The worldwide use of precast concrete frames leads to an increase in the need for the investigation of efficient precast connections, particularly in the seismic regions. The current paper provides a numerical and experimental study on a dry precast connection. Experiments were conducted to validate the finite element method in the laboratory of the University of Science and Culture. To verify ...

A node microstrip architecture is proposed for designing a compact Butler matrix (BM) that integrated with dual-polarized endfire antenna array. The can be used to form variety of 2 × port networks including, but not limited to, couplers and crossovers. By concatenating the together, BM any number ports formed. Using method, 4 operating in millimeter wave (mmWave) band designed size <inline-for...

This thesis presents the development of integrated silicon photonic devices. These devices are compatible with the present and near future CMOS technology. High-k horizontal grating couplers and waveguides are proposed. This work consists of simulations and device design, as well as the layout for the fabrication process, device fabrication, process development, characterization instrument deve...

In this article, a novel design approach for designing 4×4 and 8×8 filtering Butler matrices is proposed. The matrices, composed of combined 90° couplers 180° as well phase shifters, provide incremental shifts bandpass filter performance. detailed process synthesis method the are presented. A three-layer symmetrical stripline structure used to realize matrix, allowing fully planar without inter...

Novel dual-band 90◦ couplers with arbitrary power division ratios using simplified composite right-/left-handed (SCRLH) transmission lines (TLs) are proposed. With a degree of freedom in the structural parameters, a SCRLH stub can easily be tailored to imitate a conventional 90◦ section at two arbitrary frequencies with different characteristic impedances, making the resulting couplers with cus...

The imbalance and excess loss in multimode interference couplers with fabrication errors are examined. Remarkably, there exists a number of optimum access waveguide widths which give a minimum imbalance. Furthermore, quite low excess loss can be simultaneously achieved by choosing one particular optimum width. It is also shown that paired interference couplers have better imbalance performance ...

In this paper a new procedure for designing forward-wave directional couplers using periodic shunt short circuited stubs is proposed. A new type of cell using these stubs, which enlarge the phase difference between even- and odd modes of a uniform microstrip coupled line is introduced. Using the equivalent circuit model for even- and odd-modes of the proposed cell, the elements of the  ABCD tra...

Solid state beam steering devices are key elements in low cost, robust, and three-dimensional imaging systems. Here, we present a silicon photonic device based upon an 8 × grating coupler focal plane array approach fed by thermo-optic Mach–Zehnder switching tree. In this device, transmission of light from the couplers is made through backside chip using topside mirrors allowing for both high-ef...

The design of input power couplers represents one of the most important challenges of accelerators that use super-conducting RF technology. These devices must fulfil several functions while being subject to mechanical, electromagnetic, vacuum and cryogenic constraints. The rapidly increasing number of projects, planned or under construction, which propose to use super-conducting cavities has pr...