L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.

The Design of P-L band TR Module for Radar and Wireless Communication Systems

Abstract: TR modules directly influences the performance of the detection effect of radar system. This paper implements P-L band TR module with the characteristics of miniaturization, high power, high density for low band of active phased array development.

Plural band receiver

Abstract: PROBLEM TO BE SOLVED: To provide a simple plural band receiver which does not use a switch and whose characteristic is good by providing a band pass filter, where only a first frequency band is made to pass through and a band removal filter which removes only the first frequency band. SOLUTION: A parallel resonance circuit (band removal filter) 12 formed of the parallel connection of a capacitor and a coil is inserted between an antenna input terminal 10 and a band III reception circuit in DAB(digital audio broadcasting) in series to the band III reception circuit. The resonance frequency of the parallel resonance circuit 12 is 1.5 GHz of an L band, and impedance becomes maximum with respect to the L band to inhibit the passage. A band pass filter 14 having a dielectric resonator is inserted between the antenna input terminal 10 and an L band reception circuit. Only the signal of the L band passes through the band pass filter 14 and is supplied to the L band reception circuit.

Frequency Stability of L-Band, Two-Port Dielectric Resonator Oscillators

Abstract: Dielectric resonator oscillators operating at 1.5 and 2.0 GHz, based on a two-port resonator design incorporated into a basic feedback oscillator configuration were evaluated and show state-of-the-art, close-to-carrier phase noise performance. Typically, at 1 KHz carrier offset frequency the single sideband phase noise levels were -130 dBc/Hz and -120 dBc/Hz for the 1.5 GHz and 2.0 GHz oscillators, respectively. Vibration sensitivity was also investigated and the resonators show fractional frequency changes per g in the range of 10/sup -7/ to 10/sup -9/ for the 1.5 GHz and 2.0 GHz designs, respectively.

Automatic satellite searching and network access device of IP-star satellite mobile station

Abstract: The utility model relates to an automatic satellite searching and network access device of an IP-star satellite mobile station. According to the connection relation of components of the device, a satellite antenna system is respectively connected with a power amplifier and a downlink L band frequency converter; the downlink L band frequency converter is respectively connected with a frequency selection module and a tracking receiver through a splitter; the tracking receiver and a user end are in mutual information bidirectional feedback connection; the frequency selection module is connected with the splitter, the user end and a modem; the modem is connected with the power amplifier, the frequency selection module and the user end; and the power amplifier is connected with the user end and the satellite antenna system. According to an operation process provided by the utility model, a GPS chip carries out positioning; the tracking receiver determines the spot beam of the satellite mobile station; the user end receives, analyzes and processes the spot beam information; a satellite antenna servo mechanism commands a satellite antenna to carry out automatic satellite searching; the modem carries out network access connection according to the information; and network access is successful. The automatic satellite searching and network access device provided by the utility model has the advantages of low operation cost and high practicability.

Optical channel monitoring system with simultaneous C-band and L-band detection

Abstract: A monitoring system has the capability to monitor multiple signal bands simultaneously. Specifically, in one embodiment, the monitoring system can simultaneously monitor the C- and L-bands. As a result, the time to scan through the spectral band can be reduced by half. The system comprises a signal source for an optical signal having spectrally separated channels distributed within a first spectral band and a second spectral band. A tunable filter filters this optical signal. A dichroic filter separates the first spectral band from the second spectral band in the optical signal, which has been filtered by the tunable filter. Thereafter, first and second optical detectors detect the respective spectral bands to the filtered optical signal.