Applying QMSIW technique in textile for compact wearable design and high body-antenna isolation

The Quarter-Mode Substrate Integrated Waveguide technology is applied in textile materials to obtain an antenna small in dimensions, simple in design, and with excellent body-antenna isolation. The design evolution is presented, and a prototype is fabricated and validated. Measured on-body bandwidth of 5.1% and gain of 4.2 dBi are achieved. Due to the good shielding a very low Specific Absorption Rate of 0.45 mW/g, averaged over 1 g of tissue, for 500 mW input power is obtained.