Nearly omni-directional compressed multiband flexible and conformal dipole antenna

摘要

A physically compressed, multiband dipole antenna on a partially opticallytransparent Acrylic sheet flexible substrate material is designed. The multibandoperation is achieved by exploiting the higher-order resonating modes.Due to the use of the flexible substrate, and the less metallic footprint of theradiator, the antenna is flexible and conformal with the nearly omnidirectionalradiation characteristic in one of the principal plane. With an S_(11) = -10 dBimpedance matching criterion, the antenna has a measured 0.76 to 0.85 GHz,2.39 to 2.50 GHz, 2.83 to 2.88 GHz, and 6.09 to 6.5 GHz operating bandwidth.It also has a wide -6 dB measured impedance bandwidth from 0.74 to0.87 GHz, 2.12 to 2.19 GHz, 2.32 to 2.52 GHz, 2.70 to 3.0 GHz, and 5.9 to6.7 GHz. The specific absorption ratio (SAR) of the conformal antenna hasbeen studied for the collar garment applications. The planar and conformalantennas have been fabricated and investigated for the nearly-omnidirectionalradiation pattern. The simulated and measured radiation pattern shows thenearly omnidirectional pattern for a different radius of curvature. The simulatedand measured results are in agreement with each other with a few exceptions.The antenna is suitable for the internet of things (IoT), body areanetworking (BAN), wireless fidelity (Wi-Fi), and smart city applications.