This contribution presents the assessment of RDL technology at sub-terahertz frequencies based on polybenzoxazole (PBO) polymers. A stack of two PBO layers of 10 thickness with 3 metallization of 5 copper is being under development. Vias as small as 10 and a separation of 60 are being explored. To assess the materials and capabilities of this technology, GCPW, stripline transmission line structures are being assessed, expecting losses in the order of 1.3dB/mm and 2.1dB/mm respectively. Moreover, two resonators have been designed to enhance the accuracy of the characterization.

This communication presents a method to ease the computational burden of simulating antennas radiating close to dielectric bodies, e.g., dielectric lenses. The input impedance can be split into the capacitance of the feeding gap, a term associated with the propagation in dielectric half-space, and a term associated with the reflections created by the finite dielectric. These three terms are independent of each other and can be calculated separately. The capacitance of the feed and the term associated with radiation in the absence of the reflections can be easily evaluated. A feed with coarser detail and having the same interaction with the lens is then synthesized. This allows us to estimate the reflection from the lens efficiently, and then the different terms are recombined to estimate the total input impedance.

Multi-beam systems are a key technology for the high-speed links of the next-generation communication standards. Due to the stringent space constraints for allocating antennas on a platform, it is of paramount importance to assess - with respect to the physical size - the multi-beam performance of the antenna in terms of the maximum number of simultaneous orthogonal beams. This is done by resorting to the concept of the observable field, which is here extended to planar domains. Then, this concept is used to assess the multi-beam performance of a wideband phased array prototype developed for mobile communications. The Signal-to-Interference Ratio (SIR), computed from the measured radiation patterns of the prototype, is analyzed versus the frequency and the number of beams and compared to the benchmark case of an ideal antenna radiating the observable field.

A spectral domain analysis aimed at studying dipoles radiating in layered media is presented. The model allows for the modeling of the non-zero metal thickness and the reactance associated with a Δ-gap excitation. The solution can be efficiently calculated with a semi-analytical procedure, and it is linked to an equivalent circuit representation. The results show an accuracy up to par with commercial solvers regarding the input impedance and the radiated far field patterns.