This paper presents a single layer multi-band reflectarray antenna with circular polarization. The antenna geometry and operation principles are described. The reflectarray design procedure, including antenna elements and offset feed, is illustrated in details. An X band reflectarray prototype is fabricated and measured in the near field system, which realizes a 30.4 dB gain, 53.7% efficiency, ...

Progressive phase distribution is an important consideration in reflectarray antenna design which is required to form a planar wave in front of the reflectarray aperture. This paper presents a detailed mathematical model in order to determine the required reflection phase values from individual element of a reflectarray designed in Ku-band frequency range. The proposed technique of obtaining re...

The emerging field of communications has increased the demand of electronically tunable reflectarray antennas. Substrate material properties play at1 important role in the design of reflectamy antennas. Variable permittivity materials such as liquid crystals and fenoelectrics have received great deal of attention due to their non-linear material properties. A comparative analysis behveen the pr...

Regularly shaped compact microstrip antennas have a small size but their gain is insufficient for most applications. Therefore, a ring-shaped compact microstrip reflectarray with microstrip antenna feed has been proposed. Different configurations, namely, 1 × 3, 3 × 1, plus-shaped and 3 × 3 have been analyzed. The 3 × 3 configuration yields an optimum gain of 10. 8 dBi and a narrow beamwidth of...

Dual-reflectarray configurations exhibits some advantages from both mechanical and electrical points of view with respect to reflector antennas. Dual-reflectarray antennas present a reduced volume and the capability of being easily folded. Furthermore, these antenna configurations provide phase control on both reflectarray surfaces [1], which can be used to improve the antenna performance for m...

A reflectarray antenna composed of more than 87000 single-crystal silicon resonators on a gold ground plane is experimentally demonstrated to achieve efficient beam focusing at 1 THz. The functionality of the reflectarray as a collimator is also verified by the principle of antenna reciprocity. Because of the low-loss and nondispersive nature of high-resistivity silicon in the submillimeter reg...

In the design procedure of a reflectarray antenna system, the aperture efficiency needs to be first analyzed to forecast the system performance. This article investigates the effects of the reflectarray configuration parameters on the antenna aperture efficiency. A general approach is introduced to calculate the spillover efficiency of a reflectarray with arbitrarily shaped aperture and feed sc...

A microstrip reflectarray is a flat reflector antenna that can be mounted conformally onto a spacecraft’s outside structure without consuming a significant amount of spacecraft volume and mass. For large apertures (2 m or larger), the antenna’s reflecting surface, being flat, can be more easily and reliably deployed than a curved parabolic reflector. This article presents the study results on a...

Dual-Band Reflectarrays Using Microstrip Ring Elements and Their Applications with Various Feeding Arrangements. (August 2006) Chul Min Han, B.S., Korea University Chair of Advisory Committee: Dr. Kai Chang In recent years there has been a growing demand for reduced mass, small launch volume, and, at the same time, high-gain large-aperture antenna systems in modern space-borne applications. Thi...

Reflectarrays composed of resonant microstrip gold patches on a dielectric substrate are demonstrated for operation at terahertz frequencies. Based on the relation between the patch size and the reflection phase, a progressive phase distribution is implemented on the patch array to create a reflector able to deflect an incident beam towards a predefined angle off the specular direction. In orde...