Tunable Antenna Variable Capacitor LTE Bandwidth
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Solution Overview
Problem
Miniaturization of LTE antennas results in inadequate bandwidth for low frequencies, preventing full coverage of operation frequencies.
Innovation Solution
A tunable antenna structure utilizing a variable capacitor element, which adjusts capacitance values between 3.9 pF and 39 pF to control the operation frequency, allowing the antenna to receive signals between 824 and 960 MHz and 704 and 787 MHz, thereby enhancing antenna characteristics and reducing dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the substrate dimension is reduced to miniaturize the LTE antenna, then the antenna dimension is decreased, but the bandwidth for low frequency becomes inadequate
Solution Approach 1:
The patent applies a variable capacitor element that can dynamically adjust its capacitance value between different states (e.g., 3.9 pF and 39 pF) to change the antenna's resonant frequency. This dynamic adjustment allows the antenna to adapt to different frequency bands (704-787 MHz and 824-960 MHz) while maintaining a compact substrate size, thus resolving the contradiction between miniaturization and bandwidth coverage.
Solution Approach 2:
The patent changes the electrical parameters of the antenna by introducing a variable capacitor element that can switch between different capacitance values. This parameter change enables the antenna to operate at different resonant frequencies without changing the physical dimensions of the substrate, thereby achieving both miniaturization and adequate bandwidth coverage.
2Adaptability or versatility
If a variable capacitor element is added to adjust operation frequency, then the bandwidth coverage is improved, but the device complexity increases
Solution Approach 1:
The patent merges the variable capacitor element directly into the antenna structure by positioning it between the first and second metal strips on the substrate. This integration allows the capacitor to be part of the resonant circuit without requiring separate components or complex assembly, thus improving frequency coverage while minimizing the increase in device complexity.
Solution Approach 2:
The variable capacitor element serves multiple functions: it adjusts the resonant frequency of the antenna, enables operation in different frequency bands (704-787 MHz and 824-960 MHz), and maintains the compact size of the antenna. This multi-functionality improves frequency coverage without proportionally increasing device complexity.
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 tunable antenna structure effectively receives low-frequency signals and can be miniaturized, improving antenna performance and bandwidth, meeting specifications for both low and high frequencies.
Implementation Method 1
By changing the capacitance of the variable capacitor element, the operation frequency of the antenna is adjusted
Data Source
AI summary
A tunable antenna structure having a variable capacitor includes a substrate, a first metal strip, a second metal strip and a third metal strip formed on the substrate, a variable capacitor element located between the first metal strip and the second metal strip, an inductor element located between the second metal strip and the third metal strip, a first capacitor element located between the first metal strip and the third metal strip, and a second capacitor element located on the third metal strip.