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Ultrathin Switchable Microwave Filter Based on Graphene and Slot Array

The theory of ultrathin exchangeable microwave Filter contained of graphene sheet and slot array is given here, we design an ultrathin active filter utilizing graphene as the switchable element, with metal slot arrays enabling a Band-pass feature (Liu et al., 2017). When the Fermi energy is adjusted, RS decreases and graphene act more like a conductive Film which maybe ultimately change the communication between Graphene and metal slot arrays, the filter consists of a typical periodic cross slot Arrays in a metal plate, above which is a large-area monolayer CVD graphene deposited on silicon oxide covered silicon substrate to offer tenability of electromagnetic operation (Liu et al., 2017). To clearly test the underlying mechanism of the proposed filter, the reflect of stages are depicted in Fig. 1.   Its shows that the strong band-pass resonance, attributed to the cross-slot array, occurs at approximately 14.8 GHz in The absence of gate voltages in which graphene is at Dirac point.           

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Fig. 1

Fig. 2 (a)

Fig. 3(b)

 

It is checked in Fig2 (a) that the heavy surface current exists along the edge of cross slot and the electromagnetic response occurs around the slot enabling a passband of transmission spectra while clearly rather lower density of current is observed in Fig. 3 (b) when the Fermi level turns to 1.0eV, which point to the resonance has been seriously low by the change of graphene surface resistance resulting from the application of gate voltages.

It is deserved  to note that for the switchable filter only frequencies near the resonance explain  sharp transmission decrease at EF =1.0eV?explain  an improved  provided by the slot layer in spite  similar work  is not observed in the off-resonant regions. Models have been establish  to explain  the circumstance while  only a single layer graphene (SLG) sheet is utilized without slot arrays The lowering  in transmission of the SLG sheet is far less than that of HS at resonance, which reveals the importance of slot arrays in tenability and demonstrates the particular changing  property of the proposed ultrathin filter at specific  frequency Another case we focus  on is that structured complementary cross-shaped graphene patches (CCGP) substitutes the previous continuous graphene layer (CGL) since smaller area of graphene per unit cell in arranging  may eliminate the transmission waste  due to the material loss. The transmission for this case is displayed in Fig. 4. The same switching property is completed when EF=1.0eV because the conductive complementary graphene patch short out the capacitive response associated with the cross slots. And there is an clearly but not large increase in transmission at resonance, indicating 

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