Gps Antenna Configurations for Satellite Launcher

Aerodynamics for Optimal Engine-Integrated Airbreathing Launcher Configurations

An overview of some of the activities in hypersonic airbreathing aerodynamics and propulsion airframe integration is presented for the Space Vehicle Technology Institute. The Institute is a multi-university joint NASA-DoD program that was created as a center for research and education in future launch vehicle technologies. Perhaps more than any other type of flight vehicle, next generation spac...

Antenna Configurations for the ALMA

15.1 NUMBER AND SIZE OF ANTENNA ELEMENTS ............................................................2 15.2 LIMITING CONFIGURATIONS, NUMBER OF CONFIGURATIONS, AND RESOLUTION SCALE FACTOR ......................................................................................................................2 15.2.1 Size of the Most Compact Array........................................................

A Small Printed Quadrifilar Helical Antenna for BGAN/GPS Applications

This paper presents an element of a 2×2-element array antenna for Inmarsat BGAN/GPS applications. The element is an axial mode printed quadrifilar helical antenna that has been integrated with a compact feed network to provide sequential phase rotation for circular polarization (CP) radiation. The novel integrated lumped-element feed network is designed to provide a balanced RF power to the fou...

Antenna Configurations for MIMO In-Building Distributed Antenna Systems

Antenna Configurations for MIMO In-Building Distributed Antenna Systems