Nested Radiator Antenna Structure for Wideband Impedance Matching

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Solution Overview

Problem

Micro-sized antennas face challenges in achieving wide bandwidth and impedance matching due to limited space in modern mobile communication devices, requiring innovative designs to enhance efficiency and radiation patterns.

Innovation Solution

The antenna structure incorporates a first radiator surrounded by a second radiator with predetermined distances, a short point, and a feeding point, utilizing capacitor effects to adjust impedance and increase bandwidth, with optional additional radiators and varying configurations to optimize performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If micro-sized antennas are used to reduce size, then volume is reduced, but bandwidth is limited

Engineering Contradiction:

Improveantenna volumeVSAvoidbandwidth

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent implements a nested radiator structure where a second radiator is disposed around a first radiator, with the second radiator partially surrounding the first radiator. This nested configuration allows multiple radiating elements to occupy the same spatial envelope, effectively increasing the electrical size and bandwidth without increasing the physical volume of the antenna assembly.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent transitions from planar two-dimensional radiator configurations to three-dimensional spatial arrangements by positioning radiators at different heights and orientations. The first and second radiators are disposed at different positions in space with predetermined distances between them, creating a multi-dimensional structure that enhances bandwidth while maintaining compact volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If antenna size is reduced for mobile devices, then space is saved, but impedance matching becomes difficult

Engineering Contradiction:

Improveantenna volumeVSAvoidimpedance matching precision

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent employs systematic parameter optimization by adjusting the predetermined distances between the first and second radiators, the positions of feeding points, and the dimensions of grounding elements. These parameter changes enable precise impedance matching in compact antenna structures, transforming the impedance characteristics through controlled geometric adjustments rather than requiring large physical dimensions.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional planar antennas are used, then manufacturing is simple and cost is low, but radiation patterns are limited

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidradiation pattern

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent divides the antenna into multiple independent radiating segments (first radiator and second radiator) that can be manufactured separately using conventional planar fabrication techniques. Each radiator segment maintains manufacturing simplicity while the combined three-dimensional arrangement of these segmented elements produces enhanced and more versatile radiation patterns compared to single-planar configurations.

Inventive Principle:

Principle #1Segmentation

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 significantly enhances bandwidth, achieving effective bandwidth percentages of up to 83.98% compared to conventional dual-frequency antennas, while maintaining omni-directional radiation patterns and low manufacturing costs, making it suitable for multimedia wireless communication products.

Implementation Method 1

there is a predetermined distance included between the first radiator and the second radiator for matching impedance

Methodology Applied

Scientific EffectCapacitor effect: Capacitance

Implementation Method 2

The short point is coupled between the second radiator and the grounding element

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS7911390B2Antenna structure

Publication Date: 2011.03.22 WISTRON NEWEB CORP

AI summary

An antenna structure includes a radiation element, a grounding element, a short point, and a feeding point. The radiation element includes a first radiator and a second radiator. The second radiator partially surrounds the first radiator and there is a predetermined distance included between the first radiator and the second radiator for matching impedance. The short point is coupled between the second radiator and the grounding element. The feeding point is coupled between a joint point of the first radiator and the second radiator and the grounding element.