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A filtering push–pull power amplifier (PPPA) is presented based on the multifunctional impedance matching network (MIMN), which is constructed by coupled lines and open-circuited transmission lines. Due to the symmetry of designed MIMN, the even-and odd-mode method is employed to analyze the operating mechanisms, which reveal that designed MIMN can achieve high common mode suppression under the even-mode excitation, while provide good impedance transformation and filtering response under the odd-mode excitation. Finally, a filtering PPPA based on the MIMN is designed as well as measured, and the measured operating frequencies are ranging from 1.85 to 2.03 GHz. The measured maximum gain and peak power-added efficiency are 13.9 dB and 57.8%, while the measured upper stopband extends to 4.1f0 with the suppression level of 20 dB. [ABSTRACT FROM AUTHOR]

In this article, the particular importance of nanotechnology-enabled materials associated with additive manufacturing techniques for the realization of radio-frequency (RF) components and modules for Internet of Things (IoT) and millimeter-wave (mm-wave) applications is discussed. [ABSTRACT FROM AUTHOR]

We present a rapid, low-power testbed for the detection and imaging of fluorescent probes utilizing two-photon excitation fluorescence (2PEF). The 2PEF signal from fluorophores commonly used in biological imaging have been enhanced using plasmonic substrates that have been designed to have a high plasmonic resonance over a narrow band that matches the source. The samples were illuminated and imaged using a low-power, in-house multiphoton microscope. A green fluorescent protein (bfloGFPa1), chlorophyll, or rhodamine 6G were deposited onto the plasmonic substrates and their 2PEF signals were measured relative to planar samples. The fluorescence intensities from the green fluorescent protein, chlorophyll, and rhodamine were enhanced by factors of 50, 8, and 4, respectively, with the structured substrates (relative to the planar substrates). [ABSTRACT FROM PUBLISHER]