Abstract
The main issue to tune controlled devices by the application of a DC magnetic field comes up against the high value of the field’s intensity required for their implementation. This work presents an implementation of magneto-dielectric materials (MDM) specifically manufactured for their integration in antenna devices operating in VHF band. The twofold objective is: (i) reduction in antenna size, (ii) frequency tuning of the antenna using a low intensity magnetic control. A notable permeability variation of MDM samples is observed when the symmetry of the lines of the control field, with an intensity less than 10 Oe, is consistent with the one of the structures in the magnetic domains. The MDM allows a miniaturization of 20% of an inverted-F antenna (IFA) antenna structure, and an agility of about 2.5% for a control field of 1.5 Oe.
Highlights
The common use of connected objects these last few years has led to a special need of both electrically small, cost effective and performing antennas
11a).frequencies, The same with a biasing current of. This difference is probably due to model inaccuracy terms of phenomenon is observed in Figure 11b, which shows a frequency shift of 26% on the in antenna’s operation frequencies, with a biasing current of 5A. This difference is probably due to magneto-dielectric material (MDM) model inaccuracy in terms of permittivity and permeability properties, which can be readjusted in the simulator, in order to fit with measurement results
This work has demonstrated the frequency agility of a miniaturized inverted-F antenna (IFA), thanks to a particular loading technique using a specific tunable magneto dielectric material S2
Summary
The common use of connected objects these last few years has led to a special need of both electrically small, cost effective and performing antennas. For applications requiring long-range communications, antenna radiation properties are crucial to achieve a correct link budget This critical issue arises for airborne systems industry, where the need of small antennas at VHF frequencies is justified by a limitation in weight and aerodynamic drag. The required electric voltage is prohibitive for actual applications For this (μr ) both greater than one, MDM has been used these last few years as suitable materials for antenna reason, the implementation of the magnetostrictive properties of ferrites have not been retained in miniaturization [7,8,9,10]. Fabricated antenna, using samples of polycrystalline MDM designed to meet this objective is presented
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