A Dual-Resonant Shorted Patch Antenna for Wearable Application in 430 MHz Band

In this communication, a novel approach to expand the bandwidth for the ultra-low profile wearable shorted patch is proposed and fabricated. It introduces dual-resonance to acquire 5.2% bandwidth within 0.358λ×0.358λ×0.011λ dimension at 430 MHz without increasing the structure complexity. By using EVA (ethylene-vinyl acetate) foam and copper gauze as the material, this dual-resonant shorted patch is light, flexible, and rigid enough for wearable application. SAR (special absorption rate) and performance after bending are simulated and analyzed to validate its reliability in wearable condition. The measurement result verifies the design concept, which can provide consistent radiation character, along with acceptable gain and efficiency in the whole working band.