Dynamic Impedance Matching for Multi-Band Antenna Signal Isolation
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Solution Overview
Problem
The challenge in designing electronic devices such as smartphones is the limited mounting space for multiple antennas required to support various frequency bands, leading to inefficiencies in signal reception due to shared antennas and increased insertion loss.
Innovation Solution
The implementation of a matching circuit that selectively connects with filters and transceivers based on the frequency band of the received signal, improving signal strength and reducing insertion loss by optimizing impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single antenna is used to cover multiple frequency bands, then the mounting space is reduced, but the received signal strength decreases
Solution Approach 1:
The patent implements dynamic impedance matching by selectively connecting different matching circuits (first matching circuit for low band, second matching circuit for mid band, third matching circuit for high band) based on the operating frequency band. This dynamic adaptation allows the antenna to maintain optimal impedance matching across multiple frequency bands, thereby improving received signal strength while using a single antenna structure.
2Device complexity
If a single antenna covers both low and mid frequency bands, then the device complexity is reduced, but the signal isolation deteriorates
Solution Approach 1:
The patent uses dynamic switching of matching circuits based on frequency band to achieve proper impedance matching and signal isolation. The switch selectively connects the appropriate matching circuit (first for low band, second for mid band) depending on the operating frequency, ensuring that signals in different bands are properly isolated while maintaining low device complexity with a single antenna.
3Device complexity
If a radiator covers multiple frequency bands, then the number of antennas is reduced, but the insertion loss increases
Solution Approach 1:
The patent implements dynamic impedance matching by selectively connecting different matching circuits based on the operating frequency band. The first matching circuit is connected for low band operations, the second matching circuit for mid band, and the third matching circuit for high band. This dynamic adaptation minimizes reflection loss and insertion loss across all frequency bands by ensuring optimal impedance matching at each band, thereby reducing overall energy loss while using a single multi-band antenna.
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 approach enhances the received signal strength and reduces insertion loss by dynamically adjusting impedance matching based on the frequency band, thereby improving antenna performance in multi-band devices.
Implementation Method 1
a matching circuit electrically connectable with the second filter, configured to optimize impedance matching between the antenna element and transceiver when operating in the second frequency band
Data Source
AI summary
Disclosed is an electronic device. The electronic device according to an embodiment includes an antenna element configured to receive a signal in at least one frequency band of a first frequency band and a second frequency band, a signal distributor electrically connected with the antenna element, and including a first filter corresponding to the first frequency band and a second filter corresponding to the second frequency band, a matching circuit electrically connectable with the second filter, a transceiver electrically connected with the signal distributor, a switch connecting the second filter with the matching circuit or the transceiver, and a processor electrically connected with the transceiver. Moreover, various embodiments found through the present disclosure are possible.