Testing and Validation of Adaptive Impedance Matching System for Broadband Antenna
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electronics-08-01055.pdf
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Final Published Version
Affiliation
Univ Arizona, Dept Elect & Comp EngnIssue Date
2019-09-19Keywords
adaptive matching tunerRF impedance tuner
broadband matching
MIMO
5G technology
antenna impedance tuner
Metadata
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MDPICitation
Hur, B.; Eisenstadt, W.R.; Melde, K.L. Testing and Validation of Adaptive Impedance Matching System for Broadband Antenna. Electronics 2019, 8, 1055.Journal
ELECTRONICSRights
Copyright © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Broad RF impedance matching is challenging; however, the need for broadband matching is found frequently in modern RF and wireless systems with multiple wireless standards. Moreover, in 5G technology, multiple frequency bands are used, and these systems typically employ a broadband antenna or multiple antennas. Antenna impedances vary from design targets for many reasons including manufacturing process variations or antenna environment changes. An adaptive impedance matching system (AIMS) for testing and validation is introduced, and its implementation is shown in this paper. The AIMS can control impedance matching tuner settings to provide an arbitrary impedance frequency-varying load that meets user-defined conditions. This AIMS provides a testing and validation system for broadband antennas that can be characterized by various settings of the impedance matching tuner. As a device under test (DUT), a three-stub reconfigurable filter was used as the impedance matching tuner on a RT/Duroid 6010 RF board. It was integrated with a control circuit board. This AIMS implementation also included an antenna impedance tuner that can vary the distance between the antenna and the ground plane. This model represents practical antenna impedance variations. The AIMS controls a network analyzer and the impendence matching tuner. The adaptive control program on a PC was developed to perform an effective two-pass tuning strategy. This article presents the successful automated tuned results and their numerical evaluations of three cases that were generated by the antenna impedance tuner.Note
Open access journalISSN
2079-9292Version
Final published versionSponsors
SRC Global Research Collaboration (GRC) program; Freescale Semiconductor [1663.001, 1836.026]; Hur's Texas A&M start-up research fundae974a485f413a2113503eed53cd6c53
10.3390/electronics8091055