Esra AlkınCeyhan TürkmenMustafa SeçmenSecmen, MustafaTürkmen, CeyhanAlkın, Esra2025-10-06202213036203, 130006321300-063210.55730/1300-0632.39542-s2.0-85145255405https://www.scopus.com/inward/record.uri?eid=2-s2.0-85145255405&doi=10.55730%2F1300-0632.3954&partnerID=40&md5=ac66670612f2798b7042bfe61b2d1d03https://gcris.yasar.edu.tr/handle/123456789/8772https://doi.org/10.55730/1300-0632.3954https://search.trdizin.gov.tr/en/yayin/detay/1143109In this study the design of a dual-band mode converter which provides transition from rectangular waveguide TE<inf>10</inf> mode to circular waveguide TM<inf>01</inf> mode and operates simultaneously in telemetry/telecommand (TT&C) frequencies is presented along with its equivalent circuit and a mode level measurement technique. This dual-band converter is designed to uniformly excite TT&C slot antennas used in satellite communication with symmetric circular TM<inf>01</inf> mode. The structure can work as a transceiver due to having one common rectangular waveguide feed. As a Ku-band application a converter giving high purity TM<inf>01</inf> mode at circular waveguide at 11.75 GHz/TX and 13.75 GHz/RX center frequencies is designed and manufactured with 3D printing technology. Approximate equivalent circuit models of the designed structure are extracted by using lumped elements from simulated S-parameter results. In addition a measurement technique to detect the normalized power levels of different propagation modes in dual-band mode converter is applied on the manufactured structures to obtain transmission levels of circular TM<inf>01</inf> mode and suppression levels of circular TE<inf>11</inf> mode. It is revealed from the measurement results that while the designed structure gives more than 17.5 dB return loss and suppression of TE<inf>11</inf> mode and less than 0.6 dB insertion loss of TM<inf>01</inf> mode within 500 MHz bandwidth at TX band it gives more than 23 dB return loss and suppression of TE<inf>11</inf> mode and less than 0.3 dB insertion loss of TM<inf>01</inf> mode within 900 MHz bandwidth at RX band. © 2023 Elsevier B.V. All rights reserved.Englishinfo:eu-repo/semantics/openAccessAdditive Manufacturing, Circular Waveguide, Dual-band, Equivalent Circuit Model, Mode Converter, Mode Level Measurement Technique, 3d Printers, Bandwidth, Equivalent Circuits, Level Measurement, Numerical Methods, Radio Transceivers, Rectangular Waveguides, Scattering Parameters, Slot Antennas, Structural Design, Telemetering, Telemetering Equipment, Timing Circuits, Band Modes, Dual Band, Equivalent Circuit Model, Measurement Techniques, Mode Converter, Mode Level Measurement Technique, Returns Loss, Satellite Communications, Telecommands, Tm 01 Mode, Circuit Simulation3D printers, Bandwidth, Equivalent circuits, Level measurement, Numerical methods, Radio transceivers, Rectangular waveguides, Scattering parameters, Slot antennas, Structural design, Telemetering, Telemetering equipment, Timing circuits, Band modes, Dual Band, Equivalent circuit model, Measurement techniques, Mode converter, Mode level measurement technique, Returns loss, Satellite communications, Telecommands, TM 01 mode, Circuit simulationMode ConverterAdditive ManufacturingDual-bandMode Level Measurement TechniqueMühendislik, Elektrik Ve ElektronikCircular WaveguideMühendislik, Hava Ve UzayEquivalent Circuit ModelArticle