Low-Loss Glass Substrate for Temperature-Stable Liquid Crystal Antennas
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Solution Overview
Problem
Conventional resin and glass substrates exhibit significant changes in dielectric characteristics with temperature fluctuations, making them unsuitable for high-frequency applications, especially in outdoor environments where temperature ranges are wide, leading to unstable antenna performance and increased dielectric loss in communication devices.
Innovation Solution
Development of substrates with controlled dielectric loss tangent and relative permittivity across a wide temperature range (-40 to 150°C), ensuring stability and reduced dielectric loss, characterized by specific ratios and values at 10 GHz and 35 GHz frequencies, suitable for high-frequency circuits and liquid-crystal antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resin or glass substrates are used in high-frequency applications, then the devices can be manufactured with existing materials, but the dielectric characteristics change considerably with frequency and temperature, leading to unstable antenna performance
Solution Approach 1:
The patent applies parameter changes by carefully controlling the glass composition parameters (SiO2: 60-75 mol%, B2O3: 10-30 mol%, Al2O3: 5-20 mol%, and other components within specified ranges) to achieve stable dielectric characteristics across wide temperature and frequency ranges. The dielectric loss tangent is maintained at 0.1 or less at both 10 GHz and 35 GHz, and the ratio of dielectric loss tangent at different temperatures is controlled within 0.90-1.10, ensuring stable antenna performance.
Solution Approach 2:
The patent uses a composite glass substrate material combining multiple oxides (SiO2, B2O3, Al2O3, and others) in specific proportions to achieve both low dielectric loss and temperature stability. This composite material approach allows the substrate to maintain consistent dielectric characteristics across -40 to 150°C temperature range and up to 35 GHz frequency, resolving the contradiction between material availability and performance stability.
2Adaptability or versatility
If conventional substrates are used in outdoor environments with wide temperature ranges, then the devices can be deployed in various locations, but the dielectric loss increases and antenna performance becomes unstable
Solution Approach 1:
The patent controls the glass composition parameters to achieve low dielectric loss (tan δ ≤ 0.1 at 10 GHz and 35 GHz) and temperature stability (ratio of dielectric loss tangent between -40°C and 150°C within 0.90-1.10). This allows the substrate to maintain low energy loss and stable performance across wide temperature ranges, enabling deployment in various outdoor environments from cold to hot regions.
3Reliability
If substrates with stable dielectric characteristics are developed, then the antenna performance can be stabilized across temperature ranges, but the material composition and manufacturing requirements become more stringent
Solution Approach 1:
The patent specifies precise composition ranges for glass components (SiO2: 60-75 mol%, B2O3: 10-30 mol%, Al2O3: 5-20 mol%, and others) to achieve stable dielectric characteristics. By defining these parameter ranges, the patent balances the need for composition control precision with achievable manufacturing capabilities, ensuring that substrates meeting these specifications can be produced with consistent performance.
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 substrates provide stable dielectric characteristics and reduced dielectric loss over a wide temperature range, enhancing the performance and practicality of high-frequency devices and liquid-crystal antennas by minimizing temperature-induced changes in signal strength.
Implementation Method 1
the substrates can reduce the dielectric loss of high-frequency signals and can be stably used in a wide temperature range
Implementation Method 2
a relative permittivity (a) as measured at 20° C. and 10 GHz of 4 or more and 10 or less
Data Source
AI summary
The present invention relates to a substrate having a dielectric loss tangent (A) as measured at 20° C. and 10 GHz of 0.1 or less, a dielectric loss tangent (B) as measured at 20° C. and 35 GHz of 0.1 or less, and a ratio [a dielectric loss tangent (C) as measured at an arbitrary temperature in a range of −40 to 150° C. and at 10 GHz]/[the dielectric loss tangent (A)] of 0.90-1.10, or a substrate having a relative permittivity (a) as measured at 20° C. and 10 GHz of 4 or more and 10 or less, a relative permittivity (b) as measured at 20° C. and 35 GHz of 4 or more and 10 or less, and a ratio [a relative permittivity (c) as measured at an arbitrary temperature in a range of −40 to 150° C. and at 10 GHz]/[the relative permittivity (a)] of 0.993-1.007.