Wide Band PCB Patch Antenna with Secondary Resonators

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Solution Overview

Problem

Classic patch antenna designs typically have a narrow frequency band, leading to high costs due to the need for expensive and thick dielectric materials to mitigate bandwidth variations, which affects temperature stability and aging.

Innovation Solution

The method involves constructing a large bandwidth PCB patch antenna by adding two non-connected secondary resonators on either side of a main resonator, with the secondary resonators having specific frequencies and coupling factors to achieve a wider bandwidth without compromising antenna characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If classic patch antenna designs use narrow frequency band resonators, then the antenna structure is simple, but the bandwidth is limited and expensive thick dielectric materials are required

Engineering Contradiction:

Improveantenna structureVSAvoidbandwidth

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The antenna is segmented into a main resonator and multiple secondary resonators that are not directly connected to each other. Each resonator operates at a different frequency, with the first secondary resonator at frequency f1 and the second secondary resonator at frequency f2. This segmentation allows independent optimization of each resonator's characteristics while achieving overall bandwidth expansion through their combined effect.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from a single-frequency resonator design to a multi-frequency resonator system by adding resonators at different frequency dimensions. The first secondary resonator operates at frequency f1 and the second at frequency f2, creating a multi-dimensional frequency response that expands the overall bandwidth without requiring thick dielectric materials.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If thick dielectric materials are used to facilitate larger bandwidths, then the bandwidth increases, but the manufacturing cost and material requirements increase

Engineering Contradiction:

ImprovebandwidthVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention changes the frequency parameter distribution by introducing secondary resonators at frequencies f1 and f2 that are different from the main resonator frequency. This parameter change in the frequency domain achieves bandwidth expansion without requiring changes in the physical thickness parameter of the dielectric material, thereby reducing manufacturing costs.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If expensive stable dielectric materials are used to prevent antenna characteristic variations, then the temperature stability improves, but the manufacturing cost increases

Engineering Contradiction:

Improvetemperature stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By segmenting the antenna into multiple resonators operating at different frequencies, the system achieves frequency diversity that makes it less sensitive to temperature-induced frequency shifts. This segmentation approach provides inherent robustness against environmental variations, reducing the need for expensive high-stability dielectric materials.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If two non-connected patches are added on either sides of a rectangular patch antenna, then the antenna bandwidth significantly increases, but the device complexity increases

Engineering Contradiction:

Improveantenna bandwidthVSAvoidantenna structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The secondary resonators are extracted as separate, non-connected patches from the main resonator structure. This extraction allows each resonator to be independently designed and positioned at optimal locations (first at frequency f1, second at frequency f2), simplifying the overall design process while achieving bandwidth expansion through their combined frequency responses.

Inventive Principle:

Principle #2Taking out (Extraction)

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 approach significantly increases the antenna bandwidth while maintaining efficiency and directivity, allowing for the use of thinner, cheaper dielectrics and reducing manufacturing costs without adverse effects on antenna performance.

Implementation Method 1

constructing an initial antenna patch comprising a main resonator, adding a first secondary resonator, adding a second secondary resonator

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

coupling the first secondary resonator and the second secondary resonator

Methodology Applied

Scientific EffectCoupling:

Data Source

PatentUS10069202B1Wide band patch antenna

Publication Date: 2018.09.04 FLEXTRONICS AP LLC

AI summary

A large bandwidth pcb patch antenna comprises an initial antenna patch comprising a main resonator, a first secondary resonator, a second secondary resonator, resonator, and wherein the first secondary resonator and the second secondary resonator are coupled together. By adding two non-connected patches on either sides of a rectangular patch antenna, a significantly larger antenna bandwidth is achieved and without loss of other characteristics.