Design of mine-used frequency-switchable half-mode substrate-integrated cavity antenna

Based on half-mode substrate-integrated cavity antenna, a mine-used frequency-switchable half-mode substrate-integrated cavity antenna was designed considering requirements for underground wireless communication and personnel real-time monitoring. Effect on resonance frequency by adding shorting pin in different positions inside cavity was analyzed. Based on the analysis, capacity of frequency-switching in band of 2.45-3.07 GHz was realized by installing removable screw through several pre-designed holes on the antenna. A prototype of the proposed antenna was fabricated with conductive fabric, conductive threads and leather substrate. The design of the proposed antenna was finally validated by agreement between the simulation and test results.