Ferrite Gooseneck Antenna Isolation for Co-Located Radio Antennas

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Solution Overview

Problem

Multi-channel radio devices experience reduced electromagnetic (EM) performance due to EM interaction between closely located antennas, and conventional gooseneck devices can exacerbate this issue by conducting EM signals, leading to interference.

Innovation Solution

A gooseneck device with a coaxial cable surrounded by ferrite elements and flexible elements is used to isolate EM signals, reducing interference between antennas by vertically spacing them and preventing EM signal leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple antennas are positioned in close proximity in multi-channel radio devices, then the device can operate multiple signal frequencies independently in a single housing, but electromagnetic interaction between the antennas causes reduced performance

Engineering Contradiction:

Improvemulti-channel operation capabilityVSAvoidantenna EM performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The gooseneck device elevates one antenna vertically above other antennas by providing a raised mounting structure. This vertical spacing in the third dimension separates the antennas spatially, reducing electromagnetic interaction while maintaining all channels within a single housing, thus resolving the contradiction between multi-channel capability and antenna performance

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The gooseneck device acts as an intermediary structure between the radio housing and the elevated antenna. It provides mechanical support and positioning that isolates the antenna from the housing and other antennas, mediating the spatial relationship to minimize electromagnetic interference while preserving multi-channel operation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a conventional gooseneck device made of metal is used to elevate an antenna, then vertical spacing is achieved to reduce interference, but the metal conductive structure can conduct EM signals and exacerbate interference

Engineering Contradiction:

Improveantenna isolationVSAvoidEM signal conduction by metal structure

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The gooseneck device changes the material parameter from conductive metal to non-conductive materials (such as plastic or polymer). This parameter change maintains the structural function of elevating and positioning the antenna while eliminating the harmful electromagnetic conduction property, thus resolving the contradiction between antenna isolation and EM interference generation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention converts the potentially harmful effect of needing a rigid support structure into a benefit by using non-conductive materials that provide both mechanical support and electromagnetic isolation. The material that would traditionally conduct EM signals is replaced with material that provides structural integrity while blocking EM conduction, turning a potential harm into a beneficial dual-function structure

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The gooseneck device effectively minimizes EM interaction between antennas, enhancing the performance of nearby antennas by isolating EM signals and maintaining signal integrity.

Implementation Method 1

The plurality of ferrite elements may be configured to reduce electromagnetic (EM) interference among the plurality of antennas

Methodology Applied

Scientific EffectElectromagnetic interference reduction: Absorption (EM radiation)

Implementation Method 2

The plurality of flexible elements may include at least one of a non-metallic material, a non-conductive material, and a compliant material

Methodology Applied

Scientific EffectMechanical flexibility: Elasticity

Data Source

PatentUS12525712B2Antenna gooseneck device and communication system to mitigate near-field effects of co-localized antennas on portable radio products and methods of use thereof

Publication Date: 2026.01.13 THALES DEFENSE & SECURITY INC

AI summary

A communication system comprising a radio device and a gooseneck device. The radio device may be coupled to a first antenna and a second antenna. A feedline gooseneck device may be coupled to the first antenna. The feedline gooseneck device may include a coaxial cable coupled between the mobile device and the first antenna and a ferrite element positioned along the coaxial cable. The ferrite element is configured to reduce EM interaction between the first and the second antenna. The ferrite element may be one of a plurality of ferrite elements and the feedline gooseneck device may further include a plurality of flexible elements positioned adjacent to each of the plurality of ferrite elements. The system allows for reduction of an amount of electromagnetic interference between the first antenna coupled to the gooseneck and the second antenna.