Design of a miniaturized planar half elliptical ultra‐wideband dipole using a concaved arm

Abstract

This article presents the miniaturization of a planar half elliptical ultra‐wideband dipole. By simply placing a concaved arm in close proximity to the original structure, a 45% area reduction in terms of electrical wavelength can be achieved. The proposed antenna exhibits a wide measured return loss bandwidth of 2 to 9.9 GHz and omnidirectional radiation patterns across the band. The design features a footprint size of 41.5 × 41.5 mm2 and an electrical size of 0.28λ × 0.28λ at 2 GHz. Compared with some previously reported planar designs, the proposed antenna presents a more compact electrical dimension and better or comparable bandwidth. Critical geometric parameters of the structure, particularly the concaved arm, are investigated to understand the miniaturization and operating mechanism of the design. Satisfactory correlation between the simulation and measurement data is obtained.

Design of a Wideband Single-Layer Reflectarray Antenna Using Slotted Rectangular Patch With Concave Arms

“…In this paper, a novel element comprising single-layer slotted rectangular patch with concave arms is presented for wideband reflectarray antennas. The concave arms, which are also used in a miniaturized ultrawideband antenna design [14], are introduced here to produce an extra resonance for an increased phase response and enhanced bandwidth. By placing a pair of concave arms beside the slotted rectangular patch and optimizing the critical design parameters, the element can offer a rather linear phase response ranging 360 • .…”