Abstract-A novel configuration for an end-wall microstrip-towaveguide splitter transition is presented suitable for use in series fed microstrip arrays. The low price, simplicity, manufacturability, low sensitivity, and also wideband operation, up to more than 37%, is the result of positive interaction between double slots and double stubs. The transition is applied to a dual band 1 × 2 array. A wideband non-tilted pattern is achieved.

A Radio Frequency (RF) probe has been fully modeled, and radiation pattern and realized gain of this probe at mm-wave frequencies have been extracted. Simulation results prove that the probe radiates with a pattern like a dipole showing a realized gain of around À8 dBi at 60 GHz, which is a huge leakage from a probe. The radiation pattern and the realized gain of the probe at 60 GHz have also been measured, confirming the simulation results. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 21:413-420, 2011.

A transition from the substrate integrated waveguide (SIW) to the microstrip line with built-in dc-decoupling is presented. The proposed transition has an interdigital configuration on a single layer. It features a 25% relative bandwidth with less than 0.7dB of insertion loss and more than 15dB of return loss.

-The problem of plane wave diffraction from the periodic structure of an infinite PEC wall lined with pyramidal absorbers is considered. A hybrid method based on the R-matrix Fourier modal method (RFMM) and the mode matching (MM) of fields is used for the efficient and robust analysis of this class of absorbers. The hybrid method benefits from the discrete spectrum of the periodic structure in transverse directions and consequently avoids spatial discretization along the periodicity axes. This leads to considerable reduction in the number of unknown coefficients. Furthermore, the method is capable of considering dispersive and inhomogeneous materials which are frequently used in the absorber industry. Several examples are outlined, simulated and measured to show the efficiency and accuracy of the method. The versatility and flexibility of the hybrid RFMM-MM technique makes it suitable for the optimal design of pyramidal absorbers to achieve further improvements in their performances.

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