L band

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

Tunable Microstrip Combline L-Band Filter Design, Fabrication and Characterization

Abstract: A third order tunable microstrip combline bandpass filter is designed, simulated, fabricated and measured. Varactor diodes provides the electrical tuning, resulting in almost 1 GHz sweep range near the center of the L band. An alternative varactor feeding setup is proposed, which simplifies the fabrication and allows to increase the filter efficiency. A bandwidth of nearly 40 MHz, resulting in less than 3 % FBW is obtained. Insertion loss results in excess of 10 dB over the full sweep range. Filter performance hindrance is evaluated by adequately modeling varactors Q variation and its series resistance nonlinear behavior with frequency. Proper simulation through the use of the Spice model in co-simulation between 3D EM and nonlinear environment resulted of outmost need.

Solar Paddle Antenna on Pico-Satellite for Amateur Radio Communication

Abstract: This paper describes solar paddle antenna proposed in the development of Kagawa Satellite “KUKAI.” KUKAI is a mother-daughter pico-satellite for technical verification of a tethered space robot. The mother and the daughter satellites communicate respectively with the ground station by amateur radio frequencies. For the purpose of simple deployment system on orbit and antenna directivity suitable for KUKAI, solar paddle antenna mounted at the edge of a solar paddle is employed. After sufficient antenna adjustment on the ground, KUKAI was launched on 23 January 2009 by the H-IIA rocket from Tanegashima Space Center. The solar paddles were successfully deployed, and communication by the solar paddle antenna was successful.

Terresterial communication system the invention relates to a terresterial communication system

Abstract: A terresterial communication system, including at least one LTS, preferably located in a mast structure or any other supporting structures, having every LTS a high-frequency communication equipment in response to the conventional synchronous satellite for digital transmission of video signals, audio frequencies or data for emission at a low output or a higher frequency than others in the L band (1-2 GHz), S band (2-4GMz), and having a better full-direction antenna for horizontal emission.

L-band satellite receiver

Abstract: a L-band receiver antenna 10; a low-noise amplifier 20; first and second amplifier 30 and 31 for amplifying a signal passed through the low-noise amplifier 20; a band pass filter 40 for filtering the whole band of an input signal; a intermediate frequency section 500 for outputting an intermediate frequency by a single synthesizer 52; a costas loop section 700 including a temperature compensating voltage-controlled oscillator 100 for oscillating a reference frequency used in the single synthesizer 52, and a reset circuit 110 for setting an initial value to the temperature compensating voltage-controlled oscillator 100; and a sampling section 80 for sampling a demodulated data.