Showing papers on "L band published in 1973"

Satellite-Aircraft Multipath and Ranging Experiment Results at L Band

Abstract: Results of a flight test program involving a KC-135 jet airplane, the synchronous ATS-5 L -band satellite, and a ground station are presented. Tests included over-ocean multipath measurements and one-way tone ranging within the 1545-1655 MHz frequency band. Amplitude characteristics, polarization, power spectral density, and selective fading properties were measured for sea-reflected and composite signal channels. CW tone-ranging performance was determined in both the thermal noise and multipath environments. Comparison of experimental results with theoretical expectation is given.

A 4-GHz Lumped-Element Circulator (Short Papers)

Abstract: The successful application of thin-film lumped-element circulators (LEC) at L band has led to the following question: How far can these devices be extended in frequency using our present beam-crossover technology? An exploratory study aimed at building an LEC at approximately 4 GHz was successfully completed. Preliminary tests showed a 20-dB band from 4.2 to 5 GHz with an insertion loss <1 dB (minimum, 0.5 dB). This includes fixture losses, which account for about 0.2 dB. The device has been tuned to operate above 5 GHz, and from the experiments it is concluded that a device of this type could be built at frequencies as high as X band. These devices are very small; at 4 GHz, the circulator junction is a 0.075- in diam.

Development of an L-Band Pulse Compressor Using Surface Waves

Abstract: Projection printing can be used for definition of interdigital electrode patterns with the third harmonic at 1.3 GHz. Tradeoffs in finger geometry, bulk mode suppression, and control of impedance are considered and experimental results are presented.