A broadband cavity-backed proximity-coupled stacked microstrip antenna is presented. Due to the interaction of the two stacked patches, two associated resonances are produced. Unlike conventional proximity-coupled or cavity-backed microstrip antennas, the lower patch and the cavity of this antenna produce the coupled resonances. These devised methods make the antenna act as multiple resonances, conducing to a broadband impedance matching. The simulated and the measured results demonstrate a bandwidth over one octave . In the meantime, stable radiation patterns are obtained across the entire impedance band. The key parameters of the antenna are studied, and a prototype antenna that has a three-dimensional interconnection structure is provided.Index Terms-Broad bandwidth, cavity-backed microstrip antenna, proximity-coupling, stacked patches, three-dimensional interconnection.
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