Beam Switching Cylindrical Array Antenna System for Communication

Abstract

The beam switching cylindrical array, which is a unique system, has been designed and developed to cover 3600 in azimuth plane by generating 16 beams with specified elevation coverage. In this design, the concept of fast aperture selection (4 x 4) in microseconds from the total cylindrical array has been realised successfully to meet the requirement of point-to-multipoint communication. The components of the array, viz., radiating elements, powder dividers, switches, etc., are designed in printed circuit type, and hence, objectives of lightweight and ease of reproducibility are achieved. The lightweight of the array makes it accessible for easy mounting at a specified height for achieving longer communication range. Finally, a low-Ioss radome is incorporated to protect the array from environmental conditions. The various paramete"rs, viz., return loss, gain, and switched-beam radiation patterns were measured over a bandwidth of 300 MHz in L-band and typical measured results are presented in this paper.(ii) beam scanning is nearly continuous by using the phase shifters, which makes the antenna system complex arid costlier3. As the requirement of scanning is to generate a fixed beam in azimuth and also narrow beam in elevation planes, the cylin'drical array with 64 elements arranged in 4 rows and 16 columns (4 x 16) is considered, which provides moderate gain. A software for uniform distribution was developed to stud)\ .the effect of interelement spacing of cylindrical array, which reveals similar results4. Finally, the cylindrical array covering 20 per cent bandwidth in L-band has been designed and developed. The mutual coupfing effects were also studied experimentally5. The concept of fast selecting aperture in co-phasal condition for appropriate beam is implemented successfully. The antenna is housed in a low-Ioss, lightweight sandwich radome and is evaluated in azimuth and elevation planes in small steps of

Beamforming for Rotated 3D Multipanel Array Structures for 5G NR MIMO Transmission

“…Although the performance gap between two array structures decreases as the cell size increases, a significant amount of power gain can be observed over the entire range of cell radii. Digital beamforming only in the figure refers to the case when subarray beam tilting is not applied, showing a severe performance degradation compared to the hybrid beamforming with full phase compensation described in (22) applied. The amount of power gain of the proposed structure over the conventional array is in the range from 5 to 10dB when hybrid beamforming is used for cell size 60m or less.…”

“…which can be applied to (22). Beamforming vector w is then obtained to coherently direct the signal to the target UE.…”

“…Attempts have been made to improve the beamforming and transmission efficiency by using antenna arrays in different shapes. In [18][19][20], uniform circular arrays (UCAs) to mitigate the interference at the sector boundary have been investigated, which are extended to the cylindrical shape to conduct vertical beamforming in addition to horizontal beamforming [21,22]. Vertical beamforming for small cells using the millimeter-wave has been studied in [23][24][25].…”