RF & Microwave Electronics

Keysight Technologies Engineering Education and Research Resources DVD 2016

Keysight is enabling the next generation of engineers to tackle and solve the toughest electronic design and test challenges. With 200 new items in areas relating to education and research (Software Design & Simulation Solutions; Communications Technology; Test & Measurement Science; Nanotechnology & Material Measurement; Power, Energy & Automotive; and Classroom Applications), it includes application notes, white papers, case studies, videos, webcasts, and details on various Keysight solutions. Order your DVD today!    

Posted in: White Papers, Electronics & Computers, RF & Microwave Electronics, Test & Measurement

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High-Data-Rate Platform to Capture and Analyze Raw Baseband Clock/Data

NASA’s Jet Propulsion Laboratory, Pasadena, California The Space Communications and Navigation (SCaN) Testbed has a need to capture and analyze high-datarate (<2 Mbps required) baseband information sent over RF by the JPL Software-Defined Radio (SDR). An RF4425 front end, coupled with a MicroGate Synclink USB and custom C++ software back end, is being used to answer this need.

Posted in: Briefs, RF & Microwave Electronics

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V-FASTR Radio Transient Classifier

NASA’s Jet Propulsion Laboratory, Pasadena, California The V-FASTR (VLBA Fast Transient Experiment) system was motivated by the desire to monitor the radio sky for interesting transient events. To be confident that no interesting extragalactic event is missed, every VFASTR candidate requires human review and evaluation. Candidates consist of pulsar pulses, spurious correlated radio frequency interference (RFI), and other potentially unknown phenomena. However, the number of candidates generated by V-FASTR each day ranges from zero, to tens, to hundreds, to thousands, depending on the observational target and environmental conditions. On busy days, the volume of candidates exceeds the amount of time available for human review.

Posted in: Briefs, RF & Microwave Electronics

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Wideband, Dual-Polarized, Ultra-Low-Noise Focal Plane Array Feed for Active/Passive Microwave Remote Sensing

Goddard Space Flight Center, Greenbelt, Maryland NASA missions utilize active, passive, or both, microwave sounders with a large reflector antenna as an important component. In most of these applications, design engineers have realized that desirable science requirements (spatial and temporal resolutions) can be met only by compromising between conflicting engineering design parameters. A microwave remote sensor designed to achieve high spatial resolution would result in longer revisit time, yielding low temporal resolution and vice-versa. To overcome these conflicting requirements, the present technology advocates use of a cluster of feed horns arranged in the focal plane of the primary reflector antenna. Each feed horn produces a different footprint with appropriate overlaps covering a wide swath, allowing a high temporal resolution. Each feed horn, since they act independently, is designed to produce high spatial resolution. However, this approach has many disadvantages compared to an antenna system in which the cluster of horn feeds is made to act as a Focal Plane Array (FPA). Furthermore, the current approach does not enable maximization of the antenna gain, or immunity for radio frequency interference (RFI).

Posted in: Briefs, RF & Microwave Electronics

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RF Source Modifications to Improve Performance of an Electronegative Plasma Thruster

Marshall Space Flight Center, Alabama In traditional gridded electrostatic ion thrusters, positively charged ions are generated from a plasma discharge of noble gas propellant and accelerated to provide thrust. A separate electron source, typically a neutralizer cathode that consumes propellant, is required in the propulsion system to neutralize the ion beam after it exits the thruster, thereby maintaining overall charge balance. However, if high-electronegativity propellant gases are used, a plasma discharge can result that consists of both positive and negative ions. Such an electronegative plasma thruster has the ability to generate thrust with a quasi-neutral ion-ion plume, thus allowing for the elimination of the neutralizer cathode subsystem, reduction of propulsion system complexity, and improvement of system lifetime and operational flexibility.

Posted in: Briefs, RF & Microwave Electronics

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Simple Impedance Matched Planar Microwave Blocking Filter

Goddard Space Flight Center, Greenbelt, Maryland Thermal blocking filters find wide use in cryogenic applications ranging from quantum computing to ultra-low-noise detectors. They can be used to provide the environmental isolation between cooled devices and the warmer temperature supporting bias and readout circuitry. In particular, they are effective in rejecting thermal radiation, limiting radio frequency interference, and providing a convenient means of heat sinking or realizing a vacuum feedthrough for signal lines.

Posted in: Briefs, RF & Microwave Electronics

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Microwave Regenerative Sorbent-based Hydrogen Purifier (MRSHP)

Marshall Space Flight Center, Alabama The Microwave Regenerative Sorbent-based Hydrogen Purifier (MRSHP) is a unique microwave power-based technology demonstrator created for the purification of a hydrogen product stream produced by the Plasma Pyrolysis Assembly (PPA). The MRSHP prototype uses 2.45-GHz microwave power to heat a 13x sorbent bed during a vacuum/thermal contaminant desorption step. By utilizing the well-known high-sorbate-loading capability of conventional physical sorbents coupled with microwave dielectric heating phenomenon, this technology is employed as a regenerative filter for a contaminated hydrogen gas stream.

Posted in: Briefs, RF & Microwave Electronics

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