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.
Highlights
Modern wireless devices include multiple wireless transceivers or reconfigurable wireless transceiver components in order to meet the needs of various wireless standards
RF circuit parameters can be obtained by this manual engineering effort or by computer simulation, these pre-determined circuit parameters for RF impedance matching may still need to be modified after the RF system is fabricated
An implementation of the adaptive impedance matching system (AIMS) was presented, and testing, validation, and numerical evaluation of the AIMS were shown and discussed. This AIMS can be used for research and development tasks, and it can be applied to medium-/high-power wireless and microwave applications where it needs frequent automatic tuning functions due to the antenna matching variations affected by antenna setting changes
Summary
Modern wireless devices include multiple wireless transceivers or reconfigurable wireless transceiver components in order to meet the needs of various wireless standards. The 5G wireless data network standard adopts a massive MIMO system [6]. RF impedance matching for these broadband antenna impedances is often performed by an RF engineer. RF circuit parameters can be obtained by this manual engineering effort or by computer simulation, these pre-determined circuit parameters for RF impedance matching may still need to be modified after the RF system is fabricated. This need for circuit modification may result from.
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