Ettore Bartoli
Acceleration of Measurement of Array Antennas Using Inverse Source Techniques and Information on a Single Radiating Element.
Rel. Giuseppe Vecchi. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Elettronica (Electronic Engineering), 2022

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Abstract: 
In most current professional indoor antenna measurement systems, the farfield distance is often too large for a practical shielded and anechoic chamber; hence, the measurement is done in the near field region, and the collected data computationally processed to yield the desired far field pattern; this process is called the "NearField to FarField transformation". The cost of a measurement is proportional to the number of samples to be measured; the minimum number of necessary samples is ruled by a result equivalent to the sampling theorem for signals, and usually called the Nyquist limit. In this work, the number of necessary nearfield samples is reduced beyond the Nyquist limit by adding information on the geometry of the antenna under test (AUT), and by simulations of parts of the AUT. This endeavor is made specific for an array antenna, composed of several (nearly) identical antennas interconnected by a network call beamforming network. The approach is based on the equivalence theorem, and a technique called inverse source; the latter yields the fields on a given source from field samples measured outwards. The onsurface fields on individual antennas (called equivalent currents) are used as basic building blocks to describe the farfield radiation. The relative reconstruction error with respect to the reference and different methods are discussed. 

Relators:  Giuseppe Vecchi 
Academic year:  2021/22 
Publication type:  Electronic 
Number of Pages:  80 
Subjects:  
Corso di laurea:  Corso di laurea magistrale in Ingegneria Elettronica (Electronic Engineering) 
Classe di laurea:  New organization > Master science > LM29  ELECTRONIC ENGINEERING 
Aziende collaboratrici:  FONDAZIONE LINKS 
URI:  http://webthesis.biblio.polito.it/id/eprint/23594 
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