Multiband Antenna Capacitive Coupling Miniaturization
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Solution Overview
Problem
Multiband antennas for wireless communication devices require multiple resonance paths to cover various frequency bands, resulting in a larger and more complex structure that hinders device miniaturization.
Innovation Solution
A compact multiband antenna design utilizing a main antenna, coupling unit, and matching unit, where the main antenna operates as a low-frequency resonance path and the coupling unit enhances the frequency range through capacitive effects, allowing for dual-band operation without multiple resonance paths, and is mounted on a printed circuit board for impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple resonance paths are used to cover multiple frequency bands, then the frequency coverage is improved, but the antenna size and structural complexity increase
Solution Approach 1:
The patent implements a single resonance path that serves multiple frequency bands through capacitive coupling. The main antenna element works in conjunction with a coupling unit that includes capacitors, allowing the same physical structure to resonate at multiple frequencies (e.g., 850 MHz, 900 MHz, 1800 MHz, 1900 MHz) without requiring separate resonance paths for each band, thus achieving multi-functionality.
Solution Approach 2:
The patent changes the electrical parameters of the antenna system by introducing capacitive coupling elements. By adjusting the capacitance values in the coupling unit, the resonant frequencies of the single antenna structure can be tuned to operate across multiple frequency bands, enabling parameter-based frequency multiplication without increasing physical complexity.
2Adaptability or versatility
If multiple resonance paths are used to cover multiple frequency bands, then the frequency coverage is improved, but the antenna size increases
Solution Approach 1:
The patent implements a single resonance path that serves multiple frequency bands through capacitive coupling. The main antenna element works in conjunction with a coupling unit that includes capacitors, allowing the same physical structure to resonate at multiple frequencies (e.g., 850 MHz, 900 MHz, 1800 MHz, 1900 MHz) without requiring separate resonance paths for each band, thus achieving multi-functionality.
3Area of moving object
If a compact antenna structure is used, then device miniaturization is improved, but the frequency coverage capability deteriorates
Solution Approach 1:
The patent changes the electrical parameters of the antenna system by introducing capacitive coupling elements. By adjusting the capacitance values in the coupling unit, the resonant frequencies of the single antenna structure can be tuned to operate across multiple frequency bands, enabling parameter-based frequency multiplication without increasing physical complexity.
Solution Approach 2:
The coupling unit acts as an intermediary between the main antenna element and the feed line. This intermediate structure includes capacitors that enable the compact antenna to achieve multiple resonant frequencies by controlling the electrical length and impedance transformation, thus bridging the gap between compact size and multi-band capability.
4Ease of manufacture
If a simplified antenna structure is used, then manufacturing ease is improved, but the impedance matching capability deteriorates
Solution Approach 1:
The coupling unit acts as an intermediary between the main antenna element and the feed line. This intermediate structure includes capacitors that enable the compact antenna to achieve multiple resonant frequencies by controlling the electrical length and impedance transformation, thus bridging the gap between compact size and multi-band capability.
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 design achieves efficient operation across multiple frequency bands, including GSM850/900, GSM1800/1900, and UMTS, with a simplified structure that supports device miniaturization and maintains a low VSWR, ensuring compatibility with various communication systems.
Implementation Method 1
the coupling unit enhances the frequency range through capacitive effects
Implementation Method 2
the main antenna operates as a low-frequency resonance path
Data Source
AI summary
A multiband antenna, includes a main antenna, a coupling unit, and a matching unit. The main antenna includes a feed portion, a bent portion, a radiation portion, and an extending portion in a same plane. One end of the feed portion is connected to the coupling unit. The bent portion is perpendicularly connected to the other end of the feed portion. The radiation portion is parallel with the feed portion and perpendicularly connected to one end of the bent portion away from the feed portion. The extending portion is connected to one end of the radiation portion away from the bent portion, the coupling unit is parallel with the main antenna and connected to the matching unit, the matching unit feeds signals to and grounds the multiband antenna.