm} \over {\rm rad}})$ , n = 1.07 turns, and D edge = 1.55 mm [5]. The unit cell parameters were kept constant, as given in Figure 2.…”

“…They can be used in filters or amplifiers, and more importantly, as ground planes in low‐profile antennas. With curl antennas, their applications have also been considered, and low‐profile curl and spiral antennas were developed and studied [1–6].…”