Dual-Frequency Decoupling for Two Distinct Antennas

Constant development of new wireless standards increases the demand for more radiating elements in compact end-user platforms. A decrease in antenna separation gives rise to increased antenna coupling, resulting in a reduction of the signal-to-interference-plus-noise ratio (SINR) between transmitter and receiver. This letter proposes a decoupling network that provides dual-band port isolation for a pair of distinct antennas. A prototype has been fabricated to verify the theory.