Utilization of Screen Printed Low Curing Temperature Cobalt Nanoparticle Ink for Miniaturization of Patch Antennas

This investigation is one of the flrst steps towards the realization of low-cost, mass producible, miniaturized antenna solutions utilizing screen printed magnetic thick fllms of cobalt nanoparticle ink. The ink has a curing temperature lower than 125 - C, feasible printing characteristics and metal loading higher than 85wt.%. The properties are achieved by using an oxidatively polymerising natural fatty acid, linoleic acid, both as a surfactant and a binder. DSC-TGA-MS-analysis, TEM and SEM microscopies were utilized to investigate ink composition, nanoparticle coating and print quality. The resonant frequency of a microstrip patch antenna was tuned by screen printing of cobalt nanoparticle ink with difierent layer thicknesses on top of the antenna element. The in∞uence of magnetic layers on resonance frequency, return loss, total e-ciency and radiation pattern was measured and compared with a reference antenna without the magnetic fllms. For example, flve layers of magnetic fllm (52"m total thickness) tuned the resonance frequency (2.49GHz) of the patch antenna by 68MHz. The radiation e-ciency of the patch antenna was increased from 39% to 43% by the loading of a 52"m thick magnetic fllm compared to the reference antenna. The radiation patterns remained essentially unchanged, despite the presence of the magnetic thick fllms.

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