Abstract
In this work, a 2-by-2 array of a low-profile EBG ground plane is used as a means of sustaining the radiation performance of a 900-MHz LoRa antenna that could be installed at various construction sites. The proposed semi-circles added mushroom (SAM) structure enables a thin EBG height of 0.02λg on an FR-4 substrate at 900 MHz frequencies. A planar electric meander antenna for the 900-MHz LoRa band is integrated with the proposed 2-by-2 SAM plane. From a simulation and demonstration, it is found that the impedance and radiation properties of the integrated prototype in free space are well maintained with a minimum degradation even when it is placed on a concrete medium.
Highlights
There has been a great effort to realize the concept of an ‘‘Internet of Things’’ (IoT), which is composed of the series of processes of identifying, sensing, networking, and computation [1]–[3]
The LoRa frequency band is still covered with a −6 dB criterion and more importantly, as shown by the dashed lines in Fig. 10b, the resonant frequency is only shifted by 3 MHz even when the antenna is on the concrete surface, for both the simulation and measurement
In this paper, a method for reducing the height of the mushroom electromagnetic band gap (EBG) structure was proposed and a 2-by-2 piece of the array, named semi-circles added mushroom (SAM), was used under a planar meander monopole antenna as a means of minimizing the surrounding electromagnetic effects when the antenna is installed at construction sites
Summary
There has been a great effort to realize the concept of an ‘‘Internet of Things’’ (IoT), which is composed of the series of processes of identifying, sensing, networking, and computation [1]–[3]. We design a reduced-height metal plane showing the EBG characteristic at the 900-MHz-LoRa band on an FR-4 substrate.
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