Antenna Impedance Control Circuit for Signal Isolation
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Solution Overview
Problem
The integration of wireless communication modules and proximity sensors in miniaturized electronic devices, such as notebook computers and smartphones, poses challenges in designing effective LTE antennas due to space constraints and potential interference between these components.
Innovation Solution
The implementation of impedance control circuits on the antenna radiator, which includes an impedance matching circuit and an inductor, allows for the blocking of RF signals from interfering with sensing signals, thereby reducing mutual influences and optimizing the transmission paths for both RF and sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If wireless communication module and proximity sensor share the antenna radiator, then space is effectively used, but negative influences are generated among the electronic elements
Solution Approach 1:
The patent divides the antenna system into separate functional segments: one for RF signal transmission (wireless communication) and another for sensing signal transmission (proximity detection). By using separate impedance control circuits and transmission paths for different signal types, the system eliminates mutual interference while maintaining shared use of the antenna radiator structure.
Solution Approach 2:
The patent introduces impedance control circuits as intermediary components between the antenna radiator and different electronic elements. These circuits act as mediators that selectively control signal transmission, allowing RF signals and sensing signals to share the antenna radiator without interfering with each other through proper impedance matching and signal isolation.
2Object-generated harmful factors
If impedance control circuits are disposed on the radiator, then RF signal and sensing signal transmission paths are separated, but device complexity increases
Solution Approach 1:
The patent designs impedance control circuits that serve multiple functions: they provide impedance matching for the antenna, enable selective signal transmission for both RF and sensing signals, and isolate different signal types. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity despite the added signal separation capability.
3Volume of moving object
If electronic products are miniaturized, then space is reduced, but it becomes difficult to design effective LTE antennas
Solution Approach 1:
The patent merges the LTE antenna design with the device frame structure, where the frame itself serves as part of the antenna radiator. This integration allows the antenna to be formed using existing structural components, simplifying the design process and reducing the need for separate antenna elements in miniaturized devices.
Solution Approach 2:
The patent utilizes the three-dimensional space within the device frame by extending antenna branch units along different spatial dimensions (first direction and second direction). This approach allows effective antenna design in limited planar space by exploiting vertical and lateral dimensions, enabling LTE functionality in miniaturized devices.
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 enables the design of antennas that effectively combine frequency bands for wireless communication while minimizing the impact of proximity sensors on the antenna apparatus, simplifying the overall antenna and circuit structure and reducing interference.
Implementation Method 1
The inductor is electrically connected to a second end of the impedance matching circuit, transmits the sensing signal, and blocks the RF signal
Implementation Method 2
the impedance matching circuit is configured to adjust impedance matching of the radiator and transmit a sensing signal
Implementation Method 3
A second end of the capacitor is grounded, and the capacitor blocks the sensing signal
Data Source
AI summary
An antenna apparatus and an electronic apparatus are provided. The electronic apparatus includes the antenna apparatus. The antenna apparatus includes a radiator, a first and a second impedance control circuit. The radiator receives and transmits a radio frequency (RF) signal. The first impedance control circuit is electrically connected to the radiator and transmits the RF signal. The second impedance control circuit includes an impedance matching circuit and an inductor. The first end of the impedance matching circuit is electrically connected to the radiator. The impedance matching circuit adjusts the impedance matching of the radiator and transmits a sensing signal. The inductor is electrically connected to the second end of the impedance matching circuit. The inductor transmits a sensing signal, and blocks the RF signal. Accordingly, the structures of the antenna and the circuit can be simplified, and the influence between the RF signal and the sensing signal can be reduced.