NDLI: Fully planar room-temperature circulator based on magnetized semiconductors

Content Provider	IEEE Xplore Digital Library
Author	Alshannaq, S.S. Rojas, R.G.
Copyright Year	2009
Description	Author affiliation: ElectroScience Lab, Dept. of Electrical and Computer Engineering, The Ohio, State University, 1320 Kinnear RD, Columbus, 43212, USA (Alshannaq, S.S.; Rojas, R.G.)
Abstract	Most nonreciprocal microwave devices use magnetized ferrite materials modeled by a permeability tensor. The performance of such devices starts to degrade above 40 GHz due to the upper limit of the saturation magnetization. Bandwidth and integration into the semiconductor-based MMICs are still issues of concern. The availability of spectrum near the 60–77 GHz range as well as the infrared region has increased the demand for improved performance of devices and systems. Fortunately, advancements in semiconductors technology provide alternative materials for nonreciprocal devices. High mobility semiconductors act like solid-state plasmas, and when exposed to a DC magnetic bias, can be modeled as (gyroelectric) anisotropic material, or magnetoplasma. This gives rise to a permittivity tensor, which might be thought of as the dual to magnetized ferrites. Doped semiconductors like InSb and GaAs are usually employed for this purpose. They can work at higher frequencies; up to THz. Also, the offered bandwidth is huge and well exceeds the available bandwidth of most microwave guiding structures. Being a semiconductor, this material is fully compatible with integration, making it an attractive choice for MMICs applications.
Starting Page	1
Ending Page	4
File Size	1228084
Page Count	4
File Format	PDF
ISBN	9781424436477
ISSN	15223965
DOI	10.1109/APS.2009.5172314
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic semiconductors Magnetic anisotropy Perpendicular magnetic anisotropy Saturation magnetization Slabs Plasma temperature Magnetic materials Insertion loss Magnetic devices Microwave devices
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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