Abstract
A high-selectivity band pass filter with controllable attenuation based on graphene nanoplates is proposed in this paper. Graphene with controllable resistance has a good uniform attenuation effect to electric field intensity. The filter utilizes quarter wavelength stepped impedance resonators and mixed electromagnetic coupling to have compact circuits and high performance. The graphene nanoplates are loaded on the microstrip resonator to reduce the electric field intensity, which results in a flat attenuation in the passband. In addition, the filter has two transmission zeros, which lead to a strong selectivity. Finally, a high-selectivity bandpass filter with controllable attenuation is formed. By changing the bias voltage of graphene, a controllable attenuation of 1.64–11.13 dB can be achieved in the working passband centered at 1.36 GHz. In order to validate the concept, the prototype is fabricated and measured. The measurement results are in good agreement with the simulation results. The proposed high-selectivity bandpass filter with controllable attenuation based on graphene nanoplates has widely potential in reconfigurable wireless communication systems and radar systems due to its high integration and versatility.
Highlights
Graphene has attracted much attention due to its light weight, large surface area, excellent optical properties, and electrical properties
Significant advances have been made in the preparation methods of large-scale graphene [1,2,3], promoting its applications in the microwave and low terahertz ranges [4,5,6,7,8,9], such as RF graphene field effect transistor, graphene antenna, and graphene microstrip attenuator
Graphene nanoplates are composed of few-layer graphene and generally have a small area, which often appear in the form of fragments, suspensions, or powders
Summary
Graphene has attracted much attention due to its light weight, large surface area, excellent optical properties, and electrical properties. The filter attenuator merged into one, only reduces the circuit size, and improves the performance of the device. A high-selectivity bandpass filter with controllable attenuation based. A is high-selectivity bandpass filter with controllable attenuation based impedance resonators designed [20]. The graphene nanoplatesnanoplates are loadedare around sistance of graphene nanoplates can alter dynamically when different bias voltages are the cavity resonant cavity to theofinfluence on the electromagnetic field the resonant to analyze theanalyze influence graphene of ongraphene the electromagnetic field disapplied to graphene In this way, the attenuation of the filter passband can be adjusted. A high-selectivity bandpass filter with controllable attenuation based on graphene. Characteristics of graphene nanoplates, such as tunable resistivity, corrosion re.The
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