Topic
L band
About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.
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TL;DR: Signal excited-state absorption (ESA) influences the performance of erbium-doped fiber amplifier (EDFA) in the L band as discussed by the authors, and it is shown that reliable data can be obtained through measurement and later used for accurate simulation of amplifier performance.
Abstract: Signal excited-state absorption (ESA) influences the performance of erbium-doped fiber amplifier (EDFA) in the L band. The influence is twofold: 1) ESA is responsible for signal absorption, and thus for noise figure increase in the long wavelength range of the L band and 2) ESA decreases inversion of erbium ions, and as a result, amplifier gain is decreased. Two methods of signal ESA measurement are discussed. It is shown that reliable data can be obtained through measurement and later used for accurate simulation of amplifier performance.
25 citations
TL;DR: A tunable high-Q active inductor with high dynamic range is presented, which can be tunable in a wide frequency range by changing the inductance and resistance values.
Abstract: In this letter, a tunable high-Q active inductor with high dynamic range is presented. The equivalent inductance and resistance values can be tunable in a wide frequency range by changing the compe...
25 citations
01 Sep 1996
TL;DR: In this article, a six-channel, C/A code processing, global positioning system (GPS) receiver with an almost omni-directional patch antenna was used to take measurements over three types of ground to characterize 1.575 GHz specular ground reflections and ground dielectric properties.
Abstract: In personal satellite communications, especially when the line-of-sight is clear, ground specular reflected signals along with direct signals are received by low gain, almost omni-directional subscriber antennas. A six-channel, C/A code processing, global positioning system (GPS) receiver with an almost omni-directional patch antenna was used to take measurements over three types of ground to characterize 1.575 GHz specular ground reflections and ground dielectric properties. Fade measurements were taken over grass, asphalt, and lake water surfaces by placing the antenna in a vertical position at a fixed height from the ground. Electrical characteristics (conductivity and dielectric constant) of these surfaces (grass, asphalt, lake water) were obtained by matching computer simulations to the experimental results.
24 citations
01 May 2005
24 citations
NEC1
TL;DR: In this paper, a state-of-the-art advanced borosilicateglass selfaligned (A-BSA) transistor technology that has a cutoff frequency of 40 GHz at V/sub ce/=1 V was applied.
Abstract: A silicon bipolar divide-by-eight static frequency divider was developed. A state-of-the-art advanced borosilicate-glass self-aligned (A-BSA) transistor technology that has a cutoff frequency of 40 GHz at V/sub ce/=1 V was applied. Optimum circuit and layout designs were carried out for high-speed/low-power operation. The single-ended input realized by an on-chip metal-insulator-metal (MIM) capacitor makes it easy to use in microwave applications. Ultrahigh-speed operation, up to 21 GHz, was realized, with 320-mW power dissipation from a single +5-V supply. The static frequency divider is a suitable prescaler for phase-locked oscillators (PLOs), completely covering microwave frequencies from L band through Ku band (1-18 GHz). >
24 citations