Nathaniel Horner

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The ALMA Band 6 (211-275 GHz) receivers use sideband-separating SIS mixer-preamplifiers with dual 4-12 GHz IF outputs. The sideband-separating mixers are of the phasing type, with the LO driving two component mixers in-phase and the RF signal connected to the mixers through a quadrature hybrid. The IF outputs of the mixers are amplified, then combined in a(More)
  • Research Showcase, Cmu, Alan Theodore, Jenn, Carnegie Mellon University, Alan Jenn +56 others
  • 2015
Acknowledgments First and foremost, I would like to acknowledge my immediate family: my parents Paul and Sherry as well as my older brother Ian. Likely unbeknownst to him, my father was my primary motivation for trying to obtain a PhD as a life goal while growing up. I looked up to his intellect (and still do) as well as his hard work ethic, attributes I(More)
The balanced mixer is fabricated on a 2 x 1 mm quartz substrate which contains an RF quadrature hybrid and two SIS mixers. These components are realized in capacitively-loaded coplanar waveguide, which minimizes stray coupling between adjacent components and coupling to undesired modes in the thick quartz substrate. Signal and LO waveguides are coupled to(More)
This paper describes the design and performance of the initial Band 6 (211-275 GHz) ALMA cartridges. The incoming beam is coupled by 4-K reflecting optics to a scalar horn followed by an orthomode transducer. Each polarization is down-converted in a sideband-separating SIS mixer integrated with a pair of 4-12 GHz IF preamplifiers. Stringent thermal(More)
In the United States, as elsewhere, state and federal governments have considered or implemented a range of policies to create more sustainable energy generation systems in response to concerns over climate change, security of fuel supply, and environmental impacts. These policies include both regulatory instruments such as renewable portfolio standards(More)
Introduction 1 EXECUTIVE SUMMARY This report analyzes two proposed options for increasing natural gas demand and bolstering prices in the state of Pennsylvania: (1) construction of the Allegheny Pipeline to transport gas to the New York market, and (2) increasing penetration of Compressed Natural Gas (CNG) Dual-Fuel (DF) passenger vehicles in the state(More)
While the research into MIMO communications algorithms have reached levels of development that show important wireless systems performance improvements, the development of DSP systems to implement them has limited implementations to the simplest and least performing algorithms. This paper addresses this technological gap by studying how to design DSP(More)
This paper describes the design and performance of the initial Band 6 (211-275 GHz) ALMA cartridges. The incoming beam is coupled by 4-K reflecting optics to a scalar horn followed by an orthomode transducer. Each polarization is down-converted in a sideband-separating SIS mixer integrated with a pair of 4-12 GHz IF preamplifiers. Stringent thermal(More)