Multi-band Radome Structure Using Layered Impedance Matching

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Solution Overview

Problem

Conventional radomes are inadequate for multi-band, broadband, high angle designs that must operate at millimeter wave frequencies, as they fail to provide sufficient strength and transparency, especially when encountering high incidence angles and multiple frequency bands.

Innovation Solution

A 4-layer sandwich radome structure comprising a structural laminate layer, an inside matching syntactic film layer, an outside matching syntactic film layer, and a second inside matching layer with low density materials like aerogel or honeycomb for enhanced microwave and millimeter wave frequency transparency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional sandwich wall is used for X-band or Ku-band operation, then acceptable performance is achieved for that specific band, but the structure becomes inadequate for multi-band operation including millimeter wave frequencies

Engineering Contradiction:

Improvemulti-band operation capabilityVSAvoidperformance adequacy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The radome wall is divided into multiple distinct layers, each with specific thickness and material properties optimized for different frequency bands. The layered structure includes an outer layer, intermediate layer, and inner layer, allowing each layer to contribute differently to the overall transmission performance across X-band, Ku-band, and millimeter wave frequencies

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The radome employs composite material construction with each layer made from specific material compositions tailored to their functional requirements. The outer layer uses materials optimized for millimeter wave transmission, while inner layers are configured for X and Ku band performance, creating a composite structure that achieves multi-band versatility without sacrificing reliability in any single band

Inventive Principle:

Principle #40Composite materials

2Shape

If the radome is designed with flattened, streamlined shapes for high incidence angles, then aerodynamic performance is improved, but transmission performance at high incidence angles and millimeter wave frequencies deteriorates

Engineering Contradiction:

Improveaerodynamic streamliningVSAvoidhigh angle transmission performance

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The radome wall structure implements local quality variations where different layers have different material properties and thicknesses optimized for specific functions. The outer layer is specifically designed with properties that maintain transmission performance at high incidence angles, while the overall streamlined shape is preserved for aerodynamic efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent addresses the high incidence angle problem by transitioning from a single-layer design to a multi-layer dimensional structure. This dimensional approach allows the radome to maintain its streamlined outer shape while using internal layering to correct transmission phase and amplitude across high incidence angles, effectively adding a structural dimension to solve the transmission issue

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If a three layer structure is used for broadband and two band performance, then acceptable performance is achieved, but the structure is inadequate for emerging three band requirements

Engineering Contradiction:

Improvethree band operation capabilityVSAvoidstructural complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multi-layer structure is designed so that each layer serves multiple functions: the outer layer provides millimeter wave transmission while contributing to overall structural integrity, the intermediate layer addresses Ku band performance, and the inner layer optimizes X band transmission. This multi-functionality allows a single radome structure to achieve three band operation capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 4-layer radome design achieves improved transmission efficiency and structural strength, enabling effective operation across multiple frequency bands with high incidence angles, meeting the demands of commercial and military airborne communication links.

Implementation Method 1

an inside matching layer adjacent to one side of the structural layer; an outside matching layer adjacent to the other side of the structural layer

Methodology Applied

Scientific EffectImpedance matching: Reflection

Implementation Method 2

an inner transmission enhancing layer for increasing broadband microwave and millimeter wave frequency transparency

Methodology Applied

Scientific EffectElectromagnetic wave transmission: Absorption (EM radiation)

Data Source

PatentUS8917220B2Multi-band, broadband, high angle sandwich radome structure

Publication Date: 2014.12.23 CPI RADANT TECH DIV

AI summary

A multi-band, broadband, high angle, sandwich radome structure including a structural layer; a first inside matching layer adjacent to one side of the structural layer; an outside matching layer adjacent to the other side of the structural layer; and a second inside matching layer for increasing broadband microwave and millimeter wave frequency transparency.