Switchable beam generation in a reflectarray antenna using rotman lens and combline array feed for IoT
Springer Science and Business Media LLC - Trang 1-7 - 2023
Tóm tắt
This paper presents the development of a beam-steerable reflectarray designed for IoT applications in the 5 GHz (WiFi) frequency range. The proposed reflectarray incorporates a combination of a Rotman lens and a combline series-fed array as the feed source, resulting in a planar structure capable of beam steering. By exciting the Rotman lens port, the combline array emits a beam in a specific direction. The reflected beam is then efficiently redirected by the reflectarray towards the desired direction, achieving high gain. The reflectarray system, utilizing a Rotman lens-based combline array as the feed source, enables the generation of four switchable beams directed at angles of
$$-10^{\circ }$$
,
$$-20^{\circ }$$
,
$$-28^{\circ }$$
, and
$$-45^{\circ }$$
. Prototypes of the reflectarray, Rotman lens, and combline array were fabricated separately using low-cost FR4 substrate with dimensions of
$$100 \times 100 \times 1.6$$
mm
$$^3$$
,
$$120 \times 150 \times 1.6$$
mm
$$^3$$
and
$$120 \times 150 \times 1.6$$
mm
$$^3$$
, respectively. The reflectarray antenna with a planar feed source exhibits a gain of 18 dBi at 5 GHz. The results from both the simulated and measured data show strong agreement, emphasizing the antenna’s cost-effectiveness, ease of fabrication, and simplicity, which make it highly suitable for IoT applications.
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