Multi-Frequency Circular Polarized Antenna Design

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Solution Overview

Problem

Existing compact antennas struggle to achieve both multi-frequency circular polarization and lightweight design, particularly for applications in small devices like mobile handsets, due to the heaviness and complexity of ceramics with high dielectric constants.

Innovation Solution

A compact multi-frequency circularly polarized antenna design featuring two mirror-image symmetric antennas with series circuits of inductors and capacitors, positioned orthogonally and connected through inductors, to achieve the same resonant frequencies and phase difference, allowing for efficient circular polarization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a patch antenna using ceramics with high dielectric constants is used, then compactness is achieved, but weight increases and manufacturing becomes complex and expensive

Engineering Contradiction:

Improveantenna compactnessVSAvoidantenna weight

Core Design Contradiction:

Volume of moving objectVSWeight of moving object

Solution Approach 1:

The patent changes the dielectric constant parameter of the substrate material from high (ceramics) to low (printed circuit board material), thereby reducing weight while maintaining compactness through alternative design configurations involving multiple resonant frequencies and orthogonal arrangements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite structure combining printed circuit board substrate with strategically placed inductors and capacitors to achieve the desired electromagnetic performance without relying on heavy ceramic materials

Inventive Principle:

Principle #40Composite materials

2Volume of moving object

If a patch antenna using ceramics with high dielectric constants is used, then compactness is achieved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveantenna compactnessVSAvoidmanufacturing simplicity

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The patent changes the substrate material parameter from difficult-to-manufacture ceramics to easy-to-manufacture printed circuit board materials, simplifying the manufacturing process while maintaining compactness through circuit design optimizations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical/ceramic substrate-based compactness approach with an electrical/circuit-based approach using inductors, capacitors, and printed circuit board traces to achieve the same compact multi-frequency performance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Volume of moving object

If a compact multi-frequency antenna is designed, then size is reduced, but circular polarization capability is lost

Engineering Contradiction:

Improveantenna sizeVSAvoidcircular polarization capability

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent divides the antenna system into two separate resonant structures (first and second resonant circuits) with different orientations, each contributing to different polarization components, which when combined produce circular polarization in a compact form

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a third dimension through vertical stacking or orthogonal arrangement of resonant circuits, allowing circular polarization to be achieved in a compact planar or semi-planar configuration without requiring large aperture areas

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design enables a lightweight, compact, and efficient multi-frequency circularly polarized antenna capable of operating at multiple resonant frequencies, suitable for small devices, with improved manufacturing simplicity and cost-effectiveness.

Implementation Method 1

a first antenna with multiple resonant frequencies, comprising a first input/output terminal, a first antenna conductor, a series circuit of a first inductor and a first capacitor connecting the first input/output terminal and the first antenna conductor

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

the first multi-frequency antenna and the second multi-frequency antenna are positioned so as to intersect substantially orthogonally at a center point

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS9093757B2Antenna

Publication Date: 2015.07.28 CASIO COMPUTER CO LTD

AI summary

A multi-frequency circularly polarized antenna (100) comprises a substrate and multi-frequency antennas (900, 901). The multi-frequency antennas (900, 901) comprise antenna elements (120, 220, 30, 420), shunt-inductor conductors (170, 270, 370, 470), series-capacitor conductors (160a, 160b, 260a, 260b, 360a, 360b, 460a, 460b), series-inductor capacitors (140, 240, 340, 440), a center point (199) and input/output terminals (1q0, 210, 310, 410). The multi-frequency circularly polarized antenna (100) is constructed by connecting the shunt-inductor conductors (170, 270, 370, 470) of the multi-frequency antennas (900, 901) at the center point (199) in a substantially perpendicular manner.