Theory and design of a tunable antenna on a partially magnetized ferrite LTCC substrate

Abstract
For the first time, a theoretical model is presented to predict the frequency tuning of a patch antenna on a partially magnetized ferrite substrate. Both extraordinary (E) and ordinary (O) modes of the antenna are studied. The permeability tensor of the partially magnetized ferrite is calculated through the proposed theoretical model and is subsequently used to analyze the antenna's performance in a microwave simulator. Prototype antennas were built, using two different bias windings, embedded in a multilayer ferrite LTCC substrate, to demonstrate E and O mode tuning. The use of embedded windings negates the requirement of bulky electromagnets, thus providing miniaturization. The concept also eliminates the demagnetization effect, thus reducing the typically required bias fields by 95%. The prototype measurements at 13 GHz demonstrate an E-mode tuning range of 10%. The proposed theoretical model has been validated by simulations and measurements. The design is highly suitable for compact, light-weight, tunable and reconfigurable microwave systems. © 1963-2012 IEEE.

Citation
Ghaffar, F. A., Bray, J. R., & Shamim, A. (2014). Theory and Design of a Tunable Antenna on a Partially Magnetized Ferrite LTCC Substrate. IEEE Transactions on Antennas and Propagation, 62(3), 1238–1245. doi:10.1109/tap.2013.2295833

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Transactions on Antennas and Propagation

DOI
10.1109/TAP.2013.2295833

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