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A planar monopole UWB antenna with rounded patch and rounded truncated ground plane for ultra-wideband applications is investigated. The geometry of the antenna is optimized to obtain a minimum return loss. The antenna provides the return loss better than À15 dB in almost the entire (3.1-10.6) GHz frequency band and good radiation characteristics. The simulated and experimental results are in a good agreement.

This paper describes a simple but efficient procedure for designing electrically-equivalent microstrip antennas on FR4 substrates. Radiation patterns, reflection coefficient magnitude (||), mutual coupling and cross-polarization level of probe-fed linearlypolarized antennas are calculated and discussed. Experimental results of || and radiation patterns of rectangular, elliptical and triangular patches validate the proposed procedure.

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A novel cavity-backed probe-fed linearly polarized microstrip antenna based on the concept of hybrid radiators is proposed and implemented. The resulting flush-mounted antenna exhibits symmetrical bandwidth, low cross-polarization radiation in theH-plane, due to its hybrid patch, and low cost, since it can be built on a FR4 laminate. Substrate integrated waveguide technology is used in the fabrication of the metallic cavity. The effect of mutual coupling is analyzed for two classical arrangements: the side-by-side and the collinear configurations.

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