Frequency tunable electromagnetic metamaterial using ferroelectric loaded split rings
Abstract
Measurements of a frequency tunable magnetic metamaterial using metallic split rings loaded with barium strontium titanate thin film capacitors are presented. The resonant frequency of this medium is voltage tunable across a 140MHz band centered at 1.75GHz. S-parameter measurements in a microstrip waveguide reveal that the effective relative permeability of the slab has a roughly Lorentzian shape that reaches minimum values between -2 and -3 for biases from 0to5V. The permeability of the slab can tune between positive and negative values, making it useful in applications requiring a state switchable magnetic permeability.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- March 2008
- DOI:
- 10.1063/1.2898575
- Bibcode:
- 2008JAP...103f6105H
- Keywords:
-
- 77.55.+f;
- 77.80.-e;
- 77.84.Dy;
- 84.32.Tt;
- 75.60.Ej;
- 84.40.Az;
- Dielectric thin films;
- Ferroelectricity and antiferroelectricity;
- Niobates titanates tantalates PZT ceramics etc.;
- Capacitors;
- Magnetization curves hysteresis Barkhausen and related effects;
- Waveguides transmission lines striplines