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    5W Linear Power Amplifier Design for 5-6 GHz Applications
    (IEEE, 2022) Erdogan, Sadik Dogan; Kizilbey, Oguzhan; Topaloglu, Serkan; Palamutcuogullari, Osman; Yarman, Siddik
    In this study, class F amplifier is designed and simulated for RF applications with high linearity in the 5-6 GHz band range. 2-way amplification method was used for the implementation. The input signal is transferred to the amplifier circuits after splitting with Wilkinson power divider. The amplified power in the two arms is then collected by the Gysel power combiner and given to the output. The simulations were made in the AWR Microwave Office program on Rogers RT/Duroid 5870 dielectric material with a thickness of 0.78 mm and a dielectric constant of 2.33. Gallium Nitrite HEMT type CREE CGH40006P transistor was used in the design. As a result of the simulation, the at least 11 dB power gain across the band was obtained with 30% power added efficiency and approximately 37 dBm output power.
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    Design and Implementation of a Compact and Long Range Monostatic UHF RFID Reader with Read Point Extension
    (IEEE, 2014) Bostan, Ozgur; Aydogmus, Huseyin Ulvi; Topaloglu, Serkan; Palamutcuogullari, Osman
    In this paper, a compact and long range monostatic UHF (Ultra High Frequency) RFID (Radio Frequency Identification) reader has been designed for UHF RFID applications. Another circuit, called RF multiplexer, has also been designed to reduce the system implementation cost for dense antenna applications. This device has been designed in order to increase the number of antenna output ports of reader, thus enabling extended read point capability via multiple data capture. After the design process, simulation, manufacture and measurement operations has been achieved. Reader is compatible with EPC Gen2 protocol and operates at UHF band. Moreover, the reader has an antenna tuning circuit, a novel feature, to reduce reflected RF power from antennas. This is achieved by tuning output impedance of the reader to the impedance of antenna. A power detector is used to control and limit the output power to regulatory requirements.