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.
