Multi-Band Negative Refractive Index in Ferrite-Based Metamaterials

Abstract

Abstract-A multi-band ferrite-based metamaterial has been investigated by experiments and simulations. The negative permeability is realized around the ferromagnetic resonance (FMR) frequency which can be influenced by the saturation magnetization 4πM s of the ferrites. Due to having multiple negative permeability frequency regions around the multiple FMR frequencies, the metamaterials consisting of metallic wires and ferrite rods with various 4πM s possess several passbands in the transmission spectra. The microwave transmission properties of the ferrite-based metamaterials can be not only tuned by the applied magnetic field, but also adjusted by the 4πM s of the ferrite rods. A good agreement between experimental and simulated results is demonstrated, which confirms that such a ferrite-based metamaterial possesses a tunable multi-band behavior. This approach opens a new way for designing multi-band metamaterials.

Magnetically tunable broadband transmission through a single small aperture

“…The measurement system composed of a vector network analyzer (N5230C, Agilent Technologies, USA) and an electromagnet was shown in Ref. 33 . The samples were placed in the X-band rectangular waveguides (22.86 × 10.16 mm 2 ) and the waveguides were put in the middle of two magnets.…”

Electromagnetic Filters Based on a Single Negative Photonic Comb-Like Structure

“…Left-handed material (LHM), in which the electric permittivity ε and magnetic permeability μ are simultaneously negative at certain frequencies, has attracted tremendous attention in scientific and engineering communities [1][2][3]. These materials provide numerous unusual properties and phenomena because of their special interaction with incident radiation, which are applied to some important fields [4][5][6][7][8][9].…”

Magnetically tunable wideband microwave filter using ferrite-based metamaterials

“…In previous work, our group experimentally and numerically studied the electromagnetic properties of the metamaterials consisting of metallic wires and ferrite rods with various 4pM s , and obtained negative effective permeability in magnetic resonance mode. 20 In this work, we demonstrate a magnetically tunable wideband microwave filter using ferrite-based metamaterials. The microwave transmission properties of the ferrite-based metamaterials can be influenced by the saturation magnetization 4pM s of the ferrite rods.…”

“…The details of the microwave measurement system were described in elsewhere. 20 As shown in Figure 1, the propagation of the incident electromagnetic wave was along the y axis, and the electric field and magnetic field were along the z and x axes, respectively. The bias magnetic field provided by the electromagnets was applied in the z direction, which can be adjusted by input current.…”