Topic
L band
About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.
Papers published on a yearly basis
Papers
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07 Oct 2011
TL;DR: In this paper, the ground return was measured at L band both for HH and VVπolarizations of radar wave as well as for HV and VH crosspolarizations using log-periodic antennas placed at a 10 m======high mast directed towards a meadow surface.
Abstract: The paper describes experimental L-band ground reflectivity measurement using noise radar demonstrator working as a
scatterometer. The radar ground return is usually described with a scattering coefficient, a quantity that is independent
from the scatterometer system. To calculate the coefficient in a function of incidence angle, range profile values obtained
after range compression were used. In order to improve dynamic range of the measurement, antenna cross-path
interference was removed using lattice filter. The ground return was measured at L band both for HH and VV
polarizations of radar wave as well as for HV and VH crosspolarizations using log-periodic antennas placed at a 10 m
high mast directed towards a meadow surface. In the paper the theoretical considerations, noise radar setup,
measurement campaign and the results are described.
1 citations
14 Sep 2022
TL;DR: In this article , the performance of DRA within the O to L band through simulation technique on MATLAB platform has been observed and observed results have been found by studying the variation in output power and its respective gain with respect to spectral variations in Co-pumping configuration for the same input power value in all channels.
Abstract: Optical Fiber communication can smoothly operate in the wavelength region lie within 1260–1650 nm where transmission loss is minimum. In the present article, performance of Distributed Raman Amplifier (DRA), within above band through simulation technique on MATLAB platform has been observed. Present observations have realized by defining new embedded block sets for multichannel amplification. Observed results have been found by studying the variation in output power and its respective gain of DRA with respect to spectral variations in Co-pumping configuration and for the same input power value in all channels. From above observations, it has been realized that flatness in output power of DRA is comparatively better in C & L-band. Observed gain flatness in E-band is comparatively better than O & S band but inferior to C & L. It is well known that optical communication lying within O to L band is always usable for long haul communication with such a high speed data transmission rate of 100 Gbps and from our present observations, it can be justify that communication link set up in C, L and in next E-band is preferable.
1 citations
01 Oct 1978
TL;DR: In this article, a low loss diplexer with temperature compensated cylindrical dielectric resonators mounted in a circular cut-off waveguide was developed for satellite multibeam arrays.
Abstract: For application in satellite multibeam arrays, a compact low loss diplexer has been developed.' Branch filters using temperature compensated cylindrical dielectric resonators mounted in a circular cut-off waveguide give a mechanically simple and robust construction with excellent on board power handling capability. Techniques for manufacture of composite resonators with LiNbO3 to close tolerances on frequency and temperature coefficient have been developed, and bandpass filters with uniform and temperature invariant properties were fabricated. A special input/output cross-coupling is applied in order to give enhanced rejection in part of the filter stopbands. As part of an ESA (European Space Agency) project concerning a multibeam array model, L-band diplexers having less than 0.5 dB loss in 15 MHz passbands and up to 80 dB rejection in a 15 MHz band 100 MHz from passband centers have been manufactured and tested in a 60°C temperature range.
1 citations