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We present a novel fully printed, conformai phased array antenna with beam forming capability. Analog phase shifters with a left handed transmission line (LHTL) design are used at the feed lines of four patch subarrays. The microstrip LHTL phase shifter is made of series tunable capacitors and shunt inductive stubs. The voltage-variable capacitor (varactor) is an interdigitated capacitor (IDC) filled...
This work presents a parameter-related, one-probe based microwave characterization method for determining complex dielectric properties of various printable dielectric inks from 1–30 GHz. Dielectric constant and loss tangent of a material under test (MUT) are extracted utilizing the measured reflection 511-parameters and analyzed equivalent circuits of a cylindrical capacitor with and without the...
This paper presents all-printed varactors and phase shifters using direct-ink writing methodologies on flexible organic films. The key enabler is a novel ferroelectric nanoink that allows printing high dielectric constant, low loss, and electrostatically tunable dielectrics at extremely low temperatures. The dielectric is made by suspending nanoparticles of barium strontium titanate (BST) in thermoplastic...
There is growing interest in adopting additive technologies for the production of RF/microwave electronics. In addition to the ability for rapid prototyping, printed electronics can offer the manufacturing of electronics in nontraditional form factors-flexible, lightweight, conformable or wearable. Developing printed electronics for the RF/microwave/wireless domain is particularly challenging since...
In this work, we demonstrate the development of a flexible, high-dielectric-constant substrate based on barium strontium titanate (BST)/thermoplastic cyclic olefin copolymer (COC) nanocomposites suitable for fully printable phased array applications. This functionalized BST/COC substrate is demonstrated to possess tunability as a function of an applied DC bias. This tunable substrate is implemented...
A fully printed varactor and a phase shifter using direct ink writing methodologies will be described. A novel ferroelectric ink was developed to print high dielectric constant, low loss, and electrostatically-tunable dielectrics on plastic substrates. The dielectric is based on multiphase Barium Strontium Titanate (BST)/polymer composite made by suspending nano/submicron-sized particles of BST in...
This work describes the development of a wideband RF measurement technique using printed test structures for characterizing the complex dielectric properties of flexible substrates at RF and microwave frequencies. This novel method is based on a single probe measurement using two concentric circular capacitors with different gap sizes that can be additively manufactured on the dielectric film under...
This work presents electrostatic and full wave analysis of an underappreciated model of ferroelectric interdigitated varactor, in which the plates are buried in the ferroelectric thick film. The electrostatic simulations show that with this design the tuning voltage could be decreased by more than 50%. The full wave simulations show that with this design capacitance per unit area could be increased...
We present an electrically tunable Frequency Selective Surface (FSS) at X-band utilizing a novel version of Interdigital Capacitors (IDCs), in which the space between fingers are filled with a ferroelectric composite of Barium Strontium Titanate (BST) suspended in a polymer. We also introduce a low temperature, printed fabrication process on flexible films.
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