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Miniaturized and Reconfigurable CPW Square-Ring Slot Antenna Loaded With Ferroelectric BST Thin Film Varactors

2012; IEEE Antennas & Propagation Society; Volume: 60; Issue: 7 Linguagem: Inglês

10.1109/tap.2012.2196918

1558-2221

Hai Jiang, Mark Patterson, Dustin Brown, Chenhao Zhang, KuanChang Pan, Guru Subramanyam, David Kuhl, Kevin Leedy, Charles Cerny,

Acoustic Wave Resonator Technologies

A novel miniaturized and reconfigurable coplanar waveguide (CPW) square-ring slot antenna is presented in this paper. The miniaturization is achieved via a hybrid approach including ferroelectric varactor loadings, high dielectric constant materials, and tuning stub for impedance matching. For the first time, nine shunt ferroelectric (FE) BST (Ba (1-x) Sr x TiO 3 ) thin film varactors are integrated with the CPW antenna structure achieving both antenna miniaturization and reconfiguration at the same time. The size of the miniaturized antenna is reduced to 0.067λ 0 0.067λ 0 without ground, and 0.1λ 0 0.1λ 0 with ground. The resonant frequency of the miniaturized antenna can be reconfigured from 5.3 GHz to 5.8 GHz by applying a DC voltage. Measured E-plane and H-plane co-polarized patterns are presented.