We report rigorous approach for the design of differential coupled-line directional couplers in multilayer dielectric structures. In the proposed procedure numerically calculated per-unit-length parameters of coupled transmission lines are utilized for derivation of differential couplers' properties. The known description technique with multimode scattering parameters has been extended to the e...

In this paper a transformerless Static Synchronous Series Compensator (SSSC) to increase the power capacity of a 230 kV transmission line is proposed. In order to eliminate the transformer, a 15-level cascade H Bridge (CHB) inverter is employed within the proposed compensator structure to inject reactive power to the transmission line. The theory of instantaneous p-q power using in the compensa...

A simple theory is described for the transmission of low frequency sound through the walls of rectangular ducts, particularly those in air conditioning systems. The model is based on a coupled acoustic/structural wave system, and it is assumed that the duct radiates in the same way as a finite-length line source incorporating a single travelling wave. Measurements of wall transmission loss on t...

A compact parallel-coupled-line microstrip bandpass filter with a very wideband passband and narrow notched band is demonstrated in this paper. The presented was constructed from one section of three parallel-coupled-lines which has length quarter wavelength at midband frequency 6.9 GHz. For the purpose increasing selectivity, middle line extended by quarter-wavelength connected end to ground p...

The increase of power demand has increased the need for transmitting huge amount of power over long distances. Large transmission lines configurations with high voltage and current levels generate large values of electric and magnetic fields stresses which affect the humanbeing and the nearby objects located at ground surfaces. This has in turn prompted increased activity in the documentation o...

A numerical design tool has been used to design a halfsplit CDR antenna excited by a coaxial prohe which promises improved bandwidth, radiation efficiency, and power handling capabilities as compared to conventional microstrip and slot-coupled transmission line antennas. Although results were presented only for the TEo, and HEM,, modes, other quasi-TE modes can be excited using this configuration.

We describe an optical transmission line that consists of an array of wavelength-scale optical disk resonators coupled to an optical waveguide. Such a structure leads to exotic optical characteristics, including ultraslow group velocities of propagation, enhanced optical nonlinearities, and large dispersion with a controllable magnitude and sign. This device supports soliton propagation, which ...

In this paper, design of an aperture-coupled microstrip antenna (ACMSA) using differential evolution algorithm (DE) is described. The classical transmission line model for microstrip antenna is used to determine fitness function for DE and computed results are compared with the results obtained using particle swarm optimization (PSO) and binary coded genetic