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An Optically Invisible Antenna-on-Display Concept for Millimeter-Wave 5G Cellular Devices

Title
An Optically Invisible Antenna-on-Display Concept for Millimeter-Wave 5G Cellular Devices
Authors
Junho ParkSeung Yoon LeeJongmin KimDongpil ParkWoo ChoiHONG, WONBIN
Date Issued
May-2019
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
This paper proposes the novel concept of an optically invisible antenna built using photolithography that can be integrated in active display panels such as organic light emitting diodes and liquid crystal displays. Represented as antenna-on-display (AoD), this proposed approach is exemplified for future millimeter-wave (mmWave) 5G cellular devices. Empirical examinations confirm that the devised diamond-grid-shaped 2000 A-thick Ag-alloy electrodes on a glass substrate feature electrical loss characteristics of approximately 0.4 dB/mm at 28 GHz amid 88% optical transparency. Using the aforementioned material, a transparent diamond-grid antenna element is formulated and verified. Complete optical invisibility is achieved by implementing identical dummy grids around the antenna region. A multilayer schematic is designed in order to expand the antenna element into a phased-array configuration. The designed and fabricated 1 x 8 optically invisible AoD exhibits 6.66 dBi boresight gain at 28 GHz while maintaining 88% optical transparency. This gain includes 1.5 dB feedline loss and approximately 4 dB anisotropic conductive film (ACF) bonding loss. Current challenges include the immaturity of the ACF bonding process and the gain degradation caused by the dummy grids, and these need to be addressed to further improve the presented AoD concept. Nonetheless, this paper aims to serve as a foremost example for future optically invisible AoD.
Keywords
PATCH ANTENNAS; IN-PACKAGE; CHIP; MULTILAYER; CMOS; FILM; ITO
URI
http://oasis.postech.ac.kr/handle/2014.oak/98916
ISSN
0018-926X
Article Type
Article
Citation
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 67, no. 5, page. 2942 - 2952, 2019-05
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 HONG, WONBIN
Dept of Electrical Enginrg
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