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We have derived the general condition to achieve 100% drop efficiency in the resonant tunneling-based channel drop filters of a threeport system with reflection feedback. According to our theoretical modeling based on the coupled mode theory in time, the condition is that the Q-factor due to coupling to a bus port should be twice as large as the Q-factor(More)
OBJECTIVES/HYPOTHESIS The aim of this study was to investigate the effects of a 1.8 GHz continuous electromagnetic fields (EMF) on human nasal mucociliary transport, and to determine the pathophysiology of ciliary beat frequency (CBF) during an EMF-induced change. METHODS Human nasal mucosa cells were exposed to a 1.8 GHz EMF (SAR=1.0 W/kg), and CBF was(More)
This paper presents a broadband slot-line-fed quasi-Yagi antenna. The gap size of the coplanar stripline was designed in a staircase shape to improve the impedance matching between and the feed line and the antenna. The antenna has a broad bandwidth of approximately 55% (4–7 GHz with a reflection coefficient of less than −10 dB). The radiation(More)
Circularly polarized crossed dipole antennas are presented in this paper. A compact crossed dipole is realized with the use of a meander line and a barbed end in each dipole arm. A vacant-quarter printed ring is used as a 90° phase delay line to achieve circularly polarized radiation. For multi-band applications, each dipole arm is divided into(More)
This paper describes a low-profile broadband 2×2 metasurface-based circularly polarized (CP) array antenna using a sequentially rotated series-parallel feed. The single element is a truncated corner square patch sandwiched between the ground plane and the metasurface of a lattice of 4×4 metal plates. These antennas are incorporated with the(More)
The water distribution in human osteoarthritic articular cartilage has been quantitatively characterized using terahertz time-domain spectroscopy (THz TDS). We measured the refractive index and absorption coefficient of cartilage tissue in the THz frequency range. Based on our measurements, the estimated water content was observed to decrease with(More)
A planar, lightweight, crossed dipole antenna with circularly polarized (CP) radiation is introduced for application in a radio-frequency identification handheld reader at ultrahigh frequency bands. The dipoles cross through a 90 phase-delay line of a vacant-quarter printed ring that enables broadband characteristic in terms of impedance matching and 3-dB(More)
A circularly polarized (CP) antenna with a wideband characteristic is proposed for use in the Global Navigation Satellite System. Its primary radiation element is crossed bowtie dipoles, which are incorporated with double-printed vacant-quarter rings to allow the antenna to be matched directly to a single 50-Ω coaxial line and produce wideband CP(More)