Abstract
This paper presents a miniaturized and electrically tunable band-stop frequency selective surface (FSS) with magneto-dielectric engineered substrate which has high and electrically tunable effective permeability. The perspective magneto-dielectric substrate is implemented with multiple layers of 100 nm thick patterned Permalloy (Py) thin film embedded in Roger RT/Duriod 5880 substrate, and each Py thin film layer consists of an array of 15μm×20μm Py patterns with 10 μm gaps among them to suppress the magnetic loss. The tunability of effective permeability for the proposed substrate is achieved by the static magnetic field produced from the applied DC current through the patterned gold bias lines beneath Py patterns. The engineered substrate has been implemented and studied, results show that the substrate embedded with a single layer of patterned Py has an equivalent permeability of 1.14 with tunability of 3.3%, and the substrate embedded with ten layers of patterned Py has an increased equivalent permeability of 2.398 and tunability of 15.8%. A magnetic FSS is designed on the implemented engineered substrate to demonstrate the efficacy of miniaturization and tunability. Compared to non-magnetic FSS on normal dielectric substrate, the size of the designed FSS has been reduced by 16.02%, and the operating frequency of the proposed FSS is continuously tunable from 2.450GHz to 2.672GHz with DC current.
Highlights
Magneto-dielectric substrate implemented with a single layer of Permalloy (Ni80Fe20) thin film has been studied,10 which has an increased and tunable permeability with DC current, and the ferromagnetic resonance (FMR) frequency of Py is improved by patterning ferromagnetic film with selectively aspect ratio and composition of magneto-dielectric materials
To characterize the frequency tunability performance of the proposed engineered substrate, a patch antenna is first measured on an engineered substrate with a single layer embedded patterned Py thin film
To validate the efficacy of designing electrically tunable miniaturized frequency selective surface (FSS) with the proposed substrate, a regular FSS with the unit cell size of 0.285λ0×0.285λ0 is implemented on a Roger RT/Duriod 5880 substrate embedded with ten-layer of 100 nm Py thin films, where λ0 is the free space wavelength at the operating frequency (2.45GHz)
Summary
Frequency selective surfaces (FSSs) which are usually twodimensional (2-D) infinite arrays, acting as spatial filters for the incident electromagnetic waves, have been widely investigated over the past decades.1,2 In recent years, tunable FSSs attracted great interest wide applications such as tunable filters in multiband reflector antennas, tunable radar absorbers, and radomes.3 Many approaches have been utilized to generate a dynamic frequency behavior: mechanically tunable surface with a changing shape,4 magnetically tunable surface with biasing magnetic field,5 and electrically tunable surface with a tuning voltage.6 the mechanically and magnetically tunable FSSs suffer from several disadvantages, i.e., low tuning speed, high loss, and complicated design, it is critical to study electrically tunable FSSs due to their advantages of small size, high tuning speed, and low cost.In addition, with high and tunable effective permeability, magneto-dielectric materials provide more flexibility in the design of high-performance reconfigurable RF components.7 many efforts have been spent to develop various magneto-dielectric substrates, such as applying artificial magnetic conductor layers,8 building metamaterials with embedded resonant circuits,9 etc., these approaches still suffer from the issue of either high magnetic loss or bulk substrate. A high performance electrically tunable and miniaturized FSS is developed on a magneto-dielectric engineered substrate implemented with multiple layers of patterned Py thin scitation.org/journal/adv film embedded on a Roger RT/Duriod 5880 substrate.
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