Segmented Dipole Antenna Layout for Low-Band Co-Location

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Solution Overview

Problem

Existing antenna arrangements with co-located antennas operating at different frequency bands face interference issues, particularly when a low-frequency antenna is placed in front of a high-frequency antenna, leading to performance disturbances and manufacturing challenges.

Innovation Solution

The second antenna is designed as a 'chopped dipole' with reactive loading between segments, allowing it to be electrically invisible to the first antenna by segmenting it into electrically conductive sections and using inductive load sections like meandering lines or planar spiral coils, which maintain its operational capability without disturbing the first antenna.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the second antenna is placed in front of the first antenna to optimize space and minimize overall size, then the antenna arrangement becomes more compact and space-efficient, but the second antenna disturbs the operation and performance of the first antenna

Engineering Contradiction:

Improveoverall size of antenna arrangementVSAvoidperformance of first antenna

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The second antenna is segmented into multiple electrically conductive sections with reactive loading between them, creating a chopped dipole structure. This segmentation allows the antenna to be electrically small at the first antenna's operating frequency while maintaining its operational capability at its own frequency band, thereby reducing disturbance to the first antenna

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The antenna structure modifies its electrical parameters through reactive loading (inductive or capacitive) between segmented sections. This changes the electrical length and impedance characteristics, making the second antenna electrically invisible or transparent to the first antenna's operating frequency while preserving its own resonant operation

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If the second antenna is placed in front of the first antenna to co-locate antennas, then space utilization is improved, but the disturbance to the antenna pattern becomes severe especially for high sidelobe performance requirements

Engineering Contradiction:

Improvespace utilizationVSAvoidantenna pattern disturbance

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

By dividing the second antenna into multiple small electrically conductive sections rather than using a continuous structure, the chopped dipole reduces its effective electrical size at the first antenna's frequency. This segmentation minimizes the antenna's interaction with and disturbance to the first antenna's radiation pattern, preserving sidelobe performance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reactive loading elements serve as intermediaries between the segmented electrically conductive sections. These intermediaries transform the electrical characteristics of the second antenna, making it transparent to the first antenna's operating frequency while maintaining the second antenna's own resonant operation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a chopped dipole structure with reactive loading is used for the second antenna, then the second antenna becomes electrically invisible to the first antenna, but the device complexity increases

Engineering Contradiction:

Improveelectrical invisibility of second antennaVSAvoidantenna structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reactive loading elements are integrated directly into the antenna structure, merging the segmentation function and impedance transformation function into a unified chopped dipole design. This combining approach achieves electrical invisibility while minimizing the number of separate components and simplifying the overall structure

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration minimizes interference between the antennas, ensuring the first antenna operates without disturbance while maintaining the second antenna's performance, and allows for a cost-effective, compact arrangement.

Implementation Method 1

each electrically conductive section is coupled to an adjacent electrically conductive section by a reactive load section

Methodology Applied

Scientific EffectReactive loading: Capacitance

Implementation Method 2

The segmented dipole structure having electrically conductive sections allow the second antenna to be 'invisible' from the view of the first antenna

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12609453B2Antenna arrangement

Publication Date: 2026.04.21 SAAB AB

AI summary

The present disclosure relates to an antenna arrangement including a first antenna configured to operate within a first frequency band and a second antenna configured to operate within a second frequency band. The first frequency band is higher than the second frequency band. Further, the second antenna is at least partly arranged within an illumination-field of the first antenna. Furthermore, the second antenna includes a dipole structure segmented into a plurality of electrically conductive sections, wherein each electrically conductive section is coupled to an adjacent electrically conductive section by a reactive load section.