Textile Bandwidth-Enhanced Coupled-Mode Substrate-Integrated Cavity Antenna with Slot

Abstract

A textile bandwidth-enhanced coupled-mode substrate-integrated cavity antenna with a slot is presented. The original coupled-mode substrate-integrated cavity antenna is of two close resonances for the odd and even coupled modes, and a rectangular slot is added on the top layer to introduce a third resonance. Parameters are optimized to merge the bands of the three resonances to realize a widened −10 dB impedance band to cover the Medical Body Area Network band, 2.45 GHz Industrial Scientific Medical band and Long-Term Evolution Band7. The proposed antenna can operate in a −10 dB impedance band of 2.32–2.69 GHz with a 14.9% fractional bandwidth according to the measurements on a fabricated prototype. Simulation and measurement results illustrate the robustness of the proposed textile antenna in the vicinity of the human body and cylindrical bending conditions. In addition, the simulated specific absorption rate of the antenna radiation in the human body is lower than the IEEE and EN limits.

Review on Substrate Integrated Waveguide Cavity Backed Slot Antennas

“…The size of the antenna needs to be reduced. In [71] to reduce size, a SIW textile antenna inspired by metamaterials is proposed for offbody applications. The antenna consists of two layers of wool felt and conductive fabric Slot configuration exhibits negative order resonance and operates below waveguide cutoff frequency.…”

Design and Analysis of a Quad-Band Antenna for IoT and Wearable RFID Applications

“…Diversifying substrate materials, including textiles, jeans, denim, polyfoam, PET, glass, conductive fabric polymers, felt, polyimide substrates, and cotton fabric, is instrumental in achieving flexibility and conformability. Numerous recent studies have adopted some of these substrates for conventional operating frequencies, such as 2.45 GHz [5][6][7][8]. However, it is noteworthy that certain designs within this frequency band may encounter limitations in data rates, accompanied by increased design complexity in specific cases.…”