Crossed Dipole Antenna Feedback Element for Isolation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional dual polarized antennas face significant challenges in achieving high port-to-port isolation due to leakage signals, especially in compact designs and extreme environments, where physical separation and impedance matching are impractical, leading to poor receive sensitivity and radiated output.

Innovation Solution

A feedback system with a conductive feedback element is positioned relative to the radiators of a crossed dipole pair antenna, generating a feedback signal to cancel leakage signals, improving isolation characteristics by adjusting the feedback element's position and amplitude, and using materials and fastening mechanisms suitable for high volume production and extreme environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If physical separation is used between antenna arrays to increase electrical isolation, then isolation between antenna elements is improved, but the space or volume required for the antenna system increases significantly

Engineering Contradiction:

Improveelectrical isolationVSAvoidspace required

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

A feedback element is introduced as an intermediary component between the transmit and receive antenna elements. This feedback element captures leaked RF signals and generates a canceling signal that is injected back into the receive path, thereby achieving high electrical isolation without requiring physical separation between antenna elements.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements a feedback mechanism where a portion of the transmitted RF signal is captured by the feedback element, processed to generate a canceling signal, and fed back to the receive port. This active feedback system dynamically compensates for leakage signals, enabling high isolation characteristics in a compact antenna configuration.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If dual polarized antennas are used to increase signal handling capacity and mitigate fading, then antenna performance in complex propagation environments is improved, but port-to-port isolation deteriorates due to leakage signals

Engineering Contradiction:

Improvesignal handling capacityVSAvoidport-to-port isolation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The feedback element monitors the transmitted RF signal and generates a canceling signal that is fed back to the receive port. This active feedback mechanism dynamically compensates for leakage signals between ports, maintaining high port-to-port isolation while preserving the dual polarization capability for diverse signal handling.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The feedback element captures the harmful leaked RF signals that would otherwise degrade isolation performance and converts them into beneficial canceling signals. By injecting these canceling signals into the receive path, the system transforms the harmful leakage into a useful mechanism for improving isolation while maintaining dual polarization functionality.

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 feedback system effectively cancels leakage signals, enhancing port-to-port isolation and antenna performance, particularly in dual band and compact antenna designs, leading to improved sensitivity and output quality.

Implementation Method 1

A feedback element for generating a feedback signal in response to a transmitted RF signal produced by each radiating elements of a crossed dipole pair, dual polarized antenna

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Data Source

PatentUS7616168B2Method and system for increasing the isolation characteristic of a crossed dipole pair dual polarized antenna

Publication Date: 2009.11.10 OUTDOOR WIRELESS NETWORKS LLC

AI summary

A method and system for increasing an isolation characteristic of a crossed dipole pair, dual polarized antenna can include a feedback system comprising a feedback element for generating a feedback signal in response to a transmitted RF signal produced by each radiating elements of a crossed dipole pair, dual polarized antenna. The feedback element may improve the isolation characteristic of RF signals between two different polarizations. The dimensions and spacing of the feedback element relative to an antenna may provide for optimal feedback signals. The feedback element can have a length, width, and thickness wherein the length and width are usually larger than the thickness dimension. A fastening mechanism of the inventive feedback system for coupling the feedback element to the antenna can include materials that allow for high speed production of antenna arrays using with the feedback system.