Planar Magnetic Devices for Signal Processing in the Microwave and Millimeter Wave Frequency Range

Celiński, Z.; Harward, Ian; Anderson, N. R.; Camley, R. E.

doi:10.1016/b978-0-444-62634-9.00010-2

Cited by 1 publication

(1 citation statement)

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“…Examples of devices tuned using an external bias that is able to change the material response are the ferroelectric ones [1], where electric field modifies the dielectric constant of the material used to implement microwave filter or a phase shifter. Other examples of the same class are devices based on the magnetic properties of materials, like those using magnetic garnets and ferrites [2][3][4], even including some applications with permalloy [5]. Recently, also phase-change materials have been studied for magnetic recording as well as for signal processing [6].…”

Section: Introductionmentioning

confidence: 99%

Amplitude and Phase Tuning of Microwave Signals in Magnetically Biased Permalloy Structures

et al. 2020

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In this paper, a permalloy layer has been employed in the fabrication of a coupled line electromagnetic bandgap (EMBG) device to tune both amplitude and phase. A magnetically biased microwave coplanar configuration manufactured with evaporated permalloy has been measured, and a circuit modelling has been studied to evaluate the measured effects in terms of variable attenuation and phase shift. Starting from a permalloy made by the mixture 80% nickel and 20% iron content, we fabricated an electromagnetic bandgap (EMBG) structure based on a periodic arrangement of single sections of a transmission line with variable impedance, also including a central region with coupled lines. The bandpass characteristics of the EMBG device can be tuned by changing permalloy's permeability through the application of a DC magnetic field H0 (parallel to the plane of the structure). In particular, using a magnetic field up to 3000 Oe, it was possible to change the phase by ca. 45° and the amplitude by ca. 7 dB in the X band.

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