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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21 Aug 2014
2 citations
01 Jan 2006
2 citations
24 Apr 2013
TL;DR: Radio transmitter system is built for nano and micro satellites that broadcasts 1W power in 435 MHz free amateur satellite communication band and also has software defined radio structure in all modules except upconvertion part.
Abstract: In recent years, small satellites have begun to draw attention due to reconstruction in low cost of manufacture and faster building time. In this project, radio transmitter system is built for nano and micro satellites. Transmitter broadcasts 1W power in 435 MHz free amateur satellite communication band, and also has software defined radio structure in all modules except upconvertion part. Design was capable of DE0-Nano evaluation board connection; it is regard of PC104 connector structure standard. FSK modulation and AX.25 data link layer protocol are designed using digital circuit in FPGA and implemented with VHDL.
2 citations
TL;DR: An experimental broadcasting satellite system for community reception in Japan is described mainly from the broadcaster's point of view in this article, with the long-range view of solving reception difficulties, a problem which NHK has to work out in such areas as mountains, remote islands and building-shadowed places; and providing for more educational channels.
Abstract: An experimental broadcasting satellite system for community reception in Japan is described mainly from the broadcaster's point of view. A national study was initiated with the long-range view of (a) solving reception difficulties, a problem which NHK has to work out in such areas as mountains, remote islands and building-shadowed places; and (b) providing for more educational channels. A national-level study was initiated by taking a first step consisting of an experimental satellite to examine the technical feasibility and determine the most suitable system. For transmission of two color television channels, a 350-kg satellite will cover this island nation with a shaped-beam antenna with 58 dBW/ch maximum EIRP. This would allow the use of a 500 K-receiver input circuit, a 1.6-m antenna for the central service area and a 4.5-m antenna for the outer service area.
2 citations
01 Oct 2017
TL;DR: A novel stacked tri-band antenna which has three independent ports is proposed which has achieved a bandwidth of 3%, 3% and 18% at each band, respectively.
Abstract: Shared aperture multiband antenna has more application when the electromagnetic compatibility problem is more and more serious. This paper proposes a novel stacked tri-band antenna which has three independent ports. Many dual band compact microstrip patch antenna has been designed but the research about tri-band microstrip antenna which can work in L, S and C band was little. To obtain tri-band operation, a stacked four layers of microstrip antenna working at different frequency is presented. Each of them is fed by dual feed probes. The simulated results show that the antenna can work at L band 1.66GHz, S band 3.25GHz and C band 5.27GHz with high isolation. The proposed antenna has achieved a bandwidth of 3%, 3% and 18% at each band, respectively.
2 citations