Grid Reflector Base Station Antennas for Multi-Band Heat Control

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Solution Overview

Problem

Existing base station antennas face challenges in efficiently managing multiple frequency bands and heat dissipation, particularly with the integration of passive and active antenna modules, which can lead to overheating and inefficient signal propagation.

Innovation Solution

The implementation of a base station antenna with a grid reflector and frequency selective surfaces (FSS) that segregate and manage different frequency bands, allowing high-band radiating elements to propagate through while reflecting lower-band signals, and incorporating a dielectric cover for improved heat dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If passive and active antenna modules are integrated in a base station antenna, then multi-band signal propagation capability is improved, but heat dissipation becomes problematic leading to overheating

Engineering Contradiction:

Improvemulti-band signal propagation capabilityVSAvoidheat dissipation

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The base station antenna is divided into separate passive and active antenna modules, each handling different frequency bands. The passive module processes lower frequency bands while the active module handles higher frequency bands, allowing independent thermal management for each module and preventing heat accumulation in a single integrated structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A dielectric material is introduced as an intermediary between the passive and active antenna modules. This dielectric serves as a thermal barrier that reduces heat transfer between modules while maintaining electromagnetic signal propagation, effectively managing heat dissipation without compromising multi-band functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple frequency bands are managed in a single antenna structure, then capacity is improved, but signal propagation efficiency deteriorates due to interference between bands

Engineering Contradiction:

ImprovecapacityVSAvoidsignal propagation efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The antenna system segments frequency band handling into distinct passive and active modules. Each module is optimized for specific frequency ranges, preventing signal interference that would occur in a monolithic structure. This segmentation maintains high signal propagation efficiency while accommodating multiple frequency bands for increased capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the antenna system are assigned different functional qualities - the passive module is optimized for lower frequency bands with specific element configurations, while the active module is optimized for higher frequency bands with beamforming capabilities. This local optimization ensures efficient signal propagation in each band without cross-interference.

Inventive Principle:

Principle #3Local quality

3Power

If active beamforming is implemented to narrow beamwidth and increase gain, then signal strength is improved, but heat generation increases causing overheating

Engineering Contradiction:

Improvesignal strengthVSAvoidheat generation

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The active beamforming functionality is extracted into a separate active antenna module rather than being integrated with passive elements. This extraction isolates the heat-generating active components from passive elements, allowing dedicated thermal management for the active module while maintaining high signal strength through beamforming operations.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A dielectric material serves as a thermal intermediary between active and passive modules, blocking heat transfer from the heat-generating active beamforming components while permitting electromagnetic signal transmission. This maintains signal strength benefits of active beamforming without transferring heat to other parts of the antenna system.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances signal propagation efficiency across multiple frequency bands and improves heat management, ensuring optimal performance and reliability of the antenna system.

Implementation Method 1

a grid reflector and frequency selective surfaces (FSS) that segregate and manage different frequency bands, allowing high-band radiating elements to propagate through while reflecting lower-band signals

Methodology Applied

Scientific EffectFrequency selective reflection: Reflection

Implementation Method 2

incorporating a dielectric cover for improved heat dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250316891A1Base station antennas having at least one grid reflector and related devices

Publication Date: 2025.10.09 OUTDOOR WIRELESS NETWORKS LLC

AI summary

Base station antennas include at least one passive internal grid reflector with an array of low band radiating elements projecting forward of a front one of the at least one grid reflector. A mMIMO antenna array resides behind a back one of the at least one grid reflector and is configured to transmit signal through the grid reflector and out a front radome of the base station antenna.