ADTI’s Products of Particular Importance:
• Multi-frequency wideband phased array antennas capable of operating from 8 to 40 GHz without the need for switching or reconfiguration for communications
• Wideband phased array antennas operating from 3 to 12 GHz and 8 to 20 GHz designed for wideband multi-mission radar systems
• Low loss wideband high power handling phase shifter (beam steering technology) design capable of providing differential phase shift between multiple (min. 4) adjacent antenna feed lines in an antenna array providing simple, compact and more reliable antenna architectures
• Planar antenna arrays covering multi-octave frequency bands
• T/R modules operating up to 40 GHz
• Wideband multi-channel (2, 4 and 6 channel) transceiver systems operating up to 40 GHz
• Small size, planar Diplexer/multiplexer networks providing full duplex communication links
• High-Q, low loss, high power handling frequency agile filter banks and band stop (notch) filters capable of suppressing the unwanted Co-site interference signals in the military RF receiver systems
• High speed digital data interfaces
• Wideband RF antenna systems for:
• High speed data communications
• Mobile communications
• Sensor systems
The current phased array radars, sensors and communication data link systems are very expensive, complex, and large and suffer from weight problems and very high DC power dissipation requiring extensive cooling arrangements.
• More than 45% of phased array system cost is attributed to the conventional phase shifters and voltage control drivers and RF amplifiers.
• Ferrite-based phase shifters used for beam scan require strong magnetic fields. This is most commonly done with coils which require bias voltages in the hundreds to thousands of volts. Ferrite phase shifters also have slow response.
• Solid state phase shifters based on MMIC technology are fast and require low drive voltages. The major drawback of MMIC technology is the low power handling capability. Wideband solid-state phase shifters suffer from higher insertion loss of >10 dB which is difficult to compensate at high frequencies resulting in very complex and expensive system designs.
• MEMS in phase shifters require extensive fabrication processing which makes them expensive. MEMS also have serious reliability issues and MEMS are not capable of high power handling.
• A single phased array radar or communication system could consist of a large number (hundreds to thousands) antenna elements, RF amplifiers, Phase shifters and voltage drivers to meet system requirements resulting in a very complex, large and expensive systems with severe cooling requirements.Basic engineering sense is: who wants to deal with thousands of phase shifters and voltage control circuits in a system design?