Coaxial antenna in the range 144-146 MHz. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antennas. Measurements, adjustment, coordination
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The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>
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| Random news from the Archive Television and astronomers
11.06.2010
For American astronomers, there was a respite: with the transition of television in the United States to digital broadcasting, radio frequencies in the range of 700-800 megahertz, previously occupied by analog television programs, were temporarily released.
It is on these waves that we can expect the discovery of new galaxies that arose at a time when the Universe was half as young as it is now. In addition, experts hope to find signals from new pulsars, neutron stars, periodically emitting radio waves in the freed range.
To use the opportunities that have opened up, a new radio receiver has already been mounted on a huge radio telescope in Arecibo (Puerto Rico). True, the respite will last only about a year: the released frequencies are sold at auctions to mobile operators and other interested parties.
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