The design and fabrication of a wideband millimetre-wave 0-dB coupler is proposed in this paper using gap waveguide technology for low-loss high-power applications 30-GHz frequency band. To overcome the challenges frequencies, technique utilised. Two waveguide-based coaxial- waveguide-fed couplers are designed with broadband performance, high return loss, acceptable coupling flatness isolation....

In two-dimensional 2D photonic crystals PC’s , we demonstrate compact optical waveguide isolators in which light can propagate only one way. Waveguides are composed of magneto-optical materials with magnetic domain walls. Magneto-optical effects and magnetic domain walls break time-reversal and spaceinversion symmetries, respectively, leading to nonreciprocal waveguides with different group vel...

recently a new structure called groove gap waveguide (GGW) is ‎introduced to implement low loss microwave component devices ‎especially for millimeter wave applications. This paper presents a ‎new type of H-plane horn antenna making use of this new technology ‎in which backward radiation is significantly suppressed by ‎introducing a high impedance surface at the antenna aperture. The ‎high impe...

here, we propose an add-drop and a channel drop filter based on two-dimensional photonic crystal all circular ring resonators. these structures are made of a square lattice of silicon rods with the refractive index n1=3.464 surrounded by air (with refractive index n2=1). the broadest photonic band gap occurs at the filling ratio of r/a = 0.17. two linear defect w1 waveguides couple to the ring....

in this article, we suggested a novel design of polarization splitter based on coupler waveguide on inp substrate at 1.55mm wavelength. photonic crystal structure is consisted of two dimensional (2d) air holes embedded in inp/ingaasp material with an effective refractive index of 3.2634 which is arranged in a hexagonal lattice. the photonic band gap (pbg) of this structure is determined using t...

We report an experimental study of discrete gap solitons in binary arrays of optical waveguides. We observe self-focusing indicating soliton generation when the inclination angle of an input beam is slightly above the Bragg angle and show that the propagation direction of the emerging gap soliton is influenced by the effect of interband momentum exchange.

A micromachined ridge gap waveguide power divider operating at 220–325 GHz is presented. The device fabricated by SUEX dry film photoresist. Dry photoresist can be used to obtain geometrical features with high accuracy using a robust fabrication process. designed has simple and wide band performance. measured transmission coefficients are equal −3.5 ± 0.4 dB the input reflection coefficient bel...

It has been previously demonstrated that it is possible to form the NOT gate in a coupled semiconductor waveguide structure in III–V materials. However, to this point, investigations have assumed the materials to be perfect. In this article, we present results of a semiconductor waveguide inverter in GaAs and InAs with disordered material effects included in the simulation. The behavior of the ...