Wireless Device Radiating Structure With Tunable Multiband Matching
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Solution Overview
Problem
Existing wireless devices with antennaless radiating systems require complex and large matching networks with many passive reactive components to achieve impedance matching across multiple frequency bands, leading to inefficiencies and increased size, which can be exacerbated by out-of-tune boosting elements.
Innovation Solution
Incorporation of a tunable reactive element in the radiofrequency system, reducing the number of components and allowing for self-tuning to improve impedance matching and reduce system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex matching network with many passive reactive components is used to achieve impedance matching across multiple frequency bands, then impedance matching performance is improved, but device size and component count increase
Solution Approach 1:
The patent employs a tunable reactive element that can dynamically adjust its electrical characteristics to match different frequency bands, replacing the need for multiple fixed passive components. This dynamic adjustment capability allows the system to achieve impedance matching across multiple frequency bands while using fewer physical components.
Solution Approach 2:
The tunable reactive element changes its electrical parameters (capacitance or inductance) based on the operating frequency band, enabling the same component to provide optimal impedance matching across multiple frequency regions without requiring separate fixed-value passive components for each band.
2Reliability
If a complex matching network with many passive reactive components is used to achieve impedance matching across multiple frequency bands, then impedance matching performance is improved, but device size increases
Solution Approach 1:
The tunable reactive element provides dynamic parameter adjustment capability within a compact footprint, eliminating the need for large arrays of fixed passive components that would be required to achieve the same multi-band impedance matching performance, thereby reducing the overall device area.
Solution Approach 2:
The single tunable reactive element serves multiple functions across different frequency bands, replacing what would traditionally require multiple separate passive components, thus achieving multi-band impedance matching with minimal component count and reduced device area.
3Device complexity
If out-of-tune boosting elements are used in the radiating system, then device complexity is reduced, but antenna efficiency deteriorates
Solution Approach 1:
The tunable reactive element dynamically adjusts its parameters to compensate for out-of-tune boosting elements, maintaining optimal impedance matching and antenna efficiency even when the boosting elements are not precisely tuned, thereby preserving performance while simplifying the overall device complexity.
Solution Approach 2:
The system uses feedback mechanisms to detect impedance mismatches caused by out-of-tune boosting elements and automatically adjusts the tunable reactive element to compensate, maintaining high antenna efficiency without requiring complex manual tuning or multiple passive components.
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
Enhances antenna efficiency, reduces component count, and minimizes clearance area, resulting in smaller wireless devices with improved performance across multiple frequency bands.
Implementation Method 1
a radiofrequency system suitable to modify the impedance of the radiating structure, thus providing impedance matching to the radiating system in the at least first and second frequency regions of operation of the radiating system
Implementation Method 2
a radiating system capable of transmitting and receiving electromagnetic wave signals in at least two frequency regions (frequency bands)
Data Source
AI summary
A wireless device includes a ground plane layer having a maximum size smaller than half of a longest free-space operating wavelength of the wireless device, a boosting element having a largest dimension smaller than ⅙ times the longest free-space operating wavelength, and a radiofrequency system with a tunable reactive circuit. The tunable reactive circuit includes a switch connected between the boosting element and a transceiver and a bank of fixed matching networks. At least a portion of an orthogonal projection of the boosting element onto a plane containing the ground plane layer overlaps the ground plane layer.