Abstract
This work presents the use of a three-element radiating structure for circularly polarized Low-Power Wide Area Network (LP-WAN) communication with space. The proposed structure has a 72 mm × 72 mm × 12 mm compact size with Right-Handed Circular Polarization (RHCP) and a 120∘ wide beamwidth radiation pattern. Printed on low-cost FR4 Epoxy substrate, a feeding network circuit based on Quasi Lumped Quadrature Coupler (QLQC), it achieves a −0.6 dB insertion loss and a very compact size. The final structure has a 69% total efficiency and a 3.14 dBic realized gain.
Highlights
In the last decade, Low Power Wide Area Network (LPWAN) technology came out as a perfect choice for enabling longer range connections at a lower cost and more efficient power consumption [1].The number of connected objects is expected to reach 41.6 billion in 2025 [2]
Several Internet of Things (IoT) use cases must be deployed in isolated areas without any mobile terrestrial coverage or other forms of connectivity
In order to avoid polarization mismatch losses between the devices and the satellite, which are caused by their dissimilar orientations, circular polarization (CP) is preferred
Summary
Low Power Wide Area Network (LPWAN) technology came out as a perfect choice for enabling longer range connections at a lower cost and more efficient power consumption [1]. On the basis of this idea, several projects are developing an IoT solution that provides a connecting link between the nodes on earth and a constellation of low earth orbit (LEO) CubeSat satellites To deploy such a scenario, a terrestrial antenna with specifications such as a compact size, high efficiency, and low cost are needed [4]. The proposed structures in these references use the low-loss dielectric substrates, which are expensive for industrial application To solve this cost problem, the antenna in [15] is fabricated on FR4-Epoxy, which is a low-cost material. Due to the high-loss substrate, this design provides a −0.6 dBic gain at 915 MHz. In this paper, we propose to study a terrestrial compact antenna for LPWAN space communication on a low-cost substrate. Considering a Low-Earth-Orbit satellite constellation, a wide angle radiation pattern is desired to enable communication with the satellite even at a low-elevation angle
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