Single- and double-beam reflectarrays for Ka band communication

Abstract

The Ka band has found applications in satellite, and radar communications. It is also expected that this band will be utilized for 5G applications. This paper presents single-and double-beam microstrip reflectarrays with single layer and compact size for Ka band communications at 28 GHz. Three different unit cells are investigated in this paper. Single-and double-beam reflectarrays are investigated. The reflectarrays are designed at 28 GHz with a physical size of 10k 9 10k. A pyramidal horn antenna is used for the feeding purpose. The focal-length-to-diameter (F/D) ratio is equal to one. Two different scenarios for single-beam reflectarrays are presented: one with a broadside direction and the other with a 10°tilt angle. The simulation results show that for the broadside single-beam scenario, it is possible to achieve a gain up to 28.5 dB, and a 1-dB gain-bandwidth up to 30.7%. On the other hand, the presented reflectarray for the single-beam design at 10°tilt angle gives a gain of about 26.4 dB, a side lobe level (SLL) of about-15.6 dB, and a 19.3% gain-bandwidth. For the double-beam reflectarray, four different designs at different angles of 5°, 10°, 15°, and 20°have been simulated and compared. Moreover, the simulation results on the double-beam reflectarray show that the double-beam design at 10°is better from the gain and SLL perspectives. Two prototypes for broadside single-beam reflectarrays have been fabricated and measured. The measurement results show a good match with the simulation results. Gain flatness is guaranteed for both the simulated and measured results over the band of interest.

A novel broadband reflectarray for 5G satellite communications

“…The proposed concentric square split rings offer an increased phase variation of 420 over 24-32 GHz which is more compared to References [6-11] 2. The proposed RA offers a better 1-dB gain-bandwidth of 28.6% over a frequency range of 24.5-32 GHz than the RAs reported in References [5][6][7][8][9][10][11].…”

“…This RA offers 28 dBi peak gain and 10% 1 dB gain bandwidth at 30 GHz. In Reference [8], a solid cross loop enclosed within two concentric rings is utilized to design an RA resonating at 28 GHz. Multiple structures in a single unit cell provides phase range above 550 , and the RA offers an increased 1 dB gain bandwidth of 10.6% with a sidelobe level of À13.1 dB.…”

Terahertz Reflectarray Antenna with a Square Patch Surrounded by Two Concentric Square Rings as a Unit Cell

“…In the last few years, many antenna researches were conducted to improve and enhance antennas' characteristics. The Planar reflect array is one of the most important antenna categories utilized for high gain applications, which has the main advantages of parabolic reflectors and phased arrays [8,9,14]. The planar reflect array antenna system consists of a dielectric substrate sandwiched between reflect array patches and ground plan with center feeding horn antenna.…”

“…It is composed of an array of patches illuminated with a feed horn located at (Xf, Yf, Zf). The required phase delay from the feeding point to a fixed aperture in front of the reflect array must be constant for all reflect array antenna elements [9]. To collimate a beam in a certain direction in space considering that the reflection phase from each reflect array element is dependent on its position, a compensation phase γ i is required to satisfy the following equations (1, 2) [9,15].…”

Generation and Focusing of Orbital Angular Momentum Based on Polarized Reflectarray at Microwave Frequency

“…However, instead of the above designs, reflectarrays are gradually considered to be one of the practical ways for generating vortex waves in the radio frequency domain. Reflectarray can be designed to produce single or multiple beams using single-or multiple-layer configurations at different frequency bands [17]- [20]. A single-layer, dual-frequency unit for generating OAM in the microwave range for multifunctional OAM with required OAM mode, beam number, and direction was reported in [21].…”