The mixer is one of the key components in transmitter an‎d receiver systems; the overall system performance quality largely depends on its proper design. One of the main challenges in mixer design is the presence of the image frequency component, which carries no information content an‎d, if not eliminated, causes a reduction in the signal-to-noise ratio an‎d reception of spurious frequency with no information. In radar systems, the presence of this component can lead to incorrect target detection. Additionally, in transmitter architectures, simultaneous transmission of both sideban‎ds not only reduces spectral efficiency but also increases the likelihood of interference in other frequencies. Therefore, effective elimination of the image frequency an‎d the ability to transmit a single sideban‎d are key requirements in the design of advanced mixers.In this thesis, a millimeter-wave mixer with the capability to suppress the image frequency an‎d single sideban‎d transmission in a transmitter is designed an‎d simulated. This mixer is designed for use in millimeter-wave communication systems, especially in 5G mobile applications an‎d satellite links. First, various methods for removing unwanted frequencies, including the use of symmetrical arrangements an‎d multi-path structures, are analyzed. Then, several mixers to improve image frequency suppression an‎d reduce spurious signals are designed an‎d simulated. Finally, image rejection ratio of 60 dB an‎d a conversion gain of over 11 dB at operating frequency of 28 GHz are achieved.

ابوالقاسم زيدابادي نژاد

محمد صدقي

ذاكرحسين فيروزه , احمد بخت افروز