IEEE Antennas and Wireless Propagation Letters · 2012 · 49 citations · 13 references
EngineeringElectrical EngineeringMaterials ScienceAnalog ElectronicsMicrowave EngineeringSemiconductor DevicesImpedance MatchingMicrowave AntennasMicrowave Integrated CircuitsMicrowave MaterialsMicrowave Passive ComponentsMicrowave Semiconductor DevicesAbsorber MaterialsAnalog Circuit DesignMicrowave Absorbing MaterialsMicrowave AbsorptionMicrowave Integrated Circuit DesignResonant AbsorbersSurface ImpedanceThin-film Absorbers
A novel circuit analog absorber is presented in this letter, which consists of three layers: a complex impedance surface, a dielectric layer containing p-i-n diodes, and a conducting ground plane. The complex impedance surface is a periodic array of unit cells with lumped elements. p-i-n diodes are employed to control the RF signal path to realize different effective thicknesses, which results in different absorbing frequencies. An example is fabricated and tested to demonstrate that the proposed absorber can achieve two switchable operations, one of which covers from 0.85 to 1.88 GHz with a -10-dB reflection coefficient, and the other from 2.66 to 5.23 GHz.
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Equivalent circuit model for arrays of square loops
R.J. Langley, E.A. Parker · Electronics Letters · 1982 · 466 citations