One-Dimensional Beam Scanning Transmitarray Lens Antenna Fed by Microstrip Linear Array

Abstract

This paper proposed a one-dimensional beam scanning transmitarray lens antenna fed by a microstrip linear array antenna which owns a wide pattern in the plane orthogonal to the array axis and a narrow pattern in the plane that includes the array axis. The design principle of transmitarray lens aims to modulate a fan beam into a pencil beam by compensating phase shift of the linear array on the plane orthogonal to the array axis at X band. First, the Rotman lens feed network is used to implement nearly ±40 • one-dimensional beam scanning for the linear array with 1 × 8 microstrip antenna elements. Then, a lowprofile transmitted element with only one-layer of the substrate is utilized to design the new transmitarray lens, which can reduce fabrication expense and difficulties. After adding the transmitarray lens, maximum gain increments of 7.81 and 7.65 dB in simulation and measurement can be obtained in quasi-boresight directions, and gain increment could be obtained within ±25 • beam scanning range. Besides, the fan beams of the original linear array are smoothly transformed into pencil beams. INDEX TERMS Beam scanning, gain increment, Rotman lens, transmitarray lens.

One‐dimensional high‐gain beam‐scanning transmitarray fed by phased array with continuous electronic scan and low scan loss

“…The designs in Refs. [21, 22] achieve a scanning range of almost ±40°, but their scan loss values are not low. By contrast, the scanning transmitarray in this article achieves significant reduction of the scan loss with slight cost in the scanning range.…”

“…As presented in Refs. [19][20][21], a traditional beam-scanning transmitarray fed by the scanning array suffers from high scan loss. Now, let us explore the primary causes of high scan loss of the traditional one.…”

Quasi-Optical Multi-Beam Antenna Technologies for B5G and 6G mmWave and THz Networks: A Review

“…The principle of operation is the same as a phased array in that a progressive phase shift between adjacent elements should occur, for instance, along the x direction, or the x and y directions of the array to achieve 1D or 2D beamsteering, respectively. In this regard, several transmitarrays for beamsteering applications have been reported [101], [102]. Such designs benefit from having no feed blockage and the possibility of reducing the focal distance to obtain compact systems.…”

Design and Analysis of Antenna Feeding Networks Based on the Rotman Lens Using Interval Analysis (IA)

“…e Rotman lens is a planar structure, which can be easily implemented with microstrip technology, and it is used to feed an antenna array to obtain a multibeam behaviour; since it does not require lumped elements or other RF devices, it is simple, cheap, and mechanically robust. Despite the simplicity of the design equations, they are not able to take into account all the realworld effects, such as the material or fabrication tolerances, which can actively reduce the performance of the Rotman lens and require an expensive experimental calibration tuning [21][22][23][24][25][26][27][28][29][30][31]. e proposed method in this paper is based on the use of the interval analysis (IA) and the interval arithmetic for the design of the Rotman lens.…”