Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 60, Issue 1, Pages 179-184Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2011.2173209
Keywords
Carbon nanotube (CNT); conformal antennas; field-effect transistor (FET) switches; ink-jet printing; phased-array antennas (PAAs)
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Funding
- National Aeronautics and Space Administration (NASA) [NNX08CB39P]
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We present a conformal ink-jet printed 2-bit four-element phased-array antenna (PAA) without any lithography process. Passive and active components, such as microstrip transmission lines, phase shifters, and RF power distribution networks are all developed adopting a room-temperature printing process. The PAA working at 5.2 GHz is printed on flexible DuPont Kapton flexible printed circuit polyimide film to demonstrate the conformal nature. High-speed carbon-nanotube-based field-effect transistors (FETs) function as switches to route the RF signal go through different segments of the true-time delay lines. The FET switch exhibits an ON-OFF ratio of over 1000 and current of 3.6 mA is obtained at a low source-drain bias of 0.8 V. The 2-bit azimuth beamsteering angles of the PAA are measured and confirmed to agree well with simulation values.
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