Conference Papers/Presentations
JEM participates in a variety of technical conferences and symposiums. Below please find a list of papers that have been published and presented at several conference proceedings.

September 6-7, 2006: Antenna Systems 2006
Paper Title: Wideband Omni-Directional Loaded Genetic Antennas for Receiving Vertical, Horizontal, Right-Hand and Left-Hand Polarizations
Authors: Derek Linden, PhD, JEM Engineering
Abstract: This presentation will show the practical application of genetic antenna technology and the state-of-the art in the design and production of these antennas.

September 6-7, 2006: Antenna Systems 2006
Paper Title: Low-Cost Phased Array Antenna System—FlexScan
Authors: James Lilly, JEM Engineering
Abstract: A novel, low-cost technology for phased arrays. The FlexScan phased array antenna is based on a patented variable true-time delay beamformer. Key to this beamformer is a very low loss variable delay line (VDL) whose phase velocity can be controlled by very small scale electro-mechanical actuation. The low insertion loss of this VDL eliminates the need for (T/R) modules. The VDLs are embedded in a fractal power divider that forms a single beam in one direction over an ultra-wide band of frequencies. Two-dimensional beam scan control is achieved by using only two analog control signals (corresponding to ±x and ±y) that are applied to beamformer control actuators that are integrated with the power divider circuitry.

October 26, 2005: USAF Test and Evaluation/Science and Technology (T&E/S&T) Program/Spectrum Efficient Technology
Paper Title: Beamformer Antenna for Launch Vehicles, Missiles and Rockets
Authors: James Lilly, JEM Engineering and Daniel A. Mullinix, NASA/GSFC
Abstract: Novel true time delay beamformer uses mechanical delay lines to form a high gain tracking beam from a phased array of patch antennas on a dynamic launch vehicle. Purpose is to increase antenna gain for relay of signals from expendable launch vehicle (ELV) through tracking and data relay satellite system (TDRSS).
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March 29, 2005: IEEE Antenna and Propagation (AP-S) Society Chapter Meeting
Paper Title: Antenna Design with Genetic Algorithms
Author: Derek S. Linden, PhD, JEM Engineering
Abstract: Demands on antenna performance, size, form and cost are increasing as wireless communications and remote sensing become more and more ubiquitous. Genetic algorithms, which mimic biological evolution and adaptation have been found to be very effective at producing counter-intuitive antenna designs that can satisfy challenging, and even competing, specifications. The talk introduced genetic algorithms and provided examples of challenging antenna design problems that have been solved using this technique.
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