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We study the dependence of extraordinary optical transmission (EOT) on the input excitation mode by placing a metal screen with a 1D array of holes inside a parallel-plate waveguide (PPWG) operating at terahertz (THz) frequencies. We demonstrate that the output resonant frequency depends strongly on the input mode of the waveguide. We show that the surface plasmon theoretical description is invalid...
In the paper, a variable frequency constant current power supply is developed to provide the variable frequency current to vibrate the power transformer. A proportional resonant controller is applied to control the current constant. The designed experiment of vibration frequency response analysis for the 220kV transformer is made to validate the effective of the power supply. Experimental results...
It is presented a single-feed dual-frequency triangular Planar Inverted-F Antenna with U-shaped sleeves in this paper. A shorting-wall and a V-shaped slot are introduced to enhance the bandwidths in lower operating and higher operating frequency respectively. For return loss (S11) ≤-10dB, a relative bandwidth of more than 25% (2.1GHz-2.7GHz) at lower operating frequency and of more than 19.3% (4.9GHz-5...
In this paper, we present a further investigation of microstrip-fed planar UWB monopole antennas using both the numerical and experimental approaches. The focus is on the characteristic mode analysis and the optimisation of the monopole design in term of its size and S11 performance. A comparison of elliptical and circular monopoles is also conducted.
Here we report the observation of spin-selective photon emission from a resonantly driven singly charged QD. The relative frequencies of the spin-tagged photons are optically tuned via the spin-selective dynamic Stark effect.
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA). It involves the changes in different parameters to observe their effects on the antenna characteristics such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that the characteristics are affected by a number of parameters which include dimensions of ground plane, length,...
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...
This paper presents the configuration of a prototype induction cooker. Effective control scheme is incorporated in the voltage-fed H-bridge series resonant converter, which is based on an auto-frequency tracking strategy. The proposed control strategy ensures stable operation characteristics of overall converter system and ZVS (zero voltage switching) operation as well as power regulation. The operation...
Here we report the observation of spin-selective photon emission from a resonantly driven singly charged QD. The relative frequencies of the spin-tagged photons are optically tuned via the spin-selective dynamic Stark effect.
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA) involving the changes in the widths of shorting and feeding plates and feeding position under the radiating top plate to observe their effects on the characteristics of PIFA, which includes such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that feeding plate width plays...
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