Conformal Slot Antenna Layout for Compact LTE Meter Enclosures

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Solution Overview

Problem

As meters become smaller and more compact, providing an antenna with good efficiency at low frequencies in a smaller housing becomes a challenge, especially when operating in LTE bands and in close proximity to metal elements like PCBs and batteries, as conventional antennas suffer from performance drops and undesired near-field coupling effects.

Innovation Solution

A multi-band conformal slot antenna with a flexible ground plane, shaped into a 'U' configuration, utilizing two or more radiating slots of equal length, made of thin flexible copper clad laminate, which maintains bandwidth and efficiency even when bent and proximate to metal elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If conventional antennas are used in small enclosures, then the meter size can be reduced, but antenna efficiency and bandwidth deteriorate due to space constraints and proximity to metal elements

Engineering Contradiction:

Improvemeter sizeVSAvoidantenna efficiency

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The ground plane is bent into a U-shape configuration, transforming the linear antenna structure into a curved form that fits within compact enclosures while preserving the electrical length required for low-frequency operation. This curvature allows the antenna to maintain its resonant characteristics despite the reduced physical space available.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The ground plane is constructed from thin flexible copper-clad laminate material that can be bent and conform to the enclosure geometry. This flexibility enables the antenna to be positioned in tight spaces without compromising its structural integrity or electrical performance, allowing efficient operation in small meters.

Inventive Principle:

Principle #30Flexible shells and thin films

2Volume of moving object

If the antenna is positioned close to metal elements like PCBs and batteries, then the enclosure size is reduced, but performance drops due to near-field coupling effects

Engineering Contradiction:

Improveenclosure sizeVSAvoidnear-field coupling effects

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The U-shaped ground plane configuration strategically positions the antenna elements to utilize the enclosure geometry and metal elements rather than treating them solely as interferers. The curved shape allows the antenna to maintain adequate electrical isolation from metal components while fitting within the constrained space, converting the potential harmful coupling into a manageable design parameter.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Shape

If the ground plane is bent into a U-shape to fit small enclosures, then the form factor is reduced, but maintaining bandwidth and efficiency becomes challenging

Engineering Contradiction:

Improveform factorVSAvoidbandwidth retention

Core Design Contradiction:

ShapeVSAdaptability or versatility

Solution Approach 1:

The antenna design maintains two or more radiating slots of substantially equal length on the bent ground plane, ensuring that the electrical parameters remain consistent despite the physical bending. This parameter preservation approach allows the antenna to retain its bandwidth and efficiency characteristics across different frequency bands while accommodating the U-shaped configuration required for small enclosures.

Inventive Principle:

Principle #35Parameter changes

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 multi-band conformal slot antenna efficiently operates in the required frequency bands (699-960 MHz and 1710-1880 MHz) within small enclosures, retaining bandwidth and efficiency despite proximity to metal elements, unlike monopole or dipole antennas.

Implementation Method 1

The antenna ground plane may include a flexible material that bends into a form factor that allows the multi-band conformal slot antenna to be positioned in an enclosure that has a length less than the length L of the antenna ground plane

Methodology Applied

Scientific EffectFlexibility: Elasticity

Implementation Method 2

two or more radiating slots of substantially equal length therein. The multi-band conformal slot antenna may operate in two or more frequency bands

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS20250132487A1Multi-Band Conformal Slot Antennas and Related Devices

Publication Date: 2025.04.24 SENSUS SPECTRUM LLC

AI summary

A multi-band conformal slot antenna is provided. The multi-band conformal slot antenna includes an antenna ground plane including two or more radiating slots of substantially equal length therein. The antenna ground plane has a length L and a width W of the antenna ground plane. The antenna ground plane includes a flexible material that bends into a form factor that allows the multi-band conformal slot antenna to be positioned in an enclosure that has a length less than the length L of the antenna ground plane.