Ultra-miniature UHF antenna using magneto-dielectric material

Experimental determination of magnetocrystalline anisotropy constants and saturation magnetostriction constants of NiZn and NiZnCo ferrites intended to be used for antennas miniaturization

“…The magnetic phase of this porous nanostructured material is constituted by nanograins of ferrite. Such low loss materials can be obtained by applying moderate temperature to the material after compaction [21][22][23][24][25][26]. Actually, it is the key to benefit by ferrites properties at higher frequencies that to use them as half-massive -instead of full massive -ceramics.…”

“…Domain wall contribution to the permeability is avoided when the magnetic particles remain small enough to stand in a single domain state, which allows the material to be used at higher frequencies than a bulkier one. The ability of these materials to reduce antenna dimensions in the application frequency range of 400 À862 MHz has been demonstrated [21,26], and small antennas have been realized [11,[22][23][24][25].…”

Frequency Tunable Antenna Using a Magneto-Dielectric Material for DVB-H Application

“…The purpose of this part is to prove that in the case of a 3-D inverted F antenna (IFA), using such kind of materials has same benefits than the ones presented by the literature [13]- [19]. This study is presented in three points: -an attractive design of a 3D IFA has been firstly investigated; -three antenna designs: the same antenna design has been studied without material, with a dielectric material and with a magneto-dielectric material, which has the same refractive index; -a prototype has been manufactured and measured to corroborate the simulations.…”

“…To cover a wide impedance bandwidth while maintaining very small antennas size, the use of magneto-dielectric materials has been reported in many papers [13]- [19]. According to [13]- [16], magneto-dielectric substrates can permit to overcome the input impedance bandwidth limitation for small antennas compared to dielectric ones.…”

Compact magneto-dielectric resonator MIMO antenna for angle diversity

“…In this manner, magneto-dielectric material offers a larger number of parameters of dielectrics to improve the performance and some characteristics of antennas as per the requirements for numerous applications [5]. By using such types of materials the matching and radiation efficiency is improved and it also provides low mutual coupling and a higher rejection level [6][7][8][9][10][11].…”