Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

Many aspects of chip scale package (CSP) technology, with focus on assembly reliability characteristics, are being investigated
by the JPL-led consortia. Three types of test vehicles were considered for evaluation and currently two configurations have
been built to optimize attachment processes. These test vehicles use numerous package types. to understand potential failure
mechanisms of the packages, particularly solder ball attachment, the grid CSPs were subjected to environmental exposure. Package
I/Os ranged from 40 to nearly 300. This paper presents both as assembled, up to 1, 000 hours of isothermal aging shear test
results and photo micrographs, and tensile test results before and after 1,500 cycles in the range of -30/100 C for CSPs. Results
will be compared to BGAs with the same the same isothermal aging environmental exposures.
Author
Packages; Reliability; Isothermal Processes; Aging (Materials)
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COMMUNICATIONS AND RADAR
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20000061969 DYNACS Engineering Co., Inc., Brook Park, OH USA
Suspended Rectangular/Circular Patch Antennas with Electromagnetically Coupled Inverted Microstrip Feed for Dual
Polarization/Frequency
Simons, Rainee N., DYNACS Engineering Co., Inc., USA; [2000]; 4p; In English; Antennas and Propagation, 16-21 Jul. 2000,
Salt Lake City, UT, USA; Sponsored by Institute of Electrical and Electronics Engineers, USA
Contract(s)/Grant(s): NAS3-98008; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche
The paper demonstrates suspended rectangular and circular patch antennas with electromagnetically coupled inverted microstrip
feed for linear as well as dual linear polarization/frequency applications. The measured results include the return loss and
the impedance bandwidth of the antennas.
Author
Performance Tests; Dipole Antennas; Linear Polarization; Frequencies; Electromagnetic Coupling
20000062467 NASA Glenn Research Center, Cleveland, OH USA
Internet Technologies for Space-Based Communications: State of the Art and Challenges
Bhasin, K., NASA Glenn Research Center, USA; DePaula, R., NASA, USA; Edwards, C., Jet Propulsion Lab., California Inst.
of Tech., USA; [2000]; 12p; In English; 18th; Communication Satellite Systems, 10-14 Apr. 2000, Oakland, CA, USA; Sponsored
by American Inst. of Aeronautics and Astronautics, USA
Contract(s)/Grant(s): RTOP 632-6F-0C
Report No.(s): AIAA Paper 2000-1170; Copyright Waived; Avail: CASI; A03, Hardcopy; A01, Microfiche
The Internet is rapidly changing the ways we communicate information around the globe today. The desire to provide Internet-based
services to anyone, anywhere, anytime has brought satellite communications to the forefront to become an integral part
of the Internet. In spite of the distances involved, satellite links are proving to be capable of providing Internet services based on
Internet protocol (TCP/IP) stack. This development has led to the question particularly at NASA; can satellites and other space
platforms become an Internet-node in space? This will allow the direct transfer of information directly from space to the users
on Earth and even be able to control the spacecraft and its instruments. NASA even wants to extend the near earth space Internet
to deep space applications where scientists and the public here on Earth may view space exploration in real time via the Internet.
NASA’s future solar system exploration will involve intensive in situ investigations of planets, moons, asteroids, and comets.
While past missions typically involved a single fly-by or orbiting science spacecraft, future missions will begin to use fleets of
small, highly intelligent robotic vehicles to carry out collaborative investigations. The resulting multi-spacecraft topologies will
effectively create a wide area network spanning the solar system. However, this will require significant development in Internet
technologies for space use. This paper provides the status’of the Internet for near earth applications and the potential extension
of the Internet for use in deep space planetary exploration. The paper will discuss the overall challenges of implementing the space
Internet and how the space Internet will integrate into the complex terrestrial systems those forms the Internet of today in a hybrid
set of networks. Internet. We envision extending to the deep space environment such Internet concepts as a well-designed layered
architecture. This effort will require an ability to develop and infuse new physical layer technology to increase network bandwidth
at very low-bit error rates. In addition, we identify network technologies such as routers and switches needed to maintain standard
application layer interfaces, while providing low-cost, efficient, modular networking solutions. We will describe the overall archi-