@inproceedings{27cc68c710f240df9ca9f4feb73ed6af,
title = "Tunable Non-Reciprocal Phase Shifter and Spin-Coated Ferrites for Adaptive Microwave Circuits",
abstract = "Tunable non-reciprocal components with ferrites that can be integrated using a foundry suitable process are key to achieving low-power adaptive microwave circuits. The current state-of-the-art still relies on electrical tuning or resistive absorbers to facilitate unidirectional propagation. Here, we demonstrate a novel process for spin-coating thick films of ferrites without the complexities of vacuum processes or high-temperature annealing. Composites of yttrium iron garnet (YIG) nanoparticles in a matrix spin-on-glass are spin-coated on silicon substrates, and magnetic properties comparable to bulk YIG are obtained in films exceeding 30 microns. We also propose a design for tunable phase shifter based on periodically serrated coplanar waveguide with a YIG cladding. A non-reciprocal phase difference of 20 - 60 degrees is obtained over a tunable band of 550 MHz between 3.85 - 4.4 GHz from a tuning magnetic field of 8 - 40 kA/m.",
keywords = "ferromagnetic resonance, serrated coplanar waveguide, tunable microwave device, tunable phase shifter, yttrium iron garnet, ferrites, microwave antennas, microwave circuits, microwave devices, phase shifters, thick films, transmission line matrix methods",
author = "Karthik Srinivasan and Amal El-Ghazaly",
note = "Publisher Copyright: {\textcopyright} 2023 IEEE.; 1st International Microwave and Antenna Symposium, IMAS 2023 ; Conference date: 07-02-2023 Through 09-02-2023",
year = "2023",
doi = "10.1109/IMAS55807.2023.10066899",
language = "English",
series = "2023 International Microwave and Antenna Symposium, IMAS 2023",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "62--65",
booktitle = "2023 International Microwave and Antenna Symposium, IMAS 2023",
address = "United States",
}