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RF Shorts: Other Items of Interest - Oct. 22, 2009

Tobu Tower Sky Tree

  • • Tokyo now has an entry in the competition for tallest tower. The Examiner article Tokyo reworks tallest tower plan reported that Tobu Railway and Tobu Tower Sky Tree, the tower constructors, announced the project calls for extending the topmost antenna by 24 meters (79 feet) making the overall height 634 meters above ground. However, the article does acknowledge that there are taller towers. The Burj Dubai tower is 818 meters high. When the Tokyo Sky Tree tower is completed in the Narihirabashi/Oshiage area of the Sumida Ward in Tokyo it will have two observation decks and will broadcast digital TV signals for multiple TV stations.
  • • Antenna design at any frequency can be difficult, but imagine trying to make even a simple dipole antenna work at frequencies of several hundreds of thousands of gigahertz! Smallest Nano-antennas for High-speed Data Networks describes microscopic antennas made from gold by scientists at Karhsruhe Institute of Technology (KIT) that work at optical frequencies (500,000 GHz is the frequency of yellow light). These nano-antennas have the potential to be used for optical high-speed data networks. Resonant antennas provide more efficient capture of light. Nano-antennas may also have applications in optical microscopy and photovoltaic power generation. The article has a picture of a nano dipole with colors reflecting the different transmission frequencies.

Doug Lung is one of America's foremost authorities on broadcast RF technology. He has been with NBC since 1985 and is currently vice president of broadcast technology for NBC/Telemundo stations.