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An orthogonally polarised stacked square microstrip patch array antenna structure with high-isolation performance is proposed for single channel full duplex wireless communications. A double symmetric microstrip array structure is collaborated with a special self-interference cancelling network called differential feeding network (DFN) in order to achieve high-isolation performance. The proposed 2 × 2 and 4 × 4 symmetric array antenna structures with the DFNs were designed to operate at the idustrial, scientific and medical band of 2.34-2.54 GHz. By measurement, the average isolation performances of 53 and 60.7 dB were obtained in 200 MHz frequency band by the 2 × 2 and 4 × 4 array antennas, respectively. The measured average gains of the 2 × 2 and 4 × 4 array antennas were found to be 14.4 and 19.4 dBi, respectively.

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This article presents a dual‐resonator antenna where a stacked microstrip patch antenna uses a protruding dielectric rod for high gain, and a sleeve‐dipole antenna to support the rod as well as to resonate at another frequency.The proposed antenna structure could be optimized at any two frequencies. However, we designed the microstrip patch to resonate at 2.44 GHz while the sleeve‐dipole at 0.859 GHz. Main points of designing considerations and electrical performances of a fabricated antenna were briefly discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1835–1838, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26933