Adaptive Control of Angular Sensitivity for VHF-Band Nano-Antenna Using CNT Mechanical Resonator

An adaptive control method of angular sensitivity for a VHF-band nano-antenna is presented. This antenna is composed of a single carbon nanotube cantilever immersed in a DC electric field. The behavior of the antenna is analytically described using a singly clamped metallic sphere model and the image charge method. We derive design guidelines for the direction and shape of angular sensitivity; the amplitude of the DC electric field is a key parameter for controlling the sensitivity. The analysis reveals that the most sensitive direction is tunable in the range of -π/2 to π/2. The shape of sensitivity can be manipulated to be omnidirectional or to correspond to a Hertzian-dipolelike antenna. This investigation is useful for adaptive control to suppress interference signals in nanoscale communication systems.