Multiband Antenna Architecture with Dynamic Impedance Matching
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Solution Overview
Problem
Traditional front-end antenna architectures face challenges with size, insertion loss, return loss, specific absorption rate (SAR), cost, and efficiency, particularly when trying to accommodate multiple frequency bands in a compact form without increasing the device's bezel size, and often result in high insertion loss due to inefficient filtering.
Innovation Solution
The proposed antenna architecture uses a single antenna for high and middle frequency bands and a separate antenna for low frequency bands, employing a matching circuit with enable/disable switches to maintain impedance matching between sub-bands, eliminating the need for quadplexers and reducing insertion loss, thus achieving a smaller footprint and lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional front-end antenna architectures use multiple antennas and quadplexers to accommodate multiple frequency bands, then frequency band coverage is improved, but device size and insertion loss increase
Solution Approach 1:
The patent implements a universal antenna system where a single antenna structure serves multiple frequency bands (low band, middle band, high band) through configurable switching networks. The front-end module uses enable/disable switches and matching circuits to adapt the same antenna for different frequency ranges, eliminating the need for separate dedicated antennas for each band, thus reducing device size while maintaining multi-band coverage capability
Solution Approach 2:
The patent segments the frequency spectrum into distinct bands (low, middle, high) and uses switching networks to selectively connect the single antenna to appropriate signal paths for each band. This segmentation allows the system to handle multiple frequency bands through time- or frequency-division multiplexing rather than requiring simultaneous physical separation of antenna elements
2Adaptability or versatility
If traditional architectures use quadplexers for multi-band filtering, then frequency selectivity is improved, but insertion loss increases
Solution Approach 1:
The patent employs dynamic switching networks with enable/disable switches that can be configured in real-time based on the active frequency band. Instead of using fixed quadplexer filters that always introduce insertion loss, the system dynamically reconfigures the signal path to connect the antenna to the appropriate transceiver chain, minimizing the number of passive filtering components in the signal path and thereby reducing insertion loss while maintaining frequency selectivity
3Reliability
If a single antenna is used for high and middle bands with separate antenna for low band, then impedance matching is improved, but device complexity increases
Solution Approach 1:
The patent introduces matching circuits as intermediary components between the single antenna and the transceiver for high and middle bands. These matching circuits act as mediators that transform the antenna's impedance to match the transceiver's input impedance, ensuring reliable signal transfer. The same technique is applied to the low band antenna connection, providing consistent impedance matching across all frequency bands while using a unified architectural approach rather than fundamentally different antenna designs
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 allows for efficient bi-directional communication across multiple sub-bands with low insertion loss, enabling carrier aggregation without the need for quadplexers, resulting in a more compact and cost-effective design that preserves display space in wireless communication devices.
Implementation Method 1
employing a matching circuit with enable/disable switches to maintain impedance matching between sub-bands
Data Source
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AI summary
The described technology provides front-end antenna architecture for wireless communication that manages multiple frequency sub-bands in a manner that results is a low insertion loss rate. Further, the components of the architecture are smaller than typical wireless communication antenna architectures, and therefore the described architecture can be accommodated in a smaller area than typical architectures without a decrease in efficiency. A matching circuit is communicatively connected to each frequency sub-band's respective signal path. When two or more sub-bands are requested for high-speed wireless communication, the matching circuits match the impedance of each sub-band with one-another. Matching the impedance allows two or more sub-bands to be used to wirelessly communicate while maintaining high efficiency. The matching circuits are disabled when only one sub-band is needed for wireless communication.