Abstract-Broadcast has been traditionally regarded as a prohibitive communication transaction in multiprocessor environments. Nowadays, such constraint largely drives the design of architectures and algorithms all-pervasive in diverse computing domains, directly and indirectly leading to diminishing performance returns as we reach the manycore era. Novel interconnect technologies could allow to revert this trend by offering, among others, improved broadcast support even in large-scale chip multiprocessors. In this position paper, the prospects of wireless on-chip communication technologies pointing towards low-latency (a few cycles) and energy-eff cient (a few pJ/bit) broadcast are outlined. This work also discusses the challenges and potential impact of adopting these technologies as key enablers of unconventional hardware architectures and algorithmic approaches, in the pathway of signif cantly improving the performance, energy eff ciency, scalability and programmability of manycore chips.

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A new quality factor (Qabs) characterising power absorption by electrically small structures ranging from antennas to lossy objects is defined. In analogy to the radiation quality factor (Qrad), which is evaluated using the antenna radiated fields in transmitting mode, Qabs is evaluated using the fields scattered by the absorbing structure. Similar to the known relationship between the antenna matching bandwidth (Bmatch) and Qrad, it is rigorously shown that for an electrically small lossless receiving antenna Qabs is inversely proportional to the absorption bandwidth (Babs) of the antenna. Based on a circuit model, it is then conjectured that the same Babs–Qabs relation is also valid in the cases of electrically small lossy antennas and objects that do not have terminals. Numerical examples are shown to demonstrate the validity of the presented Babs–Qabs relation.