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Planar nano-diodes fabricated on an AlGaN/GaN heterolayer have been measured, showing capability to detect microwave signals up to 43.5 GHz at room temperature. A single nano-diode with length L=1000 nm and width W=74 nm provides a response of approximately 55 mV DC output for a 0 dBm nominal input power at 1 GHz, with a very small fraction of the RF power reaching effectively the device due to a...
Pulsed and transient measurements performed in planar nanodiodes fabricated on an AlGaN/GaN heterolayer reveal the influence of surface and bulk traps on the I–V characteristic and AC impedance. Rectangular and V-shape diodes of different lengths and widths have been measured. Surface trapping effects become relevant in narrow channels, as the surface to volume ratio of the device is increased, while...
The Square Kilometre Array (SKA) radio-telescope is projected to become a reality in 2020. Nowadays, many research groups are investigating the technologies that will be necessary to build this enormous instrument. The reference design of the SKA establishes that the mid-frequency range (from 300 MHz to 1 GHz) will be covered by planar aperture arrays. FIDA3 is an active array prototype formed by...
Differential amplifiers have been proposed as an efficient solution for the planar aperture arrays in the low frequency band of the SKA project. The characterization of this type of devices is not the typical one, and they need of some specific techniques. On the other hand, the use of antennas matched to a non-50 Omega impedance requires of source-pull techniques for an accurate measurement. In this...
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