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A subwavelength metamaterial consisting of array of aluminium conductors is proposed and numerically analyzed using a finite-element method. This material is suggested for a tunable active band-stop filter working in the farinfrared region. A cell of our metamaterial-based structure is composed of a rhombic-shaped aluminium conductor, a rubidium-bromide dielectric, and a graphene sheet deposited on the dielectric in order to achieve tunability. A strong confinement of electromagnetic energy absorbed in the dielectric results in a highly efficient absorption. The suggested structure with the graphene sheet exposed to air can act as a highly sensitive refractive-index sensor (the sensitivity 6.8 μm/RIU). Due to a small size of our structure, it reveals perfect absorption at the far-infrared wavelengths and wide-range absorption tuning (from 23.6 to 38.1 µm). The metamaterials with the above structure can result in perfect absorbers for biomedical sensing.

<span>We present the linearization of an ultra-wideband low noise amplifier (UWB-LNA) operating from 2GHz to 11GHz through combining two linearization methods. The used linearization techniques are the combination of post-distortion cancellation and derivative-superposition linearization methods. The linearized UWB-LNA shows an improved linearity (IIP3) of +12dBm, a minimum noise figure (NF_min.) of 3.6dB, input and output insertion losses (S₁₁ and S₂₂)  below -9dB over the entire working bandwidth, midband gain of 6dB at 5.8GHz, and overall circuit power consumption of 24mW supplied from a 1.5V voltage source. Both UWB-LNA and linearized UWB-LNA designs are verified and simulated with ADS2016.01 software using BSIM3v3 TSMC 180nm CMOS model files. In addition, the linearized UWB-LNA performance is compared with other recent state-of-the-art LNAs.</span>

In this study, the common gate stage of the conventional inductive degeneration cascode LNA operating in 60 GHz V-band for the upcoming Wi-Fi standard, and 802.11ad standard with data rates up to 7 Gbit/sec was linearized by bilateral CMOS resistor. The proposed method linearizes the LNA by 6 dBm with minimum power consumption. The proposed LNA dissipates only 2.05 mW supplied from 1.8 V voltage source and exhibits a minimum noise figure of 6.8 dB in the operating frequency. The LNA, without the proposed linearization technique, exhibited 7 dB gain. The linearized LNA exhibited 3.5 dB gain. The ADS2016.01 with TSMC 180 nm CMOS model files were used to perform the simulation.