Influence of cylindrical bending on performance of mine-used wearable half-mode substrate-integrated cavity antenna

Frequency characteristics, impedance matching and radiation characteristics of mine-used wearable half-mode substrate-integrated cavity antenna under cylindrical bending condition were simulated. The simulation results show that cylindrical bending of the antenna leads to an increase of resonance frequency, but the relative bandwidth of -10 dB is basically unchanged. When radiation aperture is bent, impedance matching of the antenna becomes worse as curvature increases. Cylindrical bending of the antenna results in decrease of forward radiation gain and increase of backward radiation gain. Therefore, in view of application of the antenna under cylindrical bending, cavity size and length or width of conductive bottom should be appropriately increased, and radiation aperture should be kept unbent when selecting placement direction of the antenna.