Fracol Radiator for Millimeter Wave Antenna Arrays

The Fracol radiator addresses PCB design constraints by using a multi-layer PCB structure with metal and dielectric layers and balanced transmission lines, enhancing wideband performance and radiation characteristics for millimeter wave applications.

WO2026125918A1 Publication Date: 2026-06-18TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Filing Date
2024-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing antenna elements with laminated dielectric layers using drilled or micro-vias are limited by PCB design constraints, which hinder achieving good wideband performance at millimeter wave frequencies due to radiator dimensions becoming very small and dielectric material limitations.

⚗Method used

A millimeter wave Fracol radiator structure comprising a multi-layer printed circuit board (PCB) with metal layers and dielectric layers, featuring petals and vertical structures connected via vias, and a feedline structure with balanced broadside coupled transmission lines to optimize performance while minimizing complexity.

🎯Benefits of technology

The Fracol radiator achieves improved wideband performance and radiation characteristics, suitable for millimeter wave applications, with reduced complexity and enhanced S-parameter and radiation pattern performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

Embodiments of a millimeter wave Fracol, radiator. The Fracol radiator includes a radiator structure and a feedline structure. The radiator structure comprises a plurality of metal layers interposed between respective dielectric layers. The metal layers define: respective petals of the Fracol Radiator, each petal including a leaf portion on a first metal layer, and a vertical structure connected to a peripheral edge of the leaf portion and extending through one or more of the metal layers and dielectric layers; and electrical connections between the respective leaf portion of each petal and a corresponding contact pad. The feedline structure includes at least one broadside coupled transmission line having a respective pair of strip lines, each strip line being electrically connected to a respective contact pad of the radiator structure.
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