This paper presents a compact tri-band L-shaped antenna designed for underground communication and sensing. The combination of an L-shaped monopole with horizontal branches and a triangular structure enables operation in three industrial, scientific, and medical (ISM) frequency bands: 430 910 MHz, and 2.4 GHz, with relative bandwidth of 52.5%, 39.6%, and 35.8%, respectively. The size of the antenna is 100 $\mathrm{mm} \times 100 \mathrm{~mm}\left(0.13 \lambda_{0} \times 0.13 \lambda_{0}\right)$, making it suitable for deployment in confined underground spaces. The antenna design approach initially entailed creating an L-shaped monopole structure to generate resonance points at 430 MHz and 2.4 GHz. Subsequently, a horizontal branch was added to the right side of the antenna to achieve a resonance point at 910 MHz. Finally, to broaden the bandwidth at the 430 MHz frequency band, a triangular structure was appended to the left side of the L-shaped antenna. Simulations of the antenna operating in soil demonstrate that its radiation can be effectively directed towards the soil, with minimal scattering in the air behind the antenna.
Design of a Compact Tri-band L-Shaped Antenna for Underground Communication and Sensing
23.10.2024
733324 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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