A Dual-Axis Wide-Beam Microstrip Patch Antenna Using Linear Parasitic Line Elements

This study presents a low-profile dual-axis wide-beam patch antenna. The antenna has a multi-layer structure that includes a microstrip patch antenna and four parasitic microstrip linear line elements. In this study, the effect of parasitic linear-line elements on the radiation pattern of a patch antenna was investigated. This demonstrates that the half-power beamwidth (HPBW) of the E- and H-planes and the gain of the patch antenna can be controlled with the optimum length and location of the parasitic elements. Eventually, this paper proposes a structure that widens both E- and H-plane beams using two pairs of parasitic linear line elements. One pair of parasitic elements acts as a reflector to widen the E-plane HPBW, whereas the other pair acts as a director to widen the H-plane HPBW. A 5.8-GHz band prototype antenna was fabricated to experimentally demonstrate the concept. The measured results confirmed the concept, with good agreement with the simulation. The measured results showed that the E- and H-plane HPBW extended to 155° (176%) and 142° (177.5%), respectively.