Thermoplastic Composition for LDS Antennas with Low Loss Tangent
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Solution Overview
Problem
Current materials for laser direct structuring (LDS) in manufacturing three-dimensional antennas for mobile devices fail to achieve a high dielectric constant and low loss tangent, especially at high frequencies, which is essential for reducing antenna size and minimizing energy loss.
Innovation Solution
A thermoplastic composition comprising 20-90% thermoplastic resin, 0.1-80% laser direct structuring additive, and 10-80% ceramic filler particles, with at least 80% of the ceramic filler being TiO2, which results in a low loss tangent of no more than 0.014 at 40 GHz, outperforming traditional materials like BaTiO3 at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional ceramic fillers like BaTiO3 are used in LDS composition, then the dielectric constant is increased, but the loss tangent becomes too high at high frequencies
Solution Approach 1:
The patent changes the chemical composition parameter of the ceramic filler from traditional BaTiO3 to TiO2-based ceramics. This parameter change fundamentally alters the material's electromagnetic properties, achieving a low loss tangent (≤0.014 at 40 GHz) while maintaining adequate dielectric constant for antenna applications.
Solution Approach 2:
The patent creates a composite material system combining TiO2 ceramic particles (80-90 wt%) with a thermoplastic resin matrix and LDS additive. This composite structure leverages TiO2's excellent high-frequency dielectric properties while the resin matrix provides mechanical strength and processability, achieving both low loss tangent and structural integrity.
2Loss of energy
If TiO2 is used as ceramic filler instead of BaTiO3, then the loss tangent is reduced at high frequencies, but the dielectric constant may be affected
Solution Approach 1:
The patent optimizes the concentration of TiO2 ceramic filler at 80-90 wt% to achieve the desired balance. This high concentration ensures sufficient dielectric constant while maximizing the loss reduction benefits of TiO2 at high frequencies, particularly at 40 GHz where loss tangent ≤0.014 is achieved.
3Volume of moving object
If high concentration of ceramic filler is used to increase dielectric constant, then antenna size can be reduced, but the mechanical strength and processability of the composition deteriorates
Solution Approach 1:
The patent uses a thermoplastic resin matrix to bind the TiO2 ceramic particles, creating a composite that maintains mechanical strength and moldability despite high filler concentration (80-90 wt%). The thermoplastic matrix provides flexibility for molding while the TiO2 particles provide the desired dielectric properties for compact antenna design.
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 composition achieves improved radio frequency performance with a low loss tangent at high frequencies, enhancing antenna design by reducing size and energy loss, while maintaining mechanical strength and flame retardancy.
Implementation Method 1
the composition has a loss tangent measured at 40 GHz of at most 0.014
Implementation Method 2
irradiating laser to the surface of a resin molded article that contains an LDS additive, to thereby activate only the portion irradiated by the laser
Data Source
AI summary
A thermoplastic composition including a) 20 to 90 wt. % of a thermoplastic resin, b) 0.1 to 80 wt. % of a laser direct structuring additive and c) 10 to 80 wt. % of ceramic filler particles which do not have a laser direct structuring additive function, wherein at least 80 wt. % of c) is TiO2, wherein the composition has a loss tangent measured at 40 GHz of at most 0.014, wherein the total amount of a), b) and c) is 95 to 100 wt. % with respect to the total composition, wherein the composition further includes f) one or more additives, wherein the total amount of the additives is 0.1 to 5 wt. %, 0.3 to 5 wt. % or 0.3 to 3 wt. % relative to the total weight of the composition.