The 2D Linearly Polarized Near-Field Focusing Based on Angularly Discretized Slot Arrays

TL;DR

This paper introduces a 2D near-field focusing method using angularly discretized slot arrays on circular waveguides, achieving linearly polarized focus with minimal cross-polarization, validated through full-wave simulations.

Contribution

It extends beam-focusing principles to 2D angularly discretized configurations with a novel slot arrangement, enhancing polarization control in near-field focusing.

Findings

Achieved linearly polarized near-field focus with negligible cross-polarization.

Validated the design through comprehensive full-wave simulations.

Demonstrated effective 2D beam-focusing using circular slot arrays.

Abstract

A 2-D near-field focusing design is proposed based on the circular slot array waveguide structures, synthesized using the array-factor theory, and demonstrated by full-wave simulations. The principle of beam-focusing is extended to the 2-D angularly discretized configuration using regular center-fed linear slots arranged in a circular pattern. By the mirror image arrangement of the slots, a linearly polarized focus in the near-field of the antenna, with negligible cross-polarization is achieved. Its beam-focusing properties are discussed in details and demonstrated by simulations.