Electromagnetic study of a ferrite coplanar isolator suitable for integration

Bayard, Bernard; Vincent, Didier; Simovski, Constantin; Noyel, G.

doi:10.1109/tmtt.2003.814312

Cited by 33 publications

(16 citation statements)

References 3 publications

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“…Thin and thick layers of YIG have been used in our Laboratory to study different integrated passive components [3][4][5][6]. While studying these devices, we have encountered several mechanical and electrical problems: cracks, detachment of YIG or Cu films from the substrate, deterioration of Cu films, open or short circuit.…”

Section: Resultsmentioning

confidence: 99%

“…The characterization of these films is of great interests in magneto-optics, microwaves and radiofrequency domains. They are used in our Laboratory for the miniaturization of magnetic devices as planar inductors and transformers [1][2][3] and also for the integration of microwaves passive components like resonators, isolators and circulators [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of annealing in vacuum and in air on magnetic, crystallographic and morphological properties of thin YIG films

Siblini

Khalil

Chatelon

et al. 2013

EPJ Web of Conferences

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Abstract. The Yttrium Iron Garnet (YIG) is chosen by our laboratory for the integration of passive components in the microwaves domain and for the miniaturization of integrated inductors and transformers. Magnetic and morphological characterizations are essential for the development of these components. To fabricate a micro-inductor of solenoid type, we have deposited on an alumina substrate, by RF sputtering, a thin YIG film between two layers of copper. We have also used the photolithography technique in a clean room to obtain the desired pattern of the coil. The YIG films are amorphous after deposition, the annealing at 740°C for 2 hours is necessary for them to be crystallized and to have magnetic properties. To avoid the deterioration of copper layers, the Classical Thermal Annealing (CTA) was replaced by a Vacuum Thermal Annealing (VTA). Before manufacturing the integrated inductor, it is interesting to do the magnetic, crystallographic and morphological characterizations of YIG films after annealing with both techniques of thermal treatment. To check the quality of the prototype, we have done different characterizations: VSM, Kerr effect, XRD, SEM. The results obtained with VTA were better than of CTA comparing them with bulk YIG properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of annealing in vacuum and in air on magnetic, crystallographic and morphological properties of thin YIG films

Siblini

Khalil

Chatelon

et al. 2013

EPJ Web of Conferences

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“…(1) Moreover, coplanar transmission line (or coplanar waveguide CPW) can produce a non-reciprocal effect which has been already studied [6], [7]. The process of making and the interconnections between coplanar structures can make easier.…”

Section: Numerical Studymentioning

confidence: 99%

Design of a new coplanar isolator made from YIG film operating in the X-frequency band

Kirouane

Vincent²,

Vernet³

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. The miniaturization of devices and the increase of operating frequencies are two important issues for communication system development. This requires a high degree of integration, higher performance and lower cost. Isolator is an important non-reciprocal passive component for source protection. In most cases, the non-reciprocal effect is based on field displacement phenomenon induced by a magnetized ferrite material. In this paper we propose a new design of a coplanar isolator based on field displacement, composed of a non symmetrical coplanar transmission line, made from a ferrite layer and ground plane below.Simulations were performed using HFSS software. Measurements were made on a first 1000 µm-thick YIG film sample giving 1 dB of insertion losses and 17 dB isolation and on a second sample made from a 150 µm-thick YIG ferrite sample giving an insertion loss lower than 2 dB. Interesting applications of this isolator structure are considered.

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“…These results proved that all the YIG ferrite substrates covering the Y-junction with three coplanar waveguides contribute to the distinctive nonreciprocal transmission characteristics of Type-A circulators. 4 …”

Section: (B)mentioning

confidence: 99%