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In this article, a compact wideband U‐slot stacked rectangular microstrip patch antenna is designed. A low and high dielectric material combination are used to design the antenna which consists of commercial microwave substrates of Rogers TMM3 and Rohacell HF71 foam. The antenna return loss bandwidth is achieved 46.468%, centered about 4.885 GHz. The effect of parameters such as slot length and width are investigated over the antenna performance and experimentally verified. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:727–729, 2015

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In this study, a slant polariser design for directional antennas and antenna arrays is proposed. The polariser changes linear polarisation (vertical or horizontal polarisation) to slant (45°) polarisation of a directional antenna and arrays. The polariser consists of five layers that are formed by metallic strips with different angular orientations on each layer. In this way wide impedance and pattern bandwidth is obtained. Theoretical background of the polariser is examined and calculated parameters for the polariser are given. The designed slant polariser is placed in front of the horn antennas and the stacked patch antenna array. The polariser has a wide bandwidth and operates in the frequency range of 6.5–18 GHz. The performance of these polarisers are examined with simulations and verified by experimental results. Measured radiation pattern results show that the polariser successfully changes the polarisation for directional antennas and antenna array. Also, measurement results show that by using the polariser these directional antennas and antenna arrays can radiate in both two linear polarisation components (both vertical and horizontal polarisation).