Multi-band Antenna Common Junction Feed Structure

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Solution Overview

Problem

Conventional multi-band antenna systems face challenges in achieving a compact size, high efficiency, and low Voltage Standing Wave Ratio (VSWR) due to complex feed networks and radiating structures, which limit their performance in wireless communication devices.

Innovation Solution

A multi-band antenna system utilizing a common junction RF network with at least two radiators and a resonant network that couples between them, allowing for the creation of additional frequency bands with minimal components and interconnections, thereby reducing complexity and size while maintaining high efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional multi-band antenna systems use multiple arrays of radiating elements and adjoining corporate feed structures for each frequency band, then frequency coverage is improved, but antenna size and device packaging area increase significantly

Engineering Contradiction:

Improvefrequency coverageVSAvoidantenna packaging area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent combines multiple radiating elements (first and second radiating elements) into a single integrated antenna structure that shares common feed structures. This merging allows the antenna to operate across multiple frequency bands (first, second, third frequency bands) without requiring separate antenna arrays for each band, thereby reducing the overall packaging area while maintaining multi-band functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The antenna structure is designed with multi-functionality where the same radiating elements and feed structures serve multiple frequency bands. The first radiating element can operate in both the first and third frequency bands, while the second radiating element operates in the second frequency band, allowing a single antenna structure to perform multiple frequency coverage functions that would traditionally require separate antenna systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If conventional PIFA antennas are modified by splitting the radiating plane into two separate frequency bands, then frequency band coverage is improved, but antenna voltage standing wave ratio and radiating efficiency deteriorate

Engineering Contradiction:

Improvefrequency band coverageVSAvoidantenna VSWR and radiating efficiency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the antenna into distinct radiating elements (first and second radiating elements) with different geometries optimized for specific frequency ranges. The first radiating element is configured for lower frequency bands while the second radiating element is configured for higher frequency bands. This segmentation allows each element to be independently optimized for its designated frequency range, maintaining good VSWR and radiating efficiency across all bands without the performance degradation associated with uniform splitting approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the antenna structure are given different local qualities through varying the geometry, size, and configuration of the first and second radiating elements. The first radiating element has dimensions and shape characteristics optimized for the first and third frequency bands, while the second radiating element has characteristics optimized for the second frequency band. This local optimization ensures that each part of the antenna performs efficiently in its designated frequency range.

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 enables efficient communication across multiple frequency bands with improved radiating efficiency and reduced VSWR, making it suitable for compact wireless devices without the need for additional radiator elements or complex feed structures.

Implementation Method 1

A resonant network couples between them, allowing for the creation of additional frequency bands with minimal components and interconnections

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

a resonant network couples between them

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Data Source

PatentUS7589678B2Multi-band antenna with a common resonant feed structure and methods

Publication Date: 2009.09.15 L K PROD OY

AI summary

A multi-band antenna and associated apparatus for communication systems and other applications. In one embodiment, a common junction network is provided having a first and a second radiator. The first radiator resonates in a first frequency band. The second radiator resonates in a second frequency band. The first and second frequency bands are different from one another (yet may overlap). A first electrical component is coupled to the common junction network and proximately located to the first radiator. The first electrical component creates a resonance with the common junction network to create a third frequency band proximate to the first frequency band. The first radiator is capable of communicating RF energy in the first frequency band and the third frequency band.