Design of a Deployable Helix Antenna at L-Band for a 1-Unit CubeSat: From Theoretical Analysis to Flight Model Results.

The 3Cat-4 mission aims at demonstrating the capabilities of a CubeSat to perform Earth Observation (EO) by integrating a combined GNSS-R and Microwave Radiometer payload into a 1-Unit CubeSat. One of the greatest challenges is the design of an antenna that respects the 1-Unit CubeSat envelope while operating at the different frequency bands: Global Positioning System (GPS) L1 and Galileo E1 band (1575 MHz), GPS L2 band (1227 MHz), and the microwave radiometry band (1400-1427 MHz). Moreover, it requires between 8 and 12 dB of directivity depending on the band whilst providing at least 10 dB of front-to-back lobe ratio in L1 and L2 GPS bands.

Primary endoscopic management of esophageal perforation following transesophageal echocardiogram.

A 90-year-old woman sustained a proximal esophageal perforation following transesophageal echocardiography. The perforation originated at the site of a Zenker's diverticulum and resulted in a false passage to the diaphragm. Initial management involved endoscopic placement of drains into the mediastinum in addition to bilateral chest drains and a gastrostomy.