Switchable Antenna Grounding for Multiband Mobile Devices
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Solution Overview
Problem
Traditional mobile device antennas with fixed metal elements are limited in design flexibility and cannot effectively cover multiple frequency bands, making it difficult to achieve both multiband and wideband operations without increasing the antenna size.
Innovation Solution
A mobile device antenna structure comprising a radiation element, short-circuited elements, and a switchable grounding system, along with a variable capacitor, allows for selective operation across multiple frequency bands by adjusting capacitance and switching states, forming different resonant paths to accommodate various frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a metal element with a fixed size is used as the main body of an antenna, then the antenna structure is simple and easy to manufacture, but it cannot cover multiple frequency bands and limits design flexibility
Solution Approach 1:
The patent applies dynamics by making the antenna structure adjustable through switching elements that can change the electrical connection states between different grounding points and antenna elements. This allows the same physical structure to dynamically reconfigure its electrical characteristics to support multiple frequency bands, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent changes electrical parameters (impedance, resonant frequency) by switching between different grounding configurations and adjusting capacitor values. This allows a single antenna structure to operate across multiple frequency bands by modifying its electrical parameters rather than its physical dimensions, achieving versatility without increasing structural complexity.
2Adaptability or versatility
If the antenna structure is designed to cover multiple frequency bands, then frequency coverage is improved, but the antenna size and structural complexity increase
Solution Approach 1:
The patent achieves multiband operation with a single antenna structure by implementing multiple grounding points and switching elements that allow one physical antenna to serve multiple frequency bands. The same radiation element and grounding structure can be reconfigured to support different resonant frequencies, eliminating the need for separate antennas for each band and maintaining compact size.
3Adaptability or versatility
If switching elements and variable capacitors are added to achieve multiband operation, then frequency band coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces mechanical antenna adjustments with electrical switching mechanisms. Instead of physically moving or reconfiguring antenna elements, the system uses electronic switching elements and variable capacitors to change the electrical characteristics, simplifying the manufacturing process while maintaining multiband 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 antenna structure achieves efficient multiband and wideband operations without increasing the total size, with antenna efficiency exceeding 44% in low-frequency bands and 70.4% in high-frequency bands, supporting frequencies from 704 MHz to 2700 MHz, suitable for various mobile communication applications.
Implementation Method 1
a variable capacitor, wherein a signal source is coupled through the variable capacitor to the feeding point
Implementation Method 2
a first resonant path is formed extending from the fixed grounding point to the left to the first end, and the first resonant path is excited to generate a first low-frequency band
Data Source
AI summary
A mobile device includes a ground element, a radiation element, a first short-circuited element, a second short-circuited element, and a switch element. The radiation element has a feeding point, a fixed grounding point, and a switchable grounding point. The fixed grounding point is coupled through the first short-circuited element to the ground element. The switchable grounding point is coupled through the second short-circuited element and the switch element to the ground element. An antenna structure is formed by the radiation element, the first short-circuited element, the second short-circuited element, and the switch element.