Antti V. Räisänen

TL;DR: In this paper, simple analytical formulas are introduced for the grid impedance of electrically dense arrays of square patches and for the surface impedance of high-impedance surfaces based on the dense array of metal strips or square patches over ground planes.

TL;DR: The RadioAstron project as mentioned in this paper is targeted at systematic studies of compact radio-emitting sources and their dynamics, including supermassive black holes, accretion disks, and relativistic jets in active galactic nuclei.

TL;DR: A general survey of the principles of radio astronomy receivers is presented in this paper, where a total power receiver is analyzed as a basic radio telescope receiver and the results are used to obtain the performance of other receiver types such as the Dicke receiver, Graham's receiver, correlation receiver, and phase switching receiver.

TL;DR: The Submillimetre and Millimetre Radiometer (SMR) is the main instrument on the Swedish, Canadian, Finnish and French spacecraft Odin this article, which consists of a 1.1 metre diameter telescope with four tuneable heterodyne receivers covering the ranges 486-504 GHz and 541-581 GHz, and one fixed at 118.75 GHz together with backends that provide spectral resolution from 150 kHz to 1 MHz.

TL;DR: Theory and tools for analysis and design of millimeter-and submillimeter-wave multipliers are discussed in this paper, where the Schottky diode model at sub-millimeter frequencies, use of Schotty multiplier chains versus direct higher-order multipliers, and the effect of cooling on Schottkey diode multipliers were discussed.