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Rolling bearings are an important part of wind turbine systems. Shaft current induced damages are one of the main causes for bearing failures, which lead to considerable operation loss of wind turbine plants. In this paper, the characteristics of shaft current damages and their induced vibration responses are studied analytically. Then it suggests to use an emerging Modulation Signal Bispectrum (MSB)...
A new frequency and pattern reconfigurable antenna is proposed in this paper. Both frequency and pattern reconfigurations are effectively realized by using the microstrip double fed ports and four PIN diodes on the annular slot. At the low frequency band (1800MHz) and high frequency band(2400MHz), the antenna has four different patterns which are almost omnidirectional scanning and can be used to...
In this paper, a single-layer bandpass frequency selective surface (FSS) is proposed for L-band applications. The FSS unit cell consists of an improved hexagonal aperture unit embedded with H-shape slots. Simulated results show that the FSS obtains good frequency selective performance. Its relative bandwidth is about 55.7% using −3 dB as the criteria for the transmission coefficient. Moreover, the...
A multiband MIMO antenna for USB dongle in LTE operation has been presented in this paper. The two unit antennas are placed identically and symmetrically on two same plastic carriers located at the top edge of the ground, each of which is 25mm×12mm. The unit antenna is designed to operate in dual zeroth-order resonant modes, to cover the lower-band at LTE band 13 (746–787MHz), conventionally GSM850/900...
In this letter, a compact stacked shorted patch antenna is proposed using low temperature cofired ceramic (LTCC) technology. The height of the antenna is decreased due to the shorted pin, and this greatly improves the polarization performance of the antenna. At the same time, the height (about λ /25) of the antenna and its polarization state are determined by both the feeding and the shorting pin...
A novel method of designing broadband microstrip antenna is proposed in this paper. By embedding a pair of Cross-shaped slots placed close to the non-radiating edges of a microstrip patch and adding an air layer between the substrate and the ground, the broadband character can be achieved. What's more, the formulas for calculating the two resonant frequencies have been experimentally deduced. Employing...
In this paper, we report our experimental and numerical results, confirming the phenomenon of dual in-phase reflection, i.e. dual-resonant behavior, for a TM-polarization plane wave oblique incidence on the conventional mushroom-like EBG structures. A modified local resonance cavity (MLRCC) model of EBG structures has been presented to explain the essential features of dual- resonant behavior and...
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