Tightly Coupled Dipole Antenna Array for Wideband Scanning

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Solution Overview

Problem

Current wideband antenna arrays face challenges in achieving wide-angle electronic scanning without bulky hardware, maintaining polarization purity, and operating effectively at high frequencies due to limitations in size and cross-polarized energy levels, especially in phased array systems.

Innovation Solution

The development of broadband dual-polarized, tightly coupled dipole antenna elements and arrays fabricated using PolyStrata technology, which allows for monolithic construction, impedance matching, and capacitive coupling control, enabling efficient electromagnetic radiation and assembly into larger arrays for wideband operation beyond 20 GHz.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If frequency independent antennas such as spiral or sinuous antennas are used, then wideband operation is achieved, but the electrical size becomes too large to operate in phased arrays without causing grating lobes

Engineering Contradiction:

ImprovebandwidthVSAvoidelectrical size

Core Design Contradiction:

Duration of action of moving objectVSLength of moving object

Solution Approach 1:

The patent transforms the antenna design from conventional frequency-independent structures to resonant dipole elements with frequency-dependent characteristics. By carefully controlling the electrical length and resonance frequency of each dipole element, the array achieves wideband operation through coherent summation of resonant responses across multiple elements, rather than relying on the broadband but electrically large spiral or sinuous structures.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent divides the wideband antenna function into multiple discrete resonant dipole elements arranged in an array. Each element operates at a specific resonant frequency, and the collective response of the array provides wideband coverage. This segmentation allows each individual element to be electrically small while the overall system achieves broadband performance without the grating lobe issues of large frequency-independent antennas.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If antenna element spacing is reduced to achieve compact arrays, then space constraints are satisfied, but grating lobes appear that degrade scanning performance

Engineering Contradiction:

Improvearray footprintVSAvoidscanning accuracy

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent changes the operating principle from geometric phase scanning to resonant frequency scanning. By tuning the resonant frequency of individual dipole elements rather than relying on fixed geometric spacing, the system achieves accurate beam steering without the grating lobe problems that plague compact arrays with reduced element spacing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic frequency tuning capability to each dipole element, allowing the resonant frequency to be adjusted electronically. This dynamic parameter control enables precise beam steering and grating lobe suppression without requiring large physical element spacing, thereby achieving compact array footprint while maintaining scanning accuracy.

Inventive Principle:

Principle #15Dynamics

3Length of moving object

If tightly coupled dipole arrays are used to reduce element size, then compact arrays are achieved, but polarization purity deteriorates due to cross-polarized energy levels

Engineering Contradiction:

Improveelement sizeVSAvoidcross-polarization

Core Design Contradiction:

Length of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent employs asymmetric feed structures and non-uniform dipole geometries to control the current distribution and radiation patterns. By introducing controlled asymmetries in the feed point locations and dipole arm configurations, the system suppresses cross-polarized radiation while maintaining compact element sizes and tight coupling between elements.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies different geometric and feed characteristics to different regions of the dipole elements. By optimizing the local geometry (such as arm thickness variations, feed point positions, and end configurations) of each dipole, the system achieves improved polarization purity while maintaining overall compact dimensions and tight coupling for space-efficient array deployment.

Inventive Principle:

Principle #3Local quality

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 solution provides wideband operation with reduced cross-polarization and high-frequency capability, enabling efficient scanning up to 60 degrees with improved impedance matching and capacitive coupling, suitable for radar, communications, and electronic warfare applications.

Implementation Method 1

feed posts that are freestanding in a non-solid medium, such as air or a vacuum, and which can be configured and constructed via the PolyStrata technology to have a shape that permits impedance matching as well as control of capacitive coupling

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance