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Subsystem Design

Antenna Design & Analysis -  LSI's antenna design skills extend from HF through millimeter waves, and the staff has extensive experience calculating on-platform antenna performance using various numerical electromagnetic 
codes and custom analysis techniques.  The company can provide customers with technical proof-of-concept information for a cylindrical array of notch radiating elements.  The upper left plots illustrate typical H-plane and E-plane responses for a 3:1 bandwidth notch radiating element.  The plots in the upper right corner illustrate synthesized azimuth and elevation patterns.  The bottom two images illustrate the corresponding three dimensional antenna array patterns for S-band and X-band operation.  LSI’s antenna performance modeling and prediction span feed structure design and analysis, in-situ active input impedance characterization, and radiation efficiency and pattern quantification.

Beamformer Technology - LSI’s expertise and experience cover all technical aspects of the sensor system.  With the trend toward multibeam active arrays and multifunction broadband apertures, the front end design becomes an  increasingly critical area of refinement.  LSI follows the development of emerging technologies applicable to beamformer and T/R module design, allowing an objective viewpoint that is industry wide for comprehensive trade studies.  From photonic beamformers and multibeam feeds to standard phased arrays, and from corporate feeds to fully populated active arrays, the company specializes in formulating approaches that address customer requirements.  Shown on the left are some preliminary technology and performance requirement considerations that the company utilized as a basis for formulating a true time delay multibeam network design for a wideband X-band sensor concept.

Hardware Evaluation - The staff at LSI is accomplished in the identification and performance prediction of new and emerging passive and active wideband RF technologies.  The company’s expertise and experience however, are not limited to analytical models.  In special situations, LSI has provided customers with prototype hardware integration, functional testing, and quantitative performance evaluation.  Shown here are test results for a LSI integrated T/R module featuring a tunable wideband (UHF thru L-band), high power transmitter, with a continuously variable RF phase shifter (calibrated to 8-bit precision) and a low noise, high dynamic range receiver.  The results were collected using custom developed control and data collection hardware and software, and illustrate both phase control on transmit and the receive path in-phase (I) and  quadrature (Q) tracking performance.  Also shown is the pulse spectrum demonstrating the instantaneous bandwidth characteristics of the receiver.  The test procedure utilized the receive chain to capture the RF leakage on transmit enabling a highly precise measurement campaign that examined both isolated subsystem performance and closed loop fully integrated T/R module performance.