Dual‐band dual‐mode patch antenna for on–on–off WBAN applications

Abstract

A dual‐band dual‐mode patch antenna for on–on–off wireless body area network (WBAN) applications is proposed. The antenna consists of a half‐circular patch with two shorting posts to generate a TM 41 higher‐order resonant mode and a bottom ground slot to generate additional resonance. To reduce the antenna size without seriously affecting the radiation pattern, the antenna is cut in half and operates in half‐mode. The antenna has a vertical monopole‐like radiation pattern in the 2.45 GHz industrial, scientific and medical (ISM) band and a horizontal monopole‐like radiation pattern in the 5.8 GHz ISM band. To evaluate the body effect, both 2.45 and 5.8 GHz muscle‐equivalent phantoms were used. The overall dimensions of the proposed antenna is 30.5 × 62 × 3.15 mm.