Abstract
In this paper, an electronically pattern reconfigurable antenna for Internet of Things (IoT) applications is presented. The antenna consists of 4 wire-patches sharing the same ground plane. This radiating element can switch between four end-fire radiation states in less than 5 us and achieves a 290 MHz frequency bandwidth from 2.25 to 2.54 GHz. The results show that this antenna can realize a peak gain of 3.9 dBi at 2.44 GHz and a front-to-back ratio greater than 6.5 dB. A single low-power, low-insertion loss SP4T switch enables the radiation pattern steering. This approach avoids the use of multiple electronic components in the reconfiguration mechanism, thus accommodating the IoT microcontroller’s limited resource constraints. The antenna structure is compact and printed on two cost-effective FR-4 printed circuit boards (PCBs). Thanks to its high performance, small size, low cost, and low-power characteristics, the proposed structure is suitable for IoT applications.
Highlights
I NTERNET of Things (IoT) provides seamless interoperability between a large variety of low-power wireless devices via the Internet
As demonstrated in [16], the spatial filtering capability given by a pattern reconfigurable antenna with a frontto-back ratio (FBR) approaching 7 dB provides up to 29% of network capacity gain and 13% coverage improvement compared to the standard case in which a legacy omnidirectional antenna is used
A novel pattern reconfigurable antenna suitable for Internet of Things (IoT) applications has been presented in this paper
Summary
I NTERNET of Things (IoT) provides seamless interoperability between a large variety of low-power wireless devices via the Internet. In [15], the proposed antenna achieves beam agility by reconfiguring parasitic striplines with 20 PIN diodes While effective, all these reconfigurable design schemes are based on the use of several electronic components that do not fit the limited energy and computational resources usually available on autonomous IoT nodes. In [16], a 3-D parasitic layer-based antenna changes its geometry using switches, providing reconfigurability of the radiation pattern in both the azimuth and vertical planes. The introduction of control circuits in the antenna structure allows the realization of eight beams in the azimuth plane This solution requires integration between the main steering elements with other discrete components, such as DC blocks or RF bypass components, to efficiently activate the reconfiguration circuit.
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