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We report for the first time a planar quasi-Yagi antenna printed on a single layer of high dielectric constant substrate (Duroid, ε r =10.2) which measures 48 % bandwidth (VSWR<2). The antenna radiates an end-fire beam, with a front-to-back ratio >15 dB and cross polarization level below –12 dB across the entire frequency band. A very low mutual coupling… (More)
Vacuous chewing movements (VCMs) in three different rat strains developed at considerably different rates after 19 weeks of continual haloperidol treatment at an average daily dose of 1.5 mg/kg. Sprague Dawley (SD) rats displayed relatively high rates of VCMs with low variability, compared to Wistar (W) and Long Evan (LE) rats. Atropine decreased but did… (More)
A novel microstrip-to-waveguide transition utilizing coplanar strips Yagi-like antenna is presented. The X-band transition demonstrates about 40% bandwidth with return loss better than-12dB. This transition should find wide applications due to its high compatibility with MIC/MMIC technology at very low fabrication cost.
The acute effect of 1-methyl-4-phenylpyridinium ion (MPP+), a neurotoxin derived from 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP), was examined by the in vivo micro-dialysis technique. A dialysis cannula was implanted into rat striatum, and the changes in the concentrations of dopamine (DA), 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic… (More)
— In this paper, the finite-difference time-domain (FDTD) method is applied to calculate the resonant frequency of dielectric res-onators (DR's) with curved surface. The contour-path integral FDTD (CFDTD) is modified to deal with the curved surface of the dielectric body while the traditional rectangular cells are maintained. Results are compared with… (More)
In this paper, we propose and develop a partially shielded tunable filter structure using a varactor-loaded split-ring resonator. The novel physical topology of the filter is suitable for vertical stacking of filters and enables a compact multilayer tunable filter for applications requiring a very wide tuning range. The capacitance range and ratio needed to… (More)
A novel CPW-to-waveguide transition utilizing a uniplanar quasi-Yagi antenna is presented. The X-band back-to-back transition demonstrates 33% bandwidth with return loss better than-10dB. This transition should find a wide variety of applications due to its high MIC/MMIC compatibility and low cost.
—Millimeter-wave generation by photomixing at 1.55 m in long-wavelength velocity-matched distributed pho-todetector (VMDP) is experimentally demonstrated. The VMDP exhibits a dc responsivity of 0.25 A/W, a breakdown voltage of 7–9 V, and up to 15-mA dc photocurrent without damage. Millimeter-wave output powers of 21 dBm at 75 GHz and 24 dBm at 95 GHz were… (More)