Antenna Apparatus Frequency-Dependent Impedance Matching
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Solution Overview
Problem
Mobile communication devices, particularly smartphones, face challenges in optimizing signal transmission and reception across various frequency bands, leading to increased transmission loss due to the need to process both low-frequency and high-frequency signals effectively.
Innovation Solution
An antenna apparatus with a radiating metal and frequency-dependent impedances that change their impedance values and resonance modes in response to signal frequencies, allowing for parallel and series connections to resonate with both low-frequency and high-frequency signals, minimizing transmission loss by optimizing impedance matching across broad frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a built-in antenna processes both low-frequency and high-frequency signals, then multi-functionality is improved, but transmission loss increases
Solution Approach 1:
The antenna is divided into multiple radiating elements with different lengths, where each element is optimized for specific frequency bands. The first radiating element handles low-frequency signals while the second radiating element handles high-frequency signals, allowing simultaneous multi-band operation with reduced transmission loss for each band.
2Device complexity
If a single radiating element is used, then device complexity is reduced, but frequency band coverage is limited
Solution Approach 1:
Multiple radiating elements with different electrical characteristics are merged into a single integrated antenna structure. The first and second radiating elements are positioned and coupled to the feed network such that they collectively provide broad frequency band coverage while maintaining a compact form factor suitable for mobile devices.
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 antenna apparatus effectively resonates with both low-frequency and high-frequency signals, expanding the frequency range with minimal transmission loss, enabling broader band operation and improved signal processing in mobile communication devices.
Implementation Method 1
a first impedance which is connected between the radiating metal and a ground, has an impedance value which is changed depending on a frequency, and resonates in response to a predetermined frequency
Implementation Method 2
a second impedance which is connected between the radiating metal and the ground, has an impedance value which is changed depending on a frequency, and resonates in response to the predetermined frequency
Implementation Method 3
A first inductor and a first capacitor of the first impedance are connected in parallel to each other
Implementation Method 4
A second inductor and a second capacitor of the second impedance are connected in series to each other
Data Source
AI summary
An antenna apparatus may be provided that includes: a radiating metal; a ground which is connected to the radiating metal; a first impedance which forms a first path by being connected between the radiating metal and the ground, has an impedance value which is changed depending on a frequency, and opens the first path in response to a predetermined frequency, and a second impedance which forms a second path parallel with the first path by being connected between the radiating metal and the ground, has an impedance value which is changed depending on a frequency, and short-circuits the second path in response to the predetermined frequency.