Context. Radar scattering from meteor trails depends on several poorly constrained quantities, such as electron line density, q , initial trail radius, r 0 and ambipolar diffusion coefficient, D. Aims. The goal is to apply a numerical model of full wave backscatter triple frequency echo measurements validate theory constrain estimates radial distribution, the coefficient. Methods. A selection 5...

We report on the experimental demonstration of detuned-resonator induced transparency in the near-infrared (~800 nm) using two detuned racetrack resonators side-coupled to a bus waveguide. Both resonators and the bus waveguide are in the form of dielectric-loaded surface plasmon polariton waveguides. Leakage radiation microscopy imaging is employed to measure transmission spectra, featuring loc...

This paper presents a technique to analyze and optimize Continuously Varying Transmission Lines (CVTL’s), used to design microwave band-pass filters in planar technology. For millimeters waves, radiation losses can increase quickly, especially for sharp discontinuities in planar circuits. In this approach, rather than taking account of this effect in a full-wave analysis, we generate structures...

A broadband and broad-angle low-scattering metasurface is designed, fabricated, and characterized. Based on the optimization algorithm and far-field scattering pattern analysis, we propose a rapid and efficient method to design metasurfaces, which avoids the large amount of time-consuming electromagnetic simulations. Full-wave simulation and measurement results show that the proposed metasurfac...

We report a new type of microstrip bandpass spiral filter structure, which exhibits much smaller size than other existing miniaturized bandpass filter structures, and is particularly useful in developing hightemperature superconducting (HTS) compact filters for cellular communication systems. A prototype three-stage HTS bandpass spiral filter with center frequency of 633 MHz was designed and fa...

A high-speed low-power flash analog-to-digital converter is designed and optimized in a 0.13μm CMOS technology. The ADC consumes 65mW with a supply voltage of 1.2V at 1.2G samples per second. Static DNL and INL are 0.1 LSB and 0.2LSB respectively. The figure of merit shows 1.3pJ per conversion step. The simulation result of the full flash ADC shows improvement in nonlinearity and power dissipat...

Dispersion, impedance matching and resolution characteristics of an isotropic three-dimensional flat lens (“superlens”) are studied. The lens is based on cubic meshes of interconnected transmission lines and bulk loads. We study a practical realization of the lens, based on the microstrip technology. The dispersion equations that have been previously derived, are verified with full-wave simulat...