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The microwave vacuum electronics is regarded to make sense only if producing sufficiently high powers at sufficiently high frequencies. And if intense microwave flows are produced, they may be transmitted only with oversized waveguides or mirror lines, such configurations being equipped with relevant miltiplexers, filters, duplexers and other components of quasi-optical types.
The recent frequency allocations for space-borne radars in P band (432–438 MHz) have aroused the interest of the scientific community. Possible applications for radars operating in this frequency band range from ice sounding to biomass monitoring. Due to the low operational frequencies and accordingly long wavelengths, the required surface for a P-band radar antenna is in the order of 60 or more square...
The RT22 CrAO radio telescope antenna has been observed with a C-band Synthetic Aperture Radar (SAR) for the purpose of deriving scattering properties and pointing information. Space-based radars benefit from accurate calibration targets and for the lower frequency bands such targets can be rather large in physical sense in order to derive level information. Active transponders are used. A large reflector...
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