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A broadband printed angled-dipole array antenna is presented in this communication. The printed two-element dipole array is fed by an adjustable integrated balun to maintain the broadband performance. The measured results show that the proposed antenna achieves 39.5% of banwidth, and stable radiation pattern with a peak gain of 4.42dBi–6.33dBi over the operating band. With the proper 45°angle of dipole...
A new type of dual-polarization and dual-frequency multilayer-stacked microstrip array antenna is introduced. The feeding mechanism of the element is the aperture coupling for one polarization and the direct feeding for the orthogonal polarization. The microstrip element exhibits a wideband of operation. A slot etched on driven patch is used to improve isolation performance of the proposed antenna...
A novel millimeter wave monopulse slotted waveguide array antenna with a central hole for infrared sensor use is presented. The amplitude distribution is optimized, and a monopulse comparator is designed to feed the proposed array. This millimeter wave array antenna has been fabricated and measured. The gain of the sum beam is higher than 32dB, whereas the zero depth of the difference beam is lower...
A new slotted rectangular waveguide array antenna is introduced, which is constructed on the conformal cylindrical surface. Unlike other slotted waveguide arrays, this array has a beam with a large tilt angle from the broadside of the linear array. The array consists of a waveguide with inclined slots cutting in the narrow wall and a matching load at one end for the traveling wave operation. The antenna...
Nanoparticles containing the infrared-to-visible up-converting phosphors (UCP) ytterbium and erbium and co-doped with sodium yttrium fluoride were synthesized with diameters ranging from 30 nm to 50 nm. These high luminescence efficient UCP beads were employed as detection labels and applied in microarrays for the detection of specific nucleic acid hybrids to identify bacteria for the first time....
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