Evaluation of the effect of bending on the resonance frequency of inset-fed rectangular textile patch antenna

Abstract

This paper presents a study on the bending behavior of rectangular textile patch antennas including analytical modeling, full wave simulations, and experimental measurements.In the proposed analytical model, the textile patch antenna was treated as a laminated composite beam. Therefore, after locating the position of neutral axis considering the tensile modulus and the dimensions of each layer, the classic cylindrical cavity model was modified to predict the relation between resonance frequency and bending curvature, taking into account the patch's elongation. Since the presented interdisciplinary analytical approach is associated with a set of simplifying assumptions, a full wave model was also utilized to study this effect. All the simulations were performed in two modes; patches with fixed and elongated dimensions. Finally the results of both models were compared with the experimental measurements and the effects of bending on the resonance frequency of textile patch antennas were discussed in more detail. The obtained results showed that some parameters including the direction of bending, substrate thickness, and mechanical properties of antenna's components can alter the textile patch antenna's behavior under bent conditions.

Research on weld surface notch monitoring based on microstrip antenna sensor array

“…Ke et al [19] introduces three parameters of crack position, length and direction, and proposes a crack identification algorithm based on 'crack flux'. Sanjali et al [20] has made a detailed research on the resonant frequency of microstrip antennas bent on a cylinder. The results show that the mechanical deformation of microstrip antenna will lead to the shift of resonant frequency.…”

Porous textile antenna designs for improved wearability

“…Other than washability, mechanical flexibility of the textile antennas is also desirable, especially for wearable applications. Prior research has been conducted to determine the bending effect of textile patch antennas made with conductive fabric [10][11][12][13][14]. H-plane bending, or width bending, has generally been shown to affect the shifting of resonant frequency and impedance matching in both simulation and experiment [10,11].…”

“…Prior research has been conducted to determine the bending effect of textile patch antennas made with conductive fabric [10][11][12][13][14]. H-plane bending, or width bending, has generally been shown to affect the shifting of resonant frequency and impedance matching in both simulation and experiment [10,11]. E-plane bending, or length bending, has comparatively more effect on shifting the resonant frequency lower as the radius of curvature decreases [12,13].…”

“…E-plane bending, or length bending, has comparatively more effect on shifting the resonant frequency lower as the radius of curvature decreases [12,13]. This shift from length bending has been explained to occur due to the change in effective length and wrinkling from the bending of the microstrip and the compression of the dielectric textile [11,13].…”