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Low Cost Active Phased Array Transceiver for WPAN Application
Keywords: WPAN System, Active Phasd Array Antenna Transceiver, Low cost technological implementation
THE ITEM. WPAN equipments are attractive transceivers working in the range of 60 GHz, intended to handle signals with very wide bandwidth. Possible application can be HDTV, but data as well. THE PREVIOUS ART. Prototypes of WPAN transceivers have been already implemented. Some of them are using fixed radiators with single lobe radiation pattern, characterized by moderate aperture and moderate gain, (Vivaldi antennas). Some slightly more advanced systems use arrays of radiators with two fixed lobes radiation pattern, finalized to transmission in “diversity”. The related gain is relatively high, and the radiation beams are relatively narrow. The third technical solution is based on MIMO approach. MIMO technology is most effective at low frequency, (WI-FI, WI-Max), but at 60 GHz has marginal performances: the wall reflection attenuation is the major handicap. THE POSSIBLE SOLUTION. The only way to overcome the limits of the mentioned solutions would be a system with the following characteristics: 1. High transmitted power density, achievable by using narrow beam antennas. 2. User tracking ability, achievable by beam steering. An Active Phased Array Transceiver can meet these performances. The problem is that the present technology for APAA is characterized by production costs prohibitive even for military application. THE ACTUAL SOLUTION. We have invented, patented and designed a WPAN system based on Active Phased Array Transceiver, characterized by low production cost. We have achieved this goal with an unprecedented system and circuit approach, and the use of the new subsystem called “Distributed Local Oscillator”. Within the output power limit of 10 dBm, (FCC regulations), the new system has transmission range more than twice the best previous system. Moreover, using the proper antenna, the system is able to penetrate the most common walls, still being effective in its service.
Alberto Milano, CTO
Beam Networks Ltd.
Rehovot 76248,
Israel


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