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This article presents the design of a novel structure to increase bandwidth of single layer dual‐polarized microstrip patch antenna using metallic cone on top of the patch antenna. The antenna is fed by two orthogonal 50Ω microstrip feedlines using λg/4 transformers. Tunable stubs are employed along the quarter‐wavelength transformer to optimize the antenna's impedance match. Results confirm the parasitic cone mounting provides significant bandwidth enhancement. The antenna was fabricated, and a good agreement is achieved between measurement and simulation. The measured results show that the antenna achieves a −10 dB impedance bandwidth of 29% and isolation of >22 dB between the two input ports across its operating bandwidth (4.8–6.44 GHz) with low cross polarization level of <20 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1599–1602, 2016

In this paper, a two-dimensional cylindrical Lens antenna based on the parallel plate technique is designed. It supports beam-steering capability of 58 0 at 28 GHz. The antenna is composed of low loss rectangular waveguide antennas, which are positioned around a homogeneous cylindrical Teflon lens in the air region of two conducting parallel plates. The Beam scanning can be achieved by switching between the antenna elements. The main advantages of our design include its relative simplicity, ease of fabrication, and high-power handling capability. Compared to previous works including a curvature optimization for the plate separation of the parallel plates, the proposed antenna has a constant distance between plates. At the 28 GHz, the maximum simulated gain value is about 19 dB. Furthermore, the designed antenna only deviates about 0.4 dB over the 58 0 scan range.Index Terms-Rectangular waveguide, lunberg lens, mm-wave, beamsteering, fan beam.

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