I Simposio de Postgrado 2023. Ingeniería, ciencias e innovación

I SIMPOSIO 2023 DESIGN AND CHARACTERIZATION OF PARAMETRIC AMPLIFIERS BASED ON ARTIFICIAL CPW LINES ABSTRACT To understand the origin of the celestial objects and their evolution, a variety of telescopes have been developed during the years. They can be classified, loosely, in optical, gamma-ray, X-ray, gravitational-wave and radio telescopes. Particularly, radio telescopes are used to receive the radio waves from astronomical sources in the sky. However, one of the receivers’ main problems is the noise. It obscures part of the desired signal, and therefore makes it difficult to analyse. From Friis noise law, it is stated that the noise temperature of a system of three stages is given by Teq = T1 + T2 G1 + T3 G1G2 , (1.1) where if Gi ≥ 1, the first stage generates the highest noise contribution. Therefore, a low noise and high gain is required as the first stage of the receiver. To meet the requirement, researchers have developed a myriad of low-noise amplifiers (LNA) to minimize the noise. For instance, the High Electron-Mobility- Transistor (HEMT) has been especially useful in astronomy. Nonetheless, for applications at frequencies above 120 GHz, the noise contribution is significant. During the last decades, new technologies are being studied, such as the superconducting parametric amplifiers.These amplifiers are potential candidates to be used as RF and IF amplifiers, given that they promise quantum limited noise conditions at high frequencies. In my thesis I present the design and measurement of a particular type superconducting parametric amplifier that uses the non- linearity of the kinetic inductance of the superconductor and artificial coplanar waveguides transmission lines to obtain the desire Bloch impedance. The characterization of these devices was performed in the Observatorio Astronómico Nacional Cerro Calán, located in Las Condes, Santiago, Chile. 1 Departamento de ingeniería eléctrica, Universidad de Chile, Santiago, Chile 2 National Radio Astronomy Observatory, Charlotesville, Virginia, United States *Email: daniel.valenzuela@ug.uchile.cl Daniel Valenzuela Henriquez 1* , Fausto Mena Mena 2