Articolo in rivista, 2020, ENG, 10.1109/ACCESS.2020.3031310

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

Aldrigo, M.; Cismaru, A.; Dragoman, M.; Iordanescu, S.; Proietti, E.; Sardi, G. M.; Bartolucci, G.; Marcelli, R.

National Institute for Research and Development in Microtechnologies, IMT, Bucharest, Romania CNR-IMM Roma, Rome, Italy University of Roma Tor Vergata, Rome, Italy

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. 45o and the amplitude by ca. 7 dB in the X band.

IEEE access 8 , pp. 190843–190854

Keywords

Electromagnetic devices, magnetic materials, magnetic films, magnetic properties, microwave magnetics

CNR authors

Proietti Emanuela, Sardi Giovanni Maria, Marcelli Romolo

CNR institutes

IMM – Istituto per la microelettronica e microsistemi