Examinando por Autor "Calatayud Maeso, Jorge"

Mostrando 1 - 2 de 2

Fast Planar Near-Field Measurements of Reduced Angular Pattern Domains
(Institute of Electrical and Electronics Engineers, 2024-07-15) Rodríguez Varela, Fernando; Arboleya, Ana; Fontá, Celia; Martinez-de-Rioja, Eduardo; Calatayud Maeso, Jorge
Emerging 5G and Beyond wireless systems are putting the focus on millimeter-wave (mmW) and sub-THz antenna systems with multiple beams and a large number of elements yielding electrically large and complex radiant systems such as Reflective Intelligent Surfaces (RIS) or Massive MIMO panels. Characterization of those antennas may be unfeasible by means of conventional near-field techniques due to the required sampling schemes and high acquisition times. This work proposes a fast Planar Near-Field (PNF) technique based on sparse acquisitions. Singular Value Decomposition (SVD) techniques are employed to reduce the number of unknowns of the inverse problem and to design a non redundant measurement grid. By restricting the near-field to far-field transformation problem to a reduced domain of the antenna radiation pattern, a time-efficient characterization of the mentioned antennas is achieved. The proposed technique has been validated through numerical an measurement examples demonstrating its potential for fast and robust PNF measurements of narrow beam antenna patterns with large tilt angles
Single-Cut Phaseless Near-Field Measurements Using Two Probes
(Institute of Electrical and Electronics Engineers, 2023-12-03) Rodríguez Varela, Fernando; Calatayud Maeso, Jorge; Sun, Xiaoliang; Galocha Iragüen, Belén; Sierra Castañer, Manuel
Single-cut phaseless measurements enable the testing of antenna devices with no reference channel by measuring and transforming to far-field individual pattern cuts. This typically requires performing two single-cut measurements at different distances which may be infeasible or too time-consuming in some antenna facilities. As an alternative, this communication proposes the use of a two-probe system connected to the same coherent receiver. The relative phase between probes is exploited to retrieve the absolute phase using a state-of-the-art linearized phase retrieval approach. Simulations and measurements are performed to validate the technique which includes an innovative probe-to-probe calibration method