We report a flexible carbon nanotube (CNT) thin-film transistor (TFT) fabricated solely by ink-jet printing technology. The TFT is top gate configured, consisting of source and drain electrodes, carrier transport layer based on an ultrapure, high-density (>1000 CNTs/μm2) CNT thin film, ion-gel dielectric layer, poly(3,4-ethylenedioxythiophene) electrode. All the elements are printed at room temperature polyimide substrate without involving any photolithography patterning or surface...

In this letter, we present a two-dimensional 2-bit 4 × phased-array antenna on flexible Kapton substrate fabricated using inkjet printing. Printed carbon nanotube thin-film transistors (CNT-TFTs) form the switching elements in phase-shifting network. A multilayer interconnection scheme has been utilized to fully package subsystem and enable convenient access of control lines 64 CNT-TFTs. By appropriately controlling off states TFT switches computer mainframe, beam steering 5-GHz RF signal at...

In this paper, we present a graphene field effect transistor (FET) fabricated on flexible Kapton substrate using 3-D inkjet printing for use as biosensor to detect infectious organisms. Inkjet process of film is described with sheet resistance low 110 Q/sq. To suppress background noises, the biosensors are based intensity changes ac signal function biological agents' concentration. Using foodborne pathogen, Norovirus, proof-of-concept disease target, value S12 (i.e., voltage gain from source...

Flexible antennas offer many advantages for communication, radar, RF identification, and energy harvesting applications. A review on the material selection fabrication process of flexible is presented since these aspects are critical to antenna’s overall electrical mechanical performance. number different techniques reviewed in detail types antennas. In addition, experimental results also discussed antennas, which further underlines importance various processes.

We report multiple beam transmission and reception of an X-band phased antenna array utilizing highly dispersive photonic crystal fiber (PCF), which has a dispersion value - 600 ps/nm/km at 1550 nm, as true-time-delay (TTD) elements. In the mode, two RF signals with frequencies 8.4 12 GHz are simultaneously steered angles 7.4 21.2 degrees, respectively. receiving mode experiment, impinging upon from -7.4 -21.2 respectively, detected arrival determined accurately. Many beams can be...

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, RF power distribution networks are all developed adopting room-temperature printing The PAA working at 5.2 GHz is on flexible DuPont Kapton circuit polyimide film to demonstrate the nature. High-speed carbon-nanotube-based field-effect transistors (FETs) function switches route signal go...

The statistic models for evaluating the fading term caused by incoherent scatter in clear and rainy environments are derived, which critical establishing multiple-input multiple-output (MIMO) channel model at Ka band. of Ka-band single-polarization MIMO satellite-earth link is established, comprehensively takes into account propagation scattering effects induced those environments. Based on model, bit error rate (BER) performances investigated taking an assumed 2 × 30 GHz circular...

A multiple-beam optical beamformer based on highly dispersive photonic crystal fibers (PCFs) is presented. Each radio-frequency (RF) beam can be independently controlled to steer continuously. The dispersion of the fabricated PCFs as high -600 ps/nmldrkm at 1550 nm. Simultaneous two-beam transmission demonstrated using two lasers with different wavelengths. wavelengths generate independent sets time delays, which correspond RF beams.

Hybrid photonic true-time delay modules for phased-array antennas are designed and demonstrated. Continuously tunable network based on highly dispersive bandgap fiber (up to 2135 ps/nm/km at 1570 nm), combined with a programmable utilizing optical waveguide line switches, provides the antenna quasi-continuous steering ability. Far-field patterns simulated measured confirm squint-free beam steering.

Low-cost and conformal phased array antennas (PAAs) on flexible substrates are of particular interest in many applications. The major deterrents to developing PAA systems the difficulty integrating antenna electronics circuits surface, as well bendability oxidation rate radiating elements circuits. In this research, graphene ink was developed from flakes used inkjet print element active channel field effect transistors (FETs). Bending tests were carried out validate application printed thin...

Continuous pin-hole free FA0.78Cs0.22Pb(I0.85Br0.15)3 films are deposited by gas-assisted slot-die printing under ambient conditions using DMF/DMSO based ink containing Formamdinium Acetate additive. Using a binary solvent mixture of DMF and DMSO is effective in eliminating the non-perovskite phase that occurs when alone used. Print-speed, gas flow rate chuck temperature optimized to realize homogeneous with constant bandgap (1.63 eV) over large substrates (2″ × 4″). The perovskite prepared...

A highly dispersive dual-concentric-core pure silica photonic crystal fiber is designed with a maximum chromatic dispersion value of about -9500 ps/(nm km) around the 1.56 microm wavelength region and full width at half-maximum (FWHM) 55 nm. The change in dispersion-bandwidth product as function period carefully studied by using plane wave expansion method. coupled mode theory matches well method that was used to simulate dispersion. This kind structure suitable for high-dispersion...

This paper presents the development and characterization of an ink-jet printed 2-bit, 1×4 phased-array antenna (PAA) system on a flexible Kapton polyimide substrate utilizing carbon nanotube thin-film transistors (CNT-TFTs) as switching elements in phase-shifting network. A multilayer metal inter connection strategy is used to fabricate complete PAA with control lines. By appropriately controlling ON OFF states various switches, 4.99 GHz signal steered from 0° -27°, measured far-field...

Fully inkjet-printed device fabrication is a crucial goal to enable large-area printed electronics. The limited number of two-dimensional (2D) material inks, the bottom-gated structures, and low current on/off ratio thin-film transistors (TFTs) has impeded practical applications 2D TFTs. In search for TFTs with high ratios, we introduce stable efficient method nitrogen-doped graphene (NDG) ink preparation inkjet printing by liquid-phase exfoliation. NDG thin film print-stacked molybdenum...

A fully integrated 4-bit true time delay device using polymer optical switches and waveguide lines is demonstrated. The fabricated device, which contains five 2x2 thermo-optic switches, has a maximum power consumption of 143 mW switching less than 3 ms. rf phase error, affected by the switch cross talk, also theoretically analyzed proved to be negligible experimental results.

This paper presents the development and characterization of self-aligned carbon nanotube thin-film transistors (CNT-TFT) on flexible substrates. The channel consisting dense, aligned, 99% pure semiconducting single-walled CNT is deposited using dip-coat technique a sacrificial substrate then transferred device substrate. source, drain, gate structures are formed by ink-jet printing technique. A novel source-drain contact formation wet droplet silver ink prior to application has been...

We demonstrate a new, low-cost, additive aerosol jet (AJ) printing fabrication method for 3-D on-chip interconnects on III-V semiconductor chips. A dielectric layer and bridge-type gold were printed GaAs-based microwave monolithic integrated circuit (MMIC) to connect gate pad ground of the MMIC. The MMICs with show same RF performance as those tested before voltage biased at 0 V. This indicates that can provide effective reliable connections. Extensive reliability tests including thermal...

We report the growth of zirconium oxide (ZrO₂) as a high-<italic>k</italic> gate dielectric for an inkjet-printed transistor using low-temperature atomic layer deposition (ALD) from tetrakis(dimethylamido)zirconium (TDMAZr) and water precursors.

In this article, an inkjet-printed tree-shaped fractal antenna (FA) with a small metal footprint is presented along its method of fabrication on flexible substrate. The includes part, tapered matching line, and coplanar waveguide (CPW) line filleted grounds. tree formed by repeating scaled V-shaped unit cell in each iteration. As the iterations are increased, resonance frequency shifts large range frequencies while radiation properties, dimension, remain almost constant. Six different...

Graphene flakes (&lt;5 layers) are produced by CVD and electrochemical delamination. Isolated graphite without sintering, cu powder with graphene is separated water.

We present a flexible active 2-bit 2-element phased-array antenna (PAA) fully fabricated using ink-jet printing technology. High speed carbon nanotube (CNT) based field effect transistors (FETs) function as switch in the true-time delay line of PAA. The PAA is printed out at room temperature on 100μm thick Kapton substrate. FET works well for 5GHz RF signals. An ON-OFF ratio over 100 obtained low Vds bias 1.8V. measured azimuth beamsteering angles agree with simulation values.

We demonstrate the pulse compression at 1554 nm using one stage of highly anomalous dispersive photonic crystal fibers with a dispersion value 600 ps/nm∙km. A 1.64 ps is compressed down to 0.357 factor 4.6, which agrees reasonably well simulation 6.1. The compressor better suited for high energy ultra-short than conventional low single mode fibers.