Polymeric ferrite‐loaded antennas for on‐body communications

Abstract

Wearable antennas are integral part of body area networks (BANs). Antenna design for BAN applications is a challenging task since the antennas have to be small, efficient, and must not be affected by the wearer's body. This makes isolation of antenna a matter of importance. Ferrites form an opaque media for microwave at the 2.4‐GHz ISM band and hence it could be used for the isolation of antenna from surroundings. Thin polymeric ferrite sheets are used to reduce body influence in BAN perspective. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2530–2533, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24669

Retracted: Mechanisms of influence of MM-waves on development physiology of fitosistems

“…The measured magnetic and electric characteristics of these ferrites at 2.4 GHz are given in Table 1. The permeability and permittivity values have been measured using the cavity perturbation method and integrated in the HFSS modelling to design the antennas [3]. Shielding efficiency (SE) is the measure of the capacity of a material to restrict microwaves from propagating through it.…”

“…The body influence on S11 is very small for a 2cm distance between the antenna and the body (phantom with and without ferrite sheet. The frequency bandwidth (-10dB) is 800MHz, the measured efficiency using Wheeler cap method [3] is 96%.…”

Antenna design and channel modeling in the BAN context—part I: antennas

“…This section investigates the influence of the human body on three small antennas which could be easily integrated and printed on fabric to realize wearable structures [17]. These antennas are sensitive to both linear polarizations and have miniaturized ground planes to suit BAN applications at 2.4 GHz.…”

Design and Analysis of Textile Antenna using EBG Structure

“…The SAR can be reduced by using RF Shields, the reduction of SAR depends on the position of RF Shields [7]. Radiation effect can be reduced by using polymeric ferrite sheets and resonant frequency is not influenced by ferrite shield but reduces the SAR value [8]. In [9], the authors proposed reconfigurable textile antenna for ISM band applications.…”