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Antenna with a reactive impedance substrate for mine rescue applications
Author(s) -
Roestorff Martin,
Odendaal Johann W.,
Joubert Johan
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31541
Subject(s) - backplane , bandwidth (computing) , reflection coefficient , monopole antenna , electrical impedance , electrical engineering , acoustics , dipole antenna , planar , antenna (radio) , physics , engineering , computer science , telecommunications , computer graphics (images)
Two electrically small, reactive impedance surface (RIS) backed, antennas are presented that can be used by rescue workers to locate miners in emergency situations in underground mines. One antenna was designed for optimum impedance bandwidth and the other for compact size, with at least 5% impedance bandwidth. At 433 MHz both antennas have maximum gain values above 5 dBi, and both antennas radiate on average at least 10 dB more power in the front hemisphere than in the rear hemisphere, to reduce interaction with the wearer and aid in locating the missing miners. The first antenna, a planar monopole antenna with RIS backplane had a −10 dB reflection coefficient bandwidth of 25.1%, and a form factor of 0.4 λ 0 by 0.4 λ 0 by 0.069 λ 0 . The second antenna, a loaded planar monopole antenna with RIS backplane had a −10 dB reflection coefficient bandwidth of 5.3%, and a form factor of 0.346 λ 0 by 0. 346 λ 0 by 0.107 λ 0 . Measured and simulated results for the two antennas are presented.