A wideband digital polarization synthesis method

Abstract

A novel wideband digital polarization synthesis method is presented here. The method is based on the definition of antenna polarization and both simulated and measured antenna patterns. A mathematical formulation is used to determine the synthesis coefficients. Any state of polarization (elliptical, circular, and linear) can be synthesized theoretically. Here, we mainly focus on the method for synthesizing linearly polarized antennas into circularly polarized antennas. There is no restriction regarding the array geometry or element patterns. The method can yield pure circularly polarized antenna patterns within the whole working band. The synthesized circularly polarized antennas are then used to receive circularly polarized signals. The method can provide more accurate polarized data for wideband solar radio observations and other systems that require accurate polarization measurements.

Design of a high-resolution antenna array solar observing system for radio frequencies of 25–110 MHz

“…The commonly used polarisation synthesis method is to use a 3-dB 90 • hybrid coupler. However, the hybrid coupler has the best effect at the centre frequency, and the phase difference at the sideband frequency is the largest, which results in inconsistent phase differences at different frequencies (Das et al 2010;Zhang et al 2018). This would greatly affect the subsequent data processing, especially the pointing accuracy of digital beamforming and the quality of solar radio observation data.…”

Digital Polarization Programmable Metasurface for Continuous Polarization Angle Rotation and Radar Applications

“…The traditional polarization rotation methods are realized using optically active crystals (Elston et al, 1991;Yokoyama and Noda, 2003) and the Faraday effect (Argyres, 1955;Meissner and Wentz, 2006) These methods usually need a long transmission distance to obtain phase accumulation, which results in bulky device volume, high manufacturing cost, and difficult integration (Xu et al, 2011;Mutlu and Ozbay, 2012;Shi et al, 2012). A novel digital polarization synthesis (DPS) method is developed to control polarization precisely (Zhang et al, 2018). This method, however, has a high cost.…”