Design and integration of dual band textile antenna with high impedance surface

This paper describes self conceived design of new dual band wearable PIFA operating at Wifi bands (2.40 & 5.80GHz). Different radiating elements used in this indigenous design, outcomes dual mode resonance. The considered design approach has quasi omni-directional pattern that leads to significant back radiations resulting high value of Specific Absorption Rate (SAR), usually not desirable in wearable application. To overcome this issue, the antenna is integrated with dual band high impedance surface (HIS). This modular integration results in reduction of back radiations by 4-15dB at operating frequencies. Sequel to reduction in back radiations, SAR has also been reduced at the operating frequencies, while evaluating its design response for on-body environment. In addition to these improvements, antenna gain has been increased by 8-9dBi along with improvement in return loss by 23-27dB at the operating frequencies. CST Microwave Studio has been used for the design and simulations.