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AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K–70 K) and ac field amplitude ( $\leq$ 0.2 T) as well as frequency (20 Hz–2 kHz) , this work shows (1) the full coupling of the non-twisted wire, (2) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (3) a relatively short time constant...
Silicon slot waveguides that can operate at the wavelength of high material absorption are prepared on SOI wafer. The measured transmission loss coefficient could be as low as 1.07–2.62dB/mm at the wavelength of 1064nm.
A compact conformal planar inverted-F antenna (PIFA) array, working at UHF band, is presented in this paper. This array consists of four PIFA elements. The parallel feeding network has been designed to drive the elements. The size of the proposed array is 100.5 mm × 48 mm. The proposed antenna is fabricated on a very thin substrate with a thickness of 0.254 mm, which is benefit for conformal structure...
Over the past 10 years or so, many broadband and ultra-wideband antennas have been developed for broadband high data rate mobile communications. It is realized how to make efficient and accurate measurements for such antennas could be a challenging issue. In this paper, we examine the antenna efficiency measurement techniques which have been used up to now, and identify their advantages and disadvantages...
Recently, Wheeler cap method was extended to measure wideband antennas. This paper presents an investigation on the effects of the loss of wheeler cap on antenna efficiency measurement results. Two caps/cavities (one large and one small) are employed for this study and numerical simulation is also conducted to aid the analysis. Both the experimental and numerical results show the loss due to the imperfection...
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