Design of an Electrically Small, Folded Dipole Antenna for Wireless Electromyography Systems

An electrically small, folded dipole antenna is proposed for use in wireless electromyography systems with operation frequencies within the ISM band (2.4 GHz to 2.5 GHz). Using miniaturization techniques, full coverage of ISM band is achieved while keeping an electrical size, kr, of 0.65, a physical diameter under 1 inch, and a 2-dimensional design with no added thickness. The proposed antenna design achieves a -10-dB impedance bandwidth of 0.114 GHz covering from 2.391 GHz to 2.505 GHz and has a fractional bandwidth of 4.65%. This achieves full coverage of all channels presented by the ISM band with a minimum radiation efficiency of 98.9%.