Random matrix theory (RMT) filters, applied to covariance matrices of financial returns, have recently been shown to offer improvements to the optimisation of stock portfolios. Random matrix theory filters in portfolio optimisation: A stability and risk assessment
The filters using stepped impedance resonators (SIRs are also discussed, and the effects of the coupling capacitor for an SIR structure are shown.
The input susceptances of even and odd modes and coupling coefficients are discussed. Filtering characteristics that have attenuation poles at both sides of the passband are obtained. The filtering characteristics are investigated through numerical simulations as well as experiments. A coupling capacitor is inserted into the ground plane in order to build strong coupling locally along the resonators. The filter consists of two quarter-wavelength microstrip resonators. (Auth.)Ĭomb-Line Filter with Coupling Capacitor in Ground Planeĭirectory of Open Access Journals (Sweden)įull Text Available A comb-line filter with a coupling capacitor in the ground plane is proposed. Finally, from the latter R- matrix elements, collision strengths for fine structure transitions are computed (with inclusion of both intermediate coupling and configuration mixing). From these pair coupled R- matrix elements together with a set of mixing coefficients, R- matrix elements are obtained which include the intermediate coupling and configuration mixing effects. The LS coupled R- matrix elements are transformed to pair coupling using Wigner 6-j coefficients. International Nuclear Information System (INIS)įine structure collision strength for transitions between two groups of states in intermediate coupling and with inclusion of configuration mixing are obtained from LS coupled reactance matrix elements (R- matrix elements) and a set of mixing coefficients.
Intermediate coupling collision strengths from LS coupled R- matrix elements
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