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An analytical spectral model to efficiently characterize direct power detectors located on the focal plane of focusing THz systems is presented. The model is obtained by extending a Fourier Optics like representation of the electromagnetic field in the focal plane to the THz domain and combining it with a recently developed equivalent network representation. This analytical model is then use to efficiently...
The design of focal planes of direct detectors for the characterization of radiometric distributed sources in the sub-mm wave regime is a problem of renewed interest for the scientific community. The important question is how to optimize the focal plane sampling or the focal plane feed elements for maximizing the acquisition speed. The key speed limitations for some popular feed solutions have been...
Dielectric covered antennas have been extensible used in microwaves. They are usually designed with dielectric quarter wavelength super-layers or with frequency selective surfaces. The main drawback of these antennas is that their BW is inversely proportional to the directivity. The new geometry proposed here makes use of a silicon lens instead of dielectric super-layer. In this case, the directivity...
This paper briefly discusses some of the RF heterodyne imaging applications and instruments that are being developed and deployed for the THz frequency regime. After more than three decades of academic research the THz equivalent of the IR camera is still confined to proposals. However, as the component technology matures and new instruments emerge, interest in applications has followed. Some of the...
In the present contribution, an ellipsoidal reflector antenna fed by a leaky wave array has been studied for imaging applications at submillimeter waves. The array geometry is easy to manufacture at these frequencies and presents better spill over efficiency and more symmetric patterns than conventional horn arrays. At the present time, two arrays aiming at large and small FD ratios are being manufactured...
Micromesh bolometers have been used in several instruments working in the submillimeter band. The bolometers are usually placed inside a waveguide and consist of a mesh absorber, at a certain distance from a back short. The mesh is made of SiNi whose thermal conductivity is tuned to the incident power and operating temperature. The impedance of the mesh is initially matched to the incoming wave impedance,...
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