A beam-steerable wideband reflectarray antenna (WRA) for C -band high-power microwave (HPM) application is presented in this paper. The WRA made up of a multimode conical horn with high power handling capacity (PHC), 25×25 special designed elements, metal frame and dielectric plate as radome. I...

A terahertz vertical-external-cavity surface-emitting-laser (VECSEL) is demonstrated using an active focusing reflectarray metasurface based on quantum-cascade gain material. The focusing effect enables a hemispherical cavity with flat optics, which exhibits higher geometric stability than a plano-plano cavity and a directive and circular near-diffraction limited Gaussian beam with M2</sup...

Techniques for numerical analysis and equivalent circuit modeling for loss performance of reflectarray antennas are presented in this paper. Numerical equations are employed to find out the values of reflection loss at resonant frequency and a novel set of predictions is applied to acquire the reflection loss curve for different materials. Equivalent circuit modeling using lumped components has...

A bandwidth improvement method in reflectarray antennas by using closely space elements, i.e., unit-cell sizes smaller than λ/2, has been investigated both numerically and experimentally in this paper. A new definition of phase error has been introduced to analyze the broadband mechanism of closely spaced phasing elements. Through full wave EM simulations, it is revealed that closely spaced ele...

In this communication, a dual-band shared aperture antenna is presented. The proposed achieves operation by housing both low-frequency patch array and high-frequency reflectarray in the same area. two different types are combined into single-antenna product without any significant performance loss. has layered structure that allows to have sufficient impedance bandwidth realized gain. since uni...