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A new structure for improving the efficiency of antennas in the terahertz band is presented. The structure aims for reducing the energy distribution on a high permittivity material by etching a dielectric horn. The structure allows ultra wideband operation when a broadband antenna is used for excitation. The fundamental mode that propagates in the structure is the HE11 mode, which results of a combination...
A focusing system for a 300 GHz radar with two target distances (5 m and 10 m) is proposed, having 1 cm resolution in both cases. The focusing system is based on a gaussian telescope scheme and it has been designed using gaussian beam quasi-optical propagation theory with a homemade Matlab analysis tool. It has been translated into a real focusing system based on two elliptical mirrors and a plane...
In this paper a fast iterative technique is presented for the analysis of large reflectors through the combination of the Method of Moments (MoM) with Physical Optics (PO). The iteration is based on a Krylov approach imposing orthogonality on each step, together with the use of Macro Basis Functions (MBF) on the feed region. The complexity of the problem is reduced by a Nf /P factor with Nf the number...
A submillimeter ultra-wideband Tapered Slot Antenna (TSA) is presented. The operation frequency band goes from 0.6 THz to 2 THz, with symmetric radiation patterns from 0.9 THz to 1.8 THz. Good gaussicity levels are achieved (above 80%) and the substrate width limitation has been overcomed by the use of a dielectric wedge over a Gallium Arsenide wafer, where the photonic excitation is placed. With...
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