Active Antenna Tuning for Multi-Band Wireless Devices
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Solution Overview
Problem
Current wireless portable devices require multiple antennas for different frequency bands, leading to mechanical design complexity, increased costs, and manufacturing challenges due to the need for separate antennas and feedlines, which becomes impractical as devices must accommodate an increasing number of frequency bands for connectivity.
Innovation Solution
The implementation of active antenna tuning using tunable capacitors and a controller to allow a single antenna to be used for simultaneous transmission and reception across multiple bands, simplifying mechanical design and reducing the number of required antennas and feedlines by using active impedance matching and RF isolation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate antennas are used for different frequency bands, then each antenna can be optimized for its specific band, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent combines multiple frequency band antennas into a single integrated antenna structure. The antenna element is designed with multiple resonant frequencies, allowing it to serve multiple bands (e.g., LTE, Wi-Fi, Bluetooth) simultaneously, thereby reducing the number of separate antennas and associated feedlines while maintaining optimized performance across all bands.
Solution Approach 2:
The single antenna is designed to perform multiple functions across different frequency bands. By incorporating tuning elements and variable impedance structures, the antenna can be dynamically adjusted to resonate at multiple frequencies, making it a universal solution that replaces multiple dedicated antennas.
2Adaptability or versatility
If multiple separate antennas and feedlines are used, then each band can be independently designed, but the manufacturing cost and bill of materials increase
Solution Approach 1:
The patent merges multiple feedlines into a single shared feedline that distributes signals to different frequency bands through the single antenna structure. This eliminates the need for multiple separate feedlines, reducing the bill of materials and manufacturing complexity while maintaining the ability to independently configure each band's performance through tuning elements.
3Reliability
If multiple antennas are mounted in the device casing, then each antenna can be positioned for optimal performance, but the mechanical design and packaging complexity increase
Solution Approach 1:
The patent consolidates multiple antenna elements into a single integrated antenna structure that can be mounted in one location within the device casing. This single structure incorporates multiple resonant elements and tuning mechanisms, simplifying the mechanical design and packaging while maintaining optimized performance for each frequency band through internal configuration rather than external positioning.
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
This solution simplifies the mechanical design and reduces costs by enabling a single antenna to serve multiple bands, maintaining antenna efficiency and reducing the complexity of manufacturing and device packaging, while allowing for flexible placement of antennas within devices.
Implementation Method 1
active antenna tuning using tunable capacitors
Implementation Method 2
each antenna designed for resonance or desired performance at a particular frequency band
Data Source
AI summary
Wireless devices, and particularly mobile devices such as cellphones, PDAs, computers, navigation devices, etc., as well as other devices which transmit or receive data or other signals at multiple frequency bands utilize at least one antenna to transmit and receive and a plurality of different bands (e.g., GSM cellular communication band; Bluetooth short range communication band; ultrawideband (UWB) communications, etc.). These wireless devices can simultaneously transmit or receive at a plurality of different bands, or simultaneously transmit and receive at different bands. The wireless devices have the ability to use a single physical structure (e.g., an antenna) for transmission and reception of many different bands. The antenna can be either actively tuned or passively tuned using one or more elements.