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A transparent broadband absorber consisting of two periodic graphene resistive patterns separated by dielectric layers is investigated in the paper. The proposed absorber achieves 95% absorption from 39.2 GHz to 200 GHz with 134% fractional bandwidth, due to the multiple resonances provided by periodic patterns and tunability of graphene surface conductivity. Furthermore, the absorber shows relatively...
In this paper, the carbon-based interconnects such as the horizontal multilayer graphene (MLG) interconnects and the vertical carbon nanotube through-silicon vias (CNT TSV) are investigated. Based on the equivalent circuit model, the electrical performance of these carbon-based interconnects are studied. Furthermore, by combining them, one novel carbon-based 3-D interconnect is presented and studied...
A free-standing magnetically biased graphene patch frequency selective surface (FSS) is modelled in this paper. Its transmission coefficients of co- and cross-polarizations can be obtained with an equivalent tensorial surface conductivity. Then, the rotation angle for normal incidence is explored with different values of biasing magnetic field B0. The maximum rotation angle provided by the magnetically...
Modelling of a pair of annular TSVs is performed in this paper. A set of equivalent lumped-element circuit models for two annular TSV interconnects is proposed, with MOS capacitance effects treated appropriately. The method for characterizing its frequency- and temperature-dependent RLCG parameters is proposed, including its effective capacitance and conductance. The characteristic impedance and insertion...
Dual-band rat-race couplers are implemented with double-sided parallel-strip line to provide arbitrary power divisions. Both the uniform-impedance and stepped-impedance cases are explored, and design equations are derived for the two cases. With our method, the rat-race coupler can be quickly developed to satisfy the design specifications. By using phase inverter, arms with arbitrary electrical lengths...
A complete MIMO beamforming system model with mutual coupling and matching network is proposed to cope with frequency-selective fading channels. The overall system transfer matrix is derived using Z-parameter method. The transmit and receive weight vectors are iteratively determined using a MIMO beamforming scheme. Performance of the MIMO system with various antenna matching methods is studied in...
An improved eigenmode expansion method (EEM) is proposed for analyzing power/ground plane pairs in high-speed printed circuit boards (PCB). We notice that the EEM is only applicable for regular structures in a PCB, such as rectangular and circular geometries, and it costs much computational time. Therefore, asymptotic waveform evaluation (AWE) technique and inverted composition method are combined...
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