No abstract

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We developed a 10 GHz feedback oscillator with ultra-low phase noise. The oscillator was constructed to operate as the pump for the parametric transducers of the Mario Schenberg gravitational wave detector. We calculated the performance of the detector with this pump oscillator and determined how much improvement in phase noise would be necessary in order to reach the standard quantum limit in sensitivity.

In the present work, a metamaterial‐based insulator is proposed as a mean to achieve both highly compact and loosely coupled array of antennas. Its main working principle is summarized through a general qualitative analysis. The theoretical results are supported by experimental evidences. The chosen operating frequency is 2.4 GHz considering that it is a usual frequency for many indoor wireless applications. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1420–1423, 2017

This article presents the graphene as microwave absorber using polyurethane as substrate. The samples were characterized with Raman spectrometer, optical microscope, and vectorial network analyser. The results show a chemical vapor deposition‐grown graphene‐based device that can be used as microwave absorber for its unique characteristics of flexibility, transparency, light‐weight, cost‐effectiveness, and RF shielding. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:560–563, 2014