Tunable Antenna Systems for Multi-Band Wireless Devices
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Solution Overview
Problem
Conventional antenna structures in small electronic devices often have limited operating bandwidths, making it difficult to cover all desired communications bands, which is a challenge in implementing compact wireless communications circuitry.
Innovation Solution
An adjustable antenna system with tunable electrical components, such as switches and continuously adjustable resistances, capacitances, and inductances, controlled by storage and processing circuitry to fine-tune and coarse-tune antenna parameters, including transmission line structures, matching networks, and antenna resonating elements, to ensure coverage of multiple communications bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna structures are used in small electronic devices, then the device form factor remains compact, but the operating bandwidth becomes limited and cannot cover all desired communications bands
Solution Approach 1:
The patent implements a tunable antenna system where antenna parameters such as resonant frequency and impedance can be dynamically adjusted using variable capacitors, variable inductors, and switching networks. This allows the antenna to adapt its electrical characteristics in real-time to cover multiple communication bands, resolving the contradiction between compact size and wide bandwidth coverage.
Solution Approach 2:
The patent changes physical parameters of the antenna system including capacitance values, inductance values, and electrical length of resonating elements. By adjusting these parameters through tunable components and switching networks, the antenna can operate across multiple frequency bands despite maintaining a compact physical form factor.
2Length of moving object
If the antenna volume is reduced to fit small devices, then the device size decreases, but the antenna bandwidth becomes too narrow to cover all communications bands of interest
Solution Approach 1:
The patent uses dynamically tunable components including variable capacitors and variable inductors that allow the antenna's electrical characteristics to be adjusted in real-time. This dynamic adjustment enables a physically short antenna to achieve the electrical length and bandwidth characteristics of a longer antenna across multiple frequency bands.
Solution Approach 2:
The patent modifies key electrical parameters including resonant frequency, impedance, and quality factor through tunable components. By changing these parameters, the antenna can cover wide bandwidths and multiple communication bands despite having a reduced physical length suitable for compact devices.
3Adaptability or versatility
If fixed antenna structures are used, then the device complexity is reduced, but the antenna cannot be tuned to cover multiple communications bands
Solution Approach 1:
The patent introduces dynamic tuning capabilities through controlled components such as variable capacitors, variable inductors, and switching networks that can be adjusted via control signals. This allows a single antenna structure to perform multiple functions and cover multiple bands, managing complexity through integrated control rather than using multiple fixed antennas.
Solution Approach 2:
The patent designs a universal antenna system that can operate across multiple communication bands by incorporating tunable elements and switching networks. This single multi-functional antenna replaces what would traditionally require multiple fixed-frequency antennas, achieving multi-band coverage while managing system complexity through integration.
Data Source
AI summary
An electronic device has wireless communications circuitry including an adjustable antenna system coupled to a radio-frequency transceiver. The adjustable antenna system may include one or more adjustable electrical components that are controlled by storage and processing circuitry in the electronic device. The adjustable electrical components may include switches and components that can be adjusted between numerous different states. The adjustable electrical components may be coupled between antenna system components such as transmission line elements, matching network elements, antenna elements and antenna feeds. By adjusting the adjustable electrical components, the storage and processing circuitry can tune the adjustable antenna system to ensure that the adjustable antenna system covers communications bands of interest.