Compact Dual Band and Dual Polarized CPW-Fed Triangular Shaped Wearable Antenna for ISM band Applications

Abstract

ABSTRACT A coexisting compact dual coplanar waveguide (CPW)-fed dual-band and dual-polarized triangular-shaped wearable antenna (TSWA) is proposed for 2.45 GHz and 5.8 GHz ISM (Industrial, Scientific and Medical) frequency bands. The proposed antenna of area 722 mm2 is fabricated on polyimide substrate (thickness of 1.6 mm and relative permittivity of 3.5). The two identical inverted-L-shaped feed stubs are employed orthogonally in wide triangular slot to provide both horizontally and vertically polarized radiations in both ISM bands. An additional Y-shaped copper strip is introduced to isolate the two inverted-L-shaped feed stubs in order to achieve higher isolation in both 2.45 and 5.8 GHz operational frequency bands. The proposed TSWA achieves similar −10 dB impedance bandwidths of 21.7% (2.30 ̶ 2.86 GHz) and 14.26% (5.60 ̶ 6.46 GHz) respectively for dual-polarized radiations along with more than 20 dB isolation in both 2.45 and 5.8 GHz ISM bands. The effect of human loading on performance of proposed TSWA is also studied. The proposed antenna is designed, fabricated, and tested. The simulated results are verified and validated with measured ones and thus, makes it suitable for wearable ISM bands applications.