Antenna Protective Layer Thickness Control via Inkjet Deposition

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Solution Overview

Problem

Current methods for applying antenna protective layers on wireless communication devices result in non-uniform thickness, leading to performance variations and increased signal attenuation, which affects the impedance matching between antennas and transceiver circuits, causing performance issues and costly scrap.

Innovation Solution

The use of ink jet deposition and screen deposition techniques to control the thickness of the antenna protective layer to within ±10% of a predetermined thickness, reducing signal attenuation and ensuring uniformity across devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If film lamination or squeegee process is used to apply antenna protective layer, then the antenna is protected, but the minimum protective film thickness is limited to about 15 μm with thickness variation of +/−30% or more

Engineering Contradiction:

Improveantenna protectionVSAvoidprotective film thickness uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical deposition methods (film lamination, squeegee process) with inkjet printing technology to deposit the antenna protective layer. This substitution enables precise thickness control and uniformity while maintaining the protective function, achieving thickness variation within +/−10% or better compared to the +/−30% or more variation from mechanical methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If thicker protective layer is applied to ensure coverage, then antenna protection is improved, but signal loss increases due to lossy material

Engineering Contradiction:

Improveantenna protectionVSAvoidsignal loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent changes the thickness parameter of the protective layer by using inkjet printing to achieve thinner, more uniform layers (within +/−10% variation) compared to traditional methods. This parameter optimization reduces the amount of lossy material between the antenna and environment, thereby reducing signal loss while maintaining adequate protection.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If variation in film thickness is accepted, then manufacturing complexity is reduced, but non-uniform performance of antennas between devices results

Engineering Contradiction:

Improveprotective layer applicationVSAvoidantenna performance uniformity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces mechanical deposition systems with inkjet printing technology, which provides digital precision and programmable deposition control. This enables consistent thickness control (within +/−10% or better) across all devices in the array, ensuring uniform antenna performance while maintaining ease of manufacture through automated printing processes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of manufacture

If antenna protective layer is applied with +/−30% thickness variation, then manufacturing is simpler, but impedance matching between antennas and transceiver circuits deteriorates

Engineering Contradiction:

Improveprotective layer depositionVSAvoidimpedance matching

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent optimizes the thickness parameter of the protective layer by using inkjet printing to achieve uniform thickness (within +/−10% or better). This precise parameter control ensures consistent impedance matching between antennas and transceiver circuits across all devices, eliminating the +/−30% or more variation that causes performance issues in traditional methods.

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

This approach achieves consistent performance across wireless communication devices by maintaining precise thickness control of the antenna protective layer, reducing signal loss and minimizing the number of devices that fail performance specifications, thereby reducing manufacturing costs and improving overall system efficiency.

Implementation Method 1

The antenna protection layer can be deposited on the antenna array using ink jet deposition, screen deposition, or other deposition techniques

Methodology Applied

Scientific EffectInk jet deposition:

Implementation Method 2

The antenna protection layer can be deposited on the antenna array using ink jet deposition, screen deposition, or other deposition techniques

Methodology Applied

Scientific EffectScreen deposition:

Implementation Method 3

The antenna side of the antenna substrate strip is coated with the antenna protection layer followed by photo or thermal curing

Methodology Applied

Scientific EffectPhoto curing: Photopolymerisation

Data Source

PatentUS20200212536A1Wireless communication device with antenna on package

Publication Date: 2020.07.02 TEXAS INSTRUMENTS INC

AI summary

In a described example, a wireless communication device includes an antenna substrate having an antenna on an antenna side surface; a semiconductor die on an device side surface of the antenna substrate, opposite the antenna side surface; and an antenna protection layer covering the antenna and a portion of the antenna side surface of the antenna substrate having a uniform predetermined thickness across the antenna side surface of the antenna substrate within +/−10%.