RF Antenna Cancellation Circuit for Isolation and Noise Reduction
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Solution Overview
Problem
Existing RF antenna systems face challenges in achieving ideal performance due to poor isolation between antennas and dependency on specific RF switches or diversity front-end modules, leading to vendor lock-in and degraded radio link performance.
Innovation Solution
The RF antenna system employs co-linearly arranged antennas with a cancelation circuit connected between their feeding points on a radio PCB, providing isolation from the base PCB and eliminating noise injection, allowing for independent performance and modular usage without vendor lock-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If orthogonally arranged F-type antennas are used in a diversity system, then antenna diversity is achieved, but isolation between antennas deteriorates
Solution Approach 1:
A cancelation circuit is introduced as an intermediary component between the two antenna elements. This circuit receives signals from both antennas and actively cancels the coupled signal from one antenna at the feed point of the other antenna, thereby maintaining isolation while preserving diversity functionality
Solution Approach 2:
The cancelation circuit performs preliminary anti-action by preemptively canceling the harmful coupled signal at the feed point before it can interfere with the reception process. This prevents the isolation problem from affecting system performance
2Volume of moving object
If antennas are placed close to base PCB, then device size is reduced, but noise injection from base PCB circuitry to antennas increases
Solution Approach 1:
The cancelation circuit serves as an intermediary that isolates the antenna elements from the base PCB. By actively canceling coupled signals at the feed points, it prevents noise from the base PCB circuitry from being injected into the antennas, enabling compact design without sacrificing signal quality
3Device complexity
If dependency on specific RF switch or diversity front-end module is accepted, then vendor lock-in occurs, but system complexity is reduced
Solution Approach 1:
The patent extracts the isolation function from proprietary RF switches or diversity front-end modules and implements it through a standalone cancelation circuit. This extraction enables vendor independence while maintaining system performance and avoiding lock-in to specific suppliers
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 configuration enhances Total Isotropic Sensitivity (TIS) characteristics and radio link performance by maintaining isolation between antennas and the base PCB, enabling a small, modular, and vendor-independent RF antenna system with improved isolation and reduced noise interference.
Implementation Method 1
a cancelation circuit located on the radio PCB and connected to feeding points of the first antenna element and the second antenna element via the radio PCB to provide a cancelation effect at output ports of the cancelation circuit with respect to signals broadcast by the first antenna element and the second antenna element over air
Data Source
AI summary
A radio frequency antenna system is provided and can include a radio printed circuit board, a first antenna element located proximate an edge of the radio printed circuit board, a second antenna element located proximate the edge of the radio printed circuit board, and a cancelation circuit located on the radio printed circuit board and connected to feeding points of the first antenna and the second antenna, wherein the cancelation circuit can provide a cancelation effect at output ports of the cancelation circuit with respect to signals broadcast by the first antenna element and the second antenna element over air.