Saab AB

About: Saab AB is a company organization based out in Thun, Switzerland. It is known for research contribution in the topics: Antenna (radio) & Signal. The organization has 862 authors who have published 928 publications receiving 8807 citations. The organization is also known as: Saab AB & Svenska Aeroplan AB.

Thermo-mechanical reliability and performance degradation of a lead-free RF power amplifier with GaN-on-SiC HEMTs

Abstract: RF power amplifier demonstrators containing each one GaN-on-SiC, HEMT, CHZ015A-QEG, from UMS in SMD quad-flat no-leads package (QFN) were subjected to thermal cycles (TC) and power cycles (PC) followed by electrical, thermal and structural evaluation. Two types of solders i.e. Sn 63 Pb 36 Ag 2 and lead-free SnAgCu (SAC305) and two types of TIM materials (NanoTIM and TgonT 805) for PCB attachment to liquid cold plate were tested for thermo-mechanical reliability. Changes in electrical performance of the devices namely reduction of the current saturation value, threshold voltage shift, increase of the leakage current and degradation of the HF performance were observed as a result of an accumulated current stress during PC. No significant changes in the investigated solder or TIM materials were observed.

Decoy material package, a dispenser and a method for dispensing decoy material

Abstract: The present invention relates to a decoy material package (4) and a dispenser (1 ) which package is intended for use in the dispenser (1 ). The package (4) comprises an elongated container portion (13), which is in the form of a strip and which comprises a plurality of depressions (5), which are to be filled with decoy material (16) and a cover portion (12), which is sealed to the container portion (13), when the depressions have been filled with decoy material, and which covers the container portion (13); whereby the decoy material is hermetically stored in the depressions (5) of the package (4). The package (4) also comprises a gripping portion (14) which cooperates with a feeding means (6) comprising gripping means (7) in the decoy material d dispenser (1 ). The present package and d dispenser provide a simple, effective, economical and environmentally friendly package and dispenser for the decoy material.

Method and device for determining distances

Abstract: In determining distances using electro-magnetic waves, in particular when determining short distances in a radar installation, from a transmitter (1) a frequency modulated signal is issued, which can be modulated by a sinusoidal or triangular signal and the modulation of which in addition can have a frequency varying in time. In the receiver part (11) of the installation, in a mixer (9) a received echo signal is mixed with a leak signal (7) from the transmitter side (4). From the obtained spectrum signals are extracted around several different multiples of the modulation frequency by means of coherent detectors (19a, 19b) in different signal processing branches (a, b). After the mixing also a product modulation using a reference signal in the shape of a suitable sine signal can be executed. The signals from the signal processing branches (a, b) are conducted to a device (27), which executes a weighted production of a difference. The difference signal obtains, when using suitable control signals (vref,a, vref,b) to the coherent detectors (19a, 19b), a strongly increasing signal strength, when the installation increases the object, which causes the echo signal. The control signals to the detectors are selected, so that different special linear combinations are selected among tones in the incoming signal, whereby desired distance dependencies can be achieved.

A comparison between quantum and classical noise radar sources

Abstract: We compare the performance of a quantum radar based on two-mode squeezed states with a classical radar system based on correlated thermal noise. With a constraint of equal number of photons $N_S$ transmitted to probe the environment, we find that the quantum setup exhibits an advantage with respect to its classical counterpart of $\sqrt{2}$ in the cross-mode correlations. Amplification of the signal and the idler is considered at different stages of the protocol, showing that no quantum advantage is achievable when a large-enough gain is applied, even when quantum-limited amplifiers are available. We also characterize the minimal type-II error probability decay, given a constraint on the type-I error probability, and find that the optimal decay rate of the type-II error probability in the quantum setup is $\ln(1+1/N_S)$ larger than the optimal classical setup, in the $N_S\ll1$ regime. In addition, we consider the Receiver Operating Characteristic (ROC) curves for the scenario when the idler and the received signal are measured separately, showing that no quantum advantage is present in this case. Our work characterizes the trade-off between quantum correlations and noise in quantum radar systems.

Overview of the MAGNUS project

Abstract: From 2005 to 2009, the European Defense Agency (EDA) supported the KORRIGAN project, aimed at establishing a European supply chain for the manufacturing of GaN HEMT devices and MMICs. This paper describes one follow-up programme, called MAGNUS (“GaN with UMS GH25 process”) fully dedicated to MMICs and module design using the quarter micron GaN on SiC process, provided by United Monolithic Semiconductors (UMS). The MMIC demonstrators are advanced circuits designed by 7 partners from 5 contributing countries. More than 30 circuits have been designed for each of two foundry runs, including HPAs, robust LNAs, mixers, power switches and multifunction MMICs, working at X-band and in wide bands (one octave and more, at frequencies ranging from 2 GHz to 20 GHz). MAGNUS ended in December 2015 with MMICs demonstrating performances at the state-of-the-art using a European GaN Foundry.