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

Abstract

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.

Characterization of thin magnetic materials for high frequency applications

“…This will cause deficit in amount of data for the optimization process. Therefore this state requires asymmetrical coplanar wave guide [23]. A parametrical study concerning central conductor and slots widths (w and s in Fig.…”

Multiband isolator based on a coplanar metaline

“…Microwave ferrite components (isolators or circulators) are thus subject to research aimed at their miniaturization and their integration. Their basic operating principles can be explained by one or more of the following nonreciprocal effects in magnetized ferrites: Faraday rotation [1], gyromagnetic resonance [2], field displacement [3], spin waves, or magnetostatic waves [4].…”

Coplanar High Impedance Wire on Ferrite Substrate: Application to Isolators

“…But for applications such as circulators and isolators, magnetic materials and external magnetic bias field are needed to generate the non-reciprocal behavior. Several isolators based on ferromagnetic resonance, Faraday rotation and/or field displacement were developed in waveguide or in planar technology [10]- [20]. However, the miniaturization and the integration of nonreciprocal components still remain a major challenge for the microwave telecommunication industry.…”

“…To go to more compact and integrated components, coplanar structure seems to be more convenient. A narrow-band isolator has been performed using a non-symmetrical CPW on polarized ferrite substrate [10]. The operating frequency is about 10.6 GHz, the insertion losses are close to 1 dB and the isolation is superior to 20 dB.…”