Showing papers by "Daniel J. Hoppe published in 2015"
17 May 2015
TL;DR: In this article, two novel high gain deployable reflectarray antennas to support CubeSat telecommunications are described and compared with other high gain CubeSat antenna technologies, and measured performance results are presented.
Abstract: Two novel high gain deployable reflectarray antennas to support CubeSat telecommunications are described and compared with other high gain CubeSat antenna technologies. The first reflectarray is the Integrated Solar Array and Reflectarray Antenna (ISARA), a K/Ka-band antenna that also incorporates a dense packing of solar cells used to provide electrical power for the spacecraft. The second is an X-band reflectarray designed to provide a bent pipe telecom link. These reflectarrays are ideal for CubeSat applications because they require negligible stowed volume and impose a modest mass increase. The antenna designs and measured performance results are presented.
78 citations
19 Jul 2015
TL;DR: The Integrated Solar Array and Reflectarray Antenna (ISARA) is a new deployable antenna designed to fit into a standard CubeSat bus that does not occupy payload volume, provides spacecraft prime power and imposes only a modest impact on overall mass.
Abstract: The Integrated Solar Array and Reflectarray Antenna (ISARA) is a new deployable antenna designed to fit into a standard CubeSat bus. It does not occupy payload volume, provides spacecraft prime power and imposes only a modest impact on overall mass. Measured data indicates that the 3 panel configuration achieves 33.5 dB gain at 26 GHz. Measured radiation patterns are in good agreement with calculations.
44 citations
01 Jan 2015
TL;DR: Two novel high gain deployable retlectarray antennas to support CubeSat telecommunicatio ns are described and compared with other high gain CubeSat antenna technologies.
Abstract: Two novel high gain deployable retlectarray antennas to support CubeSat telecommunicatio ns are described and compared with other high gain CubeSat antenna technologies. The first retlectarray is the Integrated Solar Array and Retlectarray Antenna (ISARA), a KIKa-band antenna that also incorporates a dense packing of solar cells used to provide electrical power for the spacecraft. The second is an X-band retlectarray designed to provide a bent pipe telecom link. These retlectarrays are ideal for CubeSat applications because they require negligible stowed and impose a modest mass increase. The antenna designs and measured performance results are presented. Index Terms -Antenna, retlectarray, telecommunicatio ns, CubeSat, solar array
1 citations
01 Aug 2015
TL;DR: In this article, the authors developed a precision pulsar timing backend for the NASA Deep Space Network (DSN), which will allow the use of short gaps in tracking schedules to time pulses from an ensemble of MSPs.
Abstract: Abstract Millisecond pulsars (MSPs) are a class of radio pulsars with extremely stable rotation. Their excellent timing stability can be used to study a wide variety of astrophysical phenomena. In particular, a large sample of these pulsars can be used to detect low-frequency gravitational waves. We have developed a precision pulsar timing backend for the NASA Deep Space Network (DSN), which will allow the use of short gaps in tracking schedules to time pulses from an ensemble of MSPs. The DSN operates clusters of large dish antennas (up to 70-m in diameter), located roughly equidistant around the Earth, for communication and tracking of deep-space spacecraft. The backend system will be capable of removing entirely the dispersive effects of propagation of radio waves through the interstellar medium in real-time. We will describe our development work, initial results, and prospects for future observations over the next few years.