A compact circularly polarized multiple input multiple output (CP‐MIMO) array antenna for point‐to‐point communication is proposed in this article. The two by four‐element antenna array, dimensioned at 58 × 110 mm2 is composed of rectangular‐shaped with corner‐truncated radiating elements. The presented antenna is developed by two MIMO element with circular polarization characteristics aims to boost gain, more robust to adverse weather conditions and less signal's reflection. By constructing eight 45° truncated edges of 2.45 mm, 45 mm element spacing of Y‐axis, and 39.5‐mm element spacing of X‐axis together contribute to the circular polarization capability of 2.24 axial ratio, 0.00031024 correlation coefficient, and 10 dB diversity gain. The CP‐MIMO antenna which is fed by two coaxial feeds has produced the gain up to 14.25 dB with reflection coefficient of −24.5 dB. Thus, combination of circular polarization, high gain, and excellent MIMO characteristics collectively lead the proposed CP‐MIMO array antenna to avoid significant attenuated signals under adverse atmospheric condition and propagation issues such as reflection, absorption, phasing, and multipath. The proposed antenna's operating frequency of 5.8 GHz has great potential to be applied in point‐to‐point wireless backbone communication system. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:242–247, 2015

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by detecting the fringe visibility of the interference patterns. Owing to the use of combination interference structure, experimental results show that the curvature sensor with maximal sensitivity of 10.171 dB m 21 within a measurement range of 0-0.48 m 21 is obtained. The low thermo-optic and thermoexpansion coefficient of the HiBi-PCF makes it is possible for the proposed sensor to overcome the temperature and curvature cross-sensitivity effects. ACKNOWLEDGMENTS

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A two‐port circular polarization (CP) array antenna is presented in this article. The proposed antenna used two‐port which each port is designed with 2 × 2 array structure and both array consist of four circular radiating elements. The used of 90° triple‐coupled phased shift polarizer at both left and right side of circular‐slotted patches with two‐port generate CP aptitude with high gain performance. Moreover, the presence of slots at center of circular elements produce discontinuity effect to assist change in the E‐field and H‐Field rotation of RF current and force the current to flow in CP. Axial ratio of 1.95 dB confirms the CP capability. Nonetheless, the proposed antenna demonstrates a good characteristic for MIMO's isolation with mutual coupling of −55.0 dB (S12) and −45.1 dB (S21), correlation coefficient of 1.2015e‐4 and diversity gain (Gapp) of 9.9999. The proposed antenna also produced gain as high as 13.23 dB for both port. With those capabilities, the antenna designed is suitable for 5.8 GHz point‐to‐point communication. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2328–2332, 2015