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This paper analyses the noise and gain measurement of microwave differential amplifiers using two passive baluns. A model of the baluns that includes potential losses and unbalances has been considered. This analysis allows to de-embed the actual performance of the differential device from the single-ended measurements of the two-port cascaded system and the baluns. The method has been validated with...
The Square Kilometre Array (SKA) radio-telescope is projected to become a reality in 2020. Nowadays, many research groups are investigating the technologies that will be necessary to build this enormous instrument. The reference design of the SKA establishes that the mid-frequency range (from 300 MHz to 1 GHz) will be covered by planar aperture arrays. FIDA3 is an active array prototype formed by...
Differential amplifiers have been proposed as an efficient solution for the planar aperture arrays in the low frequency band of the SKA project. The characterization of this type of devices is not the typical one, and they need of some specific techniques. On the other hand, the use of antennas matched to a non-50 Omega impedance requires of source-pull techniques for an accurate measurement. In this...
The square kilometre array (SKA) will be a next generation radio telescope that will be formed by millions of antennas and receivers. In a more precise way, planar aperture arrays are projected to be used to cover the low frequency band. This paper is focused on the design of a one square meter array. This sub-tile is formed by active bunny-ear antenna elements in an 8 by 8 dual-polarized configuration...
Scan impedance anomalies are associated to phased arrays. There are different phenomena in order to explain these scan blindnesses produced when the array scans at one frequency and one angle. The most popular technique for eliminating these scan blindnesses is based on the use of electric walls in the grid of the two dimensional array. In this paper we present a dual polarized ultra-wide band array...
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