Nippon Telegraph and Telephone Corporation (NTT) has announced the world's smallest wireless transceivers with full 60 GHz band coverage. The company said that it had successfully developed what they claimed to be "the world's smallest wireless transceivers" that can cover all four channels allocated in the 60-GHz band.
The maximum transmission rate is of 3.8 Gbps per channel, providing about 15 Gbps if all four channels are used simultaneously. One application for the transceivers is rapid download of content from kiosk terminals in convenience stores, malls, train stations, airports, and other such venues. At these data rates, the unlicensed device can be used to download a gigabyte of content in about 10 seconds. At such a data rate, the speed of the storage device is likely to be a limiting factor.
The transceiver uses a microstrip antenna with stacked rings formed on a multilayer LTCC (Low Temperature Co-fired Ceramics) substrate. This gives it a gain of 10 dBi in the 60 GHz band. To increase bandwidth, the device uses four-stage directional couplers. The NTT news release explains, "The lumped capacitor lies at the center point of the coupled line. This capacitor effectively increases the coupling, resulting in tight coupling. By properly choosing the physical shape, the bandwidth and the phase characteristics of the coupler are effectively improved."
More technical data and pictures of the device are available from www.ntt.co.jp.
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Doug Lung is one of America's foremost authorities on broadcast RF technology. As vice president of Broadcast Technology for NBCUniversal Local, H. Douglas Lung leads NBC and Telemundo-owned stations’ RF and transmission affairs, including microwave, radars, satellite uplinks, and FCC technical filings. Beginning his career in 1976 at KSCI in Los Angeles, Lung has nearly 50 years of experience in broadcast television engineering. Beginning in 1985, he led the engineering department for what was to become the Telemundo network and station group, assisting in the design, construction and installation of the company’s broadcast and cable facilities. Other projects include work on the launch of Hawaii’s first UHF TV station, the rollout and testing of the ATSC mobile-handheld standard, and software development related to the incentive auction TV spectrum repack.
A longtime columnist for TV Technology, Doug is also a regular contributor to IEEE Broadcast Technology. He is the recipient of the 2023 NAB Television Engineering Award. He also received a Tech Leadership Award from TV Tech publisher Future plc in 2021 and is a member of the IEEE Broadcast Technology Society and the Society of Broadcast Engineers.