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The radiation from dipole atoms situated in a general loss-less electromagnetic environment is studied in a fully quantized model by direct factorization of the Hamiltonian. The factorized Hamiltonian feature coupled excitations of the atoms and fields.
A novel coupled-line (CL) matched negative group delay (NGD) circuit is proposed in this paper. By loading two grounded resistors in coupling and isolation ports of CL, the presented circuit could be designed to realize the allpass bandwidth and NGD characteristic. In addition, the NGD circuit is capable of achieving input-to-output impedance transformation. To verify our proposed design, a typical...
A predictive time-domain (TD) analysis of near-field (NF) coupling for complex shape wiring system is reported. Based on the Taylor model, methodological approach enabling to determine the transient voltage coupling induced by electromagnetic (EM) near-field action on the metallic wiring structure is presented. The basic steps indicating how the coupling time-dependent voltages were calculated are...
A Ka-band waveguide-fed longitudinal slot array designed as a phased array to achieve a ±8° E plane beam scan is presented. A three-layer structure, which is easy to fabricate, has been applied to produce the array. The measured results show that, the array possesses a high gain of more than 34.5dBi in the entire scan range and shows an aperture efficiency of more than 54%. The measured E plane side...
A tunable optical filter comprised of two paralleled identical long-period waveguide gratings is design and simulated. The simulation results show that the tuning range from 1530 nm to 1560 nm, and the FWHM can reach 0.8 nm.
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