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Abstract: In this thesis, we aimed to design, test, and implement a custom transmitter for electromagnetic compatibility (EMC) testing. After assembling a technological overview of all relevant technologies, we engineered the design of the first prototype. It was a battery powered, manually tunable, communication isolated, compact, portable transmitter that can operate without other control devices in a test setup. The central parameters of improvement were enhanced power output and EMC. The power output needed to be manually tunable and enable constant magnetic field strength over a select set of distances. We had to implement all enhancements to the design while simultaneously improving the electromagnetic compatibility as much as possible. We were focusing on the noise produced by the transmitter itself. According to the test plan, we performed tests in signal quality, output power over distance, and EMC in a GTEM cell. In the first prototype, we did not reach the goals of increasing power output, adding the ability to adjust the output power manually, and increasing electromagnetic compatibility. The amplification stage and output driver stage did not meet the full specifications. The initial stages of the transmitter were fully functional, and we can include them in the next design.
Keywords: transmitter, EMC testing, wireless transmission, signal synthesis.
Published in DKUM: 16.12.2025; Views: 0; Downloads: 0

Abstract: This work presents an observation of the analog and digital architecture of the reception system of a radio-frequency identification (RFID) reader in the high frequency (HF) domain and the creation of near-field communication (NFC) Application, which is developed for Android and iOS users. This thesis includes a description of RFID and NFC technology, as well as a sufficient amount of information about the standards that define those technologies. The reception system of a given interrogator was thoroughly studied, beginning with the analog signal on the interrogator’s antenna and how it is interpreted in the analog domain for determining the presence of an object in its vicinity. The most emphasis in this thesis was given to the reader when it is in a Tag Detector mode. The Tag Detector mode of the reader is the mode in which the interrogator can detect changes on its antenna. Measurements were taken while testing the Tag Detector at various gain settings of the reception system. To improve the accuracy of those detections, the Tag Detector mode was switched to reader mode, allowing the detected tag’s acknowledgement message to be received. The detection range, as well as the reading range of the interrogator, are also discussed. An NFC application was developed that functions as an interrogator for both the iOS and Android operating systems. The goal of this application is to apply the knowledge we have gained from the study about RFID and NFC communications, as well as the comparison between the tag detection and read ranges of the two types of interrogators.
Keywords: Keywords: NFC, RFID, receiver, transmitter, Tag Detector, interrogator, read range, tag detection range
Published in DKUM: 28.06.2022; Views: 790; Downloads: 70
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