CPW-Fed Body Worn Monopole Antenna on Magneto-Dielectric Substrate in C-Band

Abstract

Body worn antennas generally face the problem of isolation when operated in close proximity to human body. Use of magneto-dielectric material as substrate for antenna makes the system compact and reduces the influence of body on performance of antenna. In addition, miniaturization of antenna size also takes place. 7 wt.% of nano-sized Ni 0.5 Zn 0.5 Fe 2 O 4 is dispersed as magnetic filler in flexible linear low density polyethylene matrix. Beyond 7 wt.%, the sample stiffens and loses flexibility because of percolation limit of the polymer. Verification of the composite as a potential substrate for a body worn antenna is carried out by fabricating a coplanar waveguide fed simple rectangular monopole antenna, using transmission line model at 6 GHz. Antenna performance is studied by wearing the patch on human wrist. S 11 of −21.78 dB at 5.32 GHz and −10 dB bandwidth of 49.62% is observed. For comparison, an antenna at the same resonant frequency is developed on linear low density polyethylene with magnetic inclusions. The antenna on magneto-dielectric substrate shows better performance than dielectric substrate. The magnetic and dielectric properties of the Nickel Zinc Ferrite-linear low density polyethylene composite magneto-dielectric substrate reduces the influence of the human body which makes the antenna system compact and robust as additional techniques are not required for shielding of human body influence on antenna performance.

Wide CPW-Fed Multiband Wearable Monopole Antenna with Extended Grounds for GSM/WLAN/WiMAX Applications

“…Maximum frequency detuning is calculated at the 1780 MHz band for the without-cloth condition during on-arm performance measurements. Minimum frequency Finally, we compare the proposed antenna with other wearable antennas having single-band [1,2,4,5], dual-band [6][7][8][9][10], tri-band [11,12], and quad-band [13] operations, and the results are listed in Table 7. The single-band wearable antennas in [1,2] have comparatively lower SAR values at 2.4 GHz, but their sizes are larger than those of our proposed antenna.…”

“…In the past few years, many single-, dual-, and multiband wearable antennas have been proposed [1][2][3][4][5][6][7][8][9][10][11][12][13]. In previous works, different methods have been used for designing single-band wearable antennas, such as antennas with an electromagnetic band gap (EBG) structure [1], antennas based on metamaterial structures [2,3], monopole antennas fed by CPW [4], and electrotextile patch antennas [5]. Similarly, dual-band wearable antennas fed by CPW on a polypropylene substrate, polygon-shaped slotted wearable antennas on a jean substrate, wearable antennas using a metasurface, polyimide-based wearable antennas, and dual-mode textile antennas on a polydimethylsiloxane (PDMS) substrate have been reported in [6][7][8][9][10].…”

Microstrip Patch Antenna Miniaturization Using Magneto-Dielectric Substrates for Electromagnetic Energy Harvesting

“…In [2], the magnetodielectric material, Nickel Zinc Ni0.5Zn0.5 Fe2O4, was used for body worn sensor applications on a flexible material. The magnetodielectric composite achieved miniaturization for the rectangular shaped antenna and enhanced its bandwidth.…”

Design of CPW fed multiband antenna for wearable wireless body area network applications

“…Although after bending the antenna with different radius of curvature values a slight shift in resonant frequency is observed still the antenna covers the ISM band but leading to an increased overall thickness of the design. In Reference 17, a CPW fed monopole antenna is designed using Nano‐sized nickel zinc ferrite material as a magneto‐dielectric substrate operating in C‐band region. Since there is no backing material in the design, so it leads to more flexibility and easily mountable on surfaces.…”